WARBURG PINCUS INSTITUTIONAL FUND INC
N-30D, 1995-07-05
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<PAGE>
                    [Logo]
 
                  SEMIANNUAL
                    REPORT

               APRIL 30, 1995

          [ ] WARBURG PINCUS INSTITUTIONAL FUND, INC. --
              INTERNATIONAL EQUITY PORTFOLIO

<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC. -- INTERNATIONAL EQUITY PORTFOLIO
- --------------------------------------------------------------------------------
 
                                                                   June 15, 1995
 
Dear Shareholder:
 
     The  objective of Warburg Pincus Institutional Fund -- International Equity
Portfolio (the 'Portfolio') is long-term capital appreciation and  international
diversification.  The Portfolio aims to tap  into the strong growth potential of
today's world stock markets by investing primarily in companies whose  principal
business activities and interests are outside the U.S.
 
     For  the six months ended  April 30, 1995, the  Portfolio fell 8.94%, vs. a
loss of 5.03% in the Lipper International Fund Index and a gain of 1.25% in  the
Morgan  Stanley  --  Europe, Australia  and  Far  East ('EAFE')  Index.  For the
trailing 12 months, the Portfolio lost 1.27%, vs. a loss of 1.31% in the  Lipper
Index  and a  gain of  5.59% in  the EAFE  Index. Shareholders  should note that
although the EAFE  Index outperformed  the Portfolio  in the  six- and  12-month
periods  ended April 30, the Portfolio's  long-term record is superior. From its
inception on September 1, 1992, through April 30, 1995, the Portfolio  generated
an  average annual return of  17.09%, compared to 14.15%  for the EAFE Index. In
addition, relative to  the Index,  the Portfolio's  diversification across  more
countries has historically provided a lower level of volatility.
 
     Foreign  markets displayed  considerable volatility  over the  past several
months, with  European  markets  on  balance  outperforming  their  Pacific  Rim
counterparts  in both  dollar and local-currency  terms. One  European market on
which we  are particularly  positive  is France,  which  represented 8%  of  the
Portfolio's  assets through April.  The French market has  been impacted by high
real interest rates, which  have largely been a  consequence of German  monetary
policies.  Recently, however, corporate  earnings have begun  to improve, and we
believe that our holdings will likely benefit from both continued  restructuring
efforts and the potential for a further easing of interest rates across Europe.
 
     Our  largest  country weighting  among Far  Eastern markets  remains Japan,
which comprised 25% of the Portfolio through April. While we think the  Japanese
market  will likely remain  volatile over the  short term, we  believe there are
many  attractively  priced  stocks  at  the  market's  current  level  based  on
traditional  long-term measures  of value (e.g.,  price relative  to book value,
sales and cash  flow). It  is inevitable that  Japan's government  will at  some
point be forced to pursue more expansionary economic policies, which should have
a direct and substantial impact on stock prices.
 
     Another  Pacific Rim market  we are emphasizing  is South Korea  (5% of the
Portfolio),  a  high-growth  emerging  market  that  suffered  unduly  following
Mexico's peso crisis in December. Other markets we favor due to their attractive
valuations  include Australia and  New Zealand, which  combined account for over
10% of the Portfolio.
 
Richard H. King
Portfolio Manager
 
                                                                      1
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF NET ASSETS
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                      SHARES         VALUE
                                                                                      ------         -----
<S>                                                                          <C>                  <C>
COMMON STOCK (87.1%)
  Argentina (2.5%)
     Banco De Galicia & Buenos Aires SA                                               90,505      $    371,516
     Banco De Galicia & Buenos Aires SA ADR                                           16,525           266,466
     Banco Frances del Rio de la Plata SA                                            107,200           681,538
     Banco Frances del Rio de la Plata SA ADR                                         90,300         1,659,263
     Capex SA GDR +                                                                  126,900         1,919,363
     YPF SA ADR                                                                      227,000         4,596,750
                                                                                                  ------------
                                                                                                     9,494,896
                                                                                                  ------------
 
  Australia (4.6%)
     BTR Nylex Ltd.                                                                2,534,425         4,940,689
     News Corp., Ltd.                                                                204,028           991,379
     Niugini Mining Ltd. +                                                           283,000           895,466
     Pasminco Ltd. +                                                               1,012,000         1,089,471
     Reinsurance Australia Corp., Ltd. +                                           1,788,600         3,122,466
     United Construction Group Ltd.                                                  300,000           139,661
     Woodside Petroleum Ltd.                                                       1,469,500         6,007,298
                                                                                                  ------------
                                                                                                    17,186,430
                                                                                                  ------------
 
