a_preferredincomethree.htm
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) 
Alfred E. Ouellette, Senior Counsel and Assistant Secretary 
601 Congress Street 
Boston, Massachusetts 02210 
(Name and address of agent for service) 
Registrant's telephone number, including area code: 617-663-4324 
 
Date of fiscal year end:  May 31 
 
 
Date of reporting period:  February 29, 2008 

ITEM 1. SCHEDULE OF INVESTMENTS




John Hancock
Preferred Income Fund III
Securities owned by the Fund on
February 29, 2008 (unaudited)

  Interest  Maturity  Credit  Par value   
Issuer, description  rate  date  rating (A)  (000)  Value 
Bonds 11.93%          $75,922,369 

(Cost $78,729,961)           
 
Automobile Manufacturers 0.29%          1,880,287 

Note  7.450%  07-16-31  CCC+  $2,755  1,880,287 
 
Consumer Finance 0.36%          2,267,976 

General Motors Acceptance Corp.,           
Bond  8.000  11-01-31  B+  3,000  2,267,976 
 
Electric Utilities 6.03%          38,361,325 

Black Hills Corp.,           
Note  6.500  05-15-13  BBB-  15,000  15,810,525 
DPL, Inc.,           
Sr Note  6.875  09-01-11  BBB-  5,036  5,444,843 
Entergy Gulf States, Inc.,           
1st Mtg Bond  6.200  07-01-33  BBB+  15,000  13,906,965 
Kentucky Power Co.,           
Sr Note, Ser D  5.625  12-01-32  BBB  3,565  3,198,992 
 
Gas Utilities 1.86%          11,816,813 

Southern Union Co.,           
Jr Sub Note Ser A (P)  7.200  11-01-66  BB  12,900  11,816,813 
 
Multi-Utilities 1.80%          11,455,193 

DTE Energy Co.,           
Sr Note  6.375  04-15-33  BBB-  7,500  7,346,805 
TECO Energy, Inc.,           
Note  7.000  05-01-12  BB+  3,810  4,108,388 
 
Oil & Gas Refining & Marketing 1.59%          10,140,775 

Valero Energy Corp.,           
Note  7.500  04-15-32  BBB  9,500  10,140,775 
  
  Interest  Maturity  Credit  Par value   
Issuer, description  rate  date  rating (A)  (000)  Value 
Capital preferred securities  11.30%          $71,929,209 

(Cost $75,992,170)           

Page 1 


John Hancock
Preferred Income Fund III
Securities owned by the Fund on
February 29, 2008 (unaudited)

Diversified Banks 6.59%          41,942,000 

Credit Agricole Preferred Funding Trust           
7.00%, 01-29-49  7.000  01-29-49  A  $9,000  8,820,000 
HBOS Capital Funding L.P., 6.85%,           
03-29-49, (United Kingdom) (F)  6.850  03-29-49  A  10,000  8,747,000 
Lloyds TSB Bank Plc, 6.90%, 11-29-49           
(United Kingdom) (F)  6.900  11-29-49  A+  25,000  24,375,000 
 
Electric Utilities 1.13%          7,176,802 

DPL Capital Trust II, 8.125%, 09-01-31  8.125  09-01-31  BB+  6,225  7,176,802 
 
Gas Utilities 2.09%          13,323,000 

KN Capital Trust I, 8.56%, 04-15-27, Ser B  8.560  04-15-27  B  8,735  8,735,000 
KN Capital Trust III, 7.63%, 04-15-28  7.630  04-15-28  B  4,960  4,588,000 
 
Multi-Utilities 1.49%          9,487,407 

Dominion Resources Capital Trust I,           
7.83%,12-01-27  7.830  12-01-27  BBB  9,097  9,487,407 
 
Issuer        Shares  Value 
Common stocks  0.74%          $4,704,550 

(Cost $6,218,297)           
 
Electric Utilities 0.74%          4,704,550 

Great Plains Energy, Inc.        185,000  4,704,550 
 
      Credit     
Issuer, description      rating (A)  Shares  Value 
Preferred stocks  130.57%          $830,921,706 

(Cost $908,645,996)           
 
