UNITED STATES 
SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 
 
FORM N-Q 
 
QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED 
MANAGEMENT INVESTMENT COMPANIES 
 
Investment Company Act file number 811- 21287 
 
John Hancock Preferred Income Fund III 
(Exact name of registrant as specified in charter) 
 
601 Congress Street, Boston, Massachusetts 02210 
(Address of principal executive offices) (Zip code) 
 
Salvatore Schiavone, Treasurer 
 
601 Congress Street 
 
Boston, Massachusetts  02210 
 
(Name and address of agent for service) 
 
Registrant's telephone number, including area code: 617-663-4497 
 
Date of fiscal year end:  July 31 
 
 
Date of reporting period:  October 31, 2009 



ITEM 1. SCHEDULE OF INVESTMENTS






John Hancock Preferred Income Fund III
Securities owned by the Fund on
October 31, 2009 (Unaudited)

    Maturity     
  Rate  date  Par value  Value 
 
Corporate Bonds 13.26%        $59,849,683 
(Cost $70,094,763)         
 
Energy 2.34%        10,578,000 
 
Oil, Gas & Consumable Fuels 2.34 %         
Southern Union Co.,         
   Jr Sub Note, Ser A (7.200% to 11-01-11 then variable - LIBOR +30) (Z)  7.200%  11/01/66  12,900,000  10,578,000 
 
Financials 4.21%        19,000,000 
 
Commercial Banks 4.21 %         
Lloyds TSB Bank PLC,         
   Sub Note   6.900  11/22/49  25,000,000  19,000,000 
 
Utilities 6.71%        30,271,683 
 
Electric Utilities 5.29 %         
DPL Capital Trust II,         
   Gtd Sub Bond (Z)   8.125  09/01/31  6,225,000  5,960,599 
Entergy Gulf States, Inc.,         
   1st Mtg Bond (Z)   6.200  07/01/33  15,000,000  14,653,230 
Kentucky Power Co.,         
   Sr Note, Ser D (Z)   5.625  12/01/32  3,565,000  3,279,802 
 
Multi-Utilities 1.42 %         
Dominion Resources Capital Trust I,         
   Gtd Jr Sub Bond (Z)   7.830  12/01/27  6,364,000  6,378,052 
 
      Shares  Value 
 
Common Stocks 0.65%        $2,959,000 
(Cost $3,031,508)         
 
Telecommunication Services 0.65%        2,959,000 
 
Diversified Telecommunication Services 0.65 %         
Verizon Communications, Inc.      100,000  2,959,000 
 
 
 
      Shares  Value 
 
Preferred Stocks 137.85%        $622,326,236 
(Cost $751,741,210)         
 
Consumer Discretionary 11.38%        51,355,820 
 
Media 11.38 %         
CBS Corp., 7.250%      150,000  3,225,000 
Comcast Corp., 6.625% (Z)      130,000  2,983,500 
Comcast Corp., 7.000% (Z)      114,900  2,798,964 
Comcast Corp., 7.000%, Ser B (Z)      609,556  14,897,549 
Viacom, Inc., 6.850% (Z)      1,196,635  27,450,807 
 
Consumer Staples 2.74%        12,382,500 
 
Food & Staples Retailing 2.74 %         
Ocean Spray Cranberries, Inc., 6.250%, Ser A (S)(Z)      195,000  12,382,500 

Page 1 



John Hancock Preferred Income Fund III
Securities owned by the Fund on
October 31, 2009 (Unaudited)

      Shares  Value 
 
Energy 8.24%        37,176,047 
 
Oil, Gas & Consumable Fuels 8.24 %       
Nexen, Inc., 7.350% (Z)      1,590,079  37,176,047 
 
Financials 74.54%        336,513,555 
 
Capital Markets 10.36 %         
Credit Suisse Guernsey, 7.900%    170,000  4,207,500 
Lehman Brothers Holdings Capital Trust III, 6.375%, Ser K (I)  808,400  307,192 
Lehman Brothers Holdings, Inc., 5.670%, Depositary Shares, Ser D (I)  142,601  44,206 
Merrill Lynch Preferred Capital Trust III, 7.000% (Z)  457,017  8,779,297 
Merrill Lynch Preferred Capital Trust IV, 7.120% (Z)  380,700  7,431,264 
Merrill Lynch Preferred Capital Trust V, 7.280% (Z)  408,700  8,227,131 
Morgan Stanley Capital Trust III, 6.250%    166,000  3,504,260 
Morgan Stanley Capital Trust IV, 6.250% (Z)    620,000  12,827,800 
Morgan Stanley Capital Trust V, 5.750%    75,100  1,464,450 
 
