AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 28, 2003


                                                     REGISTRATION NO. 333-106851
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                             ---------------------


                                AMENDMENT NO. 1


                                       TO


                                    FORM S-4
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                             ---------------------

                                   ALCAN INC.
             (Exact name of Registrant as specified in its charter)


                                                                            
                 CANADA                                    3334                                NOT APPLICABLE
    (State or other jurisdiction of            (Primary Standard Industrial         (I.R.S. Employer Identification No.)
             incorporation                            Classification
            or organization)                           Code Number)


                          1188 SHERBROOKE STREET WEST
                        MONTREAL, QUEBEC, CANADA H3A 3G2
                           TELEPHONE: (514) 848-8000
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)

                             ---------------------

                           ROY MILLINGTON, SECRETARY
                                   ALCAN INC.
                          1188 SHERBROOKE STREET WEST
                        MONTREAL, QUEBEC, CANADA H3A 3G2
                                 (514) 848-8000
(Name, address, including zip code and telephone number, including area code, of
                               agent for service)

                             ---------------------

                                   COPIES TO:


                                                          
                     DONALD R. CRAWSHAW                                            SCOTT D. MILLER
                  SULLIVAN & CROMWELL LLP                                      SULLIVAN & CROMWELL LLP
                      125 BROAD STREET                                          1870 EMBARCADERO ROAD
                  NEW YORK, NEW YORK 10004                                   PALO ALTO, CALIFORNIA 94303
                       (212) 558-4000                                               (650) 461-5600


                             ---------------------

    APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC:  As soon as
practicable after this Registration Statement becomes effective and all other
conditions to the consummation of the transaction described herein have been
satisfied or waived.

                             ---------------------

    If the securities being registered on this Form are being offered in
connection with the formation of a holding company and there is compliance with
General Instruction G, check the following box.  [ ]

    If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, check the following box and
list the Securities Act registration statement number of the earlier effective
registration statement for the same offering.  [ ]

    If this Form is a post-effective amendment filed pursuant to Rule 462(d)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering.  [ ]


    THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF
THE SECURITIES ACT OF 1933 OR UNTIL THIS REGISTRATION STATEMENT SHALL BECOME
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


THE INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IT IS
NOT SOLICITING AN OFFER TO BUY THESE SECURITIES, NOR SHALL THERE BE ANY SALE OF
THESE SECURITIES, IN ANY JURISDICTION IN WHICH SUCH OFFER, SOLICITATION OR SALE
IS NOT PERMITTED OR WOULD BE UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION
UNDER THE SECURITIES LAWS OF ANY SUCH JURISDICTION.

PROSPECTUS                                                U.S. OFFER TO EXCHANGE


                 SUBJECT TO COMPLETION. DATED AUGUST   , 2003.


                                  (ALCAN LOGO)

                   OFFER TO EXCHANGE PECHINEY COMMON SHARES,
                   PECHINEY BONUS ALLOCATION RIGHTS, PECHINEY
                OCEANES AND PECHINEY AMERICAN DEPOSITARY SHARES

We are offering to exchange:

    - 3 Alcan Common Shares and E123 in cash for every 5 Pechiney Common Shares;


    - 3 Alcan Common Shares and E123 in cash for every 50 Pechiney Bonus
      Allocation Rights (each Pechiney Bonus Allocation Right entitling the
      holder to 0.1 of a Pechiney Common Share);


    - E81.70 in cash for each Pechiney OCEANE (obligations a option de
      conversion en actions nouvelles et/ou d'echange en actions existantes);
      and

    - 3 Alcan Common Shares and E123 in cash for every 10 Pechiney American
      Depositary Shares, or Pechiney ADSs (each Pechiney ADS representing
      one-half of one Pechiney Common Share), tendered.


If you hold Pechiney securities (other than Pechiney OCEANEs), then, in lieu of
this mix of Alcan Common Shares and cash:



    - you may elect to receive 3 Alcan Common Shares for each 2 Pechiney Common
      Shares, each 20 Pechiney Bonus Allocation Rights or each 4 Pechiney ADSs
      that you tender; or



    - you may elect to receive E41 in cash for each Pechiney Common Share or
      each 2 Pechiney ADSs that you tender or E4.1 in cash for each Pechiney
      Bonus Allocation Right that you tender.



You are not required to make the same election for all of the Pechiney
securities that you tender, and you may make either of these elections for all
or some of the Pechiney securities that you tender. However, these elections are
subject to a proration and allocation procedure that will ensure that, in the
aggregate, 40% of the Pechiney Common Shares (including, for the purposes of
this calculation, the Pechiney Common Shares underlying the tendered Pechiney
Bonus Allocation Rights and Pechiney ADSs) tendered in this offer and the
concurrent French offer are exchanged for Alcan Common Shares and 60% are
exchanged for cash (excluding the effect of the treatment of fractional shares
that would otherwise be issued). See "The Offers--Terms of the Offers" on page
52.



THIS OFFER WILL EXPIRE AT         , NEW YORK CITY TIME ON         , 2003, UNLESS
IT IS EXTENDED OR UNLESS IT LAPSES OR IS WITHDRAWN PRIOR TO THAT TIME. YOU MAY
WITHDRAW ANY PECHINEY SECURITIES TENDERED AT ANY TIME PRIOR TO THE EXPIRATION.



Alcan is offering to acquire all of the outstanding Pechiney securities through
two separate offers:



    - a U.S. offer open to all holders of Pechiney securities (other than
      Pechiney ADSs) who are located in the United States and to all holders of
      Pechiney ADSs, wherever located, and



    - a French offer open to all holders of Pechiney securities (other than
      Pechiney ADSs) who are located in France and to holders of Pechiney
      securities (other than Pechiney ADSs) who are located outside of France
      and the United States if, pursuant to the local laws and regulations
      applicable to such holders, they are permitted to participate in the
      French offer.


These offers together are being made for all issued and outstanding Pechiney
securities, as well as for all Pechiney Common Shares that are held as treasury
stock and all Pechiney Common Shares that are or may become issuable prior to
the expiration of the offers due to the conversion of outstanding Pechiney
OCEANEs or the exercise of Pechiney stock options. The completion of the offers
is subject to certain conditions. For a discussion of the conditions, see "The
Offers -- Conditions Precedent." Subject to applicable law and regulation, we
reserve the right to modify or waive certain of these conditions in our
discretion.


Based on the number of Pechiney securities we understand (based on Pechiney's
Report on Form 6-K dated July 30, 2003) to be currently outstanding (including
Pechiney Common Shares issuable in exchange for Pechiney OCEANEs and upon the
exercise of outstanding Pechiney stock subscription options), Alcan will issue
up to 55,817,087 Alcan Common Shares pursuant to the offers, including up to
26,769,782 Alcan Common Shares pursuant to the U.S. offer.


Alcan Common Shares are listed on the New York Stock Exchange under the symbol
"AL", the Toronto Stock Exchange under the symbol "AL.TO", the London Stock
Exchange under the symbol "ALq.L" and the SWX Swiss Exchange under the symbol
"AL.S". Alcan will apply to list its Alcan Common Shares on Euronext Paris,
subject to the successful completion of the offers.

This prospectus contains detailed information concerning the U.S. offer for
Pechiney securities and the proposed combination of Alcan and Pechiney. We
recommend that you read this prospectus carefully.


The Dealer Manager for the U.S. offer is Morgan Stanley & Co. Incorporated.



FOR A DISCUSSION OF RISK FACTORS THAT YOU SHOULD CONSIDER IN EVALUATING THIS
OFFER, SEE "RISK FACTORS" BEGINNING ON PAGE 21.


NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES
COMMISSION HAS APPROVED OR DISAPPROVED OF THE SECURITIES TO BE ISSUED IN
CONNECTION WITH THIS OFFER OR HAS PASSED UPON THE ADEQUACY OR ACCURACY OF THE
DISCLOSURE IN THIS DOCUMENT. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL
OFFENSE IN THE UNITED STATES.

THIS PROSPECTUS HAS NOT RECEIVED THE VISA OF THE FRENCH COMMISSION DES
OPERATIONS DE BOURSE. ACCORDINGLY, THIS PROSPECTUS MAY NOT BE USED TO MAKE
OFFERS OR SALES IN FRANCE IN CONNECTION WITH THE OFFER DESCRIBED HEREIN.


                 THE DATE OF THIS PROSPECTUS IS         , 2003



                             CERTAIN DEFINED TERMS

Unless otherwise specified or if the context so requires:

     - References in this prospectus to "ALCAN," the "COMPANY," "WE," "US" or
       "OUR" refer to Alcan Inc., a Canadian corporation, and, where applicable,
       its consolidated subsidiaries.

     - References to "PECHINEY" refer to Pechiney, a French societe anonyme,
       and, where applicable, its consolidated subsidiaries.


     - References to "PECHINEY SECURITIES" refer collectively to the Pechiney
       Common Shares, Pechiney Bonus Allocation Rights, Pechiney OCEANEs and
       Pechiney ADSs.


                     INFORMATION INCORPORATED BY REFERENCE


This prospectus incorporates important business and financial information about
Alcan and Pechiney by reference and, as a result, this information is not
included in or delivered with this prospectus. Documents incorporated by
reference are available from us without charge. You may also obtain documents
incorporated by reference into this prospectus from the Securities Exchange
Commission Internet site at the URL (or "uniform resource locator")
http://www.sec.gov or by requesting them in writing or by telephone from the
information agent for these offers:


                             D.F. King & Co., Inc.


                                 48 Wall street


                            New York, New York 10005


                                   (212)  --



TO OBTAIN TIMELY DELIVERY OF THESE DOCUMENTS, YOU MUST REQUEST THEM NO LATER
THAN           , 2003. For a list of those documents that are incorporated by
reference into this prospectus, see "Additional Information for
Securityholders -- Incorporation of Certain Documents by Reference" on page 123.



In addition, you may obtain additional information on Alcan and Pechiney from
various public sources. For a list of such sources, please see "Additional
Information for Securityholders -- Incorporation of Certain Documents by
Reference" on page 123.



THIS PROSPECTUS IS NOT AN OFFER TO SELL SECURITIES AND IT IS NOT SOLICITING AN
OFFER TO BUY SECURITIES, NOR SHALL THERE BE ANY SALE OR PURCHASE OF SECURITIES
PURSUANT HERETO, IN ANY JURISDICTION IN WHICH SUCH OFFER, SOLICITATION OR SALE
IS NOT PERMITTED OR WOULD BE UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION
UNDER THE LAWS OF ANY SUCH JURISDICTION.



                               TABLE OF CONTENTS



                                                           
PRESENTATION OF CERTAIN FINANCIAL AND OTHER INFORMATION.....  iii
  Accounting Principles.....................................  iii
  Currencies................................................  iii
  No Internet Site is Part of This Prospectus...............  iii
  Pechiney Information......................................   iv
QUESTIONS AND ANSWERS ABOUT THE OFFERS......................    v
SUMMARY.....................................................    1
  Alcan.....................................................    1
  Pechiney..................................................    1
  Terms of the Offers.......................................    2
  Summary Selected Historical Consolidated Financial Data of
     Alcan..................................................   12
  Summary Selected Historical Consolidated Financial Data of
     Pechiney...............................................   14
  Selected Unaudited Pro Forma Combined Financial
     Information; Unaudited Pro Forma Combined
     Capitalization.........................................   16
  Comparative Per Share Market Information..................   18
  Summary Selected Comparative Historical and Pro Forma Per
     Share Data.............................................   19
RISK FACTORS................................................   21
CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING
  STATEMENTS................................................   30
THE OFFERS..................................................   31
  Reasons for the Offer.....................................   31
  History of Alcan and Background of the Offers; Past
     Contacts, Transactions, Negotiations and Agreements....   37
  Chronology of the Decision-Making Process for the
     Offers.................................................   38
  Financial Analysis of the Offers..........................   40
  Source and Amount of Funds................................   51
  Terms of the Offers.......................................   52
  Conditions Precedent......................................   61
  Grounds for Withdrawing the Offers........................   62
  Expiration Date; Publication of Results; Subsequent
     Offering Period........................................   62
  Subsequent Transactions; Delisting; Compulsory
     Acquisition............................................   63
  Effect of the Offers on the Market for Pechiney
     Securities.............................................   64
  Fractional Shares.........................................   64
  Procedures for Tendering Pechiney Securities..............   65
  Withdrawal Rights.........................................   69
  Acceptance and Return of Pechiney Securities..............   70
  Delivery of Alcan Common Shares and Cash; Settlement
     Date...................................................   70
  Fees and Expenses.........................................   71
  Listing of Alcan Common Shares............................   71
  Treatment of Pechiney Stock Options and Pechiney Employee
     Shareholding Plan......................................   72
  Future Dividend Policy of Pechiney........................   72
  Regulatory Approvals......................................   72
  Comparison of the Rights of Pechiney Shareholders and
     Alcan Shareholders.....................................   73
  Accounting Treatment......................................   73



                                        i



                                                           
TAXATION....................................................   74
  Tax Consequences of Exchanging Pechiney Securities........   75
  Tax Consequences of Owning and Disposing of Alcan Common
     Shares.................................................   78
  Backup Withholding and Information Reporting..............   80
INFORMATION ABOUT ALCAN.....................................   82
INFORMATION ABOUT PECHINEY..................................   83
PRO FORMA COMBINED FINANCIAL STATEMENTS OF ALCAN AND
  PECHINEY..................................................   85
REGULATORY MATTERS..........................................   95
DESCRIPTION OF ALCAN'S SHARE CAPITAL........................   99
  Outstanding Series of Share Capital.......................   99
  Description of Alcan Preference Shares....................   99
  Description of Alcan Common Shares........................  100
COMPARISON OF SHAREHOLDERS' RIGHTS..........................  101
ALCAN'S DIRECTORS AND EXECUTIVE OFFICERS....................  118
  Interests of Directors and Executive Officers of Alcan and
     Pechiney...............................................  118
  Additional Information Regarding Alcan's Directors and
     Executive Officers.....................................  118
MARKET PRICE AND DIVIDEND DATA..............................  119
  Market Prices.............................................  119
  Dividends.................................................  121
VALIDITY OF THE SECURITIES..................................  122
EXPERTS.....................................................  122
ADDITIONAL INFORMATION FOR SECURITYHOLDERS..................  123
  Where You Can Find More Information.......................  123
  Incorporation of Certain Documents by Reference...........  123
EXCHANGE RATE INFORMATION...................................  125
SERVICE OF PROCESS AND ENFORCEABILITY OF CIVIL LIABILITIES
  UNDER U.S. SECURITIES LAWS................................  126
WHO CAN HELP ANSWER MY QUESTIONS?...........................  126



                                        ii


            PRESENTATION OF CERTAIN FINANCIAL AND OTHER INFORMATION

                             ACCOUNTING PRINCIPLES

ALCAN


Alcan prepares its consolidated financial statements in conformity with Canadian
generally accepted accounting principles, which differ in certain significant
respects from generally accepted accounting principles in the United States,
commonly referred to as U.S. GAAP. Please see Note 7 to Alcan's audited
consolidated financial statements included in its Annual Report on Form 10-K for
the year ended December 31, 2002 (the "2002 10-K"), which is incorporated by
reference into this prospectus, and Note 5 to Alcan's unaudited financial
statements included in its Quarterly Report on Form 10-Q for the quarter ended
June 30, 2003 (the "2003 Second Quarter 10-Q"), which is also incorporated by
reference into this prospectus, for a description of the principal differences
between Canadian GAAP and U.S. GAAP as they relate to Alcan's consolidated
financial statements and for a reconciliation of certain relevant balance sheet
accounts, net income, comprehensive loss and accumulated other comprehensive
loss as of the dates and for the periods indicated.


PECHINEY


Pechiney prepares its consolidated financial statements in conformity with
generally accepted accounting principles in France, which differ in certain
significant respects from U.S. GAAP. Please see Note 25 to Pechiney's audited
consolidated financial statements included in its Annual Report on Form 20-F for
the year ended December 31, 2002 (the "2002 20-F"), which is incorporated by
reference into this prospectus, and the Appendix to the Second Quarter Results
2003 filed with the SEC on Form 6-K on July 30, 2003, which is also incorporated
by reference into this prospectus, for a description of the principal
differences between French GAAP and U.S. GAAP as they relate to Pechiney's
consolidated financial statements and for Pechiney's condensed U.S. GAAP
financial statements and a reconciliation of consolidated net income and
shareholders' equity for the periods indicated.


                                   CURRENCIES

In this prospectus, unless otherwise specified or the context otherwise
requires:


     - "$," "U.S. $" or "U.S. dollar" each refer to the United States dollar;


     - "E" or "euro" each refer to the euro, the single currency established for
       participants in the European Economic and Monetary Union, or the EMU,
       commencing January 1, 1999; and

     - "CAN $" refers to the Canadian dollar.


Alcan publishes its financial statements in U.S. dollars, and Pechiney publishes
its financial statements in euros. This prospectus contains translations of some
euro amounts into U.S. dollars. These amounts are provided solely for your
convenience. Unless otherwise indicated, translations of euro amounts into U.S.
dollars were made at the rate of E1.00 = $1.0893, which was the Federal Reserve
Bank of New York noon buying rate on August 26, 2003. See "Exchange Rate
Information" for additional information regarding the exchange rates between the
U.S. dollar and the euro.


                  NO INTERNET SITE IS PART OF THIS PROSPECTUS

Each of Alcan and Pechiney maintains an Internet site. The Alcan Internet site
is at the URL http://www.alcan.com. The Pechiney Internet site is at URL
http://www.pechiney.com. Information contained in or otherwise accessible
through these Internet sites is not a part of this prospectus. All references in
this prospectus to these Internet sites are inactive textual references to these
URLs and are for your information only.

                                       iii


                              PECHINEY INFORMATION

Alcan has included in this prospectus information concerning Pechiney known to
Alcan based on publicly available information (primarily filings by Pechiney
with the SEC and the French Commission des operations de bourse, or COB).
However, Alcan is not affiliated with Pechiney, and Pechiney has not granted
Alcan requested permission to have access to Pechiney's books and records or any
other non-public information regarding Pechiney. Therefore, non-public
information concerning Pechiney was not available to Alcan for the purpose of
preparing this prospectus. Publicly available information concerning Pechiney
may contain typographical or other errors. For example, the table on page 91 of
the 2002 20-F appears to contain an incorrect number for the line item of "net
cash used in investing activities" for the year ended December 31, 2002. Except
as discussed in the preceding sentences, Alcan has no knowledge that would
indicate that statements relating to Pechiney contained or incorporated by
reference in this prospectus are inaccurate or incomplete. However, Alcan was
not involved in the preparation of those statements and cannot verify them.

                                        iv


                     QUESTIONS AND ANSWERS ABOUT THE OFFERS


Q:  WHY IS ALCAN MAKING THESE OFFERS? (PAGE 31)



A:  The purpose of the offers is to enable Alcan to acquire all of the
    outstanding Pechiney securities. Alcan is pursuing its offers for Pechiney
    because of the significant value-creating opportunities the offers present
    to both Alcan and Pechiney shareholders. The transaction is intended to
    enable Alcan to build upon its position as one of the world's leading
    aluminum and packaging companies and to benefit from the combined entity's
    enhanced scale, financial strength and technological resources as well as
    its increased capability to serve customers worldwide. The combined entity
    will also benefit from a larger and more diversified low-cost global
    position in primary aluminum production with opportunities for profitable
    growth, an advanced aluminum fabricating business with facilities around the
    world and a leading position in flexible packaging. The addition of Pechiney
    will enhance Alcan's research and development and product and process
    development capabilities across all of its business sectors.



    Reflecting Alcan's significantly increased industrial presence in France,
    Alcan intends to locate the global headquarters of the combined entity's
    packaging business in Paris and has identified France as the headquarters
    for its European primary aluminum business and the combined entity's future
    global headquarters for new cell technology development in primary aluminum.
    Alcan is also considering the possibility of establishing the global
    headquarters of the combined entity's aerospace and engineered products
    group in France.


    Alcan believes that its enhanced size and scope as a result of its
    acquisition of Pechiney will enable it to capitalize on a greater variety of
    strategic options. Alcan intends to continue pursuing value-maximizing
    strategies consistent with its Value Based Management system through a
    careful analysis of the expanded opportunity set that Alcan will benefit
    from following the transaction.


    The reasons for the offers and combination are described in greater detail
    under "The Offers -- Reasons for the Offers" beginning on page 31.



Q:  WHAT WILL I RECEIVE IF THESE OFFERS ARE COMPLETED? (PAGE 52)



A:  If you tender Pechiney Common Shares, you will receive 3 Alcan Common Shares
    and E123 in cash for every 5 Pechiney Common Shares you tender. If you
    tender Pechiney Bonus Allocation Rights, you will receive 3 Alcan Common
    Shares and E123 in cash for every 50 Pechiney Bonus Allocation Rights you
    tender. If you tender Pechiney OCEANEs, you will receive E81.70 in cash for
    each Pechiney OCEANE you tender. If you tender Pechiney ADSs, you will
    receive 3 Alcan Common Shares and E123 in cash for every 10 Pechiney ADSs
    you tender. The value of the consideration offered for each Pechiney
    security is referred to as an "exchange ratio." The exchange ratios will not
    change even if the market price of Alcan Common Shares or any of Pechiney
    securities increases or decreases.



    If you hold Pechiney Common Shares, Pechiney Bonus Allocation Rights or
    Pechiney ADSs, then, in lieu of the above mix of Alcan Common Shares and
    cash, you may make the elections described in this paragraph with respect to
    the consideration you wish to receive. If you prefer to receive Alcan Common
    Shares, you may elect to receive 3 Alcan Common Shares for each 2 Pechiney
    Common Shares, each 20 Pechiney Bonus Allocation Rights or each 4 Pechiney
    ADSs that you tender. If you prefer to receive cash, you may elect to
    receive E41 in cash for each Pechiney Common Share or each 2 Pechiney ADSs
    that you tender or E4.1 in cash for each Pechiney Bonus Allocation Right
    that you tender. You are not required to make the same election for all of
    the Pechiney Common Shares, Pechiney Bonus Allocation Rights or Pechiney
    ADSs that you tender. However, these election options are subject to a
    proration and allocation procedure that will ensure that, in the aggregate,
    40% of the Pechiney Common Shares (including, for the purposes of this
    calculation, the Pechiney Common Shares underlying the tendered Pechiney
    Bonus Allocation Rights and Pechiney ADSs) tendered in this offer and the
    French offer are exchanged for Alcan Common Shares and 60% are exchanged for
    cash (excluding the effect of the treatment of fractional


                                        v



    shares that would otherwise be issued). For a complete description of the
    proration and allocation procedures see "The Offers -- Terms of the
    Offers -- Proration and Allocation Procedures" beginning on page 53.



    Settlement is currently expected to take place approximately 12 to 18 French
    trading days following the expiration date of the offers.



    No fractional Alcan Common Shares will be issued in connection with the
    offers. Alcan will aggregate the fractional Alcan Common Shares that would
    otherwise be issued to tendering holders of Alcan securities and arrange for
    them to be sold on the market. You will receive a pro rata portion of the
    net proceeds of this sale instead of any fractional Alcan Common Shares that
    would otherwise have been issued to you.



Q:  ARE THERE ANY CONDITIONS TO ALCAN'S OBLIGATION TO COMPLETE THESE OFFERS?
    (PAGE 61)



A:  Yes. Alcan's obligation to complete the offers is subject to the conditions
    set forth on page 61, including the condition that valid acceptances, that
    have not been withdrawn at the end of the offering period, in respect of
    Pechiney securities representing a majority of the total share capital and
    voting rights in Pechiney, calculated on a fully diluted basis, are tendered
    in this offer and in the French offer, on a combined basis. We may only
    waive this minimum tender condition on or prior to the date that is five
    French trading days prior to the expiration of the offer period. If this
    condition is not met the offers will lapse.



    In addition, the offers are conditional upon receipt of competition approval
    from the European Commission and, if the European Commission refers the
    offers to them (in whole or in part), from the competition authorities of
    any Member States of the European Union to whom such a reference is made.
    The offers are also conditional on termination or expiration of the waiting
    period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as
    amended. If the European Commission or the competition authorities of any
    applicable Member State of the European Union (as described above)
    determines that the transaction requires investigation that extends beyond
    the relevant initial period of investigation (i.e., enter into a "Phase II
    review") or if the U.S. Department of Justice or the Federal Trade
    Commission issues a second request for additional information (thereby
    extending the waiting period under the Hart-Scott-Rodino Antitrust
    Improvements Act of 1976, as amended), the offers will lapse.



    If the offers lapse because any of the conditions precedent are not met,
    Alcan reserves the right to commence a new offer, or not to commence a new
    offer, in its discretion. If the offers are withdrawn or lapse, the Pechiney
    securities that you tendered will be returned to you without interest or any
    other payment being due. This should occur within one or two French trading
    days following the announcement of the withdrawal or lapse.



Q:  WILL I KNOW WHETHER THE MINIMUM ACCEPTANCE CONDITION HAS BEEN SATISFIED
    BEFORE MY RIGHT TO WITHDRAW PECHINEY SECURITIES FROM THESE OFFERS EXPIRES?
    (PAGE 69)



A:  No, under the terms of the offers, your withdrawal rights extend only to the
    expiration date. The definitive results of the offers for Pechiney
    securities will not be known until approximately six to nine French trading
    days after the expiration date of the offer period.



Q:  WHEN DO THESE OFFERS EXPIRE? (PAGE 62)



A:  The offers will expire at       , New York City time, on       , 2003,
    unless they are extended by the French Conseil des Marches Financiers, or
    CMF, or unless they lapse or are withdrawn prior to that time on the basis
    of the conditions of the offers described in this prospectus. You must
    tender your Pechiney securities and deliver all required instructions and
    documents before the expiration date in order to accept this offer, unless
    following a successful offer Alcan elects to provide for a subsequent
    offering period, as described in the following answer.



Q:  MAY ALCAN EXTEND OR WITHDRAW THESE OFFERS OR CHANGE THEIR TERMS? (PAGE 62)


A:  The tender period for these offers has been established by the CMF, which
    solely determines whether or not to extend the offer period. Alcan may not
    itself extend the offer period. If the offer period is extended by the CMF,
    this offer will be likewise extended and

                                        vi


    you will have until the expiration of this offer, as so extended, to decide
    whether to tender.


    Pursuant to the laws and regulations applicable to the offers in France,
    Pechiney's home jurisdiction and the primary market for its securities,
    Alcan reserves the right to withdraw the offers (i) within five French
    trading days following the date of the publication by the CMF of the offer
    calendar for a competing offer for Pechiney or an improved bid by a
    competing bidder, or (ii) with the prior approval of the CMF if, during
    these offers, Pechiney adopts definitive measures that modify Pechiney's
    substance ("modifiant sa consistance") or if the offers become irrelevant
    ("sans effet") under French law. In addition, as mentioned above, if the
    conditions precedent of the offers are not satisfied, the offers will lapse.


    Alcan is not permitted to change the terms of the offers, except under
    certain conditions, such as the launch of a competing offer for Pechiney.

    Subject to these restrictions, and in accordance with applicable law and
    regulation, we reserve the right, at any time or from time to time, to
    terminate these offers or to amend their terms in any respect, although we
    do not currently intend to terminate these offers unless, in our reasonable
    judgment, the conditions precedent to completion set forth in this
    prospectus are not met.


    If, through these offers, we acquire at least two-thirds of Pechiney's total
    share capital and voting rights, or more than 50% if there is a concurrent
    competing offer, we may elect to provide a subsequent offering period of at
    least ten French trading days by issuing a press release publicizing this
    decision within ten French trading days following the publication of the
    definitive results of the offers. The CMF would then set and publish the
    calendar for such a subsequent offering period, which would ordinarily begin
    within a few days following the publication by the CMF of the subsequent
    offer calendar. We have not, however, yet made a final decision as to
    whether we will provide for a subsequent offering period if these tender
    conditions are met. We will provide the same consideration being offered
    during this initial offering period. Elections to receive all Alcan Common
    Shares or all cash in any subsequent offering period will be subject to the
    same proration and allocation procedures that apply to this initial offering
    period.



Q:  IF THE OFFERS FOR PECHINEY SECURITIES ARE SUCCESSFUL, WHAT WILL HAPPEN TO
    PECHINEY SECURITIES THAT WERE NOT TENDERED OR THAT WERE TENDERED BUT
    SUBSEQUENTLY WITHDRAWN? DOES ALCAN INTEND TO "SQUEEZE OUT" FOR CASH OR OTHER
    CONSIDERATION ANY PECHINEY SECURITIES THAT REMAIN OUTSTANDING FOLLOWING
    COMPLETION OF THE OFFERS? (PAGE 63)



A:  The purpose of the offers is to enable Alcan to acquire all of the
    outstanding Pechiney securities. If Alcan acquires less than all Pechiney
    securities pursuant to the offers, Alcan may exercise its statutory right,
    to the extent available, as described in the next paragraph, and all other
    means legally available to it, to acquire Pechiney securities not tendered.
    The Company has not determined whether and when it would seek to acquire any
    Pechiney securities not tendered into the offers and expects to make those
    determinations based on the circumstances existing at the appropriate time.
    Alcan may also engage in transactions with Pechiney to combine and integrate
    the two businesses. The financial strategies and dividend policies of
    Pechiney subsequent to a successful offer may differ from those that would
    be followed by Pechiney if it remained an independent company.



    If Alcan acquires at least 95% of the total voting rights in Pechiney, Alcan
    may launch, to the extent permitted by French law, a withdrawal offer or
    offers (offre publique de retrait), or "buy-out", which, if following the
    buy-out Alcan also holds at least 95% of the total share capital in
    Pechiney, may be followed by a compulsory acquisition (retrait obligatoire),
    or "squeeze-out", of the remaining Pechiney securities not held by Alcan.
    The consideration offered in any such withdrawal offer or compulsory
    acquisition may be different from the consideration offered in this offer.



Q:  WHAT WILL HAPPEN TO MY PECHINEY OCEANES OR PECHINEY BONUS ALLOCATION RIGHTS
    IF I DO NOT ACCEPT THIS OFFER? (PAGE 63)


A:  Any Pechiney OCEANEs that you do not tender in this offer will remain
    convertible into Pechiney Common Shares unless Pechiney is merged with, or
    absorbed by, another entity,
                                       vii


    which is not contemplated in connection with these offers.

    If Alcan acquires sufficient Pechiney Common Shares in the offers to cause
    their delisting, then, pursuant to the terms of the Pechiney OCEANEs, the
    holders of the Pechiney OCEANEs may require Pechiney to redeem the Pechiney
    OCEANEs for a make-whole payment.

    If Alcan acquires at least 95% of the total share capital and voting rights
    in Pechiney, Alcan may, as noted above, launch a buy-out and a squeeze-out
    of the remaining Pechiney securities not held by Alcan, including the
    Pechiney OCEANEs. Also, if less than 10% of the number of issued Pechiney
    OCEANEs remains outstanding following the consummation of these offers,
    Alcan may cause Pechiney to redeem the remaining outstanding Pechiney
    OCEANEs at the redemption price determined pursuant to the terms of the
    Pechiney OCEANEs. This redemption price may be lower than the consideration
    offered to holders of the Pechiney OCEANEs pursuant to these offers.


    Similarly, any Pechiney Bonus Allocation Rights that you do not tender in
    this offer will remain exchangeable for Pechiney common shares. If Alcan
    acquires at least 95% of the total share capital and voting rights in
    Pechiney, Alcan may decide to launch a buy-out and a squeeze-out of the
    remaining Pechiney securities not held by Alcan, including the Pechiney
    Bonus Allocation Rights.



Q:  WHAT WILL HAPPEN TO MY PECHINEY STOCK OPTIONS AND PECHINEY COMMON SHARES
    HELD IN MY PECHINEY EMPLOYEE SHAREHOLDING PLAN ACCOUNT IF THESE OFFERS ARE
    SUCCESSFUL? (PAGE 72)



A:  Alcan has not had access to important information relating to Pechiney's
    stock option plans and employee shareholding plans, including the terms of
    these plans. If these offers are consummated, Alcan will determine the
    treatment of stock options (including stock purchase options and stock
    subscription options) and of Pechiney Common Shares held in the Pechiney
    employee shareholding plan that could not be tendered. The treatment that
    Alcan may offer is described under "The Offers -- Treatment of Pechiney
    Stock Purchase Options and Pechiney Stock Subscription Options" and "The
    Offers -- Treatment of Pechiney's Employee Shareholding Plan."



Q:  IF ALCAN ACQUIRES ALL THE PECHINEY SECURITIES IN THESE OFFERS, WHAT
    PERCENTAGE OF ALCAN WILL BE OWNED BY FORMER HOLDERS OF PECHINEY SECURITIES?
    (PAGE 61)



A:  Assuming acceptance in full of Alcan's offers for the Pechiney securities,
    the former holders of Pechiney securities would own approximately 14.8% of
    Alcan's outstanding Common Shares, on a fully diluted basis, immediately
    after the offers.


    After completion of these offers, you will hold securities of a company
    larger than Pechiney. Accordingly, you will have lower ownership and voting
    percentages of Alcan than you now have in Pechiney.


Q:  WILL I RECEIVE MY 2003 DIVIDENDS OR INTEREST, OR DIVIDENDS OR INTEREST WITH
    RESPECT TO LATER PERIODS, ON MY PECHINEY SECURITIES? (PAGE 72)



A:  You will retain the dividend or interest rights associated with your
    Pechiney securities after you tender them and, in any case, until we accept
    them pursuant to this offer. Once the settlement of the offers has taken
    place, we will become the owner of your Pechiney securities and will acquire
    all rights associated with those securities. Pechiney has already paid its
    declared dividend for the fiscal year ended December 31, 2002. If any
    dividends are declared on the Pechiney Common Shares or Pechiney ADSs
    tendered in these offers before the date on which we acquire ownership, the
    registered holder of those securities as of the record date specified or
    applicable in connection with such dividend declaration will receive the
    dividends. If any interest becomes payable on the Pechiney OCEANEs tendered
    in this offer before the date on which we acquire ownership, the registered
    holder of those securities as of the record date specified in accordance
    with such interest payment obligation will receive the interest.



Q:  WILL I RECEIVE DIVIDENDS ON THE ALCAN SHARES I RECEIVE IN CONNECTION WITH
    THIS OFFER? (PAGE 37)


A:  The new Alcan Common Shares issued in connection with this offer will have
    the same dividend and other rights as our other Common

                                       viii



    Shares. If any dividends are declared on the Alcan Common Shares before the
    date on which you acquire ownership pursuant to this offer, you will not be
    entitled to receive those dividends. In recent years, when Alcan has
    declared a quarterly dividend for the fourth quarter of a fiscal year, such
    dividend has been paid on or about December 20 to holders of record on a
    date established to be on or about November 20 of that year. See "Market
    Price and Dividend Data -- Dividends."



Q:  WHAT IS ALCAN'S EXPECTED DIVIDEND POLICY AFTER THE OFFERS? (PAGE 37)


A:  Alcan currently expects to continue to pursue a policy of paying quarterly
    dividends on the Alcan Common Shares. The amount of such future dividends
    will be determined by Alcan's board of directors in light of Alcan's
    earnings from operations, capital requirements and financial condition.

    Dividends paid on Alcan Common Shares held by non-residents of Canada will
    generally be subject to Canadian withholding tax which is levied at the
    basic rate of 25%, although this rate may be reduced depending on the terms
    of any applicable tax treaty. For residents of the U.S. or France, the
    treaty-reduced rate is currently 15%.


Q:  WILL I BE SUBJECT TO TAX AS A CONSEQUENCE OF EXCHANGING MY PECHINEY
    SECURITIES FOR ALCAN COMMON SHARES, FOR CASH OR FOR A COMBINATION OF BOTH?
    (PAGE 74)



A:  If you are a non-resident of France for French tax purposes, you will not be
    subject to French tax on any capital gain or loss that you recognize upon
    exchanging your Pechiney securities, unless you have a permanent
    establishment or fixed base in France and the Pechiney securities exchanged
    are part of the business property of that permanent establishment or fixed
    base.


    If you are a non-Canadian holder (as defined in "Taxation" below), then you
    will not be subject to Canadian federal tax on any gain that you realize
    upon exchanging your Pechiney securities for Alcan Common Shares, cash or a
    combination of both.


    If you are a U.S. holder (as defined in "Taxation" below), you will be
    subject to United States federal income tax on the gain or loss, if any,
    that you recognize upon exchanging your Pechiney securities for Alcan Common
    Shares, cash or a combination of both. If you are a non-U.S. holder (also as
    defined in "Taxation" below), you generally will be subject to United States
    federal income tax only in very limited circumstances.



    For detailed information on the French, Canadian and United States federal
    income tax consequences of exchanging your Pechiney securities and of
    holding Alcan Common Shares, see "Taxation" beginning on page 74.



Q:  WHAT WILL BE THE ACCOUNTING TREATMENT OF THE OFFERS? (PAGE 73)



A:  The acquisition of the Pechiney securities will be accounted for using the
    purchase method under both Canadian and U.S. GAAP. The unaudited pro forma
    combined financial information set forth in this prospectus has been
    prepared to demonstrate the possible outcome under U.S. GAAP. For a more
    detailed description of the accounting treatment, please see "The
    Offers -- Accounting Treatment" on page 73.



Q:  I HOLD CERTIFICATES FOR PECHINEY ADSs. HOW DO I ACCEPT THIS OFFER? (PAGE 66)


A:  If you hold certificates for Pechiney ADSs, complete and sign the letter of
    transmittal and send it, together with your American depositary share
    certificates and any other required documents, to the U.S. exchange agent
    before the expiration of this offer. If your certificates are not available,
    you may also follow guaranteed delivery procedures described in this
    prospectus. Do not send your certificates to Alcan, the dealer manager or
    the information agent.


Q:  I HOLD PECHINEY ADSs IN BOOK-ENTRY FORM. HOW DO I ACCEPT THIS OFFER? (PAGE
    66)


A:  If you hold Pechiney ADSs in book-entry form, complete the confirmation of a
    book-entry transfer of your Pechiney ADSs into the U.S. exchange agent's
    account at The Depository Trust Company, commonly known as DTC, and send
    either an agent's message or a letter of transmittal and any other required
    documents to the U.S. exchange agent before the expiration of this offer.

                                        ix



Q:  I HOLD PECHINEY COMMON SHARES, PECHINEY BONUS ALLOCATION RIGHTS OR PECHINEY
    OCEANEs THROUGH A U.S. CUSTODIAN, SUCH AS A BROKER, BANK OR TRUST COMPANY.
    HOW DO I ACCEPT THIS OFFER? (PAGES 67, 68)


A:  If you hold Pechiney Common Shares, Pechiney Bonus Allocation Rights or
    Pechiney OCEANEs through a U.S. custodian, you do not need to complete the
    letter of transmittal. Instead, your U.S. custodian should either forward to
    you the transmittal materials and instructions sent by the French financial
    intermediary that holds the shares on behalf of the U.S. custodian as record
    owner or send you a separate form prepared by the U.S. custodian. If you
    have not yet received instructions from your U.S. custodian, please contact
    your U.S. custodian directly. If your Pechiney securities are held in pure
    registered form (nominatif pur), you will first have to request that your
    shares be converted to administered registered form (nominatif administre).


Q:  I HOLD PECHINEY COMMON SHARES, PECHINEY BONUS ALLOCATION RIGHTS OR PECHINEY
    OCEANEs THROUGH A FRENCH FINANCIAL INTERMEDIARY. HOW DO I ACCEPT THIS OFFER?
    (PAGES 67, 68)



A:  If your Pechiney Common Shares, Pechiney Bonus Allocation Rights or Pechiney
    OCEANEs are held through a French financial intermediary, you do not need to
    complete the letter of transmittal. Instead, your French financial
    intermediary should send you transmittal materials and instructions for
    accepting this offer before the last day of the acceptance period. If you
    have not yet received instructions from your French financial intermediary,
    please contact your French financial intermediary directly. If your Pechiney
    Common Shares are held in pure registered form (nominatif pur), you will
    first have to request that your shares be converted to administered
    registered form (nominatif administre).



Q:  WILL I HAVE TO PAY ANY BROKERAGE COMMISSIONS OR TRANSACTION FEES? (PAGE 71)


A:  Alcan will pay the brokerage fees and related value added taxes incurred by
    Pechiney securityholders tendering into this offer, up to a limit of 0.3% of
    the value of each Pechiney security tendered, and subject to a maximum
    amount of E150 per account. Pechiney securityholders will not be reimbursed
    for any brokerage fees in any event that the offer is withdrawn or lapses.
    Financial intermediaries will be paid a fee, net of tax, of E0.50 per
    Pechiney Common Share tendered into this offer, up to a maximum amount of
    E200 per account. This fee will not be paid in the event that the offer is
    withdrawn or lapses. For more information regarding brokerage commissions
    and fees, see "The Offers -- Fees and Expenses."


Q:  WHAT HAPPENS IF I CHANGE MY MIND AFTER I TENDER MY PECHINEY SECURITIES?
    (PAGE 69)


A:  You may withdraw your tender of Pechiney securities by providing the
    exchange agent with written notice of your withdrawal at any time before the
    expiration date, which has initially been set as       , New York City time,
    on       , 2003, unless extended. If the expiration date is extended you may
    also withdraw your securities during the extension period. If you change
    your mind again, you can retender your securities by following the tender
    procedures again before this offer expires.


    If a subsequent offering period is provided, you may withdraw any Pechiney
    securities tendered during that subsequent period at any time prior to its
    expiration.



Q:  DO I NEED TO DO ANYTHING IF I WANT TO RETAIN MY PECHINEY SECURITIES? (PAGE
    65)


A:  No. If you want to retain your Pechiney securities, you do not need to take
    any action.


Q:  WHAT HAPPENS IF THE OFFERS LAPSE, ARE WITHDRAWN OR ARE NOT SUCCESSFUL? (PAGE
    62)



A:  If the offers for Pechiney securities lapse, are withdrawn or are not
    successful, your Pechiney securities will be returned to you without
    interest or any other payment being due. This should occur within one to two
    French trading days following (i) the announcement of the lapse or
    withdrawal, or (ii) the publication by the CMF of the results of the Offers,
    as the case may be.



Q:  WHEN WILL I KNOW THE OUTCOME OF THE OFFERS? (PAGE 62)


A:  The CMF should publish the results of the offers for Pechiney securities on
    a preliminary

                                        x



    basis six or seven French trading days after the expiration date and on a
    definitive basis not more than nine French trading days after the expiration
    date of the offers. Alcan will issue a press release regarding the results
    of the offers promptly after each announcement by the CMF. We will file
    those press releases with the SEC.



Q:  WHO CAN HELP ANSWER MY QUESTIONS? (PAGE 11)



A:  If you have more questions about this offer, you should contact the
    information agent:


    D. F. King & Co., Inc.
    toll-free number    --


                                        xi


                                    SUMMARY

To understand this offer and the businesses of Alcan and Pechiney more fully,
you should read carefully this entire prospectus and any documents incorporated
by reference into this prospectus, including the "Cautionary Statement
Concerning Forward-Looking Statements," "Risk Factors," Alcan's consolidated
financial statements and notes thereto incorporated by reference into this
prospectus, and Pechiney's consolidated financial statements and notes thereto
incorporated by reference into this prospectus.


                                               
                   ALCAN                                            PECHINEY

We are a Canadian corporation and the parent      Pechiney operates in two core businesses:
company of an international group operating       the production of primary aluminum and
in many aspects of the aluminum and               fabricated aluminum products and the
specialty packaging businesses. Our               production of packaging materials.
operations include:
                                                  ALUMINUM:  Pechiney's aluminum business is
    - the mining and processing of bauxite,       comprised of two segments: Primary Aluminum
      the basic aluminum ore;                     Metal and Aluminum Conversion. Aluminum Con-
                                                  version includes the activities of four
    - the refining of bauxite into alumina;       divisions, which include activities
                                                  organized around industrial or commercial
    - the generation of electricity for use       goals shared in common:
      in smelting aluminum;
                                                      - The Aerospace, Transport, Industry
    - the smelting of aluminum from alumina;      division;
    - the recycling of process and                    - The Cans, Automotive, Standard Rolled
      post-consumer aluminum;                     Products division;
    - the fabrication of aluminum, aluminum           - The Foil and Thin Foil/Specialty
      alloys and non-aluminum materials into      Products division; and
      semi-finished and finished products;
                                                      - The Extrusions, Casting Alloys,
    - the fabrication of aluminum and             Automotive division.
      non-aluminum engineered products;
                                                  PACKAGING:  Pechiney's Packaging sector
    - the production and conversion of            includes the following activities:
      specialty packaging and packaging
      products for many industries including          - Plastic Packaging;
the food, pharmaceutical, cosmetic, per-
sonal care and tobacco sectors;                       - Cebal Tubes Europe and Cebal Tubes
                                                  Americas;
    - the distribution and marketing of
      aluminum and packaging products; and            - Cebal Aerosols;
    - in connection with our alumina                  - Techpack International (TPI); and
      operations, the production and sale of
industrial chemicals.                                 - Pechiney Capsules.
We have a network of operations in 42             OTHER ACTIVITIES:  Pechiney's other business
countries with approximately 54,000               also includes Ferroalloys and International
dedicated employees, a global customer base,      Trade, where Pechiney operates the following
innovative products and advanced                  three lines of business: a worldwide network
technologies.                                     of sales agencies, which markets products
                                                  manufactured by Pechiney and third parties;
For additional information about us, see          a non-ferrous metal and other basic material
"-- Summary Selected Historical Consolidated      trading operation; and the distribution of
Financial Data of Alcan" below and the Alcan      semi-finished aluminum products.
documents incorporated by reference into
this prospectus.                                  For additional information about Pechiney,
                                                  see "-- Summary Selected Historical
Our principal executive offices are located       Consolidated Financial Data of Pechiney"
at 1188 Sherbrooke Street West, Montreal,         below and the Pechiney documents
Quebec, Canada H3A 3G2, and our telephone         incorporated by reference into this
number is 514-848-8000.                           prospectus.


                                        1


                                               
                                                  Pechiney's principal offices are located at
                                                  7, Place du Chancelier Adenauer, 75116
                                                  Paris, France, and its telephone number is
                                                  33-1-5628-2000.


                              TERMS OF THE OFFERS


CONSIDERATION.................   Upon the terms and subject to the conditions
                                 set forth in this prospectus and the related
                                 letter of transmittal and forms of acceptance,
                                 we are offering to exchange:


                                      - 3 Alcan Common Shares and E123 in cash
                                        for every 5 Pechiney Common Shares;


                                      - 3 Alcan Common Shares and E123 in cash
                                        for every 50 Pechiney Bonus Allocation
                                        Rights (each Pechiney Bonus Allocation
                                        Right entitling the holder to 0.1 of a
                                        Pechiney Common Share);


                                      - E81.70 in cash for each Pechiney OCEANE;
                                        and

                                      - 3 Alcan Common Shares and E123 in cash
                                        for every 10 Pechiney ADSs (each
                                        Pechiney ADS representing one-half of
                                        one Pechiney Common Share) tendered.

                                 If you hold Pechiney Common Shares, Pechiney
                                 Bonus Allocation Rights or Pechiney ADSs, then,
                                 in lieu of this mix of Alcan Common Shares and
                                 cash, you may make the following elections with
                                 respect to the consideration you wish to
                                 receive:

                                      - You may elect to receive 3 Alcan Common
                                        Shares for each 2 Pechiney Common
                                        Shares, each 20 Pechiney Bonus
                                        Allocation Rights or each 4 Pechiney
                                        ADSs that you tender; or


                                      - You may elect to receive E41 in cash for
                                        each Pechiney Common Share or each 2
                                        Pechiney ADSs that you tender or E4.1 in
                                        cash for each Pechiney Bonus Allocation
                                        Right that you tender.



                                 You are not required to make the same election
                                 for all of the Pechiney Common Shares, Pechiney
                                 Bonus Allocation Rights or Pechiney ADSs that
                                 you tender, and you may make any of these
                                 elections for all or some of the Pechiney
                                 Common Shares, Pechiney Bonus Allocation Rights
                                 or Pechiney ADSs that you tender. However,
                                 these election options are subject to a
                                 proration and allocation procedure that will
                                 ensure that, in the aggregate, 40% of the
                                 Pechiney Common Shares (including, for the
                                 purposes of this calculation, the Pechiney
                                 Common Shares underlying the tendered Pechiney
                                 Bonus Allocation Rights and Pechiney ADSs)
                                 tendered in this offer and the French offer are
                                 exchanged for Alcan Common Shares and 60% are
                                 exchanged for cash (excluding the effect of the
                                 treatment of fractional shares that would
                                 otherwise be issued). See "The Offers -- Terms
                                 of the Offers" on page 52. If


                                        2



                                 holders of such Pechiney securities elect to
                                 receive cash in exchange for more than 60% of
                                 the tendered Pechiney Common Shares (including
                                 Pechiney Common Shares underlying the tendered
                                 Pechiney Bonus Allocation Rights and Pechiney
                                 ADSs), the amount of cash that will be paid for
                                 each Pechiney Common Share, Pechiney Bonus
                                 Allocation Right and Pechiney ADS will be
                                 reduced pro rata for each holder of such
                                 Pechiney securities (treating each 10 Pechiney
                                 Bonus Allocation Rights and each 2 Pechiney
                                 ADSs as equivalent to one Pechiney Common
                                 Share). If holders of Pechiney securities elect
                                 to receive Alcan Common Shares in exchange for
                                 more than 40% of the tendered Pechiney Common
                                 Shares (including Pechiney Common Shares
                                 underlying the tendered Pechiney Bonus
                                 Allocation Rights and Pechiney ADSs), the
                                 number of Alcan Common Shares that will be
                                 issued in exchange for each Pechiney Common
                                 Share, Pechiney Bonus Allocation Right and
                                 Pechiney ADS will be reduced pro rata for each
                                 holder of such Pechiney securities (treating
                                 each 10 Pechiney Bonus Allocation Rights and
                                 each 2 Pechiney ADSs as equivalent to one
                                 Pechiney Common Share). This adjustment
                                 procedure is described under "The
                                 Offers -- Terms of the Offers -- Proration and
                                 Allocation Procedures" beginning on page 53. If
                                 you make no election, you will receive the mix
                                 of Alcan Common Shares and cash described in
                                 the first paragraph above in exchange for all
                                 the Pechiney securities that you tender.



                                 For legal and regulatory reasons, Alcan is
                                 offering to acquire all of the Pechiney
                                 securities through two separate offers:



                                 -- a U.S. offer open to all holders of Pechiney
                                    securities (other than Pechiney ADSs) who
                                    are located in the United States and to all
                                    holders of Pechiney ADSs, wherever located,
                                    and



                                 -- a French offer open to all holders of
                                    Pechiney securities (other than Pechiney
                                    ADSs) who are located in France and to
                                    holders of Pechiney securities (other than
                                    Pechiney ADSs) who are located outside of
                                    France and the United States if, pursuant to
                                    the local laws and regulations applicable to
                                    such holders, they are permitted to
                                    participate in the French offer.


                                 The U.S. and French offers for Pechiney
                                 securities are being made at the same time and
                                 on the same terms and completion of the offers
                                 are subject to the same conditions. This
                                 prospectus covers only Alcan's U.S. offer for
                                 Pechiney securities.


                                 The U.S. offer will begin on       , 2003 and
                                 end at       , New York City time (or
                                 Central European time), on       , 2003, unless
                                 it is extended or it lapses or is withdrawn
                                 prior to that time on the basis of the
                                 conditions of the offers as described in this
                                 prospectus. The French Conseil des Marches
                                 Financiers, or CMF, may decide to extend the
                                 offer period under certain circumstances,
                                 including in the event of the initiation of a
                                 competing offer, in which case the U.S. offer
                                 period will be likewise extended. You must
                                 tender your Pechiney securities before the
                                 expiration of the U.S. offer to participate.


                                        3



                                 If all of the Pechiney securities are tendered
                                 and exchanged pursuant to the terms of these
                                 offers, the current holders of Pechiney
                                 securities will own approximately 14.8% of
                                 Alcan's outstanding Common Shares, on a fully
                                 diluted basis, immediately after the exchange
                                 and the current Alcan shareholders will own
                                 approximately 85.2% of Alcan's outstanding
                                 Common Shares, on a fully diluted basis,
                                 immediately after the exchange.


CONDITIONS PRECEDENT..........   The offers are subject to the following
                                 conditions precedent:


                                      - Valid acceptances, that have not been
                                        withdrawn at the end of the offering
                                        period, in respect of Pechiney
                                        securities representing a majority of
                                        the total share capital and voting
                                        rights in Pechiney, calculated on a
                                        fully diluted basis, are tendered in
                                        this offer and the French offer, on a
                                        combined basis. For the purpose of
                                        calculating whether this threshold has
                                        been met, the numerator will include all
                                        the Pechiney securities tendered in this
                                        offer and the French offer, on a
                                        combined basis, including all (i)
                                        Pechiney Common Shares tendered and
                                        Pechiney ADSs tendered (each Pechiney
                                        ADS representing one-half of one
                                        Pechiney Common Share), (ii) Pechiney
                                        Common Shares underlying all tendered
                                        Pechiney OCEANEs (taking into account
                                        the number of Pechiney Common Shares
                                        into which the tendered Pechiney OCEANEs
                                        could be converted on the expiration
                                        date of the offers), and (iii) Pechiney
                                        Common Shares underlying all tendered
                                        Pechiney Bonus Allocation Rights (each
                                        Pechiney Bonus Allocation Right
                                        entitling the holder to 0.1 of a
                                        Pechiney Common Share). The denominator
                                        for this calculation will be comprised
                                        of Pechiney's fully diluted share
                                        capital, including all:


                                        - issued and outstanding Pechiney Common
                                          Shares and treasury stock held by
                                          Pechiney;

                                        - Pechiney ADSs (each Pechiney ADS
                                          representing one-half of one Pechiney
                                          Common Share); and

                                        - Pechiney Common Shares underlying
                                          Pechiney OCEANEs, Pechiney Bonus
                                          Allocation Rights, and all outstanding
                                          Pechiney stock subscription options
                                          (whether or not exercisable during the
                                          offer period).


                                        Under French law and regulations, a
                                        waiver of the minimum tender condition
                                        is deemed an improved offer and Alcan
                                        may only file an improved offer with the
                                        CMF on or prior to the date that is five
                                        French trading days prior to the
                                        expiration of the offer period. If this
                                        condition is not met the offers will
                                        lapse. Neither Alcan nor Pechiney
                                        securityholders will know whether the
                                        minimum tender condition has been met
                                        until the results of the offers are
                                        published by the CMF following the
                                        expiration of the tender offer period.