  Austria (3.1%)
     Bohler-Uddeholm                                                                  47,600         2,843,483
     Maculan Holdings AG Vorzuege                                                      9,290           389,996
     V.A. Technologie AG +                                                            77,300         8,537,141
                                                                                                  ------------
                                                                                                    11,770,620
                                                                                                  ------------
 
  Denmark (0.5%)
     Copenhagen Airport                                                               18,524         1,195,097
     International Service System Class B                                             20,500           586,356
                                                                                                  ------------
                                                                                                     1,781,453
                                                                                                  ------------
 
  Finland (1.5%)
     Metsa-Serla Class B                                                             127,500         5,557,248
                                                                                                  ------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
2
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF NET ASSETS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                      SHARES         VALUE
                                                                                      ------         -----
COMMON STOCK (CONT'D)
<S>                                                                          <C>                  <C>
  France (8.2%)
     Bouygues                                                                         26,555      $  3,237,953
     Cetelem                                                                           8,879         1,877,920
     Fives-Lille (Compagnie De)                                                       26,740         2,558,331
     Lagardere Groupe                                                                237,000         5,321,343
     Scor SA                                                                         115,296         2,581,692
     Societe Nationale Elf Aquitaine SA                                                4,470           357,327
     Societe Nationale Elf Aquitaine SA ADR                                          178,400         7,091,400
     Total Cie Franc Des Petroles Class B                                            124,825         7,805,850
                                                                                                  ------------
                                                                                                    30,831,816
                                                                                                  ------------
 
  Hong Kong (2.2%)
     Hong Kong Electric                                                              559,000         1,715,610
     HSBC Holdings PLC                                                               255,700         2,965,571
     HSBC Holdings PLC (UK)                                                           35,000           412,379
     Jardine Matheson                                                                404,800         3,218,160
                                                                                                  ------------
                                                                                                     8,311,720
                                                                                                  ------------
 
  India (1.7%)
     Hindalco Industries Ltd. GDR                                                    148,000         3,922,000
     Reliance Industries Ltd. GDS                                                    153,000         2,467,125
                                                                                                  ------------
                                                                                                     6,389,125
                                                                                                  ------------
 
  Indonesia (0.7%)
     P.T. Dynaplast Ltd.                                                             340,800           366,616
     P.T. Modern Photo Film Co.                                                      280,000         1,173,465
     P.T. Tri Polyta Indonesia ADR +                                                  51,600         1,109,400
                                                                                                  ------------
                                                                                                     2,649,481
                                                                                                  ------------
 
  Israel (0.8%)
     Ampal-American Israel Corp. Class A +                                           233,000         1,485,375
     ECI Telecommunications Ltd.                                                      85,000         1,434,375
                                                                                                  ------------
                                                                                                     2,919,750
                                                                                                  ------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
                                                                            3
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF NET ASSETS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                      SHARES         VALUE
                                                                                      ------         -----
COMMON STOCK (CONT'D)
<S>                                                                          <C>                  <C>
  Japan (24.5%)
     Canon Inc.                                                                      360,000      $  5,957,143
     Canon Inc. ADR                                                                   25,200         2,101,050
     DDI Corp.                                                                           972         8,562,857
     East Japan Railway Co.                                                            1,813         9,431,917
     Fujitsu Ltd.                                                                    385,000         3,937,083
     Hitachi Ltd.                                                                    337,750         3,437,813
     Japan Securities Finance Co., Ltd.                                              208,000         3,268,571
     Kao Corp.                                                                       510,000         6,192,857
     Kirin Beverage                                                                   35,000           545,833
     Murata Mfg. Co., Ltd.                                                            33,290         1,339,526
     NEC Corp.                                                                        20,000           221,429
     Nippon Communication Systems Corp.                                              275,300         3,834,536
     Nippon Express Co., Ltd.                                                        221,000         2,186,321
     Nippon Telegraph & Telephone Corp.                                                  863         7,633,440
     Sankyo Co., Ltd. (Gunma)                                                         19,000         1,101,548
     Seikisui House Ltd.                                                             282,000         3,726,429
     Shin-Etsu Chemical Co., Ltd.                                                    345,600         6,706,286
     Sony Corp.                                                                       77,200         3,896,762
     Sony Corp. ADR                                                                   36,900         1,877,288
     TDK Corp.                                                                       158,000         7,222,857
     Toho Co., Ltd.                                                                   22,000         3,954,762
     Tsuchiya Home Co.                                                                89,180         1,539,417
     York-Benimaru Co., Ltd.                                                          81,500         3,221,190
                                                                                                  ------------
                                                                                                    91,896,915
                                                                                                  ------------
  Korea (4.7%)
     Daewoo Heavy Industries                                                          83,394         1,028,340
     Hana Bank                                                                        82,200         1,477,292
     Hanil Bank                                                                      372,373         4,701,679
     Korea Electric Power Corp.                                                       72,300         2,778,471
     Korea Europe Fund Ltd.                                                              289         1,029,563
     Korea Long Term Credit Bank                                                      42,368         1,289,719
     Samsung Electronics Co., Ltd.                                                    10,328         1,792,572
     Samsung Electronics Co., Ltd. GDR                                                18,964           933,957
     Samsung Heavy Industries Co., Ltd.                                               82,010         2,452,877
                                                                                                  ------------
                                                                                                    17,484,470
                                                                                                  ------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
4
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF NET ASSETS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                      SHARES         VALUE
                                                                                      ------         -----
COMMON STOCK (CONT'D)
<S>                                                                          <C>                  <C>
  Malaysia (0.4%)
     Arab-Malaysian Merchant Bank BHD                                                 24,000      $    237,210
     Westmont BHD                                                                    322,000         1,395,633
                                                                                                  ------------
                                                                                                     1,632,843
                                                                                                  ------------
 
