Edgar Filing: Flaherty & Crumrine PREFERRED INCOME OPPORTUNITY FUND INC

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 811-06495
----------------------------

FLAHERTY & CRUMRINE PREFERRED INCOME OPPORTUNITY FUND INCORPORATED
--------------------------------------------------------------------------------
(Exact name of registrant as specified in charter)

301 E. Colorado Boulevard, Suite 720
PASADENA, CA 91101
--------------------------------------------------------------------------------
(Address of principal executive offices) (Zip code)

Donald F. Crumrine
Flaherty & Crumrine Incorporated
301 E. Colorado Boulevard, Suite 720
PASADENA, CA 91101
--------------------------------------------------------------------------------
(Name and address of agent for service)

Registrant's telephone number, including area code: 626-795-7300
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Date of fiscal year end: NOVEMBER 30, 2006
------------------

Date of reporting period: FEBRUARY 28, 2006
------------------

Form N-Q is to be used by management investment companies, other than small
business investment companies registered on Form N-5 (ss.ss. 239.24 and 274.5 of
this chapter), to file reports with the Commission, not later than 60 days after
the close of the first and third fiscal quarters, pursuant to rule 30b1-5 under
the Investment Company Act of 1940 (17 CFR 270.30b1-5). The Commission may use
the information provided on Form N-Q in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q, and
the Commission will make this information public. A registrant is not required
to respond to the collection of information contained in Form N-Q unless the
Form displays a currently valid Office of Management and Budget ("OMB") control
number. Please direct comments concerning the accuracy of the information
collection burden estimate and any suggestions for reducing the burden to the
Secretary, Securities and Exchange Commission, 100 F Street, NE, Washington, DC
20549. The OMB has reviewed this collection of information under the clearance
requirements of 44 U.S.C. ss. 3507.

ITEM 1. SCHEDULE OF INVESTMENTS.
The Schedule(s) of Investments is attached herewith.

FLAHERTY & CRUMRINE PREFERRED INCOME OPPORTUNITY FUND

To the Shareholders of the Flaherty & Crumrine Preferred Income Opportunity Fund
("PFO"):

The first fiscal quarter of 2006 was a mixed bag for PFO. On the plus
side, for the three-month period ended February 28, 2006, the Fund produced a
total return on net asset value of +3.7%. Despite this strong investment
performance, net income available to shareholders has declined, and the Fund
reduced its monthly dividend by 7.8% (from $0.0705/share to $0.065/share),
beginning with the March distribution. The focus of the Fund is income, so the
decision to reduce the dividend was difficult, but necessary.

The total return calculation mentioned above has two basic components--net
income earned and the change in principal value. Recently, the latter has done
well while the former has come under some pressure.

Net income earned, the amount of investment income left over after payment
on the Fund's Money Market Preferred ("MMP(R)") shares and other expenses, is
what the Fund can pay out in monthly distributions to common shareholders.
Although investment income has increased recently, payments to MMP(R) shares
have risen at a faster pace. As a result, the Fund could not continue to
distribute common dividends at the same rate.

The MMP(R) rate is closely correlated to other short-term interest rates,
all of which have moved up in concert with the Federal Reserve's efforts to
influence the pace of economic activity. The MMP(R) rate has risen from a low of
1.05% in May 2004 to 3.70% in March 2006. Despite this jump in rates, the use of
MMP(R) leverage continues to add incremental income for common shares because
the money we obtain from leverage is being invested in securities with much
higher yields.

The other component of total return, principal change, normally is not
distributed to common shareholders, but instead is reflected by changes in the
Fund's net asset value. During the fiscal period, the Fund's NAV rose 2.0%.

One last comment on total return--whatever the breakdown between net
income and principal change, the entire amount belongs to common shareholders.
In addition, the two tend to "merge" over time. For example, if principal value
increases and the Fund can realize gains, the Fund will have more money to
invest and can generate additional income. Or, shareholders can use the income
they receive to purchase additional shares via the Dividend Reinvestment Plan to
increase the value of their investment.

As readers may recall from previous discussions of market conditions, the
preferred securities market has two main segments--issues that pay dividends and
those that pay interest. We refer to the first type as "traditional" preferred
stock and the second as "hybrid" preferred securities.

Investor demand for traditional preferred stock has been consistently
strong for some time now; however new issue supply has not kept up--during the
last fiscal quarter there were only two new issues, totaling a meager $300
million. As a result of this imbalance, this segment has slowly and steadily
outperformed other types of fixed-income securities. The solid performance of
PFO reflects the portfolio's emphasis on traditional preferred stock.

