PREFERRED INCOME OPPORTUNITY FUND INC
N-30D, 1997-07-29
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<PAGE> 
PREFERRED INCOME OPPORTUNITY FUND 
INCORPORATED 
  
Dear Shareholder: 
  
    The Preferred Income Opportunity Fund had good results in its 
fiscal first 
half ended May 31, 1997, despite market conditions that were 
generally difficult 
for bond investors. Total return on net asset value ("NAV") was 
5.0% for the six 
months. The return on market price was 8.8%. This was slightly 
better as the 
discount of NAV from market narrowed further to approximately 3.6% 
at the end of 
our first half. 
  
    The Preferred Income Opportunity Fund is intended to be an 
alternative to 
higher quality bond funds for investors who want less exposure to 
fluctuating 
interest rates than is normally associated with fixed income 
investments. As the 
following table shows, it has proven to be a very good 
alternative. The Fund has 
outperformed, over time, almost all the funds in a group of up to 
60 higher 
quality closed-end bond funds compiled by Lipper Analytical 
Services, Inc. 
  
<TABLE> 
<S>                                                                   
<C>          <C>            <C> 
                                     TOTAL RETURNS EARNED ON NET 
ASSET VALUE 
                                              THROUGH MAY 31, 1997 
  
                                                                         
ONE YEAR      TWO YEARS      THREE YEARS 
                                                                      
- -----------  -------------  --------------- 
PREFERRED INCOME OPPORTUNITY FUND                                          
15.0%          12.9%            11.7% 
RANK VS. HIGHER QUALITY BOND FUNDS                                      
#3 OF 60       #5 OF 60         #2 OF 38 
</TABLE> 
  
  Source: Lipper Analytical Services, Inc. The comparison group 
includes all 
  U.S. Government bond, mortgage bond and term trust, and 
investment grade 
  bond funds in Lipper's closed-end fund database. 
  
    The Fund's performance has been aided recently by a bit of a 
tail wind. 
There has been a steady stream of redemptions of traditional 
preferred stocks, 
motivated by the tax benefits to issuers of refinancing with new 
forms of hybrid 
preferreds. As a result, preferred stocks eligible for the 
Dividends Received 
Deduction ("DRD") have become increasingly scarce, and their 
prices have been 
quite firm. Such issues make up the bulk of the Fund's portfolio. 
  
    As the prices of preferred stocks eligible for the DRD 
strengthened, we 
whittled down the Fund's holdings of such issues. The net 
reduction was focused 
on fixed rate preferreds, which now account for 50% of the 
portfolio, down from 
65% the year before. Adjustable rate preferred ("ARPs"), which 
seemed rather 
cheap at times last year, were increased to approximately 30% of 
the portfolio, 
compared to 25% twelve months earlier. This was good move since 
ARPs proved to 
be the Fund's star performers. 
  
    The cash from the net sales of preferreds eligible for the DRD 
was used to 
increase the Fund's holdings of hybrid preferreds to approximately 
17% of the 
portfolio, compared to 5% last year at this time. Most of the 
increase has 
occurred since the Federal Reserve Board's approval last October 
of the issuance 
of hybrids by banks. A surge of new issues of hybrids resulted 
from that action, 
which has produced more attractive yields for investors. 
<PAGE> 
EDGAR REPRESENTATION OF DATA POINTS USED IN PRINTED GRAPHIC 
  
<TABLE> 
<CAPTION> 
PORFOLIO COMPOSITION AS OF 
<S>                          <C> 
5/31/97 
Adjustable Rates                   30% 
Non-DRD Preferreds                 17% 
Traditional Fixed Rates            50% 
Cash & Other                        3% 
</TABLE> 
  
    The Question and Answer section that follows this letter goes 
into greater 
detail concerning the scarcity of traditional preferreds and the 
expanded role 
of hybrid preferreds in the Fund's portfolio. 
  
    The uncertainty about the tax laws that has been hanging over 
the preferred 
stock market may be starting to clear up a bit. As previously 
discussed in these 
letters, the Clinton Administration has proposed reducing and 
otherwise 
curtailing the DRD and also restricting hybrid preferreds in a 
number of ways. 
The recent budget agreement appears to put much of the 
responsibility for the 
details of the necessary tax legislation back in the hands of 
Congress. We are 
encouraged that the tax bill unveiled this June by the Chairman of 
the House 
Committee on Ways & Means does not contain any of the proposals 
that we 
previously found most disturbing. Just remember, in Washington, 
"It ain't over 
'til it's over." 
  
    On balance, the Fund's hedges have slightly reduced the 
returns earned in 
the current fiscal year to date. Although interest rates are up 
since the start 
of the year, they have not increased far enough or fast enough to 
overcome the 
cost of the hedge. The hedges did, however, help the stability of 
NAV as 
interest rates bounced around. This is similar to an insurance 
policy that costs 
you money but helps you sleep better. 
  
    Although many of our shareholders participate in the Fund's 
Dividend 
Reinvestment Plan, unceremoniously labeled the "DRIP," we suspect 
there are 
others who may have overlooked this opportunity. The DRIP allows 
shareholders to 
acquire additional shares of the Fund on a regular basis at very 
economical 
transaction costs and, in the current market, a discount from NAV. 
(See pages 
21-22 of this report for a detailed description of the DRIP.) 
Information about 
the plan is available through the Fund's Shareholder Servicing 
Agent, First Data 
Investor Services Group, Inc. at 1-800-331-1710. 
  
                                          Sincerely, 
  
                                                    [SIG] 
  
                                          Robert T. Flaherty 
                                          CHAIRMAN OF THE BOARD 
  
June 10, 1997 
  
                                       2 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                                                       QUESTION & 
ANSWER SECTION 
                                                        MAY 31, 
1997 (UNAUDITED) 
                                 ---------------------------------
- -------------- 
  
HOW LONG WILL THE SCARCITY OF TRADITIONAL PREFERRED STOCKS LAST? 
  
    We do not buy the notion that traditional preferreds, which 
are eligible for 
the Dividends Received Deduction (the "DRD"), will be totally 
replaced by hybrid 
preferreds. Ultimately, the two types of preferreds should coexist 
in the market 
place. As the saying goes, it's just a matter of price. 
  
    The current wave of redemptions of DRD eligible traditional 
preferreds has a 
lot of momentum. There are many such preferreds with dividend 
rates above 
current market levels that become redeemable for the first time 
this year. Many 
of the issuers of those traditional preferreds have already come 
to market with 
new hybrid preferreds for the obvious purpose of refinancing in 
advance their 
DRD eligible issues. Because of this, the scarcity of traditional 
preferreds 
will continue for a while and may become even more pronounced in 
the months 
ahead. 
  
    On a more basic level, the incentive, including tax benefits, 
for 
corporations to issue hybrids instead of traditional preferreds is 
gradually 
declining. The cost of financing with traditional preferreds has 
gotten 
noticeably cheaper, reflecting stronger prices and lower yields 
relative to 
hybrids. Furthermore, regulatory and credit rating considerations 
may encourage 
companies that already have several issues of hybrids outstanding 
to consider 
financing again with traditional preferreds in the future. Of 
course, we are 
assuming no dramatic change in the tax laws. 
  
    It will take time for this situation to shake out completely. 
New issue 
activity in traditional preferreds may recover slowly, but it is 
difficult to 
see in the next year or two any net growth in this sector after 
retirements. We 
expect the prices of traditional preferreds to remain well above 
what used to be 
"normal" as long as the hybrid market is thriving. 
  
WILL THE SCARCITY CAUSE TRADITIONAL PREFERREDS TO CONTINUE 
OVERPERFORMING 
  HYBRIDS? 
  
    There are limits to everything, even "overperformance" by 
traditional 
preferreds. For a higher rate issue, the price at which it can be 
redeemed by 
the issuer, either now or in the near future, is clearly a barrier 
on the 
upside. Similarly, even a traditional preferred that has a lower 
dividend rate 
or is not redeemable in the near future will eventually lose steam 
on the 
upside. Potentially, the highest bidder for such an issue is the 
issuer itself 
through a stock buyback program. Corporate investors could lose 
interest in 
supporting the market before that happened, however, if the market 
price rose 
enough to discount fully the tax advantage of the DRD. At that 
point, they would 
then be indifferent between owning the traditional preferred or a 
hybrid. 
  
    The potential performance of traditional preferreds varies 
from case to 
case. We have our eyes on the limits described above, even though 
many issues 
have not yet reached them. 
  
                                       3 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
QUESTION & ANSWER SECTION (CONTINUED) 
MAY 31, 1997 (UNAUDITED) 
- ----------------------------------------------- 
  
HAS THE FUND'S STRATEGY ON HYBRID PREFERREDS CHANGED? 
  
    Market conditions have been changing rapidly, and our strategy 
on hybrids 
has evolved in response to those changes. 
  
    When hybrids were first introduced over three years ago, it 
was easy. As a 
new gimmick, hybrids were relatively fully priced, and their 
yields were not 
very tempting. We saw a possible "creeping scarcity" of preferreds 
eligible for 
the DRD, which made traditional preferreds that much more 
attractive. Zero 
seemed like the right amount of dollars to put into hybrids, and 
that proved to 
be a very good decision. 
  