  Mexico (1.8%)
     Cemex SA de CV ADR                                                              526,062         3,287,887
     Grupo Financiero Banamex Accival SA de CV Class B                                30,000            50,400
     Grupo Financiero Banamex Accival SA de CV Class C                               586,500           977,500
     Telefonos de Mexico SA de CV ADR                                                 86,400         2,613,600
                                                                                                  ------------
                                                                                                     6,929,387
                                                                                                  ------------
 
  New Zealand (5.6%)
     Brierley Investments Ltd.                                                     6,263,583         4,719,134
     Fletcher Challenge Ltd.                                                       2,244,050         6,038,290
     Fletcher Forestry                                                             1,497,900         2,095,886
     Lion Nathan Ltd.                                                              2,446,700         5,332,700
     Wrightson Ltd.                                                                3,271,735         2,641,075
                                                                                                  ------------
                                                                                                    20,827,085
                                                                                                  ------------
 
  Norway (2.1%)
     Norsk Hydro AS ADR                                                              198,144         7,950,528
                                                                                                  ------------
  Pakistan (0.5%)
     Pakistan Telecommunications Corp.                                                   345            37,713
     Pakistan Telecommunications Corp. GDR +                                          16,000         1,672,000
                                                                                                  ------------
                                                                                                     1,709,713
                                                                                                  ------------
 
  Singapore (1.8%)
     DBS Land Ltd.                                                                   741,500         2,043,755
     Development Bank of Singapore Ltd.                                              176,562         1,888,296
     Development Bank of Singapore Ltd. ADR                                           34,750         1,489,906
     IPC Corp., Ltd. +                                                             2,216,000         1,192,937
                                                                                                  ------------
                                                                                                     6,614,894
                                                                                                  ------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
                                                                             5
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF NET ASSETS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                      SHARES         VALUE
                                                                                      ------         -----
COMMON STOCK (CONT'D)
<S>                                                                          <C>                  <C>
  South Africa (0.0%)
     Anglovaal Ltd.                                                                    4,800      $    164,443
                                                                                                  ------------
 
  Spain (3.6%)
     Banco De Santander                                                               30,300         1,108,657
     Banco De Santander ADR                                                          220,300         7,985,875
     Repsol SA ADR                                                                   133,700         4,278,400
                                                                                                  ------------
                                                                                                    13,372,932
                                                                                                  ------------
 
  Sweden (3.4%)
     Asea AB Series B                                                                 42,000         3,536,501
     Astra AB Series B                                                               168,750         4,806,039
     Celsius Industrier Series B                                                     117,550         1,843,744
     Foreningsbanken AB Series A +                                                 1,378,000         2,388,872
                                                                                                  ------------
                                                                                                    12,575,156
                                                                                                  ------------
 