                                      - The offers are also conditional upon
                                        receipt of competition approval from the
                                        European Commission under European Union
                                        merger control legislation. In certain
                                        limited


                                        4



                                       circumstances, following a request from a
                                       Member State of the European Union, the
                                       European Commission may refer the offer
                                       to the national competition authority of
                                       that Member State to review all or part
                                       of the transaction. To the extent that
                                       jurisdiction to review all or a part of
                                       the transaction is referred by the
                                       European Commission to the national
                                       competition authorities of any Member
                                       States of the European Union ("Relevant
                                       National Authorities"), the transaction
                                       is subject to receipt of approval from
                                       those Relevant National Authorities. The
                                       offers are also conditional on
                                       termination or expiration of the waiting
                                       period under the Hart-Scott-Rodino
                                       Antitrust Improvements Act of 1976, as
                                       amended. If the European Commission or
                                       any Relevant National Authority
                                       determines that the transaction requires
                                       investigation that extends beyond the
                                       relevant initial period of investigation
                                       (i.e., enter into a "Phase II review") or
                                       if the U.S. Department of Justice or the
                                       Federal Trade Commission issues a second
                                       request for additional information
                                       (thereby extending the waiting period
                                       under the Hart-Scott-Rodino Antitrust
                                       Improvements Act of 1976, as amended),
                                       the offers will lapse. The satisfaction
                                       of this competition condition will be
                                       determined on or prior to the expiration
                                       date of the offers. Furthermore, the
                                       offers cannot close until the transaction
                                       has been approved by the European
                                       Commission and the Relevant National
                                       Authorities, if any, and until the
                                       waiting period under the
                                       Hart-Scott-Rodino Antitrust Improvements
                                       Act of 1976, as amended, has been
                                       terminated or expired without any action
                                       being commenced in any U.S. court seeking
                                       to prohibit the offers.


                                 If the offers lapse because any of the
                                 conditions precedent are not met, Alcan
                                 reserves the right to commence a new offer, or
                                 not to commence a new offer, in its discretion.


                                 If the offers are withdrawn or lapse, the
                                 Pechiney securities that you tendered in this
                                 offer will be returned to you without interest
                                 or any other payment being due. This should
                                 occur within one to two French trading days
                                 following the announcement of the lapse or
                                 withdrawal.


GROUNDS FOR WITHDRAWING THE
OFFERS........................   In accordance with French law and regulation,
                                 Alcan reserves the right to withdraw the
                                 offers:


                                      - within five French trading days
                                        following the date of the publication by
                                        the CMF of the offer calendar for a
                                        competing offer for Pechiney or an
                                        improved bid by a competing bidder; or



                                      - with the prior approval of the CMF if,
                                        during the exercise period of these
                                        offers, Pechiney adopts definitive
                                        measures that modify Pechiney's
                                        substance ("modifiant sa consistance")
                                        or if the offers become irrelevant
                                        ("sans objet") under French law.


                                        5


                                 In addition, as mentioned above, if the
                                 conditions precedent of the offers, including
                                 the tender threshold and the clearance from
                                 competition and antitrust authorities in Europe
                                 and the United States, are not satisfied, the
                                 offers will lapse.


                                 Under French law, if, during the period of
                                 these offers, another offer for Pechiney, or an
                                 improved bid by a competing bidder, is approved
                                 by the CMF, your tenders of Pechiney securities
                                 may be declared null and void by the CMF. In
                                 this event, in order to tender your Pechiney
                                 securities in this offer, if it remains
                                 outstanding, you will be required to re-tender
                                 your Pechiney securities.



                                 If the offers are withdrawn or lapse, the
                                 Pechiney securities that you tendered in this
                                 offer will be returned to you without interest
                                 or any other payment being due. This should
                                 occur within one to two French trading days
                                 following the announcement of the lapse or
                                 withdrawal.



                                 The word "lapse" in this context (referring to
                                 the time prior to the expiration of the offer
                                 period) refers to the termination of the offers
                                 pursuant to the General Regulations of the CMF
                                 in the event that the offers' stated
                                 competition and antitrust clearance conditions
                                 are not satisfied.


EXPIRATION DATE; SUBSEQUENT
OFFERING PERIOD...............   The tender period for this offer has been
                                 established by the CMF, which solely determines
                                 whether or not to extend the offer period.
                                 Alcan may not itself extend the offer period.


                                 This offer will expire at   , New York City
                                 time (or   , Central European time) on       ,
                                 2003, unless the offer period is extended, or
                                 unless the offer lapses or is withdrawn prior
                                 to that time. We expect the definitive results
                                 of the offers to be published by the CMF
                                 approximately six to nine French trading days
                                 following the expiration date of the offer
                                 period; however, upon its determination that
                                 the minimum tender condition for the offers has
                                 been satisfied, the CMF will publish
                                 provisional results prior to its publication of
                                 the definitive results. The CMF may decide to
                                 extend the initial offer period under certain
                                 circumstances, including in the event of the
                                 initiation of a competing offer, and it may
                                 permit Alcan to open a subsequent offer period,
                                 as described further in the next paragraph. Any
                                 such extended or subsequent offer period would
                                 apply likewise to this U.S. offer.



                                 If, through these offers, we acquire at least
                                 two-thirds of Pechiney's total share capital
                                 and voting rights, or more than 50% if there is
                                 a concurrent competing offer, we may elect to
                                 provide a subsequent offering period of at
                                 least ten French trading days by issuing a
                                 press release publicizing this decision within
                                 ten French trading days following the
                                 publication of the definitive results of the
                                 offers. The CMF would then set and publish the
                                 calendar for such a subsequent offering period,
                                 which would ordinarily begin within a few days
                                 following the publication by the CMF of the
                                 subsequent offer calendar. We have not,
                                 however, yet made a final decision as to
                                 whether we will provide a subsequent offering
                                 period if the two-thirds (or 50%, as the case
                                 may be) tendered threshold is met. In

                                        6



                                 any such subsequent offering period we will
                                 offer the same consideration being offered
                                 during this initial offering period. Elections
                                 to receive all Alcan Common Shares or all cash
                                 in any subsequent offering period will be
                                 subject to the same proration and allocation
                                 procedures that apply to this initial offering
                                 period, to ensure that 40% of the Pechiney
                                 Common Shares (including Pechiney Common Shares
                                 underlying the Pechiney Bonus Allocation Rights
                                 and Pechiney ADSs) tendered in the subsequent
                                 offering period are exchanged for Alcan Common
                                 Shares and 60% are exchanged for cash. Due to
                                 the application of the proration and allocation
                                 procedures to a separate pool of tendered
                                 Pechiney securities in the subsequent offering
                                 period, holders of Pechiney securities making
                                 the same elections in the initial offering
                                 period and any subsequent offering period may
                                 not receive the same mix of Alcan Common Shares
                                 and cash.



COMPULSORY ACQUISITION........   If Alcan acquires Pechiney securities
                                 representing at least 95% of the total voting
                                 rights in Pechiney, Alcan may launch, subject
                                 to applicable law and obtaining the requisite
                                 approvals, including the approval by the CMF, a
                                 withdrawal offer or offers (offre publique de
                                 retrait), or buy-out, which, if following the
                                 buy-out Alcan also holds at least 95% of the
                                 total share capital in Pechiney, may be
                                 followed by a compulsory acquisition (retrait
                                 obligatoire), or squeeze-out, of all remaining
                                 Pechiney securities not held by Alcan,
                                 including all Pechiney Common Shares, Pechiney
                                 OCEANEs, Pechiney Bonus Allocation Rights and
                                 Pechiney ADSs. The CMF would establish the
                                 offer calendar for any such withdrawal offer or
                                 compulsory acquisition. The consideration
                                 offered in any such withdrawal offer or
                                 compulsory acquisition may be different from
                                 the consideration offered in this offer. Any
                                 such withdrawal offer or compulsory acquisition
                                 may be made to U.S. holders of Pechiney
                                 securities in reliance on certain exemptions
                                 from the U.S. tender offer rules.


MARKET FOR PECHINEY SECURITIES
AFTER THE OFFERS..............   If, as a result of these offers, there is no
                                 longer an active trading market for the
                                 Pechiney Common Shares or the Pechiney OCEANEs
                                 and the liquidity of these Pechiney securities
                                 is materially adversely affected, Alcan may
                                 petition Euronext Paris to cause the delisting
                                 of the Pechiney Common Shares and/or Pechiney
                                 OCEANEs. Any such petition for delisting would
                                 be subject to the approval of the French
                                 Commission des operations de bourse, or COB.
                                 Furthermore, subject to the completion of the
                                 offers, Alcan intends to cause Pechiney to
                                 terminate its deposit agreement with the
                                 depositary for the Pechiney ADSs, and to
                                 petition, or cause Pechiney to petition, the
                                 New York Stock Exchange to delist the Pechiney
                                 ADSs.

                                 If Alcan acquires sufficient Pechiney Common
                                 Shares in the offers to cause the delisting of
                                 the Pechiney Common Shares, then, pursuant to
                                 the terms of the Pechiney OCEANEs, the holders
                                 of the Pechiney OCEANEs may require Pechiney to
                                 redeem the Pechiney OCEANEs for a make-whole
                                 payment. In addition, if less than 10% of the
                                 number of issued Pechiney OCEANEs

                                        7


                                 remains outstanding following the consummation
                                 of these offers, Alcan may cause Pechiney to
                                 redeem the Pechiney OCEANEs at a redemption
                                 price determined pursuant to the terms of the
                                 Pechiney OCEANEs (such redemption price would
                                 equal an amount that would provide the holder
                                 of a Pechiney OCEANE with a return equal to the
                                 gross yield to maturity that would have been
                                 realized by such holder at maturity). This
                                 redemption price may be lower than the
                                 consideration offered to holders of the
                                 Pechiney OCEANEs in these offers.


PROCEDURES FOR TENDERING
PECHINEY SECURITIES...........   The procedure for tendering Pechiney securities
                                 varies depending on a number of factors,
                                 including (i) whether you hold Pechiney Common
                                 Shares, Pechiney Bonus Allocation Rights,
                                 Pechiney OCEANEs or Pechiney ADSs, (ii) whether
                                 you possess physical certificates or a
                                 financial intermediary holds physical
                                 certificates for you, (iii) whether you hold
                                 your securities in book-entry form and (iv)
                                 whether you hold your Pechiney securities
                                 through a financial intermediary in the United
                                 States or France. You should read carefully the
                                 procedures for tendering your securities
                                 beginning on page 65 of this prospectus as well
                                 as the transmittal materials.



WITHDRAWAL RIGHTS.............   You will be able to withdraw your tender of
                                 Pechiney securities at any time prior to and
                                 including the expiration date. For withdrawal
                                 to be effective, the exchange agent must
                                 receive, prior the expiration of the offer
                                 period, a timely written notice of withdrawal
                                 at its address set forth on the back cover of
                                 this prospectus. If a subsequent offering
                                 period is provided, you may withdraw any
                                 Pechiney securities tendered during that
                                 subsequent period at any time prior to its
                                 expiration. Withdrawn securities may be
                                 retendered prior to the expiration of the offer
                                 period by following the tender requirements set
                                 forth below under "The Offers -- Terms of the
                                 Offers -- Procedures for Tendering Pechiney
                                 Securities" at page 65.



DELIVERY OF ALCAN COMMON
SHARES AND CASH; SETTLEMENT
DATE..........................   In the event that these offers are successful,
                                 the exchange agent will deliver Alcan Common
                                 Shares and cash to tendering holders following
                                 the publication by the CMF of the final results
                                 of the offers. If the offers are consummated,
                                 settlement is currently expected to take place
                                 approximately 12 to 18 French trading days
                                 following the expiration date of the offers.
                                 Similarly, in the event of a subsequent
                                 offering period, if any, settlement is expected
                                 to occur within 12 to 18 French trading days
                                 following the expiration of that subsequent
                                 offer period. With respect to tendered Pechiney
                                 ADSs only, the cash consideration payable in
                                 this offer will be paid in U.S. dollars
                                 calculated by converting the applicable amount
                                 in euros into U.S. dollars using the noon
                                 buying rate, as published by the Federal
                                 Reserve Bank of New York, on the business day
                                 prior to the settlement date.


COMPARISON OF THE RIGHTS OF
PECHINEY SHAREHOLDERS AND
ALCAN SHAREHOLDERS............   Depending on the consideration you elect and
                                 the results of the proration and allocation
                                 procedures, you may receive Alcan Com-
                                        8



                                 mon Shares if you tender your Pechiney Common
                                 Shares, Pechiney Bonus Allocation Rights or
                                 Pechiney ADSs in this offer. There are numerous
                                 differences between the rights of a shareholder
                                 in Pechiney, a French societe anonyme, and the
                                 rights of a shareholder in Alcan, a Canadian
                                 corporation. We urge you to review the
                                 discussion under "Comparison of Shareholders'
                                 Rights" beginning on page 101 for a summary of
                                 these differences.


ACCOUNTING TREATMENT..........   The acquisition of the Pechiney securities will
                                 be accounted for using the purchase method
                                 under both Canadian and U.S. GAAP. Under the
                                 purchase method, the cost of the purchase will
                                 be based on the cash paid to Pechiney
                                 securityholders, the market value of Alcan
                                 Common Shares issued to Pechiney
                                 securityholders, fair value of any stock
                                 options of Pechiney replaced with stock options
                                 of Alcan and the direct transaction costs. In
                                 Alcan's consolidated financial statements, the
                                 cost of the purchase will be allocated to the
                                 Pechiney assets acquired and liabilities
                                 assumed, based on their estimated fair values
                                 at the acquisition date, with any excess of the
                                 cost over the amounts allocated being
                                 recognized as goodwill. This method may result
                                 in the carrying value of assets, including
                                 goodwill, acquired from Pechiney being
                                 substantially different from the former
                                 carrying values of those assets.


REGULATORY APPROVALS..........   Completion of the offers is conditional upon
                                 receipt of regulatory approvals from the
                                 European Commission and any Relevant National
                                 Authorities to whom the Commission may refer
                                 jurisdiction to review all or part of the
                                 transaction and the termination or expiration
                                 of the waiting period under the
                                 Hart-Scott-Rodino Antitrust Improvements Act of
                                 1976, as amended. There can be no assurance
                                 that the necessary approvals or clearances will
                                 be granted or that they will be granted on
                                 favorable terms. It is possible that certain
                                 regulatory approvals or clearances will be
                                 subject to conditions and obligations, which
                                 may include the disposal of certain significant
                                 assets or businesses. It is possible that such
                                 conditions and obligations will have a material
                                 effect on certain of the financial assumptions
                                 upon which the information in this prospectus
                                 is based. We may choose to proceed with the
                                 offers even though we are required to comply
                                 with such conditions and obligations.


                                 The offers are also subject to the prior
                                 approval of France's Minister of the Economy,
                                 Finance and Industry.


LISTING OF ALCAN COMMON
SHARES........................   Alcan Common Shares are currently listed on the
                                 New York, Toronto, London and Swiss stock
                                 exchanges. Alcan will apply to list its Alcan
                                 Common Shares on Euronext Paris, subject to the
                                 successful completion of these offers. Alcan
                                 will also apply for the supplemental listing of
                                 the Alcan Common Shares to be issued in these
                                 offers on the New York, Toronto, Paris, London
                                 and Swiss stock exchanges.



INTERESTS OF DIRECTORS AND
EXECUTIVE OFFICERS OF ALCAN
AND PECHINEY..................   Based on the number of Alcan Common Shares
                                 issued and outstanding on July 31, 2003, the
                                 directors and officers of Alcan,


                                        9


                                 individually and the group as a whole, held
                                 less than one percent of the issued and
                                 outstanding Alcan Common Shares.

                                 Pechiney's 2002 20-F states that, as of
                                 December 31, 2002, none of Pechiney's directors
                                 and executive officers held Pechiney securities
                                 that, combined with options to purchase
                                 Pechiney Common Shares they held, would have
                                 entitled them to beneficially own one percent
                                 or more of any class of Pechiney securities.

MATERIAL FRENCH, CANADIAN AND
UNITED STATES FEDERAL INCOME
TAX CONSEQUENCES OF THE
EXCHANGE......................


     French Taxation..........   The following applies to you if you are a
                                 non-resident of France for French tax purposes
                                 that is not a member of a special class of
                                 taxpayers for French tax purposes. You will not
                                 be subject to French tax on any capital gain or
                                 loss recognized, for French tax purposes, as a
                                 result of exchanging your Pechiney securities
                                 for Alcan Common Shares, cash or a combination
                                 of both, unless you have a permanent
                                 establishment or fixed base in France and the
                                 Pechiney securities exchanged are part of the
                                 business property of that permanent
                                 establishment or fixed base. The gain or loss,
                                 if any, will equal the difference between the
                                 value of the Alcan Common Shares and any cash
                                 received and your tax basis in your Pechiney
                                 securities exchanged.


     Canadian Taxation........   If you are a non-Canadian holder (as defined in
                                 "Taxation" below), then you will not be subject
                                 to Canadian federal tax on any gain that you
                                 realize upon exchanging your Pechiney
                                 securities for Alcan Common Shares, cash or a
                                 combination of both.


     United States Federal
     Income Taxation..........   The following applies to you if you are a U.S.
                                 holder (as defined in "Taxation" below) that is
                                 not a member of a special class of taxpayers
                                 for U.S. federal income tax purposes. You will
                                 recognize gain or loss, if any, for United
                                 States federal income tax purposes as a result
                                 of exchanging your Pechiney securities for
                                 Alcan Common Shares, cash or a combination of
                                 both. You will recognize gain or loss in an
                                 amount equal to the difference between the fair
                                 market value of any Alcan Common Shares plus
                                 any amount of cash that you receive in the
                                 exchange and the U.S. dollar value of your
                                 adjusted tax basis in your Pechiney securities
                                 exchanged. Any such gain or loss will be
                                 capital gain or loss, except that in the case
                                 of an exchange of a Pechiney OCEANE, any gain
                                 attributable to accrued interest or market
                                 discount in excess of a de minimis amount will
                                 be treated as ordinary income and any gain or
                                 loss attributable to changes in the U.S.
                                 dollar/euro exchange rate will be treated as
                                 ordinary gain or loss. Long-term capital gain
                                 of a noncorporate U.S. holder currently is
                                 taxable at a maximum rate of 15%.



                                 If you are a non-U.S. holder (as defined in
                                 "Taxation" below), you will not be subject to
                                 United States federal income taxation on any
                                 gain or loss recognized or on the interest or
                                 other amounts of ordinary income received in
                                 exchanging your Pechiney securities.
                                 Exceptions, however, are described under
                                 "Taxation -- Tax Con-

                                        10



                                 sequences of Exchanging Pechiney
                                 Securities -- United States Federal Income
                                 Taxation -- Non-U.S. holders" below.



THE EXCHANGE AGENT............   The Bank of New York has been appointed
                                 exchange agent in connection with this offer.
                                 The Letter of Transmittal (or facsimile copies
                                 thereof) and certificates for Pechiney ADSs
                                 should be sent by each tendering Pechiney
                                 securityholder or his or her broker, dealer,
                                 bank or other nominee to the exchange agent at
                                 the addresses set forth on the back cover of
                                 this prospectus.


REQUESTS FOR ASSISTANCE.......   If you have questions or want copies of
                                 additional documents, you may contact:


                                      The information agent, D.F. King & Co.,
                                 Inc.,
                                 at
                                           48 Wall Street
                                        New York, New York 10005


                                        (212) --

                                 or
                                      The dealer manager, Morgan Stanley & Co.
                                 Incorporated, at
                                           1585 Broadway Avenue
                                        New York, New York 10036
                                        (212) 761-4000

                                        11


        SUMMARY SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA OF ALCAN

The following statements of income data for each of the three years in the
three-year period ended December 31, 2002 and the balance sheet data at December
31, 2002, 2001 and 2000 have been derived from Alcan's consolidated financial
statements incorporated by reference into this document, which have been audited
by PricewaterhouseCoopers LLP, independent accountants.


The statement of income data for each of the six-month periods ended June 30,
2003 and 2002 and the balance sheet data at June 30, 2003 have been derived from
Alcan's unaudited consolidated financial statements for the quarter ended June
30, 2003, which have been incorporated by reference into this document. Balance
sheet data at June 30, 2002 has been derived from Alcan's unaudited consolidated
financial statements for the quarter ended June 30, 2002, which have not been
incorporated by reference into this document.



You should read the data below in conjunction with Alcan's consolidated
financial statements (including the notes thereto) and Management's Discussion
and Analysis of Financial Condition and Results of Operations in the Alcan 2002
10-K and Alcan's 2003 Second Quarter 10-Q, which are incorporated by reference
into this document.



Alcan reports its financial results in U.S. dollars and in conformity with
Canadian GAAP, with a reconciliation to U.S. GAAP. A description of the
principal differences between Canadian GAAP and U.S. GAAP as they relate to
Alcan's consolidated financial statements is set forth in Note 7 of the "Notes
to Consolidated Financial Statements", included in Alcan's 2002 10-K and in Note
5 to the 2003 Second Quarter 10-Q, which are incorporated by reference into this
prospectus.





                                            FOR THE SIX MONTHS
                                              ENDED JUNE 30,             FOR THE YEARS ENDED DECEMBER 31,
                                            -------------------    --------------------------------------------
                                              2003       2002       2002     2001     2000    1999(2)   1998(2)
                                            --------   --------    ------   ------   ------   -------   -------
                                                (UNAUDITED)
                                                  (IN MILLIONS OF U.S. DOLLARS EXCEPT PER SHARE AMOUNTS)
                                                                                   
CANADIAN GAAP INFORMATION(3)
Sales and operating revenues..............    6,681      6,034     12,540   12,626    9,148    7,324     7,789
Income from continuing operations.........       37        159        374        2      610      448       400
Net income (loss).........................      (76)       157        374        2      610      448       400
Total assets..............................   18,273     17,316(1)  17,538   17,458   18,389    9,839     9,948
Long-term debt (including current
  portion)................................    3,752      3,716      3,482    3,536    3,528    1,322     1,703
Other debt................................      348        397        385      555    1,080      167        86
Cash and time deposits....................      127        121        110      119      261      315       615
Shareholders' equity......................    8,591      8,385(1)   8,625    8,770    9,009    5,531     5,566
Income from continuing operations per
  Share...................................     0.10       0.49       1.15    (0.02)    2.42     2.01      1.71
Net income (loss) per Share...............    (0.25)      0.48       1.15    (0.02)    2.42     2.01      1.71
Cash dividends per Share..................     0.45       0.30       0.60     0.60     0.60     0.60      0.60
U.S. GAAP INFORMATION
Income from continuing operations before
  cumulative effect of accounting
  change..................................       36        213       (336)     (54)     606      455       417
Net income (loss).........................     (116)      (537)(1)   (336)     (54)     606      455       417
Income from continuing operations before
  cumulative effect of accounting change
  per Share...............................     0.10       0.65      (1.06)   (0.19)    2.40     2.04      1.79
Net income (loss) per Share...............    (0.37)     (1.68)     (1.06)   (0.19)    2.40     2.04      1.79
Total assets..............................   18,122     17,341(1)  17,538   17,458   18,389    9,839     9,901
Shareholders' equity......................    8,232      8,172(1)   8,291    8,570    9,005    5,550     5,561



---------------
(1) On January 1, 2002, Alcan adopted new accounting standards concerning
    goodwill and other intangible assets. Beginning in 2002, goodwill is no
    longer amortized but is subject to annual testing for impairment.

                                        12



    For the years 2001 and 2000, net income included amortization of goodwill
    amounting to $73 and $16 million, respectively, in accordance with
    accounting standards in effect prior to 2002.


(2) Canadian GAAP information for the years 1999 and 1998 has been restated to
    reflect the change in accounting policy, made in 2002, for exchange gains
    and losses on the translation of long-term monetary assets and liabilities.

(3) The information above reflects the combination of Alcan and Alusuisse Group
    AG on October 17, 2000. For the years 2001 and 2000 Canadian GAAP net income
    per common share before amortization of goodwill was $0.21 and $2.47,
    respectively.

                                        13


      SUMMARY SELECTED HISTORICAL CONSOLIDATED FINANCIAL DATA OF PECHINEY

The following statements of income data for each of the three years in the
three-year period ended December 31, 2002 and the balance sheet data at December
31, 2002, 2001 and 2000 have been derived from Pechiney's consolidated financial
statements incorporated by reference into this document. These financial
statements were accompanied by an audit report dated January 29, 2003, issued by
Pechiney's independent accountants, who have not yet consented to the use of
their report in this Registration Statement and may not consent to such use. The
statements of income data for the years ended December 31, 1999 and 1998 and the
balance sheet data at December 31, 1999 and 1998 have been derived from
Pechiney's audited consolidated financial statements for those years, which have
not been incorporated by reference into this document.


The statement of income data for each of the six-month periods ended June 30,
2003 and 2002 and the balance sheet data at June 30, 2003 have been derived from
Pechiney's unaudited consolidated financial statements for the quarter ended
June 30, 2003, which have been incorporated by reference into this document.
Balance sheet data at June 30, 2002 has been derived from Pechiney's unaudited
consolidated financial statements for the quarter ended June 30, 2002, which
have not been incorporated by reference into this document.



You should read the data below in conjunction with Pechiney's consolidated
financial statements (including the notes thereto) and the "Operating and
Financial Review and Prospects" in Pechiney's Annual Report on Form 20-F for the
year ended December 31, 2002, as filed with the SEC on March 25, 2003, and in
Pechiney's Current Report on Form 6-K, dated July 30, 2003, which are
incorporated into this document by reference.



Pechiney reports its financial results in euros and in conformity with French
GAAP, with a reconciliation to U.S. GAAP. Pechiney also publishes condensed U.S.
GAAP information. A description of the principal differences between French GAAP
and U.S. GAAP as they relate to Pechiney's consolidated financial statements is
set forth in Note 25 of the "Notes to Consolidated Financial Statements"
included in Pechiney's Annual Report on Form 20-F for the year ended December
31, 2002, as filed with the SEC on March 25, 2003, and the Appendix to the
Second Quarter Results 2003 filed on Form 6-K on July 30, 2003.


                                        14





                                               FOR THE SIX MONTHS
                                                 ENDED JUNE 30,          FOR THE YEARS ENDED DECEMBER 31,
                                               -------------------   -----------------------------------------
                                                2003        2002      2002     2001     2000    1999     1998
                                               -------     -------   ------   ------   ------   -----   ------
                                                   (UNAUDITED)
                                                 (IN MILLIONS OF EUROS EXCEPT PER SHARE AND PER ADS AMOUNTS)
                                                                                   
FRENCH GAAP INFORMATION
Net sales and other operating revenues.......   5,527       6,282    12,053   11,204   10,827   9,646   10,012
Net income (loss)............................      11          46       (50)     233      314     260      311
Total assets.................................   8,209       8,499     8,234    8,683    8,073   7,687    9,282
Long-term debt (including current portion)...   1,513       1,476     1,504    1,008      765   1,076    1,932
Other debt...................................     372         389       390      912      592     456    1,188
Cash and marketable securities...............     351         496       436      434      461     468    1,033
Shareholders' equity.........................   2,877       3,195     3,014    3,395    3,273   3,026    2,624
Net income (loss) per Pechiney Common
  Share......................................    N.A.        N.A.     (0.66)    2.92     3.90    3.17     3.80
Net income (loss) per Pechiney ADS...........    N.A.        N.A.     (0.33)    1.46     1.95    1.58     1.90
Cash dividends per Pechiney Common Share.....    N.A.        N.A.      1.00     1.00     1.00    0.81     0.80
Cash dividends per Pechiney ADS..............    N.A.        N.A.      0.50     0.50     0.50    0.40     0.40
U.S. GAAP INFORMATION
Income before cumulative effect of accounting
  change.....................................      31         126        27      205      314     260      311
Net income (loss)............................      67          95        (4)     194      314     260      311
Income before cumulative effect of accounting
  change per Pechiney Common
  Share -- Basic.............................    N.A.        N.A.      0.32     2.57     3.90    3.17     3.80
Income before cumulative effect of accounting
  change per Pechiney Common
  Share -- diluted...........................    N.A.        N.A.      0.32     2.55     3.88    3.16     3.80
Net income (loss) per Pechiney Common
  Share -- Basic.............................    N.A.        N.A.     (0.07)    2.43     3.90    3.17     3.80
Net income (loss) per Pechiney Common
  Share -- Diluted...........................    N.A.        N.A.     (0.07)    2.42     3.88    3.16     3.80



---------------

N.A. -- Information not available

In 1998 the consolidated financial statements were initially prepared in French
francs and then translated to euros using the official exchange rate of 6.55957
French francs per euro which was fixed on December 31, 1998. The comparability
of Pechiney's consolidated financial statements from one year to another is not
affected by the translation to euros.

                                        15


          SELECTED UNAUDITED PRO FORMA COMBINED FINANCIAL INFORMATION;
                  UNAUDITED PRO FORMA COMBINED CAPITALIZATION

The following selected unaudited pro forma combined financial information, which
gives effect to the offers, is presented in U.S. dollars and reflects the
combination of Alcan and Pechiney using the purchase method under U.S. GAAP. The
pro forma adjustments are based upon available information and certain
assumptions that Alcan believes are reasonable, including the assumptions that
pursuant to the offers:

     - all of the outstanding Pechiney Common Shares are exchanged for Alcan
       Common Shares and cash. 3 Alcan Common Shares and E123 in cash are
       exchanged for every 5 Pechiney Common Shares;


     - all of the outstanding Pechiney Bonus Allocation Rights are exchanged for
       Alcan Common Shares and cash. 3 Alcan Common Shares and E123 in cash are
       exchanged for every 50 Pechiney Bonus Allocation Rights (assumed to have
       been satisfied by the issuance of Pechiney Common Shares during the three
       month period ended June 30, 2003);


     - all of the outstanding Pechiney OCEANEs are exchanged for cash. Each
       Pechiney OCEANE is exchanged for E81.70;

     - all of the outstanding Pechiney ADSs are exchanged for Alcan Common
       Shares and cash. 3 Alcan Common Shares and E123 in cash are exchanged for
       every 10 Pechiney ADSs;

     - all of the outstanding Pechiney stock options are exchanged for Alcan
       stock options; and

     - the cash consideration paid in the offers is financed by additional Alcan
       debt.


The selected unaudited pro forma combined financial information is presented for
illustrative purposes only and is not necessarily indicative of the operating
results or financial condition of the combined entities that would have been
achieved if the offers had been completed during the periods presented, nor is
the selected unaudited pro forma combined financial information necessarily
indicative of the future operating results or financial position of the combined
entities. The unaudited pro forma combined financial information does not
reflect any cost savings or other synergies which may result from the
combination. The unaudited pro forma financial information does not reflect any
special items such as payments pursuant to change of control provisions or
restructuring and integration costs which may be incurred as a result of the
acquisition. In addition, the financial effects of any actions described in the
section "The Offers -- Reasons for the Offers -- Employment Matters," such as
costs of rationalization or synergies, cannot currently be determined and are
therefore not reflected in the unaudited pro forma combined financial
statements. Because Alcan has access only to publicly available financial
information about Pechiney's accounting policies, there can be no assurance that
the accounting policies of Pechiney conform to those of Alcan.



In order to obtain regulatory approval, Alcan may be required to divest certain
businesses, operations or assets. Alcan has offered commitments to the European
Commission to divest certain businesses of Alcan and/or Pechiney in order to
obtain the approval of the European Commission. Because these commitments have
not yet been accepted by the European Commission, they have not been reflected
in the unaudited pro forma combined financial statements. Alcan anticipates that
the businesses that it is likely to be required to divest to comply with
conditions imposed by a regulatory authority will represent approximately 4% to
5% of total unaudited pro forma combined revenues. See "The Offers -- Reasons
for the Offers -- Commitments Offered to the European Commission to Obtain
Regulatory Approval".



This selected unaudited pro forma combined financial information has been
derived from and should be read in conjunction with the "Pro Forma Combined
Financial Statements of Alcan and Pechiney" on page 85 and the related notes
included herein, and with the respective consolidated financial information of
Alcan and Pechiney as of and for the six months ended June 30, 2003, and as of
and for the year ended December 31, 2002, which are incorporated herein by
reference. All amounts are stated in U.S. dollars. This pro forma information is
subject to risks and uncertainties, including those discussed under "Risk
Factors -- Risks Relating to the Offers -- We Have Not Been Given the
Opportunity to Conduct a Due Diligence Review of the Non-Public Records of
Pechiney. Therefore, We May Be Subject to Unknown Liabilities of Pechiney which
May Have a Material Adverse Effect on Our Profitability And Results Of
Operations" and "Risk

                                        16



Factors -- Risks Relating to the Offers -- We Have Not Verified the Reliability
of the Pechiney Information Included in, or Incorporated by Reference into, this
Prospectus and, as a Result, Our Estimates of the Benefits of Consummation of
the Offers on the Pro Forma Information in this Prospectus May be Incorrect."


As noted above, Alcan prepares its financial statements in accordance with
Canadian GAAP, and provides a reconciliation of such financial statements to
U.S. GAAP. Since Pechiney does not prepare Canadian GAAP financial information,
but does prepare a U.S. GAAP reconciliation of its financial statements, the pro
forma financial information herein is prepared in accordance with U.S. GAAP.

UNAUDITED PRO FORMA COMBINED FINANCIAL INFORMATION




                                                       SIX MONTHS ENDED           YEAR ENDED
                                                         JUNE 30, 2003        DECEMBER 31, 2002
                                                      -------------------    --------------------
                                                      (UNAUDITED AND IN MILLIONS OF U.S. DOLLARS
                                                             EXCEPT PER SHARE INFORMATION)
                                                                       
Sales and operating revenues........................        12,802                  23,704
Income from continuing operations before
  nonrecurring charges or credits directly
  attributable to the acquisition...................            64                     427
Basic net income per Common Share...................          0.17                    1.14






                                                                 AS OF JUNE 30, 2003
                                                              -------------------------
                                                                  (UNAUDITED AND IN
                                                              MILLIONS OF U.S. DOLLARS)
                                                           
Total assets................................................           28,424
Long-term debt (including current portion)..................            4,703
Short term borrowings.......................................            3,623
Cash and time deposits......................................              456
Shareholders' equity........................................            9,974



UNAUDITED CAPITALIZATION




                                                                              PRO FORMA
                                                               ALCAN       COMBINED ENTITY
                                                           JUNE 30, 2003    JUNE 30, 2003
                                                             (US GAAP)        (US GAAP)
                                                           -------------   ---------------
                                                            (UNAUDITED AND IN MILLIONS OF
                                                                    U.S. DOLLARS)
                                                                     
Short term borrowings....................................        323            3,623
Debt maturing within one year............................        187              398
Debt not maturing within one year........................      3,454            4,305
                                                              ------           ------
Total debt...............................................      3,964            8,326
Minority Interest........................................        195              363
SHAREHOLDERS' EQUITY
Preference shares........................................        160              160
Common shares............................................      4,711            6,392
Retained earnings........................................      3,273            3,273
Other....................................................         88              149
                                                              ------           ------
Total shareholders' equity...............................      8,232            9,974
CONSOLIDATED CAPITALIZATION..............................     12,196           18,663
                                                              ======           ======



                                        17


                    COMPARATIVE PER SHARE MARKET INFORMATION


Alcan Common Shares are listed on the New York Stock Exchange under the symbol
"AL", the Toronto Stock Exchange under the symbol "AL.TO", the London Stock
Exchange under the symbol "ALq.L" and the SWX Swiss Exchange under the symbol
"AL.S". Pechiney Common Shares are listed on Euronext Paris under the ISIN code
FR0000132904 and quoted on SEAQ International in London under the symbol
"PECHaq.L", and Pechiney ADSs are listed on the New York Stock Exchange under
the symbol "PY". Pechiney Bonus Allocation Rights were listed on Euronext Paris
under the ISIN code FR0000951634 through August 4, 2003, and from that date
continue to trade over-the-counter. The following table presents the closing
market prices per security for Alcan Common Shares, Pechiney Common Shares,
Pechiney Bonus Allocation Rights and Pechiney ADSs in euros or U.S. dollars, as
the case may be:


     - as reported on the New York Stock Exchange for Alcan Common Shares;


     - as reported on the Euronext Paris for Pechiney Common Shares and, for
       dates up to August 4, 2003, Pechiney Bonus Allocation Rights;



     - as reported on the over-the-counter market for Pechiney Bonus Allocation
       Rights;


     - as reported on the New York Stock Exchange for Pechiney ADSs.


In each case the prices given are, first, as of July 3, 2003 or July 4, 2003,
which was the last full trading day on the New Year Stock Exchange and on
Euronext Paris, respectively, prior to the public announcement of these proposed
offers and, second, as of August 26, 2003, the most recent practicable trading
day prior to the date of this prospectus. See "Market Price and Dividend Data"
on page 119 for further information about historical market prices of these
securities.



The following table also presents the implied equivalent closing market prices
per security for Pechiney Common Shares, Pechiney Bonus Allocation Rights and
Pechiney ADSs in U.S. dollars. These prices were calculated by multiplying the
closing market prices per share of Alcan Common Shares by the exchange ratio of
3 Alcan Common Shares for every 5 Pechiney Common Shares, 3 Alcan Common Shares
for every 50 Pechiney Bonus Allocation Rights and 3 Alcan Common Shares for
every 10 Pechiney ADSs, and then adding to those amounts the U.S. dollar
equivalent of the cash portion of the exchange consideration of E123 for every 5
Pechiney Common Shares, E123 for every 50 Pechiney Bonus Allocation Rights and
E123 for every 10 Pechiney ADSs. In calculating the equivalent basis market
value per Pechiney security, euro amounts have been translated into U.S. dollars
at a rate of E1.00 = $1.1503, which was the Federal Reserve Bank of New York
noon buying rate on July 3, 2003, and at a rate of E1.00 = $1.0893, which was
the Federal Reserve Bank of New York noon buying rate on August 26, 2003, as
applicable.





                                                                               EQUIVALENT BASIS MARKET VALUE
                                    ALCAN               PECHINEY                   PER PECHINEY SECURITY
                                   -------   ------------------------------   --------------------------------
                                   COMMON               BONUS                              BONUS
                                   SHARES    COMMON   ALLOCATION               COMMON    ALLOCATION
                                   -------   SHARES    RIGHTS)       ADSS      SHARES      RIGHTS       ADSS
                                   (NYSE;    ------   ----------   --------   --------   ----------   --------
                                   U.S. $)   (EURO)     (EURO)     (U.S. $)   (U.S. $)    (U.S. $)    (U.S. $)
                                   -------   ------   ----------   --------   --------   ----------   --------
                                                                                 
July 3 or July 4, 2003, as
  applicable.....................   31.46    34.70       3.79       19.27        47.17       4.72       23.59
August 26, 2003..................   35.66    45.50       4.45       24.75        48.19       4.82       24.10



The market prices of Alcan Common Shares and Pechiney Common Shares, Pechiney
Bonus Allocation Rights and Pechiney ADSs are likely to fluctuate prior to the
expiration date of these offers and cannot be predicted. We urge you to obtain
current market information regarding Alcan Common Shares and Pechiney Common
Shares, Pechiney Bonus Allocation Rights and Pechiney ADSs.

                                        18


      SUMMARY SELECTED COMPARATIVE HISTORICAL AND PRO FORMA PER SHARE DATA

The following tables set forth certain historical per share data for Alcan and
Pechiney as well as unaudited pro forma and equivalent pro forma combined per
share data to reflect the combination of Alcan and Pechiney. The pro forma
adjustments are based upon available information and certain assumptions that
Alcan believes are reasonable, including the assumptions that pursuant to the
offers:

     - all of the outstanding Pechiney Common Shares are exchanged for Alcan
       Common Shares and cash. 3 Alcan Common Shares and E123 in cash are
       exchanged for every 5 Pechiney Common Shares;


     - all of the outstanding Pechiney Bonus Allocation Rights are exchanged for
       Alcan Common Shares and cash. 3 Alcan Common Shares and E123 in cash are
       exchanged for every 50 Pechiney Bonus Allocation Rights (assumed to have
       been satisfied by the issuance of Pechiney Common Shares during the
       three-month period ended June 30, 2003);


     - all of the outstanding Pechiney OCEANEs are exchanged for cash. Each
       Pechiney OCEANE is exchanged for E81.70;

     - all of the outstanding Pechiney ADSs are exchanged for Alcan Common
       Shares and cash. 3 Alcan Common Shares and E123 in cash are exchanged for
       every 10 Pechiney ADSs;

     - all of the outstanding Pechiney stock options are exchanged for Alcan
       stock options; and

     - the cash consideration paid in the offers is financed by additional Alcan
       debt.

The summary selected comparative historical and pro forma per share data is
presented for illustrative purposes only and is not necessarily indicative of
the operating results or financial condition of the combined entities that would
have been achieved if the offers had been completed during the periods
presented, nor is the summary selected comparative historical and pro forma per
share data necessarily indicative of the future operating results or financial
position of the combined entities.


This summary selected comparative historical and pro forma per share data has
been derived from and should be read in conjunction with the "Pro Forma Combined
Financial Statements of Alcan and Pechiney" on page 85 and the related notes
included herein, and with the respective consolidated financial information of
Alcan and Pechiney as of and for the six months ended June 30, 2003, and as of
and for the year ended December 31, 2002, which are incorporated herein by
reference. All amounts are stated in U.S. dollars. This pro forma information is
subject to risks and uncertainties, including those discussed under "Risk
Factors -- Risks Relating to the Offers -- We Have Not Been Given the
Opportunity to Conduct a Due Diligence Review of the Non-Public Records of
Pechiney. Therefore, We May Be Subject to Unknown Liabilities of Pechiney Which
May Have a Material Adverse Effect on Our Profitability and Results of
Operations" and "Risk Factors -- Risks Relating to the Offers -- We Have Not
Verified the Reliability of the Pechiney Information Included in, or
Incorporated by Reference into, this Prospectus and, as a Result, Our Estimates
of the Benefits of Consummation of the Offers on the Pro Forma Information in
this Prospectus May be Incorrect."





                                               ALCAN
                                     -------------------------                   PECHINEY(1)
                                     HISTORICAL    PRO FORMA     --------------------------------------------
                                        PER       COMBINED PER   HISTORICAL PER   EQUIVALENT PER
                                       COMMON        COMMON          COMMON           COMMON       HISTORICAL
U.S. GAAP INFORMATION                  SHARE         SHARE           SHARE            SHARE         PER ADS
---------------------                ----------   ------------   --------------   --------------   ----------
                                                                                    
SIX MONTHS ENDED JUNE 30, 2003
Net income from continuing
  operations.......................    $ 0.10        $ 0.17(2)       $ 0.42           $ 0.25         $ 0.21
Dividends(3).......................    $ 0.45        $ 0.45            N.A.             N.A.           N.A.
Book value.........................    $25.57        $26.49          $41.29           $24.77         $20.65
YEAR ENDED DECEMBER 31, 2002
Net income (loss) from continuing
  operations.......................    $ 1.26        $ 1.14(2)       $(0.07)          $(0.04)        $(0.03)
Dividends(3).......................    $ 0.60        $ 0.60          $ 1.05           $ 0.63         $ 0.52
Book value.........................    $25.79          N.A.(4)       $39.76           $23.86         $19.88



                                        19


---------------

(1) Euro amounts were translated using the average rate of each financial period
    for "Net income (loss) from continuing operations." Euro amounts were
    translated at period-end rate for "Dividends" and "Book value." For more
    information on historical currency exchange rates see "Exchange Rate
    Information" on page 125.



(2) Represents net income (loss) from continuing operations before nonrecurring
    charges or credits directly attributable to the acquisition.



(3) The Alcan pro forma dividends per share represent the historical per share
    dividends paid by Alcan.



(4) Not available because the Unaudited pro forma combined balance sheet is not
    presented as at December 31, 2002.



N.A. -- Information not available.


                                        20


                                  RISK FACTORS


You should carefully consider the following risks and the risk factors
incorporated by reference into this prospectus from Item 3 of Pechiney's 2002
20-F, together with the other information contained in or incorporated by
reference into this prospectus, before making any decision concerning the terms
of this offer or whether to accept it. Any of these risks could have a material
adverse effect on our business, financial condition and results of operations,
which could in turn affect the price of our Alcan Common Shares.


RISKS RELATING TO THE OFFERS

INTEGRATION OF THE COMPANIES MAY FAIL OR DISRUPT OPERATIONS.


The anticipated benefits and synergies expected to result from the offers will
depend in part upon whether the operations of Alcan can be integrated in an
efficient and effective manner with those of Pechiney. Successful integration
will require the integration of various aspects of each company's business. The
anticipated benefits expected to result from this integration may not be
achieved completely, if at all. The ability to achieve these anticipated
benefits could be more difficult in an unsolicited transaction opposed by or not
supported by the Pechiney board of directors. Failure to successfully integrate
the business organizations could have a material adverse effect on the financial
condition and results of the operations of Alcan and result in the failure to
achieve certain of the expected benefits from the combination, including
synergies and other operating efficiencies. The integration of the business
organizations could interfere with the activities of one or more of the
businesses of the companies which could have material adverse effects on their
operations. In addition, the integration of the business organizations may
involve a number of other risks, including the diversion of management's
attention from the day-to-day operations of each company's business.


EVEN IF ALCAN CONSUMMATES THE OFFERS, THERE MAY BE A DELAY BEFORE ALCAN CAN
OBTAIN CONTROL OF THE MANAGEMENT OF PECHINEY.

In order for Alcan to take management control of Pechiney following successful
completion of the offers, Alcan will need to take control of the board of
directors of Pechiney. Pursuant to Article L. 225-103, II, 4 of the French
Commercial Code, if Alcan gains control of Pechiney pursuant to the offers,
Alcan may request the board of directors of Pechiney to convene a shareholders'
meeting with an agenda which will provide for the election of the directors. If
Pechiney's board of directors fails to convene such a shareholders' meeting,
Alcan is permitted, after a reasonable delay and notice to Pechiney's board of
directors, to convene a meeting for the election of directors. This meeting may
be held no sooner than 30 days after the publication of a notice announcing the
meeting in the French official legal gazette.

FIXED EXCHANGE RATIO WILL NOT REFLECT MARKET FLUCTUATIONS AND EXCHANGE RATES MAY
FLUCTUATE.

Pechiney securityholders are being offered a fixed number of Alcan Common Shares
and cash in the offers, rather than Alcan Common Shares with a fixed market
value and cash. The market values of Alcan Common Shares and the Pechiney
securities at the time of the completion of the offers may vary significantly
from the value at the date of this prospectus or the date that you tender your
Pechiney securities. Furthermore, currency exchange rates may fluctuate and the
prevailing euro/U.S. dollar exchange rate on the settlement date may be
significantly different from the exchange rate on the date of this prospectus or
the date that you tender your Pechiney securities. These changes may
significantly affect the value of the consideration you receive for tendered
Pechiney securities.

REGULATORY APPROVALS MAY NOT BE OBTAINED OR MAY IMPOSE ADVERSE CONDITIONS AND
OBLIGATIONS.


Completion of the transaction is conditional upon receipt of regulatory
approvals from the European Commission, Relevant National Authorities (if any)
to whom jurisdiction to review all or part of the transaction has been referred
by the European Commission, and the U.S. antitrust authorities. See "Regulatory
Matters" beginning on page 95. All necessary approvals may not be granted or may
not be granted on favorable terms. It is possible that certain regulatory
approvals will be subject to conditions and obligations that could adversely
affect the financial position or operations of the combined entity. These

                                        21



conditions and obligations could include the divestiture of certain assets or
business divisions or the imposition of obligations on Alcan that restrict the
manner in which it can carry on business in the future. Should any such
divestitures, conditions or obligations be required and implemented, there could
be a material effect upon the business of Alcan or Pechiney. Although such
material effect could be negative, Alcan may nevertheless elect to proceed with
the offers as being in its best financial and strategic interests. In connection
with the offers, prior to making its notification of the transaction to the
European Commission on August 14, 2003, Alcan held discussions with the European
Commission concerning the possibility that it may need to offer divestiture
and/or other remedies in order to obtain approval from the European Commission.
Subsequent to filing its notification of the transaction, on August 18, 2003
Alcan submitted commitments to the European Commission to divest certain
European businesses of Alcan and/or Pechiney in relation to flat-rolled
products, aluminum aerosol cans and aluminum cartridges, as described under "The
Offers -- Reasons for the Offers -- Commitments Offered to the European
Commission to Obtain Regulatory Approval" below. Any divestiture and/or other
remedies that have been or may be offered by Alcan may not be accepted by the
European Commission. Alcan may need to modify the offer made on August 18, 2003
or to make similar offers in respect to other products. Any remedies offered by
Alcan may not be accepted by the European Commission or any other relevant
regulatory authorities with jurisdiction to review the transaction. Any
divestitures or other conditions or obligations imposed by the relevant
regulatory authorities may include operations that account for significant
amounts of revenues and net income for Alcan or Pechiney. Furthermore, Alcan may
decide that significant amounts of additional assets should be disposed of in
connection with any such divestitures for various business reasons. Any
divestitures ultimately required for regulatory reasons, or any related
divestitures, may have a material adverse effect upon our business or results of
operations in the future.



The proposed acquisition of the Pechiney securities is a notifiable transaction
under the Competition Act (Canada), and as such may not be completed until a
required notification is filed with the Canadian competition authorities and the
relevant waiting period has expired. A required filing in respect of the
proposed transaction was made on July 30, 2003 and the applicable waiting period
will expire on September 10, 2003. The Canadian competition authorities may
challenge the transaction at any time before or within three years after
completion of the transaction. Such an investigation, if initiated, may have a
material adverse impact on the operations of Alcan or Pechiney. In addition, the
transaction is required to be notified to the Swiss Federal Competition
Commission under the competition laws of Switzerland. If the Swiss Federal
Competition Commission begins an investigation, the transaction may not close
until the Commission renders a final decision or grants a special authorization.
Investigations must be completed within a four month period. While Alcan does
not anticipate that the Swiss competition clearance process will delay or
otherwise adversely affect the transaction, the Swiss Federal Competition
Commission may initiate an investigation and, if initiated, it may make its
approval subject to conditions and obligations that would adversely affect the
operations of Alcan or Pechiney.



Other jurisdictions throughout the world claim jurisdiction under their
competition or antitrust laws in respect of acquisitions or mergers that have
the potential to affect their domestic marketplace. A number of these
jurisdictions will have or claim to have jurisdiction to review the transaction.
Although Alcan does not anticipate that there will be any investigations or
proceedings in any such jurisdiction that would have a material impact on the
completion of the offers or the operations of Alcan or Pechiney, such
investigations or proceedings, whether by governmental authorities or private
parties, may be initiated and, if initiated, may have a material adverse impact
on the completion of the offers or the operations of Alcan or Pechiney.



ALCAN IS A CANADIAN CORPORATION, AND SHAREHOLDERS OF A CANADIAN CORPORATION HAVE
FEWER RIGHTS AND PRIVILEGES THAN SHAREHOLDERS OF A FRENCH CORPORATION IN CERTAIN
RESPECTS.



Alcan is governed by the Canada Business Corporations Act (the "CBCA") and by
its restated articles of incorporation and by-laws. The CBCA extends to
shareholders certain rights and privileges that may not exist under French law
and, conversely, does not extend certain rights and privileges that shareholders
of a company governed by French law may have. Differences between the CBCA and
French law that could result in shareholders of a Canadian corporation having
fewer rights and privileges than shareholders of a French


                                        22



company include, among others, additional limitations on transactions with
interested directors and officers under French law, certain restrictive rules
governing indemnification and liability of directors under French law and
greater restrictions on shareholders' proposals and shareholder suits under the
CBCA. In addition, Alcan has adopted a shareholder rights plan, which could
limit the rights of Alcan shareholders in certain circumstances. Pechiney has
not adopted such a plan. For a more detailed comparison of the rights of Alcan
shareholders versus the rights of Pechiney securityholders, see our discussion
in the section captioned "Comparison of Shareholders' Rights" beginning on page
101.


WE HAVE NOT BEEN GIVEN THE OPPORTUNITY TO CONDUCT A DUE DILIGENCE REVIEW OF THE
NON-PUBLIC RECORDS OF PECHINEY. THEREFORE, WE MAY BE SUBJECT TO UNKNOWN
LIABILITIES OF PECHINEY WHICH MAY HAVE A MATERIAL ADVERSE EFFECT ON OUR
PROFITABILITY AND RESULTS OF OPERATIONS.


In commencing the offers and determining their terms and conditions, we have
relied solely and exclusively upon publicly available information relating to
Pechiney, including periodic and other reports for Pechiney as filed with or
furnished to the SEC on Form 20-F and Form 6-K, as well as Pechiney's 2002
Document de reference, as filed with the COB. We have not conducted an
independent due diligence review of any non-public information about Pechiney.
On July 7, 2003, we sent letters to Pechiney and to Pechiney's independent
public accountants, requesting, among other things, information and cooperation
with respect to our registration statement, of which this prospectus is a part.
As of the date of this prospectus, we have not had access to due diligence
materials or the management or independent public accountants of Pechiney. As a
result, after the consummation of our offers, we may be subject to unknown
liabilities of Pechiney, which may have a material adverse effect on our
profitability, results of operations and financial position, which we might have
otherwise discovered if we had been permitted by Pechiney to conduct a complete
due diligence review.



WE HAVE NOT VERIFIED THE RELIABILITY OF THE PECHINEY INFORMATION INCLUDED IN, OR
INCORPORATED BY REFERENCE INTO, THIS PROSPECTUS AND, AS A RESULT, OUR ESTIMATES
OF THE BENEFITS OF CONSUMMATION OF THE OFFERS ON THE PRO FORMA INFORMATION IN
THIS PROSPECTUS MAY BE INCORRECT.



In respect of information relating to Pechiney presented in, or incorporated by
reference into, this prospectus, including all Pechiney financial information,
we have relied exclusively upon publicly available information, including
information publicly filed by Pechiney with securities regulatory authorities.
Although we have no knowledge that would indicate that any statements contained
herein based upon such reports and documents are inaccurate, incomplete or
untrue, we were not involved in the preparation of such information and
statements and, therefore, cannot verify the accuracy, completeness or truth of
such information or any failure by Pechiney to disclose events that may have
occurred, but that are unknown to us, that may affect the significance or
accuracy of any such information. Pechiney has not provided representatives of
Alcan access to Pechiney's accounting records and has not permitted its
independent public accountants to provide us with any information, including an
independent public accountants' consent. This lack of cooperation has required
adjustments and assumptions to be made with respect to Pechiney's financial
information in preparing the pro forma financial information regarding Pechiney
presented in this prospectus. Any financial information regarding Pechiney that
may be detrimental to the combined entity and that has not been publicly
disclosed by Pechiney, or errors in our estimates due to the lack of cooperation
from Pechiney, may have an adverse effect on the benefits we expect to achieve
through the consummation of the offers and may result in material inaccuracies
in the pro forma information included in this prospectus.