Although demand for hybrid securities has also been strong for some time,
the supply of new hybrid preferred has greatly exceeded the supply of
traditional preferred. During the period there were thirty new hybrid issues
with a market value of $13.2 BILLION. As expected, many of these new issues were
structured like the "ECAP" issues we discussed in our last letter (and on the
Fund's website). Even with this sizable amount of new supply, the performance of
this segment kept pace with most other types of fixed-income securities during
the quarter.

Many of the recent hybrid preferred securities have terms and features
that require very close scrutiny. While the basic structure of the enhanced
capital security is now fairly well established, with each new issue we are
observing small but important differences. This evolutionary process is typical
of new structures--our job is to dissect each issue until we fully understand
every twist and turn.

The Fund's hedge positions are intended to provide shareholders with some
protection against significant increases in long-term interest rates. Over the
course of the fiscal quarter, long-term interest rates barely moved, so the
hedging strategy had little impact on the Fund's performance. The Fund's hedging
strategy did benefit from the "flat" U.S. Treasury yield curve, since the cost
of our hedges tends to be lower in this environment.

We hope investors will take advantage of the Fund's website,
WWW.PREFERREDINCOME.COM. It contains a wide range of useful and up-to-date
information about the Fund. In addition, some of the topics mentioned above are
analyzed in greater depth in the Frequently Asked Questions section of the
website.

Sincerely,

/s/ Donald F. Crumrine /s/ Robert M. Ettinger

Donald F. Crumrine Robert M. Ettinger
Chairman of the Board President

April 17, 2006

--------------------------------------------------------------------------------

Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
PORTFOLIO OVERVIEW
FEBRUARY 28, 2006 (UNAUDITED)
------------------------------------------------------------------

FUND STATISTICS ON 2/28/06
--------------------------------------------------------------------------------
Net Asset Value $ 12.38
Market Price $ 12.39
Premium 0.08%
Yield on Market Price 6.83%
Common Shares Outstanding 11,685,484

MOODY'S RATINGS % OF PORTFOLIO
--------------------------------------------------------------------------------
AAA 1.3%
AA 0.4%
A 18.3%
BBB 49.2%
BB 18.9%
Not Rated 10.8%
--------------------------------------------------------------------------------
Below Investment Grade* 20.2%

* BELOW INVESTMENT GRADE BY BOTH MOODY'S AND S&P.

[THE FOLLOWING TABLE WAS REPRESENTED BY A PIE CHART IN THE PRINTED MATERIAL.]

INDUSTRY CATEGORIES % OF PORTFOLIO
--------------------------------------------------------------------------------
Utilities 39%
Banks 23%
Insurance 13%
Financial Services 11%
Oil and Gas 6%
REITs 5%
Other 3%

TOP 10 HOLDINGS BY ISSUER % OF PORTFOLIO
--------------------------------------------------------------------------------
Interstate Power 5.3%
Entergy Louisiana 4.1%
Lehman Brothers 3.9%
Xcel Energy 3.8%
Principal Financial Group 3.5%
Alabama Power 3.1%
EOG Resources 3.0%
Cobank 3.0%
North Fork Bancorporation 2.9%
UnumProvident 2.6%

% OF PORTFOLIO**
-------------------------------------------------------------------------------------------------------------

Holdings Generating Qualified Dividend Income (QDI) for Individuals 71%
Holdings Generating Income Eligible for the Corporate Dividend Received Deduction (DRD) 68%
-------------------------------------------------------------------------------------------------------------

** THIS DOES NOT REFLECT YEAR-END RESULTS OR ACTUAL TAX CATEGORIZATION OF
FUND DISTRIBUTIONS. THESE PERCENTAGES CAN, AND DO, CHANGE, PERHAPS
SIGNIFICANTLY, DEPENDING ON MARKET CONDITIONS. INVESTORS SHOULD CONSULT
THEIR TAX ADVISOR REGARDING THEIR PERSONAL SITUATION.

--------------------------------------------------------------------------------

Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
PORTFOLIO OF INVESTMENTS
FEBRUARY 28, 2006 (UNAUDITED)
------------------------------------------------------------------

