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) 101 Huntington Avenue, Boston, Massachusetts 02199 (Address of principal executive offices) (Zip code) Susan S. Newton, Secretary 101 Huntington Avenue Boston, Massachusetts 02199 (Name and address of agent for service) Registrant's telephone number, including area code: 617-375-1702 Date of fiscal year end: May 31 Date of reporting period: February 28, 2005 ITEM 1. SCHEDULE OF INVESTMENTS JOHN HANCOCK Preferred Income Fund III 2.28.2005 Quarterly Portfolio Holdings [A 2" x 1" John Hancock (Signature)/John Hancock Funds logo in lower, center middle of page. A tag line below reads "JOHN HANCOCK FUNDS."] John Hancock Preferred Income Fund III Securities owned by the Fund on February 28, 2005 (unaudited) Interest Maturity Credit Par value Issuer, description rate (%) date rating (A) ($000) Value --------------------------------------------------------------------------------------------------------------------------------- Bonds 6.93% $76,987,236 (Cost $73,583,972) Automobile Manufacturers 0.24% 2,656,363 Ford Motor Co., Note 7.450 07-16-2031 BBB- 2,755 2,656,363 Consumer Finance 0.27% 3,009,375 General Motors Acceptance Corp., Bond 8.000 11-01-2031 BBB- 3,000 3,009,375 Electric Utilities 3.75% 41,663,137 Black Hills Corp., Note 6.500 05-15-2013 BBB- 15,000 15,320,715 DPL, Inc., Sr Note 6.875 09-01-2011 B+ 7,000 7,696,220 Entergy Gulf States, Inc., 1st Mtg Bond 6.200 07-01-2033 BBB 15,000 15,146,370 Kentucky Power Co., Sr Note, Ser D 5.625 12-01-2032 BBB 3,565 3,499,832 Integrated Oil & Gas 0.52% 5,751,075 Amerada Hess Corp., Note 7.125 03-15-2033 BBB- 5,000 5,751,075 Multi-Utilities & Unregulated Power 1.09% 12,168,953 DTE Energy Co., Sr Note 6.375 04-15-2033 BBB- 7,500 7,977,953 TECO Energy, Inc., Note 7.000 05-01-2012 BB 3,810 4,191,000 Oil & Gas Refining & Marketing & Transportation 1.06% 11,738,333 Valero Energy Corp., Note 7.500 04-15-2032 BBB 9,500 11,738,333 Credit Par value Issuer, description, maturity date rating (A) ($000) Value --------------------------------------------------------------------------------------------------------------------------------- Capital preferred securities 8.04% $89,437,215 (Cost $88,535,738) Diversified Banks 3.21% 35,724,700 Credit Agricole Preferred Funding Trust, 7.00%, 01-29-49 A 9,000 9,524,700 Lloyds TSB Bank Plc, 6.90%, 11-29-49 (United Kingdom) A+ 25,000 26,200,000 Electric Utilities 0.68% 7,617,140 DPL Capital Trust II, 8.125%, 09-1-31 B 6,225 7,617,140 Gas Utilities 0.52% 5,732,247 KN Capital Trust III, 7.63%, 04-15-28 BB+ 4,960 5,732,247 Integrated Telecommunication Services 1.46% 16,172,344 TCI Communications Financing Trust III, 9.65%, 03-31-27 BB+ 14,210 16,172,344 Investment Banking & Brokerage 0.94% 10,505,560 HBOS Capital Funding L.P., 6.850%, 03-29-49 (United Kingdom) A 10,000 10,505,560 Multi-Utilities & Unregulated Power 0.90% 9,973,915 Dominion Resources Capital Trust I, 7.83%, 12-01-27 BBB- 9,097 9,973,915 Other Diversified Financial Services 0.33% 3,711,309 JPM Capital Trust I, 7.54%, 01-15-27 A- 3,447 3,711,309 Issuer Shares Value --------------------------------------------------------------------------------------------------------------------------------- Common stocks 3.08% $34,274,348 (Cost $31,095,298) Electric Utilities 2.10% 23,312,612 CH Energy Group, Inc. 20,600 950,690 Cinergy Corp. 157,860 6,385,437 OGE Energy Corp. 30,000 778,500 Progress Energy, Inc. 121,000 5,244,140 Scottish Power Plc, American Depositary Receipt (United Kingdom) 313,014 9,953,845 Multi-Utilities & Unregulated Power 0.98% 10,961,736 Duke Energy Corp. 182,041 4,913,287 TECO Energy, Inc. 380,645 6,048,449 Credit Issuer, description rating (A) Shares Value --------------------------------------------------------------------------------------------------------------------------------- Preferred stocks 81.54% $906,949,339 (Cost $883,253,945) Agricultural Products 1.44% 16,038,750 Ocean Spray Cranberries, Inc., 6.25%, Ser A (S) BB+ 195,000 16,038,750 Asset Management & Custody Banks 0.38% 4,262,432 BNY Capital V, 5.95%, Ser F A- 170,361 4,262,432 Automobile Manufacturers 3.22% 35,840,007 Ford Motor Co., 7.50% BBB- 771,385 19,438,902 General Motors Corp., 7.25%, Ser 07-15-41 BBB- 55,641 1,353,189 General Motors Corp., 7.375%, Ser 05-15-48 Baa2 593,194 14,503,593 General Motors Corp., 7.375%, Ser 10-01-51 BBB- 22,100 544,323 Broadcasting & Cable TV 0.34% 3,860,252 Shaw Communications, Inc., 8.50% (Canada) B+ 150,850 3,860,252 Consumer Finance 1.68% 18,691,839 Ford Motor Credit Co., 7.60% A3 25,000 642,500 Household Finance Corp., 6.875% A 636,118 16,920,739 SLM Corp., 6.97%, Ser A BBB+ 19,800 1,128,600 Diversified Banks 7.47% 83,035,011 BAC Capital Trust II, 7.00% A 83,300 2,180,794 BAC Capital Trust III, 7.00% A- 22,000 580,140 BAC Capital Trust IV, 5.875% A 406,400 10,143,744 Banco Santander, 6.41%, Ser 1 (Spain) BBB+ 100,000 2,635,000 Fleet Capital Trust VII, 7.20% A 61,604 1,622,033 Fleet Capital Trust IX, 6.00% A 469,200 11,870,760 Royal Bank of Scotland Group Plc, 5.75%, Ser L (United Kingdom) A 960,000 23,760,000 USB Capital IV, 7.35% A- 59,100 1,551,375 USB Capital V, 7.25% A- 60,700 1,608,550 Wachovia Preferred Funding Corp., 7.25%, Ser A BBB+ 674,800 19,521,964 Wells Fargo Capital Trust IV, 7.00% A 187,800 4,867,776 Wells Fargo Capital Trust VII, 5.85% A 107,500 2,692,875 Electric Utilities 15.21% 169,170,085 Ameren Corp., 9.75%, Conv BBB+ 220,100 6,085,765 American Electric Power Co., Inc., 9.25%, Conv BBB 240,800 10,595,200 Cleveland Electric Financing Trust I, 9.00% BB 27,400 751,582 Consolidated Edison, Inc., $5.00, Ser A BBB+ 30,000 2,703,000 Consolidated Edison, Inc., 7.25% A- 56,000 1,504,160 Detroit Edison Co., 7.375% BB+ 25,700 650,210 Entergy Mississippi, Inc., 7.25% A- 63,918 1,703,415 FPC Capital I, 7.10%, Ser A BB+ 641,700 16,113,087 FPL Group Capital Trust I, 5.875% BBB+ 478,254 12,071,131 FPL Group, Inc., 8.00%, Conv A- 112,000 6,909,280 Georgia Power Capital Trust V, 7.125% BBB+ 132,200 3,507,266 Georgia Power Co., 6.00%, Ser R A 737,085 18,950,455 Great Plains Energy, Inc., 8.00%, Conv BBB- 602,000 16,254,000 HECO Capital Trust III, 6.50% BBB- 130,000 3,489,200 Interstate Power & Light Co., 7.10%, Ser C BBB- 354,900 9,881,765 Interstate Power & Light Co., 8.375%, Ser B BBB- 54,500 1,869,895 Monongahela