CONSUMMATION OF THE OFFERS MAY RESULT IN ADVERSE TAX CONSEQUENCES.

We have not had access to information concerning Pechiney's tax situation. It is
possible that the consummation of the offers may result in adverse tax
consequences arising from a change of ownership of Pechiney. The tax
consequences of a change of ownership of a corporation can lead to an inability
to carry-over certain tax attributes, including but not limited to tax losses,
tax credits and/or tax basis of assets. In addition, the change of ownership may
result in other tax costs not normally associated with the ordinary course of
business. Such other tax costs include, but are not limited to, stamp duties,
land transfer taxes,

                                        23


franchise taxes and other levies. The fact that Alcan is unaware of information
relevant to a determination of the potential tax consequences and related costs
represents an additional transaction risk.

THE OFFERS COULD TRIGGER CERTAIN CHANGE OF CONTROL PAYMENTS IN THE EMPLOYMENT
AGREEMENTS OF CERTAIN MEMBERS OF PECHINEY'S SENIOR MANAGEMENT, AS WELL AS CHANGE
OF CONTROL PROVISIONS IN OTHER CONTRACTS OF PECHINEY.

The employment agreements of certain members of the Pechiney senior management
and other employees may contain change of control clauses providing for
compensation to be granted in the event the employment of these employees is
terminated following the consummation of the offers, either by Pechiney or by
those employees. If successful, the offers would effect such a change of
control, thereby giving rise to potential change of control payments, which
could be substantial and which could materially adversely affect our results of
operations in the period they become payable. In addition, other contracts to
which Pechiney is a party may contain change of control provisions that could be
triggered by the completion of the offers, possibly resulting in termination of
those contracts or increased obligations or loss of benefits to Pechiney.

THE SUBSTANTIAL INCREASE IN THE NUMBER OF ALCAN COMMON SHARES FOLLOWING THE
TRANSACTION MAY ADVERSELY AFFECT THEIR MARKET PRICE.


Upon completion of the offers for Pechiney securities, assuming that all
Pechiney securities are acquired, additional Alcan Common Shares, representing
up to approximately 17.34% of the current share capital of Alcan, will be
available for trading in the public market. The increase in the number of Alcan
Common Shares may lead to sales of such shares or the perception that such sales
may occur, either of which may adversely affect the market for, and the market
price of, the Alcan Common Shares.


THE MARKET FOR PECHINEY SECURITIES MAY BE ADVERSELY AFFECTED BY THE OFFERS.

If the offers for Pechiney securities are successful, the liquidity and market
value of the remaining Pechiney securities held by the public could be adversely
affected by the fact that they will be held by a smaller number of holders.


Depending upon the number of Pechiney securities acquired pursuant to the
Pechiney offers, following the completion of the offers the Pechiney ADSs may no
longer meet the requirements of the New York Stock Exchange for continued
listing and the Pechiney Common Shares and Pechiney OCEANEs may no longer meet
the requirements of Euronext Paris for continued listing. Moreover, to the
extent permitted under applicable law and stock exchange regulations, Alcan may
seek to cause the delisting of the Pechiney ADSs, Pechiney Common Shares and
Pechiney OCEANEs on such exchanges.



If the New York Stock Exchange were to delist the Pechiney ADSs, or if the
Euronext Paris were to delist the Pechiney Common Shares or Pechiney OCEANEs,
the market for these securities could be adversely affected. Although it is
possible that the Pechiney ADSs, Pechiney Common Shares and Pechiney OCEANEs
would be traded on other securities exchanges or in the over-the-counter market,
and the price quotations would be reported by such exchanges, or through the
National Association of Securities Dealers, Inc. Automated Quotations System or
by other sources, such trading quotations may not occur. In addition, the extent
of the public market for the Pechiney ADSs, Pechiney Common Shares, Pechiney
Bonus Allocation Rights and Pechiney OCEANEs and the availability of such
quotations would, however, depend upon the number of holders and/or the
aggregate market value of the Pechiney ADSs, Pechiney Common Shares, Pechiney
Bonus Allocation Rights and Pechiney OCEANEs, as the case may be, remaining at
such time, the interest in maintaining a market in the Pechiney ADSs, Pechiney
Common Shares, Pechiney Bonus Allocation Rights and Pechiney OCEANEs, as the
case may be, on the part of securities firms and the possible termination of
registration of ADSs under the Securities Exchange Act of 1934. If such
registration is terminated, Pechiney could cease filing periodic reports with
the SEC, which could further impact the value of the Pechiney ADSs. To the
extent the availability of such listings or quotations depends on steps taken by
Alcan or Pechiney, Alcan or Pechiney may or may not take such steps. Therefore,
you should not rely on any such listing or quotation being available.


                                        24


RISKS RELATING TO THE BUSINESS OF ALCAN IF THE OFFERS ARE SUCCESSFUL

The business of Alcan is and will continue to be subject to a number of risks,
including those listed below. Certain of these risks may be increased by the
completion of the transactions and the acquisition of Pechiney.

INCREASED EXPOSURE TO CURRENCY EXCHANGE RATE FLUCTUATIONS MAY ADVERSELY IMPACT
FINANCIAL RESULTS.


A substantial portion of Alcan's revenue is determined in U.S. dollars while a
significant portion of its costs related to those revenues are incurred in
Canadian and Australian dollars. Additionally, Alcan's earnings from its
European subsidiaries are substantially denominated in euros. Fluctuations in
exchange rates between the U.S. dollar and these currencies give rise to
currency exposure. This exposure is generally favorable to Alcan when the U.S.
dollar strengthens against the Canadian and Australian dollars and unfavorable
when it weakens. Conversely, Alcan is disadvantaged when the U.S. dollar
strengthens against the euro and is advantaged when it weakens. Where judged
appropriate, Alcan seeks to manage a portion of the impact of this risk by
entering into forward currency contracts and options, but such hedging
activities are limited in nature, may be costly and in any event do not normally
extend beyond three years and therefore will not eliminate a material portion of
the potentially significant adverse effect that exchange rate fluctuations could
have on Alcan's results of operations or financial condition over an extended
period. Following completion of the offers, Alcan will be exposed to additional
possibly offsetting currency exchange risk, primarily with respect to the euro,
as a much more significant amount of its revenues generated in Europe is
expected to be generated in U.S. dollars while a more significant portion of its
operating expenses related to those revenues is expected to be incurred in
euros. Such currency exchange risks may have a materially adverse effect on
Alcan's operating results in the future.



ALCAN WILL BE EXPOSED TO INCREASED TRADING AND BROKERAGE RISKS.



Pechiney engages in substantial trading and brokerage activities. For example,
Pechiney's 2002 financial statements indicate that E5,036 million, or 42%, of
Pechiney's 2002 net sales resulted from its trading and brokerage operations.
Alcan does not have comparable operations and if the offers are consummated,
will be exposed to the risks of these businesses, including credit and
derivatives risks and the risk of significant losses if prices move contrary to
the expectations of Pechiney at the time the related contracts were entered into
and if Pechiney's risk management procedures prove to be inadequate. The risks
of Pechiney's trading and brokerage businesses may result in material losses to
Alcan after consummation of the offers and such losses may materially adversely
affect Alcan's results of operations, liquidity and financial position.


ALCAN WILL BE EXPOSED TO INCREASED MARKET AND CREDIT RISK IN DERIVATIVES.

Each of Alcan and Pechiney uses derivatives to hedge, among other things, its
exposure to changes in exchange rates, interest rates and metals prices. In
addition, Pechiney's trading activities involve extensive use of derivatives.
Alcan will accordingly be subject to significantly increased market and credit
risks relating to derivatives after completion of the offers.

ALCAN MAY BE EXPOSED TO INCREASED ENVIRONMENTAL COSTS AND LIABILITIES.

Each of Alcan and Pechiney is subject to a broad range of environmental laws and
regulations in each of the jurisdictions in which it operates. These laws and
regulations, as interpreted by relevant agencies and the courts, impose
increasingly stringent environmental protection standards regarding, among other
things, air emissions, wastewater storage, treatment and discharges, the use and
handling of hazardous or toxic materials, waste disposal practices, and the
remediation of environmental contamination. The costs of complying with these,
including participation in assessments and remediation of sites, could be
significant. In addition, these standards can create the risk of substantial
environmental liabilities, including liabilities associated with divested assets
and past activities. Currently, each of Alcan and Pechiney is involved in a
number of

                                        25



compliance efforts and legal proceedings concerning environmental matters. Each
of Alcan and Pechiney has established reserves for environmental remediation
activities and liabilities. However, environmental matters cannot be predicted
with certainty, and these amounts may not be adequate, especially in light of
potential changes in environmental conditions or the discovery of previously
unknown environmental conditions, the risk of governmental orders to carry out
additional compliance on certain sites not initially included in remediation in
progress, and the potential liability of each of Alcan and Pechiney to remediate
sites for which provisions have not been previously established. Such future
developments could result in increased environmental costs and liabilities that
could have a material adverse effect on Alcan's financial position and results
of operations.


Some of Alcan's and Pechiney's current and potential operations are located in
or near communities that may now, or in the future, regard such operations as
having a detrimental effect on their social and economic circumstances. Should
this occur, the consequences of such a development may have a material adverse
impact upon the profitability or, in extreme cases, the viability of an
operation. In addition, such developments may adversely affect Alcan's ability
to enter into new operations in such location or elsewhere.

ALCAN WILL BE EXPOSED TO INCREASED POTENTIAL RISKS OF LOSSES FROM OPERATIONS IN
LESS DEVELOPED COUNTRIES.


After the offers Alcan will have increased operations in developing countries
which may be more vulnerable to risks of war, civil disturbances and adverse
governmental action, such as nationalization, re-negotiation or nullification of
existing contracts, leases, permits or other agreements, changes in laws, policy
and currency restrictions, as well as other unanticipated risks, which may
disrupt or impede operations and markets, restrict the movement of funds, impose
limitations on foreign exchange transactions or result in the expropriation of
assets. Certain of the countries in which Alcan will operate have recently been
subject to economic or political instability. Any of these factors could
materially adversely affect Alcan's operations in such countries.


ALCAN MAY BE EXPOSED TO RISKS RELATING TO CAPITAL PROJECTS OF PECHINEY.


Pechiney has announced its involvement in a number of significant capital
projects for which there is little available information to identify and
quantify commitments and to determine potential financial impact. These include,
for example, Pechiney's Coega smelter project in South Africa and its Bauxilum
bauxite and alumina project in Venezuela. If the offers are completed,
Pechiney's commitments with respect to these capital projects may materially
adversely affect Alcan's results of operations in the future.


ALCAN WILL CONTINUE TO BE EXPOSED TO VOLATILITY IN THE ALUMINUM INDUSTRY.

Alcan is a leading global producer of aluminum and aluminum fabricated products.
The aluminum industry is highly cyclical, with prices subject to worldwide
market forces of supply and demand and other influences. Prices have been
volatile historically and Alcan expects such volatility to continue. Although
Alcan uses contractual arrangements with customers, employs certain measures to
manage its exposure to the volatility of London Metals Exchange based prices and
is product and segment diversified, Alcan's results of operations could be
materially adversely affected by material adverse changes in economic or
aluminum industry conditions generally. Aluminum end use markets, including the
automotive and building and construction sectors, are also cyclical. When
downturns occur in these sectors, decreased demand for aluminum may result in
lower prices for Alcan's products and may have a material adverse effect on
Alcan's results of operations.

ALCAN'S OPERATIONS WILL CONTINUE TO BE EXPOSED TO CHANGES IN CERTAIN ECONOMIC
CONDITIONS AND GOVERNMENT ACTIONS.

Economic and other factors in the many countries in which Alcan operates,
including inflation, fluctuations in currency and interest rates, competitive
factors, civil unrest and labor problems, could affect Alcan's revenues,
expenses and results of operations. Alcan's operations could also be adversely
affected by government actions such as controls on imports, exports and prices,
new forms of taxation, and increased government regulation in the countries in
which Alcan operates or services customers.

                                        26


ALCAN'S OPERATIONS WILL CONTINUE TO BE DEPENDENT ON SUBSTANTIAL AMOUNTS OF
ENERGY.


Alcan consumes substantial amounts of energy in its operations. Although Alcan
generally expects to meet the energy requirements for its aluminum smelters and
alumina refineries from internal sources or from long-term contracts, the
following factors could materially adversely affect its results of operations:
the unavailability of hydroelectric power due to droughts, significant increases
in costs of supplied electricity, interruptions in energy supply due to
equipment failure or other causes or the inability to extend contracts upon
expiration on economical terms. In addition, aluminum smelters generally require
an uninterrupted supply of intense electrical energy, and any interruption of
more than a very short duration, whatever the cause, may have a major technical,
commercial and financial impact on the activities of the facility concerned.
Pechiney currently obtains a significant portion of its electricity requirements
under contracts with Electricite de France. Alcan may not be able to renew or
replace these contracts on comparable terms following their expiry.


If energy costs were to rise, or if energy supplies or supply arrangements were
disturbed, Alcan's profitability may decline, which could lead to a reduction in
any dividends or cause the trading prices of Alcan Common Shares to decline.

ALCAN'S PROFITABILITY WILL BE AFFECTED BY CHANGES IN THE COST AND AVAILABILITY
OF RAW MATERIALS.

The raw materials that Alcan uses in manufacturing its products include caustic
soda and calcined petroleum coke and resins. The prices of many of the raw
materials Alcan uses depend on supply and demand relationships at a worldwide
level, and are therefore subject to variation.

Prices for the raw materials Alcan requires may increase and, if they do, Alcan
may not be able to pass on the entire cost of the increases to its customers or
to offset fully the effects of higher raw material costs through productivity
improvements, which may cause its profitability to decline. In addition, there
is a potential time lag between changes in prices under Alcan's purchase
contracts and the point when Alcan can implement a corresponding change under
its sales contracts with its customers. As a result, Alcan cannot necessarily
protect itself from fluctuations in raw materials prices since during the time
lag period Alcan may have to temporarily bear the additional cost of the change
under its purchase contracts, which could have a temporary negative impact on
its profitability.

THE MARKETS FOR ALCAN'S PRODUCTS ARE HIGHLY COMPETITIVE.

The markets for aluminum and packaging products are highly competitive. In
addition, aluminum competes with other materials, such as steel, plastics and
glass, among others, for various applications in Alcan's key customer sectors.
The willingness of customers to accept substitutions for the products sold by
Alcan, the ability of large customers to apply buyer power in the marketplace to
affect the pricing for fabricated aluminum or packaging products or other
developments could affect Alcan's results of operations.


ALCAN MAY BE ADVERSELY AFFECTED BY CHANGES IN THE BUSINESS OR FINANCIAL
CONDITION OF ITS SIGNIFICANT CUSTOMERS.



A significant downturn in the business or financial condition of significant
customers supplied by Alcan could materially adversely affect Alcan's results of
operations in a particular period. In addition, although Alcan believes it has
good working relationships with these customers, if Alcan's existing
relationships with them materially deteriorate or are terminated in the future,
and Alcan is not successful in replacing business lost to such customers,
Alcan's results of operations may be harmed, which could materially adversely
affect our results of operations and lead to a reduction in dividends and cause
the trading prices of Alcan Common Shares to decline.


                                        27


ALCAN MAY BE SUBJECT TO LIABILITY RELATED TO THE USE OF HAZARDOUS SUBSTANCES IN
PRODUCTION.

Alcan uses a variety of materials and chemicals in its manufacturing processes,
as well in connection with maintenance work on its manufacturing facilities. In
the event that any of these substances or related residues proves to be toxic,
Alcan may be liable for increased costs for health-related claims or removal or
re-treatment of such substances.

Although Alcan does not currently use asbestos or its derivatives as raw
materials in its manufacturing processes, there is some risk of asbestos
exposure associated with the existence of asbestos-containing materials in its
manufacturing buildings and equipment.

ALCAN MAY BE EXPOSED TO SIGNIFICANT LEGAL PROCEEDINGS OR INVESTIGATIONS.

Alcan's results of operations or liquidity in a particular period could be
affected by significant legal proceedings or investigations adverse to Alcan,
including product liability, health and safety and other claims.

ALCAN IS EXPOSED TO PREVAILING INTEREST RATES AND EQUITY MARKET RETURNS IN
CONNECTION WITH ITS PENSION PLANS.

Alcan sponsors defined benefit pension plans for its employees in Canada, the
United States, the United Kingdom, Switzerland and certain other countries.
Alcan's pension plan assets consist primarily of listed stocks and bonds. Its
estimate of liabilities and expenses for pensions and other post-retirement
benefits incorporate significant assumptions, including interest rates used to
discount future benefits and expected long-term rates of return on plan assets.
Alcan's results of operations, liquidity or shareholders' equity in a particular
period could be materially adversely affected by equity market returns that are
less than their expected long-term rate of return or a decline of the rate used
to discount future benefits.

If the assets of Alcan's pension plans do not achieve expected investment
returns for any fiscal year, such deficiency would result in one or more charges
against earnings. In addition, changing economic conditions, poor pension
investment returns or other factors may require Alcan to make substantial cash
contributions to the pension plans in the future, preventing the use of such
cash for other purposes. For example, we recently made a significant
contribution to one of our Canadian defined benefit plans as a result of recent
poor investment performance.


ALCAN'S PAST AND FUTURE ACQUISITIONS OR DIVESTITURES MAY ADVERSELY AFFECT ITS
FINANCIAL CONDITION.


Alcan has grown partly through the acquisition of other businesses. There are
numerous risks commonly encountered in business combinations and Alcan cannot
ensure that the Alcan management will be able effectively to integrate
businesses acquired, or generate the cost savings and synergies anticipated.
Failure to do so could have a material adverse effect on Alcan's costs, earnings
and cash flows.


As part of its strategy for growth, Alcan may continue to make acquisitions,
divestitures or strategic alliances, which may not be completed or may not be
ultimately beneficial to Alcan.



NEW TECHNOLOGY MAY ADVERSELY AFFECT ALCAN'S PROFITABILITY.


Alcan has invested in and is involved with a number of technology and process
initiatives. Several technical aspects of these initiatives are still unproven
and the eventual commercial outcomes cannot be assessed with any certainty.
Accordingly, the costs and benefits from Alcan's investments in new technologies
and the consequent effects on Alcan's future earnings and financial results may
vary widely from present expectations.

Alcan is committed to protecting its trade secrets and investing in research and
development in order to maintain the benefits of its technology in the future.
However, Alcan may not be able to protect, or continue to develop, some of its
proprietary technology in the future. In addition, Alcan may be subject to
litigation in the future regarding the use of proprietary technology that it has
developed.

                                        28


ALCAN IS SUBJECT TO THE RISK OF UNION DISPUTES AND ADVERSE EMPLOYEE RELATIONS.


The majority of our hourly-paid employees are represented by labor unions under
a large number of collective labor agreements. We may not be able to
satisfactorily renegotiate our collective labor agreements when they expire. In
addition, existing labor agreements may not prevent a strike or work stoppage at
our facilities in the future, and any such work stoppage could have a material
adverse effect on our financial condition and results of operations.


                                        29



           CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS



Certain statements made or incorporated by reference in this prospectus are
forward-looking statements. These forward-looking statements are subject to
risks and uncertainties. Forward-looking statements include, but are not limited
to, statements concerning industry growth and other trend projections,
anticipated financial or operating performance, business and financial
prospects, strategies, objectives, goals, targets and synergies, and the savings
and benefits anticipated to be realized from the combination of Alcan and
Pechiney. Forward-looking statements in this prospectus are sometimes preceded
by, followed by or include the words "believes", "expects", "estimates",
"intends", "anticipates", "plans", "may", "could", "should", "will" or similar
expressions. Although Alcan's management believes that the expectations
reflected in such forward-looking statements are reasonable, readers are
cautioned that these forward-looking statements by their nature involve risk and
uncertainty because they relate to events and depend on circumstances that will
occur in the future. Many factors, in addition to those discussed elsewhere in
this prospectus and in the documents we incorporate by reference, could cause
actual results and developments to differ materially from those expressed or
implied by these forward-looking statements.



Factors that could cause actual results or outcomes to differ materially from
the results expressed or implied by forward-looking statements include, but are
not necessarily limited to, those discussed in the section "Risk Factors," as
well as, among other things:



     - changes in global aluminum supply and demand conditions;



     - changes in aluminum ingot prices;



     - changes in raw materials costs and availability;



     - changes in the relative values of various currencies;



     - cyclical demand and pricing within the principal markets for Alcan's and
       Pechiney's products;



     - changes in government regulations, particularly those affecting
       environmental, health or safety compliance;



     - fluctuations in the supply of and prices for energy in the areas in which
       Alcan or Pechiney maintains production facilities;



     - the effect of integrating acquired businesses (including Pechiney) and
       the ability to realize anticipated savings and benefits;



     - potential catastrophic damage, increased insurance and security costs and
       general uncertainties associated with the increased threat of terrorism
       or war;



     - the effect of international trade disputes on Alcan's or Pechiney's
       ability to import materials, export its products and compete
       internationally;



     - relationships with, and financial and operating conditions of, customers
       and suppliers;



     - economic, regulatory and political factors within the countries in which
       Alcan or Pechiney operate or sell products; and



     - factors affecting Alcan's or Pechiney's operations, such as litigation,
       labor relations and negotiations and fiscal regimes.


                                        30


                                   THE OFFERS


                             REASONS FOR THE OFFERS



Alcan is pursuing its offers for Pechiney because of the significant
value-creating opportunities the offers present to both Alcan and Pechiney
shareholders. The transaction is intended to enable Alcan to build upon its
position as one of the world's leading aluminum and packaging companies and to
benefit from the combined entity's enhanced scale, financial strength and
technological resources as well as its increased capability to serve customers
worldwide. The combined entity will also benefit from a larger and more
diversified low-cost global position in primary aluminum production with
opportunities for profitable growth, an advanced aluminum fabricating business
with facilities around the world and a leading position in flexible packaging.
The addition of Pechiney will enhance Alcan's research and development and
product and process development capabilities across all of its business sectors.



Reflecting Alcan's significantly increased industrial presence in France, Alcan
intends to locate the global headquarters of the combined entity's packaging
business in Paris and has identified France as the headquarters for its European
primary aluminum business and the combined entity's future global headquarters
for new cell technology development in primary aluminum. Alcan is also
considering the possibility of establishing the global headquarters of the
combined entity's aerospace and engineered products group in France.


Alcan believes that its enhanced size and scope as a result of its acquisition
of Pechiney will enable it to capitalize on a greater variety of strategic
options. Alcan intends to continue pursuing value-maximizing strategies
consistent with its Value Based Management system through a careful analysis of
the expanded opportunity set that Alcan will benefit from following the
transaction.


In 1999, Alcan, Pechiney and Alusuisse-Lonza Group AG, or "algroup," proposed a
three-way combination (referred to as the "proposed APA transaction"). At that
time, Alcan, Pechiney and algroup identified a series of compelling strategic
benefits in connection with that transaction. These included:


     - a sustainable low-cost position in primary aluminum production,

     - the combination of their aluminum fabrication offerings,

     - the creation of a world leader in the packaging business,

     - leadership in core smelting technology,

     - substantial synergies arising from scale, plant optimization, elimination
       of duplication, and implementing best practices throughout the merged
       group.


The proposed APA transaction was conditional upon, among other things, receipt
of merger approval from the European Commission. The inability to resolve
certain transaction issues (including agreeing upon the undertakings that were
required in order to meet the objections of the European Commission to the
proposed APA transaction and to resolve the reasons why the European Commission
rejected the parties' offer of remedies made by them with a view to securing
regulatory approval from the European Commission) led Alcan, algroup and
Pechiney to jointly terminate the APA transaction. Alcan was, however, able to
subsequently complete its acquisition of algroup (which was approved by the
European Commission, subject to certain conditions and obligations) and achieve
many of the anticipated benefits from the proposed APA transaction. Alcan is
convinced that the fundamental strategic logic of the proposed APA transaction,
which was endorsed at the time by Pechiney's then and current CEO, remains valid
and compelling.



In assessing the merits of the transaction, Alcan has taken into account its
past experience with, and the statements of, the European Commission at the time
of the proposed APA transaction. Based upon this experience, Alcan has also
considered the nature and extent of the remedies that it may need to offer in
order to obtain approval from the European Commission. Alcan has further
considered its strategic outlook and believes that the substantial benefits of
its enhanced size and scope, financial strength and improved strategic
flexibility following completion of the transaction substantially outweigh the
likely impact of the undertakings that may be required in order to obtain


regulatory approvals and the other risks associated with the transaction.

                                        31



On August 18, 2003 Alcan offered commitments to the European Commission to
divest certain European businesses of Alcan and/or Pechiney in the flat-rolled
products, aluminum cartridges and aluminum aerosol cans sectors. Alcan believes
that these commitments resolve all potential competition concerns that may be
raised by the European Commission in relation to the aforementioned products and
fully address the reasons why the European Commission was unable to accept the
undertakings offered during the proposed APA transaction in relation to the same
products. Alcan's current strategic view of the European flat-rolled products
market is such that certain divestiture commitments that were not acceptable in
1999 would be acceptable today. Alcan will continue its dialogue with the
European Commission in relation to these commitments. See "-- Commitments
Offered to the European Commission to Obtain Regulatory Approval" beginning on
page 36.



The consideration in these offers reflects changes since 1999 in the respective
markets served by Alcan and Pechiney and in the outlook for each company. These
changes result from a variety of factors, including a revised industry view of
lower aluminum prices, the deterioration in demand from the aerospace industry,
the increase in the relative value of the euro to the dollar, and continued
pressure in the packaging sector as a result of customer consolidation. Alcan
has also taken into account its successful integration of algroup, as well as
the complementary profit enhancement initiatives already underway at both Alcan
and Pechiney. Furthermore, since the acquisition of algroup, Alcan has also
successfully executed the acquisitions of 30% of the Gove alumina refinery, 40%
of the Alouette smelter and VAW's FlexPac packaging business.


BUSINESS PLANS AND EXPECTED BENEFITS OF THE TRANSACTION


Following the transaction, the combined entity will benefit from the
complementary strengths of Alcan and Pechiney. Total revenues of the combined
entity on a pro forma basis will be approximately $24 billion based on 2002
revenues and Alcan will employ approximately 88,000 employees in more than 50
countries around the world.



The pro forma impact of the transaction in terms of revenue and work force
break-down is shown below on a segment basis:



Break-down of 2002 revenues by segment(1)





                                        ALCAN              PECHINEY              COMBINED ENTITY(2)
                                      ----------   ------------------------   ------------------------
                                                                   % OF                       % OF
                                                                   TOTAL                      TOTAL
                                         % OF         % OF      EXCL. INT'L      % OF      EXCL. INT'L
                                        TOTAL        TOTAL         TRADE        TOTAL         TRADE
                                      ----------   ----------   -----------   ----------   -----------
                                                                            
Primary Aluminum....................      23%          13%           23%          18%           23%
Conversion..........................      54%          22%           37%          39%           48%
Packaging...........................      22%          19%           33%          21%           26%
Other...............................       0%           4%            6%           1%            3%
TOTAL (EXCLUDING INTERNATIONAL
  TRADE)............................     100%          58%          100%          80%          100%
International Trade.................                   42%                        20%
Total...............................                  100%                       100%



---------------


(1) Using an exchange rate of $1.00 = E0.9454


(2) Derived from Alcan's Canadian GAAP consolidated financial statements for the
    year ended December 31, 2002 and Pechiney's French GAAP consolidated
    financial statements for the year ended December 31, 2002.


                                        32



Break-down of 2002 work force by segment





                                                                                    COMBINED
                                                           ALCAN       PECHINEY    ENTITY(1)
                                                         ----------   ----------   ----------
                                                         % OF TOTAL   % OF TOTAL   % OF TOTAL
                                                         ----------   ----------   ----------
                                                                          
Primary Aluminum.......................................      33%          19%          27%
Conversion.............................................      38%          23%          32%
Packaging..............................................      27%          48%          36%
Other(2)...............................................       2%          10%           5%
TOTAL..................................................     100%         100%         100%



---------------


(1) Derived using the the same basis of presentation as the unaudited Pro Forma
    Combined Financial Statements of Alcan and Pechiney beginning on page 85.


(2) Including International Trade at Pechiney


The aluminum and packaging business units will be among the largest companies in
their respective industries, operating on a global scale. The expected benefits
from this enhanced size and scope and Alcan's plans are outlined below.


Alumina.  The combined entity will benefit from:


     - an increased ownership position (from 20.4% to 41.4%) in Queensland
       Alumina Ltd., the largest and one of the lowest cost alumina producers in
       the world,

     - the integration of geographically complementary bauxite mining and
       alumina refining capacities, and

     - opportunities to extend and improve the alumina production technology of
       the two companies.


Primary Aluminum.  The combined entity is expected to benefit from its larger
low-cost position and opportunities for low-cost growth in primary aluminum
production based on, among other things:


     - the increased scale, geographic diversification and integration of the
       two companies' low cost smelting systems,

     - increased opportunities to sustain and enhance Pechiney's strong position
       in new cell, high-amperage smelting technology and to extend its
       implementation,

     - opportunities to extend the best manufacturing practices of each company,
       including anticipated higher production efficiency through amperage
       increases and improved cell operation, and

     - an increased ability to evaluate and participate in value-creating
       brownfield and greenfield smelting projects worldwide.


Fabricated Aluminum.  Following the transaction, Alcan will further enhance its
position as a world leader in the fabricated and rolled aluminum products
businesses. The addition of Pechiney's fabrication operations will provide the
combined entity with opportunities to:


     - participate, with a strong global position in the specialized and
       strategic aerospace market,

     - better serve the increasing demand for aluminum applications in the
       automotive industry, in both North America and Europe,


     - build upon Pechiney's technology and know-how by applying its enhanced
       capabilities to the enlarged group's expanded operations, and


     - increase productivity through global implementation of best practices and
       the usage of the world-class rolling technologies of both companies.

Packaging.  The combination of Alcan's and Pechiney's flexible and specialty
packaging businesses will create one of the largest packaging companies in the
world with a leading position in flexible packaging, complementary market
positions in North America and Europe and a strong range of value-added
products.

                                        33


Alcan intends to locate the global headquarters of the combined entity's
packaging business in Paris. The combined packaging business will benefit from:


     - an enhanced geographically balanced operating platform offering a higher
       value, global range of packaging products,


     - improved capabilities to serve the needs of multinational customers,

     - a strong platform from which Alcan can actively pursue growth
       opportunities in this global industry, and

     - combining the combined entity's research and development activities and
       best practices in developing new products and improving manufacturing
       processes.


International Trade.  Alcan intends to evaluate the value creation alternatives
for Pechiney's International Trading business, including the possibility of
incorporating it into Alcan's existing operations. During the course of this
evaluation, Pechiney's International Trading business will be operated on a
stand-alone basis.



Technology.  Following completion of the transaction, Alcan intends to continue
to actively support Pechiney's technology facilities with continued and enhanced
investments to further develop Pechiney's world leading technologies,
particularly in aluminum smelting. Specifically, Alcan plans to retain and
enhance Pechiney's research and development capabilities in France, where it has
established and nurtured a recognized center of excellence. In this regard,
Alcan has identified France as the combined entity's future global headquarters
for new cell technology in primary aluminum.



Benefits to Pechiney and its Shareholders.  Pechiney's operations will benefit
from the advantages and opportunities that are expected to result from the
combination of the two companies which are described above. Alcan believes,
based on the information available to it, that as compared to Pechiney's current
situation, Pechiney's operations will be strengthened if the offers are
successful, particularly in the following areas:



     - greater options surrounding and access to primary materials,



     - better operating efficiency,



     - economies of scale resulting in reduced costs and increased
       competitiveness,



     - expanded research and development capacity and improvements in
       technology, and



     - an expanded range of products offered (especially in packaging).



In addition, the offers allow Pechiney shareholders to tender all or only a part
of their Pechiney shares in exchange for cash, thereby immediately benefiting
from the offers' premium over the pre-announcement price, and/or to receive
Alcan Common Shares and participate in the development of the combined entity
and the synergies that will be drawn from the combination.



Benefits to Customers.  The industries that Alcan and Pechiney serve are
themselves consolidating and becoming increasingly global in the scope of their
operations. Their global and regional customers are seeking financially stable,
full-service suppliers with the scale and regionally-based facilities required
to meet their needs. Following the transaction, the combined entity will be
better positioned to work with its customers on a global basis to address their
expanding needs by supplying them with existing products as well as by
efficiently developing new technologies and applications.


Aluminum customers will benefit from working with a company that has a
strengthened low-cost position, enhanced research and development and
technological capabilities and the capacity and geographic scope to address
customers' aluminum fabrication needs around the world.


Packaging customers will benefit from working with a company recognized as a
leading supplier in its key markets, with enhanced technological capability
allowing for improved product innovation and customer support.


                                        34


ANTICIPATED COST SYNERGIES FROM THE TRANSACTION


Alcan's management currently estimates that combining Alcan and Pechiney will
generate approximately $250 million in annual cost synergies, on a pre-tax
basis, that will be substantially achieved within two years of the completion of
the offers. By way of comparison, Alcan realized synergies of approximately $200
million per year, pre-tax, from the successful integration of algroup. Based on
this experience, as well as Alcan's experience with its cost reduction program
implemented in 2000, Alcan considers its synergy estimates for this transaction
to be realistic, although there can be no assurance that synergies ultimately
realized will not be higher or lower than this estimate, as discussed under
"Risk Factors" beginning on page 21. The synergies contemplated in connection
with this transaction represent approximately 3.8% of Pechiney's 2002 revenues,
excluding revenues from its International Trade segment. By way of comparison,
the synergies realized in the integration of algroup represented approximately
3.9% of algroup's 1998 revenues.



The cost synergies are expected to be achieved from (with the percentages of the
total estimated synergies in parentheses):



     - selling, general and administrative expenses (31%):  cost savings
       realized by combining corporate and head office services and trading,
       sales and distribution staff support services;



     - operations (15%):  operating cost savings realized through the
       optimization of production facilities and improvements to productivity;



     - logistics and purchasing (26%):  raw material, operating and capital cost
       savings realized through leveraging project management, purchasing
       requirements and supply chain issues on a larger scale;



     - research and development (12%):  research and development cost savings
       realized by focusing research facilities, technical services and
       information technology; and



     - capital expenditure programs (16%):  optimizing the timing and the
       sequence of investments available to Alcan and Pechiney to maximize
       shareholder returns on these investments.



Alcan's synergies estimates take into consideration the cost reductions realized
by Alcan since 2000, as well as the cost reductions realized by Pechiney since
January 1, 2002 through its Continuous Improvement System, which, according to
Pechiney, has achieved a total of over $200 million in cost reductions through
June 30, 2003.



In order to realize these synergies, Alcan currently estimates that within two
years of the completion of the offers it will incur approximately $200 million
in costs and make capital expenditures of approximately $50 million.


FINANCIAL RESOURCES FOR SUSTAINED GROWTH


Following the transaction, Alcan will have substantially greater financial
resources than either Alcan or Pechiney alone. Alcan and Pechiney had combined
pro forma 2002 total revenues of approximately $24 billion using the purchase
method of accounting under U.S. GAAP. See "Pro Forma Combined Financial
Statements of Alcan and Pechiney" beginning on page 85.



The transaction is anticipated to be accretive in year one to EBITDA, earnings
per share, free cash flow and return on capital employed. Looking forward, Alcan
also expects that the combined entity will meet or exceed Alcan's previously
announced targets of 15% compound annual growth in earnings per share and
minimum free cash flow of $400 million per year.



Upon completion of the transaction, the combined entity will have a
debt-to-total-capitalization ratio above Alcan's long-term target of 35%. On a
pro forma basis, the combined entity's debt-to-total-capitalization ratio at
June 30, 2003 was  45%. Alcan expects to be able to reduce this ratio to below
its target within three years while maintaining its financial flexibility to
assure Alcan's continued growth.


Alcan has also considered the potential adverse impact and risks of the
transaction, including the increased management attention that will be required
to integrate Pechiney, the costs and covenants associated with the

                                        35



bank facilities required to pay for the cash element of the offers'
consideration, the risks generally applicable with respect to an investment in
Pechiney and the risks associated with an unsolicited acquisition, including, in
particular, the impossibility of conducting the pre-acquisition due diligence,
and increased danger of difficulties with Pechiney's management and employees.
For a further discussion of these risks and uncertainties, please see "Risk
Factors" beginning on page 21 and the "Cautionary Statement Concerning
Forward-Looking Statements" on page 30.



COMMITMENTS OFFERED TO THE EUROPEAN COMMISSION TO OBTAIN REGULATORY APPROVAL



The completion of the offers and the subsequent combination of the businesses of
Alcan and Pechiney are subject to certain regulatory approvals, including, among
others, receipt of merger control approval from the European Commission. See
"Regulatory Matters" beginning on page 95.



In view of Alcan's experience in respect of the competition matters raised in
relation to the proposed APA transaction and the competition issues that the
offers may raise in certain European markets (notably certain flat-rolled
products, aluminum aerosol cans and aluminum cartridges), prior to making its
notification of the transaction to the European Commission on August 14, 2003,
Alcan held confidential preliminary discussions with the European Commission to
discuss the types of commitments that Alcan may need to offer in relation to
these markets in order for the European Commission to be able to approve the
transaction at the end of its initial ("Phase I") review of the transaction. On
August 18, 2003, Alcan formally made an offer of commitments to divest certain
European businesses, operations or assets of Alcan and/or Pechiney, to be
implemented by way of sale, demerger or other transaction of similar effect
within a relatively short period of time after the completion of the offers, in
relation to the European flat-rolled products, aluminum aerosol cans and
aluminum cartridges of Alcan and/or Pechiney.



In relation to flat-rolled products, Alcan has undertaken that (i) Alcan's
interest in AluNorf (a 50% interest in a rolling mill held through a joint
venture with Norsk Hydro ASA) and its Gottingen rolling mill and (ii) Pechiney's
rolling mills at Neuf-Brisach and Annecy, will not both be held under the common
ownership and control of Alcan. In relation to aluminum aerosol cans, Alcan has
undertaken that (i) Alcan's entire European aerosol can business, including
production facilities in France, Switzerland and the Netherlands and (ii)
Pechiney's entire European aerosol can business, including production facilities
in France, the United Kingdom, Spain, Italy and the Czech Republic, will not be
held under the common ownership and control of Alcan. In relation to aluminum
cartridges, Alcan has undertaken that (i) Alcan's European aluminum cartridges
business, including a production facility at Gottingen and (ii) Pechiney's
European cartridges business, including a production facility at Saumur, will
not be held under the common ownership and control of Alcan. Alcan believes that
these undertakings will resolve all possible competition concerns that the
transaction may raise in relation to the Western European markets of flat-rolled
products, aluminum aerosol cans and aluminum cartridges. However, there can be
no assurance that the European Commission will not require Alcan to modify these
undertakings, nor that the European Commission will accept these undertakings or
any modified undertakings. Furthermore, as the European Commission is still
investigating the effects of the transaction, there can be no assurance that
Alcan will not be required to offer additional commitments in relation to other
products markets.



Alcan anticipates that the businesses that will likely be subject to any of the
commitments described above represent approximately 4% to 5% of total pro forma
revenues (based on 2002 revenues).


EMPLOYMENT MATTERS

Alcan recognizes the value of Pechiney's employees. Alcan will strive to retain
Pechiney's critical human resources following completion of the transaction.


Industrial Operations.  Alcan has not had access to information sufficient to
enable it to clearly state its intentions with respect to Pechiney's work force
outside of France. Alcan does not currently intend to make material changes to
Pechiney's existing industrial workforce in France, beyond those that are
contemplated by Pechiney's current strategic restructuring plans and closure or
workforce reduction announcements. Alcan is committed to keeping both Alcan's
and Pechiney's employees' representatives informed throughout the offer

                                        36



process. Alcan has announced that its representatives are available to meet with
representatives of Pechiney's employees in the context of their evaluation of
the offers and Alcan's plans for the integration of the two companies.



Pechiney's Senior Management and Head Office.  Alcan hopes to maintain a key
decision center in Paris, although its activities and its size may be
significantly changed from those of Pechiney's current head office. Certain
business functions will no longer require as great a physical presence in Paris.
Alcan currently plans to maintain Pechiney's existing senior management team and
head office operations in place for a transitional period, after which Alcan
expects to be able to achieve significant cost synergies by rationalizing
Pechiney's corporate head office. Alcan intends, however, to locate the
headquarters of its global packaging and European primary aluminum businesses in
France. Alcan is also considering the possibility of establishing the global
headquarters of the combined entity's aerospace and engineered product group in
France.



Alcan knows and values the quality of Pechiney's senior management team and
hopes that a large number of Pechiney's executives will be involved in the
management of the combined entity. Alcan's integration of the management of
algroup is a tangible example of the success of the 1999 transaction, and
indicates the potential opportunities for Pechiney's employees. Alcan intends to
work with Pechiney's management team to maintain the continued efficient
operation of the companies' business.


If the offers are successfully completed, the structure of Pechiney's board of
directors will be modified to reflect Pechiney's new shareholder base.

CONTEMPLATED DIVIDEND POLICY

Pechiney Securities.  Alcan is not in a position at this stage to state what
Pechiney's dividend policy will be in respect of Pechiney securities remaining
outstanding after the offer, but it is likely that such policy will be
determined in the context of Pechiney's integration into the combined entity.
This policy could bring about a large reduction in the level of dividends paid
by Pechiney, or even an end to dividends being paid at all.


Alcan Common Shares.  The new Alcan Common Shares issued in connection with the
offer will have the same dividend and other rights as existing Alcan Common
Shares. In recent years, when Alcan has declared a quarterly dividend for the
fourth quarter of a fiscal year, such dividend has been paid on or about
December 20 to holders of record on a date established to be on or about
November 20 of that year. In the event that Alcan declares a fourth-quarter
dividend in 2003 and if the offers are successful but the settlement date falls
after the record date for the fourth-quarter dividend, then the Alcan Common
Shares delivered to you will not entitle you to receive that fourth-quarter
dividend.


  HISTORY OF ALCAN AND BACKGROUND OF THE OFFERS; PAST CONTACTS, TRANSACTIONS,
                          NEGOTIATIONS AND AGREEMENTS

The Proposed Alcan-Pechiney-algroup Three-way Combination


In September 1999, the Company entered into a three-way combination agreement
with Pechiney and algroup. The structure of the proposed combination involved
two independent offers of the Company's Common Shares, one for all of the
outstanding shares of Pechiney and the other for all of the outstanding shares
of algroup. On November 22, 1999, Alcan's shareholders approved the issuance of
Alcan Common Shares under the two independent offers.



The European Commission rejected the commitments that the parties offered to
remedy the competition issues identified by the European Commission with respect
to the combined APA entity's share of certain European markets (including
aluminum beverage can body and end stock, aluminum food can sheet and certain
packaging products) as in its view these offered commitments were inadequate to
resolve all competition concerns raised by the proposed APA transaction. The
European Commission issued a press release on March 14, 2000 that explained the
competition issues identified by it and the reasons for its rejection of the
commitments proposed by the parties.


                                        37



On March 13, 2000, following months of intensive work and negotiations with the
European and U.S. competition authorities, the three companies notified the
European Commission that they were withdrawing their notification of the
Pechiney related offer proposal and formally abandoned that proposal.


The offer by Alcan for the algroup shares was approved by the European
Commission on March 14, 2000, subject to certain divestitures. On October 17,
2000, the combination of Alcan and algroup was completed, with Alcan acquiring
over 99% of the shares of algroup pursuant to its offer. Alcan acquired the
remaining outstanding algroup shares in 2001, and caused algroup to be de-listed
from the SWX Swiss Exchange.

Alcan-Pechiney Relationships

Alcan, through its Australian subsidiary Alcan South Pacific Pty Limited, holds
a 21.4% equity interest in Queensland Alumina Limited ("QAL") in which Pechiney,
through its subsidiary Pechiney Resources Pty Limited, holds a 20% equity
interest. QAL operates an alumina refinery at Gladstone, Australia, as a
cooperative for the benefit of its shareholders. Each participant in the
refinery supplies bauxite for toll conversion into alumina.

Alcan and Pechiney respectively hold 33% and 10% of Halco (Mining) Inc., which
in turn holds 51% of Compagnie des Bauxites de Guinee ("CBG"), with the
remaining 49% held by the Republic of Guinea. CBG's mine in the Boke region of
Guinea has an operating capacity of about 12.7 million tonnes of bauxite a year.

Alcan's Alma smelter in Quebec, Canada uses Pechiney's electrolytic reduction of
alumina technology (AP-30) pursuant to a technology license agreement entered
into as of March 27, 1997. The Alouette smelter, also in Quebec, in which Alcan
recently acquired a total 40% interest, uses the same technology. Alcan's
smelter at Lochaber, Scotland uses an older Pechiney electrolytic reduction
technology (AP-18).


Alcan and Pechiney operate the Copal aluminum slug plant at Beaurepaire, France,
as a production joint venture. Each party provides its own aluminum for
processing at cost. These slugs are used in each party's respective aluminum
aerosol can production operations.


            CHRONOLOGY OF THE DECISION-MAKING PROCESS FOR THE OFFERS


On October 7, 2002, Mr. Engen, Alcan's President and Chief Executive Officer,
met Mr. Jean-Pierre Rodier, Pechiney's Chairman and Chief Executive Officer, in
Paris and discussed on an informal basis the interest each company might have in
a renewed combination transaction. The parties agreed to speak further.


On October 23, 2002, Pechiney and Corus Group plc ("Corus") announced that they
had agreed in principle on Pechiney's purchase of Corus' aluminum rolled
products and extrusions businesses. Pechiney's acquisition of this business
would have led to significant additional regulatory complications in an Alcan
combination with Pechiney.

On November 6, 2002, Messrs. Engen and Rodier met in London. Mr. Rodier stated
that Pechiney's current priority was the Corus acquisition and that,
consequently, Pechiney did not wish to continue discussions with Alcan on the
subject of a possible combination at that time.

On March 11, 2003, Corus announced that the supervisory board of Corus Nederland
NV, a subsidiary of Corus that owns Corus' aluminum businesses, had rejected the
sale of the aluminum rolled products and extrusions businesses to Pechiney.

On March 19, 2003, in light of the cancellation of the Corus acquisition,
Messrs. Engen and Rodier again met in Paris to explore the potential for an
Alcan-Pechiney combination. Mr. Rodier said that prior to entering into any
further discussions on the subject, he would bring the matter up at a meeting
with some of Pechiney's directors already scheduled for the following Saturday,
March 23, 2003.

Approximately one week after their March 19 meeting, Mr. Rodier telephoned Mr.
Engen and advised him that he believed that the time was not right for further
consideration of any combination.

                                        38


Mr. Engen reported on his meetings with Mr. Rodier at the March 27, 2003 and
April 24, 2003 meetings of the Alcan board of directors.

Beginning in May 2003, members of Alcan's management, assisted by advisors,
conducted a review of the feasibility of a transaction combining Alcan and
Pechiney. Alcan's management presented the results of its analysis and views
concerning the potential for an Alcan-Pechiney business combination to Alcan's
board of directors at a meeting held on June 3, 2003. At that meeting, Alcan's
board of directors requested additional information.

On June 5, 2003, a Goldman Sachs research analyst issued a report assigning
Pechiney shares an "outperform" rating, discussing Pechiney's attractiveness to
potential acquirers, focusing on Alcan as a potentially interested party and
stating that Pechiney could merit a value of at least E34 per share to an
acquirer. At the time Pechiney shares were trading at approximately E26 per
share.

On June 17, 2003, Reuters reported that Pechiney's Chairman and Chief Executive
Officer had commented on a combination of Alcan and Pechiney at an analysts'
presentation, stating, "today it would again be a good deal" but that he had no
reason to believe that the regulatory conditions set by competition authorities
would be different from those for the proposed APA transaction. At the time,
Pechiney shares were trading at approximately E29 per share.

Alcan's management made a presentation regarding a potential Alcan-Pechiney
transaction to Alcan's board of directors on June 26, 2003 at a
regularly-scheduled board meeting, to which Alcan's financial and legal advisors
were invited. This presentation reviewed the strategic rationale of the
transaction, initial findings from internal and external due diligence reviews,
and summaries of confidential discussions with the European Commission's Merger
Task Force.

Also on June 26, a Prudential Securities research analyst issued a report on
Alcan stating that the prior proposed Alcan-Pechiney merger could be as good or
better now than at the time of the proposed APA transaction.

On July 2, 2003, Alcan's board of directors held a meeting to discuss further
the potential combination and received additional input from Alcan's management.
After further review and discussion, the directors present unanimously provided
Mr. Engen with the discretion, at his election and with no obligation to act, to
determine and approve the terms of a transaction between Alcan and Pechiney
during the following 90 days, all within certain parameters discussed with the
board of directors.

On July 3, 2003, Mr. Engen's office arranged for a call with Mr. Rodier to be
scheduled for the following morning. Also on July 3, 2003, Reuters reported that
there were rumors concerning a potential tender offer for Pechiney by either
Alcan or Norsk Hydro, and Pechiney's share price rose from E32 to E33.70 on
higher than average volume.

On the morning of July 4, 2003 Mr. Engen spoke to Mr. Rodier and addressed the
developments in the trading markets for Pechiney shares, assured him that Alcan
was not, directly or indirectly, involved in any market purchases of any
Pechiney shares, and asked Mr. Rodier to meet with him that evening in Paris. At
the request of Mr. Rodier, the meeting was held at the offices of Pechiney's
attorneys.

At the July 4, 2003 meeting, Mr. Engen presented to Mr. Rodier the business case
for an Alcan-Pechiney combination, the changes in Alcan and Pechiney and the
aluminum and packaging industries since the proposed APA transaction, the
resulting change in Alcan's perspective which would now permit Alcan to commit
to certain undertakings to address competition concerns and his interest in
establishing the global headquarters of the combined packaging business in Paris
and in exploring the business logic relating to the possibility of establishing
the global headquarters of its aerospace and engineered products business in
Paris. Mr. Engen also discussed the protection Alcan would afford to Pechiney's
French industrial employees, establishing in France the research and development
headquarters for a new cell technology center, and his commitment to a
merit-based program to evaluate the management candidates in a combined company.
Mr. Engen emphasized the need to come to agreement before July 7, 2003, given
market speculation and

                                        39


recent movement in Pechiney's share price, his concern with respect to the legal
requirements and other pressures to disclose and Alcan's need to protect its
interests.

Mr. Rodier advised that he was not in a position to formally respond to Mr.
Engen but went over some of the difficulties Pechiney had endured as a result of
not being able to complete the proposed APA transaction. Mr. Rodier advised Mr.
Engen that Pechiney would have a negative reaction with respect to any
transaction that was subject to a competition regulatory approval condition.


Mr. Engen then presented for discussion the terms of a potential offer he was
considering on behalf of Alcan. That proposal was substantially the same as the
offers described herein. Mr. Rodier indicated that it would be necessary to
consider the duties to Pechiney shareholders, employees and customers to
determine whether the proposal was the best deal for Pechiney and its
stakeholders. He requested several weeks to consider the proposal. Mr. Engen
raised the issues around Alcan's impending disclosure requirement and asked if
they could continue their discussions the next day. Mr. Rodier agreed to meet
him Saturday afternoon.


On July 5, 2003, Mr. Engen met with Mr. Rodier at the offices of Publicis,
Alcan's communications firm, in Paris. Mr. Engen explained his understanding of
the timeframe related to the European Commission regulatory process, the
timeframe associated with a public tender offer process and the process and
timing for review of a public tender offer for Pechiney by Pechiney's management
and board of directors. Mr. Engen and Mr. Rodier together discussed the timeline
for a potential Alcan offer. Mr. Engen again expressed his concerns regarding
the potential need to disclose the Alcan-Pechiney discussions given market
speculation and other factors. Mr. Engen also expressed the need promptly to
commence the competition regulatory review in order to clarify the undertakings
required and permit the resolution of Alcan's and Pechiney's concerns in light
of each company's difficult experiences during the proposed APA transaction.

Mr. Rodier discussed the potential difficulties of the competition review
process. When asked by Mr. Engen, he indicated that informal discussions among
Pechiney's directors had begun. Mr. Rodier further indicated that the three key
criteria in assessing the merits of any offer would be price, the views of
Pechiney's key managers with respect to potential acquirers of Pechiney and
competition and antitrust issues.

After further discussion, Mr. Engen advised Mr. Rodier that Alcan might issue a
press release as early as Monday morning Paris time, on July 7, 2003, but was
clear that no final decision had yet been made.

On July 6, 2003, Mr. Engen discussed with members of the Alcan Executive
Committee his views with respect to the terms and conditions of the offers and
his decision to proceed with an announcement and filing of the offers on July 7,
2003.


                        FINANCIAL ANALYSIS OF THE OFFERS



Under French law and regulations applicable to the French offer, the French
information memorandum relating to the French offer must include a description
of the financial terms of the offers using a multi-criteria analysis. Morgan
Stanley & Co. International Ltd. and Lazard Freres Banque, as presenting banks
for the French offer, prepared such analysis. Since this analysis has been made
available to those Pechiney securityholders eligible to participate in the
French offer in the French information memorandum, a translation of the analysis
is included in this prospectus. The analysis was performed solely to comply with
French regulations in connection with the preparation of the information
memorandum for the French offer and was not prepared with a view towards
disclosure in other jurisdictions. This analysis was not relied on in any way by
Alcan in its discussions with Pechiney or in connection with establishing the
consideration offered in this offer. In addition, this analysis does not
constitute an opinion of Morgan Stanley or Lazard Freres regarding the fairness
of the consideration offered in this offer from a financial point of view or
otherwise and is not intended to and does not constitute a recommendation to any
Pechiney securityholders with respect to the offers. Moreover, neither Morgan
Stanley nor Lazard Freres has made any independent valuation or appraisal of the
assets or liabilities of Alcan or Pechiney, nor has Morgan Stanley or Lazard
Freres been furnished with any such appraisals.


                                        40



The following is a translation from French of the original disclosure regarding
the analysis of the offers set forth in the information memorandum for the
French offer.


In this analysis, the term "Principal Offer" means the offer to exchange Alcan
Common Shares and cash for Pechiney Common Shares, the term "Cash Offer" means
the offer to exchange cash for Pechiney Common Shares, and the term
"Share-Exchange Offer" means the offer to exchange Alcan Common Shares for
Pechiney Common Shares, all on the terms described in this prospectus.

ASSESSMENT OF THE OFFER PRICE FOR PECHINEY SHARES

The consideration proposed in the Principal Offer, the Cash Offer and the
Share-Exchange Offer has been assessed through a multicriteria analysis based on
customary valuation methods.