SHARES/$ PAR VALUE
-------------- -------

PREFERRED SECURITIES -- 95.8%
BANKING -- 22.0%
-------------------------------------------------------------------------------------------------------------------------
$ 3,000,000 Astoria Capital Trust I, 9.75% 11/01/29 Capital Security, Series B ................ $ 3,520,410
$ 250,000 Chase Capital I, 7.67% 12/01/26 Capital Security .................................. 263,605
Cobank, ACB:
45,000 7.00% Pfd., 144A**** ............................................................ 2,334,825*
75,000 Adj. Rate Pfd., 144A**** ........................................................ 4,110,000*
$ 500,000 Comerica (Imperial) Capital Trust I, 9.98% 12/31/26 Capital Security, Series B .... 553,162
4,500 FBOP Corporation, Adj. Rate Pfd., 144A**** ........................................ 4,533,750*
$ 2,250,000 First Hawaiian Capital I, 8.343% 07/01/27 Capital Security, Series B .............. 2,417,096(1)
First Republic Bank:
200,000 6.25% Pfd. ...................................................................... 4,944,000*
5,000 6.70% Pfd. ...................................................................... 128,075*
$ 4,349,000 GreenPoint Capital Trust I, 9.10% 06/01/27 Capital Security ....................... 4,724,514
$ 3,500,000 HBOS Capital Funding LP, 6.85% Pfd. ............................................... 3,533,758(1)
5,000 HSBC Series II, Variable Inverse Pfd., Pvt. ....................................... 5,450,000*
1,145 J.P. Morgan Chase & Co., 6.625% Pfd., Series H .................................... 58,017*
$ 1,350,000 Keycorp Institutional Capital B, 8.25% 12/15/26 Capital Security .................. 1,433,268
$ 1,500,000 North Fork Capital Trust I, 8.70% 12/15/26 Capital Security ....................... 1,598,768
16,000 PFGI Capital Corporation, 7.75% Pfd. .............................................. 425,280
$ 1,700,000 RBS Capital Trust B, 6.80% Pfd. ................................................... 1,718,734**(1)
10 Roslyn Real Estate, 8.95% Pfd., Series C, 144A**** ................................ 1,112,685
33,800 USB Capital VIII, 6.35% Pfd., 12/29/65 ............................................ 856,154
$ 3,500,000 Washington Mutual Preferred Funding, Variable Rate Pfd. 03/29/49, 144A**** ........ 3,459,470
--------------------------------------------------------------------------------------------------------------------
47,175,571
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FINANCIAL SERVICES -- 10.9%
-------------------------------------------------------------------------------------------------------------------------
141,000 CIT Group, Inc., 6.35% Pfd., Series A ............................................. 3,701,955*
53,500 Goldman Sachs Group, Inc., 6.20% Pfd., Series B ................................... 1,399,025*
Lehman Brothers Holdings, Inc.:
5,150 5.67% Pfd., Series D ............................................................ 261,543*
159,505 5.94% Pfd., Series C ............................................................ 8,185,796*
3,000 Merrill Lynch Series II STRIPES Custodial Receipts, Pvt. .......................... 3,120,000*
60,000 Morgan Stanley Capital Trust VI, 6.60% Pfd. ....................................... 1,520,400
94,150 SLM Corporation, 6.97% Pfd., Series A ............................................. 5,244,155*
--------------------------------------------------------------------------------------------------------------------
23,432,874
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INSURANCE -- 12.6%
-------------------------------------------------------------------------------------------------------------------------
20,000 ACE Ltd., 7.80% Pfd., Series C .................................................... 522,800**(1)
Aegon NV:
25,000 6.375% Pfd. ..................................................................... 633,500**(1)
25,000 6.50% Pfd. ...................................................................... 631,000**(1)

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Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
PORTFOLIO OF INVESTMENTS (CONTINUED)
FEBRUARY 28, 2006 (UNAUDITED)
------------------------------------------------------------------

SHARES/$ PAR VALUE
-------------- -------

PREFERRED SECURITIES -- (CONTINUED)
INSURANCE -- (CONTINUED)
-------------------------------------------------------------------------------------------------------------------------
29,750 Arch Capital Group Ltd., 8.00% Pfd. ............................................... $ 756,691**(1)
Axis Capital Holdings:
22,850 7.25% Pfd., Series A ............................................................ 575,249**(1)
9,300 Variable Rate Pfd., Series B .................................................... 958,597(1)
16,000 Berkley W.R. Capital Trust II, 6.75% 07/26/45 ..................................... 399,280
22,000 Endurance Specialty Holdings, 7.75% Pfd. .......................................... 551,980**(1)
15,850 Everest Re Capital Trust II, 6.20% Pfd., Series B ................................. 371,128(1)
140,000 MetLife Inc., 6.50% Pfd., Series B ................................................ 3,677,100*
275,000 Principal Financial Group, 6.518% Pfd. ............................................ 7,585,875*
$ 5,734,000 Provident Financing Trust I, 7.405% 03/15/38 Capital Security ..................... 5,664,189
Renaissancere Holdings:
6,000 7.30% Pfd., Series B ............................................................ 151,410**(1)
5,000 8.10% Pfd., Series A ............................................................ 125,900**(1)
123,000 Scottish Re Group Ltd., 7.25% Pfd. ................................................ 3,137,115**(1)
$ 560,000 USF&G Capital, 8.312% 07/01/46 Capital Security, 144A**** ......................... 710,511
22,850 XL Capital Ltd., 8.00% Pfd. Series A .............................................. 594,100**(1)
--------------------------------------------------------------------------------------------------------------------
27,046,425
-------------
UTILITIES -- 39.0%
-------------------------------------------------------------------------------------------------------------------------
Alabama Power Company:
4,980 4.60% Pfd. ...................................................................... 440,605*
6,485 4.72% Pfd. ...................................................................... 588,741*
868 4.92% Pfd. ...................................................................... 82,139*
225,000 5.30% Pfd. ...................................................................... 5,601,375*
6,000 Baltimore Gas & Electric Company, 6.70% Pfd., Series 1993 ......................... 623,610*
1,628 Central Hudson Gas & Electric Corporation, 4.35% Pfd., Series D, Pvt. ............. 142,369*
3,798 Central Maine Power Company, 4.75% Pfd. ........................................... 342,883*
11,119 Central Vermont Public Service Corporation, 8.30% Sinking Fund Pfd., Pvt. ......... 1,154,541*
Connecticut Light & Power Company:
2,050 4.50% Pfd., Series 1956 ......................................................... 83,691*
25,000 5.28% Pfd., Series 1967 ......................................................... 1,202,875*
883 $2.04 Pfd., Series 1949 ......................................................... 32,689*
2,900 $2.20 Pfd., Series 1949 ......................................................... 115,768*
9,652 $3.24 Pfd. ...................................................................... 504,848*
2,000 Consolidated Edison Company of New York, 4.65% Pfd., Series C ..................... 179,930*
7,500 Dayton Power and Light Company, 3.90% Pfd., Series C .............................. 509,700*