    A little over a year ago, hybrids became more interesting. 
They were coming 
to market so rapidly that bursts of new issues occasionally 
offered investors 
quite attractive yields. The hybrids purchased by the Fund proved 
to be only 
trading opportunities that were typically sold as soon as the 
market snapped 
back. Because of their increasing scarcity, traditional preferreds 
still seemed 
like the best place to be. That was another good decision. 
  
    An important "mid-course adjustment" occurred after the 
Federal Reserve 
Board determined last October that, subject to certain 
limitations, banks could 
issue hybrids to satisfy their capital requirements. In the months 
that 
followed, there was a flood of new issues of hybrids that pushed 
their yields up 
to and, in some cases, above the point where they were fully 
competitive with 
other sectors of the fixed income markets. We steadily built the 
Fund's position 
up to about 17% of the portfolio, trading actively along the way 
the hybrids 
that were held. That is where the Fund stands now, and it looks 
like another 
good decision so far. 
  
IS THE FUND LIKELY TO MOVE FURTHER INTO HYBRID PREFERREDS? 
  
    The Fund may very well buy more hybrids. It will depend on 
market 
conditions. Ideally, we would like to squeeze the last drop of 
overperformance 
out of the Fund's holdings of traditional preferreds. However, we 
will take 
advantage of better opportunities in hybrids, whenever they come 
along. In 
short, we will continue to be comparison shoppers. Some things 
never change! 
  
HOW DOES THE INCREASE IN THE FUND'S POSITION IN HYBRIDS AFFECT THE 
PORTION OF 
  THE FUND'S OWN DIVIDENDS THAT QUALIFIES FOR THE DIVIDENDS 
RECEIVED DEDUCTION? 
  
    It appears as though increasing the Fund's position in hybrids 
has not had 
significant tax consequences up to this point, although the exact 
numbers will 
not be known until the end of the fiscal year on November 30th. 
This favorable 
outcome stems from the intricacies of the tax laws that permit the 
Fund to 
deduct all its expenses against income that is not eligible for 
the DRD, such as 
income from hybrids. However, adding further to our holdings of 
hybrids probably 
would reduce the percentage of the Fund's dividends eligible for 
the DRD. 
  
                                       4 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                                           QUESTION & ANSWER 
SECTION (CONTINUED) 
                                                        MAY 31, 
1997 (UNAUDITED) 
                                 ---------------------------------
- -------------- 
  
    Although the Fund is no longer managed with a view to 
maximizing income 
eligible for the DRD, the DRD is still important. To the extent 
that our 
distributions do not fully qualify for the DRD, we must make extra 
"gross up" 
payments to holders of the Money Market Cumulative Preferred-TM- 
Stock that 
provides the Fund's leverage. In addition, the DRD increases the 
appeal of the 
Fund's shares to corporate investors and broadens the market for 
our stock, 
which helps all shareholders. 
  
    As a rule of thumb, if a traditional DRD eligible preferred is 
attractive to 
corporate investors generally, the Fund will probably be able to 
make money on 
it and get some advantage from the DRD also. If it is not 
attractive to 
corporate holders, who are typically the investors willing to pay 
the best 
price, the Fund probably should not own it either. 
  
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
FINANCIAL DATA 
PER SHARE OF COMMON STOCK (UNAUDITED) 
- --------------------------------------- 
  
<TABLE> 
<CAPTION> 
                                                                                                              
DIVIDEND 
                                                                    
DIVIDEND     NET ASSET       NYSE       REINVESTMENT 
                                                                      
PAID         VALUE     CLOSING PRICE    PRICE (1) 
                                                                   
- -----------  -----------  -------------  ------------- 
<S>                                                                
<C>          <C>          <C>            <C> 
December 31, 1996................................................   
$   0.280    $   12.56    $    11.625     $   11.65 
January 31, 1997.................................................       
0.073        12.47         11.625         11.69 
February 28, 1997................................................       
0.073        12.64         11.875         12.01 
March 31, 1997...................................................       
0.073        12.81         12.000         12.03 
April 30, 1997...................................................       
0.073        12.72         11.875         12.03 
May 31, 1997.....................................................       
0.073        12.84         12.375         12.44 
</TABLE> 
  
- ------------------------ 
  
(1) See ADDITIONAL INFORMATION; Dividend Reinvestment and Cash 
Purchase Plan on 
    pages 21 and 22 of this report. 
  
                                       5 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
PORTFOLIO OF INVESTMENTS 
MAY 31, 1997 (UNAUDITED) 
- -------------------------------------------------- 
<TABLE> 
<CAPTION> 
                                                VALUE 
 SHARES                                       (NOTE 1) 
- ---------                                    ----------- 
<C>        <S>                               <C> 
PREFERRED STOCKS AND SECURITIES -- 94.9% 
  ADJUSTABLE RATE PREFERRED STOCKS -- 30.7% 
      UTILITIES -- 10.8% 
   20,000  Alabama Power Company, 
             Series 1993, Adj. Rate Pfd....  $   471,250 
   22,470  Arizona Public Service Company, 
             Series Q, Adj. Rate Pfd.......    2,112,180 
    4,899  Entergy Gulf States Utilities 
             Inc., Series A, Adj. Rate 
             Pfd...........................      472,754 
           Georgia Power Company: 
    7,500    Series 1993 K, Adj. Rate 
             Pfd...........................      188,906 
   15,300    Series 1993-2 L, Adj. Rate 
             Pfd...........................      369,113 
    9,000  Gulf Power Company, 
             Adj. Rate Pfd.................      204,750 
   81,415  Illinois Power Company, 
             Series A, Adj. Rate Pfd.......    3,622,968 
  189,504  New York State Electric & Gas 
             Corporation, 
             Series B, Adj. Rate Pfd.......    4,477,032 
           Niagara Mohawk Power 
             Corporation: 
   95,275    Series A, Adj. Rate Pfd.......    1,929,319 
  195,918    Series B, Adj. Rate Pfd.......    4,726,522 
   25,000    Series C, Adj. Rate Pfd.......      578,125 
   12,300  Northern Indiana Public Service 
             Company, 
             Series A, Adj. Rate Pfd.......      564,263 
           Northern States Power Company: 
   11,520    Series A, Adj. Rate Pfd.......    1,091,520 
   13,935    Series B, Adj. Rate Pfd.......    1,320,341 
   42,900  Puget Sound Power & Light 
             Company, Series B, Adj. Rate 
             Pfd...........................    1,026,919 
                                             ----------- 
           TOTAL UTILITY ADJUSTABLE RATE 
            PREFERRED STOCKS...............   23,155,962 
                                             ----------- 
      BANKING -- 19.9% 
           BankAmerica Corporation: 
    9,050    Series A, Adj. Rate Pfd.......      447,409 
   69,200    Series B, Adj. Rate Pfd.......    6,561,025 
           BankBoston Corporation: 
    9,800    Series A, Adj. Rate Pfd.......      452,637 
   60,600    Series B, Adj. Rate Pfd.......    2,810,325 
   33,700    Series C, Adj. Rate Pfd.......    2,864,500 
  204,000  Bankers Trust New York 
             Corporation, Series Q, Adj. 
             Rate Pfd......................    4,857,750 
  
<CAPTION> 
                                                VALUE 
 SHARES                                       (NOTE 1) 
- ---------                                    ----------- 
<C>        <S>                               <C> 
PREFERRED STOCKS AND SECURITIES (CONTINUED) 
  ADJUSTABLE RATE PREFERRED STOCKS (CONTINUED) 
      BANKING (CONTINUED) 
           Chase Manhattan Corporation: 
   26,550    Series L, Adj. Rate Pfd.......  $ 2,628,450 
    7,600    Series N, Adj. Rate Pfd.......      190,950 
           Citicorp: 
   89,448    Second Series, Adj. Rate 
             Pfd...........................    8,486,379 
    1,500    Third Series, Adj. Rate 
             Pfd...........................      149,625 
   17,700    Series 18, Adj. Rate Pfd......      440,287 
    9,300    Series 19, Adj. Rate Pfd......      231,919 
           First Chicago NBD: 
   36,211    Series B, Adj. Rate Pfd.......    3,421,939 
   20,000    Series C, Adj. Rate Pfd.......    1,945,000 
   83,600  MBNA Corporation, 
             Series B, Adj. Rate Pfd.......    2,262,425 
   35,750  Morgan (J.P.) & Company Inc., 
             Series A, Adj. Rate Pfd.......    2,842,125 
   35,000  Republic New York Corporation, 
             Series D, Adj. Rate Pfd.......      866,250 
   20,000  Wells Fargo & Company, 
             Series B, Adj. Rate Pfd.......      917,500 
                                             ----------- 
           TOTAL BANKING ADJUSTABLE RATE 
            PREFERRED STOCKS...............   42,376,495 
                                             ----------- 
           TOTAL ADJUSTABLE RATE PREFERRED 
            STOCKS.........................   65,532,457 
                                             ----------- 
  
  FIXED RATE PREFERRED STOCKS AND SECURITIES -- 64.2% 
      UTILITIES -- 44.4% 
           Alabama Power Company: 
   55,000    7.375% TOPRS..................    1,343,375 
   46,700    7.60% TOPRS...................    1,149,988 
  159,700    Class A, 6.40% Pfd............    3,916,642 
   24,500    Series 1992-2, 7.60% Pfd......      612,806 
   61,800  Appalachian Power Company, 
             Series A, 8.25% TOPRS.........    1,560,450 
   22,646  Arizona Public Service Company, 
             Series W, 7.25% Pfd...........      576,058 
           Baltimore Gas & Electric 
             Company: 
   27,650    Series 1993, 6.70% Pfd........    2,875,600 
   48,800    Series 1995, 6.99% Pfd........    5,252,100 
</TABLE> 
  
                       See Notes to Financial Statements. 
  
