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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

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Form 10-K

Commission file number 1-8787

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American International Group, Inc.
(Exact name of registrant as specified in its charter)

Registrant's telephone number, including area code (212) 770-7000

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Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act: None

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     Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes þ    No o

     Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes o    No þ

     Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes þ    No o

     Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes þ    No o

     Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. o

     Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of "large accelerated filer," "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

     Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes o    No þ

     The aggregate market value of the voting and nonvoting common equity held by nonaffiliates of the registrant computed by reference to the price at which the common equity was last sold of $23.20 as of June 30, 2009 (the last business day of the registrant's most recently completed second fiscal quarter), was approximately $2,794,000,000.

     As of January 29, 2010, there were outstanding 134,926,293 shares of Common Stock, $2.50 par value per share, of the registrant.

DOCUMENTS INCORPORATED BY REFERENCE

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American International Group, Inc., and Subsidiaries

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AIG 2009 Form 10-K            2

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American International Group, Inc., and Subsidiaries

Part I

Item 1.    Business

    American International Group, Inc. (AIG), a Delaware corporation, is a holding company which, through its subsidiaries, is engaged primarily in a broad range of insurance and insurance-related activities in the United States and abroad.

    Since September 2008, AIG has been working to protect and enhance the value of its key businesses, execute an orderly asset disposition plan, and position itself for the future. AIG has entered into several important transactions and relationships with the Federal Reserve Bank of New York (FRBNY), the AIG Credit Facility Trust (together with its trustees, acting in their capacity as trustees, the Trust) and the United States Department of the Treasury (the Department of the Treasury). As a result of these arrangements, AIG is controlled by the Trust, which was established for the sole benefit of the United States Treasury.

    AIG's four reportable segments are as follows:

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General Insurance;



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Domestic Life Insurance & Retirement Services;



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Foreign Life Insurance & Retirement Services; and



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Financial Services.

    The principal business units in each of AIG's reportable segments at year-end 2009 are shown below. For information on AIG's reportable segments, including geographic areas of operation, and changes made in 2009, see Note 4 to the Consolidated Financial Statements.

3            AIG 2009 Form 10-K

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American International Group, Inc., and Subsidiaries

    Throughout this Annual Report on Form 10-K, AIG presents its operations in the way it believes will be most meaningful, as well as most transparent. Certain of the measurements used by AIG management are "non-GAAP financial measures" under SEC rules and regulations. Underwriting profit (loss) is utilized to report results for AIG's General Insurance operations. Pre-tax income (loss) before net realized capital gains (losses) is utilized to report results for AIG's life insurance and retirement services operations. For an explanation of why AIG management considers these "non-GAAP measures" useful to investors, see Management's Discussion and Analysis of Financial Condition and Results of Operations.

    Following is additional information about AIG's operations:

General Insurance Operations

    AIG's General Insurance subsidiaries are multiple line companies writing substantially all lines of property and casualty insurance both domestically and abroad and comprise the Commercial Insurance and the Foreign General Insurance operating segments. In July 2009, AIG's General Insurance subsidiaries were rebranded as Chartis (Commercial Insurance operates as Chartis U.S. and Foreign General Insurance operates as Chartis International). Chartis Private Client Group (Private Client Group) is part of Chartis U.S.

    AIG is diversified both in terms of classes of business and geographic locations. In General Insurance, general and auto liability business is the largest class of business written and represented approximately 15 percent of net premiums written for the year ended December 31, 2009. During 2009, 8 percent, 6 percent and 6 percent of the direct General Insurance premiums written (gross premiums less return premiums and cancellations, excluding reinsurance assumed and before deducting reinsurance ceded) were written in the states of California, New York and Texas, respectively, and 11 percent and 9 percent were written in Japan and the United Kingdom, respectively. No other state or foreign country accounted for more than five percent of such premiums.

    The majority of AIG's General Insurance business is in the casualty classes, which tend to involve longer periods of time for the reporting and settling of claims. This may increase the risk and uncertainty with respect to AIG's loss reserve development.

Commercial Insurance

    Commercial Insurance's business in the United States and Canada is conducted through American Home, National Union, Lexington and certain other General Insurance company subsidiaries of AIG.

    Chartis U.S. writes substantially all classes of business insurance, accepting such business mainly from insurance brokers. This provides Chartis U.S. the opportunity to select specialized markets and retain underwriting control. Any licensed broker is able to submit business to Chartis U.S. without the traditional agent-company contractual relationship, but such broker usually has no authority to commit Chartis U.S. to accept a risk.