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SHARES/$ PAR VALUE
-------------- -------

PREFERRED SECURITIES -- (CONTINUED)
UTILITIES -- (CONTINUED)
-------------------------------------------------------------------------------------------------------------------------
$ 1,500,000 Dominion Resources Capital Trust III, 8.40% 01/15/31 .............................. $ 1,800,082
Duquesne Light Company:
15,030 3.75% Pfd. ...................................................................... 495,990*
25,775 6.50% Pfd. ...................................................................... 1,333,856*
5,000 Energy East Capital Trust I, 8.25% Pfd. ........................................... 127,400
Entergy Arkansas, Inc.:
2,840 4.56% Pfd. ...................................................................... 242,465*
3,050 4.56% Pfd., Series 1965 ......................................................... 260,394*
1,435 6.08% Pfd. ...................................................................... 141,412*
1,141 7.32% Pfd. ...................................................................... 118,932*
14,625 7.40% Pfd. ...................................................................... 1,519,318*
6,388 7.80% Pfd. ...................................................................... 667,131*
2,588 7.88% Pfd. ...................................................................... 269,683*
25,536 $1.96 Pfd. ...................................................................... 639,038*
2,441 Entergy Gulf States, Inc., 7.56% Pfd. ............................................. 240,109*
Entergy Louisiana, Inc.:
299 5.16% Pfd. ...................................................................... 28,976*
943 6.44% Pfd. ...................................................................... 97,582*
36,000 6.95% Pfd., 144A**** ............................................................ 3,725,640*
4,174 7.36% Pfd. ...................................................................... 433,699*
175,000 8.00% Pfd., Series 92 ........................................................... 4,410,875*
Entergy Mississippi, Inc.:
4,616 4.36% Pfd. ...................................................................... 335,006*
5,000 4.92% Pfd. ...................................................................... 409,450*
2,000 Florida Power Company, 4.75% Pfd. ................................................. 188,660*
Great Plains Energy, Inc.:
1,625 4.20% Pfd. ...................................................................... 129,114*
2,000 4.35% Pfd. ...................................................................... 164,590*
24,000 Gulf Power Company, 6.00% Pfd., Series 1 .......................................... 2,490,480*
Hawaiian Electric Company, Inc.:
2,471 5.00% Pfd., Series D ............................................................ 46,949*
7,438 5.00% Pfd., Series E ............................................................ 141,322*
1,383 5.00% Pfd., Series I ............................................................ 26,277*
$ 3,750,000 Houston Light & Power Capital Trust II, 8.257% 02/01/37 Capital Security .......... 3,973,781
30,500 Indianapolis Power & Light Company, 5.65% Pfd. .................................... 2,929,067*
340,000 Interstate Power & Light Company, 8.375% Pfd., Series B ........................... 11,316,900*
200 Narragansett Electric Company, 4.64% Pfd. ......................................... 9,424*
2,588 New York State Electric & Gas, $4.50 Pfd., Series 1949 ............................ 226,605*

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SHARES/$ PAR VALUE
-------------- -------