Agricultural Products  2.82%          17,958,291 

Ocean Spray Cranberries, Inc., 6.25%,           
Ser A (S)      BB+  195,000  17,958,291 
 
Automobile Manufacturers 3.57%          22,694,259 

Ford Motor Co., 7.50%      CCC+  761,385  12,410,575 
General Motors Corp., 7.25%, Ser 07-15-41      B-  50,641  878,115 
General Motors Corp., 7.375%, Ser 05-15-48      B-  558,194  9,405,569 
  
Broadcasting & Cable TV 3.86%          24,575,672 

CBS Corp., 6.75%      BBB  164,600  3,846,702 
Comcast Corp., 6.625%      BBB+  130,000  2,990,000 
Comcast Corp., 7.00%      BBB+  119,900  2,926,759 
Comcast Corp., 7.00%, Ser B      BBB+  609,556  14,812,211 

Page 2 


John Hancock
Preferred Income Fund III
Securities owned by the Fund on
February 29, 2008 (unaudited)

Consumer Finance 4.18%      26,613,941 

HSBC Finance Corp., 6.36%, Depositary       
Shares, Ser B  A  270,000  6,018,300 
HSBC Finance Corp., 6.875%  AA-  626,118  15,496,421 
SLM Corp., 6.00%  BBB-  162,495  2,981,783 
SLM Corp., 6.97%, Ser A  BB  44,899  2,117,437 
 
Diversified Banks 10.41%      66,256,935 

BAC Capital Trust II, 7.00%  A+  94,600  2,340,404 
BAC Capital Trust III, 7.00%  A+  22,000  547,580 
BAC Capital Trust IV, 5.875%  A+  131,400  2,906,568 
Barclays Bank Plc, 7.10%, Ser 3 (United       
Kingdom) (F)  A+  60,000  1,509,600 
Fleet Capital Trust VIII, 7.20%  A+  30,400  758,480 
Royal Bank of Scotland Group Plc, 5.75%,       
Ser L (United Kingdom) (F)  A  960,000  20,342,400 
Royal Bank of Scotland Group Plc, 7.25%,       
Ser T (United Kingdom) (F)  A  40,000  1,011,200 
Santander Finance Preferred SA,       
Unipersonal, 6.41%, Ser 1 (Spain) (F)  A+  100,000  2,340,000 
USB Capital VIII, 6.35%, Ser 1  A+  269,700  6,313,677 
USB Capital X, 6.50%  A+  80,000  1,900,800 
Wachovia Corp., 8.00%  A  200,000  5,060,000 
Wachovia Preferred Funding Corp., 7.25%,       
Ser A  A  674,800  16,768,780 
Wells Fargo Capital Trust IV, 7.00%  AA-  177,800  4,457,446 
 
Electric Utilities 18.84%      119,921,139 

Consolidated Edison, Inc., $5.00, Ser A  BBB+  30,000  2,709,300 
DTE Energy Trust II, 7.50%  BB+  37,400  930,138 
Entergy Mississippi, Inc., 7.25%  A-  113,668  2,846,247 
FPC Capital I, 7.10%, Ser A  BBB-  783,400  19,193,300 
FPL Group Capital Trust I, 5.875%  BBB+  480,000  11,596,800 
FPL Group Capital, Inc., 7.45%, Ser E  BBB+  120,000  3,120,000 
Georgia Power Co., 6.00%, Ser R  A  730,000  17,914,200 
HECO Capital Trust III, 6.50%  BB+  140,000  3,462,200 
Interstate Power & Light Co., 7.10%, Ser C  BBB-  354,900  9,282,871 
Interstate Power & Light Co., 8.375%, Ser B  Baa2  54,500  1,635,000 
PPL Electric Utilities Corp., 6.25%,       
Depositary Shares  BBB  189,000  4,624,603 
PPL Energy Supply, LLC, 7.00%  BBB  857,770  21,693,003 
Southern California Edison Co., 6.00%,       
Ser C  BBB-  30,000  2,968,125 
Southern California Edison Co., 6.125%  BBB-  20,000  1,985,626 
Virginia Power Capital Trust, 7.375%  BBB  513,650  12,964,526 
Westar Energy, Inc., 6.10%  A  117,000  2,995,200 