                                       6 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                                            PORTFOLIO OF 
INVESTMENTS (CONTINUED) 
                                                        MAY 31, 
1997 (UNAUDITED) 
                              ------------------------------------
- -------------- 
<TABLE> 
<CAPTION> 
                                                VALUE 
 SHARES                                       (NOTE 1) 
- ---------                                    ----------- 
PREFERRED STOCKS AND SECURITIES (CONTINUED) 
<C>        <S>                               <C> 
  FIXED RATE PREFERRED STOCKS AND SECURITIES (CONTINUED) 
      UTILITIES (CONTINUED) 
    7,500  Boston Edison Company, 
             4.78% Pfd.....................  $   512,812 
      100  Central Hudson Gas & Electric 
             Corporation, 
             Series D, 4.35% Pfd...........        6,275 
   18,000  Columbus Southern Power Company, 
             Series B, 7.92% Pfd...........      445,050 
    7,500  Commonwealth Edison Company, 
             $8.40 Pfd.....................      768,750 
   10,000  Consolidated Edison Company 
             of New York, Series A, 7.75% 
             QUIPS.........................      248,750 
           Consumers Power Company: 
  111,833    Class A, 8.32% Pfd............    2,921,637 
    3,170    Series D, $7.45 Pfd...........      307,490 
    2,850    Series G, $7.76 Pfd...........      286,069 
   60,000  CPL Capital, 
             Series A, 8.00% QUIPS.........    1,522,500 
   54,400  Detroit Edison Company, 
             7.75% Pfd.....................    1,404,200 
           Duke Power Company: 
    8,900    Series 1993 A, 6.375% Pfd.....      221,387 
   24,700    Series C, 4.50% Pfd...........    1,750,612 
    4,000    Series E, 6.72% Pfd...........      403,000 
    6,000    Series R, 7.50% Pfd...........      629,250 
   26,700    Series S, 7.85% Pfd...........    2,910,300 
   13,200    Series W, 7.00% Pfd...........    1,409,100 
    2,755    Series Y, 7.04% Pfd...........      295,129 
   53,750  Duquesne Capital, 
             Series A, 8.375% MIPS.........    1,357,188 
   56,200  El Paso, Tennessee Pipeline 
             Company, Series A, 8.25% 
             Pfd...........................    3,076,950 
    6,000  Entergy Mississippi Inc., 
             8.36% Pfd.....................      613,500 
           Florida Power & Light Company: 
    4,000    4.50% Pfd.....................      280,000 
    4,105    Series E, 4.35% Pfd...........      274,009 
   32,850    Series S, 6.98% Pfd...........    3,490,312 
   18,100    Series T, 7.05% Pfd...........    1,938,963 
<CAPTION> 
                                                VALUE 
 SHARES                                       (NOTE 1) 
- ---------                                    ----------- 
<C>        <S>                               <C> 
PREFERRED STOCKS AND SECURITIES (CONTINUED) 
  FIXED RATE PREFERRED STOCKS AND SECURITIES (CONTINUED) 
      UTILITIES (CONTINUED) 
           Georgia Power Company: 
    1,246    $6.48 Pfd.....................  $   123,666 
    2,639    $6.60 Pfd.....................      266,539 
    8,400    7.60% TOPRS...................      207,690 
   21,000    Series Q, $1.9875 Pfd.........      534,187 
   12,500    Series S, $1.925 Pfd..........      319,531 
   10,000  Gulf Power Company, 
             Series A, 7.625% QUIPS........      247,750 
   12,500  Hawaiian Electric Industries, 
             8.36% TOPRS...................      315,625 
   10,000  Jersey Central Power & Light 
             Company, Series K, 7.52% 
             Sinking Fund Pfd..............    1,046,250 
    4,900  Massachusetts Electric Company, 
             6.84% Pfd.....................      125,562 
           Mississippi Power Company: 
   15,000    6.32% Pfd.....................      370,875 
   62,000    7.25% Pfd.....................    1,577,125 
   20,000  Monongahela Power Company, 
             Series L, $7.73 Pfd...........    2,170,000 
           Montana Power Capital: 
    3,900    $6.875 Pfd....................      408,037 
   30,000    Series A, 8.45% QUIPS.........      768,750 
           New York State Electric & Gas 
             Corporation: 
    5,000    6.30% Sinking Fund Pfd........      506,250 
    9,696    6.48% Pfd.....................      947,784 
           Niagara Mohawk Power 
             Corporation: 
    6,250    4.10% Pfd.....................      310,938 
   44,605    7.85% Sinking Fund Pfd........    1,120,701 
   62,000    9.50% Pfd.....................    1,619,750 
           Northern States Power Company: 
    2,380    $4.10 Pfd.....................      154,105 
    2,420    $4.16 Pfd.....................      158,813 
   47,500  Ohio Power Company, 
             Series B, 7.92% QUIDS.........    1,174,438 
    2,150  Pacific Enterprises, 
             $4.50 Pfd.....................      150,500 
</TABLE> 
  
                       See Notes to Financial Statements. 
  
                                       7 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
PORTFOLIO OF INVESTMENTS (CONTINUED) 
MAY 31, 1997 (UNAUDITED) 
- -------------------------------------------------- 
<TABLE> 
<CAPTION> 
                                                VALUE 
 SHARES                                       (NOTE 1) 
- ---------                                    ----------- 
PREFERRED STOCKS AND SECURITIES (CONTINUED) 
<C>        <S>                               <C> 
  FIXED RATE PREFERRED STOCKS AND SECURITIES (CONTINUED) 
      UTILITIES (CONTINUED) 
    9,000  Pacificorp, 
             7.48% Sinking Fund Pfd........  $   974,250 
   17,800  Pennsylvania Power Company, 
             7.75% Pfd.....................    1,679,875 
    1,413  Potomac Electric Power Company, 
             Series 1957, $2.44 Pfd........       54,047 
           PSI Energy, Inc.: 
    4,850    6.875% Pfd....................      507,431 
  167,582    7.44% Pfd.....................    4,283,815 
    5,776  Public Service Company of 
             Colorado, 4.64% Pfd...........      407,208 
           Puget Sound Power & Light 
             Company: 
   29,100    7.75% Sinking Fund Pfd........    3,070,050 
   47,135    7.875% Pfd....................    1,187,213 
  128,500    Series II, 7.45% Pfd..........    3,453,438 
    4,030  Rochester Gas & Electric 
             Corporation, Series I, 4.75% 
             Pfd...........................      271,018 
   78,800  San Diego Gas & Electric 
             Company, 6.80% Pfd............    2,063,575 
   26,000  Sierra Pacific Capital, 
             8.60% TOPRS...................      674,375 
   26,000  Southern California Gas Company, 
             7.75% Pfd.....................      669,500 
    5,000  South Carolina Electric & Gas, 
             6.52% Pfd.....................      522,500 
    4,000  Southern Indiana Gas & Electric, 
             4.75% Pfd.....................      282,500 
  160,000  Swepco Capital, 
             Series A, 7.875% Pfd..........    4,004,000 
           Transcanada Pipeline Ltd.: 
  123,693    8.50% COPRS...................    3,208,287 
  100,000    8.75% TOPRS...................    2,656,250 
           TU Capital: 
   60,220    Series M, 8.25% TOPRS.........    1,528,083 
    9,000    Series N, 9.00% TOPRS.........      234,000 
    3,000  Union Electric Company, 
             $7.64 Pfd.....................      325,875 
           Virginia Electric & Power 
             Company: 
    1,136    $4.04 Pfd.....................       71,568 
    1,420    $4.20 Pfd.....................       93,010 
   27,300    $6.98 Pfd.....................    2,897,213 
<CAPTION> 
                                                VALUE 
 SHARES                                       (NOTE 1) 
- ---------                                    ----------- 
<C>        <S>                               <C> 
PREFERRED STOCKS AND SECURITIES (CONTINUED) 
  FIXED RATE PREFERRED STOCKS AND SECURITIES (CONTINUED) 
      UTILITIES (CONTINUED) 
  
    5,500  Wisconsin Power & Light Company, 
             6.20% Pfd.....................  $   530,750 
                                             ----------- 
           TOTAL UTILITY FIXED RATE 
            PREFERRED STOCKS AND 
            SECURITIES.....................   94,634,949 
                                             ----------- 
      BANKING -- 4.9% 
           Bankers Trust New York 
             Corporation: 
1,000,000    Series B1, 7.90% Capital 
             Security, 144A**..............      980,000 
   21,000    Series O, 7.625% Pfd..........      539,437 
1,350,000  Bank of New York Inc., 
             7.78% Capital Security, 
             144A**........................    1,311,356 
           Chase Manhattan Corporation: 
  101,050    Series C, 10.84% Pfd..........    3,176,759 
   12,700    Series K, 7.50% Pfd...........      329,406 
2,500,000  First Union Institutional, 
             8.04% Capital Security, 
             144A**........................    2,520,000 
           Fleet Financial Group, Inc.: 
   12,300    Series VI, 6.75% Pfd..........      658,050 
   35,000    Series E, 9.35% Pfd...........      982,187 
                                             ----------- 
           TOTAL BANKING FIXED RATE 
            PREFERRED STOCKS...............   10,497,195 
                                             ----------- 
      FINANCIAL SERVICES -- 8.8% 
  174,950  Household International, Inc., 
             8.70% TOPRS...................    4,636,175 
  121,725  Lehman Brothers Holdings Inc., 
             5.00% Conv. Pfd...............    3,484,378 
           Merrill Lynch & Company, Inc.: 
   20,000    7.75% TOPRS...................      499,500 
   77,100    8.00% TOPRS...................    1,956,413 
  104,200    Series A, 9.00% Pfd...........    3,171,588 
   56,000  Morgan Stanley Group Inc., 
             7.75% Pfd.....................    3,024,000 
       21  Prudential Management, 
             6.30% PVT, Sinking Fund.......    1,869,000 
                                             ----------- 
           TOTAL FINANCIAL SERVICES FIXED 
            RATE PREFERRED STOCKS AND 
            SECURITIES.....................   18,641,054 
                                             ----------- 
</TABLE> 
  
                       See Notes to Financial Statements. 
  