Power Co., $7.73, Ser L B- 65,557 6,490,143 Northern States Power Co., 8.00% BBB- 74,550 2,035,215 NVP Capital I, 8.20%, Ser A CCC+ 56,300 1,435,650 NVP Capital III, 7.75% CCC+ 379,305 9,531,935 Sierra Pacific Power Co., 7.80%, Ser 1 (Class A) CCC+ 73,507 1,865,240 TXU Corp., 7.24%, Ser B BB+ 150 15,375,000 TXU Corp., 8.125%, Conv Ba1 170,000 10,764,400 Virginia Power Capital Trust, 7.375% BBB- 325,900 8,633,091 Gas Utilities 5.55% 61,706,996 El Paso Tennessee Pipeline Co., 8.25%, Ser A CCC- 367,700 18,488,434 KeySpan Corp., 8.75%, Conv A 148,200 7,568,574 Laclede Capital Trust I, 7.70% BBB+ 63,300 1,718,595 SEMCO Capital Trust I, 10.25% B- 60,500 1,560,900 Southern Union Co., 7.55% BB+ 350,000 9,684,500 Southwest Gas Capital II, 7.70% BB 810,250 22,079,313 Vectren Utillity Holdings, Inc., 7.25% A- 23,200 606,680 Hotels, Resorts & Cruise Lines 0.28% 3,115,622 Hilton Hotels Corp., 8.00% BBB- 118,600 3,115,622 Integrated Oil & Gas 1.08% 12,012,840 Coastal Finance I, 8.375% CCC- 476,700 12,012,840 Integrated Telecommunication Services 1.29% 14,314,205 Telephone & Data Systems, Inc., 7.60%, Ser A A- 415,576 11,000,297 Verizon New England, Inc., 7.00%, Ser B A2 126,100 3,313,908 Investment Banking & Brokerage 9.04% 100,463,249 Bear Stearns Cos., Inc. (The), 5.49%, Depositary Shares, Ser G BBB 296,032 14,949,616 Lehman Brothers Holdings Capital Trust III, 6.375% Ser K BBB+ 793,400 20,469,720 Lehman Brothers Holdings, Inc., 5.67%, Depositary Shares, Ser D BBB+ 142,500 7,267,500 Merrill Lynch Preferred Capital Trust III, 7.00% A- 387,017 10,383,666 Merrill Lynch Preferred Capital Trust IV, 7.12% A- 222,700 6,010,673 Merrill Lynch Preferred Capital Trust V, 7.28% A- 356,700 9,734,343 Morgan Stanley Capital Trust III, 6.25% A- 764,025 19,390,955 Morgan Stanley Capital Trust IV, 6.25% A- 393,925 10,072,662 Morgan Stanley Capital Trust V, 5.75% A1 88,713 2,184,114 Life & Health Insurance 2.04% 22,744,122 Lincoln National Capital VI, 6.75%, Ser F BBB 294,000 7,793,940 Phoenix Cos., Inc. (The), 7.45% BBB 387,849 10,084,074 PLC Capital Trust IV, 7.25% BBB+ 120,600 3,205,548 PLC Capital Trust V, 6.125% BBB+ 66,000 1,660,560 Multi-Line Insurance 2.96% 32,928,601 ING Groep N.V., 7.20% (Netherlands) A- 641,000 17,044,190 ING Groep N.V., 7.05% (Netherlands) A- 603,970 15,884,411 Multi-Utilities & Unregulated Power 9.60% 106,738,968 Aquila, Inc., 7.875% B2 218,707 5,445,804 Avista Corp., $6.95, Ser K BB- 147,176 15,269,510 BGE Capital Trust II, 6.20% BBB- 592,728 15,144,200 Consumers Energy Co. Financing IV, 9.00% Ba2 189,700 5,095,342 DTE Energy Co., 8.75%, Conv BBB- 569,000 14,395,700 DTE Energy Trust I, 7.80% BB+ 106,500 2,811,600 Energy East Capital Trust I, 8.25% BBB- 179,900 4,733,169 Enterprise Capital Trust I, 7.44%, Ser A BB+ 68,200 1,736,372 Enterprise Capital Trust III, 7.25%, Ser C BB+ 104,100 2,647,263 ONEOK, Inc., 8.50%, Conv BBB+ 197,600 7,151,144 PSEG Funding Trust II, 8.75% BB+ 462,275 12,966,814 Public Service Electric & Gas Co., 5.05%, Ser D BB+ 30,000 2,707,500 Public Service Enterprise Group, Inc., 10.25%, Conv BBB- 105,600 7,296,960 Puget Sound Energy Capital Trust II, 8.40% BB 185,600 4,890,560 TECO Capital Trust