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

FORM N-Q

QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS OF REGISTERED
MANAGEMENT INVESTMENT COMPANY

Investment Company Act file number 811-21280

Name of Fund: BlackRock Preferred Opportunity Trust (BPP)

Fund Address: 100 Bellevue Parkway, Wilmington, DE 19809

Name and address of agent for service: Donald C. Burke, Chief Executive Officer, BlackRock Preferred Opportunity Trust, 800 Scudders Mill Road, Plainsboro, NJ, 08536. Mailing address: P.O. Box 9011, Princeton, NJ, 08543-9011

Registrant’s telephone number, including area code: (800) 882-0052, Option 4

Date of fiscal year end: 12/31/2008

Date of reporting period: 07/01/2008 – 09/30/2008

Item 1 – Schedule of Investments

BlackRock Preferred Opportunity Trust        
Schedule of Investments September 30, 2008 (Unaudited) (Percentages shown are based on Net Assets)
      Par    
Industry Corporate Bonds   (000)   Value
Auto Components - 0.0% Metaldyne Corp., 10%, 11/01/13 USD 125   $18,750
Building Products - 0.9% C8 Capital SPV Ltd., 6.64% (a)(b)(c) 1,945   1,817,583
Chemicals - 0.1% Key Plastics LLC, 11.75%, 3/15/13 (a) 630   220,500
Commercial Banks - 25.5% BNP Paribas, 7.195% (a)(b)(c)(d)   12,175   8,464,060
  Bank of Ireland Capital Funding II, LP, 5.571% (a)(b)(c) 4,015   2,316,257
  Bank of Ireland Capital Funding III, LP, 6.107% (a)(b)(c) 4,275   2,550,559
  CBA Capital Trust I, 5.805% (a)(b)(d) 5,000   3,453,138
  Credit Agricole SA, 6.637% (a)(b)(c)(d) 16,385   11,048,012
  Lloyds TSB Bank Plc, 6.90% (b)   6,399   4,287,330
  RESPARCS Funding LP I, 8% (b)   4,000   1,800,000
  Royal Bank of Scotland Group Plc, 7.648% (b)(c) 1,960   1,610,828
  Royal Bank of Scotland Group Plc Series MTN, 7.64% (b)(c) 3,700   2,756,567
  Societe Generale, 5.922% (a)(b)(c)(d) 6,575   5,397,779
  Standard Chartered Bank, 7.014% (a)(b)(c) 2,950   2,481,118
  Sumitomo Mitsui Banking Corp., 5.625% (a)(b)(c)(d) 5,000   3,994,385
  SunTrust Preferred Capital I, 5.853% (b)(c) 2,050   1,127,500
          51,287,533
Containers & Packaging - 0.1% Impress Holdings BV, 7.878%, 9/15/13 (a)(c) 240   204,000
Diversified Financial Bank of America Corp. Series K, 8% (b)(c)(d) 12,575   9,957,727
Services - 7.9% JPMorgan Chase Capital XXI Series U, 3.741%,      
  2/02/37 (c)(d)   7,730   5,990,734
          15,948,461
Diversified Telecommunication Qwest Corp., 6.069%, 6/15/13 (c)   460   391,000
Services - 0.2%          
Electric Utilities - 1.1% PPL Capital Funding, 6.70%, 3/30/67 (c) 2,675   2,167,785
Energy Equipment & Services - Grant Prideco, Inc. Series B, 6.125%, 8/15/15 100   97,591
0.0%          
Hotels, Restaurants & Greektown Holdings, LLC, 10.75%, 12/01/13 (a)(e)(f) 362   249,780
Leisure - 0.1% Wynn Las Vegas LLC, 6.625%, 12/01/14 40   34,100
          283,880
Insurance - 31.4% AXA SA, 6.379% (a)(b)(c)(d)   7,150   3,990,408
  The Allstate Corp. Series B, 6.125%, 5/15/67 (c) 5,200   3,816,472
  American International Group, Inc., 8.175%,      
  5/15/58 (a)(c)   8,390   1,344,028
  American International Group, Inc., 6.25%, 3/15/87 (d) 5,555   890,011
  Chubb Corp., 6.375%, 3/29/67 (c)(d) 9,025   6,882,230
  Everest Reinsurance Holdings, Inc., 6.60%, 5/01/67 (c)(d) 7,135   4,170,165
  Genworth Financial, Inc., 6.15%, 11/15/66 (c) 1,475   645,948
  Kingsway America, Inc., 7.50%, 2/01/14 9,000   6,772,500
  Liberty Mutual Group, Inc., 7%, 3/15/37 (a)(c) 5,025   3,542,590
  Liberty Mutual Group, Inc., 10.75%, 6/15/88 (a)(c) 3,875   2,790,000
  Lincoln National Corp., 7%, 5/17/66 (c) 3,370   2,569,915
  MetLife, Inc., 6.40%, 12/15/66 (d) 6,375   3,974,404
  Nationwide Life Global Funding I, 6.75%, 5/15/67 (d) 4,850   2,622,943
  PartnerRe Finance II, 6.44%, 12/01/66 (c) 2,850   2,059,758
  Prudential Plc, 6.50% (b)   6,000   2,580,000