PREFERRED SECURITIES -- (CONTINUED)
UTILITIES -- (CONTINUED)
-------------------------------------------------------------------------------------------------------------------------
12,265 Northern Indiana Public Service Company, Adj. Rate Pfd., Series A ................. $ 616,316*
Ohio Power Company:
3,018 4.20% Pfd. ...................................................................... 251,475*
1,251 4.40% Pfd. ...................................................................... 109,206*
Pacific Enterprises:
13,680 $4.36 Pfd. ...................................................................... 1,157,123*
24,985 $4.50 Pfd. ...................................................................... 2,181,191*
15,730 $4.75 Pfd., Series 53 ........................................................... 1,449,520*
Pacific Gas & Electric Co.:
7,600 4.50% Pfd., Series H ............................................................ 151,924*
41,500 5.00% Pfd., Series D ............................................................ 882,913*
83,000 5.00% Pfd., Series E ............................................................ 1,827,245*
PacifiCorp:
5,672 $4.56 Pfd. ...................................................................... 476,987*
6,708 $4.72 Pfd. ...................................................................... 583,898*
10,500 $7.48 Sinking Fund Pfd. ......................................................... 1,079,873*
1,250 PECO Energy Company, $4.30 Pfd., Series B ......................................... 102,206*
15,142 Portland General Electric, 7.75% Sinking Fund Pfd. ................................ 1,556,370*
14,020 Public Service Electric & Gas Company, 5.28% Pfd., Series E ....................... 1,399,196*
70,210 San Diego Gas & Electric Company, $1.70 Pfd. ...................................... 1,820,545*
8,900 Savannah Electric & Gas Company, 6.00% Pfd. ....................................... 238,832*
South Carolina Electric & Gas Company:
14,226 5.125% Purchase Fund Pfd., Pvt. ................................................. 730,790*
7,774 6.00% Purchase Fund Pfd., Pvt. .................................................. 395,541*
Southern California Edison:
57,646 4.08% Pfd. ...................................................................... 1,102,480*
5,000 4.24% Pfd. ...................................................................... 97,550*
60,000 Southern Union Company, 7.55% Pfd. ................................................ 1,585,200*
$ 750,000 TXU Electric Capital V, 8.175% 01/30/37 Capital Security .......................... 792,109
5,700 Union Electric Company, 4.56% Pfd. ................................................ 517,047*
Virginia Electric & Power Company:
1,665 $4.04 Pfd. ...................................................................... 130,586*
2,470 $4.20 Pfd. ...................................................................... 201,404*
1,673 $4.80 Pfd. ...................................................................... 157,429*
2,878 $6.98 Pfd. ...................................................................... 295,326*
12,500 $7.05 Pfd. ...................................................................... 1,278,688*
11,200 Virginia Power Capital Trust, 7.375% Pfd. 07/30/42 ................................ 286,608
2,262 Washington Gas & Light Company, $4.25 Pfd. ........................................ 191,557*
12,863 Wisconsin Power & Light, 6.20% Pfd. ............................................... 1,318,136*

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SHARES/$ PAR VALUE
-------------- -------

PREFERRED SECURITIES -- (CONTINUED)
UTILITIES -- (CONTINUED)
-------------------------------------------------------------------------------------------------------------------------
Xcel Energy, Inc.:
15,000 $4.08 Pfd., Series B ............................................................ $ 1,226,850*
20,040 $4.10 Pfd., Series C ............................................................ 1,646,987*
35,510 $4.11 Pfd., Series D ............................................................ 2,925,669*
17,750 $4.16 Pfd., Series E ............................................................ 1,480,173*
10,000 $4.56 Pfd., Series G ............................................................ 914,100*
--------------------------------------------------------------------------------------------------------------------
83,705,021
-------------
OIL AND GAS -- 4.7%
-------------------------------------------------------------------------------------------------------------------------
8,000 Devon Energy Corporation, 6.49% Pfd., Series A .................................... 808,440*
6,125 EOG Resources, Inc., 7.195% Pfd., Series B ........................................ 6,446,624*
$ 1,650,000 KN Capital Trust III, 7.63% 04/15/28 Capital Security ............................. 1,838,719
10,000 Lasmo America Limited, 8.15% Pfd., 144A**** ....................................... 1,084,900*(1)
--------------------------------------------------------------------------------------------------------------------
10,178,683
-------------
REAL ESTATE INVESTMENT TRUST (REIT) -- 4.7%
-------------------------------------------------------------------------------------------------------------------------
31,000 AMB Property Corporation, 7.00% Pfd., REIT, Series O .............................. 788,020
20,000 BRE Properties, Inc., 6.75% Pfd., REIT, Series D .................................. 500,300
Duke Realty Corporation:
15,000 6.50% Pfd., REIT, Series K ...................................................... 369,375
20,000 6.625% Pfd., REIT, Series J ..................................................... 496,500
1,000 Equity Residential Properties, 8.29% Pfd., REIT, Series K ......................... 60,305
50,000 HRPT Properties Trust, 7.125% Pfd., REIT, Series C ................................ 1,252,750
PS Business Parks, Inc.:
10,000 7.00% Pfd., REIT, Series H ...................................................... 247,850
18,120 7.20% Pfd., REIT, Series M ...................................................... 447,292
Public Storage, Inc.:
11,100 6.18% Pfd., REIT, Series D ...................................................... 264,235
91,275 6.45% Pfd., REIT, Series F ...................................................... 2,221,177
22,500 6.75% Pfd., REIT, Series E ...................................................... 562,838
30,000 7.125% Pfd., REIT ............................................................... 778,650
40,000 Realty Income Corporation, 7.375% Pfd., REIT, Series D ............................ 1,032,400
Regency Centers Corporation:
6,000 6.70% Pfd., REIT ................................................................ 146,430
40,000 7.25% Pfd., REIT ................................................................ 1,004,600
--------------------------------------------------------------------------------------------------------------------
10,172,722
-------------