The principal sources of information and assumptions retained for the purpose of
this valuation are presented. Morgan Stanley and Lazard Freres relied upon the
accuracy and completeness of the information obtained from the sources referred
to in this analysis and did not assume any responsibility for any independent
verification of such information or any independent valuation or appraisal of
any of the assets or liabilities of Alcan or Pechiney or concerning the solvency
of or issues relating to solvency concerning Alcan or Pechiney.


I.1.1 PRELIMINARY INFORMATION

I.1.1.1 KEY FINANCIAL METRICS


The financial metrics used to assess the terms and conditions of the offer are
derived from the consolidated financial statements of Alcan and Pechiney for the
years 2000, 2001 and 2002.



Regarding each of Alcan and Pechiney, these financial statements have been
prepared based on generally accepted accounting principles ("GAAP") of their
respective countries (i.e., Canadian GAAP and French GAAP, respectively).
However, where comparing Alcan's and Pechiney's financial metrics, the items
used are those prepared in accordance with a common accounting standard (U.S.
GAAP) as disclosed in the financial statements of each company.


I.1.1.2 NUMBERS OF SHARES


The earnings per share presented in this analysis have been calculated using a
fully diluted number of shares based on the "treasury stock" method. Under this
method, it is assumed that the cash coming from the exercise of options is
entirely used to buy back shares on the market, at a price equal to the average
share price of the stock during the period, thus diminishing the number of
shares that is then used for calculation on a fully diluted basis. This method
takes into account convertible bonds, as the case may be, assuming that they are
converted into shares.


Net book value per share in this analysis is calculated using the total number
of shares outstanding at the end of each period.

                                        41


The table below summarizes the number of shares used for Alcan and Pechiney in
both cases:




                                                               PECHINEY       ALCAN
                                                              ----------   -----------
                                                                     
NET EARNINGS PER SHARE(1)
Average number of shares in 2002............................  78,520,814   322,423,189
Average number of shares in 2001............................  79,667,263   321,287,219
Average number of shares in 2000............................  80,729,120   249,077,756
NET BOOK VALUE PER SHARE(2)
Number of shares as of 12/31/2002...........................  77,796,745   321,470,298
Number of shares as of 12/31/2001...........................  78,071,526   320,901,748
Number of shares as of 12/31/2000...........................  79,438,879   317,921,113



---------------


Source : Consolidated annual financial reports.



(1) Per Pechiney Common Share.



(2) Per Pechiney Common Share and Pechiney Preferred Share "B" excluding
    treasury stock.


I.1.1.3 EXCHANGE RATES


Due to the importance of the New York Stock Exchange (NYSE) and given the volume
of Alcan Common Shares traded on the NYSE, the share prices referred to for
Alcan are the NYSE share prices. The share prices and financial metrics for
Alcan, initially in U.S. dollars, have been converted into euros.



The average U.S. $/E exchange rates for the years 2000, 2001 and 2002 have been
utilized to convert the earnings per share and the net dividends of Alcan for
these periods. Book value conversions have been based on year-end rates.


The following table summarizes the exchange rates used in both cases:




                                                                           END OF
U.S. $/E EXCHANGE RATES                                       AVERAGE      PERIOD
-----------------------                                       -------   -------------
                                                                  
Fiscal year 2002............................................   0.95         1.05
Fiscal year 2001............................................   0.90         0.89
Fiscal year 2000............................................   0.92         0.94



---------------


Source: Datastream.


I.1.2 ASSESSMENT OF THE PRINCIPAL OFFER


For 5 Pechiney Common Shares tendered, 3 Alcan Common Shares and E123 in cash
will be given.



Since July 4, 2003 was a bank holiday in the United States of America, the
reference stock price chosen for Alcan is the closing price on the NYSE as of
July 3, 2003. Based on this price of U.S. $31.46 and on a E/U.S. $ exchange rate
of 1.15 ("noon buying rate"), the implied value of the Principal Offer equals
E41 (i.e., (3 X 31.46 / 1.15 + 123) / 5) for each Pechiney share.



It must also be noted that Pechiney's share price was affected on July 3, 2003
by market rumors on a potential take-over of Pechiney. The stock increased by
5.4% on that day compared to a flat index (SBF 120: +0.43%).



In order to assess the implicit value of the Principal Offer immediately prior
to the filing of the offers, two reference dates have been used: July 3, 2003
for Alcan's share price and July 4, 2003 for Pechiney's share price. However,
for both companies, the reference date used for all comparisons will be July 2,
2003 (the last date for unaffected prices for Pechiney). All the average share
prices, as of July 2, 2003, presented in this analysis are volume-weighted
averages. Alcan share prices have been converted into euros on a day-to-day
basis. Volumes used for the computation of Alcan's share price average are those
observed on the NYSE. The implicit premiums of the Principal Offer were
calculated assuming that the mix of Alcan Common Shares and


                                        42



cash consideration had been owned by a Pechiney securityholder at each of the
reference dates. The value of the share portion of the Principal Offer therefore
varies depending upon the Alcan Common Share price at each reference date.





                                      PECHINEY            ALCAN          IMPLIED VALUE
                                    (EUROS/SHARE)     (U.S. $/SHARE)          (E)           PREMIUM
                                  -----------------   --------------   ------------------   -------
                                                                                
Last quoted price (July 4,
  2003).........................        34.0               31.5(2)            41.0           20.5%
Last quoted price before rumors
  (July 2, 2003)................        32.0               31.6               41.0           28.3%
5-day average(1)................        31.1               31.3               41.0           31.7%
1-month average(1)..............        29.6               31.7               40.9           38.4%
3-month average(1)..............        26.8               30.2               40.6           51.7%
6-month average(1)..............        26.4               29.5               40.7           54.3%
12-month average(1).............        30.7               28.9               41.5           35.1%



---------------


Source: Datastream.



(1) Through July 2, 2003.



(2) As of July 3, 2003.



The implied value for the Principal Offer (i.e., E41 per Pechiney Common Share)
is consistent with the price of the Cash Offer (E41 per Pechiney share).
Moreover, using the same references, the implicit exchange ratio for the Share
Exchange Offer is 1.5 (i.e., 41.0 X 1.15/31.46) and is also consistent with the
exchange ratio of the Share-Exchange Offer (i.e., 3 Alcan Common Shares for 2
Pechiney Common Shares).


Consequently, the terms and conditions of the Principal Offer may be assessed
based on the same criteria as the Cash Offer on the one hand and the
Share-Exchange Offer on the other hand.

I.1.3 ASSESSMENT OF THE CASH OFFER


The Cash Offer price of E41 per Pechiney share may be assessed as follows:


I.1.3.1 MARKET VALUES


The table below indicates the implicit premiums of the Cash Offer based on (i)
the last quoted share price for Pechiney before the filing of the offer, i.e.,
July 4, 2003, (ii) the day prior to Pechiney's share price becoming affected by
the July 3, 2003 rumors, i.e., July 2, 2003, and (iii) historical share price
averages calculated as of July 2, 2003. The implicit premiums of the Cash Offer
were calculated using the price of E41 per share value.





                                                                PECHINEY
                                                              (EUROS/SHARE)   PREMIUM
                                                              -------------   -------
                                                                        
Last quoted price (July 4, 2003)............................      34.0         20.5%
Last quoted price before rumors (July 2, 2003)..............      32.0         28.1%
5-day average(1)............................................      31.1         31.8%
1-month average(1)..........................................      29.6         38.6%
3-month average(1)..........................................      26.8         53.1%
6-month average(1)..........................................      26.4         55.4%
12-month average(1).........................................      30.7         33.4%



---------------


Source: Datastream.



(1) Through July 2, 2003.


                                        43



I.1.3.2 BOOK VALUE PER SHARE



The price of E41 per Pechiney Common Share corresponds to a premium of 5.8% on
Pechiney's book value per share before appropriation at December 31, 2002. Based
on Pechiney's book value after appropriation, the price of E41 per Pechiney
Common Share corresponds to a premium of 8.7%.



I.1.3.3 ANALYSIS OF COMPARABLE COMPANIES



The companies in the aluminum industry are customarily valued on the basis of
their EBITDA (defined as the enterprise value divided by earnings before
interest, taxes, depreciation and amortization). The enterprise value is the sum
of the equity market value, plus financial debt, plus minority interests and
minus cash and cash equivalents.


The Cash Offer's implicit EBITDA multiple may be compared to that of Alcan and
Alcoa, two key listed players in the aluminum sector. Their multiples are
presented in the table below:




                       SHARE PRICE AS OF      MARKET                                         2002 EBITDA   2002 EBITDA
                        JULY 2, 2003(1)    EQUITY VALUE   ENTERPRISE VALUE   2002 REVENUES     MARGIN       MULTIPLE
                              (E)          (E BILLION)      (E BILLION)       (E BILLION)        (%)           (X)
                       -----------------   ------------   ----------------   -------------   -----------   -----------
                                                                                         
Alcoa................        22.2              18.8             31.0             21.4           13.1%         11.7x
Alcan................        27.4               8.8             14.2             13.2           14.3%          7.9x
Pechiney.............        32.0               2.5              4.1             11.9            6.4%(2)       5.4x
OFFER PRICE IMPLICIT
  MULTIPLE...........        41.0               3.2              4.8             11.9            6.4%(2)       6.3X



---------------


Sources: Consolidated financial statements, Datastream.



Notes:



(1) Last trading day before rumors.



(2) The EBITDA margin, excluding trading activities, is estimated at 9.9%.


The following items should be taken into account:


     - Alcoa is the worldwide leader for aluminum in most key market segments.
       Its revenues for 2002 amounted to E21.4 billion vs. E11.9 billion for
       Pechiney (and E6.9 billion excluding trading activities). The
       profitability of Alcoa, defined as the EBITDA margin, amounted to 13.1%
       in 2002, compared to 6.4% for Pechiney. This information is derived from
       Alcoa's Annual Reports on Form 10-K for the years ended December 31, 2002
       and December 31, 2001.



     - Alcan is more comparable to Pechiney in terms of size (E13.2 billion in
       revenues for 2002). Alcan's profitability of 14.3% differs materially
       from that of Pechiney (6.4%), and Alcan's EBITDA growth of 20% over
       2000-2002 differs materially compared to a decrease of EBITDA by 21% for
       Pechiney over the same period.



     - Over the last three years, Pechiney has traded at a discount to the
       multiples of Alcoa and Alcan. An analysis performed on a quarterly basis
       indicates that the EBITDA multiple of Pechiney was on average 30% below
       the average multiple of Alcan and Alcoa over the same period.



Based on the reference unaffected share price of Pechiney on July 2, 2003 and of
the accounts as of December 31, 2002, the company was trading at a multiple of
5.4x EBITDA for 2002. The Cash Offer price of E41.0 per Pechiney share
corresponds to an implicit EBITDA multiple for 2002 of 6.3x, i.e., 17.3% above.
It represents a discount of 20.3% and 45.9% on the respective multiples of Alcan
and Alcoa.



I.1.3.4 ANALYSIS OF PRECEDENT TRANSACTIONS


This analysis consists of comparing the implicit EBITDA multiple of the Cash
Offer, i.e., 6.3x for Pechiney, with the multiples observed on a selection of
transactions that took place in the sector since 1998.

                                        44



It must be noted that an analysis of such multiples offered in transactions
should take into account the cycle of the aluminum industry at any given time,
the key markets in which Pechiney participates and the market conditions
prevailing at the time of such transactions. Each transaction is, by definition,
specific and the prices offered for each transaction take into account the
dynamics of each transaction, the expected synergies and the pre-transaction
level of valuation of each company at the time of the transactions.


Subject to these conditions, the results of the analysis of precedent
transactions are summarized in the table below:




                                                           MULTIPLE OF
                                                         TRAILING FISCAL      IMPLICIT
                                                              YEAR         PREMIUM OF THE
DATE                             TARGET     ACQUIRER     EBITDA MULTIPLE   OFFER MULTIPLE
----                            --------   -----------   ---------------   --------------
                                                               
August 2002...................      Sapa         Elkem        5.4x
January 2002..................       VAW   Norsk Hydro        5.5x
-----------------------------------------------------------------------------------------
February 2000.................   Comalco     Rio Tinto        8.2x
August 1999...................   algroup         Alcan        9.5x
August 1999...................  Reynolds         Alcoa        8.9x
March 1998....................    Alumax         Alcoa        8.5x
-----------------------------------------------------------------------------------------
2002 TRANSACTIONS AVERAGE.....                                5.5X              14.6%
1998-2000 TRANSACTIONS
  AVERAGE.....................                                8.7X             (28.3)%
HIGHEST.......................                                9.5X             (33.7)%
LOWEST........................                                5.4X              16.7%



---------------


Sources: Consolidated financial statements, offer documents, press releases and
Datastream.


The Cash Offer's implicit multiple corresponds to a premium of 16.7% compared to
the transaction with the lowest multiple (VAW/Norsk Hydro, August 2002) and a
discount of 33.7% compared to the transaction with the highest multiple
(Reynolds/Alcoa, August 1999). The implicit multiple of the Cash Offer is at a
discount of 28.3% compared with the average multiple for 1998-2000 transactions
but at a premium of 14.6% compared with the average multiple for most recent
transactions that took place in 2002.

In addition to the precedent transactions multiples analysis, the table below
summarizes the premiums to market prices observed at the time of such
transactions. These premiums are based on the average prices for the month
preceding the announcement of each transaction.




                                                                          PREMIUM TO
                                                                            1-MONTH
DATE                                          TARGET     ACQUIROR     SHARE PRICE AVERAGE
----                                         --------   -----------   -------------------
                                                             
August 2002................................      Sapa         Elkem           1.7%
January 2002...............................       VAW   Norsk Hydro            NA(1)
February 2000..............................   Comalco     Rio Tinto          21.7%
August 1999................................   algroup         Alcan          10.3%
August 1999................................  Reynolds         Alcoa          21.7%
March 1998.................................    Alumax         Alcoa          37.9%
AVERAGE....................................                                  18.7%



---------------


Sources: offer documents, press releases and Datastream.



(1) Not available.



The average premium observed in the selection above is 18.7% and may be compared
to the implicit premium of the Cash Offer for Pechiney Common Shares (38.6%,
i.e., 2.1 times higher) based upon a 1-month share price average ending on July
2, 2003.


                                        45


I.1.3.5 SUMMARY ASSESSMENT OF THE CASH OFFER




CRITERION                                                         PREMIUM
---------                                                         -------
                                                           
SHARE PRICE
Last quoted share price (July 4, 2003)......................       20.5%
Last quoted price before rumors (July 2, 2003)..............       28.1%
5-day average(1)............................................       31.8%
1-month average(1)..........................................       38.6%
3-month average(1)..........................................       53.1%
6-month average(1)..........................................       55.4%
12-month average(1).........................................       33.4%
COMPARABLE COMPANIES ANALYSIS
Implicit 2002 EBITDA multiple...............................  (45.9)%/(20.3)%
PRECEDENT TRANSACTIONS ANALYSIS
Implicit EBITDA(2) multiple.................................   (33.7)%/16.7%
NET BOOK VALUE OF ASSETS
Fiscal year 2002............................................       5.8%



---------------


(1) Through July 2, 2003.


(2) EBITDA as of last annual consolidated financial statements before
transaction.


I.1.4 ASSESSMENT OF THE SHARE-EXCHANGE OFFER


The exchange ratio proposed in the Share-Exchange Offer, i.e., 3 Alcan Common
Shares for 2 Pechiney Common Shares (or a ratio of 1.5) may be assessed as
follows:


I.1.4.1 MARKET VALUES

In order to assess the implicit value of the Share-Exchange Offer just before
the filing of the Offer, two references have been used: July 3, 2003 for Alcan's
share price and July 4, 2003 for Pechiney's share price. However, for both
companies, the reference date used for all comparisons will be July 2, 2003 as
being the last date for unaffected prices for Pechiney. All the average share
prices, as of July 2, 2003, presented below are volume-weighted averages. Alcan
share prices have been converted into euros on a day-to-day basis. Volumes used
for the computation of Alcan's share price average are those observed on the
NYSE.




                                                                             IMPLICIT
                                              PECHINEY          ALCAN         VALUE
                                            (EUROS/SHARE)   (U.S. $/SHARE)     (E)      PREMIUM
                                            -------------   --------------   --------   -------
                                                                            
Last quoted price (July 4, 2003)..........      34.0             31.5(2)       41.0      20.5%
Last quoted price before rumors (July 2,
  2003)...................................      32.0             31.6          41.1      28.5%
5-day average(1)..........................      31.1             31.3          40.9      31.5%
1-month average(1)........................      29.6             31.7          40.9      38.1%
3-month average(1)........................      26.8             30.2          40.1      49.6%
6-month average(1)........................      26.4             29.5          40.2      52.5%
12-month average(1).......................      30.7             28.9          42.3      37.5%



---------------


Source: Datastream.



(1) Through July 2, 2003.


(2) As of July 3, 2003.


                                        46


I.1.4.2 EARNINGS PER SHARE


The table below presents the levels of premiums calculated on the basis of the
ratio between the consolidated group net income per Pechiney Common Share and
per Alcan Common Share for the fiscal years 2000, 2001 and 2002. Pechiney's net
earnings per share refers to net earnings per Pechiney Common Share.





                                                                           PECHINEY/ALCAN
                         PECHINEY          ALCAN        AVERAGE EXCHANGE      EXCHANGE
                       (EUROS/SHARE)   (U.S. $/SHARE)   RATE (U.S. $/E)        RATIO         PREMIUM
                       -------------   --------------   ----------------   --------------   ----------
                                                                             
Fiscal year 2002.....      (0.07)          (1.06)             0.95                NM(1)         NM(1)
Fiscal year 2001.....       2.42           (0.19)             0.90                NM(1)         NM(1)
Fiscal year 2000.....       3.88            2.40              0.92              1.49           0.5%



---------------

Sources: Consolidated financial statements and Datastream.



(1) Not meaningful


I.1.4.3 BOOK VALUE PER SHARE.


The table below presents the levels of premiums calculated on the basis of the
ratio between the consolidated group book value after appropriation per Pechiney
share and per Alcan Common Share for the fiscal years 2000, 2001 and 2002.
Pechiney's book value per share refers to book value per Pechiney Common Share
and Pechiney Preferred Share "B."





                                                           AVERAGE
                         PECHINEY          ALCAN        EXCHANGE RATE   PECHINEY/ALCAN
                       (EUROS/SHARE)   (U.S. $/SHARE)    (U.S. $/E)     EXCHANGE RATIO    PREMIUM
                       -------------   --------------   -------------   --------------   ----------
                                                                          
Fiscal year 2002.....      36.4             25.7            1.05             1.48            1.1%
Fiscal year 2001.....      40.4             26.2            0.89             1.37            9.4%
Fiscal year 2000.....      39.0             27.2            0.94             1.34           11.6%



---------------

Sources: Consolidated financial statements and Datastream.


I.1.4.4 NET DIVIDENDS


The table below presents the levels of premiums determined on the basis of the
ratio between net dividend per Pechiney Common Share published by Pechiney and
that per Alcan Common Share published by Alcan for the fiscal years 2000, 2001
and 2002.





                                                            AVERAGE        PECHINEY/ALCAN
                         PECHINEY          ALCAN         EXCHANGE RATE        EXCHANGE
                       (EUROS/SHARE)   (U.S. $/SHARE)      (U.S. $/E)          RATIO         PREMIUM
                       -------------   --------------   ----------------   --------------   ----------
                                                                             
Fiscal year 2002.....      1.00             0.60              0.95              1.58           (4.8)%
Fiscal year 2001.....      1.00             0.60              0.90              1.49            0.5%
Fiscal year 2000.....      1.00             0.60              0.92              1.54           (2.5)%



---------------

Sources: Consolidated financial statements and Datastream.


                                        47


I.1.4.5 SUMMARY ASSESSMENT OF THE SHARE-EXCHANGE OFFER




CRITERION                                                      PREMIUM
---------                                                      -------
                                                            
SHARE PRICE
Last quoted share price (July 4, 2003)......................    20.5%
Last quoted price before rumors (July 2, 2003)..............    28.5%
5-day average(1)............................................    31.5%
1-month average(1)..........................................    38.1%
3-month average(1)..........................................    49.6%
6-month average(1)..........................................    52.5%
12-month average(1).........................................    37.5%
NET GROUP EARNINGS PER SHARE
Fiscal year 2002............................................      NM(2)
Fiscal year 2001............................................      NM(2)
Fiscal year 2000............................................     0.5%
NET BOOK VALUE OF GROUP ASSETS
Fiscal year 2002............................................     1.1%
Fiscal year 2001............................................     9.4%
Fiscal year 2000............................................    11.6%
NET DIVIDEND
Fiscal year 2002............................................    (4.8)%
Fiscal year 2001............................................     0.5%
Fiscal year 2000............................................    (2.5)%



---------------


(1) Through July 2, 2003.


(2) Not meaningful.



I.1.5.  ASSESSMENT OF THE OFFER FOR PECHINEY BONUS ALLOCATION RIGHTS



Pechiney's extraordinary shareholder meeting held on April 3, 2003 adopted a
draft resolution preparing the way for the conversion of the 1,091,040 Pechiney
Preferred Shares "B" into Pechiney Common Shares. The special assembly of
Pechiney Preferred Shares "B" shareholders, meeting on May 27, 2003, approved
the following resolution: "The special assembly of Pechiney Preferred Shares "B"
shareholders, considering the applicable law and the project resolution
submitted to the mixed shareholder assembly, approves of the conversion of
1,091,040 Pechiney Preferred Shares "B" into Pechiney Common Shares on the basis
of 11 Pechiney Common Shares, with full rights attached as of January 1st, 2003,
for every 10 Pechiney Preferred Shares "B"."



Each Pechiney Preferred Share "B" has therefore been automatically converted
into one Pechiney Common Share and the right to a 0.10 additional Pechiney
Common Shares.



The terms of the offer made for Pechiney Common Shares are identical to the
terms of the offer made for Pechiney Bonus Allocation Rights, with a 10 to 1
ratio (as each Pechiney Bonus Allocation Right leads to the attribution of 0.10
Pechiney Common Shares, 10 Pechiney Bonus Allocation Rights being required to
acquire one Pechiney Common Share). Consequently, the assessment of the offer
for Pechiney Bonus Allocation Rights is identical to the assessment of the offer
for Pechiney Common Shares.


                                        48



ASSESSMENT OF THE OFFER PRICE FOR PECHINEY OCEANES


II.1.1 PECHINEY OCEANE MAIN CHARACTERISTICS


On April 11, 2002, Pechiney issued a bond, due 2007 (maturity on January 1,
2007), convertible into new Pechiney Common Shares and/or exchangeable for
existing Pechiney Common Shares, represented by 7,908,636 bonds of E75.25
nominal value each and bearing interest at a rate of 1.25% per annum (i.e.,
E0.94 coupon payable in arrears on January 1st of each year). Bonds are
redeemable at a price of E82.81 per bond on the maturity date.



The Pechiney OCEANE gross yield to maturity stands at 3.25% as at the issue date
unless previously converted, exchanged, or redeemed.



Each Pechiney OCEANE could initially be converted or exchanged into one Pechiney
Common Share. Since the conversion of Pechiney Preferred Shares "B" into
Pechiney Common Shares (i.e., class A) was approved on May 27, 2003, each
Pechiney OCEANE can be converted or exchanged into 1.001 Pechiney Common Shares
for each bond, as defined in the section "maintenance of bondholders' rights" of
the Pechiney OCEANEs prospectus referred to in the next paragraph. The
conversion option can be exercised at any time from May 21, 2002. In addition,
Pechiney also has the option to redeem the bonds prior to maturity:



- In whole or in part, by way of tender offer or buy-back on Euronext Paris or
  otherwise;


- For the outstanding bonds, in whole but not in part, at any time on or after
  January 1, 2005 until the 7th working day prior to the redemption date (i.e.,
  December 20, 2006) at a price representing for the holders a yield to maturity
  identical to that applicable in the case of redemption on the maturity date
  (i.e., 3.25%) if the arithmetic mean of the closing prices for the shares on
  the Premier Marche of Euronext Paris during 20 consecutive trading days chosen
  by Pechiney during the 40 trading days immediately preceding the date of
  publication of the notice calling the bonds for redemption, multiplied by the
  number of shares then issuable upon conversion or deliverable upon exchange of
  one bond is greater than 130% of the early redemption price defined above;

- for the outstanding bonds, in whole but not in part at the redemption price
  defined above, if the number of outstanding bonds is less than 10% of the
  number of bonds originally issued.


A prospectus describing the Pechiney OCEANEs was approved by the Commission des
operations de bourse on April 3, 2002 under the visa number 02-306. An
unofficial translation of the prospectus is included as Exhibit 2 to Pechiney's
2002 20-F.



II.1.2 OFFER PRICE FOR THE PECHINEY OCEANES



The offer price per Pechiney OCEANE is E81.7. This price compares to the
analysis described in the following paragraphs:


II.1.2.1 CONVERSION VALUE


The conversion value for the Pechiney OCEANEs is determined by multiplying the
conversion ratio (i.e., 1.001) by the offer price for a Pechiney Common Share of
E41. As a result, the conversion value is E41.04.



The offer price for a Pechiney OCEANE represents a 99.1% premium over the
conversion value.


                                        49


II.1.2.2 TRADING PRICE


The offer price for the Pechiney OCEANE compares to the Pechiney OCEANE
historical trading prices as follows:





                                                                 PECHINEY
                                                                  OCEANE       PREMIUM
                                                              --------------   -------
                                                              (EUROS/OCEANE)     (%)
                                                                         
Closing price (July 4, 2003)................................       76.6          6.7%
Closing price before rumors (July 2, 2003)                         76.4          7.0%
5-day average(1)............................................       76.4          6.9%
1-month average(1)..........................................       76.2          7.2%
3-month average(1)..........................................       74.2         10.0%
6-month average(1)..........................................       72.4         12.8%
1-year average(1)...........................................       70.5         15.9%



---------------


Source: Bloomberg Generic Price (BGN).



(1) Through July 2, 2003.


II.1.2.3 YIELD TO MATURITY

At the offer price for the Pechiney OCEANE, the implied yield to maturity for a
bondholder as from the issue date (April 11, 2002) to the tender offer date
(July 7, 2003) stands at 7.61%.


The yield to maturity based on the offer price is 2.34 times greater than the
one offered to a bondholder at the issue date (i.e., 3.25%) before conversion,
exchange or early redemption.


II.1.2.4 THEORETICAL VALUE


The theoretical value of the Pechiney OCEANE has been determined in relation to
the offer price for the Pechiney Common Shares (i.e., E41).



The value of the Pechiney OCEANE presented herein has been calculated using a
valuation model based on the Cox, Ross & Rubinstein method and according to the
market conditions prevailing on July 4, 2003. The following assumptions have
been used:



1.  Share price of Pechiney Common Share: E41.



2.  Discount rate: 3.99% based on the interpolated euro swap curve for identical
    maturities increased by a margin of 1.30%, reflecting Pechiney's credit
    spread as most currently assumed by investors ("Credit Default Swaps" or
    "Asset Swaps").



3.  Stock borrow: 0.50% (annual cost).



4.  Dividend per share: E1 per share (dividend paid per Pechiney Common Share
    "A" with respect to the 2002 fiscal year).



5.  Volatility of Pechiney Common Share: 55.8% based on the 100-day historical
    share price volatility at the tender offer date.



The computed value using the above assumptions stands at E81.70; the offer price
per Pechiney OCEANE being equal to this value.



Using identical assumptions and a share price for each Pechiney Common Share of
E34.0 (closing price on July 4, 2003), the theoretical value per Pechiney OCEANE
would stand at E79.4. The offer price of E81.7 implies a 2.9% premium over the
theoretical value on July 4, 2003.


                                        50



Using identical assumptions and a share price for each Pechiney Common Share of
E32 (closing price on July 2, 2003), the theoretical value per Pechiney OCEANE
would stand at E78.8. The offer price of E81.7 implies a 3.7% premium over the
theoretical value on July 2, 2003.


II.1.2.5 SUMMARY




CRITERIA                                                      PREMIUM
--------                                                      -------
                                                           
CONVERSION VALUE
Conversion value based on the tender offer price............   99.1%
TRADING PRICE
Closing price (July 4, 2003)................................    6.7%
Closing price before rumors (July 2, 2003)..................    7.0%
5-trading day average(1)....................................    6.9%
1-month average(1)..........................................    7.2%
3-month average(1)..........................................   10.0%
6-month average(1)..........................................   12.8%
12-month average(1).........................................   15.9%
THEORETICAL VALUE
Value as of July 4, 2003....................................    2.9%
Value as of July 2, 2003....................................    3.7%



---------------


(1) Through July 2, 2003


                           SOURCE AND AMOUNT OF FUNDS


If all of the existing Pechiney Common Shares, Pechiney Bonus Allocation Rights,
Pechiney OCEANEs and Pechiney ADSs are tendered into the offers (including
Pechiney Common Shares issuable upon exercise of all outstanding Pechiney stock
options and treasury stock held by Pechiney), we expect to pay approximately
E2.7 billion in cash to holders of Pechiney securities. This amount will be
lower if less than 100% of the currently outstanding Pechiney Common Shares,
Pechiney Bonus Allocation Rights, Pechiney OCEANEs and Pechiney ADSs are
tendered in the offers. The amount also may vary depending upon the number of
Pechiney securities outstanding at the time of the closing of the offers. In
addition, we currently expect to pay approximately $92 million to cover expenses
incurred in connection with the offers, including expenses related to the
financing of the offer consideration. We also may be required to refinance a
yet-to-be-defined principal amount of indebtedness of Pechiney and its
subsidiaries as well as potentially certain indebtedness of ours that we would
otherwise have expected to renew shortly. In connection with this transaction,
we expect to enter into a bridge credit facility permitting borrowing in the
amount of up to $4 billion, which will be used to finance the acquisition of the
Pechiney securities pursuant to the offers and to refinance certain debt of
Pechiney.



Under the terms of a credit agreement that we have entered into with Morgan
Stanley Senior Funding (Nova Scotia) Co., this bank and its parent entity,
Morgan Stanley Senior Funding, Inc., have agreed to underwrite the new bridge
credit facility prior to completion of the offers, subject to certain
conditions.



The credit agreement states that the credit facility will be in the form of a $4
billion 364-day senior bridge term facility that will be used to finance the
acquisition of the Pechiney securities pursuant to the offers and to refinance
certain debt of Pechiney. The bridge term facility will be made available to us
immediately upon the point at which all of the conditions to the offers have
been satisfied and all regulatory approvals or clearances have been obtained.
Borrowings under the bridge term facility will be available in U.S. dollars and,
subject to availability in the London market, in euros. Alcan may refinance this
debt through a variety of means, including from proceeds received in connection
with the sale of assets, the issuance of equity or equity-linked securities, the
issuance of debt securities or substitute bank facilities.


                                        51



The applicable margin varies for the bridge credit facility according to its
utilization and the credit rating assigned to Alcan at the relevant time, and
ranges from 0.375% per annum to 1.75% per annum. From the effective date, we
will pay a commitment fee on any undrawn and uncanceled amounts in the bridge
credit facility which varies according to the credit rating assigned to Alcan at
the relevant time, and ranges from 0.06% per annum to 0.25% per annum. Interest
on committed LIBOR-based borrowings shall accrue at the applicable margin plus
LIBOR.



Interest on borrowing described in the bridge credit facility as U.S. dollars
base rate borrowings shall accrue at the higher of RBC Capital Markets' prime
rate for U.S. dollar loans in the U.S. and 0.5% per annum above the Federal
Funds Rate, plus a margin 1.0% lower (but not less than zero) than the margin
for LIBOR-based borrowings.



Terms and conditions usual for facilities of this type apply to the bridge
credit facility, including prepayment provisions (for example, in the event of
certain asset disposals, securities issuances, the change in control of Alcan,
cross-default and bankruptcy), representations and warranties (such as in
relation to corporate existence, authorizations and financial statements),
covenants (such as information undertakings and negative pledge), indemnities
and provisions to protect the margin receivable by the lenders. The bridge
credit facility does not grant the lending banks a security interest.


                              TERMS OF THE OFFERS

Alcan is offering to acquire all of Pechiney's share capital and equity
securities, including:

     - all issued and outstanding Pechiney Common Shares, and all Pechiney
       Common Shares held as treasury stock;

     - all of the outstanding Pechiney OCEANEs;

     - all of the Pechiney Common Shares that are issuable prior to the
       expiration of the offers upon the conversion of Pechiney OCEANEs;

     - all of the outstanding Pechiney Bonus Allocation Rights;

     - all of the outstanding Pechiney ADSs; and

     - all Pechiney Common Shares issuable upon the exercise of Pechiney Common
       Shares subscription options that are or may become exercisable prior to
       the expiration of the offers.

Holders of Pechiney stock purchase options or Pechiney stock subscription
options who wish to tender into this offer must exercise their options, and the
Pechiney Common Shares must be credited to their accounts, prior to the
expiration date of the offer in order to be able to participate.


Upon the terms and subject to the conditions set forth in this prospectus and
the related letter of transmittal and forms of acceptance, we are offering to
exchange:


     - 3 Alcan Common Shares and E123 in cash for every 5 Pechiney Common
       Shares;


     - 3 Alcan Common Shares and E123 in cash for every 50 Pechiney Bonus
       Allocation Rights (each Pechiney Bonus Allocation Right entitling the
       holder to 0.1 of a Pechiney Common Share);


     - E81.70 in cash for each Pechiney OCEANE; and

     - 3 Alcan Common Shares and E123 in cash for every 10 Pechiney ADSs (each
       Pechiney ADS representing one-half of one Pechiney Common Share)
       tendered.


(Pechiney Common Shares, Pechiney Bonus Allocation Rights and Pechiney ADSs that
are exchanged for the mix of Alcan Common Shares and cash described above are
referred to as "Mixed Consideration Shares").


                                        52


However, if you hold Pechiney Common Shares, Pechiney Bonus Allocation Rights or
Pechiney ADSs, then, in lieu of the mix of Alcan Common Shares and cash
described above, you may make the following elections with respect to the
consideration you wish to receive:


     - You may elect to receive 3 Alcan Common Shares for each 2 Pechiney Common
       Shares, each 20 Pechiney Bonus Allocation Rights or each 4 Pechiney ADSs
       that you tender (this is referred to as the "Stock Consideration" and all
       Pechiney Common Shares for which this election is made, including, for
       this purpose, all Pechiney Common Shares underlying Pechiney Bonus
       Allocation Rights and Pechiney ADSs, are referred to as "Stock Election
       Shares"); or



     - You may elect to receive E41 in cash for each Pechiney Common Share or
       each 2 Pechiney ADSs that you tender or E4.1 in cash for each Pechiney
       Bonus Allocation Right that you tender (this is referred to as the "Cash
       Consideration" and all Pechiney Common Shares for which this election is
       made, including, for this purpose, all Pechiney Common Shares underlying
       Pechiney Bonus Allocation Rights and Pechiney ADSs, are referred to as
       "Cash Election Shares").



You are not required to make the same election for all of the Pechiney Common
Shares, Pechiney Bonus Allocation Rights or Pechiney ADSs that you tender, and
you may make any of these elections for all or some of the Pechiney Common
Shares, Pechiney Bonus Allocation Rights or Pechiney ADSs that you tender.
However, these election options are subject to a proration and allocation
procedure, described below, that will ensure that, in the aggregate, 40% of the
Pechiney Common Shares (including, for the purposes of this calculation, the
Pechiney Common Shares underlying the tendered Pechiney Bonus Allocation Rights
and Pechiney ADSs) tendered in this offer and the French offer are exchanged for
Alcan Common Shares and 60% are exchanged for cash (excluding the effect of the
treatment of fractional shares that would otherwise be issued). Thus, with
respect to Stock Election Shares and Cash Election Shares, the amount of Alcan
Common Shares or cash that you actually receive will depend upon the elections
of other holders of Pechiney Common Shares, Pechiney Bonus Allocation Rights and
Pechiney ADSs. All the Mixed Consideration Shares will be exchanged for the mix
of Alcan Common Shares and cash described above.



Tendered Pechiney securities for which no election is made will be treated as
Mixed Consideration Shares.


Proration and Allocation Procedures

If the total number of Cash Election Shares is not equal to 1.5 (60% divided by
40%, referred to as the "Ratio") times the total number of Stock Election
Shares, then the following proration and allocation adjustment will be applied
to the Cash Election Shares or the Stock Election Shares, as the case may be:

     - In the event that the total number of Cash Election Shares divided by the
       total number of Stock Election Shares exceeds the Ratio, then each Stock
       Election Share will receive the Stock Consideration, while the number of
       Cash Election Shares will be reduced to the number required to achieve
       the Ratio. This reduction will be effected proportionately among the
       holders of Cash Election Shares. The adjusted number of Cash Election
       Shares will be rounded down to the nearest whole Cash Election Share. All
       tendered Pechiney securities deemed not to be Cash Election Shares as a
       result of the operation of this proration and allocation procedure will
       be deemed to be Mixed Consideration Shares.

     - In the event that the total number of Cash Election Shares divided by the
       total number of Stock Election Shares is less than the Ratio, then each
       Cash Election Share will receive the Cash Consideration, while the number
       of Stock Election Shares will be reduced to the number required to
       achieve the Ratio. This reduction will be effected proportionately among
       the holders of Stock Election Shares. The adjusted number of Stock
       Election Shares will be rounded down to the nearest whole Stock Election
       Share. All tendered Pechiney securities deemed not to be Stock Election
       Shares as a result of the operation of this proration and allocation
       procedure will be deemed to be Mixed Consideration Shares.

                                        53



The following examples illustrate the number of Alcan Common Shares and cash
that Pechiney securityholders would receive under certain election scenarios.



Example 1.  The Pechiney securityholders who make elections in the aggregate
tender 50% of the tendered Pechiney Securities for which these elections are
made as Cash Election Shares and 50% as Stock Election Shares.



The tables below assume that, in the aggregate, 50% of the Pechiney securities
tendered in the offers for which elections are made are tendered as Cash
Election Shares and 50% are tendered as Stock Election Shares. In this case, all
of the Cash Election Shares will be exchanged for the Cash Consideration (since
the number of Cash Election Shares divided by the number of Stock Election
Shares is less than the Ratio), but, in order to ensure that 60% of the Pechiney
Common Shares (including those underlying the Pechiney Bonus Allocation Rights
and Pechiney ADSs) tendered are exchanged for cash and 40% are exchanged for
Alcan Common Shares, the total number of Stock Election Shares will be reduced
by one third (1-50%/(Ratio X 50%)). Thus, an individual Pechiney securityholder
tendering Cash Election Shares and Stock Election Shares into the offers will
have all of its Cash Election Shares exchanged for the Cash Consideration but
will have the number of Stock Election Shares reduced by one third, regardless
of the relative number of Stock Election Shares and Cash Election Shares that it
tenders.



In these examples, the "Service Rate" means the percentage of Cash Election
Shares or Stock Election Shares that receive the Cash Consideration or the Stock
Consideration, respectively, after the application of the proration and
allocation procedures.





 TENDER BY A HOLDER    NUMBER OF PECHINEY
   OF 200 PECHINEY       COMMON SHARES        PRORATION     TENDER ALLOCATION
    COMMON SHARES           TENDERED         ADJUSTMENT     AFTER ADJUSTMENT       CONSIDERATION
---------------------  ------------------  ---------------  -----------------  ----------------------
                                                                   
Stock Election
  Shares.............  100 Pechiney        1/3 Adjustment   Stock Election     = 66 X 1.5 = 99 Alcan
                       Common Shares       2/3 Service      Shares: 66         Common Shares
                                           Rate             Pechiney Common
                                                            Shares
                                                            Mixed              = (i) 34 X 0.6 = 20.4
                                                            Consideration      Alcan Common Shares,
                                                            Shares: 34         rounded to 20 Alcan
                                                            Pechiney Common    Common Shares and
                                                            Shares             E10.94 in cash for the
                                                                               fractional share (0.4
                                                                               X E27.35)(1) and (ii)
                                                                               cash of 34 X E24.60(2)
                                                                               = E836.40
Cash Election
  Shares.............  100 Pechiney        No reduction:    Cash Election      = 100 X E41 = E4,100
                       Common Shares       Service Rate of  Shares: 100
                                           100%             Pechiney Common
                                                            Shares
TOTAL = 119 ALCAN COMMON SHARES AND E4,947.34 IN CASH



---------------


(1) This is hypothetical, assuming that the aggregated fractional shares are
    sold on the market at Alcan's closing per share price on July 3, 2003,
    E27.35.



(2) E123/5



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 100 shares as Cash Election Shares and
100 shares as Stock Election Shares, the 100 Pechiney Common Shares tendered as
Cash Election Shares will be entirely exchanged for the Cash Consideration (100
X E41 = E4,100). However, a proration adjustment must be applied to the Stock
Election Shares in order to maintain the Ratio of 1.5. In this example, the 100
Pechiney Common Shares tendered as Stock


                                        54



Election Shares are reduced by one-third, resulting in the number of Pechiney
Common Shares deemed tendered as Stock Election Shares being 66 shares (100 X
2/3 = 66.66 Pechiney Common Shares, rounded down to 66). The 34 remaining
Pechiney Common Shares are deemed to be tendered as Mixed Consideration Shares.



The 66 Stock Election Shares entitle the securityholder to receive 99 Alcan
Common Shares (66 X 3/2 = 99). The 34 Pechiney Common Shares deemed to be Mixed
Consideration Shares entitle the securityholder to receive 20.4 Alcan Common
Shares (34 X 3/5) and E836.40 (34 X E24.60) in cash. In lieu of the issuance of
fractional shares (0.4 of an Alcan Common Share in this example), the fractional
Alcan Common Shares will be aggregated and sold on the market, and the Pechiney
securityholder will receive an amount in cash (in euros, rounded to the nearest
euro cent, with E0.005 being rounded down) equal to the relevant fraction of a
share multiplied by the average sale price on the market of the aggregated
fractional Alcan Common Shares that would otherwise have been issued as
consideration (see "-- Fractional Shares" below). For the sole purpose of the
example above, it is assumed that the average sale price on the market of the
fractional shares is the closing price per Alcan Common Share on July 3, 2002,
being E27.35. As a result, the Pechiney securityholder will receive E10.94 for
the fractional Alcan Common Share (0.40 X E27.35).





TENDER BY A HOLDER OF  NUMBER OF PECHINEY
 200 PECHINEY COMMON     COMMON SHARES         PRORATION         TENDER ALLOCATION
       SHARES               TENDERED           ADJUSTMENT         AFTER REDUCTION             CONSIDERATION
---------------------  ------------------   ----------------   ----------------------   -------------------------
                                                                            
Stock Election
  Shares.............  80 Pechiney Common   1/3 Adjustment     Stock Election Shares:   = 53 X 1.5 = 79.5 Alcan
                       Shares               2/3 Service Rate   53 Pechiney Common       Common Shares, rounded to
                                                               Shares                   (i) 79 Alcan Common
                                                                                        Shares and (ii) 0.5 X
                                                                                        E27.35(1) = E13.67 in
                                                                                        cash for the fractional
                                                                                        share
                                                               Mixed Consideration      = (i) 27 X 0.6 = 16.2
                                                               Shares: 27 Pechiney      Alcan Common Shares,
                                                               Common Shares            rounded to (a) 16 Alcan
                                                                                        Common Shares and (b)
                                                                                        E5.47 in cash for the
                                                                                        fractional share (0.2 X
                                                                                        E27.35)(1) and (ii) cash
                                                                                        of 27 X E24.60(2) =
                                                                                        E664.20
Cash Election
  Shares.............  120 Pechiney         No adjustment:     Cash Election Shares:    = 120 X E41 = E4,920
                       Common Shares        Service Rate of    120 Pechiney Common
                                            100%               Shares




TOTAL = 95 ALCAN COMMON SHARES AND E5,603.34 IN CASH

---------------


(1) This is hypothetical, assuming that the aggregated fractional shares are
    sold on the market at Alcan's closing per share price on July 3, 2003,
    E27.35.



(2) E123/5



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 120 shares as Cash Election Shares and
80 shares as Stock Election Shares, the 120 Cash Election Shares will be
entirely exchanged for the Cash Consideration (120 X E41 = E4,920). However, the
proration adjustment will be applied to the 80 Stock Election Shares in order to
maintain the Ratio of 1.5. In this example, the 80 Pechiney Common Shares
tendered as Stock Election Shares are reduced by one-third, resulting in the
number of Pechiney Common Shares deemed tendered as Stock Election Shares being
53 shares (98 X 2/3 = 53.33 Pechiney Common Shares, rounded down to 53). The 27
remaining Pechiney Common Shares are deemed to be tendered as Mixed
Consideration Shares.


                                        55



The 53 Stock Election Shares entitle the securityholder to receive 79.5 Alcan
Common Shares (53 X 3/2 = 79.5). The 27 Pechiney Common Shares deemed to be
Mixed Consideration Shares entitle the securityholder to receive 16.2 Alcan
Common Shares (27 X 3/5) and E664.20 (27 X E24.60) in cash. In lieu of
fractional shares (0.7 of an Alcan Common Share in this example), the fractional
Alcan Common Shares will be aggregated and sold on the market, and the Pechiney
securityholder will receive an amount in cash (in euros, rounded to the nearest
euro cent, with E0.005 being rounded down) equal to the relevant fraction of a
share multiplied by the average sale price on the market of the aggregated
fractional Alcan Common Shares that would otherwise have been issued as
consideration (see "-- Fractional Shares" below). For the sole purpose of this
example, it is assumed that the average sale price on the market of the
fractional shares is the closing Alcan per share price on July 3, 2002, being
E27.35. As a result, the Pechiney securityholder will receive E19.14 for the
fractional Alcan Common Share ((0.5 + 0.2) X E27.35).





 TENDER BY A HOLDER    NUMBER OF PECHINEY
   OF 200 PECHINEY        COMMON SHARES         PRORATION       TENDER ALLOCATION
    COMMON SHARES           TENDERED            ADJUSTMENT       AFTER REDUCTION          CONSIDERATION
 ------------------    -------------------   ----------------   -----------------   --------------------------
                                                                        
Stock Election
  Shares.............  50 Pechiney Common    1/3 Adjustment     Stock Election      = 33 X 1.5 = 49.5 Alcan
                       Shares                2/3 Service Rate   Shares: 33          Common Shares, rounded to
                                                                Pechiney Common     (i) 49 Alcan Common Shares
                                                                Shares              and (ii) 0.5 X E27.35(1) =
                                                                                    E13.67 in cash for the
                                                                                    fractional share

                                                                Mixed               = (i) 17 X 0.6 = 10.2
                                                                Consideration       Alcan Common Shares,
                                                                Shares: 17          rounded to (a) 10 Alcan
                                                                Pechiney Common     Common Shares and (b)
                                                                Shares              E5.47 in cash for the
                                                                                    fractional share (0.2 X
                                                                                    E27.35)(1) and (ii) cash
                                                                                    of 17 X E24.60(2) =
                                                                                    E418.20

Cash Election
  Shares.............  150 Pechiney Common   No adjustment:     Cash Election       = 150 X E41 = E6,150
                       Shares                Service Rate of    Shares: 150
                                             100%               Pechiney Common
                                                                Shares




TOTAL = 59 ALCAN COMMON SHARES AND E6,587.34 IN CASH

---------------


(1) This is hypothetical, assuming that the aggregated fractional shares are
    sold on the market at Alcan's closing per share price on July 3, 2003,
    E27.35.



(2) E123/5



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 150 shares as Cash Election Shares and
50 shares as Stock Election Shares, the 150 Cash Election Shares will be
entirely exchanged for the Cash Consideration (150 X E41 = E6,150). However, the
proration adjustment will be applied to the 50 Stock Election Shares in order to
maintain the Ratio of 1.5. In this example, the 50 Pechiney Common Shares
tendered as Stock Election Shares are reduced by one-third, resulting in the
number of Pechiney Common Shares deemed tendered as Stock Election Shares being
33 shares (50 X 2/3 = 33.33 Pechiney Common Shares, rounded down to 33). The 17
remaining Pechiney Common Shares are deemed to be tendered as Mixed
Consideration Shares.



The 33 Stock Election Shares entitle the securityholder to receive 49.5 Alcan
Common Shares (33 X 3/2 = 49.5). The 17 Pechiney Common Shares deemed to be
Mixed Consideration Shares entitle the securityholder to receive 10.2 Alcan
Common Shares (17 X 3/5) and E418.20 (17 X E24.60) in cash. In lieu of
fractional shares (0.7 of an Alcan Common Share in this example), the fractional
Alcan Common Shares will be


                                        56



aggregated and sold on the market, and the Pechiney securityholder will receive
an amount in cash (in euros, rounded to the nearest euro cent, with E0.005 being
rounded down) equal to the relevant fraction of a share multiplied by the
average sale price on the market of the aggregated fractional Alcan Common
Shares that would otherwise have been issued as consideration (see
"-- Fractional Shares" below). For the sole purpose of this example, it is
assumed that the average sale price on the market of the fractional shares is
the closing Alcan per share price on July 3, 2002, being E27.35. As a result,
the Pechiney securityholder will receive E19.14 for the fractional Alcan Common
Share ((0.5 + 0.2) X E27.35).



Example 2.  The Pechiney securityholders who make elections in the aggregate
tender 60% of the tendered Pechiney Securities for which these elections are
made as Cash Election Shares and 40% as Stock Election Shares.



The tables below assume that, in the aggregate, 60% of the Pechiney securities
tendered in the offers for which elections are made are tendered as Cash
Election Shares and 40% are tendered as Stock Election Shares. In this case,
since the aggregate elections are equal to the Ratio, there will be no proration
adjustment and the Pechiney securityholders will receive the Cash Consideration
or the Share Consideration in accordance with their elections. Thus, an
individual Pechiney securityholder tendering Cash Election Shares and Stock
Election Shares into the offers will have all of its Cash Election Shares
exchanged for the Cash Consideration and will have all of its Stock Election
Shares exchanged for the Stock Consideration, regardless of the relative number
of Stock Election Shares and Cash Election Shares that it tenders.





TENDER BY A HOLDER     NUMBER OF PECHINEY
OF 200 PECHINEY          COMMON SHARES        PRORATION     TENDER ALLOCATION
COMMON SHARES               TENDERED         ADJUSTMENT      AFTER REDUCTION     CONSIDERATION
------------------     ------------------  ---------------  -----------------   ---------------
                                                                    
Stock Election
  Shares.............  100 Pechiney        No adjustment:   Stock Election      = 100 X 1.5
                       Common Shares       Service Rate of  Shares: 100         = 150 Alcan
                                           100%             Pechiney Common     Common Shares
                                                            Shares
Cash Election
  Shares.............  100 Pechiney        No adjustment:   Cash Election       = 100 X E41
                       Common Shares       Service Rate of  Shares: 100         = E4,100
                                           100%             Pechiney Common
                                                            Shares




TOTAL = 150 ALCAN COMMON SHARES AND E 4,100 IN CASH



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 100 shares as Cash Election Shares and
100 shares as Stock Election Shares, the 100 Cash Election Shares will be
entirely exchanged for the Cash Consideration (100 X E41 = E4,100) and the 100
Stock Election Shares will be entirely exchanged for the Stock Consideration
(100 X 1.5 = 150 Alcan Common Shares), with no proration adjustment.





TENDER BY A HOLDER OF  NUMBER OF PECHINEY
    200 PECHINEY         COMMON SHARES                           TENDER ALLOCATION
    COMMON SHARES           TENDERED       PRORATION ADJUSTMENT   AFTER REDUCTION       CONSIDERATION
---------------------  ------------------  --------------------  -----------------  ----------------------
                                                                        
Stock Election
Shares...............  80 Pechiney Common  No adjustment:        Stock Election     = 80 x 1.5 = 120 Alcan
                       Shares              Service Rate of 100%  Shares: 80         Common Shares
                                                                 Pechiney Common
                                                                 Shares
Cash Election
Shares...............  120 Pechiney        No adjustment:        Cash Election      = 120 x E41 = E4,920
                       Common Shares       Service Rate of 100%  Shares: 120
                                                                 Pechiney Common
                                                                 Shares




Total = 120 Alcan Common Shares and E4,920 in cash


                                        57



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 120 shares as Cash Election Shares and
80 shares as Stock Election Shares, the 120 Cash Election Shares will be
entirely exchanged for the Cash Consideration (120 x E41 = E4,920) and the 80
Stock Election Shares will be entirely exchanged for the Stock Consideration (80
x 1.5 = 120 Alcan Common Shares), with no proration adjustment.





TENDER BY A HOLDER     NUMBER OF PECHINEY
OF 200 PECHINEY          COMMON SHARES                           TENDER ALLOCATION
COMMON SHARES               TENDERED       PRORATION ADJUSTMENT   AFTER REDUCTION       CONSIDERATION
------------------     ------------------  --------------------  -----------------  ----------------------
                                                                        
Stock Election         50 Pechiney Common  No adjustment:        Stock Election     = 50 x 1.5 = 75 Alcan
  Shares.............  Shares              Service Rate of 100%  Shares: 50         Common Shares
                                                                 Pechiney Common
                                                                 Shares
Cash Election          150 Pechiney        No adjustment:        Cash Election      = 150 x E41 = E6,150
  Shares.............  Common Shares       Service Rate of 100%  Shares: 150
                                                                 Pechiney Common
                                                                 Shares




Total = 75 Alcan Common Shares and E6,150 in cash



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 150 shares as Cash Election Shares and
50 shares as Stock Election Shares, the 150 Cash Election Shares will be
entirely exchanged for the Cash Consideration (150 x E41 = E6,150) and the 50
Stock Election Shares will be entirely exchanged for the Stock Consideration (50
x 1.5 = 75 Alcan Common Shares), with no proration adjustment.



Example 3.  The Pechiney securityholders who make elections in the aggregate
tender 75% of the tendered Pechiney Securities for which these elections are
made as Cash Election Shares and 25% as Stock Election Shares.



The tables below assume that, in the aggregate, 75% of the Pechiney securities
tendered in the offers for which elections are made are tendered as Cash
Election Shares and 25% are tendered as Stock Election Shares. In this case, all
of the Stock Election Shares will be exchanged for the Stock Consideration
(since the number of Cash Election Shares divided by the number of Stock
Election Shares is greater than the Ratio), but, in order to ensure that 60% of
the Pechiney Common Shares (including those underlying the Pechiney Bonus
Allocation Rights and Pechiney ADSs) tendered are exchanged for cash and 40% are
exchanged for Alcan Common Shares, the total number of Cash Election Shares will
be reduced by half (1 - (Ratio X 25%)/ 75%). Thus, an individual Pechiney
securityholder tendering Cash Election Shares and Stock Election Shares into the
offers will have all of its Stock Election Shares exchanged for the Stock
Consideration but will have the number of Cash Election Shares reduced by half,
regardless of the relative number of Stock Election Shares and Cash Election
Shares that it tenders.