Commercial Banks 20.14 %       
Barclays Bank PLC, 7.100%, Ser 3 (Z)    330,000  7,075,200 
Barclays Bank PLC, 8.125%, Ser 5    245,000  5,769,750 
CA Preferred Funding Trust, 7.000%    9,000,000  7,920,000 
PFGI Capital Corp., 7.750% (Z)    926,900  22,695,686 
Royal Bank of Scotland Group PLC, 5.750%, Ser L (Z)  960,000  10,761,600 
Royal Bank of Scotland Group PLC, 7.250%, Ser T (Z)  40,000  469,600 
Santander Finance Preferred SA, 10.500%    145,000  3,967,200 
Sovereign Bancorp, Inc., 7.300%, Depositary Shares, Ser C (Z)  479,910  12,045,741 
USB Capital VIII, 6.350%, Ser 1 (Z)    467,000  10,185,270 
USB Capital XI, 6.600%      40,000  904,800 
Wells Fargo & Co., 8.000% (Z)    296,500  7,249,425 
Wells Fargo Capital Trust IV, 7.000% (Z)    77,800  1,876,536 
 
Consumer Finance 4.61 %         
HSBC Finance Corp., 6.360%, Depositary Shares, Ser B (Z)  270,000  5,157,000 
HSBC Finance Corp., 6.875% (Z)    576,118  13,533,012 
SLM Corp., 6.000% (Z)      41,840  650,194 
SLM Corp., 6.970%, Ser A (Z)    44,899  1,468,197 
 
Diversified Financial Services 20.10 %       
Bank of America Corp. Capital Trust II, 7.000% (Z)  94,600  1,925,110 
CIT Group, Inc., 6.350%, Ser A (Z)    150,000  78,000 
Citigroup Capital X, 6.100%    725,000  12,274,250 
Deutsche Bank Capital Funding Trust X, 7.350%    200,000  4,512,000 
Deutsche Bank Contingent Capital Trust II, 6.550%  351,200  7,167,992 
Deutsche Bank Contingent Capital Trust III, 7.600%  240,000  5,534,400 
General Electric Capital Corp., 6.000%    85,000  1,972,850 
General Electric Capital Corp., 6.050%    50,000  1,192,500 
General Electric Capital Corp., 6.625%    26,000  632,320 
ING Groep NV, 7.050% (Z)    598,970  10,272,336 
ING Groep NV, 7.200% (Z)    765,000  13,578,750 
JPMorgan Chase & Co., 5.720%, Ser F    66,000  2,993,100 
JPMorgan Chase & Co., 6.150%, Ser E    151,500  7,134,135 
JPMorgan Chase & Co., 8.625%    395,000  10,514,900 
RBS Capital Funding Trust V, 5.900% (Z)    755,000  7,421,650 
RBS Capital Funding Trust VI, 6.250% (Z)    344,000  3,519,120 

Page 2 



John Hancock Preferred Income Fund III
Securities owned by the Fund on
October 31, 2009 (Unaudited)

    Shares  Value 
 
Financials (continued)         
 
Insurance 12.54 %       
Aegon NV, 6.375% (Z)    245,000  4,067,000 
Aegon NV, 6.500% (Z)    215,000  3,491,600 
Lincoln National Capital VI, 6.750%, Ser F (Z)  271,500  5,554,890 
MetLife, Inc., 6.500%, Ser B (Z)  965,000  20,969,450 
Phoenix Cos., Inc., 7.450% (Z)  600,549  10,821,893 
PLC Capital Trust IV, 7.250% (Z)  217,100  4,539,561 
PLC Capital Trust V, 6.125% (Z)  145,000  2,570,850 
Prudential PLC, 6.500% (Z)    110,000  2,299,000 
RenaissanceRe Holdings Ltd., 6.080%, Ser C (Z)  122,300  2,289,456 
 
Real Estate Investment Trusts 6.77 %     
Duke Realty Corp., 6.500%, Depositary Shares, Ser K (Z)  151,600  2,683,320 
Duke Realty Corp., 6.600%, Depositary Shares, Ser L (Z)  118,500  2,133,000 
Duke Realty Corp., 6.625%, Depositary Shares, Ser J (Z)  638,100  11,364,561 
Wachovia Preferred Funding Corp., 7.250%, Ser A (Z)  725,000  14,391,250 
 