  Switzerland (2.0%)
     BBC Brown Boveri AG                                                               6,594         6,513,375
     Danzas Holding AG                                                                 1,369         1,123,895
                                                                                                  ------------
                                                                                                     7,637,270
                                                                                                  ------------
  Taiwan (1.2%)
     Baring International Taiwan Fund +                                              100,000         1,000,000
     Evergreen Marine Corp., Ltd. +                                                  381,000           795,031
     Kwang Hua Growth Fund                                                           346,000           153,935
     Tuntex Distinct Corp.                                                           965,945         1,110,500
     Tuntex Distinct Corp. GDS +                                                     127,312         1,464,088
                                                                                                  ------------
                                                                                                     4,523,554
                                                                                                  ------------
  Thailand (1.1%)
     Industrial Finance Corp. of Thailand                                          1,535,832         3,288,384
     Thai Military Bank Ltd.                                                         244,050           786,295
                                                                                                  ------------
                                                                                                     4,074,679
                                                                                                  ------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
6
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF NET ASSETS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                      SHARES         VALUE
                                                                                      ------         -----
COMMON STOCK (CONT'D)
<S>                                                                          <C>                  <C>
  United Kingdom (8.6%)
     AAF Industries PLC +                                                            208,500      $    117,380
     British Air Authority PLC                                                       661,020         5,039,808
     BTR PLC                                                                       1,183,400         6,262,511
     Govett and Co., Ltd.                                                            606,000         2,797,535
     International Cabletel Inc.                                                       5,500           162,250
     Queens Moat Houses PLC +                                                        646,700                 0
     Reckitt & Colman PLC                                                            416,500         4,294,317
     Singer and Friedlander Group PLC                                              2,210,000         2,986,019
     Takare PLC                                                                    1,182,900         3,786,362
     Thorn EMI PLC                                                                   339,362         6,206,471
     Trio Holdings PLC                                                             1,648,500           437,516
                                                                                                  ------------
                                                                                                    32,090,169
                                                                                                  ------------
  Zimbabwe (0.0%)
     Delta Corp., Ltd.                                                                10,500           146,867
                                                                                                  ------------
TOTAL COMMON STOCK (Cost $311,890,037)                                                             326,523,444
                                                                                                  ------------
 
PREFERRED STOCK (1.2%)
  Australia (0.4%)
     News Corp.                                                                      350,825         1,549,006
                                                                                                  ------------
  Austria (0.3%)
     Maculan Holdings AG Vorzuege                                                     31,100         1,283,238
                                                                                                  ------------
  Korea (0.3%)
     Samsung Electronics Co., Ltd.                                                    12,135         1,092,651
                                                                                                  ------------
  United Kingdom (0.2%)
     Queens Moat Houses PLC, 7.50% Convertible +                                      15,300                 0
     Singer & Friedlander Group PLC, 8.50% Convertible                               348,947           593,555
                                                                                                  ------------
                                                                                                       593,555
                                                                                                  ------------
TOTAL PREFERRED STOCK (Cost $5,225,258)                                                              4,518,450
                                                                                                  ------------
 
STOCK RIGHTS AND WARRANTS (0.2%)
  India (0.1%)
     Hindalco Industries Ltd. Wts., 11/02/95 +                                        36,500           419,750
                                                                                                  ------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
                                                                            7
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF NET ASSETS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                      SHARES         VALUE
                                                                                      ------         -----
 
STOCK RIGHTS AND WARRANTS (CONT'D)
<S>                                                                          <C>                  <C>
  Israel (0.0%)
     Ampal-American Israel Corp. Class A Wts., 01/31/99 +                             95,000      $     50,469
                                                                                                  ------------
  Japan (0.1%)
     Bandai Industries Wts., 11/04/97 +                                                  440           220,000
                                                                                                  ------------
  Switzerland (0.0%)
     Danzas Holding AG Wts., 08/02/96 +                                                2,000             1,310
                                                                                                  ------------
  Thailand (0.0%)
     Thai Military Bank Rts., 05/08/95 +                                              48,810            97,540
                                                                                                  ------------
 
TOTAL STOCK RIGHTS AND WARRANTS (Cost $876,769)                                                        789,069
                                                                                                  ------------
 
OPTIONS (0.4%)                                                                     CONTRACTS
                                                                             ---------------
  Japan (0.3%)
     Topix Index, 03/08/96, strike price 1,251.24 +                                    3,647           497,597
     Topix Index, 03/08/96, strike price 1,261.12 +                                    3,755           486,160
     Topix Index, 03/08/96, strike price 1,349.00 +                                    1,830           139,085
                                                                                                  ------------
                                                                                                     1,122,842
                                                                                                  ------------
  Korea (0.1%)
     Korea Composite Index, 09/24/95 +                                             1,500,000           338,550
                                                                                                  ------------
  Mexico (0.0%)
     Mexican Index, 09/95 +                                                               48             1,200
     Mexican Inmex, 03/29/96 +                                                        62,434             1,249
                                                                                                  ------------
                                                                                                         2,449
                                                                                                  ------------
TOTAL OPTIONS (Cost $1,626,261)                                                                      1,463,841
                                                                                                  ------------
 