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SHARES/$ PAR VALUE
-------------- -------

PREFERRED SECURITIES -- (CONTINUED)
MISCELLANEOUS INDUSTRIES -- 1.9%
-------------------------------------------------------------------------------------------------------------------------
13,600 E.I. Du Pont de Nemours and Company, $4.50 Pfd., Series B ......................... $ 1,167,764*
35,000 Ocean Spray Cranberries, Inc., 6.25% Pfd., 144A**** ............................... 2,885,400*
26,000 Touch America Holdings, $6.875 Pfd. ............................................... --+*
--------------------------------------------------------------------------------------------------------------------
4,053,164
-------------
TOTAL PREFERRED SECURITIES
(Cost $190,728,413) ............................................................. 205,764,460
-------------
CORPORATE DEBT SECURITIES -- 1.7%
OIL AND GAS -- 1.2%
-------------------------------------------------------------------------------------------------------------------------
97,900 Nexen, Inc., 7.35% Subordinated Notes ............................................. 2,532,673(1)
-------------
UTILITIES -- 0.5%
-------------------------------------------------------------------------------------------------------------------------
$ 1,000,000 Duquesne Light Holdings, 6.25% 08/15/35 ........................................... 985,295
-------------
TOTAL CORPORATE DEBT SECURITIES
(Cost $3,552,363) ............................................................... 3,517,968
-------------
COMMON STOCK -- 0.9%
BANKING -- 0.9%
-------------------------------------------------------------------------------------------------------------------------
110,000 New York Community Bancorp, Inc. .................................................. 1,850,750*
--------------------------------------------------------------------------------------------------------------------
TOTAL COMMON STOCK
(Cost $1,917,807) ............................................................... 1,850,750
-------------
OPTION CONTRACTS -- 0.4%
210 April Put Options on June U.S. Treasury Bond Futures, Expiring 03/24/06 ........... 433,125+
355 June Put Options on June U.S. Treasury Bond Futures, Expiring 05/26/06 ............ 66,563+
810 June Put Options on June U.S. Treasury Bond Futures, Expiring 05/26/06 ............ 354,375+
--------------------------------------------------------------------------------------------------------------------
TOTAL OPTION CONTRACTS
(Cost $1,038,801) ............................................................... 854,063
-------------

--------------------------------------------------------------------------------

SHARES/$ PAR VALUE
-------------- -------

MONEY MARKET FUND -- 2.1%
4,561,767 BlackRock Provident Institutional, TempFund ....................................... $ 4,561,767
--------------------------------------------------------------------------------------------------------------------
TOTAL MONEY MARKET FUND
(Cost $4,561,767) ............................................................... 4,561,767
-------------

TOTAL INVESTMENTS (Cost $201,799,151***) ........................................... 100.9% 216,549,008
OTHER ASSETS AND LIABILITIES (Net) ................................................. (0.9)% (1,866,818)
-------- -------------
TOTAL NET ASSETS AVAILABLE TO COMMON AND PREFERRED STOCK ........................... 100.0%++ $ 214,682,190
-------- -------------
MONEY MARKET CUMULATIVE PREFERRED(TM) STOCK (MMP(R)) REDEMPTION VALUE ............................. (70,000,000)
-------------
TOTAL NET ASSETS AVAILABLE TO COMMON STOCK ........................................................ $ 144,682,190
=============

----------
* Securities eligible for the Dividends Received Deduction and distributing
Qualified Dividend Income.

** Securities distributing Qualified Dividend Income only.

*** Aggregate cost of securities held.

**** Securities 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 buyers. These securities have been
determined to be liquid under the guidelines established by the Board of
Directors.

(1) Foreign Issuer.

+ Non-income producing.

++ The percentage shown for each investment category is the total value of
that category as a percentage of net assets available to Common and
Preferred Stock.