    In addition to writing substantially all classes of business insurance, including large commercial or industrial property insurance, excess liability, inland marine, environmental, workers' compensation and excess and umbrella

AIG 2009 Form 10-K            4

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American International Group, Inc., and Subsidiaries

coverages, Chartis U.S. offers many specialized forms of insurance such as aviation, accident and health, equipment breakdown, directors and officers liability (D&O), difference-in-conditions, kidnap-ransom, export credit and political risk, and various types of professional errors and omissions coverages. Also included in Chartis U.S. are the operations of Commercial Casualty, which provides insurance and risk management programs for large corporate customers and is a leading provider of customized structured insurance products, and Chartis Environmental, which focuses on providing specialty products to clients with environmental exposures. Lexington writes surplus lines for risks on which conventional insurance companies do not readily provide insurance coverage, either because of complexity or because the coverage does not lend itself to conventional contracts. The Chartis Worldsource Division introduces and coordinates AIG's products and services to U.S.-based multinational clients and foreign corporations doing business in the U.S. Private Client Group provides a broad range of coverages for high net worth individuals.

Foreign General Insurance

    Chartis International writes both commercial and consumer lines of insurance through a network of agencies, branches and foreign-based insurance subsidiaries. Chartis International uses various marketing methods and multiple distribution channels to write both commercial and consumer lines of insurance with certain refinements for local laws, customs and needs. Chartis International operates in Asia, the Pacific Rim, Europe, the U.K., Africa, the Middle East and Latin America.

Discussion and Analysis of Consolidated Net Losses and Loss Expense Reserve Development

    The reserve for net losses and loss expenses represents the accumulation of estimates for reported losses (case basis reserves) and provisions for losses incurred but not reported (IBNR), both reduced by applicable reinsurance recoverable and the discount for future investment income, where permitted. Net losses and loss expenses are charged to income as incurred.

    The Liability for unpaid claims and claims adjustment expense (loss reserves) established with respect to foreign business is set and monitored in terms of the currency in which payment is expected to be made. Therefore, no assumption is included for changes in currency rates. See also Note 1(v) to the Consolidated Financial Statements.

    Management reviews the adequacy of established loss reserves utilizing a number of analytical reserve development techniques. Through the use of these techniques, management is able to monitor the adequacy of AIG's established reserves and determine appropriate assumptions for inflation. Also, analysis of emerging specific development patterns, such as case reserve redundancies or deficiencies and IBNR emergence, allows management to determine any required adjustments.

    The "Analysis of Consolidated Losses and Loss Expense Reserve Development" table presents the development of net losses and loss expense reserves for calendar years 1999 through 2009. Immediately following this table is a second table that presents all data on a basis that excludes asbestos and environmental net losses and loss expense reserve development. The opening reserves held are shown at the top of the table for each year-end date. The amount of loss reserve discount included in the opening reserve at each date is shown immediately below the reserves held for each year. The undiscounted reserve at each date is thus the sum of the discount and the reserve held.

    The upper half of the table presents the cumulative amounts paid during successive years related to the undiscounted opening loss reserves. For example, in the table that excludes asbestos and environmental losses, with respect to the net losses and loss expense reserve of $28.65 billion at December 31, 2002, by the end of 2009 (seven years later) $39.64 billion had actually been paid in settlement of these net loss reserves. In addition, as reflected in the lower section of the table, the original undiscounted reserve of $30.15 billion was reestimated to be $50.79 billion at December 31, 2009. This increase from the original estimate generally results from a combination of a number of factors, including claims being settled for larger amounts than originally estimated. The original estimates will also be increased or decreased as more information becomes known about the individual claims and overall claim frequency and severity patterns. The redundancy (deficiency) depicted in the table, for any particular calendar year, presents the aggregate change in estimates over the period of years subsequent to the calendar year reflected at the top of the respective column heading. For example, the deficiency of $2.62 billion at December 31, 2009 related to December 31, 2008 net losses and loss expense reserves of $73.64 billion represents the cumulative amount by which reserves in 2008 and prior years have developed unfavorably during 2009.

5            AIG 2009 Form 10-K

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    The bottom of each table below presents the remaining undiscounted and discounted net loss reserve for each year. For example, in the table that excludes asbestos and environmental losses, for the 2001 year-end, the remaining undiscounted reserves held at December 31, 2009 are $9.71 billion, with a corresponding discounted net reserve of $8.98 billion.

Analysis of Consolidated Losses and Loss Expense Reserve Development

The following table presents for each calendar year the losses and loss expense reserves and the development thereof including those with respect to asbestos and environmental claims. See also Management's Discussion and Analysis of Financial Condition and Results of Operations — Results of Operations — Segment Results — General Insurance Operations — Liability for unpaid claims and claims adjustment expense.*

 

AIG 2009 Form 10-K            6

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*

During 2009, Transatlantic Holdings, Inc. (Transatlantic) was deconsolidated and 21st Century Insurance Group and Agency Auto Division (excluding AIG Private Client Group) (21st Century) and HSB Group, Inc. (HSB) were sold. Immediately preceding these sales, the loss and loss expense reserves for these entities totaled $9.7 billion. As a result of the sales and deconsolidation, these obligations ceased being the responsibility of AIG. The sales and deconsolidation are reflected in the table above as a reduction in December 31, 2009 net reserves of $9.7 billion and as a $8.6 billion increase in paid losses for the years 1999 through 2008 to reflect no impact on incurred losses for these periods.

(a)

Includes real estate investments and collateral assets invested under the securities lending program.

(b)

Net investment income divided by the annual average investments.