1

BlackRock Preferred Opportunity Trust        
Schedule of Investments September 30, 2008 (Unaudited) (Percentages shown are based on Net Assets)
      Par    
Industry Corporate Bonds   (000)   Value
  QBE Capital Funding II LP, 6.797% (a)(b)(c)(d) USD 4,250   $3,393,060
  Reinsurance Group of America, 6.75%,        
  12/15/65 (c)   1,300   846,537
  Swiss Re Capital I LP, 6.854% (a)(b)(c)(d)   9,425   8,010,176
  White Mountains Re Group Ltd., 7.506% (a)(b)(c)   2,600   1,706,783
  ZFS Finance (USA) Trust IV, 5.875%, 5/09/32 (a)(c)   650   443,365
          63,051,293
Machinery - 0.2% AGY Holding Corp., 11%, 11/15/14   460   409,400
Media - 2.5% CMP Susquehanna Corp., 9.875%, 5/15/14 (a)   110   61,600
  Comcast Holdings Corp., 2%, 11/15/29 (g)   110   4,344,719
  R.H. Donnelley Corp., 11.75%, 5/15/15 (a)   134   81,740
  Windstream Regatta Holdings, Inc., 11%, 12/01/17 (a) 902   505,120
          4,993,179
Metals & Mining - 0.8% Freeport-McMoRan Copper & Gold, Inc., 7.084%,        
  4/01/15 (c)   200   191,578
  Freeport-McMoRan Copper & Gold, Inc., 8.375%, 4/01/17 1,400   1,379,000
          1,570,578
Multi-Utilities - 0.4% Puget Sound Energy, Inc. Series A, 6.974%, 6/01/67 (c) 925   781,625
Oil, Gas & Consumable Fuels - Conoco Funding Co., 6.35%, 10/15/11   3,000   3,106,872
4.0% EXCO Resources, Inc., 7.25%, 1/15/11   75   70,875
  Plains All American Pipeline LP, 6.50%, 5/01/18 (a)   1,540   1,389,231
  TransCanada PipeLines Ltd., 6.35%, 5/15/67 (c)(d)   4,325   3,421,430
          7,988,408
Paper & Forest Products - 0.4% International Paper Co., 8.70%, 6/15/38   900   901,668
Professional Services - 0.1% FTI Consulting, Inc., 7.75%, 10/01/16   100   101,625
Specialty Retail - 0.3% Lazy Days' R.V. Center, Inc., 11.75%, 5/15/12   1,199   515,570
  Total Corporate Bonds - 76.0%       152,750,429
  Capital Trusts        
Capital Markets - 4.6% Credit Suisse Guernsey Ltd., 5.86% (b)(c)   3,880   2,937,420
  State Street Capital Trust III, 8.25% (b)(c)   1,920   1,882,675
  State Street Capital Trust IV, 3.819%, 6/01/67 (c)(d) 6,725   4,435,729
          9,255,824
Commercial Banks - 11.1% Abbey National Capital Trust I, 8.963% (b)(c)   1,425   1,525,390
  BB&T Capital Trust IV, 6.82%, 6/12/77 (c)(d)   9,150   6,020,609
  Barclays Bank Plc, 5.926% (a)(b)(c)   3,185   2,214,910
  Barclays Bank Plc, 7.434% (a)(b)(c)   580   472,303
  FCB/NC Capital Trust I, 8.05%, 3/01/28   1,100   1,037,817
  Huntington Capital III, 6.65%, 5/15/37 (c)   1,925   708,700
  NBP Capital Trust III, 7.375% (b)   2,000   1,290,000
  Regions Financing Trust II, 6.625%, 5/15/47 (c)   1,970   1,110,385
  SMFG Preferred Capital USD 3 Ltd., 9.50% (a)(b)(c)   1,725   1,642,397
  Wachovia Corp. Series K, 7.98% (b)(c)(d)   5,875   2,455,398
  Wells Fargo Capital XIII Series GMTN, 7.70% (b)(c)   1,700   1,482,417
  Westpac Capital Trust IV, 5.256% (a)(b)(c)   3,000   2,318,970
          22,279,296