I, 8.50% B 171,700 4,447,030 Oil & Gas Exploration & Production 3.66% 40,720,157 Anadarko Petroleum Corp., 5.46%, Depositary Shares, Ser B BBB- 24,600 2,435,400 Apache Corp., 5.68%, Depositary Shares, Ser B BBB 27,500 2,832,500 Devon Energy Corp., 6.49%, Ser A BB+ 25,250 2,665,453 Nexen, Inc., 7.35% (Canada) BB+ 1,216,579 32,786,804 Other Diversified Financial Services 9.51% 105,825,511 ABN AMRO Capital Funding Trust V, 5.90% A 867,400 21,459,476 ABN AMRO Capital Funding Trust VI, 6.25% A 400,000 10,312,000 Citigroup Capital VII, 7.125% A 30,042 779,590 Citigroup Capital VIII, 6.95% A 220,200 5,758,230 Citigroup Capital X, 6.10% A 720,000 18,302,400 Citigroup Capital IX, 6.00% A 384,700 9,667,511 General Electric Capital Corp., 5.875% AAA 370,930 9,399,366 General Electric Capital Corp., 6.10% AAA 94,747 2,419,838 J.P. Morgan Chase Capital XI, 5.875%, Ser K A- 1,035,000 25,554,150 J.P. Morgan Chase Capital XII, 6.25%, Ser L A- 60,000 1,537,200 J.P. Morgan Chase Capital XIV, 6.20%, Ser N A- 25,000 635,750 Real Estate Investment Trusts 4.85% 53,968,524 Duke Realty Corp., 6.50%, Depositary Shares, Ser K BBB 145,000 3,636,600 Duke Realty Corp., 6.60%, Depositary Shares, Ser L BBB 103,000 2,595,600 Duke Realty Corp., 6.625%, Depositary Shares, Ser J BBB 638,100 16,118,406 Kimco Realty Co., 6.65%, Depositary Shares, Ser F BBB+ 384,750 9,857,295 Public Storage, Inc., 6.50%, Depositary Shares, Ser W BBB+ 450,000 11,484,000 Public Storage, Inc., 7.50%, Depositary Shares, Ser V BBB+ 184,530 4,902,962 Public Storage, Inc., 7.625%, Depositary Shares, Ser T BBB+ 25,500 669,885 Public Storage, Inc., 8.00%, Depositary Shares, Ser R BBB+ 177,100 4,703,776 Regional Banks 0.21% 2,322,768 National Commerce Capital Trust II, 7.70% A- 86,800 2,322,768 Reinsurance 0.28% 3,133,656 RenaissanceRe Holdings Ltd., 6.08%, Ser C (Bermuda) BBB+ 127,800 3,133,656 Thrifts & Mortgage Finance 1.19% 13,186,712 Abbey National Plc, 7.25% (United Kingdom) A- 163,265 4,271,012 Abbey National Plc, 7.375% (United Kingdom) A- 339,000 8,915,700 Wireless Telecommunication Services 0.26% 2,869,032 United States Cellular, 7.50% A- 103,800 2,869,032 Interest Maturity Credit Par value Issuer, description rate (%) date rating (A) ($000) Value --------------------------------------------------------------------------------------------------------------------------------- Short-term investments 0.41% $4,600,000 (Cost $4,600,000) Government U.S. Agency 0.41% 4,600,000 Federal Home Loan Bank, Disc Note 2.510% 03-01-2005 AAA 4,600 4,600,000 Total investments 100.00% $1,112,248,138 John Hancock Preferred Income Fund III Financial futures contracts February 28, 2005 (unaudited) Number of Open contracts contracts Position Expiration Appreciation ---------------------------------------------------------------------------------------------------------- U.S. Treasury 10-Year Note 900 Short Jun 05 $809,325 John Hancock Preferred Income Fund III Interest rate swap contracts February 28, 2005 (unaudited) --------------------------------------------------------------------------------------------------------- Rate type -------------------------------------------------- Notional