In these examples, the "Service Rate" means the percentage of Cash Election
Shares or Stock Election Shares that receive the Cash Consideration or the Stock
Consideration, respectively, after the application of the proration and
allocation procedures.


                                        58





TENDER BY A HOLDER OF  NUMBER OF PECHINEY
 200 PECHINEY COMMON      COMMON SHARES                              TENDER ALLOCATION
       SHARES               TENDERED         PRORATION ADJUSTMENT    AFTER ADJUSTMENT        CONSIDERATION
---------------------  -------------------   --------------------   -------------------   -------------------
                                                                              
Stock Election
  Shares.............  100 Pechiney Common   No reduction:          Stock Election        = 100 X 1.5 = 150
                       Shares                Service Rate of 100%   Shares: 100           Alcan Common Shares
                                                                    Pechiney Common
                                                                    Shares
Cash Election
  Shares.............  100 Pechiney Common   50% Adjustment         Cash Election         = 50 X E41 = E2,050
                       Shares                50% Service Rate       Shares: 50 Pechiney
                                                                    Common Shares
                                                                    Mixed Consideration   = (i) 50 X 0.6 = 30
                                                                    Shares: 50 Pechiney   Alcan Common Shares
                                                                    Common Shares         and (ii) cash of 50
                                                                                          X E24.60(1)
                                                                                          = E1,230




TOTAL = 180 ALCAN COMMON SHARES AND E3,280 IN CASH

---------------


(1) E123/5



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 100 shares as Cash Election Shares and
100 shares as Stock Election Shares, the 100 Pechiney Common Shares tendered as
Stock Election Shares will be entirely exchanged for the Stock Consideration
(100 X 1.5 = 150 Alcan Common Shares). However, a proration adjustment must be
applied to the Cash Election Shares in order to maintain the Ratio of 1.5. In
this example, the 100 Pechiney Common Shares tendered as Cash Election Shares
are reduced by one-half, resulting in the number of Pechiney Common Shares
deemed tendered as Cash Election Shares being 50 shares (100 X 1/2 = 50 Pechiney
Common Shares. The 50 remaining Pechiney Common Shares are deemed to be tendered
as Mixed Consideration Shares.



The 50 Mixed Consideration Shares entitle the securityholder to receive 30 Alcan
Common Shares (50 X 3/5 = 30) and E1,230 (50 X E24.60) in cash.





TENDER BY A HOLDER OF  NUMBER OF PECHINEY
 200 PECHINEY COMMON      COMMON SHARES                              TENDER ALLOCATION
       SHARES               TENDERED         PRORATION ADJUSTMENT    AFTER ADJUSTMENT        CONSIDERATION
---------------------  -------------------   --------------------   -------------------   -------------------
                                                                              
Stock Election
  Shares.............  80 Pechiney Common    No reduction:          Stock Election        = 80 X 1.5 = 120
                       Shares                Service Rate of 100%   Shares: 80 Pechiney   Alcan Common Shares
                                                                    Common Shares
Cash Election
  Shares.............  120 Pechiney Common   50% Adjustment 50%     Cash Election         = 60 X E41 = E2,460
                       Shares                Service Rate           Shares: 60 Pechiney
                                                                    Common Shares
                                                                    Mixed Consideration   = (i) 60 X 0.6 = 36
                                                                    Shares: 60 Pechiney   Alcan Common Shares
                                                                    Common Shares         and (ii) cash of 60
                                                                                          X E24.60(1) =
                                                                                          E1,476




TOTAL = 156 ALCAN COMMON SHARES AND E3,936 IN CASH

---------------


(1) E123/5



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 120 shares as Cash Election Shares and
80 shares as Stock Election Shares, the 80 Pechiney Common Shares tendered as
Stock Election Shares will be entirely exchanged for the Stock Consideration (80
X 1.5 =


                                        59



120 Alcan Common Shares). However, a proration adjustment must be applied to the
Cash Election Shares in order to maintain the Ratio of 1.5. In this example, the
120 Pechiney Common Shares tendered as Cash Election Shares are reduced by
one-half, resulting in the number of Pechiney Common Shares deemed tendered as
Cash Election Shares being 60 shares (120 X 1/2 = 60 Pechiney Common Shares. The
60 remaining Pechiney Common Shares are deemed to be tendered as Mixed
Consideration Shares.



The 60 Mixed Consideration Shares entitle the securityholder to receive 36 Alcan
Common Shares (60 X 3/5 = 36) and E1,476 (60 X E24.60).





TENDER BY A HOLDER OF  NUMBER OF PECHINEY
 200 PECHINEY COMMON      COMMON SHARES                              TENDER ALLOCATION
       SHARES               TENDERED         PRORATION ADJUSTMENT    AFTER ADJUSTMENT        CONSIDERATION
---------------------  -------------------   --------------------   -------------------   -------------------
                                                                              
Stock Election
  Shares.............  50 Pechiney Common    No reduction:          Stock Election        = 50 X 1.5 = 75
                       Shares                Service Rate of 100%   Shares: 50 Pechiney   Alcan Common Shares
                                                                    Common Shares
Cash Election
  Shares.............  150 Pechiney Common   50% Adjustment         Cash Election         = 75 X E41
                       Shares                50% Service Rate       Shares: 75 Pechiney   = E3,075
                                                                    Common Shares
                                                                    Mixed Consideration   = (i) 75 X 0.6 = 45
                                                                    Shares: 75 Pechiney   Alcan Common Shares
                                                                    Common Shares         and (ii) cash of 75
                                                                                          X E24.60(1)
                                                                                          = E1,845




TOTAL = 120 ALCAN COMMON SHARES AND E4,920 IN CASH

---------------


(1) E123/5



As illustrated in the table above, if a Pechiney securityholder holding 200
Pechiney Common Shares wishes to tender 150 shares as Cash Election Shares and
50 shares as Stock Election Shares, the 50 Pechiney Common Shares tendered as
Stock Election Shares will be entirely exchanged for the Stock Consideration (50
X 1.5 = 75 Alcan Common Shares). However, a proration adjustment must be applied
to the Cash Election Shares in order to maintain the Ratio of 1.5. In this
example, the 150 Pechiney Common Shares tendered as Cash Election Shares are
reduced by one-half, resulting in the number of Pechiney Common Shares deemed
tendered as Cash Election Shares being 75 shares (150 X 1/2 = 75 Pechiney Common
Shares. The 75 remaining Pechiney Common Shares are deemed to be tendered as
Mixed Consideration Shares.



The 75 Mixed Consideration Shares entitle the securityholder to receive 45 Alcan
Common Shares (75 X 3/5 = 45) and E1,845 (75 X E24.60) in cash.



If there is a subsequent offering period, the same proration and allocation
procedures described above will be applied to the Pechiney Common Shares,
Pechiney Bonus Allocation Rights and Pechiney ADSs tendered into the subsequent
offering period. See "-- Expiration Date; Publication of Results; Subsequent
Offering Period" below.



For legal and regulatory reasons, Alcan is offering to acquire all of the
Pechiney securities through two separate offers:



     - a U.S. offer open to all holders of Pechiney securities (other than
       Pechiney ADSs) who are located in the United States and to all holders of
       Pechiney ADSs, wherever located, and



     - a French offer open to all holders of Pechiney securities (other than
       Pechiney ADSs) who are located in France and to holders of Pechiney
       securities (other than Pechiney ADSs) who are located outside of France
       and the United States if, pursuant to the local laws and regulations
       applicable to such holders, they are permitted to participate in the
       French offer.


                                        60


The U.S. and French offers for Pechiney securities are being made at the same
time and on the same terms and completion of the offers are subject to the same
conditions. This prospectus covers only Alcan's U.S. offer for Pechiney
securities.


The U.S. offer will begin on       , 2003 and end at       , New York City time
(or       Central European time), on       , 2003, unless it is extended or it
lapses or is withdrawn prior to that time on the basis of the conditions of the
offers as described in this prospectus. The CMF may decide to extend the offer
period under certain circumstances, including in the event of the initiation of
a competing offer, in which case the U.S. offer period will be likewise
extended. You must tender your Pechiney securities before the expiration of the
U.S. offer to participate.



If all of the Pechiney securities are tendered and exchanged pursuant to the
terms of the offers, the current holders of Pechiney securities will own
approximately 14.8% of Alcan's outstanding Common Shares, on a fully diluted
basis, immediately after the exchange and the current Alcan shareholders will
own approximately 87.3% of Alcan's outstanding Common Shares, on a fully diluted
basis, immediately after the exchange.


                              CONDITIONS PRECEDENT

The offers are subject to the following conditions precedent:


     - Valid acceptances, that have not been withdrawn at the end of the
       offering period, in respect of Pechiney securities representing a
       majority of the total share capital and voting rights in Pechiney,
       calculated on a fully diluted basis on the closing date of the offers,
       are tendered in this offer and the French offer, on a combined basis. For
       the purpose of calculating whether this threshold has been met, the
       numerator will include all the Pechiney securities tendered in this offer
       and the French offer, on a combined basis, including all (i) Pechiney
       Common Shares tendered and Pechiney ADSs tendered (each Pechiney ADS
       representing one-half of one Pechiney Common Share), (ii) Pechiney Common
       Shares underlying all tendered Pechiney OCEANEs (taking into account the
       number of Pechiney Common Shares into which the tendered Pechiney OCEANEs
       could be converted on the expiration date of the offers), and (iii)
       Pechiney Common Shares underlying all tendered Pechiney Bonus Allocation
       Rights (each Pechiney Bonus Allocation Right entitling the holder to 0.1
       of a Pechiney Common Share). The denominator for this calculation will be
       comprised of Pechiney's fully diluted share capital, including all:


       - issued and outstanding Pechiney Common Shares and treasury stock held
         by Pechiney;

       - Pechiney ADSs (each Pechiney ADS representing one-half of one Pechiney
         Common Share); and

       - Pechiney Common Shares underlying Pechiney OCEANEs, Pechiney Bonus
         Allocation Rights, and all outstanding Pechiney subscription stock
         options (whether or not exercisable during the offer period).


       Under French law and regulations, a waiver of the minimum tender
       condition is deemed an improved offer and Alcan may only file an improved
       offer with the CMF on or prior to the date that is five French trading
       days prior to the expiration of the offer period. If this minimum tender
       condition is not met, the offers will lapse. Neither Alcan nor Pechiney
       securityholders will know whether the minimum tender condition has been
       met until the results of the offers are published by the CMF following
       the expiration of the tender offer period.



     - The offers are also conditional upon receipt of competition approval from
       the European Commission and, to the extent that jurisdiction to review
       all or a part of the transaction is referred by the European Commission
       to any Relevant National Authorities, receipt of approval from those
       Relevant National Authorities, as well as termination or expiration of
       the waiting period under the Hart-Scott-Rodino Antitrust Improvements Act
       of 1976, as amended. If the European Commission or any Relevant National
       Authority with jurisdiction to review all or part of the transaction
       determines that the transaction requires investigation that extends
       beyond the relevant initial period of investigation (i.e., enter into a
       "Phase II review") or the U.S. Department of Justice or the Federal Trade
       Commission

                                        61



       issues a second request for information, the offers will lapse. The
       satisfaction of this competition and antitrust condition will be
       determined on or prior to the expiration date of the offers. Furthermore,
       the offers cannot close until the transaction has been approved by the
       European Commission and the Relevant National Authorities, if any, and
       until the waiting period under the Hart-Scott-Rodino Antitrust
       Improvements Act of 1976, as amended, has been terminated or expired
       without any action being commenced in any U.S. court seeking to prohibit
       the offers.



If the offers lapse because any of the conditions precedent are not met, Alcan
reserves the right to commence a new offer, or not to commence a new offer, in
its discretion. If the offers lapse, the Pechiney securities that you tendered
in this offer will be returned to you without interest or any other payment
being due. This should occur within one or two French trading days following the
announcement of the withdrawal or lapse.


                       GROUNDS FOR WITHDRAWING THE OFFERS

In accordance with French law and regulation, Alcan reserves the right to
withdraw the offers:


     - within five French trading days following the date of the publication by
       the CMF of the offer calendar for a competing offer for Pechiney or an
       improved bid by a competing bidder; or



     - with the prior approval of the CMF if, during the exercise period of
       these offers, Pechiney adopts definitive measures that modify Pechiney's
       substance ("modifiant sa consistance") or if the offers become irrelevant
       ("sans objet") under French law (the terms "modifiant sa consistance" and
       "sans objet" are subject to interpretation by the CMF).


In addition, as mentioned above, if the conditions precedent of the offers,
including the tender threshold and the clearance from competition and antitrust
authorities in Europe and the United States, are not satisfied, the offers will
lapse.


Under French law, if, during the period of these offers, another offer for
Pechiney, or an improved bid by a competing bidder, is approved by the CMF, your
tenders of Pechiney securities may be declared null and void by the CMF. In this
event, in order to tender your Pechiney securities in this offer, if it remains
outstanding, you will be required to re-tender your Pechiney securities.



If the offers are withdrawn or lapse, the Pechiney securities that you tendered
in this offer will be returned to you without interest or any other payment
being due. This should occur within one or two French trading days following the
announcement of the withdrawal or lapse.



      EXPIRATION DATE; PUBLICATION OF RESULTS; SUBSEQUENT OFFERING PERIOD


The tender period for this offer has been established by the CMF, which solely
determines whether or not to extend the offer period. Alcan may not itself
extend the offer period.


The offers will expire at           , New York City time (or           , Central
European time) on           , 2003, unless the offer period is extended, or
unless the offers lapse or are withdrawn prior to that time. We expect the
definitive results of the offers to be published by the CMF approximately six to
nine French trading days following the expiration date of the offer period;
however, the CMF will publish provisional results prior to its publication of
the definitive results. The CMF's publication of the definitive results of the
offers will disclose the total number of each type of Pechiney security
tendered, as well as the percentage of total capital and voting rights
represented by those tendered securities. This publication will also disclose
the breakdown of elections made by tendering security holders, and, in the event
that the proration and allocation procedures are applied, the percentage of
securities in a particular election that was subject to the proration
adjustment. The CMF may decide to extend the initial offer period under certain
circumstances, including in the event of the initiation of a competing offer, in
which case this U.S. offer period will be likewise extended. In addition, the
CMF may permit Alcan to open a subsequent offer period under certain
circumstances related to, among other things, the success of the offers, as
described further in the next paragraph. Any such subsequent offer period would
be likewise open to U.S. holders of Pechiney securities.


                                        62



If, through this offer and the French offer, on a combined basis, we acquire at
least two-thirds of Pechiney's total share capital and voting rights, or more
than 50% if there is a concurrent competing offer, we may elect to provide a
subsequent offering period of at least ten French trading days by issuing a
press release publicizing this decision within ten French trading days following
the publication of the definitive results of the offers. The CMF would then set
and publish the calendar for such a subsequent offering period, which would
ordinarily begin within a few days following the publication by the CMF of a
calendar for the subsequent offering period. We have not, however, yet made a
final decision as to whether we will provide a subsequent offering period if the
two-thirds (or 50%, as the case may be) tendered threshold is met. In the event
of a subsequent offering period, we will offer the same consideration being
offered during this initial offering period. Elections to receive all Alcan
Common Shares or all cash in any subsequent offering period will be subject to
the same proration and allocation procedures that apply to this initial offering
period, to ensure that 40% of the Pechiney Common Shares (including Pechiney
Common Shares underlying the Pechiney Bonus Allocation Rights and Pechiney ADSs)
tendered in the subsequent offering period are exchanged for Alcan Common Shares
and 60% are exchanged for cash. Due to the application of the proration and
allocation procedures to a separate pool of tendered Pechiney securities in the
subsequent offering period, holders of Pechiney securities making the same
elections in the initial offering period and any subsequent offering period may
not receive the same mix of Alcan Common Shares and cash.



The Company will accept any and all Pechiney securities tendered into a
subsequent offering and not validly withdrawn prior to the expiration of the
subsequent offering period. Delivery of Alcan Common Shares and cash to
tendering Pechiney securityholders will occur following the expiration of the
subsequent offering period. See "-- Delivery of Alcan Common Shares and Cash;
Settlement Date" below.



           SUBSEQUENT TRANSACTIONS; DELISTING; COMPULSORY ACQUISITION



Alcan has not determined whether and when it would seek to acquire any Pechiney
securities not tendered into the offers and expects to make those determinations
based on the circumstances existing at the appropriate time. Subject to
applicable law and regulation, Alcan could effect any such acquisitions by way
of market purchases, block trades, a subsequent offer or a repurchase offer. The
consideration offered in any such acquisition could differ from the
consideration offered in these offers.



If, as a result of these offers, there is no longer an active trading market for
the Pechiney Common Shares or the Pechiney OCEANEs and the liquidity of these
Pechiney securities is materially adversely affected, Alcan may petition
Euronext Paris to cause the delisting of the Pechiney Common Shares and/or
Pechiney OCEANEs. Any such petition for delisting would be subject to the
approval of the French Commission des operations de bourse, or COB. Furthermore,
subject to the completion of the offers, Alcan intends to cause Pechiney to
terminate its deposit agreement, and to petition, or cause Pechiney to petition,
the New York Stock Exchange to delist the Pechiney ADSs. If the deposit
agreement for the Pechiney ADSs is terminated, holders of Pechiney ADSs will
only have the right to receive the Pechiney Common Shares underlying the
Pechiney ADSs upon surrender of any receipt representing the Pechiney ADSs and
payment of applicable fees to the Pechiney ADS depositary. There is no U.S.
public trading market for the Pechiney Common Shares.



If Alcan acquires Pechiney securities representing at least 95% of the total
voting rights in Pechiney, Alcan may launch, subject to applicable law and
obtaining the requisite approvals, including the approval by the CMF, a
withdrawal offer or offers (offre publique de retrait), or buy-out, which, if
following the buy-out Alcan also holds at least 95% of the total share capital
in Pechiney, may be followed by a compulsory acquisition (retrait obligatoire),
or squeeze-out, of all remaining Pechiney securities not held by Alcan,
including all Pechiney Common Shares, Pechiney OCEANEs, Pechiney Bonus
Allocation Rights and Pechiney ADSs (including the Pechiney Common Shares
underlying the Pechiney ADSs). Under French regulations, the offeror is required
to state in its withdrawal offer whether the offer will be immediately followed
by a compulsory acquisition, or whether the offeror has only reserved the right
to proceed with a compulsory acquisition. If it reserves the right to proceed
with a compulsory acquisition, the offeror must decide within ten French trading
days following the close of the withdrawal offer whether it will proceed with
the compulsory acquisition. The CMF would establish the offer calendar for any
such withdrawal offer or compulsory


                                        63



acquisition. The consideration offered in any such withdrawal offer may be
different from the consideration offered in this offer, while the consideration
offered in any compulsory acquisition will be limited to cash. This cash
consideration, which would not be less than the value of the consideration in
the withdrawal offer, would be subject to the prior approval of the CMF in
France, which reviews its fairness on several bases, including a multi-criteria
analysis by an independent appraiser. Any such withdrawal offer and compulsory
acquisition may be made to U.S. holders of Pechiney securities in reliance on
certain exemptions from the U.S. tender offer rules.


           EFFECT OF THE OFFERS ON THE MARKET FOR PECHINEY SECURITIES

If the offers for Pechiney securities are successful, there may no longer be an
active trading market for the Pechiney securities, and their liquidity could be
materially adversely affected.


Pechiney ADSs are listed and traded on the New York Stock Exchange. Pechiney
Common Shares are listed and traded on Euronext Paris and on the London Stock
Exchange, and Pechiney OCEANEs are listed and traded on Euronext Paris.
Depending upon the number of Pechiney securities acquired pursuant to the
offers, following their completion the Pechiney ADSs may no longer meet the
listing requirements of the New York Stock Exchange, the Pechiney Common Shares
and the Pechiney OCEANEs may no longer meet the requirements of Euronext Paris
for continued listing and the Pechiney Common Shares may no longer meet the
requirements of the London Stock Exchange for continued listing. To the extent
permitted under applicable law and stock exchange regulations, Alcan may seek to
cause the termination of Pechiney's deposit agreement relating to the Pechiney
ADSs, and the delisting of the Pechiney ADSs, Pechiney Common Shares and
Pechiney OCEANEs on these exchanges. Any petition for delisting Pechiney
securities on Euronext Paris is subject to the prior approval of the COB, which
will consider whether the market for the Pechiney securities has been materially
adversely affected and whether delisting is in the best interests of the market.


If Alcan acquires sufficient Pechiney Common Shares in the offers to cause the
delisting of the Pechiney Common Shares, then, pursuant to the terms of the
Pechiney OCEANEs, the holders of the Pechiney OCEANEs may require Pechiney to
redeem the Pechiney OCEANEs for a make-whole payment.

Furthermore, pursuant to the terms of the Pechiney OCEANEs, if less than 10% of
the number of issued Pechiney OCEANEs remains outstanding following the
consummation of these offers, Alcan may cause Pechiney to redeem the Pechiney
OCEANEs at a redemption price determined pursuant to the terms of the Pechiney
OCEANEs. This redemption price would equal an amount that would provide the
holder of the Pechiney OCEANE with a return equal to the gross yield to maturity
that would have been realized by such holder at maturity. This redemption price
may be lower than the consideration offered to holders of the Pechiney OCEANEs
in these offers. For example, had this redemption option been available to, and
exercised by, Pechiney on July 7, 2003, the redemption price per Pechiney OCEANE
would have been E77.60.

If one or more of the New York Stock Exchange, Euronext Paris and SEAQ
International in London were to delist the Pechiney ADSs, Pechiney Common Shares
or Pechiney OCEANEs, the market therefor could be adversely affected. Although
it is possible that the Pechiney ADSs, Pechiney Common Shares and Pechiney
OCEANEs would be traded on other securities exchanges or in the over-the-counter
market, and the price quotations would be reported by such exchanges, or through
the National Association of Securities Dealers, Inc. Automated Quotations System
or by other sources, there can be no assurance that any such trading quotations
will occur. The extent of the public market for the Pechiney ADSs, Pechiney
Common Shares and Pechiney OCEANEs and the availability of such quotations would
depend upon the number of holders and/or the aggregate market value of the
Pechiney ADSs, Pechiney Common Shares and Pechiney OCEANEs, as the case may be,
remaining at such time, the interest in maintaining a market in such securities
on the part of securities firms and the possible termination of registration of
Pechiney ADSs under the Securities Exchange Act of 1934. If such registration is
terminated, Pechiney could cease filing periodic reports with the SEC, which
could further impact the value of the Pechiney securities. To the extent the
availability of such listings or quotations depends on steps taken by Alcan,
Alcan may or may not take such steps. Therefore, you should not rely on any such
listing or quotation being available following the successful completion of the
offers.
                                        64


                               FRACTIONAL SHARES


No fractional Alcan Common Shares will be issued in connection with the offers.
As a result, if you would like to receive the mixed consideration of Alcan
Common Shares and cash in exchange for your Pechiney securities, you must tender
5 Pechiney Common Shares, 50 Pechiney Bonus Allocation Rights or 10 Pechiney
ADSs, as the case may be, or multiples of those lots of Pechiney securities in
this offer. If you tender a fraction of those lots of Pechiney securities
(referred to as "remainder securities") you may elect, with respect to those
remainder securities, to tender them as Cash Election Shares or Stock Election
Shares.


If, without the application of the proration and allocation procedure described
above to reduce the total number of Stock Election Shares, the number of Stock
Election Shares tendered by each Pechiney securityholder is not a multiple of 2
(with respect to Pechiney Common Shares), 20 (with respect to Pechiney Bonus
Allocation Rights) or 4 (with respect to Pechiney ADSs), or if, as a result of
the proration and allocation procedure described above, the number of Mixed
Consideration Shares deemed tendered by the relevant Pechiney securityholder is
not a multiple of 5 (with respect to Pechiney Common Shares), 50 (with respect
to Pechiney Bonus Allocation Rights) or 10 (with respect to Pechiney ADSs) or
the Stock Election Shares deemed tendered, as the case may be, is not a multiple
of 2 (with respect to Pechiney Common Shares), 20 (with respect to Pechiney
Bonus Allocation Rights) or 4 (with respect to Pechiney ADSs), then the
tendering Pechiney securityholder will receive, in respect of its Pechiney
securities tendered as Mixed Consideration Shares or Stock Election Shares:

     - the number of Alcan Common Shares equal to the product of the number of
       Pechiney securities tendered by the securityholder and the applicable
       exchange ratio (1 Alcan Common Share for 1.67 Pechiney Common Shares or
       16.67 Pechiney Bonus Allocation Rights or 3.33 Pechiney ADSs in respect
       of Mixed Consideration Shares; and 1 Alcan Common Share for 0.67 Pechiney
       Common Shares or 6.67 Pechiney Bonus Allocation Rights or 1.33 Pechiney
       ADSs in respect of Stock Election Shares), rounded down to the nearest
       whole Alcan Common Share; and


     - in lieu of any fractional Alcan Common Share that would otherwise be
       issued, an amount in cash equal to the product of the relevant fraction
       of an Alcan Common Share multiplied by the average sale price on the
       market of the aggregated fractional Alcan Common Shares that would have
       otherwise been issued in the offers. These aggregated fractional Alcan
       Common Shares (rounded down to the nearest whole Alcan Common Share) will
       be sold on the market by a registered intermediary, no later than six
       French trading days following the listing of the Alcan Common Shares on
       Euronext Paris; and


     - as necessary, with respect to Mixed Consideration Shares, that portion of
       the cash consideration payable with respect to Mixed Consideration Shares
       corresponding to the number of Pechiney securities tendered as Mixed
       Consideration Shares multiplied by 24.6, for Pechiney Common Shares, 2.46
       for the Pechiney Bonus Allocation Rights or 12.30 for Pechiney ADSs.

                  PROCEDURES FOR TENDERING PECHINEY SECURITIES


The following are the procedures to tender your Pechiney ADSs, Pechiney Common
Shares, Pechiney OCEANEs or Pechiney Bonus Allocation Rights. The tender
materials described below provide for the election of Alcan Common Shares, cash
or a combination of Alcan Common Shares and cash in exchange for tendered
Pechiney Common Shares, Pechiney Bonus Allocation Rights and Pechiney ADSs in
accordance with the terms of the offer. If you validly tender Pechiney Common
Shares, Pechiney Bonus Allocation Rights or Pechiney ADSs but fail to make an
election, you will be deemed to have elected to receive the standard
consideration with respect to such Pechiney Common Shares, Pechiney Bonus
Allocation Rights or Pechiney ADSs. See "-- Terms of the Offers" on page 52.


                                        65


Procedures for Tendering Pechiney ADSs

Pechiney ADS Certificates.  If you hold Pechiney ADS certificates, you may
tender your Pechiney ADSs by delivering prior to the expiration date the
following materials to the exchange agent at one of its addresses set forth on
the back cover of this prospectus:

     - your Pechiney ADS certificates;

     - a properly completed and duly executed letter of transmittal, or a
       facsimile copy, with any required signature guarantees; and

     - any other documents required by the letter of transmittal, including
       instructions to the Bank of New York, the depositary for the Pechiney
       ADSs, to tender the Pechiney Common Shares underlying the tendered
       Pechiney ADSs as part of the French centralizing procedures within three
       business days after the expiration of the offer period.

Pechiney ADSs in Book-Entry Form.  If you hold your Pechiney ADSs in book-entry
form, you may tender your Pechiney ADSs following the procedure for book-entry
transfer described below. If you tender your Pechiney ADSs in this way, you must
deliver prior to the expiration date the following materials to the exchange
agent at one of its addresses set forth on the back cover of this prospectus:


     - a timely confirmation of a book-entry transfer (a "book-entry
       confirmation") of such Pechiney ADSs into the exchange agent's account at
       the Depository Trust Company, or DTC, pursuant to the procedures
       described below;


     - a properly completed and duly executed letter of transmittal, or a
       facsimile copy, with any required signature guarantees, or an agent's
       message (as defined below); and

     - any other documents required by the letter of transmittal, including
       instructions to The Bank of New York, the depositary for the Pechiney
       ADSs, to tender the Pechiney Common Shares underlying the tendered
       Pechiney ADSs as part of the French centralizing procedures within three
       business days after the expiration of the offer period.

The exchange agent will establish an account with respect to Pechiney ADSs at
DTC for purposes of this offer within two business days after the date of this
prospectus. Any financial institution that is a participant in DTC's systems may
make book-entry delivery of Pechiney ADSs by causing DTC to transfer such
Pechiney ADSs into the exchange agent's account in accordance with DTC's
procedure for the transfer. You must deliver prior to the expiration date to the
exchange agent at one of its addresses set forth on the back cover of this
prospectus (1) the appropriate letter of transmittal, or a facsimile copy
thereof, properly completed and duly executed, together with any required
signature guarantees, or (2) an agent's message in lieu of the letter of
transmittal, and any other required documents. An "agent's message" is a message
transmitted by DTC to, and received by, the exchange agent as part of a
book-entry confirmation. The book-entry confirmation states that DTC has
received an express acknowledgment from the DTC participant tendering the
Pechiney ADSs that such participant has received and agrees to be bound by the
terms of the letter of transmittal and that we may enforce such agreement
against such participant.

Signature Guarantees.  Signatures on all letters of transmittal must be
guaranteed by a firm that is a member of the Medallion Signature Guarantee
Program, or by any other "eligible institution", as such term is defined in Rule
17Ad-15 under the Exchange Act (each of the foregoing is referred to as an
"eligible institution"). Signature guarantees are not required in cases in which
Pechiney ADSs are tendered:


     - by a registered holder of Pechiney ADSs who has not completed either the
       box entitled "Special Issuance Instructions" or the box entitled "Special
       Delivery Instructions" on the letter of transmittal; or


     - for the account of an eligible institution.

                                        66


Pechiney ADSs Held in "Street Name."  If you hold Pechiney ADSs in "street name"
through your broker, bank or custodian, you should contact your broker, bank or
custodian to discuss the appropriate procedures for tendering.

Pechiney ADS Certificates Registered in Another Name.  If a Pechiney ADS
certificate is registered in the name of a person other than the signer of the
letter of transmittal, the certificate representing this security must be
endorsed or accompanied by appropriate stock powers. The stock powers must be
signed exactly as the name or names of the registered owner or owners appear on
the Pechiney ADS certificate, with the signature(s) on the certificates or stock
powers guaranteed as described above.

Partial Tenders.  If you wish to tender fewer than all of the Pechiney ADSs
evidenced by any ADRs delivered to the exchange agent, you must indicate this in
the letter of transmittal by completing the box entitled "Number of Pechiney
ADSs Tendered." In the case of a partial tender, you must surrender the old
Pechiney ADRs to the ADS depositary and withdraw the Pechiney Common Shares
underlying the remainder of the Pechiney ADSs before           , New York City
time on the expiration date. Otherwise, the ADS depositary will automatically
tender your untendered Pechiney ADSs into this offer.

Guaranteed Delivery.  If you desire to tender Pechiney ADSs pursuant to this
offer and your Pechiney ADS certificates are not immediately available or you
cannot deliver such certificates and all other required documents to the
exchange agent prior to the expiration date, or you cannot complete the
procedure for book-entry transfer on a timely basis, you may nevertheless tender
such Pechiney securities provided that all of the following conditions are
satisfied:

     - the tender is made by or through an eligible institution;

     - a properly completed and duly executed notice of guaranteed delivery,
       substantially in the form made available by us, is received by the
       exchange agent as provided below on or prior to the expiration date; and

     - the certificates for your tendered Pechiney securities or a confirmation
       of a book-entry transfer of Pechiney securities into the exchange agent's
       account at DTC as described above, in proper form for transfer, together
       with a properly completed and duly executed transmittal letter or a
       manually executed facsimile copy, with any required signature guarantee
       or, in the case of a book-entry transfer, an agent's message and all
       other documents required by the letter of transmittal, are received by
       the exchange agent within three New York Stock Exchange trading days
       after the date of execution of such notice of guaranteed delivery.

The notice of guaranteed delivery may be delivered by hand or transmitted by
facsimile transmission or mailed to the exchange agent. The notice of guaranteed
delivery must in all cases include a guarantee by an eligible institution in the
form set forth in such notice. Delivery of documents to DTC in accordance with
its procedures does not constitute delivery to the exchange agent.

Procedures for Tendering Pechiney Common Shares

Pechiney Common Shares held through French financial intermediaries.  If your
Pechiney Common Shares are held through a French financial intermediary, you
should not complete the letter of transmittal. Instead, your French financial
intermediary should send you transmittal materials and instructions for
participating in this offer. If you have not yet received instructions from your
French financial intermediary, please contact your French financial intermediary
directly.

Pechiney Common Shares held through U.S. Custodians.  If you hold your Pechiney
Common Shares through a U.S. custodian, you should not complete a letter of
transmittal. Instead, your U.S. custodian should either forward you the
transmittal materials and instructions sent by the French financial intermediary
that holds the shares on behalf of your U.S. custodian as record owner or send a
separate form prepared by your U.S. custodian. If you have not yet received
instructions from your U.S. custodian, please contact your U.S. custodian
directly.

                                        67



If you hold Pechiney Common Shares in pure registered (nominatif pur) form, you
cannot tender them unless you first request that they be converted to
administered registered (nominatif administre) form. If you wish to tender such
shares, you must first make the necessary arrangements, including the execution
of a "mandat d'administration" as prescribed by the CMF, for such conversion
with your French financial intermediary or U.S. custodian, as applicable. The
conversion takes approximately one to five French business days.


Procedures for Tendering Pechiney Bonus Allocation Rights

Pechiney Bonus Allocation Rights held through French financial
intermediaries.  If your Pechiney Bonus Allocation Rights are held through a
French financial intermediary, you should not complete the letter of
transmittal. Instead, your French financial intermediary should send you
transmittal materials and instructions for participating in this offer. If you
have not yet received transmittal materials and instructions from your French
financial intermediary, please contact your French financial intermediary
directly.

Pechiney Bonus Allocation Rights held through U.S. Custodians.  If you hold your
Pechiney Bonus Allocation Rights through a U.S. custodian, you should not
complete a letter of transmittal. Instead, your U.S. custodian should either
forward you the transmittal materials and instructions sent by the French
financial intermediary that holds the shares on behalf of your U.S. custodian as
record owner or send a separate form prepared by your U.S. custodian. If you
have not yet received instructions from your U.S. custodian, please contact your
U.S. custodian directly.


Procedures for Tendering Pechiney OCEANEs


Pechiney OCEANEs held through French financial intermediaries.  If your Pechiney
OCEANEs are held through a French financial intermediary, you should not
complete the letter of transmittal. Instead, your French financial intermediary
should send you transmittal materials and instructions for participating in this
offer. If you have not yet received instructions from your French financial
intermediary, please contact your French financial intermediary directly.

Pechiney OCEANEs held through U.S. Custodians.  If you hold your Pechiney
OCEANEs through a U.S. custodian, you should not complete a letter of
transmittal. Instead, your U.S. custodian should either forward you the
transmittal materials and instructions sent by the French financial intermediary
that holds the shares on behalf of your U.S. custodian as record owner or send a
separate form prepared by your U.S. custodian. If you have not yet received
instructions from your U.S. custodian, please contact your U.S. custodian
directly.


Other Requirements


By executing a letter of transmittal or form of acceptance, you will irrevocably
appoint us or our designees as your attorneys-in-fact and proxies. Your
appointment will be to the full extent of your rights with respect to the
Pechiney securities tendered by you and accepted for exchange by us and any and
all other Pechiney securities issued or issuable in respect of such Pechiney
securities on or after           , 2003. Your appointment will be effective, and
your voting rights will be affected, only when we accept for exchange your
tendered Pechiney securities in accordance with the terms of the offer. Once we
accept for exchange your tendered Pechiney securities, your appointment will be
irrevocable. Upon the effectiveness of your appointment, all prior proxies given
by you will be revoked without further action, and you will not be able to give
powers of attorney, proxies or written consents with respect to the Pechiney
securities tendered by you and accepted by us. Our designees will have the
authority to exercise all your voting and other rights at any meeting of Alcan's
shareholders, by written consent in lieu of any such meeting or otherwise. Alcan
reserves the right to require that, in order for Pechiney securities to be
deemed validly tendered, immediately upon Alcan's acceptance of such Pechiney
securities for exchange, Alcan must be able to exercise all rights of ownership,
including full voting and disposition rights, with respect to such Pechiney
securities.

If the letter of transmittal, form of acceptance, notice of guaranteed delivery
or any certificates or stock powers are signed by trustees, executors,
administrators, guardians, attorneys-in-fact, officers of corporations or other

                                        68


persons acting in a fiduciary or representative capacity, such persons should so
indicate when signing. Proper evidence of authority to act must be submitted by
such persons, although we may waive this requirement.

If any Pechiney Common Share, Pechiney Bonus Allocation Right, Pechiney OCEANE,
Pechiney ADS certificate or other evidence of ownership has been mutilated,
destroyed, lost or stolen, you must (1) furnish to the exchange agent
satisfactory evidence of ownership and of the destruction, loss or theft or such
certificate, (2) indemnify the exchange agent against loss, and (3) comply with
any other reasonable requirements.

Your tender of Pechiney securities pursuant to any of the procedures described
above will constitute your binding agreement with us to the terms and conditions
of this offer.

Determination of Validity

We will determine, in our discretion, all questions as to the validity, form and
eligibility for exchange of any tendered Pechiney securities. Our determination
will be final and binding on the holders of Pechiney securities. We reserve the
absolute right to reject any and all tenders that we determine are not in proper
form. We also reserve the right to waive any defect or irregularity in the
tender or any securities of any particular holder, whether or not similar
defects or irregularities are waived in the case of other securityholders.
Unless otherwise waived by you, your tender of securities will not be valid
until all defects or irregularities have been cured or waived. None of Alcan,
the exchange agent, the information agent, the dealer manager or any other
person will be under any duty to give notification of any defects or
irregularities in the tender of any securities, or incur any liability for
failure to give any such notification. Our interpretation of the terms and
conditions of this offer will be final and binding on the holders of Pechiney
securities.


In addition, in tendering Pechiney securities you will represent and warrant
that you have full power and authority to tender, sell, assign and transfer your
Pechiney securities (and any distributions) and, when the same are accepted for
exchange by Alcan, Alcan will acquire good, marketable and unencumbered title
thereto, free and clear of all liens, restrictions, charges and encumbrances,
and the same will not be subject to any adverse claim. Alcan reserves the right
to reject any Pechiney securities that it determines do not satisfy these
conditions.


                               WITHDRAWAL RIGHTS


You may withdraw Pechiney securities tendered pursuant to this offer at any time
prior to its expiration. If a subsequent offering period is provided, you may
withdraw any Pechiney securities tendered during that subsequent period at any
time prior to its expiration.


For a withdrawal to be effective, the exchange agent must receive a timely
written or facsimile transmission notice of withdrawal at one of its addresses
set forth on the back cover of this prospectus. Any such notice must specify the
name of the person who tendered the Pechiney securities being withdrawn, the
number of Pechiney securities being withdrawn and the name of the registered
holder if different from that of the person who tendered such Pechiney
securities.

If certificates evidencing Pechiney ADSs being withdrawn have been delivered or
otherwise identified to the exchange agent, then, prior to the physical release
of such certificates, (1) the exchange agent also must receive the name of the
registered holder and the serial numbers of the particular certificate
evidencing the Pechiney ADSs and (2) the signature(s) on the notice of
withdrawal must be guaranteed by an eligible institution unless such Pechiney
ADSs have been tendered for the account of an eligible institution. If Pechiney
securities have been tendered pursuant to the procedure for book-entry transfer,
any notice of withdrawal must specify the name and number of the account at DTC
to be credited with the withdrawal of Pechiney ADSs. If you have tendered
Pechiney Common Shares, Pechiney Bonus Allocation Rights or Pechiney OCEANEs,
the notice of withdrawal must specify the name and number of the Euroclear
France account to be credited with the withdrawn Pechiney securities.


Under French law, if, during the period of these offers, another offer for
Pechiney, or an improved bid by a competing bidder, is approved by the CMF, your
tenders of Pechiney securities may be declared null and void


                                        69



by the CMF. In this event, in order to tender your Pechiney securities in this
offer, if it remains outstanding, you will be required to re-tender your
Pechiney securities.



We will determine, in our sole discretion, all questions as to the form and
validity (including time of receipt) of any notice of withdrawal. Our
determination shall be final and binding on the holders of the Pechiney
securities. None of Alcan, the exchange agent, the information agent, the dealer
manager or any other person will be under any duty to give notification of any
defects or irregularities in any notice of withdrawal or incur any liability for
failure to give any such notification. Any Pechiney securities properly
withdrawn will be deemed not to have been validly tendered for purposes of this
offer (or any subsequent offer, as the case may be). However, withdrawn Pechiney
securities may be re-tendered at any time prior to the expiration date by
following the procedures described above under "-- Procedures for Tendering
Pechiney Securities."


                  ACCEPTANCE AND RETURN OF PECHINEY SECURITIES

Subject to the terms and conditions of the offer, we will exchange Pechiney
securities validly tendered and not properly withdrawn for Alcan Common Shares
and/or cash, based on your elections (but only cash in the case of Pechiney
OCEANEs), or return such Pechiney securities as promptly as practicable under
French tender offer practice after the expiration date. Subject to applicable
rules of the SEC, we reserve the right to delay acceptance for exchange, or
delay exchange, of Pechiney securities in order to comply in whole or in part
with any applicable law.

Acceptance of Tendered Pechiney Securities

If the offer is successful, we will be deemed to have accepted for exchange
Pechiney securities validly tendered and not properly withdrawn on the
expiration date, as set forth in the final results of the offers (avis de
resultat definitif) published in France in the French official legal gazette by
the CMF. Subject to the terms and conditions of the offers, the newly issued
Alcan Common Shares will be transferred to the account of the financial
intermediary who tendered the Pechiney securities.

Under no circumstances will interest be paid on the exchange of Pechiney
securities for Alcan Common Shares, regardless of any delay in making the
exchange.

Return of Tendered Pechiney Securities


In case any Pechiney securities tendered in accordance with the instructions set
forth in the offer materials are not accepted for exchange pursuant to the terms
and condition of this offer, we will cause these Pechiney securities to be
returned within one to two French trading days following the announcement of the
lapse or withdrawal of the offers or the publication by the CMF of the results
of the Offers, as the case may be.


Miscellaneous


If we increase the consideration offered to any holder of Pechiney securities
prior to the expiration date, we will pay the increased consideration to all
holders of Pechiney securities that are exchanged in this offer, whether or not
such Pechiney securities were tendered prior to the announcement of such
increase. In such circumstances, the CMF may require an extension of the offer
period and may declare prior tenders invalid from the opening of the increased
offer and require re-tenders. No such increase is currently expected.



           DELIVERY OF ALCAN COMMON SHARES AND CASH; SETTLEMENT DATE



In the event the offers are successful, the exchange agent will deliver Alcan
Common Shares and cash to tendering holders of Pechiney securities following the
publication by the CMF of the final results of the offers for Pechiney
securities. If the offers are consummated, the final settlement date for the
offers is currently expected to be within approximately 12 to 18 French trading
days following the expiration date of the offers. Similarly, in the event of a
subsequent offering period, if any, settlement is expected to occur within 12 to
18 French trading days following the expiration of that subsequent offer period.
With respect to the tendered


                                        70



Pechiney ADSs only, the cash consideration payable in this offer will be paid in
U.S. dollars calculated by converting the applicable amount in euros into U.S.
dollars using the noon buying rate, as published by the Federal Reserve Bank of
New York, on the business day prior to the settlement date.


                               FEES AND EXPENSES

Except as set forth below, we will not pay any fees or commissions to any broker
or other person soliciting tenders of Pechiney securities pursuant to this
offer.

Alcan will pay the brokerage fees and related value added taxes incurred by
Pechiney securityholders tendering into this offer, up to a limit of 0.3% of the
value of each Pechiney security tendered, and subject to a maximum amount of
E150 per account. Pechiney securityholders will not be reimbursed for any
brokerage fees in any event that the offer is withdrawn or lapses. Financial
intermediaries will be paid a fee, net of tax, of E0.50 per Pechiney Common
Share tendered into this offer, up to a maximum amount of E200 per account. This
fee will not be paid in the event that the offer is withdrawn or lapses.

Morgan Stanley is acting as dealer manager in the United States in connection
with this offer and they or certain of their affiliates have provided certain
financial advisory services to Alcan in connection with the transactions. Morgan
Stanley will receive reasonable and customary compensation for its services as
financial advisor and dealer-manager. We will indemnify the financial advisor
against specified liabilities and expenses in connection with this offer,
including liabilities under the U.S. federal securities laws.


We have also retained D.F. King & Co., Inc. to act as information agent in
connection with this offer. The information agent may contact holders of
Pechiney securities by mail, telephone, telex, fax, e-mail and personal
interview and may request brokers, dealers and other nominee shareholders to
forward these offer materials to owners of Pechiney securities. The information
agent will receive reasonable and customary fees for these services, plus
reimbursement of out-of-pocket expenses.



We have retained The Bank of New York to act as exchange agent in connection
with this offer. We will pay the exchange agent reasonable and customary
compensation for its services in connection with this offer, plus reimbursement
for out-of-pocket expenses. We will reimburse brokers, dealers, commercial banks
and trust companies for customary mailing and handling expenses incurred by them
in forwarding material to their customers.


We will indemnify the information agent and the exchange agent against certain
liabilities and expenses in connection with this offer, including liabilities
under the U.S. federal securities laws.

Indemnification for liabilities under the U.S. federal securities laws may be
unenforceable as against public policy.

The cash expenses to be incurred in connection with this offer will be paid by
Alcan and are estimated in the aggregate to be approximately $92 million. Such
expenses include registration fees, fees and expenses of the financial advisor
and dealer-manager, exchange agent and information agent, accounting and legal
fees and printing costs, among others.

                         LISTING OF ALCAN COMMON SHARES


Alcan Common Shares are currently listed on the New York, Toronto, London and
Swiss stock exchanges. Alcan will apply to list its Alcan Common Shares on
Euronext Paris, subject to the successful completion of these offers and with a
view to the Euronext Paris listing being effective on the settlement date of
these offers. Alcan will also apply for the supplemental listing of the Alcan
Common Shares to be issued in these offers on the New York, Toronto, Paris,
London and Swiss stock exchanges, and will comply with all of the usual
requirements of such exchanges within the time periods specified by such
exchanges.


                                        71



  TREATMENT OF PECHINEY STOCK PURCHASE OPTIONS AND PECHINEY STOCK SUBSCRIPTION
                                    OPTIONS



If you are the holder of exercisable Pechiney stock purchase options or Pechiney
stock subscription options and you would like to tender the underlying Pechiney
Common Shares into this offer, you must exercise the options such that the
relevant Pechiney Common Shares are credited to your account on or prior to the
expiration date of the offers.



Alcan has not had access to important information relating to Pechiney's stock
option plans, including the terms of these plans. If these offers are
successful, Alcan will propose to holders of Pechiney stock purchase options and
stock subscription options that were not exercised during the offer period
either (i) an undertaking to purchase or exchange, at the termination of the
transfer restriction period, the Pechiney Common Shares received as a result of
exercising the options, or (ii) Alcan stock options in exchange for the
cancellation of existing Pechiney stock purchase options or stock subscription
options. Alcan will determine which of these two proposals will be offered, and
the precise terms and conditions of the offer, when it has had the opportunity
to review the current status of Pechiney's stock option plans.



               TREATMENT OF PECHINEY'S EMPLOYEE SHAREHOLDING PLAN



Alcan has not had access to important information relating to Pechiney's
Employee Shareholding Plan. According to Pechiney's 2002 20-F, several Pechiney
mutual investment funds have been created to manage this employee savings plan.
In the event that any of these mutual investment funds is not able to tender any
Pechiney securities into these offers prior to their expiration, or, if
applicable, prior to the expiration of any subsequent offer period, and if the
offers are successful, Alcan will consider possible alternatives that may allow,
subject to applicable law and regulation, these mutual investment funds to
transfer their Pechiney securities to Alcan on same terms as in these offers.



In the event that a Pechiney employee that holds his or her Pechiney securities
under the Employee Shareholding Plan directly is restricted from tendering any
of such employee's Pechiney securities into these offers prior to their
expiration, or, if applicable, prior to the expiration of any subsequent offer
period, and if the offers are successful, Alcan will offer to purchase or
exchange these Pechiney securities, to the extent permitted by applicable
regulation and at the end of any restricted period. Alcan will determine the
terms and conditions of any offer to purchase these Pechiney securities when it
has had the opportunity to review the current status of these securityholders,
although the terms will be based on the terms of these offers.


                       FUTURE DIVIDEND POLICY OF PECHINEY

Alcan is not in a position at this stage to state what their dividend policy
will be in respect of Pechiney securities after successful offers, but it is
likely that such policy will be determined in the context of Pechiney's
integration into the combined entities. This policy could bring about a large
reduction in the level of dividends paid by Pechiney, or an end to dividends
being paid.

                              REGULATORY APPROVALS


Completion of the offers is conditional upon receipt of merger control approvals
from the European Commission and, if applicable, any Relevant National
Authorities to whom the Commission has referred jurisdiction to review all or
part of the transaction and the termination or expiration of the waiting period
under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended.
There can be no assurance that the necessary approvals or clearances will be
granted or that they will be granted on favorable terms. It is possible that
certain merger control approvals or clearances will be subject to conditions and
obligations, which may include the disposal of certain significant assets or
businesses, as discussed further under "-- Reasons for the Offers -- Commitments
Offered to the European Commission to Obtain Regulatory Approval" beginning on
page 36. It is possible that such conditions and obligations will have a
material effect on certain of the financial assumptions upon which the
information in this prospectus is based. We may choose to proceed with the
offers even though we are required to comply with such conditions and
obligations.


                                        72



The offers are also subject to the prior approval of France's Minister of the
Economy, Finance and Industry. See "Regulatory Matters -- Investment Controls"
on page 97.


    COMPARISON OF THE RIGHTS OF PECHINEY SHAREHOLDERS AND ALCAN SHAREHOLDERS


You will receive Alcan Common Shares if you tender your Pechiney securities in
the offer. There are numerous differences between the rights of a shareholder in
Pechiney, a French societe anonyme, and the rights of a shareholder in Alcan, a
Canadian corporation. We urge you to review the discussion under "Comparison of
Shareholders' Rights" beginning on page 101 for a summary of these differences.


                              ACCOUNTING TREATMENT

The acquisition of the Pechiney securities will be accounted for using the
purchase method under both Canadian and U.S. GAAP. Under the purchase method,
the cost of the purchase will be based on the cash paid to Pechiney
securityholders, the market value of Alcan Common Shares issued to Pechiney
securityholders, fair value of any stock options of Pechiney replaced with stock
options of Alcan and the direct transaction costs. In Alcan's consolidated
financial statements, the cost of the purchase will be allocated to the Pechiney
assets acquired and liabilities assumed, based on their estimated fair values at
the acquisition date, with any excess of the cost over the amounts allocated
being recognized as goodwill. This method may result in the carrying value of
assets, including goodwill, acquired from Pechiney being substantially different
from the former carrying values of those assets.

                                        73


                                    TAXATION


This section describes the material United States federal income, French and
Canadian tax consequences of exchanging your Pechiney securities pursuant to
this offer and the material United States federal income and Canadian tax
consequences of owning and disposing of Alcan Common Shares acquired pursuant to
this offer. It applies to you only if you hold your Pechiney securities, and
will hold your Alcan Common Shares, as a capital asset for United States federal
income tax purposes. This section is the opinion of Sullivan & Cromwell LLP
insofar as it relates to United States federal income and French tax law, and is
the opinion of Hugh Berwick, Alcan's senior tax counsel, insofar as it relates
to matters of Canadian tax law. This section does not apply to you if you are a
resident of France for French tax purposes, or a member of a special class of
holders subject to special rules, including, with respect to the French or
United States federal income tax consequences:


     - a dealer in securities or currencies,

     - a trader in securities that elects to use a mark-to-market method of
       accounting for securities holdings,

     - a tax-exempt organization,

     - a life insurance company,

     - a holder of Pechiney OCEANEs that is a bank,

     - a person liable for alternative minimum tax,

     - with respect to the tax consequences of exchanging Pechiney Common
       Shares, Pechiney Bonus Allocation Rights or Pechiney ADSs, a person that
       actually or constructively owns 10% or more of Pechiney voting stock;

     - with respect to the tax consequences of owning and disposing of Alcan
       Common Shares, a person that actually or constructively will own 10% or
       more of Alcan voting stock after the exchange,

     - with respect to French taxation, a person that together with his or her
       spouse, if any, and their ascendants and descendants, directly or
       indirectly, hold or have held more than 25% of the rights to Pechiney's
       earnings (droits aux benefices sociaux) at any time during the five years
       preceding the exchange,

     - a person that holds Pechiney securities, or, after the exchange, will
       hold Alcan Common Shares, as part of a straddle or a hedging or
       conversion transaction, and

     - a U.S. holder (as defined below) whose functional currency is not the
       U.S. dollar.

This section is based on the United States Internal Revenue Code of 1986, as
amended, its legislative history, existing and proposed regulations, published
rulings and court decisions, and the French tax laws, as well as on the income
tax conventions between the United States of America and the Republic of France
(the "French Treaty") and between the United States of America and Canada (the
"Canadian Treaty"), all as currently in effect. With respect to Canadian tax
matters, it is further based on the current provisions of the Income Tax Act
(Canada) (the "ITA"), the regulations thereunder, specific proposals to amend
the ITA, the regulations announced before the date of this prospectus and the
current administrative and assessing practices of the Canada Customs and Revenue
Agency. All of these laws are subject to change, possibly on a retroactive
basis.

You are a non-resident of France for French tax purposes if you are a beneficial
owner of Pechiney securities that exchanges its Pechiney securities for Alcan
Common Shares, cash or a combination of both pursuant to this offer, and, for
French income tax purposes, you are not:

     - an individual (i) whose principal residence is located in France or who
       resides in France for more than 183 days during a year, (ii) maintains
       his or her household in France, (iii) carries out his or her principal
       professional activity in France, or (iv) whose principal center of
       economical interests is located in France, or

     - an enterprise with its registered office located in France or operating a
       business in France.
                                        74


You are a U.S. holder if you are a beneficial owner of Pechiney securities that
exchanges its Pechiney securities for Alcan Common Shares, cash or a combination
of both pursuant to this offer, and you are for United States federal income tax
purposes:

     - a citizen or resident of the United States,

     - a United States domestic corporation,

     - an estate whose income is subject to United States federal income tax
       regardless of its source, or

     - a trust if a United States court can exercise primary supervision over
       the trust's administration and one or more United States persons are
       authorized to control all substantial decisions of the trust.