Thrifts & Mortgage Finance 0.02 %     
Federal National Mortgage Assn. (8.250% to 12-13-10, then     
   variable) (I)    80,000  92,000 
 
Telecommunication Services 6.97%    31,472,732 
 
Wireless Telecommunication Services 6.97 %     
Telephone & Data Systems, Inc., 7.600%, Ser A (Z)  623,743  14,302,427 
United States Cellular Corp., 7.500% (Z)  729,100  17,170,305 
 
Utilities 33.98%        153,425,582 
 
Electric Utilities 20.36 %       
Entergy Mississippi, Inc., 7.250%  13,000  328,250 
Entergy Texas, Inc., 7.875%    42,500  1,145,375 
FPC Capital I, 7.100%, Ser A (Z)  805,500  20,137,500 
FPL Group Capital, Inc., 7.450%, Ser E (Z)  20,000  524,800 
FPL Group Capital Trust I, 5.875% (Z)  268,000  6,748,240 
Georgia Power Co., 6.000%, Ser R (Z)  702,000  17,683,380 
HECO Capital Trust III, 6.500% (Z)  157,955  3,711,943 
Interstate Power & Light Co., 8.375%, Ser B  211,700  5,874,675 
PPL Electric Utilities Corp., 6.250%, Depositary Shares (Z)  189,000  4,394,250 
PPL Energy Supply, LLC, 7.000% (Z)  846,450  21,719,907 
Southern California Edison Co., 6.000%, Ser C (Z)  50,000  4,223,440 
Southern California Edison Co., 6.125% (Z)  20,000  1,751,250 
Westar Energy, Inc., 6.100% (Z)  152,000  3,678,400 
 
Gas Utilities 4.66 %       
Southwest Gas Capital II, 7.700% (Z)  846,500  21,052,455 
 
Independent Power Producers & Energy Traders 0.88 %     
Constellation Energy Group, Inc., 8.625%, Ser A (Z)  160,000  3,963,200 
 
Multi-Utilities 8.08 %       
BGE Capital Trust II, 6.200% (Z)  622,500  13,383,750 
Consolidated Edison Co. of NY, Inc., 5.000%, Ser A (Z)  19,000  1,700,500 
Dominion Resources, Inc., 8.375%, Ser A  225,000  6,025,500 
DTE Energy Trust I, 7.800% (Z)  236,000  5,982,600 
DTE Energy Trust II, 7.500% (Z)  59,400  1,510,542 

Page 3 



John Hancock Preferred Income Fund III
Securities owned by the Fund on
October 31, 2009 (Unaudited)

      Shares  Value 
Utilities (continued)         
Interstate Power & Light Co., 7.100%, Ser C (Z)      208,900  5,274,725 
Public Service Electric & Gas Co., 5.050%, Ser D (Z)      30,000  2,610,900 
 
      Shares  Value 
Short-Term Investments 1.48%        $6,686,996 
(Cost $6,686,996)         
 
 
Repurchase Agreement 0.82%        3,687,000 
Repurchase Agreement with State Street Corp. dated 10-30-09 at         
 0.01% to be repurchased at $3,687,001 on 11-2-09, collateralized       
 by $3,765,000 Federal Home Loan Mortgage Corp., 2.00% due 9-       
 28-12 (valued at $3,765,000, including interest).      $3,687,000  3,687,000 
    Maturity     
  Yield *  date  Par value  Value 
U.S. Government Agency 0.66%        2,999,996 
Federal Home Loan Bank,         
   Discount Note  0.05%  11/02/09  3,000,000  2,999,996 
 
Total investments (Cost $831,554,477)† 153.24%        $691,821,915 
Other assets and liabilities, net (53.24%)        ($240,360,385) 
Total net assets 100.00%        $451,461,530 

The percentage shown for each investment category is the total value of the category as a percentage of the net assets of the Fund.

(I) Non-income producing security.

(S) This security is exempt from registration under Rule 144A of the Securities Act of 1933. Such securities may be resold, normally to qualified institutional buyers, in transactions exempt from registration.

(Z) All or a portion of this security is segregated as collateral for the Committed Facility Agreement. Total collateral value at October 31, 2009 was $503,928,021.