                                       8 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                                            PORTFOLIO OF 
INVESTMENTS (CONTINUED) 
                                                        MAY 31, 
1997 (UNAUDITED) 
                              ------------------------------------
- -------------- 
<TABLE> 
<CAPTION> 
                                                VALUE 
 SHARES                                       (NOTE 1) 
- ---------                                    ----------- 
PREFERRED STOCKS AND SECURITIES (CONTINUED) 
<C>        <S>                               <C> 
  FIXED RATE PREFERRED STOCKS AND SECURITIES (CONTINUED) 
      INDUSTRIAL -- 3.7% 
   67,319  Coastal Corporation, 
             Series H, $2.125 Pfd..........  $ 1,720,842 
  103,570  Ford Motor Company, 
             Series B, 8.25% Pfd...........    2,880,541 
  110,800  James River Corporation, 
             Series O, 8.25% Pfd...........    2,818,475 
    9,520  Viad Corporation, 
             $4.75 Sinking Fund Pfd........      556,920 
                                             ----------- 
           TOTAL INDUSTRIAL FIXED RATE 
            PREFERRED STOCKS AND 
            SECURITIES.....................    7,976,778 
                                             ----------- 
      INSURANCE -- 2.4% 
  124,750  AON Corporation, 
             8.00% Pfd.....................    3,188,922 
   70,681  Hartford Capital, 
             Series B, 8.35% QUIPS.........    1,820,036 
                                             ----------- 
           TOTAL INSURANCE FIXED RATE 
            PREFERRED STOCKS AND 
            SECURITIES.....................    5,008,958 
                                             ----------- 
           TOTAL FIXED RATE PREFERRED 
            STOCKS AND SECURITIES..........  136,758,934 
                                             ----------- 
           TOTAL PREFERRED STOCKS AND 
            SECURITIES (Cost 
            $189,980,400)..................  202,291,391 
                                             ----------- 
  
COMMON STOCKS -- 3.1% 
      UTILITIES -- 3.1% 
   61,000  Consolidated Edison Company 
             of New York, Inc..............    1,765,187 
  220,800  Nevada Power Company............    4,512,600 
   17,500  Rochester Gas & Electric 
             Corporation...................      348,906 
                                             ----------- 
           TOTAL UTILITY COMMON STOCKS 
             (Cost $6,927,132).............    6,626,693 
                                             ----------- 
  
MISCELLANEOUS SECURITIES -- 0.4% (Cost $1,248,469) 
           Put Options on U.S. Treasury 
             Bond Futures..................      936,583 
                                             ----------- 
<CAPTION> 
  
PRINCIPAL                                       VALUE 
 AMOUNT                                       (NOTE 1) 
- ---------                                    ----------- 
<C>        <S>                               <C> 
REPURCHASE AGREEMENT -- 0.7% (Cost $1,583,000) 
$1,583,000 Agreement with UBS Securities 
             Inc., 5.50% dated 5/30/97, to 
             be repurchased at $1,583,726 
             on 6/2/97, collateralized by 
             $1,691,000 U.S. Treasury Note, 
             5.875% due 11/15/05 (value 
             $1,583,333)...................  $ 1,583,000 
                                             ----------- 
</TABLE> 
  
<TABLE> 
<S>                                    <C>        <C> 
TOTAL INVESTMENTS (Cost 
  $199,739,001*).....................       99.1% 211,437,667 
OTHER ASSETS AND LIABILITIES (NET)........        0.9      
1,853,222 
                                            ---------  -----------
- -- 
NET ASSETS................................      100.0% $ 
213,290,889 
                                            ---------  -----------
- -- 
                                            ---------  -----------
- -- 
</TABLE> 
  
- ---------------------------------- 
 * Aggregate cost for Federal tax purposes. 
** 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 buyers. 
  
ABBREVIATIONS: 
  
<TABLE> 
<S>        <C>        <C> 
COPRS         --      Canadian Originated Preferred Securities 
(Note 7) 
MIPS          --      Monthly Income Preferred Securities (Note 7) 
QUIDS         --      Quarterly Income Debt Securities (Note 7) 
QUIPS         --      Quarterly Income Preferred Securities (Note 
7) 
TOPRS         --      Trust Originated Preferred Securities (Note 
7) 
</TABLE> 
  
                       See Notes to Financial Statements. 
  
                                       9 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
STATEMENT OF ASSETS AND LIABILITIES 
MAY 31, 1997 (UNAUDITED) 
- -------------------------------------------- 
  
<TABLE> 
<S>                                                                
<C>          <C> 
ASSETS: 
    Investments, at value (Cost $199,739,001) (Note 1) 
      See accompanying schedule..................................               
$ 211,437,667 
    Cash.........................................................                          
70 
    Receivable for securities sold...............................                   
3,670,211 
    Dividends and interest receivable............................                   
1,289,418 
    Prepaid expenses.............................................                      
86,506 
                                                                                
- ------------- 
          Total Assets...........................................                 
216,483,872 
LIABILITIES: 
    Payable for securities purchased.............................  
$ 2,704,867 
    Dividends payable............................................      
248,874 
    Investment advisory fee payable (Note 2).....................      
100,968 
    Accrued expenses and other payables..........................      
138,274 
                                                                   
- ----------- 
          Total Liabilities......................................                   
3,192,983 
                                                                                
- ------------- 
NET ASSETS.......................................................               
$ 213,290,889 
                                                                                
- ------------- 
                                                                                
- ------------- 
NET ASSETS CONSIST OF: 
    Distributions in excess of net investment income (Note 1)....               
$     (73,844) 
    Accumulated net realized gain on investments sold (Note 1)...                   
2,731,564 
    Unrealized appreciation of investments (Note 3)..............                  
11,698,666 
    Par value of Common Stock....................................                     
111,513 
    Paid-in capital in excess of par value of Common Stock.......                 
128,822,990 
    Money Market Cumulative Preferred-TM- Stock (Note 5).........                  
70,000,000 
                                                                                
- ------------- 
          Total Net Assets.......................................               
$ 213,290,889 
                                                                                
- ------------- 
                                                                                
- ------------- 
                                                                    
PER SHARE 
                                                                   
- ----------- 
NET ASSETS AVAILABLE TO: 
    Money Market Cumulative Preferred-TM- Stock (700 shares 
      outstanding) redemption value..............................  
$100,000.00  $  70,000,000 
    Accumulated undeclared dividends on Money Market Cumulative 
      Preferred-TM- Stock........................................       
116.39         81,472 
                                                                   
- -----------  ------------- 
                                                                   
$100,116.39     70,081,472 
                                                                   
- ----------- 
                                                                   
- ----------- 
    Common Stock (11,151,287 shares outstanding).................       
$12.84    143,209,417 
                                                                        
- ------   ------------ 
                                                                        
- ------ 
TOTAL NET ASSETS.................................................               
$ 213,290,889 
                                                                                
- ------------- 
                                                                                
- ------------- 
</TABLE> 
  
                       See Notes to Financial Statements. 
  