Payments made Payments received Termination amount by Fund by Fund date Appreciation $35,000,000 4.00% (a) 3-month LIBOR April 09 $40,254 (a) Fixed rate John Hancock Preferred Income Fund III Footnotes to Schedule of Investments February 28, 2005 (unaudited) (A) Credit ratings are unaudited and are rated by Moody's Investors Service where Standard & Poor's ratings are not available. (S) This security is exempt from registration under rule 144A of the Securities Act of 1933. Such security may be resold, normally to qualified institutional buyers, in transactions exempt from registration. Rule 144A securities amounted to $16,038,750 or 1.44% of the Fund's total investments as of February 28, 2005. Parenthetical disclosure of a foreign country in the security description represents country of a foreign issuer. The percentage shown for each investment category is the total value of that category as a percentage of the total investments of the Fund. The cost of investments owned on February 28, 2005, including short-term investments, was $1,081,068,953. Gross unrealized appreciation and depreciation of investments aggregated $38,257,464 and $7,078,279, respectively, resulting in net unrealized appreciation of $31,179,185. For more information Trustees Charles L. Ladner, Chairman* James F. Carlin Richard P. Chapman, Jr.* William H. Cunningham Ronald R. Dion Dr. John A. Moore* Patti McGill Peterson* Steven R. Pruchansky James A. Shepherdson Lt. Gen. Norman H. Smith, USMC (Ret.) *Members of the Audit Committee Officers James A. Shepherdson President and Chief Executive Officer Susan S. Newton Senior Vice President and Secretary William H. King Vice President and Treasurer Investment Adviser John Hancock Advisers, LLC 101 Huntington Avenue Boston, Massachusetts 02199-7603 Custodian The Bank of New York One Wall Street New York, New York 10286 Transfer Agent and Dividend Disburser Mellon Investor Services 85 Challenger Road Overpeck Centre Ridgefield Park, New Jersey 07660 Transfer Agent for APS Deutsche Bank Trust Company Americas 280 Park Avenue New York, New York 10017 Legal Counsel Wilmer Cutler Pickering Hale and Dorr LLP 60 State Street Boston, Massachusetts 02109-1803 Stock Symbol Listed New York Stock Exchange: HPS How to contact us Internet www.jhfunds.com Mail Regular mail: Mellon Investor Services 85 Challenger Road Overpeck Centre Ridgefield Park, NJ 07660 Phone Customer service representatives 1-800-852-0218 Portfolio commentary 1-800-344-7054 24-hour automated information 1-800-843-0090 TDD line 1-800-231-5469 This report is for the information of the shareholders of John Hancock Preferred Income Fund III. P12Q3 2/05 4/05 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. (d) 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: ------------------------------ James A. Shepherdson President and Chief Executive Officer Date: April 27, 2005 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: ------------------------------ James A. Shepherdson President and Chief Executive Officer Date: April 27, 2005 By: ------------------------------ William H. King Vice President and Treasurer Date: April 27, 2005