Page 3 


John Hancock
Preferred Income Fund III
Securities owned by the Fund on
February 29, 2008 (unaudited)

Gas Utilities 5.45%      34,665,393 

Laclede Capital Trust I, 7.70%  BBB+  82,800  2,142,864 
Southern Union Co., 7.55%, Ser A  BB  449,000  11,314,800 
Southwest Gas Capital II, 7.70%  BB  850,350  21,207,729 
 
Integrated Telecommunication Services 3.92%      24,973,141 

Telephone & Data Systems, Inc., 6.625%  BB+  497,600  10,733,232 
Telephone & Data Systems, Inc., 7.60%,       
Ser A  BB+  648,743  14,239,909 
 
Investment Banking & Brokerage 15.24%      97,001,222 

Fleet Capital Trust IX, 6.00%  A+  469,200  10,510,080 
Goldman Sachs Group, Inc., 6.20%, Ser B  A  240,000  5,716,800 
Lehman Brothers Holdings Capital Trust       
III, 6.375%, Ser K  A-  798,400  17,844,240 
Lehman Brothers Holdings, Inc., 5.67%,       
Depositary Shares, Ser D  A-  142,601  5,982,112 
Merrill Lynch Preferred Capital Trust III,       
7.00%  A-  457,017  11,082,662 
Merrill Lynch Preferred Capital Trust IV,       
7.12%  A-  380,700  9,365,220 
Merrill Lynch Preferred Capital Trust V,       
7.28%  A-  408,700  10,054,020 
Morgan Stanley Capital Trust III, 6.25%  A  764,025  16,541,141 
Morgan Stanley Capital Trust IV, 6.25%  A  398,925  8,740,447 
Morgan Stanley Capital Trust VI, 6.60%  A  50,000  1,164,500 
 
Life & Health Insurance 8.92%      56,749,302 

Lincoln National Capital VI, 6.75%, Ser F  A-  304,000  7,448,000 
MetLife, Inc., 6.50%, Ser B  BBB  1,108,850  26,612,400 
Phoenix Cos., Inc. (The), 7.45%  BBB-  598,149  14,200,057 
PLC Capital Trust IV, 7.25%  BBB+  181,600  4,385,640 
PLC Capital Trust V, 6.125%  BBB+  83,300  1,790,950 
Prudential Plc, 6.50% (United Kingdom) (F)  A-  93,500  2,312,255 
 
Movies & Entertainment 4.37%      27,833,730 

Viacom, Inc., 6.85%  BBB  1,196,635  27,833,730 
 
Multi-Line Insurance 7.24%      46,080,045 

Aegon NV, 6.375% (Netherlands) (F)  A-  241,265  5,457,414 
Aegon NV, 6.50% (Netherlands) (F)  A-  162,950  3,778,811 
ING Groep NV, 7.05% (Netherlands) (F)  A  603,970  14,501,320 
ING Groep NV, 7.20% (Netherlands) (F)  A  765,000  18,933,750 
ING Groep NV, 7.375% (Netherlands) (F)  A  135,000  3,408,750 

Page 4 


John Hancock
Preferred Income Fund III
Securities owned by the Fund on
February 29, 2008 (unaudited)

Multi-Utilities 6.98%        44,402,531 

BGE Capital Trust II, 6.20%    BBB-  807,028  18,400,238 
DTE Energy Trust I, 7.80%    BB+  233,400  5,926,026 
PNM Resources, Inc., 6.75%, Conv    BB+  322,999  7,341,767 
Public Service Electric & Gas Co., 5.05%,       
Ser D    BB+  30,000  2,710,500 
Xcel Energy Inc., 7.60%    BBB-  400,000  10,024,000 
 
Oil & Gas Exploration & Production  6.20%        39,422,921 

Devon Energy Corp., 6.49%, Ser A    BB+  25,250  2,581,025 
Nexen, Inc., 7.35% (Canada) (F)    BB+  1,535,079  36,841,896 
 