                                       10 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                                                         STATEMENT 
OF OPERATIONS 
                               FOR THE SIX MONTHS ENDED MAY 31, 
1997 (UNAUDITED) 
                              ------------------------------------
- -------------- 
  
<TABLE> 
<S>                                                                     
<C>        <C> 
INVESTMENT INCOME: 
    
Dividends.........................................................             
$6,834,498 
    
Interest..........................................................                
208,210 
                                                                                   
- ---------- 
          Total Investment 
Income.....................................              7,042,708 
EXPENSES: 
    Investment advisory fee (Note 
2)..................................  $ 589,689 
    Administration fee (Note 
2).......................................    126,573 
    Money Market Cumulative Preferred-TM- broker commissions 
      and Auction Agent 
fees..........................................     88,478 
    Legal and audit 
fees..............................................     44,804 
    Insurance 
expense.................................................     
43,647 
    Shareholder servicing agent fees (Note 
2).........................     36,483 
    Directors' fees and expenses (Note 
2).............................     26,444 
    Economic consulting fee (Note 
2)..................................     22,667 
    Custodian fees (Note 
2)...........................................     18,006 
    Amortization of deferred organization costs (Note 
6)..............      3,333 
    
Other.............................................................     
34,348 
                                                                        
- --------- 
          Total 
Expenses..............................................              
1,034,472 
                                                                                   
- ---------- 
NET INVESTMENT 
INCOME.................................................              
6,008,236 
                                                                                   
- ---------- 
REALIZED AND UNREALIZED GAIN/(LOSS) ON INVESTMENTS 
  (Notes 1 and 3): 
    Net realized gain on investments sold during the 
period...........              2,184,471 
    Change in net unrealized appreciation/(depreciation) of 
      investments during the 
period...................................               (266,515) 
                                                                                   
- ---------- 
NET REALIZED AND UNREALIZED GAIN ON 
INVESTMENTS.......................              1,917,956 
                                                                                   
- ---------- 
NET INCREASE IN NET ASSETS RESULTING FROM 
OPERATIONS..................             $7,926,192 
                                                                                   
- ---------- 
                                                                                   
- ---------- 
</TABLE> 
  
                       See Notes to Financial Statements. 
  
                                       11 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
STATEMENT OF CHANGES IN NET ASSETS 
- ---------------------------------------------- 
  
<TABLE> 
<CAPTION> 
                                                                             
SIX MONTHS ENDED 
                                                                               
MAY 31, 1997         YEAR ENDED 
                                                                               
(UNAUDITED)       NOVEMBER 30, 1996 
                                                                            
- ------------------  ------------------- 
<S>                                                                         
<C>                 <C> 
OPERATIONS: 
  Net investment 
income...................................................   $      
6,008,236    $      12,914,657 
  Net realized gain on investments sold during the 
period.................          2,184,471            6,552,224 
  Change in net unrealized appreciation/(depreciation) of 
investments 
    during the 
period.....................................................           
(266,515)            (630,710) 
                                                                            
- ------------------  ------------------- 
  Net increase in net assets resulting from 
operations....................          7,926,192           
18,836,171 
  
DISTRIBUTIONS: 
  Dividends paid from net investment income to Money Market 
Cumulative 
    Preferred-TM- Stock Shareholders (Note 
5).............................         (1,621,959)          
(2,326,879) 
  Distributions paid from net realized capital gains to Money 
Market 
    Cumulative Preferred-TM- Stock Shareholders (Note 
5)..................            (15,432)            (383,206) 
  Dividends paid from net investment income to Common Stock 
    
Shareholders......................................................
 ....         (5,461,360)          (9,651,475) 
  Distributions paid from net realized capital gains to Common 
Stock 
    
Shareholders......................................................
 ....         (1,731,258)          -- 
NET INCREASE/(DECREASE) IN NET ASSETS FOR THE 
PERIOD......................           (903,817)           
6,474,611 
                                                                            
- ------------------  ------------------- 
NET ASSETS: 
  Beginning of 
period.....................................................        
214,194,706          207,720,095 
                                                                            
- ------------------  ------------------- 
  End of period (including (distributions in excess of net 
investment 
    income)/undistributed net investment income of $(73,844) and 
    $1,001,239, 
respectively).............................................   $    
213,290,889    $     214,194,706 
                                                                            
- ------------------  ------------------- 
                                                                            
- ------------------  ------------------- 
</TABLE> 
  
                       See Notes to Financial Statements. 
  
                                       12 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                                                            
FINANCIAL HIGHLIGHTS 
                          FOR A COMMON SHARE OUTSTANDING 
THROUGHOUT EACH PERIOD. 
                        ------------------------------------------
- -------------- 
  
    Contained below is per share operating performance data, total 
investment 
returns, ratios to average net assets and other supplemental 
data.This 
information has been derived from information provided in the 
financial 
statements and market price data for the Fund's shares. 
<TABLE> 
<CAPTION> 
                                                               SIX 
MONTHS ENDED       YEAR ENDED        YEAR ENDED 
                                                                 
MAY 31, 1997        NOVEMBER 30,      NOVEMBER 30, 
                                                                 
(UNAUDITED)             1996              1995 
                                                             -----
- ---------------  ----------------  ---------------- 
<S>                                                          <C>                   
<C>               <C> 
OPERATING PERFORMANCE: 
Net asset value, beginning of period.......................       
$    12.91         $      12.35      $      10.92 
                                                                 -
- ----------       ----------------  ---------------- 
Net investment income......................................             
0.54                 1.16              1.27 
Net realized and unrealized gain/(loss) on investments.....             
0.17                 0.53              1.73 
                                                                 -
- ----------       ----------------  ---------------- 
Net increase/(decrease) in net asset value resulting from 
 investment operations.....................................             
0.71                 1.69              3.00 
Offering costs and MMP**** 
 underwriting commissions charged to paid-in capital.......               
- --                   --                -- 
DISTRIBUTIONS: 
Dividends paid from net investment income to MMP**** 
 Shareholders..............................................            
(0.14)               (0.21)            (0.31) 
Distributions paid from net realized capital gains to 
 MMP**** Shareholders......................................            
(0.00)#              (0.03)            (0.00) 
Dividends paid from net investment income to Common Stock 
 Shareholders..............................................            
(0.49)               (0.87)            (1.11) 
Distributions paid from net realized capital gains to 
 Common Stock Shareholders.................................            
(0.16)                  --             (0.17) 
Change in accumulated undeclared dividends on MMP****......             
0.01                (0.02)             0.02 
                                                                 -
- ----------       ----------------  ---------------- 
Total distributions........................................            
(0.78)               (1.13)            (1.57) 
                                                                 -
- ----------       ----------------  ---------------- 
Net asset value, end of period.............................       
$    12.84         $      12.91      $      12.35 
                                                                 -
- ----------       ----------------  ---------------- 
                                                                 -
- ----------       ----------------  ---------------- 
Market value, end of period................................       
$   12.375         $     12.000      $     11.250 
                                                                 -
- ----------       ----------------  ---------------- 
                                                                 -
- ----------       ----------------  ---------------- 
Total investment return based on net asset value***........            
4.97%               13.11%            27.25% 
                                                                 -
- ----------       ----------------  ---------------- 
                                                                 -
- ----------       ----------------  ---------------- 
Total investment return based on market value***...........            
8.85%               15.42%            25.02% 
                                                                 -
- ----------       ----------------  ---------------- 
                                                                 -
- ----------       ----------------  ---------------- 
Net assets, end of period (in 000's).......................       
$  213,291         $    214,195      $    207,720 
                                                                 -
- ----------       ----------------  ---------------- 
                                                                 -
- ----------       ----------------  ---------------- 
RATIOS TO AVERAGE NET ASSETS AVAILABLE TO COMMON STOCK 
 SHAREHOLDERS/ SUPPLEMENTAL DATA: 
  Net investment income....................................            
6.33%**              7.36%             8.47% 
  Operating expenses.......................................            
1.46%**              1.71%             1.78% 
  Portfolio turnover rate..................................              
31%                  87%               94% 
EXPENSE RATIO TO TOTAL AVERAGE NET ASSETS 
 (WHICH INCLUDES MMP****): 
  Operating expenses.......................................            
0.98%**              1.13%             1.13% 
  
<CAPTION> 
                                                                
YEAR ENDED        YEAR ENDED        YEAR ENDED 
                                                               
NOVEMBER 30,      NOVEMBER 30,      NOVEMBER 30, 
                                                                   
1994              1993             1992* 
                                                             -----
- -----------  ----------------  ---------------- 
<S>                                                          <C>               
<C>               <C> 
OPERATING PERFORMANCE: 
Net asset value, beginning of period.......................    $      
13.17      $      12.69      $      11.63 
                                                             -----
- -----------  ----------------  ---------------- 
Net investment income......................................            
1.19              1.19              0.88 
Net realized and unrealized gain/(loss) on investments.....           
(1.64)             0.92              1.09 
                                                             -----
- -----------  ----------------  ---------------- 
Net increase/(decrease) in net asset value resulting from 
 investment operations.....................................           
(0.45)             2.11              1.97 
Offering costs and MMP**** 
 underwriting commissions charged to paid-in capital.......              
- --                --             (0.19) 
DISTRIBUTIONS: 
Dividends paid from net investment income to MMP**** 
 Shareholders..............................................           
(0.18)            (0.15)            (0.10) 
Distributions paid from net realized capital gains to 
 MMP**** Shareholders......................................           
(0.03)            (0.05)            (0.02) 
Dividends paid from net investment income to Common Stock 
 Shareholders..............................................           
(0.86)            (1.18)            (0.58) 
Distributions paid from net realized capital gains to 
 Common Stock Shareholders.................................           
(0.72)            (0.26)               -- 
Change in accumulated undeclared dividends on MMP****......           
(0.01)             0.01             (0.02) 
                                                             -----
- -----------  ----------------  ---------------- 
Total distributions........................................           
(1.80)            (1.63)            (0.72) 
                                                             -----
- -----------  ----------------  ---------------- 
Net asset value, end of period.............................    $      
10.92      $      13.17      $      12.69 
                                                             -----
- -----------  ----------------  ---------------- 
                                                             -----
- -----------  ----------------  ---------------- 
Market value, end of period................................    $     
10.125      $     13.250      $     13.625 
                                                             -----
- -----------  ----------------  ---------------- 
                                                             -----
- -----------  ----------------  ---------------- 
Total investment return based on net asset value***........           
(5.44)%          16.04%            14.18% 
                                                             -----
- -----------  ----------------  ---------------- 
                                                             -----
- -----------  ----------------  ---------------- 
Total investment return based on market value***...........          
(12.83)%           8.70%            14.10% 
                                                             -----
- -----------  ----------------  ---------------- 
                                                             -----
- -----------  ----------------  ---------------- 
Net assets, end of period (in 000's).......................    $    
191,797      $    213,569      $    200,469 
                                                             -----
- -----------  ----------------  ---------------- 
                                                             -----
- -----------  ----------------  ---------------- 
RATIOS TO AVERAGE NET ASSETS AVAILABLE TO COMMON STOCK 
 SHAREHOLDERS/ SUPPLEMENTAL DATA: 
  Net investment income....................................           
8.31%             7.65%             7.46%** 
  Operating expenses.......................................           
1.69%             1.72%             1.73%** 
  Portfolio turnover rate..................................            
116%              129%               77% 
EXPENSE RATIO TO TOTAL AVERAGE NET ASSETS 
 (WHICH INCLUDES MMP****): 
  Operating expenses.......................................           
1.11%             1.14%             1.19%** 
</TABLE> 
  