You are a non-U.S. holder if you are a beneficial owner of Pechiney securities
that exchanges Pechiney securities for Alcan Common Shares, cash or a
combination of both pursuant to this offer, and you are not a United States
person for United States federal income tax purposes.

You are a non-Canadian holder if you are a beneficial owner of Pechiney
securities that exchanges Pechiney securities for Alcan Common Shares, cash or a
combination of both pursuant to this offer and at any relevant time

     - you are not and are not deemed to be resident in Canada for purposes of
       the ITA;

     - you do not hold or use and are not deemed to hold or use the Pechiney
       securities in a business carried on in Canada; and

     - you are not an insurer carrying on business in Canada and elsewhere.

YOU SHOULD CONSULT YOUR OWN TAX ADVISOR REGARDING THE UNITED STATES FEDERAL,
STATE AND LOCAL, AND THE CANADIAN, FRENCH AND OTHER TAX CONSEQUENCES OF
EXCHANGING YOUR PECHINEY SECURITIES AND OF OWNING AND DISPOSING OF ALCAN COMMON
SHARES IN YOUR PARTICULAR CIRCUMSTANCES. IN PARTICULAR, YOU SHOULD CONFIRM
WHETHER YOU ARE ELIGIBLE FOR THE BENEFITS OF THE FRENCH TREATY OR CANADIAN
TREATY WITH YOUR ADVISOR AND SHOULD DISCUSS ANY POSSIBLE CONSEQUENCES OF FAILING
TO BE SO ELIGIBLE.

This section does not constitute legal or tax advice to any particular holder of
Pechiney securities.

               TAX CONSEQUENCES OF EXCHANGING PECHINEY SECURITIES

FRENCH TAXATION

Pechiney securities exchanged for cash or a combination of Alcan Common Shares
and cash if the cash received in the exchange exceeds 10% of the nominal value
of the Alcan Common Shares received

For French income tax purposes, if you are a French non-resident, you will not
be subject to French tax on any capital gain or loss recognized upon exchanging
your Pechiney securities for cash or a combination of Alcan Common Shares and
cash, unless you have a permanent establishment or fixed base in France and the
Pechiney securities exchanged is part of the business property of that permanent
establishment or fixed base. In that case, the gain or loss, if any, generally
will equal the difference between the value of the Alcan Common Shares and any
cash received, and your adjusted tax basis in your Pechiney securities
exchanged. Such gain or loss would be recognized upon the exchange and subject
to French income tax under the ordinary rules.

Pechiney securities exchanged for Alcan Common Shares or a combination of Alcan
Common Shares and cash if the cash received in the exchange does not exceed 10%
of the nominal value of the Alcan Common Shares received

For French income tax purposes, if you are a French non-resident, you will not
be subject to French tax on any capital gain or loss recognized upon exchanging
your Pechiney securities for Alcan Common Shares or a

                                        75


combination of Alcan Common Shares and cash, unless you have a permanent
establishment or fixed base in France and the Pechiney securities exchanged is
part of the business property of that permanent establishment or fixed base.

If that were the case, you will generally be

     - subject to French tax under the ordinary rules on the gain realized upon
       exchanging a Pechiney Bonus Allocation Right, a Pechiney OCEANE or a
       Pechiney ADS, and

     - subject to deferred French taxation, until future disposal of your Alcan
       Common Share,

       - on the gain realized upon exchanging a Pechiney Common Share, if you
         are an individual, or

       - on any portion of gain exceeding the amount of cash received, if you
         are a corporation, and the portion of gain up to or equal to the amount
         of cash received will be subject to corporate income tax at the normal
         rate at the time of the exchange.

The amount subject to deferred French taxation will be determined by reference
to your tax basis in your Pechiney Common Share exchanged.

CANADIAN TAXATION

A non-Canadian holder will not be subject to Canadian federal tax in respect of
any gain or loss realized on Pechiney securities exchanged in the offer. In
addition, a person that is resident of Canada for purposes of the ITA, but that
is resident of the United States for purposes of the Canadian Treaty and is
otherwise eligible for the benefits of the Canadian Treaty, will not be subject
to Canadian federal tax in respect of any gain or loss realized on Pechiney
securities exchanged in the offer, provided that such person does not hold the
Pechiney securities in a manner that is effectively connected with or pertains
to a permanent establishment (as defined in the Canadian Treaty) through which
the holder carries on business in Canada or a fixed base through which the
holder performs independent personal services in Canada.

UNITED STATES FEDERAL INCOME TAXATION

U.S. HOLDERS.  If you are a U.S. holder, you will recognize capital gain or
loss, if any, as a result of exchanging a Pechiney Common Share, Pechiney Bonus
Allocation Right or Pechiney ADS for Alcan Common Shares, cash or a combination
of both equal to the difference between

     - the sum of the value of any Alcan Common Shares, determined in U.S.
       dollars, and the amount of any cash payment you receive in the exchange
       and

     - your tax basis, determined in U.S. dollars, in the Pechiney Common Share,
       Pechiney Bonus Allocation Right or Pechiney ADS that you exchange.

For this purpose, the value of any Alcan Common Shares received will equal the
fair market value of such shares on the date of the exchange, determined in U.S.
dollars. You should generally be able to treat the mean between the highest and
lowest selling prices of Alcan Common Shares on the date of exchange on the
stock exchange where Alcan Common Shares are principally traded as the fair
market value of an Alcan Common Share on the date of exchange. Alcan believes
that, for this purpose, the New York Stock Exchange should be treated as the
stock exchange where Alcan Common Shares are principally traded.

If you receive any Alcan Common Shares pursuant to this offer, your tax basis in
each such share immediately after the exchange will equal its fair market value
and your holding period in each such share will begin on the day after the
exchange date.

If you exchange a Pechiney OCEANE for cash, you will be required to include in
ordinary income any cash that is attributable to accrued but unpaid interest on
the Pechiney OCEANE and any original issue discount that has accrued on the
Pechiney OCEANE prior to the exchange. You will recognize gain or loss, if any,
in the exchange equal to the difference between

                                        76


     - the amount of the cash payment you receive in the exchange, reduced by
       the portion of the cash payment that is attributable to accrued interest,
       and

     - your adjusted tax basis, determined in U.S. dollars and after taking into
       account any original issue discount that has accrued prior to the
       exchange, in the Pechiney OCEANE that you exchange.

Any such gain or loss will generally be capital gain or loss except that (a) any
gain or loss that is attributable to changes in the U.S. dollar/euro exchange
rate during the period in which you held your Pechiney OCEANE will be ordinary
income or loss and (b) if you purchased your Pechiney OCEANE with market
discount in excess of a de minimis amount, any gain that you recognize will be
ordinary income to the extent of any accrued market discount on your Pechiney
OCEANE that you have not yet included in income.

For foreign tax credit purposes, gain or loss that you recognize upon an
exchange of Pechiney securities for Alcan Common Shares, cash or a combination
of both generally will be income or loss from sources within the United States
if such gain or loss is capital gain or loss or ordinary gain or loss that is
attributable to changes in the U.S. dollar/euro exchange rate. Any original
issue discount and accrued interest that you include in income with respect to a
Pechiney OCEANE will generally be treated as income from sources outside the
United States and any market discount that you include in income with respect to
a Pechiney OCEANE will likely be treated as income from sources outside the
United States. Any gain or loss that you recognize upon an exchange of Pechiney
securities for Alcan Common Shares, cash or a combination of both will generally
be treated as "passive income" or, in certain cases, "financial services
income," which is treated separately from other types of income for foreign tax
credit limitation purposes.

If you are a noncorporate U.S. holder, capital gain will be taxable at a maximum
rate of 15% if your holding period in the Pechiney security that you exchange
exceeds one year on the date of exchange. The deductibility of capital losses is
subject to limitations.

If you recognize a loss upon an exchange of a Pechiney OCEANE for cash and the
portion of such loss that is attributable to changes in the U.S. dollar/euro
exchange rate is $50,000 or more, then you may be required to specially report
such loss on Internal Revenue Service Form 8886. You should consult with your
tax advisor as to whether you will be subject to any such reporting obligation.

NON-U.S. HOLDERS. Except as otherwise described below with respect to amounts
received in respect of accrued interest, if you are a non-U.S. holder, you will
not be subject to United States federal income tax on any gain or loss
recognized as a result of exchanging your Pechiney securities for Alcan Common
Shares, cash or both unless

     - the gain or loss is "effectively connected" with your conduct of a trade
       or business in the United States, and the gain is attributable to a
       permanent establishment that you maintain in the United States if that is
       required by an applicable income tax treaty as a condition for subjecting
       you to United States taxation on a net income basis, or

     - you are an individual who is present in the United States for at least
       183 days in the taxable year of the sale and

      - your "tax home" for United States federal income tax purposes is in the
        United States or

      - the gain is attributable to an office or other fixed place of business
        that you maintain in the United States.

If you are a non-U.S. holder of a Pechiney OCEANE, the amount of cash received
in exchange for your Pechiney OCEANE that is attributable to accrued interest is
exempt from United States federal income tax, whether or not you are engaged in
a trade or business in the United States, unless

     - you are an insurance company carrying on a United States insurance
       business to which the interest is attributable, within the meaning of the
       Internal Revenue Code, or

                                        77


     - you both

      - have an office or other fixed place of business in the United States to
        which the interest is attributable and

      - derive the interest in the active conduct of a banking, financing or
        similar business within the United States.

If you are a corporate non-U.S. holder that under the rules described above is
subject to United States federal income tax on the exchange of your Pechiney
securities, you may also, under certain circumstances, be subject to an
additional branch profits tax at a 30% rate or at a lower rate if you are
eligible for the benefits of an income tax treaty that provides for a lower
rate.

        TAX CONSEQUENCES OF OWNING AND DISPOSING OF ALCAN COMMON SHARES

TAXATION OF DIVIDENDS

CANADIAN TAXATION

Dividends (including deemed dividends) on Alcan Common Shares paid to a
non-Canadian holder will generally be subject to a Canadian non-resident
withholding tax. The general withholding tax rate of 25% may be reduced pursuant
to the provisions of a treaty entered into between Canada and the country in
which the recipient or beneficial owner of such dividends is a resident. Under
the Canadian Treaty the rate of such Canadian non-resident withholding tax is
reduced to 15%. In addition, under the Canadian Treaty, dividends on Alcan
Common Shares paid to certain pension, retirement or charitable organizations
that are eligible for the benefits of the Canadian Treaty and exempt from tax in
the United States will generally be exempt from Canadian withholding tax.

UNITED STATES FEDERAL INCOME TAXATION

U.S. HOLDERS.  Under the United States federal income tax laws, if you are a
U.S. holder, the gross amount of any dividend Alcan pays with respect to its
Alcan Common Shares to you out of its current or accumulated earnings and
profits (as determined for United States federal income tax purposes) is subject
to United States federal income taxation. If you are a noncorporate U.S. holder,
dividends paid to you in taxable years beginning before January 1, 2009 that
constitute qualified dividend income will be taxable to you at a maximum tax
rate of 15% provided that you hold the Alcan Common Shares for more than 60 days
during the 120-day period beginning 60 days before the ex-dividend date and meet
other holding period requirements. Dividends Alcan pays with respect to Alcan
Common Shares generally will be qualified dividend income.

You must include any Canadian tax withheld from the dividend payment in this
gross amount even though you do not in fact receive it. The dividend is taxable
to you when you receive it, actually or constructively. The dividend will not be
eligible for the dividends-received deduction generally allowed to United States
corporations in respect of dividends received from other United States
corporations. Distributions with respect to Alcan Common Shares in excess of
Alcan's current and accumulated earnings and profits, as determined for United
States federal income tax purposes, will be treated as a non-taxable return of
capital to the extent of your basis in the Alcan Common Shares and thereafter as
capital gain.

Subject to certain limitations, the Canadian tax withheld in accordance with the
Treaty and paid over to Canada will be creditable against your United States
federal income tax liability. Special rules apply in determining the foreign tax
credit limitation with respect to dividends that are subject to the maximum 15%
tax rate. To the extent a refund of the tax withheld is available to you under
Canadian law or under the Treaty, the amount of tax withheld that is refundable
will not be eligible for credit against your United States federal income tax
liability.


Dividends will generally be income from sources outside the United States, but
generally will be "passive income" or "financial services income," which is
treated separately from other types of income for purposes of computing the
foreign tax credit allowable to you.

                                        78


NON-U.S. HOLDERS.  If you are a non-U.S. holder, dividends paid to you in
respect of Alcan Common Shares will not be subject to United States federal
income tax unless the dividends are "effectively connected" with your conduct of
a trade or business within the United States, and the dividends are attributable
to a permanent establishment that you maintain in the United States if that is
required by an applicable income tax treaty as a condition for subjecting you to
United States taxation on a net income basis. In such cases you generally will
be taxed in the same manner as a U.S. holder. If you are a corporate non-U.S.
holder, "effectively connected" dividends may, under certain circumstances, be
subject to an additional "branch profits tax" at a 30% rate or at a lower rate
if you are eligible for the benefits of an income tax treaty that provides for a
lower rate.

TAXATION OF CAPITAL GAINS

CANADIAN TAXATION

Gains realized by a non-Canadian holder on a sale or other disposition of Alcan
Common Shares generally will not be subject to Canadian tax unless such shares
constitute "taxable Canadian property" to such non-Canadian holder. The Alcan
Common Shares may constitute "taxable Canadian property" to a non-Canadian
holder if:

     - they are held or used in a business carried on in Canada; or

     - at any time in the five years immediately preceding the disposition, the
       non-Canadian holder, persons with whom the non-Canadian holder did not
       deal at arm's length, or the non-Canadian holder and such non-arm's
       length persons, owned or had under any option or right to acquire 25% or
       more of the issued shares of any class or series of the capital stock of
       Alcan.

Even where the Alcan Common Shares constitute "taxable Canadian Property" to a
non-Canadian holder, the gain from the sale or disposition of such shares may
also be exempt from Canadian tax pursuant to the provisions of a treaty entered
into by Canada and another country. Under the Canadian Treaty, such gain will
generally be exempt from Canadian tax unless the Alcan Common Shares derive
their value principally from real property situated in Canada (as defined in the
Canadian Treaty).

A disposition of Alcan Common Shares to Alcan (unless the shares are acquired in
the open market in the manner in which shares would normally be purchased by any
member of the public) will result in a deemed dividend to a non-Canadian holder
equal to the amount by which the consideration paid by Alcan for the Alcan
Common Shares exceeds the paid-up capital of such shares for purposes of the
ITA. The amount of such deemed dividend will be subject to the withholding tax
described under "-- Taxation of Dividends -- Canadian Taxation" above.

UNITED STATES FEDERAL INCOME TAXATION

U.S. HOLDERS.  If you are a U.S. holder and you sell or otherwise dispose of
your Alcan Common Shares received pursuant to this offer, you will recognize
capital gain or loss for United States federal income tax purposes equal to the
difference between the U.S. dollar value of the amount that you realize and your
adjusted tax basis, determined in U.S. dollars, in your Alcan Common Shares. See
"Tax Consequences of Exchanging Pechiney Securities -- United States Federal
Income Taxation" above for your initial tax basis in, and the start of your
holding period of, the Alcan Common Shares received pursuant to this offer.
Capital gain of a noncorporate U.S. holder that is recognized before January 1,
2009 is generally taxed at a maximum rate of 15% where the holder has a holding
period greater than one year. The gain or loss will generally be income or loss
from sources within the United States for foreign tax credit limitation
purposes.

NON-U.S. HOLDERS.  If you are a non-U.S. holder, you will not be subject to
United States federal income tax on gain recognized on the sale or other
disposition of your Alcan Common Shares unless:

     - the gain is "effectively connected" with your conduct of a trade or
       business in the United States, and the gain is attributable to a
       permanent establishment that you maintain in the United States if that is
       required by an applicable income tax treaty as a condition for subjecting
       you to United States taxation on a net income basis, or

                                        79


     - you are an individual, you are present in the United States for 183 or
       more days in the taxable year of the sale and

       - your "tax home" for United States federal income tax purposes is in the
         United States or

       - the gain is attributable to an office or other fixed place of business
         that you maintain in the United States.

If you are a corporate non-U.S. holder, "effectively connected" gains that you
recognize may also, under certain circumstances, be subject to an additional
"branch profits tax" at a 30% rate or at a lower rate if you are eligible for
the benefits of an income tax treaty that provides for a lower rate.

                  BACKUP WITHHOLDING AND INFORMATION REPORTING

If you are a noncorporate U.S. holder, information reporting requirements, on
Internal Revenue Service Form 1099, generally will apply to:

     - dividend payments or other taxable distributions made to you within the
       United States,

     - cash payments made to you pursuant to an exchange of Pechiney securities
       for cash pursuant to this offer, and

     - the payment of proceeds to you from the sale of Alcan Common Shares
       effected at a United States office of a broker.

Additionally, backup withholding may apply to such payments if you are a
noncorporate U.S. holder that:

     - fails to provide an accurate taxpayer identification number,

     - is notified by the Internal Revenue Service that you have failed to
       report all interest and dividends required to be shown on your federal
       income tax returns, or

     - in certain circumstances, fails to comply with applicable certification
       requirements.

If you are a non-U.S. holder, you are generally exempt from backup withholding
and information reporting requirements with respect to:

     - dividend payments made to you outside the United States by Alcan or
       another non-United States payor and

     - other dividend payments and the payment of the proceeds from the sale of
       Alcan Common Shares effected at a United States office of a broker, as
       long as the income associated with such payments is otherwise exempt from
       United States federal income tax, and:

     - the payor or broker does not have actual knowledge or reason to know that
       you are a United States person and you have furnished the payor or
       broker:

       - an Internal Revenue Service Form W-8BEN or an acceptable substitute
         form upon which you certify, under penalties of perjury, that you are a
         non-United States person, or

       - other documentation upon which it may rely to treat the payments as
         made to a non-United States person in accordance with U.S. Treasury
         regulations, or

     - you otherwise establish an exemption.

Payment of the proceeds from the sale of Alcan Common Shares effected at a
foreign office of a broker generally will not be subject to information
reporting or backup withholding. However, a sale of Alcan

                                        80


Common Shares that is effected at a foreign office of a broker will be subject
to information reporting and backup withholding if:

     - the proceeds are transferred to an account maintained by you in the
       United States,

     - the payment of proceeds or the confirmation of the sale is mailed to you
       at a United States address, or

     - the sale has some other specified connection with the United States as
       provided in U.S. Treasury regulations,

unless the broker does not have actual knowledge or reason to know that you are
a United States person and the documentation requirements described above are
met or you otherwise establish an exemption.

In addition, a sale of Alcan Common Shares effected at a foreign office of a
broker will be subject to information reporting if the broker is:

     - a United States person,

     - a controlled foreign corporation for United States tax purposes,

     - a foreign person 50% or more of whose gross income is effectively
       connected with the conduct of a United States trade or business for a
       specified three-year period, or

     - a foreign partnership, if at any time during its tax year:

       - one or more of its partners are "U.S. persons", as defined in U.S.
         Treasury regulations, who in the aggregate hold more than 50% of the
         income or capital interest in the partnership, or

       - such foreign partnership is engaged in the conduct of a United States
         trade or business,

unless the broker does not have actual knowledge or reason to know that you are
a United States person and the documentation requirements described above are
met or you otherwise establish an exemption. Backup withholding will apply if
the sale is subject to information reporting and the broker has actual knowledge
that you are a United States person.

You generally may obtain a refund of any amounts withheld under the backup
withholding rules that exceed your income tax liability by filing a refund claim
with the United States Internal Revenue Service.

                                        81


                            INFORMATION ABOUT ALCAN

BUSINESS DESCRIPTION


Alcan is the parent company of an international group involved in many aspects
of the aluminum and packaging industries. Through subsidiaries, joint ventures
and related companies around the world, the activities of Alcan include bauxite
mining, alumina refining, production of chemicals, power generation, aluminum
smelting, manufacturing, recycling, packaging, as well as research and
development. Alcan employs approximately 54,000 people.


In the 101 years since it was established, Alcan has developed a unique
combination of competitive strengths. Alcan is a multicultural and multilingual
market-driven company reflecting the differing corporate and social
characteristics of the 42 countries in which it operates. Alcan is one of the
most international aluminum and packaging companies and is the global leader in
the production and sale of rolled aluminum products.

Alcan's six operating segments are:

BAUXITE, ALUMINA AND SPECIALTY CHEMICALS, headquartered in Montreal, Canada,
comprising Alcan's worldwide activities related to bauxite mining, alumina
refining and the production of specialty chemicals, operating seven bauxite
mines and deposits in five countries and five alumina plants in three countries;

PRIMARY METAL, also headquartered in Montreal, comprising smelting operations,
power generation and production of primary value-added ingot in the form of
sheet ingot, extrusion billet, rod and foundry ingot, as well as engineering
services and trading operations for alumina and aluminum, operating or having
interests in 16 smelters in seven countries;

ROLLED PRODUCTS AMERICAS AND ASIA, headquartered in Cleveland, Ohio, U.S.A.,
encompassing aluminum sheet and light gauge products, operating 16 plants in six
countries;

ROLLED PRODUCTS EUROPE, headquartered in Zurich, Switzerland, comprising
aluminum sheet, including automotive, can and lithographic sheet, plate and foil
stock operating 11 plants in four countries;

ENGINEERED PRODUCTS, headquartered in Neuhausen, Switzerland, producing
fabricated aluminum products, including wire and cable, components for the mass
transportation, automotive, building, display, eletromechanical and other
industrial markets, as well as sales and service centers throughout Europe,
operating 47 plants in 17 countries; and

PACKAGING, also headquartered in Zurich, consisting of Alcan's worldwide food
flexible, foil, specialty, pharmaceutical and cosmetics packaging businesses,
operating 76 plants in 14 countries.

Alcan's corporate head office, located in Montreal, focuses on strategy
development and capital deployment, while overseeing governance, policy, legal,
compliance, human resources and finance matters.

HISTORY

Alcan is a limited liability Canadian company, incorporated on June 3, 1902,
with its headquarters and registered office in Montreal, Canada. It was formed
as a subsidiary of the Pittsburgh Reduction Company, one of the founding
companies of the aluminum industry, to establish a smelter and hydroelectric
power facility in Shawinigan, Quebec. In 1928, the international operations and
domestic U.S. operations were separated into two competing companies that became
Alcan and Alcoa Inc., respectively. During the Second World War, substantial
expansion of hydroelectric and smelting capacity took place in Quebec to supply
aluminum for the war effort. In the 1950s, Alcan added hydroelectric and
smelting in British Columbia. During the postwar period, Alcan expanded
internationally and invested in fabricating activities to stimulate demand for
its primary metal production.

In 2000, Alcan entered into a combination agreement with algroup, which
consisted of an independent offer of Alcan Common Shares for all of the
outstanding shares of algroup. On October 17, 2000, after clearance from
competition authorities, the combination was completed with Alcan acquiring over
99% of the shares of algroup by virtue of its offer. Alcan acquired the
remaining shares in algroup in 2001 by virtue of statutory right and caused
algroup to de-list from the SWX Swiss Exchange.

Today, Alcan is a multinational company engaged in all aspects of the aluminum
and packaging industries on an international scale.

                                        82


                           INFORMATION ABOUT PECHINEY

BUSINESS DESCRIPTION

Pechiney operates in two core businesses (positions and market shares presented
in this section are based on internal estimates of Pechiney as discussed in
Pechiney's publicly available disclosure): the production of primary aluminum
and fabricated aluminum products and the production of packaging materials.
Pechiney's aluminum technology is recognized as a world leader. Pechiney
believes that it is also one of the world leaders in the production of packaging
materials for the food, healthcare and beauty industries on the basis of 2002
sales. It is the world's largest producer of collapsible tubes. Pechiney's other
activities include the production of ferroalloys and international trade.

ALUMINUM:  Pechiney's aluminum business is comprised of two segments: Primary
Aluminum Metal and Aluminum Conversion.

Primary Aluminum is Europe's second and the world's fifth largest producer of
primary aluminum on the basis of 2002 obtainable production capacity. It also
holds interests in companies that produce bauxite and alumina. Primary Aluminum
also licenses alumina and aluminum production technology and related equipment.

Aluminum Conversion includes the activities of four divisions:

     - The Aerospace, Transport, Industry division includes the production of
       aluminum rolled products for transport markets (aerospace, sea and
       ground, excluding automotive) and industry, as well as the production of
       hard alloy extrusions;

     - The Cans, Automotive, Standard Rolled Products division includes the
       production of aluminum rolled products at Neuf Brisach for the can,
       automotive and standard rolled products market;

     - The Foil and Thin Foil/Specialty Products division includes Pechiney
       Eurofoil's foil and thin foil activities at Dudelange, Flemalle and
       Rugles, as well as different specialty activities (circles, precoated
       sheets, etc.);

     - The Extrusions, Casting Alloys, Automotive division manufactures and
       markets aluminum soft alloy sections for the construction, transport and
       equipment markets, as well as casting alloys used almost exclusively in
       the automotive market. The division is also in charge of Pechiney
       Automotive, a cross-division structure specially dedicated to the
       automotive market.

PACKAGING:  In 2002, Pechiney's Packaging sector included the following
activities:

     - Plastic Packaging, an important North American and European producer of
       flexible packaging for the food, healthcare and specialty markets;

     - Cebal Tubes Europe and Cebal Tubes Americas, which together are the world
       leader in the manufacture of flexible plastic, laminated and aluminum
       tubes for the cosmetics, personal care and healthcare markets on the
       basis of 2002 production;

     - Cebal Aerosols, the world's largest manufacturer of seamless aluminum
       aerosol and spray cans;

     - Techpack International (TPI), one of the world's principal producers of
       plastic packaging for makeup, perfume and cosmetics on the basis of 2002
       sales;

     - Pechiney Capsules, which produces caps and overcaps for wines and
       spirits.

OTHER ACTIVITIES:  Pechiney's other business also includes Ferroalloys, where
Pechiney mainly produces silicon and ferroalloys as well as abrasives and
refractories, and International Trade, where Pechiney operates the following
three lines of business: a worldwide network of sales agencies, which markets
products manufactured by Pechiney and third parties; a non-ferrous metal and
other basic material trading operation; and the distribution of semi-finished
aluminum products.

                                        83


NEW ORGANIZATION:  The aluminum activities of Pechiney were divided, effective
as of February 1, 2003, into two distinct sectors:

     - the Primary Aluminum sector, which includes in a single entity
       bauxite-alumina-aluminum production activities and ferroalloys;

     - the Aluminum Conversion sector, comprised of rolled products, extrusions
       and casting alloys used in a wide variety of markets: aerospace,
       automotive, sea transport, rail, industry, industrial equipment,
       construction and beverage cans.

CONVERSION OF PECHINEY PREFERRED SHARES "B" TO PECHINEY COMMON SHARES


Pursuant to resolutions adopted at an extraordinary meeting of Pechiney's
shareholders on April 3, 2003 and an extraordinary meeting of the holders of
Pechiney's Preferred Shares "B" on May 27, 2003, the 1,091,040 outstanding
Pechiney Preferred Shares "B" were converted into Pechiney Common Shares
effective June 4, 2003, at the exchange ratio of 11 Common Shares for 10
Preferred Shares "B." In this conversion, each Pechiney Preferred Share "B" was
automatically converted into one Pechiney Common Share, with the holders of the
Pechiney Preferred Shares "B" also receiving one Pechiney Bonus Allocation Right
per Pechiney Preferred Share "B." Each Pechiney Bonus Allocation Right gives the
holder the right to acquire 0.10 of a Pechiney Common Share, with 10 Pechiney
Bonus Allocation Rights being required to acquire one Pechiney Common Share. No
fractional Pechiney Common Shares will be issued in exchange for Pechiney Bonus
Allocation Rights. The Bonus Allocation Rights, whose ISIN code is FR0000951634,
were listed on Euronext Paris through August 4, 2003, and from that date
continue to trade over-the-counter. Under French law, the Pechiney Bonus
Allocation Rights may be bought and sold, and remain exercisable in round lots
of 10 by their holders, for a period of two years from the date of the
publication of a notice in France regarding the two-year period of exercise.
That notice was published on June 4, 2003. At the expiry of this two-year
period, any underlying Pechiney Common Shares that have not been exchanged for
Pechiney Bonus Allocation Rights will be sold on the market. In connection with
the conversion of the Pechiney Preferred Shares "B," the "A" designation
formerly assigned to the Pechiney Common Shares was eliminated.


                                        84


         PRO FORMA COMBINED FINANCIAL STATEMENTS OF ALCAN AND PECHINEY

The following unaudited pro forma combined balance sheet and unaudited pro forma
combined statement of income, which give effect to the offers, are presented in
U.S. dollars and reflect the combination of Alcan and Pechiney using the
purchase method under U.S. GAAP. The pro forma adjustments are based upon
available information and certain assumptions that pursuant to the offers:

     - all of the outstanding Pechiney Common Shares are exchanged for Alcan
       Common Shares and cash. 3 Alcan Common Shares and E123 in cash are
       exchanged for every 5 Pechiney Common Shares;


     - all of the outstanding Pechiney Bonus Allocation Rights are exchanged for
       Alcan Common Shares and cash. 3 Alcan Common Shares and E123 in cash are
       exchanged for every 50 Pechiney Bonus Allocation Rights (assumed to have
       been satisfied by the issuance of Pechiney Common Shares during the
       three-month period ended June 30, 2003);


     - all of the outstanding Pechiney OCEANEs are exchanged for cash. Each
       Pechiney OCEANE is exchanged for E81.70;

     - all of the outstanding Pechiney ADSs are exchanged for Alcan Common
       Shares and cash. 3 Alcan Common Shares and E123 in cash are exchanged for
       every 10 Pechiney ADSs;

     - all of the outstanding Pechiney stock options are exchanged for Alcan
       stock options; and

     - the cash consideration paid in the offers is financed by additional Alcan
       debt.


The unaudited pro forma combined balance sheet and unaudited pro forma combined
statement of income are presented for illustrative purposes only and are not
necessarily indicative of the operating results or financial condition of the
combined entities that would have been achieved if the offers had been completed
during the periods presented, nor are the unaudited pro forma combined balance
sheet and unaudited pro forma combined statement of income necessarily
indicative of the future operating results or financial position of the combined
entities. The unaudited pro forma combined balance sheet and unaudited pro forma
combined statement of income do not reflect any cost savings or other synergies
which may result from the combination. The unaudited pro forma financial
information does not reflect any special items such as payments pursuant to
change of control provisions or restructuring and integration costs which may be
incurred as a result of the acquisition. In addition, the financial effects of
any actions described in the section "The Offers -- Reasons for the
Offers -- Employment Matters," such as costs of rationalization or synergies,
cannot currently be determined and are therefore not reflected in the unaudited
pro forma combined financial statements. Because Alcan has access only to
publicly available financial information about Pechiney's accounting policies,
there can be no assurance that the accounting policies of Pechiney conform to
those of Alcan.



In order to obtain regulatory approval, Alcan may be required to divest certain
businesses, operations or assets. Alcan has offered commitments to the European
Commission to divest certain businesses of Alcan and/or Pechiney in order to
obtain the approval of the European Commission. Because these commitments have
not yet been accepted by the European Commission, they have not been reflected
in the unaudited pro forma combined financial statements. Alcan anticipates that
the businesses that it is likely to be required to divest to comply with
conditions imposed by a regulatory authority will represent approximately 4% to
5% of total unaudited pro forma combined revenues. See "The Offers -- Reasons
for the Offers -- Commitments Offered to the European Commission to Obtain
Regulatory Approval."



The unaudited pro forma combined balance sheet and unaudited pro forma combined
statement of income have been derived from and should be read in conjunction
with the respective consolidated financial information of Alcan and Pechiney as
of and for the six months ended June 30, 2003, and as of and for the year ended
December 31, 2002, which are incorporated herein by reference. All amounts are
stated in U.S. dollars. This pro forma information is subject to risks and
uncertainties, including those discussed under "Risk Factors -- Risks Relating
to the Offers -- We Have Not Been Given the Opportunity to Conduct a Due
Diligence Review of the Non-Public Records of Pechiney. Therefore, We May Be
Subject to Unknown Liabilities of Pechiney Which May Have a Material Adverse
Effect on Our Profitability and Results of Operations" and "Risk
Factors -- Risks Relating to the Offers -- We Have Not Verified the Reliability
of the

                                        85



Pechiney Information Included in, or Incorporated by Reference into, this
Prospectus and as a Result, Our Estimates of the Benefits of Consummation of the
Offers on the Pro Forma Information in this Prospectus May be Incorrect."


As noted above, Alcan prepares its financial statements in accordance with
Canadian GAAP, and provides a reconciliation of such financial statements to
U.S. GAAP. Since Pechiney does not prepare Canadian GAAP financial information,
but does prepare a U.S. GAAP reconciliation of its financial statements, the pro
forma financial information herein is prepared in accordance with U.S. GAAP.

                                        86


                        ALCAN AND PECHINEY -- U.S. GAAP


         UNAUDITED PRO FORMA COMBINED BALANCE SHEET AS OF JUNE 30, 2003




                                                                                    FRENCH
                                                                                     GAAP
                                           CANADIAN                               TRANSLATED
                                             GAAP       ALCAN US                  HISTORICAL
                                          HISTORICAL      GAAP       ALCAN US      PECHINEY
                                            ALCAN      ADJUSTMENTS     GAAP     (RECLASSIFIED)
                                          ----------   -----------   --------   --------------
                                          (IN MILLIONS OF US DOLLARS EXCEPT PER SHARE AMOUNTS)
                                                                    
                                            ASSETS
CURRENT ASSETS
Cash and time deposits..................       127          (10)         117          339
Marketable securities...................        --           --           --           62
Receivables.............................     1,982           14        1,996        1,703
Inventories.............................     2,220         (101)       2,119        1,656
Deferred income taxes...................        --           --           --           52
Current assets held for sale............        83           --           83           --
                                            ------        -----       ------        -----
                                             4,412          (97)       4,315        3,812
Deferred charges and other assets.......       665          962        1,627          779
Property, plant and equipment - net.....    10,452         (938)       9,514        3,338
Other intangible assets - net...........       319          122          441          154
Goodwill................................     2,353         (200)       2,153          713
Excess of purchase price over book value
  of net assets acquired................        --           --           --           --
Deferred income taxes...................        --           --           --          564
Long term assets held for sale..........        72           --           72           --
                                            ------        -----       ------        -----
Total assets............................    18,273         (151)      18,122        9,360
                                            ======        =====       ======        =====
                                                  LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Payables................................     2,509          (75)       2,434        2,228
Short-term borrowings...................       348          (25)         323          424
Debt maturing within one year...........       235          (48)         187          211
Current liabilities of operations held
  for sale..............................        41           --           41           --
                                            ------        -----       ------        -----
                                             3,133         (148)       2,985        2,863
Debt not maturing within one year.......     3,517          (63)       3,454        1,514
Deferred credits and other
  liabilities...........................     1,631          672        2,303        1,325
Deferred income taxes...................     1,198         (253)         945          210
Minority interests......................       195           --          195          168
Long term liabilities of operations held
  for sale..............................         8           --            8           --
SHAREHOLDERS' EQUITY
Preference shares.......................       160           --          160           --
Common shareholders' equity Common
  shares................................     4,711           --        4,711        2,131
  Retained earnings.....................     3,279           (6)       3,273        1,416
  Other.................................       441         (353)          88         (267)
                                            ------        -----       ------        -----
                                             8,591         (359)       8,232        3,280
                                            ------        -----       ------        -----
Total liabilities and shareholders'
  equity................................    18,273         (151)      18,122        9,360
                                            ======        =====       ======        =====



                                          PECHINEY US
                                             GAAP       PECHINEY US    PRO FORMA          PRO FORMA
                                          ADJUSTMENTS      GAAP       ADJUSTMENTS         COMBINED
                                          -----------   -----------   -----------         ---------
                                          (IN MILLIONS OF US DOLLARS EXCEPT PER SHARE AMOUNTS)
                                                                              
                                                                   ASSETS
CURRENT ASSETS
Cash and time deposits..................       --            339              --              456
Marketable securities...................       --             62              --               62
Receivables.............................      276          1,979              --            3,975
Inventories.............................        2          1,658              --            3,777
Deferred income taxes...................      (17)            35              --               35
Current assets held for sale............       --             --              --               83
                                              ---          -----       ---------           ------
                                              261          4,073                            8,388
Deferred charges and other assets.......      (64)           715              --            2,342
Property, plant and equipment - net.....       (1)         3,337              --           12,851
Other intangible assets - net...........       --            154              --              595
Goodwill................................       39            752            (752)(b)        2,153
Excess of purchase price over book value
  of net assets acquired................       --             --           1,467(b)         1,467
Deferred income taxes...................       (8)           556              --              556
Long term assets held for sale..........       --             --              --               72
                                              ---          -----       ---------           ------
Total assets............................      227          9,587             715           28,424
                                              ===          =====       =========           ======
                                                    LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
Payables................................      230          2,458              --            4,892
Short-term borrowings...................       --            424           2,876(a)         3,623
Debt maturing within one year...........       --            211              --              398
Current liabilities of operations held
  for sale..............................       --             --              --               41
                                              ---          -----       ---------           ------
                                              230          3,093           2,876            8,954
Debt not maturing within one year.......       --          1,514            (663)(b)        4,305
Deferred credits and other
  liabilities...........................       62          1,387              --            3,690
Deferred income taxes...................       --            210             (25)(b)        1,130
Minority interests......................       --            168              --              363
Long term liabilities of operations held
  for sale..............................       --             --              --                8
SHAREHOLDERS' EQUITY
Preference shares.......................       --             --              --              160
Common shareholders' equity Common
  shares................................       --          2,131            (450)(b)        6,392
  Retained earnings.....................       26          1,442          (1,442)(b)        3,273
  Other.................................      (91)          (358)            419(b)           149
                                              ---          -----       ---------           ------
                                              (65)         3,215          (1,473)           9,974
                                              ---          -----       ---------           ------
Total liabilities and shareholders'
  equity................................      227          9,587             715           28,424
                                              ===          =====       =========           ======



The accompanying notes are an integral part of the unaudited pro forma combined
                              financial statements

                      See Note 6 for sensitivity analyses.
                                        87


                        ALCAN AND PECHINEY -- U.S. GAAP

  UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME FROM CONTINUING OPERATIONS

BEFORE NONRECURRING CHARGES OR CREDITS DIRECTLY ATTRIBUTABLE TO THE ACQUISITION


                 FOR THE SIX MONTH PERIOD ENDED JUNE 30, 2003.




                                                                        FRENCH
                                                                         GAAP
                           CANADIAN                                   TRANSLATED
                             GAAP        ALCAN US                     HISTORICAL
                          HISTORICAL       GAAP        ALCAN US        PECHINEY
                             ALCAN      ADJUSTMENTS      GAAP       (RECLASSIFIED)
                          -----------   -----------   -----------   --------------
                            (IN MILLIONS OF US DOLLARS EXCEPT PER SHARE AMOUNTS)
                                                        
REVENUES
Sales and operating
  revenues..............        6,681       (15)            6,666       6,135
COSTS AND EXPENSES
Cost of sales and
  operating expenses....        5,286        43             5,329       5,391
Depreciation............          455       (37)              418         213
Goodwill amortization...           --        --                --          16
Selling, administrative
  and general
  expenses..............          339        (1)              338         324
Research and development
  expenses..............           61        --                61          53
Interest................          104        (2)              102          51
Restructuring,
  impairment and other
  special charges.......          (14)       (6)              (20)         67
Other expenses
  (income)..............          109        22               131          (7)
                          -----------       ---       -----------       -----
                                6,340        19             6,359       6,108
Income (loss) before
  income taxes and other
  items.................          341       (34)              307          27
Income taxes............          292       (15)              277          17
                          -----------       ---       -----------       -----
                                   49       (19)               30          10
Equity income...........            1        18                19           6
Minority interests......          (13)       --               (13)         (3)
                          -----------       ---       -----------       -----
Income (loss) from
  continuing operations
  before nonrecurring
  charges or credits
  directly attributable
  to the acquisition....           37        (1)               36          13
Dividends on preference
  shares................            3        --                 3          --
                          -----------       ---       -----------       -----
Income (loss) from
  continuing operations
  before nonrecurring
  charges or credits
  directly attributable
  to the acquisition
  attributable to common
  shareholders..........           34        (1)               33          13
                          -----------       ---       -----------       -----
Income from continuing
  operations before
  nonrecurring charges
  or credits directly
  attributable to the
  acquisition per common
  share
  Basic.................         0.10                        0.10
  Diluted...............         0.10                        0.10
Weighted average of
  common shares
  outstanding
  Basic.................  321,609,871                 321,609,871
  Diluted...............  321,873,812                 321,873,812



                           PECHINEY
                            US GAAP     PECHINEY US    PRO FORMA     PRO FORMA
                          ADJUSTMENTS      GAAP       ADJUSTMENTS    COMBINED
                          -----------   -----------   -----------   -----------
                          (IN MILLIONS OF US DOLLARS EXCEPT PER SHARE AMOUNTS)
                                                        
REVENUES
Sales and operating
  revenues..............        1          6,136            --           12,802
COSTS AND EXPENSES
Cost of sales and
  operating expenses....        7          5,398            --           10,727
Depreciation............      (11)           202            --              620
Goodwill amortization...      (16)            --            --               --
Selling, administrative
  and general
  expenses..............       --            324            --              662
Research and development
  expenses..............       --             53            --              114
Interest................       (2)            49             7(c)           158
Restructuring,
  impairment and other
  special charges.......       --             67            --               47
Other expenses
  (income)..............        4             (3)           --              128
                              ---          -----        ------      -----------
                              (18)         6,090             7           12,456
Income (loss) before
  income taxes and other
  items.................       19             46            (7)             346
Income taxes............        1             18            (3)(d)          292
                              ---          -----        ------      -----------
                               18             28            (4)              54
Equity income...........        2              8            --               27
Minority interests......       --             (3)           --              (16)
                              ---          -----        ------      -----------
Income (loss) from
  continuing operations
  before nonrecurring
  charges or credits
  directly attributable
  to the acquisition....       20             33            (4)              65
Dividends on preference
  shares................       --             --            --                3
                              ---          -----        ------      -----------
Income (loss) from
  continuing operations
  before nonrecurring
  charges or credits
  directly attributable
  to the acquisition
  attributable to common
  shareholders..........       20             33            (4)              62
                              ---          -----        ------      -----------
Income from continuing
  operations before
  nonrecurring charges
  or credits directly
  attributable to the
  acquisition per common
  share
  Basic.................                      --                           0.17
  Diluted...............                      --                           0.17
Weighted average of
  common shares
  outstanding
  Basic.................                                            368,387,931
  Diluted...............                                            368,802,867



The accompanying notes are an integral part of the unaudited pro forma combined
                              financial statements

This pro forma combined statement of income does not include any amortization of
  the excess purchase price, which may be material. See Note 6 for sensitivity
                                    analyses
                                        88


                        ALCAN AND PECHINEY -- U.S. GAAP

  UNAUDITED PRO FORMA COMBINED STATEMENT OF INCOME FROM CONTINUING OPERATIONS

BEFORE NONRECURRING CHARGES OR CREDITS DIRECTLY ATTRIBUTABLE TO THE ACQUISITION

                      FOR THE YEAR ENDED DECEMBER 31, 2002



                                                                         FRENCH
                                                                          GAAP
                            CANADIAN                                   TRANSLATED
                              GAAP        ALCAN US                     HISTORICAL
                           HISTORICAL       GAAP        ALCAN US        PECHINEY
                              ALCAN      ADJUSTMENTS      GAAP       (RECLASSIFIED)
                           -----------   -----------   -----------   --------------
                             (IN MILLIONS OF US DOLLARS EXCEPT PER SHARE AMOUNTS)
                                                         
REVENUES
  Sales and operating
    revenues.............       12,328       (28)           12,300       11,395
COSTS AND EXPENSES
  Cost of sales and
    operating expenses...        9,748        75             9,823       10,032
  Depreciation...........          836       (70)              766          317
  Goodwill
    amortization.........           --                          --           29
  Goodwill impairment....                                                    93
  Selling, administrative
    and general
    expenses.............          574        (1)              573          577
  Research and
    development
    expenses.............          115                         115           85
    Interest.............          202        (4)              198           79
Restructuring, impairment
  and other special
  charges................           69                          69          137
Other expenses
  (income)...............          113         2               115           60
                           -----------       ---       -----------       ------
                                11,657         2            11,659       11,409
Income (loss) before
  income taxes and other
  items..................          671       (30)              641          (14)
Income taxes.............          295       (17)              278           37
                           -----------       ---       -----------       ------
                                   376       (13)              363          (51)
Equity income............            3        51                54            3
Minority interests.......           (3)                         (3)          --
                           -----------       ---       -----------       ------
Income (loss) from
  continuing operations
  before nonrecurring
  charges or credits
  directly attributable
  to the acquisition.....          376        38               414          (48)
Dividends on preference
  shares.................            5                           5            2
                           -----------       ---       -----------       ------
Income (loss) from
  continuing operations
  before nonrecurring
  charges or credits
  directly attributable
  to the acquisition
  attributable to common
  shareholders...........          371        38               409          (50)
                           ===========       ===       ===========       ======
Income from continuing
  operations before
  nonrecurring charges or
  credits directly
  attributable to the
  acquisition per common
  shares
  Basic..................         1.15                        1.26
  Diluted................         1.14                        1.26
Weighted average of
  common shares
  outstanding
  Basic..................  321,208,914                 321,208,914
  Diluted................  322,423,183                 322,423,183



                            PECHINEY
                             US GAAP     PECHINEY US    PRO FORMA     PRO FORMA
                           ADJUSTMENTS      GAAP       ADJUSTMENTS    COMBINED
                           -----------   -----------   -----------   -----------
                           (IN MILLIONS OF US DOLLARS EXCEPT PER SHARE AMOUNTS)
                                                         
REVENUES
  Sales and operating
    revenues.............        9         11,404                         23,704
COSTS AND EXPENSES
  Cost of sales and
    operating expenses...       (6)        10,026                         19,849
  Depreciation...........       --            317                          1,083
  Goodwill
    amortization.........      (29)            --                             --
  Goodwill impairment....      (20)            73                             73
  Selling, administrative
    and general
    expenses.............       --            577                          1,150
  Research and
    development
    expenses.............       --             85                            200
    Interest.............        1             80            19(e)           297
Restructuring, impairment
  and other special
  charges................       --            137                            206
Other expenses
  (income)...............       --             60                            175
                               ---         ------        ------      -----------
                               (54)        11,355            19           23,033
Income (loss) before
  income taxes and other
  items..................       63             49           (19)             671
Income taxes.............        5             42            (8)(f)          312
                               ---         ------        ------      -----------
                                58              7           (11)             359
Equity income............       14             17                             71
Minority interests.......       --             --                             (3)
                               ---         ------        ------      -----------
Income (loss) from
  continuing operations
  before nonrecurring
  charges or credits
  directly attributable
  to the acquisition.....       72             24           (11)             427
Dividends on preference
  shares.................                       2                              7
                               ---         ------        ------      -----------
Income (loss) from
  continuing operations
  before nonrecurring
  charges or credits
  directly attributable
  to the acquisition
  attributable to common
  shareholders...........       72             22           (11)             420
                               ===         ======        ======      ===========
Income from continuing
  operations before
  nonrecurring charges or
  credits directly
  attributable to the
  acquisition per common
  shares
  Basic..................                                                   1.14
  Diluted................                                                   1.14
Weighted average of
  common shares
  outstanding
  Basic..................                                            367,922,357
  Diluted................                                            369,352,238



The accompanying notes are an integral part of the unaudited pro forma combined
                              financial statements

This pro forma combined statement of income does not include any amortization of
  the excess purchase price, which may be material. See Note 6 for sensitivity
                                    analyses

                                        89


                        ALCAN AND PECHINEY -- U.S. GAAP

    NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS -- U.S. GAAP
             (IN MILLIONS OF U.S. DOLLARS EXCEPT PER SHARE AMOUNTS)

1.  BASIS OF PRESENTATION

These unaudited pro forma combined financial statements have been prepared to
reflect the combination of Alcan and Pechiney using the purchase method.

Because Alcan has access only to publicly available financial information about
Pechiney's accounting policies, there can be no assurance that the accounting
policies of Pechiney conform to those of Alcan.


The unaudited pro forma combined financial statements are based on the following
assumptions related to the combination:



     - all of the outstanding Pechiney Common Shares (including Pechiney Common
       Shares underlying the Pechiney ADSs and excluding those held by Pechiney
       and one of its subsidiaries) are tendered for exchange for a combination
       of Alcan Common Shares and cash;



     - Pechiney Common Shares were issued during the three-month period ended
       June 30, 2003 in satisfaction of the Pechiney Bonus Allocation Rights;



     - all of the outstanding Pechiney OCEANEs are tendered for exchange for
       cash, including a premium of $39 million over book value;


     - all of the outstanding Pechiney's stock options are replaced by Alcan
       stock options based on the exchange ratio and at a strike price equal to
       the market value of an underlying Alcan Common Share and no Pechiney
       stock options are exercised in connection with the combination;

     - the cash consideration for the offers is financed by additional Alcan
       debt; and


     - for purposes of calculating the purchase price, an exchange rate of
       $1.0871 for E1.00 has been used.



The combination will be accounted for as a "purchase" in accordance with U.S.
GAAP with Alcan being identified as the acquirer. Under this approach, the fair
value of Alcan Common Shares to be issued for Pechiney securities will be based
on the market value of Alcan Common Shares when sufficient shares have been
tendered to make the offer binding on Alcan or when Alcan and Pechiney enter
into a purchase agreement. For the purpose of these unaudited pro forma combined
statements, an assumed fair value of $35.99 per Alcan Common Share has been used
based on the average of the closing price for the Alcan Common Shares on the New
York Stock Exchange for the six trading days beginning on August 18, 2003 and
ending on August 25, 2003. This estimate of value is preliminary and material
changes may occur before the conditions for establishing the accounting value
are met.



The unaudited pro forma combined balance sheet is presented as if the
combination between Alcan and Pechiney had been effective June 30, 2003 while
the unaudited pro forma combined statements of income are presented as if the
combination between Alcan and Pechiney had been effective January 1, 2002.


The purchase price will be allocated to the Pechiney assets acquired and
liabilities assumed based on their estimated fair market value.

                                        90

         NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS --
                            U.S. GAAP -- (CONTINUED)

For the purpose of the unaudited pro forma combined financial statements, no
purchase price allocation has been performed since Alcan has limited information
about Pechiney.



                                                           
Number of Pechiney securities outstanding(1)................   77,855,739
Alcan Common share per Pechiney security....................          0.6
                                                              -----------
Alcan Common Shares to be issued............................   46,713,443
                                                              ===========
Price per Alcan Common Share................................        35.99
                                                              ===========
Consideration payable in Alcan Common Shares (in
  millions).................................................  $     1,681
Cash consideration for (in millions):
  Pechiney Common Shares....................................        2,082
  Pechiney OCEANEs (7,908,636 bonds)........................          702
Transactions costs (net of tax of $25)(in millions).........           67
Assumed fair value of Alcan stock options issued to replace
  Pechiney stock options (in millions)(2)...................           61
                                                              -----------
Total purchase price (in millions)..........................  $     4,593
                                                              -----------
Less (in millions):
     Book value of Pechiney shareholders' equity (excluding
      Pechiney's goodwill of $752)..........................        2,463
     Book value of Pechiney OCEANEs.........................          663
                                                              -----------
Excess of purchase price over book value of shareholders'
  equity and Pechiney OCEANEs (in millions).................  $     1,467
                                                              -----------



---------------


(1) Excluding 4,767,044 Pechiney Common Shares held by Pechiney and one of its
    subsidiaries.



(2) Includes 3,484,950 Pechiney stock options assumed to be outstanding as at
    June 30, 2003.


The pro forma information is based on preliminary estimates and assumptions set
forth below in note 5. These adjustments and allocation of purchase price are
preliminary. Due to the limited financial and other information available to
Alcan's management, the excess of the purchase price over the book value of the
assets to be acquired has been allocated to "Excess of purchase price over net
assets acquired". The final purchase price allocation will be completed after
asset and liability valuations are finalized by Alcan's management. A final
determination of these fair values, which cannot be made prior to the completion
of the combination, will include Alcan's management's consideration of all
pertinent factors. This final valuation will be based on the actual net tangible
and intangible assets of Pechiney that exist as of the date of the completion of
the combination. Any final adjustments may change the allocation of purchase
price which could affect the fair value assigned to the assets and liabilities
and could result in material changes to the unaudited pro forma combined
financial statements. Amount preliminarily allocated to "Excess of purchase
price over book value of net assets acquired" will be allocated to various
classes of assets, including intangible assets with indefinite lives, intangible
assets with definite lives and goodwill. These final allocations may result in a
material increase in amortization of assets. In addition, the impact of ongoing
integration activities, the timing of the completion of the combination and
other changes in Pechiney's net tangible and intangible assets prior to the
completion of the combination could cause material differences in the
information presented.


The accompanying unaudited pro forma combined financial statements are based on
and should be read in conjunction with the historical consolidated financial
statements of Alcan and Pechiney for the year ended December 31, 2002 and for
the six-month period ended June 30, 2003, including the notes thereto which are
incorporated by reference in this document. Certain reclassifications have been
made to the Pechiney historical financial statements to conform to the expected
presentation to be used by Alcan upon completion of the combination and based on
certain assumptions made by Alcan.


                                        91

         NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS --
                            U.S. GAAP -- (CONTINUED)

The pro forma adjustments are based upon available information and include
certain assumptions and adjustments, which the management of Alcan believes to
be reasonable. However, Alcan's adjustments and assumptions do not reflect any
input from Pechiney, as discussed above. These adjustments are directly
attributable to the combination and are expected to have a continuing impact on
Alcan's business, results of operations and financial position. The pro forma
information does not reflect cost savings expected to be realized from the
elimination of certain expenses and from the synergies to be created to the
costs to implement such cost savings or synergies. No assurance can be given
that operating cost savings and synergies will be realized. The pro forma
financial information does not reflect any special items such as payments
pursuant to change of control provisions or restructuring and integration costs
which may be incurred as a result of the acquisition.