Other Diversified Financial Services  15.24%        96,963,340 

ABN AMRO Capital Funding Trust V, 5.90%  A  750,500  16,413,435 
ABN AMRO Capital Funding Trust VI, 6.25%  A  343,900  8,047,260 
Citigroup Capital VII, 7.125%    A  161,042  3,858,566 
Citigroup Capital VIII, 6.95%    A  326,200  7,721,154 
Citigroup Capital X, 6.10%    A  720,000  15,530,400 
DB Capital Funding VIII, 6.375%    A+  422,850  10,135,715 
DB Capital Trust II, 6.55%    A+  506,050  11,740,360 
JPMorgan Chase Capital XI, 5.875%, Ser K  A  985,000  21,867,000 
JPMorgan Chase Capital XIV, 6.20%, Ser N  A  25,000  582,500 
JPMorgan Chase Capital XVI, 6.35%    A  45,000  1,066,950 
 
Real Estate Management & Development 5.39%      34,319,441 

Duke Realty Corp., 6.50%, Depositary         
Shares, Ser K REIT    BBB  151,600  3,179,052 
Duke Realty Corp., 6.60%, Depositary         
Shares, Ser L REIT    BBB  118,500  2,519,310 
Duke Realty Corp., 6.625%, Depositary         
Shares, Ser J REIT    BBB  638,100  13,668,102 
Public Storage, Inc., 6.18%, Depositary         
Shares, Ser D REIT    BBB+  25,000  525,000 
Public Storage, Inc., 6.50%, Depositary         
Shares, Ser W REIT    BBB+  450,000  9,805,500 
Public Storage, Inc., 7.50%, Depositary         
Shares, Ser V REIT    BBB+  184,530  4,622,477 

Page 5 


John Hancock
Preferred Income Fund III
Securities owned by the Fund on
February 29, 2008 (unaudited)

Regional Banks 3.79%          24,128,412 

PFGI Capital Corp., 7.75%      A  926,900  24,128,412 
 
Reinsurance 0.41%          2,581,560 

RenaissanceRe Holdings Ltd., 6.08%, Ser C         
(Bermuda) (F)      BBB+  127,800  2,581,560 
 
Specialized Finance 1.06%          6,730,230 

CIT Group, Inc., 6.35%, Ser A      BBB+  140,000  2,832,200 
Repsol International Capital Ltd., 7.45%,           
Ser A (Cayman Islands) (F)      BB+  155,300  3,898,030 
 
Wireless Telecommunication Services 2.68%          17,050,201 

United States Cellular Corp., 7.50%      BB+  754,100  17,050,201 
  Interest  Maturity  Credit  Par value   
Issuer, description  rate  date  rating (A)  (000)  Value 
Short-term investments 0.83%        $5,300,000 

(Cost $5,299,420)           
 
Government U.S. Agency 0.83%          5,300,000 

Federal Home Loan Bank           
Discount Note  1.970%  03-03-08  AAA  $5,300  5,300,000 
 
 
Total investments (Cost $1,074,885,844)155.37%    $988,777,834 

Liabilities in excess of other assets (0.36%)      ($2,315,001) 

Fund preferred shares, at liquidation value (55.01%)    ($350,064,662) 

Total net assets applicable to common shareholders  100.00%  $636,398,171 


The percentage shown for each investment category is the total value of that category, as a percentage of the net assets applicable to common shareholders.

Page 6 


John Hancock
Preferred Income Fund III
Notes to Schedule of Investments
February 29, 2008 (unaudited)

REIT Real Estate Investment Trust

(A) Credit ratings are unaudited and are rated by Moody's Investors Service where Standard & Poor's ratings are not available unless indicated otherwise.

(F) Parenthetical disclosure of a foreign country in the security description represents country of a foreign issuer.

(P) Variable rate obligation. The coupon rate shown represents the rate at end of period.

(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. Rule 144A securities amounted to $17,958,291 or 2.82% of the net assets applicable to common shareholders as of February 29, 2008.

† The cost of investments owned on February 29, 2008, including short-term investments, for federal income tax purposes was $1,075,373,204. Gross unrealized appreciation and depreciation of investmentsaggregated $6,709,750 and $93,305,120, respectively, resulting in net unrealized depreciation of $86,595,370.