- ---------------------------------------- 
   * The Fund commenced operations on February 13, 1992. 
  ** Annualized. 
 *** Assumes reinvestment of distributions. 
**** Money Market Cumulative Preferred-TM- Stock 
  # Amount represents less than $0.01 per share. 
  
                       See Notes to Financial Statements. 
  
                                       13 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
FINANCIAL HIGHLIGHTS (CONTINUED) 
- --------------------------------------- 
  
    The table below sets out information with respect to Money 
Market Cumulative 
Preferred-TM- Stock currently outstanding. 
  
<TABLE> 
<CAPTION> 
                                                                                         
INVOLUNTARY         AVERAGE 
                                                                              
ASSET      LIQUIDATING         MARKET 
                                                           TOTAL 
SHARES     COVERAGE     PREFERENCE           VALUE 
                                                            
OUTSTANDING     PER SHARE   PER SHARE (1)  PER SHARE (1) & (2) 
                                                          --------
- -------  -----------  -------------  ------------------- 
<S>                                                       <C>              
<C>          <C>            <C> 
05/31/97                                                           
700     $   304,701   $   100,000      $     100,000 
11/30/96                                                           
700         305,992       100,000            100,000 
11/30/95                                                           
700         296,743       100,000            100,000 
11/30/94                                                           
700         273,996       100,000            100,000 
11/30/93                                                           
700         305,099       100,000            100,000 
11/30/92                                                           
700         286,384       100,000            100,000 
</TABLE> 
  
- ---------------------------------------- 
(1) Excludes accumulated undeclared dividends. 
(2) See Note 5. 
  
                       See Notes to Financial Statements. 
  
                                       14 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                                       NOTES TO FINANCIAL 
STATEMENTS (UNAUDITED) 
                            --------------------------------------
- -------------- 
  
1.  SIGNIFICANT ACCOUNTING POLICIES 
  
    Preferred Income Opportunity Fund Incorporated (the "Fund") is 
a 
diversified, closed-end management investment company organized as 
a Maryland 
corporation on December 10, 1991 and is registered with the 
Securities and 
Exchange Commission ("SEC") under the Investment Company Act of 
1940, as 
amended. The Fund commenced operations on February 13, 1992. The 
policies 
described below are followed consistently by the Fund in the 
preparation of its 
financial statements in conformity with generally accepted 
accounting 
principles. 
  
    PORTFOLIO VALUATION:  The net asset value of the Fund's Common 
Stock is 
determined by the Fund's administrator no less frequently than on 
the last 
business day of each week and month. It is determined by dividing 
the value of 
the Fund's net assets attributable to common shares by the number 
of shares of 
Common Stock outstanding. The value of the Fund's net assets 
attributable to 
common shares is deemed to equal the value of the Fund's total 
assets less (i) 
the Fund's liabilities, (ii) the aggregate liquidation value of 
the outstanding 
Money Market Cumulative Preferred-TM- Stock and (iii) accumulated 
and unpaid 
dividends on the outstanding Money Market Cumulative Preferred-TM- 
Stock. 
Securities listed on a national securities exchange are valued on 
the basis of 
the last sale on such exchange on the day of valuation. In the 
absence of sales 
of listed securities and with respect to securities for which the 
most recent 
sale prices are not deemed to represent fair market value and 
unlisted 
securities (other than money market instruments), securities are 
valued at the 
mean between the closing bid and asked prices when quoted prices 
for investments 
are readily available. Investments for which market quotations are 
not readily 
available are valued at fair value as determined in good faith by 
or under the 
direction of the Board of Directors of the Fund, including 
reference to 
valuations of other securities which are considered comparable in 
quality, 
maturity and type. Investments in money market instruments, which 
mature in 60 
days or less, are valued at amortized cost. 
  
    SECURITIES TRANSACTIONS AND INVESTMENT INCOME:  Securities 
transactions are 
recorded as of the trade date. Realized gains and losses from 
securities sold 
are recorded on the identified cost basis. Dividend income is 
recorded on 
ex-dividend dates. Interest income is recorded on the accrual 
basis. 
  
    OPTION ACCOUNTING PRINCIPLES:  Upon the purchase of a put 
option by the 
Fund, the total purchase price paid is recorded as an investment. 
The market 
valuation is determined as set forth in the second preceding 
paragraph. When the 
Fund enters into a closing sale transaction, the Fund will record 
a gain or loss 
depending on the difference between the purchase and sale price. 
The risks 
associated with purchasing options and the maximum loss the Fund 
would incur are 
limited to the purchase price originally paid. 
  
    REPURCHASE AGREEMENTS:  The Fund may engage in repurchase 
agreement 
transactions. The Fund's Board of Directors reviews and approves 
periodically 
the eligibility of the banks and dealers with which the Fund 
enters into 
repurchase agreement transactions. The value of the collateral 
underlying such 
transactions is at least equal at all times to the total amount of 
the 
repurchase obligations, including interest. The Fund maintains 
possession of the 
collateral and, in the event of counterparty default, the Fund has 
the right to 
use 
  
                                       15 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED) 
- ----------------------------------------------------------------- 
the collateral to offset losses incurred. There is the possibility 
of loss to 
the Fund in the event the Fund is delayed or prevented from 
exercising its 
rights to dispose of the collateral securities. 
  
    DIVIDENDS AND DISTRIBUTIONS TO SHAREHOLDERS:  The Fund expects 
to declare 
dividends on a monthly basis to shareholders of Common Stock. The 
shareholders 
of Money Market Cumulative Preferred-TM- Stock are entitled to 
receive 
cumulative cash dividends as declared by the Fund's Board of 
Directors. 
Distributions to shareholders are recorded on the ex-dividend 
date. Any net 
realized short-term capital gains will be distributed to 
shareholders at least 
annually. Any net realized long-term capital gains may be 
distributed to 
shareholders at least annually or may be retained by the Fund as 
determined by 
the Fund's Board of Directors. Capital gains retained by the Fund 
are subject to 
tax at the corporate tax rate. Any taxes paid by the Fund on such 
net realized 
long-term gains may be used by the Fund's Common Stock 
Shareholders as a credit 
against their own tax liabilities subject to the Fund qualifying 
as a regulated 
investment company as described in the following paragraph. 
  
    FEDERAL INCOME TAXES:  The Fund intends to qualify as a 
regulated investment 
company by complying with the requirements under Subchapter M of 
the Internal 
Revenue Code of 1986, as amended, applicable to regulated 
investment companies 
and intends to distribute substantially all of its taxable net 
investment income 
to its shareholders. Therefore, no Federal income tax provision is 
required. 
  
    Income distributions and capital gain distributions are 
determined in 
accordance with income tax regulations which may differ from 
generally accepted 
accounting principles. These differences are primarily due to 
differing 
treatments of income and gains on various investment securities 
held by the 
Fund, timing differences and the differing characterization of 
distributions 
made by the Fund. 
  
    The preparation of financial statements in accordance with 
generally 
accepted accounting principles requires management to make 
estimates and 
assumptions that affect the reported amounts and disclosures in 
the financial 
statements. Actual results could differ from those estimates. 
  
2.  INVESTMENT ADVISORY FEE, DIRECTORS' FEES, ECONOMIC CONSULTING 
FEE, 
   ADMINISTRATION FEE AND TRANSFER AGENT FEE 
  
    Flaherty & Crumrine Incorporated (the "Adviser") serves as the 
Fund's 
Investment Adviser. The Fund pays the Adviser a monthly fee at an 
annual rate of 
0.625% of the value of the Fund's average monthly net assets up to 
$100 million 
and 0.50% of the value of the Fund's average monthly net assets in 
excess of 
$100 million. 
  
    The Fund currently pays each Director who is not a director, 
officer or 
employee of the Adviser a fee of $9,000 per annum, plus $500 for 
each in-person 
meeting of the Board of Directors or any committee and $100 for 
each telephone 
meeting. In addition, the Fund will reimburse all Directors for 
travel and 
out-of-pocket expenses incurred in connection with such meetings. 
  