† At October 31, 2009, the aggregate cost of investment securities for federal income tax purposes was $831,733,285. Net unrealized depreciation aggregated $139,911,370, of which $13,302,705 related to appreciated investment securities and $153,214,075 related to depreciated investment securities.

* Yield represents either the annualized yield at the date of purchase, the stated coupon rate or, for floating securities, the rate at period end.

Page 4 



Notes to the Schedule of Investments (Unaudited)

Security valuation

Investments are stated at value as of the close of regular trading on the New York Stock Exchange (NYSE), normally at 4:00 P.M., Eastern Time. Equity securities held by the Fund are valued at the last sale price or official closing price (closing bid price or last evaluated price if no sale has occurred) as of the close of business on the principal securities exchange (domestic or foreign) on which they trade. Debt obligations are valued based on the evaluated prices provided by independent pricing services, which utilizes both dealer-supplied quotes and electronic data processing techniques, which take into account factors such as institutional-size trading in similar groups of securities, yield, quality, coupon rate, maturity, type of issue, trading characteristics and other market data. Foreign securities and currencies are valued in U.S. dollars, based on foreign currency exchange rates supplied by an independent pricing service. Securities traded only in the over-the-counter market are valued at the last bid price quoted by brokers making markets in the securities at the close of trading. Equity and debt obligations, for which there are no prices available from an independent pricing service, are valued based on bid quotations, or evaluated prices, as applicable, obtained from broker-dealers or fair valued as described below. Certain short-term debt instruments are valued at amortized cost.

Other assets and securities for which no such quotations are readily available are valued at fair value as determined in good faith by the Fund’s Pricing Committee in accordance with procedures adopted by the Board of Trustees. Generally, trading in non-U.S. securities is substantially completed each day at various times prior to the close of trading on the NYSE. The values of such securities used in computing the net asset value of the Fund’s shares are generally determined as of such times. Occasionally, significant events that affect the values of such securities may occur between the times at which such values are generally determined and the close of the NYSE. Upon such an occurrence, these securities will be valued at fair value as determined in good faith under consistently applied procedures established by and under the general supervision of the Board of Trustees.

Fair value measurements

The Fund uses a three-tier hierarchy to prioritize the assumptions, referred to as inputs, used in valuation techniques to measure fair value. The three-tier hierarchy of inputs and the valuation techniques used are summarized below:

Level 1 — Exchange traded prices in active markets for identical securities. This technique is used for exchange-traded domestic common and preferred equities, certain foreign equities, warrants, rights, options and futures.

Level 2 — Prices determined using significant observable inputs. Observable inputs may include quoted prices for similar securities, interest rates, prepayment speeds and credit risk. Prices for securities valued using these techniques are received from independent pricing vendors and are based on an evaluation of the inputs described. These techniques are used for certain domestic preferred equities, certain foreign equities, unlisted rights and warrants, and fixed income securities. Also, over-the-counter derivative contracts, including swaps use these techniques.

Level 3 — Prices determined using significant unobservable inputs. In situations where quoted prices or observable inputs are unavailable, such as when there is little or no market activity for an investment, unobservable inputs may be used. Unobservable inputs reflect the Fund’s Pricing Committee’s own assumptions about the factors that market participants would use in pricing an investment and would be based on the best information available. Securities using this technique are generally thinly traded or privately placed, and may be valued using broker quotes, which may not only use observable or unobservable inputs but may also include the use of the brokers’ own judgments about the assumptions that market participants would use.



The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities.

The following is a summary of the inputs used to value the Fund’s investments as of October 31, 2009, by major security category or security type. Other financial instruments are derivative instruments not reflected in the Portfolio of Investments, such as interest rate swap contracts, which are stated at market value.

Investments in Securities  Level 1  Level 2  Level 3  Total 
Consumer Discretionary  $51,355,820  -  -  $51,355,820 
Consumer Staples  -  $12,382,500  -  12,382,500 
Energy  37,176,047  10,578,000  -  47,754,047 
Financials  305,897,869  26,920,000  $22,695,686  355,513,555 
Telecommunication Services  34,431,732  -  -  34,431,732 
Utilities  141,911,267  41,785,998  -  183,697,265 
Short-Term Investments  -  6,686,996  -  6,686,996 
Total Investments in         
Securities  $570,772,735  $98,353,494  $22,695,686  $691,821,915 
Other Financial         
Instruments  -  (12,129,342)  -  (12,129,342) 
Totals  $570,772,735  $86,224,152  $22,695,686  $679,692,573 