To compute the pro forma $61 included in the purchase price relating to the
assumed fair value of Alcan stock options issued to replace Pechiney stock
options, Alcan used a Black-Scholes valuation model based on the
weighted-average assumptions used to compute the pro forma compensation expense
as reported in Alcan's historical consolidated financial statements. The
principal assumptions used are: dividend yield of 1.65%; expected volatility of
35.73%; risk-free interest rate of 3.5% and expected life of 6 years. Alcan
management has not yet determined how these options would be treated and,
accordingly, the value and the accounting for any treatment of the Pechiney
options may differ from those presented. Should Alcan purchase the Pechiney
stock options instead of converting them into Alcan stock options, unaudited pro
forma combined Short-term borrowings would increase by $61 million and Other
equity would decrease by $61 million. Pro forma interest expense for the year
ended December 31, 2002 and for the six month period ended June 30, 2002 would
increase by $1 million and Pro forma combined income from continuing operations
before nonrecurring charges or credits directly attributable to the acquisition
would decrease by $1 million ($0.00 per common share).


The unaudited pro forma combined financial statements are not necessarily
indicative either of the results that actually would have been achieved if the
transactions reflected therein had been effective during the periods presented
or of the results which may be obtained in the future.

2.  FOREIGN CURRENCY TRANSLATION


The Pechiney historical balance sheet information and related pro forma
adjustments as of June 30, 2003 have been translated into U.S. dollars at the
June 30, 2003 rate of exchange of U.S. $1 = 0.8772 euros. The Pechiney
historical statements of income information for the year ended December 31,
2002, the six-month period ended June 30, 2003 and related pro forma adjustments
to the unaudited pro forma statements of income have been translated at the
average rates of exchange of U.S. $1 = 0.9454 euros and U.S. $1 = 0.9009 euros,
respectively.


3.  DIFFERENCES BETWEEN CANADIAN AND U.S. GAAP AS THEY APPLY TO ALCAN

Refer to Note 7 of the Alcan consolidated financial statements which are
incorporated by reference into this prospectus for a description of the
differences between Canadian and U.S. GAAP as they apply to Alcan. However,
investments in joint ventures have been accounted for using the equity method in
these pro forma combined financial statements. In Alcan's consolidated financial
statements incorporated by reference into this document, joint ventures are
accounted for using the proportionate consolidation method.

4.  DIFFERENCES BETWEEN FRENCH GAAP AND U.S. GAAP AS THEY APPLY TO PECHINEY

Refer to Note 25 of the Pechiney financial statements which are incorporated by
reference into this prospectus for a description of the difference between
French and U.S. GAAP as they apply to Pechiney.

                                        92

         NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS --
                            U.S. GAAP -- (CONTINUED)

5.  UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS

The unaudited pro forma combined financial statements incorporate the following
adjustments:


The following adjustments have been made to prepare the pro forma balance sheet
and statement of income. Pro forma statement of income adjustments are assumed
to occur as of January 1, 2002. Pro forma balance sheet adjustments are assumed
to occur at June 30, 2003.




                                                             
UNAUDITED COMBINED PRO FORMA
BALANCE SHEET AS AT JUNE 30, 2003 (IN MILLIONS OF U.S. DOLLARS)
a)   Borrowing under new credit facility to finance acquisition
     of Pechiney securities






                                             
     Debit    Cash.........................   2,876






                                                             
               Credit    Short-term borrowings...................   2,876






                                                             
     Reflecting consideration for Pechiney Common Shares, Pechiney
b)   OCEANEs, Pechiney ADSs and Pechiney stock options and transaction
     costs of $92 by issuance of Alcan Common Shares with an estimated
     value of $35.99, issuance of Alcan replacement options with an
     estimated value of $61 and cash of $2,876. Reflecting deferred
     income taxes of $25 related to transaction costs and allocation of
     the purchase price by elimination of Pechiney's goodwill; the
     elimination of Pechiney's shareholders' equity accounts, and the
     allocation of the remainder to excess of purchase price over book
     value of net assets acquired (see note 6 for sensitivities)






                                                         
     Debit    Excess of purchase price over book value
              of net assets acquired...................   1,467
              Debt not maturing within one year........     663
              Deferred income taxes....................      25
              Pechiney Common Shares...................   2,131
              Retained earnings........................   1,442






                                                             
               Credit    Pechiney goodwill.......................     752
                         Cash....................................   2,876
                         Other equity............................     358
                         Alcan Common Shares.....................   1,681
                         Alcan stock options.....................      61
UNAUDITED COMBINED PRO FORMA
  INCOME STATEMENT FOR THE SIX MONTHS ENDED JUNE 30, 2003
  (IN MILLIONS OF U.S. DOLLARS)
c)   Interest expense on debt issued to finance acquisition and
     retirement of Pechiney OCEANEs at an assumed annual interest
     rate of 1.6%................................................      23
     Elimination of interest on Pechiney OCEANEs.................     (10)
     Elimination of amortization of Pechiney OCEANEs premium.....      (6)
                                                                   ------
                                                                        7
                                                                   ======
d)   Income tax recovery on line item (c) at 36% for Alcan and
     34% for Pechiney............................................      (3)
                                                                   ======



                                        93

         NOTES TO UNAUDITED PRO FORMA COMBINED FINANCIAL STATEMENTS --
                            U.S. GAAP -- (CONTINUED)


                                                             
UNAUDITED COMBINED PRO FORMA
INCOME STATEMENT FOR THE YEAR ENDED DECEMBER 31, 2002
(IN MILLIONS OF U.S. DOLLARS)
e)   Interest expense on debt issued to finance acquisition and
     retirement of Pechiney OCEANEs at an assumed annual interest
     rate of 1.6%................................................      49
     Elimination of interest on Pechiney OCEANEs.................     (19)
     Elimination of amortization of Pechiney OCEANEs premium.....     (11)
                                                                   ------
                                                                       19
                                                                   ======
f)   Income tax recovery on line item (e) at 36% for Alcan and
     34% for Pechiney............................................      (8)
                                                                   ======




The 1.6% assumed annual interest rate on debt issued to finance the acquisition
and retirement of the Pechiney OCEANEs was determined based on the current
3-month LIBOR rate plus a margin of 0.5%, pursuant to the bridge credit facility
that Alcan expects to enter into in connection with the transaction. See "The
Offers -- Reasons for the Offers -- Source and Amount of Funds."


6.  SENSITIVITY ANALYSIS


The unaudited pro forma combined financial statements are based upon the
assumption that 100% of the Pechiney Common Shares (including Pechiney Common
Shares underlying the Pechiney ADSs and excluding the Pechiney Common Shares
held by Pechiney and one of its subsidiaries) are exchanged for Alcan Common
Shares and cash in the offers. For each 10% decrease in the number of Pechiney
Common Shares exchanged, pro forma common shareholders' equity as of June 30,
2003 will decrease by $168 and Short-term borrowings will decrease by $208
million. However, pro forma combined income from continuing operations before
nonrecurring charges or credits directly attributable to the acquisition would
be unchanged for the year ended December 31, 2002 and the six month period ended
June 30, 2003.



The unaudited pro forma combined financial statements are based upon the
assumption that the purchase price is $4,593. For every $100 increase (decrease)
in the purchase price, pro forma common shareholders equity as of June 30, 2003
will increase (decrease) by $40 and pro forma net income for the year ended
December 31, 2002 will decrease (increase) by $1 or $0.00 per common share, due
to changes in interest expense and related income taxes.



For every $100 of the "Excess of Purchase Price over book value of net assets
acquired" which is allocated to tangible and identifiable assets with definite
lives, pro forma combined annual net income from continuing operations before
nonrecurring charges or credits directly attributable to the acquisition would
decrease by $3 or $0.01 per common share, assuming an amortization period of 20
years, estimated to be their average remaining useful life.



For each 125 basis points increase (decrease) in the interest rate on short-term
borrowings assumed to finance the acquisition, pro forma combined annual net
income from continuing operations before nonrecurring charges or credits
directly attributable to the acquisition would decrease (increase) by $2, or
$0.01 per common share.



The unaudited pro forma combined financial statements are based upon the
assumption that 100% of the Pechiney OCEANEs are exchanged in the offers. For
every $100 million amount of Pechiney OCEANEs that are not exchanged, Pro forma
combined income from continuing operations before nonrecurring charges or
credits directly attributable to the acquisition would decrease by approximately
$2 million, or $0.01 per common share, being the impact of the higher interest
expense on the Pechiney OCEANEs compared to Alcan's incremental short term
borrowing rate.


                                        94


                               REGULATORY MATTERS

In order to complete these offers, Alcan must receive approval from the European
Commission, the competition authorities of Member States of the European Union
(to the extent that jurisdiction to review all or a part of the transaction has
been referred to them by the European Commission) and the U.S. Federal Trade
Commission and Department of Justice. It is possible that one or more of these
bodies may fail to provide the requested approvals or may impose, as a condition
of approval, various conditions and/or obligations. Receipt of these regulatory
approvals is a condition to completion of these offers. There can be no
assurance that the required regulatory approvals and consents will be obtained
within the time frame contemplated by the offers or on terms that are
satisfactory to Alcan.


Other jurisdictions throughout the world claim jurisdiction under their
competition or antitrust laws in respect of acquisitions or mergers that have
the potential to affect their domestic marketplace. A number of these
jurisdictions have or will claim to have jurisdiction over the proposed
transaction. Although Alcan does not anticipate that there will be any
investigations or proceedings in any such jurisdiction that would have a
material impact on the completion of the offers or the operations of Alcan or
Pechiney, there can be no assurance that such investigations or proceedings,
whether by governmental authorities or private parties, will not be initiated
and, if initiated, will not have a material adverse impact on the completion of
the offers or the operations of Alcan or Pechiney.


Alcan is not aware of any material licenses or regulatory permits that it holds
which might be adversely affected by the completion of the offers for Pechiney
securities or of any material approval or other action by any federal,
provincial, state or foreign government or any administrative or regulatory
agency that would be required to be obtained prior to making the offers or
accepting securities pursuant thereto except as have been obtained or applied
for, or as described herein.

COMPETITION AND ANTITRUST

EUROPEAN UNION COMPETITION LAWS

Alcan and Pechiney both conduct business in the Member States of the European
Union. Council Regulation (EEC) No. 4064/89 (as amended) requires that certain
mergers or acquisitions involving parties with aggregate worldwide sales and
individual European Union sales exceeding certain thresholds be notified to and
approved by the European Commission before such mergers and acquisitions are
consummated. The aforementioned Regulation gives the Member States of the
European Union the right to request that the European Commission refer
jurisdiction to review a merger to their national competition authorities under
the provisions of the relevant national merger law where it may have an effect
on competition in a distinct national market. Such a request must be made within
three weeks of the transaction's notification to the European Commission.


Generally, the European Commission has one month from the date of the
notification of a transaction to adopt a decision either to approve the notified
transaction (whether unconditionally or subject to conditions and obligations)
or to open an in-depth investigation, lasting a maximum of a further four months
(which is sometimes referred to as a "Phase II review"). The initial one month
period is extended automatically to six weeks if (i) a Member State of the
European Union requests a referral of jurisdiction to review all or part of the
transaction for review by its competition authority, or (ii) within three weeks
of the notification of the transaction, the notifying party offers to commit to
the divestiture of overlapping assets or businesses or other conditions or
obligations to eliminate any aspects of the transaction that might cause the
European Commission to have serious doubts that the transaction raises
competition issues such that the transaction could be incompatible with the
common market. Alcan made its notification of the transaction to the European
Commission on August 14, 2003. On August 18, 2003, Alcan offered certain
commitments to the European Commission to resolve the competition issues that
may be raised by the transaction in relation to the European markets for certain
flat-rolled products, aluminum aerosol cans and aluminum cartridges. See "The
Offers -- Reasons for the Offers -- Commitments Offered to the European
Commission to Obtain Regulatory Approval" above. Accordingly, the European
Commission will have six weeks from notification of the transaction to adopt a
decision approving the transaction or to open a Phase II review, in which case
the offers


                                        95



would lapse. The last date upon which this decision may be adopted is September
29, 2003, unless the European Commission extends the deadline for one of a
limited number of reasons contained in the Regulation. Should the European
Commission open such a Phase II review, it would, at the end of a further period
of a maximum of four months, adopt a decision either approving the transaction
(whether unconditionally or subject to conditions and obligations) or declaring
the transaction incompatible with the common market, and therefore, prohibiting
the offers. In certain circumstances, the one month, six week and four month
periods can be extended if the European Commission requests information from
Alcan, which is not provided within the time period allowed: in such
circumstances, the Commission may adopt a procedure that can lead to the
suspension of the review timetable until all the requested information is
provided to it. A decision approving the transaction can be challenged before
the Court of First Instance of the European Communities by, among others,
Pechiney and competitors of Alcan or Pechiney. A decision to prohibit the
transaction can similarly be challenged by Alcan. Subject to review by the Court
of First Instance, once the European Commission has adopted a decision approving
the transaction, that decision can be revoked by it only if it subsequently
concludes that its approval of the transaction was granted on the basis of false
or misleading information furnished in the notification or otherwise furnished
by Alcan, or if Alcan has failed to comply with any conditions or obligations to
which the approval decision is subject.



UNITED STATES HART-SCOTT-RODINO ANTITRUST IMPROVEMENTS ACT OF 1976



Under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and
its associated rules, a share offer may not be completed until notification has
been filed with the Federal Trade Commission, or the "FTC," and the Antitrust
Division of the US Department of Justice, or the "DOJ," and the required waiting
period has expired or been terminated. The required waiting period may be
terminated by the FTC and the DOJ before its expiration. Expiration or
termination of this waiting period is a condition of the offers. If the FTC or
the DOJ believes that the share exchange would violate the federal antitrust law
by substantially lessening competition in any line of commerce affecting U.S.
consumers, the FTC and the DOJ have the authority to challenge the transaction
by seeking a federal court order enjoining the transaction. Other governmental
authorities, including state attorneys general, and private persons may seek to
enjoin the consummation of the share exchange under antitrust laws. The
expiration or termination of the waiting period does not bar the FTC or the DOJ
from challenging the share offer before or after its completion. There can be no
assurance that a challenge to the offers on antitrust grounds will not be made
or, if a challenge is made, that it would not be successful. In addition, state
antitrust authorities and private parties in certain circumstances may bring
legal action under the antitrust laws seeking to enjoin the offers or seeking
conditions to the completion of the merger. In order to facilitate review of the
offer, Alcan has engaged in preliminary discussions with the DOJ regarding the
DOJ's review of the transaction and Alcan is responding to requests for
information from the DOJ. Alcan expects to file the notification under the
Hart-Scott-Rodino Antitrust Improvements Act at the latest on a date that will
permit the waiting period to expire on or before September 29, 2003.


COMPETITION ACT (CANADA)


The proposed acquisition of the Pechiney securities is a notifiable transaction
under the Competition Act (Canada). Notifiable transactions cannot be completed
under the Competition Act (Canada) until a required notification is filed with
the Commissioner of Competition and the relevant waiting period has expired. A
long-form filing under the Competition Act (Canada) in respect of the proposed
transaction was made on July 30, 2003. The applicable waiting period will expire
on September 10, 2003, unless extended by the Commissioner of Competition.


The Commissioner of Competition has jurisdiction to challenge any transaction
that has the effect of lessening or preventing competition substantially in a
relevant market and such a challenge may be made any time before or within three
years after completion of the transaction. The expiration of the waiting period
referred to in the preceding paragraph does not bar the Commissioner of
Competition from bringing a proceeding. There can be no assurance that an
investigation or a proceeding by the Commissioner of Competition will not be
initiated and, if initiated, will not have a material adverse impact on the
operations of Alcan or Pechiney.

                                        96



SWISS FEDERAL COMPETITION COMMISSION



The transaction is required to be notified to the Swiss Federal Competition
Commission under the competition laws of Switzerland, as Switzerland is not a
member of the European Union or a party to the European Economic Area Agreement.
Generally, the Swiss Federal Competition Commission has one month following the
date of notification to decide whether to open an extended investigation of a
proposed acquisition. If no investigation is opened by the end of that waiting
period, the transaction may be completed. If the Commission opens an
investigation, the transaction may not close until the Commission renders its
final decision or grants a special authorization. Investigations must be
completed within a four month period. While Alcan does not anticipate that the
Swiss competition clearance process will delay or otherwise adversely affect the
transaction, there can be no assurance that the Swiss Federal Competition
Commission will not initiate an investigation and, if initiated, that it will
approve the transaction or that it will not make its approval subject to
conditions and obligations that would not adversely affect the operations of
Alcan or Pechiney. Alcan expects to file its notification with the Swiss Federal
Competition Commission at the beginning of September 2003.


OTHER JURISDICTIONS

Alcan and Pechiney have assets and sales in numerous jurisdictions throughout
the world other than the European Union, the United States, Canada and
Switzerland. Many of those jurisdictions have antitrust or competition laws that
could require that notifications be filed and clearances obtained prior to
completion of the proposed transaction. Other jurisdictions require filings
following completion of the transaction. Appropriate filings will be made in
those jurisdictions where it is determined that a filing is required.

The antitrust or competition laws of certain jurisdictions outside of the
European Union, the United States, Canada and Switzerland permit relevant
agencies to investigate and take proceedings in respect of transactions that are
perceived to have an effect on competition in the jurisdiction. Although Alcan
does not anticipate that there will be any investigations or proceedings that
would have a material impact on the completion of the offers or the operations
of Alcan or Pechiney, there can be no assurance that such investigations or
proceedings, whether by governmental authorities or private parties, will not be
initiated and, if initiated, will not have a material adverse impact on the
completion of the offers or the operations of Alcan or Pechiney.

INVESTMENT CONTROLS


Under French foreign investment control rules, the acquisition of any business
engaged in the defense sector is subject to the prior approval of the French
Minister of the Economy, Finance and Industry, who has a two-month period from
the date of notification to approve or prohibit the proposed acquisition.
Approval is deemed given in the event that the Minister does not respond to the
notification within that two-month period. As certain Pechiney subsidiaries are
currently engaged in the defense sector, a formal application in relation to the
offers for Pechiney securities was filed with the Minister by Alcan on July 7,
2003.


STOCK EXCHANGES


Alcan Common Shares are currently listed on the New York, Toronto, London and
Swiss stock exchanges. Alcan will apply to list its Alcan Common Shares on
Euronext Paris, subject to the successful completion of these offers, with a
view to the Euronext Paris listing being effective on the settlement date of
these offers. Alcan will also apply for the supplemental listing of the Alcan
Common Shares to be issued in these offers on the New York, Toronto, Paris,
London and Swiss stock exchanges, and will comply with all of the usual
requirements of such exchanges within the time periods specified by such
exchanges.


SECURITIES REGULATORY AUTHORITIES

The offers for Pechiney securities will be made in accordance with French law
and U.S. federal and state securities law. The Alcan Common Shares issued
pursuant to the offers for Pechiney securities to holders resident in the United
States and to holders of Pechiney ADSs will be registered with the SEC.

                                        97


The offers for Pechiney securities are not being made to holders of Pechiney
securities in jurisdictions outside of France or the United States where the
making or acceptance of such offer would not be in compliance with the laws of
such jurisdictions. However, Alcan may seek exemption orders or take such other
actions as it may deem necessary in order to extend the offers for Pechiney
securities to holders in such jurisdictions, including seeking exemptions from
the securities regulatory authorities in Canada to permit the offers for
Pechiney securities to be made to holders of Pechiney securities in Canada
without compliance with the take-over bid requirements otherwise applicable.

                                        98


                      DESCRIPTION OF ALCAN'S SHARE CAPITAL

                      OUTSTANDING SERIES OF SHARE CAPITAL




                                                              AUTHORIZED   OUTSTANDING*
                                                              ----------   ------------
                                                                     
Common Shares...............................................  Unlimited    321,764,766
Preference Shares, issuable in series, of which the
  following series are outstanding:.........................  Unlimited
  Floating Rate Cumulative Redeemable Preference Shares,
     Series C, 1984 Issue...................................  4,200,000      4,200,000
  Floating Rate Cumulative Redeemable Preference Shares,
     Series C, 1985 Issue...................................  1,500,000      1,500,000
  Cumulative Redeemable Preference Shares, Series E.........  3,000,000      3,000,000



---------------


* As at July 31, 2003.


                     DESCRIPTION OF ALCAN PREFERENCE SHARES

The authorized capital of Alcan includes an unlimited number of preference
shares, issuable in series. Alcan currently has three outstanding series of
preference shares, consisting of

     - Alcan Floating Rate Cumulative Redeemable Preference Shares, Series C,
       1984 Issue (the "Alcan Series C 1984");

     - Alcan Floating Rate Cumulative Redeemable Preference Shares, Series C,
       1985 Issue (the "Alcan Series C 1985," and together with the Alcan Series
       C 1984, the "Alcan Series C"); and

     - Alcan Cumulative Redeemable Preference Shares, Series E (the "Alcan
       Series E," and together with the Alcan Series C, the "Alcan Preference
       Shares").

Alcan may issue an unlimited number of preference shares of additional series
from time to time upon approval by the Alcan board of directors for such
consideration as the Alcan board of directors decides appropriate, without the
need of further shareholder authorization. However, the Alcan board of directors
is not allowed to create or issue any series of preference shares with voting
rights, other than voting rights arising only in the event of non-payment of
dividends, without the consent of Alcan's common shareholders, given by way of
special resolution. The terms of any preference shares, including dividend
rates, conversion and voting rights, if any, redemption prices and similar
matters will be determined by the Alcan board of directors prior to issuance.

The holders of each class of Alcan Preference Shares will be entitled to receive
cumulative cash dividends at the following rates:

     - Alcan Series C:  quarterly dividends in an amount determined by applying
       to CAN $25 per share 25% of the greater of (1) 72% of the average of the
       Canadian prime interest rates quoted by two major Canadian banks for
       stated periods, and (2) the lesser of 7.5% and the average of the
       Canadian prime interest rates quoted by two major Canadian banks for
       stated periods.

     - Alcan Series E:  quarterly dividends in an amount determined by applying
       to CAN $25 per share 25% of 75% of the average of the Canadian prime
       interest rates quoted by two major Canadian banks for stated periods.

The holders of Alcan Preference Shares are not entitled to vote at meetings of
Alcan shareholders unless Alcan fails to pay six quarterly dividends on such
Alcan Preference Shares. Thereafter, so long as such dividends remain in
arrears, the holders will be entitled, voting separately as a class, to elect
two members of the board of directors of Alcan.

The Alcan Preference Shares are fully paid and nonassessable.

                                        99


In the event that Alcan liquidates, dissolves or winds up or distributes its
assets among Alcan shareholders for the purpose of winding up its affairs, the
holders of the Alcan Preference Shares will be entitled to receive, in
preference to holders of the Alcan Common Shares, the sum of CAN $25 per Alcan
Preference Share plus all accrued and unpaid dividends. Additionally, if such
distribution is voluntary, an additional amount equal to the premium, if any,
will be payable on redemption.

The Alcan Preference Shares are redeemable at Alcan's option at CAN $25 per
Alcan Preference Share plus all accrued and unpaid dividends.

Unless all dividends then payable on the Alcan Preference Shares have been
declared and paid or set apart for payment, Alcan will not:

     - pay any dividends, other than stock dividends, or make any distributions
       on any shares ranking junior to the Alcan Preference Shares with respect
       to the payment of dividends or return of capital,

     - retire for value any shares ranking junior to the Alcan Preference Shares
       with respect to payment of dividends or return of capital, or

     - except in connection with the exercise of a retraction privilege, retire
       less than all of a series of the Alcan Preference Shares.

The Alcan Preference Shares are listed on the Toronto Stock Exchange.

                       DESCRIPTION OF ALCAN COMMON SHARES

Alcan Common Shares are subject to the rights of the holders of the Alcan
Preference Shares, as described above, and of any other preferred securities
issued in the future.

The holders of Alcan Common Shares are entitled to one vote per share at all
meetings of shareholders of Alcan, to participate ratably in any dividends which
may be declared on Alcan Common Shares by the board of directors of Alcan and,
in the event of liquidation, dissolution or winding-up or other distribution of
assets or property of Alcan, to a pro rata share of the assets of Alcan after
payment of all liabilities and obligations. The Alcan Common Shares have no
pre-emptive, redemption or conversion rights. All outstanding Alcan Common
Shares and all Alcan Common Shares to be issued under this prospectus will be
fully paid and nonassessable.

The provisions of the Canada Business Corporations Act require that the
amendment of certain rights of holders of any class of shares, including the
Alcan Common Shares, must be approved by not less than two-thirds of the votes
cast by the holders of such shares. A quorum for any meeting of the holders of
Alcan Common Shares is 40% of the Alcan Common Shares then outstanding.
Therefore, it is possible for the rights of the holders of Alcan Common Shares
to be changed other than by the affirmative vote of the holders of the majority
of the outstanding Alcan Common Shares. In circumstances where certain rights of
holders of Alcan Common Shares may be amended, however, holders of Alcan Common
Shares will have the right, under the Canada Business Corporations Act, to
dissent from such amendment and require Alcan to pay them the then fair value of
their Alcan Common Shares.

Shareholders of Alcan are also entitled to rights and privileges under the
Shareholder Rights Plan, pursuant to a Shareholders Rights Agreement, dated as
of December 14, 1989, as amended and restated as of April 22, 1999, between
Alcan Aluminum Limited and CIBC Mellon Trust Company, as rights agent, which is
summarized under "Comparison of Shareholders' Rights."

                                       100


                       COMPARISON OF SHAREHOLDERS' RIGHTS

The rights of shareholders of Alcan are governed by the Canada Business
Corporations Act, provincial securities legislation and the provisions of the
Alcan Restated Articles of Incorporation and by-laws. The rights of shareholders
of Pechiney are governed by the French company law and by the provisions of the
Pechiney Articles of Association ("statuts"). The following is a summary of the
material differences between the rights of Alcan and Pechiney shareholders.
These differences arise from differences between the Canada Business
Corporations Act and the French company law and between Alcan's Restated
Articles of Incorporation and by-laws and Pechiney's statuts. For more complete
information, you should read the articles and by-laws of Alcan and the statuts
of Pechiney.



                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
 Size and                Alcan's Restated Articles of        Pechiney's statuts provide that the board
   Qualifications of     Incorporation provide that the      of directors of Pechiney shall consist of
   the Board of          board of directors of Alcan shall   no fewer than 11, nor more than 22
   Directors             consist of not less than nine, nor  members, of which no fewer than nine nor
                         more than 20 members. The board of  more than 18 shall be elected by the
                         directors of Alcan currently        shareholders of Pechiney during an
                         consists of 11 members. Under the   ordinary shareholders' meeting. These
                         Canada Business Corporations Act,   members may be natural persons or legal
                         at least 25% of the directors must  entities. As of March 25, 2003, the board
                         be resident Canadians, subject to   of directors of Pechiney consisted of 12
                         certain limited exceptions. The     members, including 3 members elected by
                         Canada Business Corporations Act    Pechiney's employees.
                         also requires that a corporation
                         whose securities are publicly       Two or, if the board is comprised of 12 or
                         traded have not fewer than three    more members, three directors must be
                         directors, at least two of whom     elected by and from among the employees of
                         are not officers or employees of    Pechiney and its direct and indirect
                         the corporation or any of its       French subsidiaries.
                         affiliates.
                                                             Also, pursuant to Pechiney's statuts, if,
                         Under the Canada Business           in the aggregate, employees hold 3% or
                         Corporations Act, directors may be  more of Pechiney's share capital, one
                         elected for a term expiring not     directors must be a designee of these
                         later than the third annual         employee-shareholders (either directly or
                         meeting of shareholders following   through a fonds commun de placement
                         the election. If no term is         d'entreprise). This designee is ultimately
                         specified, a director's term        appointed by Pechiney's shareholders
                         expires at the next following       during an ordinary shareholders' meeting
                         annual meeting of shareholders. A   from among two or more candidates
                         director may be nominated for       designated by employee-shareholders.
                         re-election to the board of         Currently, Pechiney does not have a
                         directors at the end of his or her  director designated by
                         term. Currently, all of the         employee-shareholders.
                         members of Alcan's board of
                         directors are elected at each       Under French company law, each director
                         annual meeting.                     must be a shareholder of the corporation.
                                                             Under Pechiney's statuts, a director must
                         Alcan's Restated Articles of        hold at least 200 shares for as long as he
                         Incorporation provide that the      or she serves as a director.
                         directors can appoint one or more
                         additional directors above the      French company law provides that each
                         number elected at the prior         director is eligible for reappointment
                         meeting provided that the total     upon expiration of his or her term of
                         number of directors so appointed    office, which is fixed at four years by
                         does not exceed one-third of the    Pechiney's statuts, provided that no more
                         number of directors elected at the  than one-third of the directors may be
                         previous annual meeting.            over 70 years old.
                         Alcan has a non-executive chairman  The chairman of the board of directors
                         elected by its board of directors.


                                       101





                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                                                             of Pechiney is elected by and from among
                                                             the board members.
 ------------------------------------------------------------------------------------------------------
 Duties of the Board of  Alcan's Restated Articles of        Pechiney's statuts provide that the board
   Directors             Incorporation provide for no        of directors of Pechiney determines
                         restrictions on the business the    Pechiney's strategy and ensures its
                         corporation may conduct. Under the  implementation. Subject to the powers
                         Canada Business Corporations Act,   expressly granted by the statuts or
                         the directors have the power to     pursuant to French company law to the
                         manage the business and affairs of  shareholders' meetings or to the directeur
                         Alcan and owe fiduciary duties to   general, the board takes up all questions
                         Alcan. In exercising these powers   relating to the effective operation of
                         and discharging these duties, each  Pechiney and settles all issues concerning
                         director must act honestly and in   its affairs.
                         good faith with a view to the best
                         interests of the corporation. This  Pechiney's directors owe a duty of loyalty
                         duty of care requires that the      and care to the company. The directors are
                         directors exercise the care,        held accountable, either individually or
                         diligence and skill that a          jointly, as applicable, to the company or
                         reasonably prudent person would     to third parties for breaches of
                         exercise in comparable              legislative or regulatory provisions
                         circumstances.                      applicable to public limited companies,
                                                             for violations of the statuts and for
                                                             mismanagement.
 ------------------------------------------------------------------------------------------------------
 Transactions with       Under the Canada Business           French company law provides for prior
   Interested Directors  Corporations Act, a director or     approval and control of transactions
   or Officers           officer must disclose in writing    entered into between, directly or
                         to the corporation, or request to   indirectly, the corporation and its
                         have entered in the minutes of      directors, directeur general, directeur
                         meetings of directors, the nature   general delegue, or any entity in which
                         and extent of his or her interest   any of these persons is at the same time
                         in any material contract or         an owner, partner with unlimited
                         material transaction, whether made  liability, managing director, member of
                         or proposed, with the corporation.  the supervisory board or an executive
                         If such interest exists, the        officer, unless the transaction is entered
                         director may not, subject to        in the ordinary course of business and
                         certain exceptions, vote on any     under normal terms and conditions.
                         resolution to approve the contract  Transactions entered into between a
                         or transaction. A contract or       company and one of its shareholders
                         transaction for which disclosure    holding, directly or indirectly, more than
                         of interest is required is not      10% of the voting rights, or with an
                         invalid, and the director or        entity controlling such a shareholder, are
                         officer is not accountable to the   also considered related party
                         corporation or the shareholders     transactions.
                         for any profit realized form the
                         contract or transaction, because    The interested party has the obligation to
                         of the director's or officer's      inform the board of directors of the
                         interest in the contract or         existence of the related party
                         transaction if (i) such interest    transaction.
                         is properly disclosed, (ii) the
                         contract or transaction is          Related party transactions must be pre-
                         approved by the disinterested       approved by the majority of the
                         directors or by the shareholders,   corporation's disinterested directors. The
                         and (iii) the contract or           president of the board of directors must
                         transaction was fair and            then report the authorized transaction to
                         reasonable to the corporation when  the corporation's statutory auditors
                         it was approved.                    within one month following its conclusion.
                                                             The auditors prepare a special report on
                         Where a material contract or        the transaction which is submitted to the
                         material transaction is proposed    shareholders at their next meeting, during
                         or entered into that, in the        which shareholders
                         ordinary course of the
                         corporation's business, would not
                         require approval by the directors
                         or shareholders, the interested
                         director or



                                       102




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         officer shall disclose in writing   consider the transaction for ratification
                         to the corporation or request to    (with any interested shareholder being
                         have entered in the minutes of      excluded from voting). If the transaction
                         meetings of directors, the nature   is not ratified by the shareholders, it
                         and the extent of his or her        remains enforceable by third parties as
                         interest forthwith after the        against the corporation, but the latter
                         director or officer becomes aware   may in turn hold the board of directors or
                         of the contract or transaction or   interested officer liable for any damages
                         proposed contract or transaction.   suffered as a result thereof.
                         A shareholder has the right to      Under French company law, certain related
                         access the minutes of a board       party transactions, like insider loans,
                         meeting during which a director     are strictly prohibited.
                         made a mandatory disclosure of
                         material interests in transactions  Any related party transaction concluded
                         or contracts that involve the       without the prior consent of the board of
                         corporation.                        directors can be nullified by the
                                                             corporation or any of its shareholders
                                                             acting on its behalf if it causes damages
                                                             to the corporation. Furthermore, the
                                                             interested related party may be held
                                                             liable on this basis.
 ------------------------------------------------------------------------------------------------------
 Indemnification;        Under the Canada Business           French company law prohibits provisions of
   Liability             Corporations Act, a corporation     statuts that purport to limit the
   of Directors          may indemnify a director or         liability of directors. Thus, any
                         officer of the corporation, a       provision of a French company's statuts
                         former director or officer of the   that subordinates legal proceedings
                         corporation or another individual   against directors to the prior approval or
                         who acts or acted at the            to the authorization of the general
                         corporation's request as a          shareholders' meeting or which provides in
                         director or officer or an           advance for the waiver of such proceedings
                         individual acting in a similar      is void. French company law also provides
                         capacity (collectively referred to  that a resolution adopted by the general
                         as an "indemnified individual"),    shareholders' meeting cannot result in the
                         of another entity, against all      extinction of an action brought against
                         costs, charges and expenses,        directors for damages due to breach of
                         including an amount paid to settle  duty in their official capacity.
                         an action or satisfy a judgment,
                         reasonably incurred by the          Under French company law, a company may
                         individual in respect of any        indemnify a director for legal costs and
                         civil, criminal, administrative,    expenses in only a limited number of
                         investigative or other proceeding   circumstances. If a director is sued in
                         in which the individual is          his or her capacity as a director, by a
                         involved because of that            third party and is ultimately found to
                         association with the corporation    have committed no fault and otherwise
                         or other entity.                    prevails on all counts, but is required to
                                                             bear all or some legal costs and expenses,
                         In addition, a corporation may      the company may reimburse the director
                         advance moneys to a director,       pursuant to an indemnification
                         officer or other individual for     arrangement.
                         the costs, charges and expenses of
                         a proceeding referred to in the     French company law also permits a company
                         previous paragraph. However, the    to maintain directors' and officers'
                         individual shall repay the moneys   insurance. A French corporation is
                         if he or she does not fulfill the   responsible, subject to certain
                         following indemnification           exceptions, to third parties for the
                         conditions.                         consequences of the decisions of its
                                                             directors. However, if those decisions
                         A corporation may not indemnify an  qualify as mismanagement, the relevant
                         individual, unless the individual
                             (a) acted honestly and in good
                         faith with a view to the best
                         interests of the corporation, or,
                         as the case may be, to the best
                         interests of the other entity for
                         which the individual acted as a
                         director or officer or in a
                         similar capacity at the
                         corporation's request; and


                                       103




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                             (b) in the case of a criminal   directors may, under certain conditions,
                         or administrative action or         have to indemnify the corporation in full
                         proceeding that is enforced by a    or in part.
                         monetary penalty, the individual
                         had reasonable grounds for
                         believing that the individual's
                         conduct was lawful (collectively
                         referred to as the
                         "indemnification conditions").
                         A corporation may with the
                         approval of a court indemnify an
                         indemnified individual, or advance
                         moneys as described above, in
                         respect of an action by or on
                         behalf of the corporation or other
                         entity to procure a judgment in
                         its favor, to which the individual
                         is made a party because of the
                         individual's association with the
                         corporation or other entity
                         against all costs, charges and
                         expenses reasonably incurred by
                         the individual in connection with
                         such action if the individual
                         fulfils the indemnification
                         conditions.
                         Despite the foregoing paragraphs,
                         an indemnified individual is
                         entitled to indemnity from the
                         corporation in respect of all
                         costs, charges and expenses
                         reasonably incurred by the
                         individual in connection with the
                         defense of any civil, criminal,
                         administrative, investigative or
                         other proceeding to which the
                         individual is subject because of
                         the individual's association with
                         the corporation or other entity,
                         if the individual seeking
                         indemnity:
                             (a) was not judged by the
                         court or other competent authority
                         to have committed any fault or
                         omitted to do anything that the
                         individual ought to have done; and
                             (b) fulfils the
                         indemnification conditions.
 ------------------------------------------------------------------------------------------------------
 Election and Removal    Shareholders of a corporation       Pechiney's statuts provide that its
   of Directors;         governed by the Canada Business     directors, other than the employee-
   Vacancies             Corporations Act elect directors    representative directors and employee-
                         by ordinary resolution at each      shareholder representative directors, are
                         annual meeting of shareholders at   elected by the shareholders for 4-year
                         which such an election is           terms. Non-employee directors are elected
                         required. Under the Canada          by a majority vote of Pechiney's
                         Business Corporations Act, the      shareholders at ordinary shareholders'
                         shareholders of Alcan may remove    meetings. Employee-representative
                         any director before the expiration  directors are elected by and from among
                         of his or her term of office and    Pechiney's employees. Employee-
                         may elect any qualified person in   shareholder representative directors (of
                         such director's stead for the       which Pechiney currently has none), are
                         remainder of such term by a
                         resolution passed by a majority of
                         the


                                       104




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         votes cast at a special meeting of  elected by Pechiney's shareholders from
                         shareholders called for that        among the nominees designated by
                         purpose. Under the Canada Business  Pechiney's employee-shareholders.
                         Corporations Act, vacancies that
                         exist on the board of directors     Under French company law, directors may
                         may be filled by the board if the   not be elected at a general shareholders'
                         remaining directors constitute a    meeting if the agenda for the meeting did
                         quorum. In the absence of a         not provide for the election of directors,
                         quorum, the remaining directors     unless such election is necessary to fill
                         shall call a special meeting of     a vacancy.
                         shareholders to fill the vacancy.
                                                             The members of the board of directors of
                                                             Pechiney other than those representing the
                                                             employees may be removed, with or without
                                                             cause, by a majority vote of the
                                                             shareholders. Under French company law,
                                                             removal of a director will not subject the
                                                             corporation to liability unless the
                                                             removal was injurious and/or vexatious.
                                                             Employee-representative directors may only
                                                             be removed for cause, following a decision
                                                             of the President of the Tribunal de Grande
                                                             Instance, acting upon the request of the
                                                             majority of the board of directors.
                                                             Pursuant to French company law and
                                                             Pechiney's statuts, a vacancy on the board
                                                             of directors may be filled by appointment
                                                             by the remaining directors (provided that
                                                             at least the minimum required number of
                                                             directors is in office), subject to
                                                             ratification by the shareholders at the
                                                             next ordinary general meeting. Any vacancy
                                                             left by the employee-representative
                                                             directors is immediately filled by the
                                                             employees. Any vacancy left by an
                                                             employee-shareholder representative
                                                             director is filled at the next general
                                                             meeting of shareholders.
 ------------------------------------------------------------------------------------------------------
 Shareholder Nomination  Any shareholder of a corporation    Under French company law, shareholders may
                         governed by the Canada Business     nominate individuals for the board of
                         Corporations Act may make           directors at an ordinary shareholders'
                         nominations at a shareholder        meeting. Information regarding candidates
                         meeting for the election of         must be made available to the shareholders
                         directors. Such nominations may be  by the board of directors of the
                         made as a shareholder proposal      corporation no less than 15 days before
                         that is included in the             the meeting. In addition, if the agenda
                         corporation's proxy material if     for the shareholders' meeting includes the
                         the proposal is signed by the       election of directors, any shareholder may
                         holders of not less than 5% of the  propose a candidate for election at the
                         shares of any class entitled to     shareholders' meeting, even if the
                         vote at the meeting to which the    shareholder has not followed the
                         proposal is presented.              procedures to make such nomination in
                         Shareholders of Canadian            advance of the shareholders' meeting.
                         corporations may also
                         independently solicit proxies for
                         the election to the board of
                         directors of nominees other than
                         those presented by management.
                         Historically,


                                       105





                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         Alcan's corporate governance
                         committee has recommended
                         candidates for election to the
                         board of directors and the
                         shareholders elect those nominees
                         at each annual meeting.
 ------------------------------------------------------------------------------------------------------
 Shareholders' Meetings  Under the Canada Business           Three types of shareholders' meeting exist
                         Corporations Act, the directors of  under French company law: ordinary,
                         a corporation must call an annual   extraordinary and special. French company
                         meeting not later than 18 months    law requires an annual ordinary general
                         after the corporation comes into    meeting of the shareholders to be held
                         existence and thereafter, not       within six months of the end of the
                         later than 15 months after holding  company's fiscal year.
                         the last preceding annual meeting.
                                                             All shareholders' meetings, whether
                         The Canada Business Corporations    ordinary, extraordinary or special, are
                         Act provides that special           held pursuant to an announcement published
                         shareholder meetings may be called  in a French official legal gazette
                         by the board of directors at any    (Bulletin des annonces civiles
                         time and must be called by the      obligatoires or BALO) at least 30 days
                         board of directors when             before the date of the meeting. In
                         requisitioned by holders of not     addition, a notice convening the meeting
                         less than 5% of the issued shares   must be published in the BALO and in a
                         of the corporation that carry the   newspaper authorized to publish legal
                         right to vote at the meeting        announcements. This convening notice must
                         sought. If the board of directors   appear no fewer than 15 days for the first
                         fails to call a properly            notice (on first call) and six days for
                         requisitioned meeting within 21     the following notice (on second call). The
                         days after receiving the request,   same notice must be sent to each
                         any shareholder who signed the      shareholder holding shares in registered
                         requisition may call the meeting.   form at least one month prior to the date
                                                             of the publication in the newspaper and to
                         Shareholders' meetings, whether     the auditors of the company. In the event
                         annual or special, shall be held    the board of directors of Pechiney fails
                         within Canada. However, a meeting   to publish such notice or call a required
                         may be held at a place outside      meeting, a meeting may be convened by
                         Canada if the place is specified    Pechiney's statutory auditor or a court
                         in the articles or if all the       appointed agent. A court may be requested
                         shareholders entitled to vote at    to appoint an agent by:
                         the meeting agree that the meeting
                         is to be held at that place.        - one or more shareholders holding in the
                         Notice of the time and place of a   aggregate at least 5% of the capital for a
                         meeting must be sent by the         general meeting or 5% of a specific
                         corporation not less than 21 nor    category of shares for special meetings;
                         more than 50 days before the
                         meeting to each shareholder         - the employees' committee in case of
                         entitled to vote at the meeting,    emergency;
                         each director of the corporation
                         and the auditors of the             - any interested party in cases of
                         corporation. On the application of  emergency; or
                         a director, a shareholder entitled
                         to vote at a meeting or the         - as long as Pechiney remains listed on
                         Director appointed under the        the Euronext Paris, certain duly qualified
                         Canada Business Corporations Act,   associations of shareholders.
                         a court may order a shareholder
                         meeting to be held.                 Quorum for an ordinary general
                                                             shareholders' meeting consists of the
                         Under Alcan's by-laws, the holders  holders of 25% of the shares entitled to
                         of 40% of the shares entitled to    vote at this meeting on the first call,
                         vote at a meeting, present in       with no quorum on the second call, if
                         person or by proxy, constitute a
                         quorum.
                         Any person entitled to notice of a
                         shareholder meeting may attend
                         that meeting. A shareholder may
                         appoint a proxyholder, who need
                         not be a



                                       106




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         shareholder, to attend and act at   required. Quorum for an extraordinary
                         the meeting in accordance with the  shareholders' meeting consists of 33.33%
                         authority conferred by the proxy.   of the shares entitled to vote at this
                                                             meeting on the first call, and 25% of the
                                                             shares on the second call, if required.
                                                             Quorum for a special shareholders' meeting
                                                             consists of the holders of 50% of the
                                                             shares entitled to vote at the meeting on
                                                             the first call, and 25% of the shares on
                                                             the second call, if required.
                                                             At ordinary shareholders' meetings, action
                                                             is taken by a majority of the votes cast,
                                                             whereas a super-majority equal to
                                                             two-thirds of the votes cast is required
                                                             for most actions taken at any
                                                             extraordinary shareholders' meeting or any
                                                             special shareholders' meeting.
                                                             Attendance at a shareholders' meeting is
                                                             subject to certain conditions, including:
                                                             - a holder of registered shares must have
                                                             its shares in its name;
                                                             - a holder of bearer shares must obtain
                                                             from the accredited financial intermediary
                                                             a certificate indicating the number of
                                                             shares owned by such holder (certificat
                                                             d'immobilisation) and stating that such
                                                             shares are not transferable until the date
                                                             and time fixed for such meeting.
                                                             Under French law, certain additional
                                                             conditions apply to shareholders holding
                                                             shares through a mandatory or other
                                                             representative.
                                                             Subject to these conditions, all
                                                             shareholders, upon proof of their
                                                             identity, have the right to participate in
                                                             shareholders' meetings.
 ------------------------------------------------------------------------------------------------------
 Shareholders'           Under the Canada Business           Under French company law, shareholders
   Proposals             Corporations Act, an eligible       representing, individually or
                         registered holder or beneficial     collectively, a defined percentage (less
                         owner of shares who is entitled to  than 5%) of the capital of Pechiney may
                         vote at an annual meeting of        request that a resolution that they
                         shareholders may submit a proposal  proposed for adoption at the shareholder
                         consisting of matters that the      meeting be included in the agenda. Such
                         person proposes to raise at the     request must be made within 10 days of the
                         next annual meeting. Upon receipt   publication of the announcement notice of
                         of the proposal, a corporation      the shareholders' meeting in the BALO and
                         that solicits proxies shall set     must specify the reasons for such
                         out the proposal in the management  resolution. In addition, French company
                         proxy circular and, if requested    law requires that the board of directors
                         by the shareholder, include in the  of Pechiney respond during such meeting to
                         management proxy circular a         any questions submitted in writing by any
                         statement by the shareholder of     shareholder.
                         not more than 500 words in support
                         of the proposal, and the name and
                         address of the shareholder.
                         A corporation may within 21 days
                         after


                                       107




                                       ALCAN                                  PECHINEY
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                         receiving a shareholder proposal,
                         notify the shareholder of its
                         intention to omit the proposal
                         from the management proxy circular
                         if:
                         - the proposal is not submitted to
                         the corporation at least 90 days
                         before the anniversary date of the
                         notice of meeting that was sent to
                         shareholders in connection with
                         the previous annual meeting of
                         shareholders;
                         - it clearly appears that the
                         primary purpose of the proposal is
                         to enforce a personal claim or
                         redress a personal grievance
                         against the corporation or its
                         directors, officers or security
                         holders;
                         - it clearly appears that the
                         proposal does not relate in a
                         significant way to the business or
                         affairs of the corporation;
                         - not more than two years before
                         the receipt of a proposal, a
                         person failed to present, in
                         person or by proxy, at a meeting
                         of shareholders, a proposal that
                         at the person's request, had been
                         included in a management proxy
                         circular relating to the meeting;
                         - substantially the same proposal
                         was submitted to shareholders in a
                         management proxy circular or a
                         dissident's proxy circular
                         relating to a meeting of
                         shareholders held not more than
                         five years before the receipt of
                         the proposal and did not receive
                         the prescribed minimum amount of
                         support at the meeting; or
                         - the right to submit a proposal
                         is being abused to secure
                         publicity.
 ------------------------------------------------------------------------------------------------------
 Payment of Dividends    Under the Canada Business           The distributable profits (benefice
                         Corporations Act, a corporation     distribuable) available for distribution
                         may pay a dividend by issuing       to the shareholders of a French company as
                         fully paid shares of the            dividends are comprised of net income in
                         corporation. A corporation may      each fiscal year, after deduction for
                         also pay a dividend in money or     depreciation and provisions, as increased
                         property unless there are           or reduced, as the case may be, by a
                         reasonable grounds for believing    profit or loss carried forward from prior
                         that:                               years, less any contributions to legal
                                                             reserves.
                         (1) the corporation is, or would
                         after the payment be, unable to     Under French law, Pechiney is required to
                         pay its liabilities as they become  allocate five percent of its net profits
                         due; or                             in each fiscal year to a legal reserve
                                                             fund until the amount in such reserve fund
                         (2) the realizable value of the     is equal to 10% of the nominal amount of
                         corporation's assets would thereby  the outstanding share capital. This legal
                         be less than the aggregate of its   reserve is distributable only upon the
                         liabilities and stated capital of   liquidation of the company.
                         all classes.
                         The board of directors declares
                         the payment of dividends and
                         determines the amount thereof.