                                       16 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                           NOTES TO FINANCIAL STATEMENTS 
(UNAUDITED) (CONTINUED) 
               ---------------------------------------------------
- -------------- 
  
    Primark Decision Economics Inc. ("Primark") serves as the 
Fund's Economic 
Consultant. The Fund pays Primark an annual fee equal to $45,333 
for services 
provided 
  
    First Data Investor Services Group, Inc. ("Investor Services 
Group"), a 
wholly owned subsidiary of First Data Corporation, serves as the 
Fund's 
Administrator and Transfer Agent. As Administrator, Investor 
Services Group 
calculates the net asset value of the Fund's shares and generally 
assists in all 
aspects of the Fund's administration and operation. As 
compensation for Investor 
Services Group's services as Administrator, the Fund pays Investor 
Services 
Group a monthly fee at an annual rate of 0.12% of the Fund's 
average monthly net 
assets. Boston Safe Deposit and Trust Company ("Boston Safe"), a 
wholly owned 
subsidiary of Mellon Bank Corporation, serves as the Fund's 
Custodian. As 
compensation for Boston Safe's services as Custodian, the Fund 
pays Boston Safe 
a monthly fee at an annual rate of 0.01% of the Fund's average 
monthly net 
assets. Investor Services Group also serves as the Fund's Common 
Stock servicing 
agent (transfer agent), dividend-paying agent and registrar, and 
as compensation 
for Investor Services Group's services as transfer agent, the Fund 
pays Investor 
Services Group a fee at an annual rate of 0.02% of the Fund's 
average monthly 
net assets plus certain out-of-pocket expenses. 
  
    Chase Manhattan Bank ("Auction Agent") serves as the Fund's 
Money Market 
Cumulative Preferred-TM- Stock transfer agent, registrar, dividend 
disbursing 
agent and redemption agent. 
  
3.  PURCHASES AND SALES OF SECURITIES 
  
    Cost of purchases and proceeds from sales of securities for 
the six months 
ended May 31, 1997, excluding short-term investments, aggregated 
$64,273,725 and 
$68,554,154, respectively. 
  
    At May 31, 1997, aggregate gross unrealized appreciation for 
all securities 
in which there is an excess of value over tax cost was $12,591,377 
and aggregate 
gross unrealized depreciation for all securities in which there is 
an excess of 
tax cost over value was $892,711. 
  
4.  COMMON STOCK 
  
    At May 31, 1997, 240,000,000 shares of $0.01 par value Common 
Stock were 
authorized. There were no Common Stock transactions for the six 
months ended May 
31, 1997 and the year ended November 30, 1996. 
  
5.  MONEY MARKET CUMULATIVE PREFERRED-TM- STOCK 
  
    The Fund's Articles of Incorporation authorize the issuance of 
up to 
10,000,000 shares of $0.01 par value preferred stock. On April 9, 
1992, the Fund 
received proceeds from the public offering of 700 shares of Money 
Market 
Cumulative Preferred-TM- Stock of $70,000,000 before offering 
costs of $144,375 
and underwriting discounts and commissions paid directly to Lehman 
Brothers Inc. 
of $1,225,000. The Money Market Cumulative Preferred-TM- Stock is 
senior to the 
Common Stock and results in the financial leveraging of the Common 
Stock. Such 
leveraging tends to magnify both the risks and opportunities to 
Common Stock 
Shareholders. Dividends on shares of Money Market Cumulative 
Preferred-TM- Stock 
are cumulative. 
  
                                       17 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
NOTES TO FINANCIAL STATEMENTS (UNAUDITED) (CONTINUED) 
- ----------------------------------------------------------------- 
  
    The Fund is required to meet certain asset coverage tests with 
respect to 
the Money Market Cumulative Preferred-TM- Stock. If the Fund fails 
to meet these 
requirements and does not correct such failure, the Fund may be 
required to 
redeem, in part or in full, Money Market Cumulative Preferred-TM- 
Stock at a 
redemption price of $100,000 per share plus an amount equal to the 
accumulated 
and unpaid dividends on such shares in order to meet these 
requirements. 
Additionally, failure to meet the foregoing asset requirements 
could restrict 
the Fund's ability to pay dividends to Common Stock Shareholders 
and could lead 
to sales of portfolio securities at inopportune times. 
  
    If the Fund allocates any net gains or income ineligible for 
the Dividends 
Received Deduction to shares of the Money Market Cumulative 
Preferred-TM- Stock, 
the Fund may be required to make additional distributions to Money 
Market 
Cumulative Preferred-TM- Stock Shareholders or to pay a higher 
dividend rate in 
amounts needed to provide a return, net of tax, equal to the 
return had such 
originally paid distributions been eligible for the Dividends 
Received 
Deduction. 
  
    An auction of the Money Market Cumulative Preferred-TM- Stock 
is generally 
held every 49 days. Existing shareholders may submit an order to 
hold, bid or 
sell such shares at par value on each auction date. Money Market 
Cumulative 
Preferred-TM- Stock Shareholders may also trade shares in the 
secondary market 
between auction dates. 
  
    At May 31, 1997, 700 shares of Money Market Cumulative 
Preferred-TM- Stock 
were outstanding at the annual rate of 4.19%. The dividend rate, 
as set by the 
auction process, is generally expected to vary with short-term 
interest rates. 
These rates may vary in a manner unrelated to the income received 
on the Fund's 
assets, which could have either a beneficial or detrimental impact 
on net 
investment income and gains available to Common Stock 
Shareholders. While the 
Fund expects to structure the portfolio holdings and hedging 
transactions to 
lessen such risks to Common Stock Shareholders, there can be no 
assurance that 
such results will be attained. 
  
6.  ORGANIZATION COSTS 
  
    Costs incurred by the Fund in connection with its organization 
and initial 
public offering of Common Stock and Money Market Cumulative 
Preferred-TM- Stock 
were $40,000 and $30,000, respectively, and were amortized on a 
straight-line 
basis over a five year period beginning February 13, 1992 (the 
date of the 
Fund's commencement of investment operations) and April 9, 1992 
(the date of the 
issuance of the Fund's Money Market Cumulative Preferred-TM- 
Stock), 
respectively. As of May 31, 1997, all such costs have been fully 
amortized. 
  
7.  PORTFOLIO INVESTMENTS, CONCENTRATION AND INVESTMENT QUALITY 
  
    The Fund invests primarily in adjustable and fixed rate 
preferred securities 
and related hybrid securities. Under normal market conditions, the 
Fund invests 
at least 25% of its assets in securities issued by utilities and 
may invest a 
significant portion of its assets, but less than 25% of its 
assets, in companies 
in the banking industry. The Fund's portfolio may therefore be 
subject to 
greater risk and market fluctuation than a portfolio of securities 
representing 
a broader range of investment alternatives. Because of the Fund's 
concentration 
of 
  
                                       18 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                           NOTES TO FINANCIAL STATEMENTS 
(UNAUDITED) (CONTINUED) 
               ---------------------------------------------------
- -------------- 
investments in the utility industry and significant holdings in 
the banking 
industry, the ability of the Fund to maintain its dividend and the 
value of the 
Fund's investments could be adversely affected by the possible 
inability of 
companies in these industries to pay dividends and interest on 
their securities 
and the ability of holders of securities of such companies to 
realize any value 
from the assets of the issuer upon liquidation or bankruptcy. The 
Fund may 
invest up to 15% of its assets at the time of purchase in 
securities rated below 
investment grade, provided that no such investment may be rated 
below both "Ba" 
by Moody's Investors Service, Inc. and "BB" by Standard & Poor's 
Rating Group or 
judged to be comparable in quality at the time of purchase; 
however, any such 
securities must be issued by an issuer having an outstanding class 
of senior 
debt rated investment grade. The Fund may also invest up to 15% of 
its assets in 
common stock. The Fund's investment policy regarding debt 
securities was amended 
on July 21, 1995. The amended policy allows the Fund to invest up 
to 35% of its 
assets collectively in the following: Trust Originated Preferred 
Securities 
("TOPRS"), Monthly Income Preferred Shares ("MIPS"), Quarterly 
Income Debt 
Securities ("QUIDS"), Quarterly Income Preferred Shares ("QUIPS"), 
Canadian 
Originated Preferred Securities ("COPRS"), and similarly-
structured instruments 
commonly referred to as hybrid or taxable preferreds, subject to 
the quality 
standards set forth above. 
  
8.  SPECIAL INVESTMENT TECHNIQUES 
  
    The Fund may employ certain investment techniques in 
accordance with its 
fundamental investment policies. These may include the use of 
when-issued and 
delayed delivery transactions. Securities purchased or sold on a 
when-issued or 
delayed delivery basis may be settled within 45 days after the 
date of the 
transaction. Such transactions may expose the Fund to credit and 
market 
valuation risk greater than that associated with regular trade 
settlement 
procedures. The Fund may also enter into transactions, in 
accordance with its 
fundamental investment policies, involving any or all of the 
following: lending 
of portfolio securities, short sales of securities, futures 
contracts, options 
on futures contracts, and options on securities. With the 
exception of 
purchasing securities on a when-issued or delayed delivery basis 
or lending 
portfolio securities, these transactions are used for hedging or 
other 
appropriate risk-management purposes or, under certain other 
circumstances, to 
increase income. As of May 31, 1997, the Fund owned put options on 
U.S. Treasury 
bond futures contracts. No assurance can be given that such 
transactions will 
achieve their desired purposes or will result in an overall 
reduction of risk to 
the Fund. 
  