Notes to Schedule of Investments - Page 1 


John Hancock
Preferred Income Fund III
Financial futures contracts
February 29, 2008 (unaudited)

  Number of      Unrealized 
Open contracts  contracts  Position  Expiration  Depreciation 

 
U.S. Treasury 10-Year Note  1,375  Short  Jun 08  ($4,123,886) 

Financial futures contracts 


John Hancock

Preferred Income Fund III

Interest rate swap contracts February 29, 2008 (unaudited)

  Rate type         

Notional  Payments made    Payments received  Termination    Unrealized 
amount  by Fund    by Fund  date  Counterparty  Depreciation 

$52,500,000  4.142%  (a)  3-month LIBOR  Nov 2010  Morgan Stanley  ($1,963,814) 
87,500,000  4.374  (a)  3-month LIBOR  Nov 2010  Bank of America  (3,808,882) 
87,500,000  3.790  (a)  3-month LIBOR  Jan 2011  Morgan Stanley  (2,377,965) 
35,000,000  3.998  (a)  3-month LIBOR  Apr 2009  Morgan Stanley  (612,462) 

Total            ($8,763,123) 

(a) Fixed rate

Interest rate swap contracts 


Notes to portfolio of investments

Security valuation

The net asset value of common shares of the Fund is determined daily as of the close of the New York Stock Exchange (NYSE), normally at 4:00 P.M., Eastern Time. Short-term debt investments that have a remaining maturity of 60 days or less are valued at amortized cost, and thereafter assume a constant amortization to maturity of any discount or premium, which approximates market value. All other securities held by the Fund are valued at the last sale price or official closing price (closing bid price or last evaluated quote if no sale has occurred) as of the close of business on the principal securities exchange (domestic or foreign) on which they trade or, lacking any sales, at the closing bid price. 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. Securities for which there are no such quotations, principally debt securities, are valued based on the evaluated prices provided by an independent pricing service, which utilizes both dealer-supplied 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.

Other assets and securities for which no such quotations are readily available are 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. 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.

Investment risk

The Fund may invest a portion of its assets in issuers and/or securities of issuers that hold mortgage securities, including subprime mortgage securities. The value of these securities is sensitive to changes in economic conditions, including delinquencies and/or defaults, and may be adversely affected by shifts in the market’s perception of the issuers and changes in interest rates.

Futures

The Fund may purchase and sell financial futures contracts and options on those contracts. The Fund invests in contracts based on financial instruments such as U.S. Treasury Bonds or Notes or on securities indices such as the Standard & Poor’s 500 Index, in order to hedge against a decline in the value of securities owned by the Fund.

Initial margin deposits required upon entering into futures contracts are satisfied by the delivery of specific securities or cash as collateral to the broker (the Fund’s agent in acquiring the futures position). If the position is closed out by an opposite position prior to the settlement date of the futures contract, a final determination of variation margin is made, cash is required to be paid to or released by the broker and the Fund realizes a gain or loss.

When the Fund sells a futures contract based on a financial instrument, the Fund becomes obligated to deliver that kind of instrument at an agreed upon date for a specified price. The Fund realizes a gain or loss depending on whether the price of an offsetting purchase is less or more than the price of the initial sale or on whether the price of an offsetting sale is more or less than the price of the initial purchase. The Fund could be exposed to risks if it could not close out futures positions because of an illiquid secondary market or the inability of counterparties to meet the terms of their contracts. Futures contracts are valued at the quoted daily settlement prices established by the exchange on which they trade.

Swap contracts

The Fund may enter into swap transactions in order to hedge the value of the Fund’s portfolio against interest rate fluctuations or to enhance the Fund’s income or to manage the Fund’s exposure to credit or market risk.

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.

The Fund records changes in the value of the swap as unrealized gains or losses on swap contracts. Net periodic payments accrued but not yet received (paid) are included in change in the unrealized appreciation/depreciation on the Statement of Operations. Accrued interest income and interest expense on swap contracts are recorded as realized gain (loss).

Swap contracts are subject to risks related to the counterparty’s ability to perform under the contract, and may decline in value if the counterparty’s creditworthiness deteriorates. The risks may arise from unanticipated movement in interest rates. The Fund may also suffer losses if it is unable to terminate outstanding swap contracts or reduce its exposure through offsetting transactions.

Notes to Schedule of Investments - Page 2 




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: April 23, 2008

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: April 23, 2008

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

Date: April 23, 2008