ABBREVIATIONS:

REIT -- Real Estate Investment Trust

PFD. -- Preferred Securities

PVT. -- Private Placement Securities

--------------------------------------------------------------------------------

Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
STATEMENT OF CHANGES IN NET ASSETS AVAILABLE TO COMMON STOCK(1)
FOR THE PERIOD FROM DECEMBER 1, 2005 THROUGH FEBRUARY 28, 2006 (UNAUDITED)
--------------------------------------------------------------------------

VALUE
-------

OPERATIONS:
Net investment income .................................................... $ 2,767,201
Net realized gain/(loss) on investments sold during the period ........... 454,603
Change in net unrealized appreciation/depreciation of investments held
during the period .................................................... 2,715,029
Distributions to Money Market Cumulative Preferred(TM) Stock
Shareholders from net investment income, including changes in
accumulated undeclared distributions ................................. (610,216)
-------------
NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS ..................... 5,326,617

DISTRIBUTIONS:
Dividends paid from net investment income to Common Stock Shareholders (2) (2,470,225)
-------------
TOTAL DISTRIBUTIONS TO COMMON STOCK SHAREHOLDERS ......................... (2,470,225)

FUND SHARE TRANSACTIONS:
Increase from shares issued under the Dividend Reinvestment
and Cash Purchase Plan ............................................... 109,275
-------------
NET INCREASE IN NET ASSETS AVAILABLE TO COMMON STOCK RESULTING
FROM FUND SHARE TRANSACTIONS ........................................ 109,275

-------------
NET INCREASE IN NET ASSETS AVAILABLE TO COMMON STOCK
FOR THE PERIOD ........................................................... $ 2,965,667
=============

----------------------------------------------------------------------------------------------------
NET ASSETS AVAILABLE TO COMMON STOCK:
Beginning of period ...................................................... $ 141,716,523
Net increase in net assets during the period ............................. 2,965,667
-------------
End of period ............................................................ $ 144,682,190
=============

----------
(1) These tables summarize the three months ended February 28, 2006 and should
be read in conjunction with the Fund's audited financial statements,
including footnotes, in its Annual Report dated November 30, 2005.

(2) May include income earned, but not paid out, in prior fiscal year.

--------------------------------------------------------------------------------

Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
FINANCIAL HIGHLIGHTS(1)
FOR THE PERIOD FROM DECEMBER 1, 2005 THROUGH FEBRUARY 28, 2006 (UNAUDITED)
FOR A COMMON SHARE OUTSTANDING THROUGHOUT THE PERIOD.
-----------------------------------------------------

PER SHARE OPERATING PERFORMANCE:
Net asset value, beginning of period .................................................... $ 12.14
------------
INVESTMENT OPERATIONS:
Net investment income ................................................................... 0.24
Net realized and unrealized gain/(loss) on investments .................................. 0.26
DISTRIBUTIONS TO MMP(R)* SHAREHOLDERS:
From net investment income .............................................................. (0.05)
From net realized capital gains ......................................................... --
------------
Total from investment operations ........................................................ 0.45
------------
DISTRIBUTIONS TO COMMON STOCK SHAREHOLDERS:
From net investment income .............................................................. (0.21)
From net realized capital gains ......................................................... --
------------
Total distributions to Common Stock Shareholders ........................................ (0.21)
------------
Net asset value, end of period .......................................................... $ 12.38
============
Market value, end of period ............................................................. $ 12.39
============
Common shares outstanding, end of period ................................................ 11,685,484
============
RATIOS TO AVERAGE NET ASSETS AVAILABLE TO COMMON STOCK SHAREHOLDERS:
Net investment income + ................................................................. 6.02%**
Operating expenses ...................................................................... 1.56%**
-----------------------------------------
SUPPLEMENTAL DATA:++
Portfolio turnover rate ................................................................. 21%***
Total net assets available to Common and Preferred Stock, end of period (in 000's) ...... $ 214,682
Ratio of operating expenses to total average net assets available to
Common and Preferred Stock .......................................................... 1.04%**

(1) These tables summarize the three months ended February 28, 2006 and should
be read in conjunction with the Fund's audited financial statements,
including footnotes, in its Annual Report dated November 30, 2005.

* Money Market Cumulative Preferred(TM) Stock.

** Annualized.

*** Not Annualized.

+ The net investment income ratios reflect income net of operating expenses
and payments to MMP(R)* Shareholders.