                                       19 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
QUARTERLY RESULTS OF INVESTMENT OPERATION (UNAUDITED) 
- ------------------------------------------------------------------
- ---- 
  
<TABLE> 
<CAPTION> 
                                                             
AVAILABLE TO COMMON STOCK SHAREHOLDERS 
                                        --------------------------
- ------------------------------------------------------ 
                                                                        
NET REALIZED AND        NET INCREASE/(DECREASE) 
                    INVESTMENT                NET INVESTMENT         
UNREALIZED GAIN/(LOSS)       IN NET ASSETS FROM 
                      INCOME                      INCOME                 
ON INVESTMENTS               OPERATIONS 
            --------------------------  --------------------------  
- -------------------------  ------------------------- 
 QUARTER                       PER                         PER                         
PER                        PER 
  ENDED         TOTAL        SHARE*         TOTAL        SHARE*         
TOTAL        SHARE*        TOTAL        SHARE* 
- ----------  -------------  -----------  -------------  -----------  
- --------------  ---------  --------------  --------- 
<S>         <C>            <C>          <C>            <C>          
<C>             <C>        <C>             <C> 
  02/28/95  $   3,861,014   $    0.35   $   2,420,831   $    0.22   
$    4,639,812  $    0.41  $    7,060,643  $    0.63 
  05/31/95      4,149,620        0.37       2,769,492        0.25        
9,552,841       0.86      12,322,333       1.11 
  08/31/95      4,225,009        0.38       2,843,183        0.25          
518,935       0.05       3,362,118       0.30 
  11/30/95      4,181,057        0.37       2,849,065        0.26        
4,620,773       0.41       7,469,838       0.67 
  02/29/96      3,672,584        0.33       2,333,543        0.21       
(4,454,117)     (0.40)     (2,120,574)     (0.19) 
  05/31/96      3,868,154        0.35       2,573,570        0.23        
2,444,402       0.22       5,017,972       0.45 
  08/31/96      3,961,160        0.35       2,661,602        0.24         
(716,135)     (0.06)      1,945,467       0.18 
  11/30/96      3,744,137        0.34       2,845,619        0.25        
8,647,364       0.77      11,492,983       1.02 
  02/28/97      3,328,538        0.30       2,789,856        0.25         
(233,256)     (0.02)      2,556,600       0.23 
  05/31/97      3,714,170        0.33       3,218,380        0.29        
2,151,212       0.19       5,369,592       0.48 
</TABLE> 
  
- ------------------------ 
  
* Per share of common stock. 
  
                                       20 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
                                  Preferred Income Opportunity 
Fund Incorporated 
                                              ADDITIONAL 
INFORMATION (UNAUDITED) 
                                      ----------------------------
- -------------- 
  
DIVIDEND REINVESTMENT AND CASH PURCHASE PLAN 
  
    Under the Fund's Dividend Reinvestment and Cash Purchase Plan 
(the "Plan"), 
a shareholder whose Common Stock is registered in his own name 
will have all 
distributions reinvested automatically by Investor Services Group 
as agent under 
the Plan, unless the shareholder elects to receive cash. 
Distributions with 
respect to shares registered in the name of a broker-dealer or 
other nominee 
(that is, in "street name") may be reinvested by the broker or 
nominee in 
additional shares under the Plan, but only if the service is 
provided by the 
broker or nominee, unless the shareholder elects to receive 
distributions in 
cash. A shareholder who holds Common Stock registered in the name 
of a broker or 
other nominee may not be able to transfer the Common Stock to 
another broker or 
nominee and continue to participate in the Plan. Investors who own 
Common Stock 
registered in street name should consult their broker or nominee 
for details 
regarding reinvestment. 
  
    The number of shares of Common Stock distributed to 
participants in the Plan 
in lieu of a cash dividend is determined in the following manner. 
Whenever the 
market price per share of the Fund's Common Stock is equal to or 
exceeds the net 
asset value per share on the valuation date, participants in the 
Plan will be 
issued new shares valued at the higher of net asset value or 95% 
of the then 
current market value. Otherwise, Investor Services Group will buy 
shares of the 
Fund's Common Stock in the open market, on the New York Stock 
Exchange or 
elsewhere, on or shortly after the payment date of the dividend or 
distribution 
and continuing until the ex-dividend date of the Fund's next 
distribution to 
holders of the Common Stock or until it has expended for such 
purchases all of 
the cash that would otherwise be payable to the participants. The 
number of 
purchased shares that will then be credited to the participants' 
accounts will 
be based on the average per share purchase price of the shares so 
purchased, 
including brokerage commissions. If Investor Services Group 
commences purchases 
in the open market and the then current market price of the shares 
(plus any 
estimated brokerage commissions) subsequently exceeds their net 
asset value most 
recently determined before the completion of the purchases, 
Investor Services 
Group will attempt to terminate purchases in the open market and 
cause the Fund 
to issue the remaining dividend or distribution in shares. In this 
case, the 
number of shares received by the participant will be based on the 
weighted 
average of prices paid for shares purchased in the open market and 
the price at 
which the Fund issues the remaining shares. These remaining shares 
will be 
issued by the Fund at the higher of net asset value or 95% of the 
then current 
market value. 
  
    Plan participants are not subject to any charge for 
reinvesting dividends or 
capital gains distributions. Each Plan participant will, however, 
bear a 
proportionate share of brokerage commissions incurred with respect 
to Investor 
Services Group's open market purchases in connection with the 
reinvestment of 
dividends or capital gains distributions. For the six months ended 
May 31, 1997, 
$6,131 in brokerage commissions were incurred. 
  
    The automatic reinvestment of dividends and capital gains 
distributions will 
not relieve Plan participants of any income tax that may be 
payable on the 
dividends or capital gains distributions. A participant in the 
Plan will be 
treated for Federal income tax purposes as having received, on the 
dividend 
payment date, a dividend or distribution in an amount equal to the 
cash that the 
participant could have received instead of shares. 
  
                                       21 
<PAGE> 
- ------------------------------------------------------------------
- -------------- 
Preferred Income Opportunity Fund Incorporated 
ADDITIONAL INFORMATION (UNAUDITED) (CONTINUED) 
- ------------------------------------------------------- 
  
    In addition to acquiring shares of Common Stock through the 
reinvestment of 
cash dividends and distributions, a shareholder may invest any 
further amounts 
from $100 to $3,000 semi-annually at the then current market price 
in shares 
purchased through the Plan. Such semi-annual investments are 
subject to any 
brokerage commission charges incurred. 
  
    A shareholder whose Common Stock is registered in his or her 
own name may 
terminate participation in the Plan at any time by notifying 
Investor Services 
Group in writing, by completing the form on the back of the Plan 
account 
statement and forwarding it to Investor Services Group or by 
calling Investor 
Services Group directly. A termination will be effective 
immediately if notice 
is received by Investor Services Group not less than 10 days 
before any dividend 
or distribution record date. Otherwise, the termination will be 
effective, and 
only with respect to any subsequent dividends or distributions, on 
the first day 
after the dividend or distribution has been credited to the 
participant's 
account in additional shares of the Fund. Upon termination and 
according to a 
participant's instructions, Investor Services Group will either 
(a) issue 
certificates for the whole shares credited to the shareholder's 
Plan account and 
a check representing any fractional shares or (b) sell the shares 
in the market. 
Shareholders who hold common stock registered in the name of a 
broker or other 
nominee should consult their broker or nominee to terminate 
participation. 
  
    The Plan is described in more detail in the Fund's Plan 
brochure. 
Information concerning the Plan may be obtained from Investor 
Services Group at 
1-800-331-1710. 
  
                                       22 
<PAGE> 
DIRECTORS 
  
  Martin Brody 
  Donald F. Crumrine, CFA 
  Robert T. Flaherty, CFA 
  David Gale 
  Morgan Gust 
  Robert F. Wulf, CFA 
  
OFFICERS 
  
  Robert T. Flaherty, CFA 
    Chairman of the Board 
    and President 
  
  Donald F. Crumrine, CFA 
    Vice President 
    and Secretary 
  
  Robert M. Ettinger, CFA 
    Vice President 
  
  Peter C. Stimes, CFA 
    Vice President 
    and Treasurer 
  
  Carl D. Johns 
    Assistant Treasurer 
  
INVESTMENT ADVISER 
  
   Flaherty & Crumrine Incorporated 
   e-mail: [email protected] 
  
QUESTIONS CONCERNING YOUR SHARES OF PREFERRED 
  INCOME OPPORTUNITY FUND? 
  
  - If your shares are held in a Brokerage 
    Account, contact your Broker. 
  
  - If you have physical possession of your shares in 
    certificate form, contact the Fund's Transfer 
    Agent & Shareholder Servicing Agent -- 
          First Data Investor Services Group, Inc. 
              P.O. Box 1376 
              Boston, MA 02104 
              1-800-331-1710 
  
THIS REPORT IS SENT TO SHAREHOLDERS OF 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. 
  
3202-SEM 
  
                                     [LOGO] 
  
                                  Semi-Annual 
                                     Report 
  
                                  May 31, 1997 





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