The following is a reconciliation of Level 3 assets for which significant unobservable inputs were used to determine fair value:

  Financials 
Balance as of July 31, 2009  $21,421,229 
Accrued discounts/premiums  - 
Realized gain (loss)  - 
Change in unrealized appreciation (depreciation)  1,274,457 
Net purchases (sales)  - 
Transfers in and/or out of Level 3  - 
Balance as of October 31, 2009  $22,695,686 

Repurchase agreements

The Fund may enter into repurchase agreements. When the Fund enters into a repurchase agreement through its custodian, it receives delivery of securities, the amount of which, at the time of purchase and each subsequent business day, is required to be maintained at such a level that the market value is generally at least 102% of the repurchase amount. The Fund will take receipt of all securities underlying the repurchase agreements it has entered into, until such agreements expire. If the seller defaults, the Fund would suffer a loss to the extent that proceeds from the sale of underlying securities were less than the repurchase amount. The Fund may enter into repurchase agreements maturing within seven days with domestic dealers, banks or other financial institutions deemed to be creditworthy by the Adviser.

Interest rate swap agreements

Interest rate swaps represent an agreement between two counterparties to exchange cash flows based on the difference in the two interest rates, applied to the notional principal amount for a specified period. The payment flows are usually netted against each other, with the difference being paid by one party to the other. The Fund settles accrued net receivable or payable under the swap contracts on a periodic basis. For more information on interest rate swap contracts, please refer to the Fund’s Prospectus, semi-annual and annual reports.



The Fund entered into interest rate swaps in anticipation of rising interest rates. The following summarizes the contracts held at October 31, 2009:

    PAYMENTS  PAYMENTS         
  NOTIONAL  MADE BY  RECEIVED  EFFECTIVE  TERMINATION  UNREALIZED  MARKET 
COUNTERPARTY  AMOUNT  FUND  BY FUND  DATE  DATE  DEPRECIATION  VALUE 
 
      3-Month         
Morgan Stanley  $52,500,000  4.14%  LIBOR (a)  11/23/2007  11/23/2010  ($2,816,910)  ($2,816,910) 
 
      3-Month         
Bank of America  87,500,000  4.37%  LIBOR (a)  11/15/2007  11/15/2010  (4,212,534)  (4,212,534) 
 
      3-Month         
Morgan Stanley  87,500,000  3.79%  LIBOR (a)  1/7/2008  1/7/2011  (5,099,898)  (5,099,898) 
  $227,500,000          ($12,129,342)  ($12,129,342) 

(a) At October 31, 2009, the 3-month LIBOR rate was 0.28063%.

Interest rate swap notional amounts at October 31, 2009 are generally representative of the interest rate swap activity during the period ended October 31, 2009.

Fair value of derivative instruments by risk category

The table below summarizes the fair values of derivatives held by the Fund at October 31, 2009 by risk category:

  Financial    Liability 
  instruments  Asset Derivatives  Derivatives 
  location  Fair Value  Fair Value 
  Interest rate swap     
Interest rate contracts  contracts  -  ($12,129,342) 






ITEM 2. CONTROLS AND PROCEDURES.

(a) Based upon their evaluation of the registrant's disclosure controls and procedures as conducted within 90 days of the filing date of this Form N-Q, the registrant's principal executive officer and principal accounting officer have concluded that those disclosure controls and procedures provide reasonable assurance that the material information required to be disclosed by the registrant on this report is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission's rules and forms.

(b) There were no changes in the registrant's internal control over financial reporting that occurred during the registrant's last fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting.

ITEM 3. EXHIBITS.

Separate certifications for the registrant's principal executive officer and principal accounting officer, as required by Rule 30a-2(a) under the Investment Company Act of 1940, are attached.



SIGNATURES 

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

John Hancock Preferred Income Fund III

By: /s/ Keith F. Hartstein
-------------------------------------
Keith F. Hartstein
President and Chief Executive Officer

Date: December 18, 2009

Pursuant to the requirements of the Securities Exchange Act of 1934 and the Investment Company Act of 1940, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

By: /s/ Keith F. Hartstein
-------------------------------------
Keith F. Hartstein
President and Chief Executive Officer

Date: December 18, 2009

By: /s/ Charles A. Rizzo
-------------------------------------
Charles A. Rizzo
Chief Financial Officer

Date: December 18, 2009