                                       108




                                       ALCAN                                  PECHINEY
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                                                             Except in the case of a decrease in share
                                                             capital, no distribution may be made to
                                                             shareholders, if as a result of such
                                                             distribution, the shareholders' equity
                                                             would fall below the amount of the share
                                                             capital increased by those reserves which
                                                             may not be distributed according to
                                                             applicable legal provisions or the
                                                             statuts. The amount of dividends is fixed
                                                             at the ordinary general meeting of
                                                             shareholders at which the annual accounts
                                                             are approved, following the prior
                                                             recommendation of the board of directors.
                                                             If the company has earned a profit since
                                                             the end of the preceding fiscal year, the
                                                             board of directors may, in certain
                                                             instances, distribute interim dividends to
                                                             the extent of such profit.
 ------------------------------------------------------------------------------------------------------
 Voting Rights           Under the Canada Business           According to Pechiney's statuts, each
                         Corporations Act, an amendment to   share entitles its holder to one vote.
                         a corporation's articles generally  Under French company law, the fundamental
                         requires shareholder approval by    actions, including the following, require
                         special resolution. A special       the approval of the holders of a qualified
                         resolution is a resolution passed   majority of at least two-thirds ( 2/3) of
                         by a majority of not less than      the shares entitled to vote:
                         two-thirds of the votes cast by
                         the shareholders who are entitled   - amendments to the statuts;
                         to vote on the resolution in
                         person or by proxy at the annual    - transfer of the registered office to a
                         or special meeting called for such  non-neighboring department;
                         purpose, whether or not the shares
                         held by them are designated as      - increase or decrease of share capital;
                         voting shares in the corporation's
                         articles of incorporation. In       - denial of the shareholders' preemptive
                         certain cases, a special            rights;
                         resolution to approve an
                         extraordinary corporate action,     - authorization of employee stock option
                         such as an amendment to the         and/or purchase plans;
                         articles of incorporation that
                         adversely affects the rights of a   - authorizations of mergers, spin-offs,
                         particular class or series of       partial contribution of assets,
                         shares, may also be required to be  dissolution of the corporation, as well
                         approved separately by the holders  as, disposition of all or substantially
                         of a class or series of shares,     all of the assets of Pechiney if such
                         including a class or series that    disposition would entail a modification of
                         does not otherwise carry the right  the company's corporate purpose; and
                         to vote.
                                                             - the issuance of share capital.
                         Under the Canada Business
                         Corporations Act, unless the        In addition, the transformation of the
                         articles or by-laws otherwise       corporation into another type of legal
                         provide, the directors may, by      entity requires, depending on the new type
                         resolution, make, amend or repeal   of entity, either a unanimous vote of the
                         any by-law that regulates the       shareholders or the approval of the
                         business or affairs of a            holders of a qualified majority of at
                         corporation. Where the directors    least 75% or two-thirds ( 2/3) of the
                         make, amend or repeal a by-law,     shares entitled to vote.
                         they are required under the Canada
                         Business Corporations Act to
                         submit the by-law, amendment or
                         repeal to the shareholders at the
                         next meeting of shareholders. The
                         shareholders may confirm, reject
                         or amend the by-law,


                                       109




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         amendment or repeal, by an
                         ordinary resolution, which is a
                         resolution passed by a majority of
                         the voting shareholders.
                         Under the Canada Business
                         Corporations Act, the following
                         transactions also require
                         shareholder approval by special
                         resolution:
                         - amalgamations, other than an
                         amalgamation between a parent
                         corporation and one or more of its
                         wholly-owned subsidiaries or
                         between two or more of such
                         subsidiaries, continuances, sales,
                         leases or exchanges of all or
                         substantially all of the property
                         of a corporation other than in the
                         ordinary course of business;
                         - liquidations; and
                         - dissolutions.
                         In certain cases, a special
                         resolution to approve an
                         extraordinary corporate action
                         must also be approved separately
                         by the holders of a class or
                         series of shares or by a majority
                         of the votes cast by disinterested
                         shareholders.
                         A corporation may also apply to a
                         court for an order approving an
                         arrangement, which could include
                         an amendment of the corporation's
                         articles, an amalgamation, a
                         transfer of all or substantially
                         all the property of a corporation
                         to another corporation in exchange
                         for property, money or securities
                         of the corporation, or liquidation
                         and dissolution of the corporation
                         where it is not insolvent and
                         where it is not practicable for
                         the corporation to make such
                         fundamental change in accordance
                         with the provisions of the Canada
                         Business Corporations Act. The
                         court may make any interim or
                         final order it thinks fit with
                         respect to such proposed
                         arrangement. Generally, an
                         arrangement involving a public
                         company must receive shareholder
                         approval as a condition of
                         obtaining the court order.
 ------------------------------------------------------------------------------------------------------
 Appraisal Rights        The Canada Business Corporations    There are no appraisal rights under French
                         Act provides that shareholders      company law or Pechiney's statuts. Under
                         entitled to vote on certain         applicable French stock market
                         matters are entitled to exercise    regulations, the CMF is responsible for
                         dissent rights and be paid the      deciding upon the acceptability of a
                         fair value of their shares. The     tender offer by analyzing the value of the
                         Canada Business Corporations Act    consideration
                         does not distinguish for this
                         purpose between


                                       110




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         listed and unlisted shares. Such    offered with reference to customary
                         matters include the following:      valuation criteria and the nature of the
                                                             target company. Its avis de recevabilite
                         - any amalgamation with a           can be challenged in court by any
                         corporation, other than with        interested party during 10 days.
                         certain subsidiary corporations;
                                                             For additional information, see the
                         - an amendment to the articles to   discussion under "Take-Over Bids and
                         add, change or remove any           Compulsory Acquisition of Shares" below.
                         provisions restricting the issue,
                         transfer or ownership of shares;
                         - a continuance under the laws of
                         another jurisdiction;
                         - a sale, lease or exchange of all
                         or substantially all of the
                         property of the corporation other
                         than in the ordinary course of
                         business;
                         - a proposed arrangement
                         transaction, where a court order
                         issued in connection with an
                         application for court approval of
                         the arrangement permits the
                         exercise of dissent rights; or
                         - certain amendments to the
                         articles of a corporation which
                         require a separate class or series
                         vote, provided that a shareholder
                         is not entitled to dissent if an
                         amendment to the articles is
                         effected by a court order made in
                         connection with an action for an
                         oppression remedy.
                         Under the Canada Business
                         Corporations Act, a shareholder
                         may, in addition to exercising
                         dissent rights, seek an oppression
                         remedy for any act or omission of
                         a corporation which is oppressive,
                         unfairly prejudicial to or that
                         unfairly disregards a
                         shareholder's interest.
 ------------------------------------------------------------------------------------------------------
 Oppression Remedy       The Canada Business Corporations    Under French company law, a shareholder
                         Act provides an oppression remedy   may not exercise its voting right in a
                         that enables the court to make any  manner that (i) is contrary to the
                         order, both interim and final, to   interest of the company, and (ii) has the
                         rectify the matters complained of   sole purpose of unfairly favoring a
                         if the court is satisfied, upon     particular group of shareholders (e.g., a
                         application by a complainant, as    majority or a group of minority
                         defined below, that:                shareholders) to the detriment of the
                                                             other shareholders.
                         - any act or omission of the
                         corporation or an affiliate         Damages may be sought by any shareholder
                         effects a result,                   that is harmed, and a proceeding for
                                                             nullity of the vote may be brought by any
                         - the business or affairs of the    shareholder or director of the company.
                         corporation or an affiliate are or
                         have been carried on or conducted,  French company law provides that the
                         or                                  complainant may claim for the entire
                                                             prejudice suffered by the company. A
                         - the powers of the directors of    complainant may also seek nullity of the
                         the corporation or an affiliate
                         are or have been exercised
                         in a manner that is oppressive or
                         unfairly prejudicial to, or that
                         unfairly


                                       111




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         disregards the interests of, any    action claimed to be oppressive. The court
                         security holder, creditor,          may order the company to pay for the
                         director or officer of the          complainant's legal costs and
                         corporation or an affiliate.        disbursements.
                         A complainant includes:             The statute of limitations for a
                                                             shareholder suit is 3 years from the date
                         - a present or former registered    of the action giving rise to the damages,
                         holder or beneficial owner of       or, in certain cases, from the date of its
                         securities of a corporation or any  discovery, unless the action is qualified
                         of its affiliates;                  as criminal, in which case the statute of
                                                             limitation would be 10 years.
                         - a present or former officer or
                         director of the corporation or any
                         of its affiliates;
                         - the director appointed under the
                         Canada Business Corporations Act;
                         and
                         - any other person who in the
                         discretion of the court is a
                         proper person to make such an
                         application.
                         Because of the breadth of the
                         conduct which can be complained of
                         and the scope of the court's
                         remedial powers, including the
                         power to order liquidation and
                         dissolution of the corporation
                         concerned, the oppression remedy
                         is very flexible and may be relied
                         upon to safeguard the interests of
                         shareholders and other
                         complainants that have a
                         substantial interest in the
                         corporation. Under the Canada
                         Business Corporations Act, it is
                         not necessary to prove that the
                         directors of a corporation acted
                         in bad faith in order to seek an
                         oppression remedy.
                         Additionally, under the Canada
                         Business Corporations Act, a court
                         may order a corporation or its
                         subsidiary to pay the
                         complainant's interim costs,
                         including legal fees and
                         disbursements. Although the
                         complainant may be held
                         accountable for the interim costs
                         on final disposition of the
                         complaint, it is not required to
                         give security for costs in an
                         oppression action.
 ------------------------------------------------------------------------------------------------------
 Shareholder Suits       Under the Canada Business           Under French company law, any shareholder,
                         Corporations Act, a complainant     whatever percentage of the capital of
                         may apply to the court for leave    Pechiney it represents, or any group of
                         to bring an action in the name of   shareholders representing, in the
                         and on behalf of a corporation or   aggregate, a certain portion of the
                         any subsidiary, or to intervene in  capital of Pechiney (depending on the
                         an existing action to which such    outstanding capital of Pechiney), may
                         corporation is a party, for the     bring an action for and on behalf of
                         purpose of prosecuting, defending   Pechiney (action sociale) against board
                         or discontinuing the action on      members to allow the corporation to
                         behalf of the corporation or any    recover any damages suffered by it.
                         subsidiary. Under the Canada
                         Business Corporations Act, no
                         action may be brought and no
                         intervention in an action may be
                         made unless the court is


                                       112




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         satisfied that:
                         - the complainant has given 14
                         days notice to the directors of
                         the corporation or its subsidiary
                         of the complainant's intention to
                         apply to the court and the
                         directors of the corporation or
                         its subsidiary do not bring,
                         diligently prosecute or defend or
                         discontinue the action;
                         - the complainant is acting in
                         good faith; and
                         - it appears to be in the
                         interests of the corporation or
                         its subsidiary that the action be
                         brought, prosecuted, defended or
                         discontinued.
                         Under the Canada Business
                         Corporations Act, the court in
                         such a derivative action may make
                         any order it thinks fit including:
                         - an order authorizing the
                         complainant or any other person to
                         control the conduct of the action;
                         - an order giving directions for
                         the conduct of the action;
                         - an order directing that any
                         amount adjudged payable by a
                         defendant in the action shall be
                         paid, in whole or in part,
                         directly to former and present
                         security holders of the
                         corporation or its subsidiary
                         instead of to the corporation or
                         its subsidiary; and
                         - an order requiring the
                         corporation or its subsidiary to
                         pay legal fees and any other costs
                         reasonably incurred by the
                         complainant in connection with the
                         action.
                         Additionally, under the Canada
                         Business Corporations Act, a court
                         may order a corporation or its
                         subsidiary to pay the
                         complainant's interim costs,
                         including legal fees and
                         disbursements. Although the
                         complainant may be held
                         accountable for the interim costs
                         on final disposition of the
                         complaint, the complainant is not
                         required to give security for
                         costs in a derivative action. Once
                         commenced, a derivative proceeding
                         may not be discontinued or settled
                         without the court's approval.
 ------------------------------------------------------------------------------------------------------
 Inspection of Books     The shareholders, directors and     Under French corporate law shareholders or
   and Records           creditors of a corporation          their proxies may examine a number of
                         incorporated under the Canada       corporate records relating to the previous
                         Business Corporations Act, and      three fiscal years, including:
                         their agents and legal
                         representatives, may examine:


                                       113




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         - the corporation's articles and    - the corporation's statuts;
                         by-laws and any amendments
                         thereto;                            - shareholder lists, including the name,
                                                             address and shareholding of registered
                         - minutes of meetings and           shareholders;
                         resolutions of the corporation's
                         shareholders;                       - consolidated financial statements;
                         - a list of directors; and          - reports of the board of directors and
                                                             the statutory auditors;
                         - a securities register;
                                                             - proposed resolutions;
                         during the usual business hours of
                         the corporation free of charge. A   - minutes of shareholders' meetings;
                         shareholder of the corporation is
                         entitled, on request and without    - information relating to directorial
                         charge, to take extracts from       candidates;
                         those materials and to receive one
                         copy of the articles and by-laws    - the total overall compensation paid to
                         of the corporation and any          the corporation's ten highest-paid
                         amendments thereto.                 employees;
                         As Alcan is a public company, any   - the list of attendees at shareholders'
                         person, upon payment of a           meetings; and
                         reasonable fee and providing to
                         Alcan or its agent an affidavit     - a list of the corporation's directors
                         confirming the name and address of  and statutory auditors.
                         the applicant and stating that the
                         list and any supplemental lists     Shareholders may consult and make a copy
                         obtained will not be used other     of the documents listed above at any time
                         than in connection with:            at the company's registered office.
                                                             Shareholders also have the right to make
                         - an effort to influence            one copy of the documents that are
                         shareholder voting;                 available for consultation.
                         - an offer to acquire securities    Shareholders have additional inspection
                         of Alcan; or                        rights prior to a shareholders' meeting.
                                                             Prior to a shareholders' meeting,
                         - any other matter relating to the  shareholders have the right to receive
                         affairs of Alcan;                   information, including:
                         may require Alcan or its agent to   - the agenda for the meeting;
                         provide a current list setting out
                         the names of Alcan's registered     - a table showing results of operations
                         holders of shares, options and      for the previous five years;
                         rights, the number of shares owned
                         by each shareholder and the         - the report of the board of directors
                         address of each holder of shares    that will be presented at the meeting;
                         and rights as shown on the records
                         of the corporation.                 - a summary of the company's financial
                                                             situation over the previous fiscal year
                                                             and the latest annual financial
                                                             statements;
                                                             - the statutory auditors' reports; and
                                                             - the proposed resolutions to be presented
                                                             at the meeting.
                                                             During this period, shareholders may
                                                             always consult the list of the
                                                             corporation's shareholders.
 ------------------------------------------------------------------------------------------------------
 Preemptive Rights       Under the Canada Business           Under French company law, an existing
                         Corporations Act, if the articles   shareholder of a corporation has a
                         of a corporation so provide, no     preemptive right to subscribe for any
                         shares of a class shall be issued,  shares or any securities convertible into,
                         except in limited circumstances,    or otherwise giving access to, shares
                         unless the shares have first been   either immediately or with the passage of
                         offered to shareholders holding     time and issued by such corporation in
                         shares of that class, and those     proportion to the shares already held
                         shareholders have preemptive
                         rights to


                                       114




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         acquire the offered shares in       by such shareholder, unless such right is
                         proportion to their holdings of     excluded at an extraordinary general
                         the shares of that class, at such   shareholders' meeting with a two-thirds
                         price and on such terms as those    majority. According to French company law,
                         shares are to be offered to         under certain conditions, unexercised
                         others. Alcan's Restated Articles   preemptive rights may be individually
                         of Incorporation do not currently   waived by the shareholders or transferred
                         provide for preemptive rights of    to third parties. If expressly authorized
                         the holders of any of its           at the extraordinary general shareholders'
                         outstanding shares.                 meeting approving the capital increase,
                                                             the shareholders, as well as the third
                                                             parties to whom preemptive rights were
                                                             transferred, may subscribe for the shares
                                                             subject to the capital increase above and
                                                             beyond their pro rata interest in the
                                                             share capital of the corporation by
                                                             subscribing the stock reserved for
                                                             shareholders who neither exercised nor
                                                             transferred their preemptive rights.
 ------------------------------------------------------------------------------------------------------
 Take-Over Bids and      If a share acquisition constitutes  Under applicable French stock exchange
   Compulsory            a take-over bid and is not          regulations, where a natural person or a
   Acquisition of        otherwise exempt, it must be made   legal entity, acting alone or in concert,
   Shares                to all holders of the relevant      come to hold, directly or indirectly, more
                         class by way of a formal offer and  than a third of the securities or more
                         offering circular in the form       than a third of the voting rights of a
                         prescribed under Canadian           listed company, this person or legal
                         securities legislation. A           entity is obliged to make a tender offer
                         "take-over bid" includes any offer  for the entire capital of the company and
                         to acquire a number of voting       the other securities giving access, either
                         securities which, when added to     immediately or with the passage of time,
                         the existing holdings of the        to the capital or to the voting rights of
                         offeror and its joint actors,       the company. Such offer must be on terms
                         would constitute 20% or more of     and conditions that are acceptable to the
                         that class of securities. The bid   CMF.
                         must remain open for a period of
                         35 days and, if the consideration   The same provisions apply to any natural
                         offered under the bid includes      person or legal entity acting alone or in
                         shares, the bid documents must      concert:
                         contain prospectus-like disclosure
                         with respect to the issuer of the   (i) which holds directly or indirectly
                         shares. There are several           between one-third and one-half of the
                         exemptions under which an offer     securities or the voting rights of a
                         which constitutes a "take-over      company and which, in less than twelve
                         bid" may be made on an "exempt      consecutive months, increases the number
                         basis"; that is, without that       of securities or the voting rights it
                         offer having to be extended to all  holds in the Company by at least 2%; or
                         security holders. The most
                         frequently used exemptions are:     (ii) where more than one-third of the
                                                             capital or voting rights of a listed
                         - the private purchase exemption,   company is held by another company and
                         which permits acquisitions of any   constitutes an essential part of such
                         number of securities in private     company's assets and where:
                         agreements with not more than 5
                         persons or companies if the value       (a) a person acquires the control (as
                         of the consideration does not       determined by French company law) of this
                         exceed 115% of the market price of  other company; or
                         the class of securities; and
                                                                 (b) a group of persons acting in
                         - normal course purchases in any    concert holds more than 50% of the capital
                         12-month period through the         or of
                         facilities of a stock exchange of
                         up to 5% of the class of
                         securities outstanding at the


                                       115





                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         commencement of such period at      the voting rights of this other company
                         prices not in excess of the market  without any of these persons continuing to
                         price.                              hold the control individually.
                         Under the Canada Business           French stock exchange regulations provide
                         Corporations Act, if within 120     certain exemptions to the obligation to
                         days of a take-over bid the         make such mandatory offer, which could be
                         holders of 90% of the shares of     allowed by the CMF.
                         any class, excluding shares held
                         by or on behalf of the offeror,     The bid must, subject to certain
                         accept the take-over bid of that    exceptions, remain open for a period of 25
                         offeror, the offeror is entitled    trading days.
                         to acquire the remaining shares of
                         that class. The holders of the      Under applicable French stock market
                         shares not tendered to the          regulations, a shareholder who comes to
                         take-over bid may elect to          hold, alone or in concert, at least 95% of
                         transfer the shares to the offeror  the total voting rights of a listed
                         on the terms of the take-over bid   company may initiate a withdrawal offer
                         or to demand payment of the fair    (offre publique de retrait), or buy-out,
                         value of those shares.              which, if following the buy-out the
                                                             shareholder also holds, alone or in
                         The securities laws and policies    concert, at least 95% of the total share
                         of certain Canadian provinces       capital in the listed company, could be
                         regulate take-over bids and         followed by a compulsory acquisition or
                         related transactions involving      squeeze out (retrait obligatoire) of the
                         Canadian public companies,          remaining minority shareholders. In the
                         including bids for securities of a  case of one majority shareholder holding
                         corporation by its insiders, bids   95% of the total share capital and voting
                         by a corporation to acquire its     rights, any holder of voting equity
                         own securities and going private    securities who does not belong to the
                         transactions in which the           majority group can also apply to the CMF
                         interests of shareholders would be  to require the majority shareholder or
                         terminated in certain               group of shareholders to file a withdrawal
                         circumstances, such as a            offer, and to thus offer to acquire the
                         compulsory acquisition of shares    shares of the minority.
                         described in the preceding
                         paragraph. Depending on the
                         circumstances, these laws and
                         policies seek to enhance minority
                         shareholder protections by
                         providing for such things as
                         independent valuations, approval
                         by a majority of the minority
                         shareholders concerned and
                         enhanced disclosure, and by
                         recommending the use of
                         independent directors to review
                         such matters.
 ------------------------------------------------------------------------------------------------------
 Shareholder Rights      Each of the Alcan Common Shares     Pechiney does not have a shareholder
   Plan                  carries one right to purchase       rights plan.
                         additional common shares pursuant
                         to the Company's Shareholder
                         Rights Plan. The terms of the
                         rights are contained in the
                         Shareholders Rights Agreement,
                         which is governed by the laws of
                         Ontario and Canada. The rights
                         expire in 2008, subject to
                         re-confirmation at the Annual
                         Meeting of Shareholders in 2005.
                         The rights under the rights plan
                         are not currently exercisable, nor
                         may they be separated from the
                         Alcan Common Shares. Subject to
                         specified exceptions and
                         qualifications, on the tenth
                         business



                                       116




                                       ALCAN                                  PECHINEY
 ------------------------------------------------------------------------------------------------------
                                                       
                         day after the first to occur of:
                         - the acquisition by a person or
                         group of affiliated or associated
                           persons of beneficial ownership
                           of 20% or more of Alcan's
                           outstanding voting shares; or
                         - a bid to acquire 20% or more of
                           Alcan's outstanding voting
                           shares,
                         holders of rights, with the
                         exception of the acquiring or
                         bidding party, will be entitled to
                         purchase from Alcan, upon payment
                         of the exercise price (currently
                         $200.00), the number of Alcan
                         Common Shares that can be
                         purchased for double the exercise
                         price, based on the market value
                         of the Alcan Common Shares at the
                         time the rights become
                         exercisable. At and after such
                         time the rights will also be
                         transferable separately from the
                         Alcan Common Shares. The exercise
                         price mentioned above is subject
                         to adjustment according to the
                         terms of the rights plan to
                         account for, among other things,
                         adjustments to the Alcan Common
                         Shares such as stock splits, stock
                         dividends and distributions to
                         shareholders.
                         The rights agreement has a
                         permitted bid feature which allows
                         a take-over bid to proceed without
                         the rights becoming exercisable,
                         provided that the bid meets
                         specified minimum specified
                         standards of fairness and
                         disclosure, even if the board of
                         directors of Alcan does not
                         support the bid.
                         The rights may be redeemed by the
                         board of directors of Alcan prior
                         to the expiration or
                         reauthorization of the rights
                         agreement, with the prior consent
                         of the holders of rights or Alcan
                         Common Shares, for $0.01 per
                         right. In addition, under
                         specified conditions, the board of
                         directors of Alcan may waive the
                         application of the rights
                         agreement for particular share
                         acquisitions or take-over bids,
                         and in that event the board of
                         directors of Alcan will be deemed
                         to have elected to redeem the
                         rights at $0.01 per right.


                                       117


                    ALCAN'S DIRECTORS AND EXECUTIVE OFFICERS

      INTERESTS OF DIRECTORS AND EXECUTIVE OFFICERS OF ALCAN AND PECHINEY

ALCAN


Based on the number of Alcan Common Shares issued and outstanding on July 31,
2003, the directors and officers of Alcan, individually and the group as a
whole, held less than one percent of the issued and outstanding Alcan Common
Shares.


PECHINEY

Pechiney's 2002 20-F states that, as of December 31, 2002, none of Pechiney's
directors and executive officers held Pechiney securities that, combined with
options to purchase Pechiney Common Shares they held, would have entitled them
to beneficially own one percent or more of any class of Pechiney securities

   ADDITIONAL INFORMATION REGARDING ALCAN'S DIRECTORS AND EXECUTIVE OFFICERS


Each of the Directors of Alcan is a citizen of Canada, except for Mr. Travis
Engen and Mr. William R. Loomis, Jr., who are citizens of the United States of
America, and Mr. Roland Berger and Mr. Gerhard Schulmeyer, who are citizens of
the Federal Republic of Germany. In addition, Mr. Clarence J. Chandran holds a
dual citizenship of Canada and the United States of America.


Each of the Executive Officers of Alcan is a citizen of Canada, except for Mr.
Travis Engen, Mr. Richard B. Evans, Mr. Brian W. Sturgell, Ms. Cynthia Carroll,
Ms. Martha Finn Brooks and Mr. Thomas J. Harrington, who are citizens of the
United States of America, Mr. Christopher Bark-Jones, who is a citizen of the
United Kingdom, Mr. Kurt Wolfensberger, who is a citizen of Switzerland, and Mr.
Armin Weinhold, who is a citizen of the Federal Republic of Germany.

                                       118


                         MARKET PRICE AND DIVIDEND DATA

                                 MARKET PRICES

ALCAN

The principal trading markets for Alcan Common Shares are the New York Stock
Exchange and The Toronto Stock Exchange. The table below sets forth, for the
periods indicated, the reported high and low quoted prices of the Alcan shares
on the New York Stock Exchange and The Toronto Stock Exchange.




                                                  NEW YORK STOCK           TORONTO STOCK
                                                  EXCHANGE PRICE        EXCHANGE PRICE PER
                                                 PER ALCAN SHARE            ALCAN SHARE
                                              ----------------------    -------------------
                                                HIGH          LOW         HIGH       LOW
                                              --------      --------    --------   --------
                                              (U.S. $)      (U.S. $)    (CAN $)    (CAN $)
                                                                       
2001
First Quarter...............................   39.86         33.00       61.76      49.45
Second Quarter..............................   48.50         35.50       73.70      56.37
Third Quarter...............................   43.76         28.95       67.50      45.50
Fourth Quarter..............................   37.56         28.94       59.25      46.95
2002
First Quarter...............................   41.78         34.53       65.73      55.60
Second Quarter..............................   40.00         35.27       62.95      53.61
Third Quarter...............................   37.04         23.87       56.11      37.76
Fourth Quarter..............................   32.05         23.39       50.10      37.25
2003
First Quarter...............................   31.97         26.45       49.29      39.08
Second Quarter..............................   32.74         27.48       44.21      39.75
Third Quarter (through August 26, 2003).....   36.65         29.53       51.65      40.71



PECHINEY

Pechiney Common Shares are listed for trading on the Premier Marche of Euronext
Paris under the ISIN code FR0000132904. Pechiney ADSs are listed on the New York
Stock Exchange. The table below sets forth,

                                       119


for the periods indicated, the reported high and low quoted prices of the
Pechiney Common Shares on the Premier Marche of Euronext Paris and of the
Pechiney ADSs on the New York Stock Exchange.




                                             PRICE PER PECHINEY
                                                COMMON SHARE         PRICE PER PECHINEY ADSS
                                             ------------------      ------------------------
                                              HIGH        LOW          HIGH            LOW
                                             ------      ------      ---------      ---------
                                             (EURO)      (EURO)      (U.S. $)       (U.S. $)
                                                                        
2001
First Quarter..............................  57.30       43.50         26.30          19.70
Second Quarter.............................  68.60       45.22         30.00          20.35
Third Quarter..............................  63.40       30.04         26.80          16.05
Fourth Quarter.............................  59.40       40.35         26.05          18.65
2002
First Quarter..............................  63.80       57.05         28.13          25.25
Second Quarter.............................  61.85       45.20         27.75          22.65
Third Quarter..............................  48.93       26.90         24.10          13.58
Fourth Quarter.............................  39.60       24.50         19.50          12.17
2003
First Quarter..............................  34.30       20.37         18.00          13.95
Second Quarter.............................  32.21       22.10         18.00          12.30
Third Quarter (through August 26, 2003)....  46.30       30.01         26.20          17.48



Pechiney OCEANEs are listed for trading on the Premier Marche of Euronext Paris
under the ISIN code FR0000188401. The table below sets forth, for the periods
indicated, the reported high and low quoted prices of the Pechiney OCEANEs on
Euronext Paris.




                                                                 PRICE PER
                                                              PECHINEY OCEANE
                                                              ---------------
                                                               HIGH     LOW
                                                              ------   ------
                                                              (EURO)   (EURO)
                                                              ------   ------
                                                                 
2002
Second Quarter (beginning April 4, 2002)....................  76.30    71.00
Third Quarter...............................................  72.00    63.00
Fourth Quarter..............................................  75.00    66.55
2003
First Quarter...............................................  75.85    69.00
Second Quarter..............................................  72.00    71.25
Third Quarter (through August 22, 2003).....................  82.00    74.20




Pechiney Bonus Allocation Rights were listed for trading on the Premier Marche
of Euronext Paris under the ISIN code FR0000951634 until August 4, 2003, and
have since been trading over-the-counter. The table below sets forth, for the
periods indicated, the reported high and low quoted prices of the Pechiney Bonus
Allocation Rights on the Euronext Paris.





                                                                  PRICE PER
                                                               PECHINEY BONUS
                                                              ALLOCATION RIGHT
                                                              -----------------
                                                               HIGH       LOW
                                                              -------   -------
                                                              (EURO)    (EURO)
                                                                  
2003
Second Quarter (beginning June 3, 2003).....................   3.44      2.22
Third Quarter (through August 26, 2003).....................   4.90      2.86



                                       120


                                   DIVIDENDS


Alcan.  The following table sets forth the aggregate amounts of dividends paid
on each Alcan Common Share in respect of the six-month period ended June 30,
2003 and each of the five fiscal years ended December 31, 2002.





                                                                U.S. DOLLARS PER
                                                               ALCAN COMMON SHARE
                                                              ---------------------
                                                           
Six-month period ended June 30, 2003........................   0.30 (0.15 quarterly)
Year ended December 31,
  2002......................................................   0.60 (0.15 quarterly)
  2001......................................................   0.60 (0.15 quarterly)
  2000......................................................   0.60 (0.15 quarterly)
  1999......................................................   0.60 (0.15 quarterly)
  1998......................................................   0.60 (0.15 quarterly)




Pechiney.  The following table sets forth the amounts of dividends paid on each
Pechiney Common Share and the U.S. dollar equivalent of the amount of dividends
paid on each Pechiney ADS for each of the five fiscal years ended December 31,
2002.




                                                        EURO PER PECHINEY   U.S. DOLLARS PER
                                                          COMMON SHARE      PECHINEY ADS(1)
                                                        -----------------   ----------------
                                                                      
Year ended December 31,
  2002................................................        1.00                0.52
  2001................................................        1.00                0.45
  2000................................................        1.00                0.47
  1999................................................        0.81                0.41
  1998................................................        0.80                0.47


---------------

(1) Translations of euro amounts into U.S. dollars were made at the Federal
    Reserve Bank of New York noon buying rate on the last trading day of the
    respective years.

                                       121


                           VALIDITY OF THE SECURITIES


The validity of the Alcan Common Shares to be issued pursuant to the offer will
be passed upon by Roy Millington, Alcan's Corporate Secretary. Certain Canadian
tax consequences of the offer will be passed upon for Alcan by Hugh Berwick,
Alcan's senior tax counsel. Certain U.S. and French tax consequences of the
offer will be passed upon for Alcan by Sullivan & Cromwell LLP.


                                    EXPERTS

The consolidated financial statements incorporated into this document by
reference to Alcan's Annual Report on Form 10-K for the year ending December 31,
2002 have been so incorporated in reliance on the report of
PricewaterhouseCoopers LLP (Montreal, Canada), independent accountants, given on
the authority of said firm as experts in auditing and accounting.

The consolidated financial statements of Pechiney as of December 31, 2002 and
2001 and for each of the three years in the period ended December 31, 2002
incorporated in this prospectus by reference to Pechiney's Annual Report on Form
20-F for the year ending December 31, 2002 contain the audit report issued by
Pechiney's independent auditors. Although we have requested their consent,
Pechiney's independent auditors have not yet consented to the use of their
report in this prospectus and may not consent to such request.

                                       122


                   ADDITIONAL INFORMATION FOR SECURITYHOLDERS

                      WHERE YOU CAN FIND MORE INFORMATION

Alcan files annual, quarterly and special reports and other information with the
Securities and Exchange Commission. Pechiney files annual and special reports
and certain other information with the SEC. You may read and copy any reports,
statements or other information on file at the SEC's Public Reference Room
located at 450 Fifth Street, N.W., Washington, D.C. 20549. Please call the SEC
at 1-800-SEC-0330 for further information on the Public Reference Room. The SEC
maintains an Internet site at the URL http://www.sec.gov that contains reports,
proxy and information statements, and other information regarding issuers that
file electronically with the SEC. The Pechiney ADSs and Alcan Common Shares are
listed on the New York Stock Exchange and, consequently, the periodic reports,
proxy statements and other information filed by Pechiney and Alcan with the SEC
can be inspected at the offices of the NYSE, 20 Broad Street, New York, New York
10005.

Alcan has filed with the SEC a registration statement on Form S-4 to register
the Alcan Common Shares that holders of Pechiney securities will receive
following completion and acceptance of the offers. This prospectus does not
contain all the information set forth in the registration statement, some parts
of which are omitted in accordance with the rules and regulations of the SEC.
For further information, you should refer to the registration statement.

                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE


The SEC allows us to "incorporate by reference" information into this
prospectus, which means that we can disclose important information to you by
referring you to another document filed separately with the SEC. The information
incorporated by reference is deemed to be a part of this prospectus, except for
any information superseded by information contained in this prospectus.
Information furnished under Item 9 or Item 12 of our current reports on Form 8-K
is not incorporated by reference in this prospectus and Registration Statement.
We furnished information under Item 12 of our current reports on Form 8-K filed
on April 16, 2003 and July 22, 2003. This prospectus incorporates by reference
the documents set forth below that Alcan and Pechiney have previously filed with
the SEC. These documents contain important information about Alcan and Pechiney
and their financial condition.





ALCAN SEC FILINGS (FILE NO. 1-3677)                                PERIOD
-----------------------------------                                ------
                                             
Annual Report on Form 10-K, including:          Year ended December 31, 2002
     - those portions of Alcan's Annual
       Report for the year ended December 31,
       2002, and
     - those portions of Alcan's Management
       Proxy Circular for the annual meeting
       of shareholders held on April 24,
       2003,
that are expressly incorporated by reference
in the Annual Report on Form 10-K
Quarterly Reports on Form 10-Q                  Quarters ended March 31, 2003 and June 30,
                                                2003
Current Reports on Form 8-K                     Filed on January 21, 2003, May 2, 2003 (as
                                                amended on August 1, 2003) and July 8, 2003.






PECHINEY SEC FILINGS (FILE NO. 1-14110)                            PERIOD
---------------------------------------                            ------
                                             
Annual Report on Form 20-F                      Year ended December 31, 2002
Reports of Foreign Private Issuer on Form 6-K   Filed on April 30, 2003, July 25, 2003 and
                                                July 30, 2003.



We also incorporate by reference into this prospectus additional documents that
may be filed with the SEC by Alcan or Pechiney after the date of this prospectus
until the expiration of the U.S. offer.

                                       123


You may obtain copies of any of the documents incorporated by reference into
this prospectus through Alcan or the SEC. Alcan makes available free of charge
through its Internet site, accessible at the URL http://www.alcan.com, all of
Alcan's reports and other information filed with or furnished to the SEC by
means of a hyperlink to the SEC's EDGAR database of electronic filings. Alcan
also posts on its Internet site annual and quarterly reports filed with the SEC
as soon as reasonably practicable after the reports are electronically filed
with the SEC.


You may also obtain documents incorporated by reference into this prospectus at
no cost by requesting them in writing or by telephone at the following address:



Alcan Inc.

1188 Sherbrooke Street West
Montreal, Quebec, Canada H3A 3G2
Attn: Secretary
Tel.: 514-848-8000.

If you would like to receive documents before the expiration of the U.S. offer,
please make your request no later than       , 2003, five business days before
the expiration date of the offers.

YOU SHOULD RELY ONLY ON THE INFORMATION CONTAINED IN OR INCORPORATED BY
REFERENCE INTO THIS PROSPECTUS TO DECIDE WHETHER TO PARTICIPATE IN THE U.S.
OFFER. WE HAVE NOT AUTHORIZED ANYONE TO PROVIDE YOU WITH INFORMATION THAT IS
DIFFERENT FROM THAT WHICH IS CONTAINED IN, OR INCORPORATED BY REFERENCE INTO,
THIS PROSPECTUS. THIS PROSPECTUS IS DATED       . YOU SHOULD NOT ASSUME THAT THE
INFORMATION CONTAINED IN, OR INCORPORATED BY REFERENCE INTO, THIS PROSPECTUS IS
ACCURATE AS OF ANY DATE OTHER THAN THAT DATE, AND NEITHER THE MAILING OF THIS
PROSPECTUS TO SHAREHOLDERS NOR THE ISSUANCE OF ALCAN COMMON SHARES IN THE OFFERS
SHALL CREATE ANY IMPLICATIONS TO THE CONTRARY.

                                       124


                           EXCHANGE RATE INFORMATION

The following tables show, for the periods indicated, information concerning the
exchange rate between the U.S. dollar and the euro. The average rates presented
in these tables were calculated by using the average of the exchange rates on
the last day of each month during the relevant period. This information is
provided solely for your information, and we do not represent that euros could
be converted into U.S. dollars at these rates or at any other rate. These rates
are not the rates used by Alcan or Pechiney in the preparation of their
respective consolidated financial statements incorporated by reference into this
prospectus.


The data provided in the following table is expressed in U.S. dollars per euro
and is based on noon buying rates published by the Federal Reserve Bank of New
York for the euro. On August 26, 2003, the exchange rate between the U.S. dollar
and the euro expressed in U.S. dollar per euro was E1.00 = $1.0893. The data
provided in the following table for the period prior to January 1999 is based on
noon buying rates for the French franc converted into the euro at the fixed rate
established by the European Council of Ministers of FF 6.55957 = E1.00.





YEAR ENDED DECEMBER 31,                            HIGH     LOW     AVERAGE   PERIOD END
-----------------------                           ------   ------   -------   ----------
                                                                  
1998...........................................      N/A      N/A      N/A      1.1739
1999...........................................   1.1812   1.0016   1.0653      1.0070
2000...........................................   1.0335   0.8270   0.9232      0.9388
2001...........................................   0.9535   0.8730   0.8952      0.8901
2002...........................................   1.0485   0.8594   0.9454      1.0485
2003 (through August 26, 2003).................   1.1870   1.0361   1.1109      1.0893






MONTHS IN 2002 AND 2003                            HIGH     LOW
-----------------------                           ------   ------
                                                                  
November........................................  1.0139   0.9895
December........................................  1.0485   0.9927
January.........................................  1.0861   1.0361
February........................................  1.0875   1.7080
March...........................................  1.1062   1.0545
April...........................................  1.1180   1.0621
May.............................................  1.1853   1.1200
June............................................  1.1870   1.1423
July............................................  1.1580   1.1164
August (through August 26, 2003)................  1.1390   1.0871



                                       125


                             SERVICE OF PROCESS AND
         ENFORCEABILITY OF CIVIL LIABILITIES UNDER U.S. SECURITIES LAWS

Alcan is a Canadian corporation. Most of Alcan's directors and officers, as well
as certain experts named in this prospectus, are not citizens or residents of
the United States and all or a substantial part of the assets of these
individuals may be located outside the United States. Also, a large part of our
assets are located outside the United States. As a result, it may be difficult
for you to effect service of process within the United States upon these
individuals or to realize against them or Alcan within the United States upon
judgments of courts of the United States predicated upon civil liabilities under
the Securities Act of 1933. Roy Millington, our Corporate Secretary, has advised
us, however, that the civil liability provisions of that Act may be enforced in
original actions taken in the Province of Quebec against us or any such
individual, but judgments of United States courts predicated on such provisions
will not be enforceable in the Province of Quebec unless they meet the
requirements for the recognition and enforcement of foreign judgments under the
Civil Code of Quebec.

                       WHO CAN HELP ANSWER MY QUESTIONS?

If you have more questions about this offer, you should contact the information
agent at the address or telephone numbers set forth in the inside front cover of
this prospectus under "Information Incorporated by Reference."


Additional copies of this prospectus, the letter of transmittal and the forms of
acceptance may be obtained from the information agent, brokers, dealers,
commercial banks or trust companies.


TO OBTAIN TIMELY DELIVERY OF THESE DOCUMENTS, YOU MUST REQUEST THEM NO LATER
THAN       , 2003.

                                       126


                                  (ALCAN LOGO)

                                     ALCAN

                             The exchange agent is:


                              THE BANK OF NEW YORK




                                                                    
           BY MAIL:                        BY FACSIMILE:                  BY HAND OR OVERNIGHT COURIER:

 Tender & Exchange Department    (for eligible institutions only)          Tender & Exchange Department
           P.O. --                        (212)---                              101 Barclay Street
    Church Street Station                                                      Receive and Delivery
New York, New York 10286-1248       For confirmation telephone:              New York, New York 10286
                                          (212)---



                           The information agent is:


                             D.F. KING & CO., INC.


                                 48 Wall Street


                            New York, New York 10005


                                (212)---



                                    PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 20.  INDEMNIFICATION OF OFFICERS AND DIRECTORS.

The Canada Business Corporations Act (the "Act"), the governing act to which
Alcan Inc. (the "Corporation") is subject, provides that,

     (1) a corporation may indemnify a director or officer of the corporation, a
     former director or officer of the corporation or another individual who
     acts or acted at the corporation's request as a director or officer, or an
     individual acting in a similar capacity, of another entity, against all
     costs, charges and expenses, including an amount paid to settle an action
     or satisfy a judgment, reasonably incurred by the individual in respect of
     any civil, criminal, administrative, investigative or other proceeding in
     which the individual is involved because of that association with the
     corporation or other entity.

     (2) a corporation may advance moneys to a director, officer or other
     individual for the costs, charges and expenses of a proceeding referred to
     paragraph (1). However, the individual shall repay the moneys if he or she
     does not fulfill the conditions of paragraph (3).

     (3) a corporation may not indemnify an individual under paragraph (1)
     unless the individual

        (a) acted honestly and in good faith with a view to the best interests
        of the corporation, or, as the case may be, to the best interests of the
        other entity for which the individual acted as a director or officer or
        in a similar capacity at the corporation's request; and

        (b) in the case of a criminal or administrative action or proceeding
        that is enforced by a monetary penalty, the individual had reasonable
        grounds for believing that the individual's conduct was lawful.

     (4) A corporation may with the approval of a court indemnify a person
     referred to in paragraph (1), or advance moneys under paragraph (2), in
     respect of an action by or on behalf of the corporation or other entity to
     procure a judgment in its favor, to which the individual is made a party
     because of the individual's association with the corporation or other
     entity as described in paragraph (1) against all costs, charges and
     expenses reasonably incurred by the individual in connection with such
     action if the individual fulfils the conditions set out in paragraph (3).

     (5) Despite paragraph (1), an individual referred to in paragraph (1) is
     entitled to indemnity from the corporation in respect of all costs, charges
     and expenses reasonably incurred by the individual in connection with the
     defense of any civil, criminal, administrative, investigative or other
     proceeding to which the individual is subject because of the individual's
     association with the corporation or other entity as described in paragraph
     (1), if the individual seeking indemnity:

        (a) was not judged by the court or other competent authority to have
        committed any fault or omitted to do anything that the individual ought
        to have done; and

        (b) fulfils the conditions set out in paragraph (3).

The Directors' Standing Resolution pertaining to indemnification of Directors
and Officers of the Corporation represents, in general terms, the extent to
which directors and officers may be indemnified by the Corporation under the
Act. This resolution provides as follows:

"17.  INDEMNITY (1) Subject to the limitations contained in the governing Act
but without limit to the right of the Corporation to indemnify as provided for
in the Act, the Corporation shall indemnify a Director or Officer, a former
Director or Officer, or a person who acts or acted at the Corporation's request
as a Director or Officer of a body corporate of which the Corporation is or was
a Shareholder or creditor (or a person who undertakes or has undertaken any
liability on behalf of the Corporation or at the Corporation's request on behalf
of any such body corporate) and his heirs and legal representatives, against all
costs, charges and expenses, including an amount paid to settle an action or
satisfy a judgment, reasonably incurred by him in respect of any civil,
criminal, administrative, investigative or other proceeding to which he is made
a party by

                                       II-1


reason of being or having been a Director or Officer of the Corporation or such
body corporate or by reason of having undertaken such liability.

(2) ADVANCE OF COSTS -- The Corporation shall advance moneys to a Director,
Officer or other individual for the costs, charges and expenses of a proceeding
referred to in subsection (1). The individual shall repay the moneys if the
individual does not fulfill the conditions of subsection (3).

(3) LIMITATION -- The Corporation may not indemnify an individual under
subsection (1) unless the individual

     (a) acted honestly and in good faith with a view to the best interests of
     the Corporation; and

     (b) in the case of a criminal or administrative action or proceeding that
     is enforced by a monetary penalty, he had reasonable grounds for believing
     that his conduct was lawful."

The Corporation also has an insurance policy covering Directors and Officers of
the Corporation and of its subsidiaries against certain liabilities which might
be incurred by them in their capacities as such, but excluding those claims for
which such insured persons could be indemnified by the Corporation or its
subsidiaries.

ITEM 21.  EXHIBITS AND FINANCIAL STATEMENTS AND SCHEDULES.

(a) The following Exhibits are filed herewith unless otherwise indicated:

                                 EXHIBIT INDEX




                                                                        PAGINATION BY
                                                                         SEQUENTIAL
EXHIBIT                                                                   NUMBERING
NUMBER                            DESCRIPTION                              SYSTEM
-------                           -----------                           -------------
                                                                  
  3.1     Restated Articles of Incorporation, dated as of September
          12, 2002 (incorporated herein by reference to Exhibit 3 to
          the Quarterly Report on Form 10-Q of Alcan for the quarter
          ended September 30, 2002 (File No. 1-3677)).................
  3.2     By-law No. 1A (incorporated herein by reference to Exhibit
          3.5 to the Annual Report on Form 10-K of Alcan for the
          fiscal year ended December 31, 1987 (File No. 1-3677))......
  4       Shareholder Rights Agreement, dated as of December 14, 1989,
          as amended and restated as of April 22, 1999, between Alcan
          Aluminum Limited and CIBC Mellon Trust Company, as rights
          agent (incorporated herein by reference to Schedule B of the
          Management Proxy Circular filed as Exhibit 99 to the Annual
          Report on Form 10-K for the fiscal year ended December 31,
          1998 (File No. 1-3677)).....................................
  5       Form of Opinion of Roy Millington regarding validity of
          securities being
          registered..................................................
  8.1     Form of Opinion of Sullivan & Cromwell LLP regarding United
          States and French tax consequences of the offer.............
  8.2     Form of Opinion of Hugh Berwick regarding Canadian tax
          consequences of the offer...................................
 21       List of Subsidiaries of Alcan (incorporated herein by
          reference to Exhibit 21 to the Annual Report on Form 10-K
          for the fiscal year ended December 31, 2002 (File No.
          1-3677))....................................................
 23.1     Consent of PricewaterhouseCoopers LLP as auditors of the
          financial statements of Alcan**.............................
 23.2     Consent of Roy Millington (included in the opinion filed as
          Exhibit 5 to this registration statement)...................
 23.3     Consent of Sullivan & Cromwell LLP (included in the opinion
          filed as Exhibit 8.1 to this registration statement)........
 23.4     Consent of Hugh Berwick (included in the opinion filed as
          Exhibit 8.2 to this registration statement).................



                                       II-2





                                                                        PAGINATION BY
                                                                         SEQUENTIAL
EXHIBIT                                                                   NUMBERING
NUMBER                            DESCRIPTION                              SYSTEM
-------                           -----------                           -------------
                                                                  
 24.1     Powers of Attorney of Directors of Alcan Inc. signing by an
          attorney-in-fact*...........................................
 24.2     Power of Attorney of the authorized representative in the
          United States of America of Alcan Inc. signing by an
          attorney-in-fact*...........................................
 99.1     Form of Letter of Transmittal (Pechiney ADSs).**............
 99.2     Form of Notice of Guaranteed Delivery (Pechiney ADSs).**....
 99.3     Form of Letter to Brokers, Dealers, Commercial Banks, Trust
          Companies and Other Nominees (Pechiney ADSs).**.............
 99.4     Form of Letter to Clients for Use by Brokers, Dealers,
          Commercial Banks, Trust Companies and Other Nominees
          (Pechiney ADSs).**..........................................
 99.5     Guidelines for Certification of Taxpayer Identification
          Number on Substitute Form W-9.**............................
 99.6     Form of Form of Acceptance for Pechiney Common Shares.**....
 99.7     Form of Form of Acceptance for Pechiney Bonus Allocation
          Rights.**...................................................
 99.8     Form of Form of Acceptance for Pechiney OCEANEs.**..........
 99.9     Technical Notice to French Financial Intermediaries and U.S.
          Custodians (Pechiney Common Shares, Pechiney Bonus
          Allocation Rights and Pechiney OCEANEs).**..................
 99.10    Form of Letter to Clients for Use by Brokers, Dealers,
          Commercial Banks, Trust Companies and Other Nominees
          (Pechiney Common Shares, Pechiney Bonus Allocation Rights
          and Pechiney OCEANEs).**....................................



---------------


  * Previously filed.



 ** To be filed by amendment.


(b) Financial Statement Schedules

Not Applicable.

ITEM 22.  UNDERTAKINGS.

(a) The undersigned registrant hereby undertakes:

     (1) To file, during any period in which offers or sales are being made, a
         post-effective amendment to this registration statement:

        (i)  To include any prospectus required by Section 10(a)(3) of the
             Securities Act of 1933, as amended;

        (ii)  To reflect in the prospectus any facts or events arising after the
              effective date of registration statement (or the most recent
              post-effective amendment thereof) which, individually or in the
              aggregate, represent a fundamental change in the information set
              forth in the registration statement. Notwithstanding the
              foregoing, any increase or decrease in volume of securities
              offered (if the total U.S. dollar value of securities offered
              would not exceed that which was registered) and any derivation
              from the low or high end of the estimated maximum offering range
              may be reflected in the form of prospectus filed with the SEC
              pursuant to Rule 424(b) if, in the aggregate, the changes in
              volume and price represent no more than a 20 percent change in the
              maximum aggregate offering price set forth in the "Calculation of
              Registration Fee" table in the effective registration statement;

        (iii) To include any material information with respect to the plan of
              distribution not previously disclosed in the registration
              statement or any material change to such information in the
              registration statement.

                                       II-3


     (2) That, for the purpose of determining any liability under the Securities
         Act of 1933, as amended, each such post-effective amendment shall be
         deemed to be a new registration statement relating to the securities
         offered therein, and the offering of such securities at that time shall
         be deemed to be the initial bona fide offering thereof.

     (3) To remove from registration by means of a post-effective amendment any
         of the securities being registered which remain unsold at the
         termination of the offering.

     (4) That prior to any public reoffering of the securities registered
         hereunder through use of a prospectus which is a part of this
         registration statement, by any person or party who is deemed to be an
         underwriter within the meaning of Rule 145(c), such reoffering
         prospectus will contain the information called for by the applicable
         registration form with respect to reofferings by persons who may be
         deemed underwriters, in addition to the information called for by the
         other items of the applicable form.

     (5) That every prospectus (i) that is filed pursuant to paragraph (4)
         immediately preceding, or (ii) that purports to meet the requirements
         of Section 10(a)(3) of the Securities Act of 1933, as amended, and is
         used in connection with an offering of securities subject to Rule 415,
         will be filed as a part of an amendment to the registration statement
         and will not be used until such amendment is effective, and that, for
         purposes of determining any liability under the Securities Act of 1933,
         each such post-effective amendment shall be deemed to be a new
         registration statement relating to the securities offered therein, and
         the offering of such securities at that time shall be deemed to be the
         initial bona fide offering thereof.

     (6) That, for the purposes of determining any liability under the
         Securities Act of 1933, as amended, each filing of the registrant's
         annual report pursuant to Section 13(a) or 15(d) of the Securities
         Exchange Act of 1934 (and, where applicable, each filing of an employee
         benefit plan's annual report pursuant to Section 15(d) of the
         Securities Exchange Act of 1934) that is incorporated by reference in
         the registration statement shall be deemed to be a new registration
         statement relating to the securities offered therein, and the offering
         of such securities at that time shall be deemed to be the initial bona
         fide offering thereof.

     (7) To respond to requests for information that is incorporated by
         reference into the prospectus pursuant to Item 4, 10(b), 11 or 13 of
         this form, within one business day of receipt of such request, and to
         send the incorporated documents by first class mail or other equally
         prompt means. This includes information contained in documents filed
         subsequent to the effective date of the registration statement through
         the date of responding to the request.

     (8) To supply by means of a post-effective amendment all information
         concerning a transaction, and the company being acquired involved
         therein, that was not the subject of and included in the registration
         statement when it became effective.

(b) Insofar as indemnification for liabilities arising under the Securities Act
    of 1933, as amended, may be permitted to directors, officers and controlling
    persons of the registrant pursuant to the foregoing provisions, or
    otherwise, the registrant has been advised that in the opinion of the SEC
    such indemnification is against public policy as expressed in the Act and
    is, therefore, unenforceable. In the event that a claim for indemnification
    against such liabilities (other than the payment by the registrant of
    expenses incurred or paid by a director, officer or controlling person of
    the registrant in the successful defense of any action, suit or proceeding)
    is asserted by such director, officer or controlling person in connection
    with the securities being registered, the registrant will, unless in the
    opinion of its counsel the matter has been settled by controlling precedent,
    submit to a court of appropriate jurisdiction the question whether such
    indemnification by it is against public policy as expressed in the Act and
    will be governed by the final adjudication of such issue.

                                       II-4


                                   SIGNATURES


Pursuant to the requirements of the Securities Act of 1933, as amended, the
registrant has duly caused this registration statement to be signed on its
behalf by the undersigned, thereunto duly authorized, in Montreal, Canada, on
August 28, 2003.



                                          Alcan Inc.


                                          By: /s/ TRAVIS ENGEN
                                            ------------------------------------
                                          Name: Travis Engen
                                          Title: President and Chief Executive
                                          Office


Pursuant to the requirements of the Securities Act of 1933, as amended, this
registration statement has been signed below by the following persons in the
capacities indicated on August 28, 2003:





                    SIGNATURE                                      TITLE                      DATE
                    ---------                                      -----                      ----
                                                                                

                 /s/ TRAVIS ENGEN                    President, Chief Executive Office   August 28, 2003
 ------------------------------------------------    and Director (Principal Executive
                   Travis Engen                                  Officer)


                        *                                        Director                August 28, 2003
 ------------------------------------------------
                  Roland Berger


                        *                                        Director                August 28, 2003
 ------------------------------------------------
               Clarence J. Chandran


                        *                                        Director                August 28, 2003
 ------------------------------------------------
                L. Denis Desautels


                        *                                Chairman of the Board of        August 28, 2003
 ------------------------------------------------                Directors
                 L. Yves Fortier


                        *                                        Director                August 28, 2003
 ------------------------------------------------
              William R. Loomis, Jr.


                        *                                        Director                August 28, 2003
 ------------------------------------------------
                   J.E. Newall


                        *                                        Director                August 28, 2003
 ------------------------------------------------
                 Guy Saint-Pierre


                        *                                        Director                August 28, 2003
 ------------------------------------------------
                Gerhard Schulmeyer


                        *                                        Director                August 28, 2003
 ------------------------------------------------
                 Paul M. Tellier


                                                                 Director
 ------------------------------------------------
                  Milton K. Wong



                                       II-5





                    SIGNATURE                                      TITLE                      DATE
                    ---------                                      -----                      ----

                                                                                

             /s/ GEOFFERY E. MERSZEI                   Executive Vice President and      August 28, 2003
 ------------------------------------------------         Chief Financial Officer
               Geoffery E. Merszei                     (Principal Financial Officer)


             /s/ THOMAS J. HARRINGTON                  Vice President and Controller     August 28, 2003
 ------------------------------------------------     (Principal Accounting Officer)
               Thomas J. Harrington


                        *                            Authorized Representative in the    August 28, 2003
 ------------------------------------------------        United States of America
               William H. Jairrels


 *By:               /s/ ROY MILLINGTON                                                   August 28, 2003
        ------------------------------------------
            Roy Millington as Attorney-in-fact



                                       II-6


                                 EXHIBIT INDEX




                                                                         PAGINATION BY
                                                                          SEQUENTIAL
EXHIBIT                                                                    NUMBERING
NUMBER                            DESCRIPTION                               SYSTEM
-------                           -----------                            -------------
                                                                   
     3.1  Restated Articles of Incorporation, dated as of September
          12, 2002 (incorporated herein by reference to Exhibit 3 to
          the Quarterly Report on Form 10-Q of Alcan for the quarter
          ended September 30, 2002 (File No. 1-3677)).................
     3.2  By-law No. 1A (incorporated herein by reference to Exhibit
          3.5 to the Annual Report on Form 10-K of Alcan for the
          fiscal year ended December 31, 1987 (File No. 1-3677))......
     4    Shareholder Rights Agreement, dated as of December 14, 1989,
          as amended and restated as of April 22, 1999, between Alcan
          Aluminum Limited and CIBC Mellon Trust Company, as rights
          agent (incorporated herein by reference to Schedule B of the
          Management Proxy Circular filed as Exhibit 99 to the Annual
          Report on Form 10-K for the fiscal year ended December 31,
          1998 (File No. 1-3677)).....................................
     5    Form of Opinion of Roy Millington regarding validity of
          securities being registered.................................
     8.1  Form of Opinion of Sullivan & Cromwell LLP regarding United
          States and French tax consequences of the offer.............
     8.2  Form of Opinion of Hugh Berwick regarding Canadian tax
          consequences of the offer...................................
    21    List of Subsidiaries of Alcan (incorporated herein by
          reference to Exhibit 21 to the Annual Report on Form 10-K
          for the fiscal year ended December 31, 2002 (File No.
          1-3677))....................................................
    23.1  Consent of PricewaterhouseCoopers LLP as auditors of the
          financial statements of Alcan**.............................
    23.2  Consent of Roy Millington (included in the opinion filed as
          Exhibit 5 to this registration statement)...................
    23.3  Consent of Sullivan & Cromwell LLP (included in the opinion
          filed as Exhibit 8.1 to this registration statement)........
    23.4  Consent of Hugh Berwick (included in the opinion filed as
          Exhibit 8.2 to this registration statement).................
    24.1  Powers of Attorney of Directors of Alcan Inc. signing by an
          attorney-in-fact*...........................................
    24.2  Power of Attorney of the authorized representative in the
          United States of America of Alcan Inc. signing by an
          attorney-in-fact*...........................................
    99.1  Form of Letter of Transmittal (Pechiney ADSs).**............
    99.2  Form of Notice of Guaranteed Delivery (Pechiney ADSs).**....
    99.3  Form of Letter to Brokers, Dealers, Commercial Banks, Trust
          Companies and Other Nominees (Pechiney ADSs).**.............
    99.4  Form of Letter to Clients for Use by Brokers, Dealers,
          Commercial Banks, Trust Companies and Other Nominees
          (Pechiney ADSs).**..........................................
    99.5  Guidelines for Certification of Taxpayer Identification
          Number on Substitute Form W-9.**............................
    99.6  Form of Form of Acceptance for Pechiney Common Shares.**....
    99.7  Form of Form of Acceptance for Pechiney Bonus Allocation
          Rights.**...................................................



                                       E-1





                                                                         PAGINATION BY
                                                                          SEQUENTIAL
EXHIBIT                                                                    NUMBERING
NUMBER                            DESCRIPTION                               SYSTEM
-------                           -----------                            -------------
                                                                   
    99.8  Form of Form of Acceptance for Pechiney OCEANEs.**..........
    99.9  Technical Notice to French Intermediaries and U.S.
          Custodians (Pechiney Common Shares, Pechiney Bonus
          Allocation Rights and Pechiney OCEANEs).**..................
    99.10 Form of Letter to Clients for Use by Brokers, Dealers,
          Commercial Banks, Trust Companies and Other Nominees
          (Pechiney Common Shares, Pechiney Bonus Allocation Rights
          and Pechiney OCEANEs).**....................................



---------------


  * Previously filed.



 ** To be filed by amendment.


                                       E-2