2

BlackRock Preferred Opportunity Trust        
Schedule of Investments September 30, 2008 (Unaudited) (Percentages shown are based on Net Assets)
      Par    
Industry Capital Trusts   (000)   Value
Diversified Financial Bank of America Corp. Series M, USD 7,500   $6,059,550
Services - 11.9% 8.125% (b)(c)(d)        
  Citigroup, Inc. Series E, 8.40% (b)(c)(d)   8,500   5,785,610
  JPMorgan Chase & Co., 7.90% (b)(c)(d)   8,025   6,756,087
  JPMorgan Chase Capital XXIII, 3.804%, 5/15/77 (c) 2,670   1,431,990
  JPMorgan Chase Capital XXV, 6.80%, 10/01/37 (d) 5,075   3,890,261
          23,923,498
Insurance - 17.2% AFC Capital Trust I Series B, 8.207%, 2/03/27 4,500   3,735,000
  The Allstate Corp., 6.50%, 5/15/57 (c)(d)   6,350   3,983,501
  American General Institutional Capital A, 7.57%,        
  12/01/45 (a)(d)   9,605   1,773,880
  Lincoln National Corp., 6.05%, 4/20/67 (c) 2,500   1,650,000
  Mangrove Bay Pass-Through Trust, 6.102%, 7/15/33 (a)(c) 5,000   2,285,450
  Progressive Corp., 6.70%, 6/15/37 (c)(d)   5,775   4,705,262
  The Travelers Cos., Inc., 6.25%, 3/15/67 (c)(d) 11,350   8,729,671
  ZFS Finance (USA) Trust V, 6.50%, 5/09/67 (a)(c)(d) 8,765   5,872,550
  Zenith National Insurance Capital Trust I, 8.55%,      
  8/01/28 (a)   1,800   1,719,000
          34,454,314
Thrifts & Mortgage Finance - 0.6% Webster Capital Trust IV, 7.65%, 6/15/37 (c) 1,925   1,278,006
  Total Capital Trusts - 45.4%       91,190,938
  Preferred Stocks   Shares    
Capital Markets - 0.0% Lehman Brothers Holdings Inc. Series D, 5.67% (e)(f) 31,100   2,177
Commercial Banks - 9.9% Banesto Holdings, Ltd. Series A, 10.50%   30,000   774,375
  Barclays Bank Plc, 8.125%   100,000   1,710,000
  First Republic Preferred Capital Corp., 7.25% 120,000   1,980,000
  HSBC USA, Inc. Series H, 6.50%   330,000   6,435,000
  Royal Bank of Scotland Group Plc Series L, 5.75% 10,000   85,000
  Royal Bank of Scotland Group Plc Series M, 6.40% 10,000   92,600
  Santander Finance Preferred SA Unipersonal, 6.50% 258,000   4,386,000
  Santander Finance Preferred SA Unipersonal, 6.80% 85,000   1,402,500
  Union Planter Preferred Funding Corp., 7.75% (a) 60   2,400,000
  Wachovia Corp. Series J, 8%   84,700   707,245
          19,972,720
Diversified Financial Bank of America Corp. Series H, 8.20%   140,000   3,185,000
Services - 6.5% Citigroup, Inc. Series AA, 8.125%   245,000   4,042,500
  Citigroup, Inc. Series T, 6.50% (g)   65,000   2,665,000
  JPMorgan Chase & Co. Series E, 6.15%   75,000   2,947,500
          12,840,000
Electric Utilities - 0.6% Alabama Power Co., 6.50%   50,000   1,225,000
Insurance - 10.1% Arch Capital Group Ltd. Series A, 8%   117,414   2,383,504
  Aspen Insurance Holdings Ltd., 7.401% (c) 115,000   1,633,000
  Endurance Specialty Holdings Ltd. Series A, 7.75% 172,400   2,413,600
  MetLife, Inc. Series B, 6.50%   314,500   4,881,040
  PartnerRe Ltd. Series C, 6.75%   209,400   3,402,750
  Prudential Plc, 6.50%   62,000   669,600