++ Information presented under heading Supplemental Data includes MMP(R)*.
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
FINANCIAL HIGHLIGHTS (CONTINUED)
PER SHARE OF COMMON STOCK (UNAUDITED)
-------------------------------------

TOTAL DIVIDEND
DIVIDENDS NET ASSET NYSE REINVESTMENT
PAID VALUE CLOSING PRICE PRICE(1)
--------- --------- ------------- ------------
December 31, 2005 ..... $0.0705 $12.24 $11.09 $11.43
January 31, 2006 ...... 0.0705 12.28 12.63 12.28
February 28, 2006 ..... 0.0705 12.38 12.39 12.38

----------
(1) Whenever the net asset value per share of the Fund's Common Stock is less
than or equal to the market price per share on the payment date, new
shares issued will be valued at the higher of net asset value or 95% of
the then current market price. Otherwise, the reinvestment shares of
Common Stock will be purchased in the open market.

--------------------------------------------------------------------------------

Flaherty & Crumrine Preferred Income Opportunity Fund Incorporated
NOTES TO FINANCIAL STATEMENTS (UNAUDITED)
------------------------------------------------------------------

1. AGGREGATE INFORMATION FOR FEDERAL INCOME TAX PURPOSES

At February 28, 2006, the aggregate cost of securities for federal income
tax purposes was $201,624,995, the aggregate gross unrealized appreciation for
all securities in which there is an excess of value over tax cost was
$18,372,809 and the aggregate gross unrealized depreciation for all securities
in which there is an excess of tax cost over value was $3,448,796.

[This page intentionally left blank]

[LOGO] Flaherty & Crumrine
===================
PREFERRED INCOME
OPPORTUNITY FUND

Quarterly
Report

February 28, 2006

www.preferredincome.com

DIRECTORS

Donald F. Crumrine, CFA
Chairman of the Board
David Gale
Morgan Gust
Karen H. Hogan
Robert F. Wulf, CFA

OFFICERS

Donald F. Crumrine, CFA
Chief Executive Officer
Robert M. Ettinger, CFA
President
R. Eric Chadwick, CFA
Chief Financial Officer,
Vice President and Treasurer
Chad C. Conwell
Chief Compliance Officer,
Vice President and Secretary
Bradford S. Stone
Vice President and
Assistant Treasurer
Christopher D. Ryan, CFA
Vice President
Laurie C. Lodolo
Assistant Compliance Officer,
Assistant Treasurer and
Assistant Secretary

INVESTMENT ADVISER

Flaherty & Crumrine Incorporated
e-mail: flaherty@pfdincome.com

QUESTIONS CONCERNING YOUR SHARES OF FLAHERTY &
CRUMRINE PREFERRED INCOME OPPORTUNITY FUND?

o If your shares are held in a Brokerage
Account, contact your Broker.

o If you have physical possession of your shares
in certificate form, contact the Fund's Transfer
Agent & Shareholder Servicing Agent --

PFPC Inc.
P.O. Box 43027
Providence, RI 02940-3027
1-800-331-1710

THIS REPORT IS SENT TO SHAREHOLDERS OF FLAHERTY & CRUMRINE PREFERRED INCOME
OPPORTUNITY FUND INCORPORATED FOR THEIR INFORMATION. IT IS NOT A PROSPECTUS,
CIRCULAR OR REPRESENTATION INTENDED FOR USE IN THE PURCHASE OR SALE OF SHARES OF
THE FUND OR OF ANY SECURITIES MENTIONED IN THIS REPORT.

ITEM 2. CONTROLS AND PROCEDURES.

(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") (17 CFR 270.30a-3(c))) are effective, as of a date within
90 days of the filing date of the report that includes the disclosure
required by this paragraph, based on their evaluation of these controls
and procedures required by Rule 30a-3(b) under the 1940 Act (17 CFR
270.30a-3(b)) and Rules 13a-15(b) or 15d-15(b) under the Securities
Exchange Act of 1934, as amended (17 CFR 240.13a-15(b) or
240.15d-15(b)).

(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 (17
CFR 270.30a-3(d)) 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 pursuant to Rule 30a-2(a) under the 1940 Act and Section 302 of
the Sarbanes-Oxley Act of 2002 are attached hereto.

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.

(Registrant) FLAHERTY & CRUMRINE PREFERRED INCOME OPPORTUNITY FUND INCORPORATED
--------------------------------------------------------------------

By (Signature and Title)* /S/ DONALD F. CRUMRINE
-------------------------------------------------------
Donald F. Crumrine, Director, Chairman of the Board
and Chief Executive Officer
(principal executive officer)

Date APRIL 12, 2006
----------------------------------------------------------------------------

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.

Date APRIL 12, 2006
----------------------------------------------------------------------------

By (Signature and Title)* /S/ R. ERIC CHADWICK
-------------------------------------------------------
R. Eric Chadwick, Chief Financial Officer, Treasurer
and Vice President
(principal financial officer)

Date APRIL 12, 2006
----------------------------------------------------------------------------

* Print the name and title of each signing officer under his or her signature.