3

BlackRock Preferred Opportunity Trust        
Schedule of Investments September 30, 2008 (Unaudited) (Percentages shown are based on Net Assets)
Industry Preferred Stocks   Shares   Value
  RenaissanceRe Holding Ltd. Series D, 6.60% 210,000   $3,049,200
  Zurich RegCaPS Funding Trust, 6.58% (a)(c) 2,000   1,873,750
          20,306,444
Real Estate Investment Trusts BRE Properties, Inc. Series D, 6.75%   20,000   356,400
(REITs) - 2.9% Public Storage Series F, 6.45%   20,000   318,800
  Public Storage Series M, 6.625%   35,000   612,500
  SunTrust Real Estate Investment Trust, 9% 30   2,810,625
  Weingarten Realty Investors Series F, 6.50% 95,000   1,710,000
          5,808,325
  Total Preferred Stocks - 30.0%       60,154,666
      Par    
  Trust Preferreds   (000)    
Capital Markets - 1.8% Deutsche Bank Contingent Capital Trust V,      
  8.05% (b) USD 2,063   1,666,044
  Structured Asset Trust Unit Repackagings (SATURNS),        
  Credit Suisse First Boston (USA), Inc. Debenture Backed      
  Series 2003-13, 6.25%, 7/15/32   277   149,615
  Structured Asset Trust Unit Repackagings (SATURNS),        
  Goldman Sachs Group, Inc. Debenture Backed Series 2003-      
  06, 6%, 2/15/33   2,572   1,755,312
          3,570,971
Commercial Banks - 0.4% Keycorp Capital V, 5.875%, 7/30/33   2,550   794,446
Diversified Financial Services - PPLUS Trust Certificates Series VAL-1 Class A, 7.25%,      
0.1% 4/15/32   278   259,330
Food Products - 1.0% Corporate-Backed Trust Certificates, Kraft Foods, Inc.      
  Debenture Backed Series 2003-11, 5.875%, 11/01/31 2,500   2,023,935
Insurance - 1.4% Everest Re Capital Trust, 6.20%, 3/29/34 750   427,374
  Financial Security Assurance Holdings Ltd., 5.60%,        
  7/15/03   380   76,658
  ING Groep NV, 7.20% (b)   1,750   950,859
  PLC Capital Trust IV, 7.25%, 9/25/32   460   250,240
  The Phoenix Cos., Inc., 7.45%, 1/15/32 1,985   1,123,365
          2,828,496
Media - 4.6% Comcast Corp., 7%, 9/15/55   1,250   956,135
  Comcast Corp., 6.625%, 5/15/56   11,750   8,219,580
  Corporate-Backed Trust Certificates, News America        
  Debenture Backed Series 2002-9, 8.125%, 12/01/45 180   124,805
          9,300,520
Oil, Gas & Consumable Fuels - Nexen, Inc., 7.35%, 11/01/43   3,875   3,099,289
1.5%          
Thrifts & Mortgage Finance - 2.1% Countrywide Capital V, 7%, 11/01/66   750   229,798
  Countrywide Financial Corp., 6.75%, 4/01/33 10,900   3,882,399
          4,112,197

4

BlackRock Preferred Opportunity Trust          
Schedule of Investments September 30, 2008 (Unaudited) (Percentages shown are based on Net Assets)
      Par      
  Short-Term Securities   (000)   Value  
Wireless Telecommunication Structured Repackaged Asset-Backed Trust          
Services - 0.6% Securities, Sprint Capital Corp. Debenture Backed          
  Series 2004-2, 6.50%, 11/15/28 USD 2,586   $1,215,016  
  Total Trust Preferreds - 13.5%       27,204,200  
  Total Long-Term Investments          
  (Cost - $488,033,828) - 164.9%       331,300,233  
U.S. Government Federal Home Loan Banks, 1.85%, 10/01/08   31,700   31,700,000  
Obligations (i) - 27.8% Federal Home Loan Banks, 0.75%, 10/09/08   13,900   13,897,683  
  Federal Home Loan Banks, 2.05%, 10/17/08   1,000   999,089  
  Freddie Mac Discount Notes, 2.09%, 11/04/08 (h)   4,000   3,992,256  
  Freddie Mac, 2.38%, 11/17/08   5,200   5,184,182  
  Total Short-Term Securities          
  (Cost - $55,773,210) - 27.8%       55,773,210  
  Total Investments          
  (Cost - $543,807,038*) - 192.7%       387,073,443  
  Liabilities in Excess of Other Assets - (37.7)%       (75,684,387 )
  Preferred Shares, at Redemption Value - (55.0)%       (110,488,562 )
  Net Assets Applicable to Common Shares - 100.0%       $200,900,494  

*   The cost and unrealized appreciation (depreciation) of investments as of September 30, 2008, as computed for federal income tax purposes, were as follows:

Aggregate cost $ 544,062,857
Gross unrealized appreciation $ 1,375,227
Gross unrealized depreciation   (158,364,641)
Net unrealized depreciation $ (156,989,414)

(a)   Security exempt from registration under Rule 144A of the Securities Act of 1933. These securities may be resold in transactions exempt from registration to qualified institutional investors.
(b)   Security is a perpetual in nature and has no stated maturity date.
(c)   Variable rate security. Rate shown is as of report date.
(d)   All or a portion of security, pledged as collateral for reverse repurchase agreements.

  Interest Trade Maturity Net Closing   Face
Counterparty Rate Date Date     Amount   Value
Barclay's Bank Plc 3.565 % 9/05/08 5/15/09 $ 18,656,625   $ 18,209,422
Barclay's Bank Plc 3.565 % 9/04/08 5/15/09 10,532,126   10,278,675
Barclay's Bank Plc 3.564 % 9/03/08 5/15/09 16,298,503   15,901,812
Barclay's Bank Plc 3.564 % 9/25/08 5/15/09 3,698,024   3,615,000
Barclay's Bank Plc 3.564 % 9/25/08 5/15/09 10,749,744   10,509,421
Barclay's Bank Plc 3.565 % 9/25/08 5/15/09 19,624,870   19,185,982
Barclay's Bank Plc 3.565 % 9/25/08 5/15/09 12,653,967   12,370,976
Total       $ 92,213,859   $ 90,071,288

(e)   Non-income producing security.
(f)   Issuer filed for bankruptcy or is in default of interest payments.
(g)   Convertible security.
(h)   All or a portion of security, pledged as collateral in connection with open financial future contracts.
(i)   Rate shown is the yield to maturity as of the date of purchase.

5

BlackRock Preferred Opportunity Trust
Schedule of Investments September 30, 2008 (Unaudited)

•   Financial futures contracts purchased as of September 30, 2008 were as follows:
      Expiration   Unrealized
  Contracts Issue Date Face Value Depreciation
  307 2-Year U.S.      
    Treasury Bond December 2008
$          65,981,764
$           (456,452)

• Financial futures contracts sold as of September 30, 2008 were as follows:
      Expiration   Unrealized
  Contracts Issue Date Face Value Depreciation
  494 5-Year U.S.      
    Treasury Bond December 2008 $          55,124,859
$           (318,922)

• Swaps outstanding as of September 30, 2008 were as follows:
        Notional   Unrealized
        Amount   Appreciation
        (000)   (Depreciation)
  Bought credit default protection on Dow Jones          
  CDX North America Investment Grade Index          
  Series 10 Volume 2 and pay 1.55%          
 
  Broker, Deutsche Bank Securities Inc.          
  Expires June 2013 USD   8,300     $          (51,601)  
 
  Bought credit default protection on Itraxx FinSub          
  Series 9 Volume 1 and pay 2.90%          
 
  Broker, Deutsche Bank Securities Inc.          
  Expires June 2013 EUR   4,000     27,757  
 
  Bought credit default protection on Itraxx Euro          
  Series 9 Volume 1 and receive 1.65%          
 
  Broker, Deutsche Bank Securities Inc.          
  Expires June 2013 EUR   4,000     (159,454)  
 
  Bought credit default protection on Itraxx FinSub          
  Series 9 Volume 1 and pay 2.90%          
 
  Broker, Deutsche Bank Securities Inc.          
  Expires June 2013 EUR   4,000     (82,327)  
   
  Bought credit default protection on Dow Jones          
  CDX North America Investment Grade Index          
  Class 10 Volume 2 and pay 1.55%          
 
  Broker, Deutsche Bank Securities Inc.          
  Expires June 2013 USD   8,300     (171,827)  

6

BlackRock Preferred Opportunity Trust
Schedule of Investments September 30, 2008 (Unaudited)

      Notional      
      Amount     Unrealized
      (000)     Depreciation
  Bought credit default protection on Mack-Cali          
  Realty, L.P. and pay 3.10%          
 
  Broker, Goldman Sachs & Co.          
  Expires March 2018 USD               1,000   $ (35,706)
  Bought credit default protection on ERP Operating          
  Limited Partnership and pay 2.35%          
 
  Broker, Goldman Sachs & Co.          
  Expires March 2018 USD               3,000     (9,882)
  Total       $ (483,040)

• Foreign currency exchange contracts purchased as of September 30, 2008 were as follows:
           
Unrealized
          Settlement
Appreciation
    Currency Purchased Currency Sold Date
(Depreciation)
  EUR 244,600 USD 357,874 10/23/08 $ (12,662
)
  USD 250,345 EUR 173,500 10/23/08   5,479  
      Total         $ (7,183
)

• Currency Abbreviations:
  EUR Euro
  USD U.S. Dollar

7

BlackRock Preferred Opportunity Trust
Schedule of Investments September 30, 2008 (Unaudited)

  • Effective January 1, 2008, the Trust adopted Financial Accounting Standards Board Statement of Financial Accounting Standards No. 157, "Fair Value Measurements" ("FAS 157"). FAS 157 clarifies the definition of fair value, establishes a framework for measuring fair values and requires additional disclosures about the use of fair value measurements. Various inputs are used in determining the fair value of investments, which are as follows:

  • Level 1 - price quotations in active markets/exchanges for identical securities

  • Level 2 - other observable inputs (including, but not limited to: quoted prices for similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the assets or liabilities (such as interest rates, yield curves, volatilities, prepayment speeds, loss severities, credit risks, and default rates) or other market-corroborated inputs)

  • Level 3 - unobservable inputs based on the best information available in the circumstance, to the extent observable inputs are not available (including the Trust's own assumption used in determining the fair value of investments)

The inputs or methodology used for valuing securities are not necessarily an indication of the risk associated with investing in those securities. For information about the Trust's policy regarding valuation of investments and other significant accounting policies, please refer to the Trust's most recent financial statements as contained in its semi-annual report.

The following table summarizes the inputs used as of September 30, 2008 in determining the fair valuation of the Trust's investments:

Valuation   Investments in   Other Financial  
Inputs   Securities   Instruments*  
Level 1 $ 62,965,367 $ (775,374
)
Level 2   324,108,076   (490,223
)
Level 3   -   -  
Total $ 387,073,443 $ (1,265,597
)

* Other financial instruments are swaps, futures and options.

8

Item 2 – Controls and Procedures

2(a) –   The registrant’s principal executive and principal financial officers or persons performing similar functions have concluded that the registrant’s disclosure controls and procedures (as defined in Rule 30a-3(c) under the Investment Company Act of 1940, as amended (the “1940 Act”)) are effective as of a date within 90 days of the filing of this report based on the evaluation of these controls and procedures required by Rule 30a-3(b) under the 1940 Act and Rule 13a-15(b) under the Securities Exchange Act of 1934, as amended.
 
2(b) –   There were no changes in the registrant’s internal control over financial reporting (as defined in Rule 30a-3(d) under the 1940 Act) that occurred during the registrant’s last fiscal quarter that have materially affected, or are reasonably likely to materially affect, the registrant’s internal control over financial reporting.

Item 3 – Exhibits

Certifications – Attached hereto

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.

BlackRock Preferred Opportunity Trust
   
By:
/s/ Donald C. Burke
  Donald C. Burke
  Chief Executive Officer of
  BlackRock Preferred Opportunity Trust
   
  Date: November 24, 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/ Donald C. Burke
  Donald C. Burke
  Chief Executive Officer (principal executive officer) of
  BlackRock Preferred Opportunity Trust
   
  Date: November 24, 2008
   
By:
/s/ Neal J. Andrews
  Neal J. Andrews
  Chief Financial Officer (principal financial officer) of
  BlackRock Preferred Opportunity Trust
   
  Date: November 24, 2008

Blackrock Credit Allocation Income Trust Iii (NYSE:BPP)
Historical Stock Chart
From Jun 2024 to Jul 2024 Click Here for more Blackrock Credit Allocation Income Trust Iii Charts.
Blackrock Credit Allocation Income Trust Iii (NYSE:BPP)
Historical Stock Chart
From Jul 2023 to Jul 2024 Click Here for more Blackrock Credit Allocation Income Trust Iii Charts.