CONVERTIBLE BONDS/NOTES (4.3%)
                                                                                         PAR
                                                                                        ----
  Argentina (0.3%)
     Banco De Galicia 7.00%, 08/01/02                                           $  1,574,000         1,101,800
                                                                                                  ------------
  Australia (0.2%)
     BTR Nylex 9.00%, 11/30/49                                               (C)  11,200,000           888,010
                                                                                                  ------------
  India (0.1%)
     Reliance Industries Ltd. 3.50%, 11/03/99                                   $    500,000           505,000
                                                                                                  ------------
  Japan (1.8%)
     Matsushita Electric Works Ltd. 2.70%, 05/31/02                          (B) 501,000,000         6,650,179
                                                                                                  ------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
8
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF NET ASSETS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                                         PAR         VALUE
                                                                                      ------         -----
 
<S>                                                                          <C>                  <C>
CONVERTIBLE BONDS/NOTES (CONT'D)
  New Zealand (0.2%)
     Brierley Investments Ltd. 9.00%, 06/30/98                               (A)   1,028,875      $    705,967
                                                                                                  ------------
  Taiwan (1.7%)
     United Microelectronics Corp. 1.25%, 06/08/04                              $  1,790,000         2,814,775
     Yang Ming Marine Transport Corp. 2.00%, 10/06/01                              3,372,000         3,456,300
                                                                                                  ------------
                                                                                                     6,271,075
                                                                                                  ------------
TOTAL CONVERTIBLE BONDS/NOTES (Cost $14,556,972)                                                    16,122,031
                                                                                                  ------------
 
SHORT-TERM INVESTMENTS (7.2%)
    Repurchase agreement with State Street Bank & Trust Co. dated 04/28/95
    at 5.87% to be repurchased at $27,144,272 on 05/01/95. (Collateralized
    by $27,470,000 U.S. Treasury Note 6.25%, due 08/31/96, with a market
    value of $27,676,025.) (Cost $27,131,000)                                     27,131,000        27,131,000
                                                                                                  ------------
TOTAL INVESTMENTS AT VALUE (100.4%) (Cost $361,306,297*)                                           376,547,835
OTHER LIABILITIES IN EXCESS OF ASSETS (0.4%)                                                       (1,458,789)
                                                                                                  ------------
NET ASSETS (100.0%) (applicable to 26,495,950 shares)                                             $375,089,046
                                                                                                  ------------
                                                                                                  ------------
NET ASSET VALUE, offering and redemption price per share
  ($375,089,046[div]26,495,950)                                                                         $14.16
                                                                                                        ------
                                                                                                        ------
</TABLE>
 
+ Non-income producing security.
* Also cost for Federal income tax purposes.
 
  Unless as otherwise indicated below, all Convertible Bonds/Notes are
  denominated in $U.S.
(A) Denominated in New Zealand Dollars.
(B) Denominated in Japanese Yen.
(C) Denominated in Australian Dollars.
 
                            See Accompanying Notes to Financial Statements.
                                                                             9
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENT OF OPERATIONS
For the Six Months Ended April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                                                                  <C>
INVESTMENT INCOME:
     Dividends (net of foreign taxes withheld of $431,424)                                           $  2,592,602
     Interest                                                                                           1,173,175
                                                                                                     ------------
 
          Total investment income                                                                       3,765,777
                                                                                                     ------------
EXPENSES:
     Investment advisory                                                                                1,276,260
     Administrative services                                                                              343,860
     Audit                                                                                                 10,989
     Custodian/Sub-custodian                                                                              164,491
     Directors                                                                                              3,719
     Insurance                                                                                              4,194
     Legal                                                                                                  9,918
     Organizational                                                                                        10,561
     Printing                                                                                               9,518
     Registration                                                                                          66,274
     Transfer agent                                                                                        16,255
     Miscellaneous                                                                                          4,998
                                                                                                     ------------
                                                                                                        1,921,037
 
     Less fees waived                                                                                    (405,478)
                                                                                                     ------------
 
          Total expenses                                                                                1,515,559
                                                                                                     ------------
 
               Net investment income                                                                    2,250,218
                                                                                                     ------------
 
NET REALIZED AND UNREALIZED LOSS FROM INVESTMENTS AND
  FOREIGN CURRENCY RELATED ITEMS:
 
     Net realized loss from security transactions                                                      (6,965,517)
     Net realized gain from foreign currency related items                                                686,529
     Net change in unrealized appreciation (depreciation) from investments and
       foreign currency related items                                                                 (23,573,523)
                                                                                                     ------------
               Net realized and unrealized loss from investments and
                 foreign currency related items                                                       (29,852,511)
                                                                                                     ------------
 
               Net decrease in net assets resulting from operations                                  $(27,602,293)
                                                                                                     ------------
                                                                                                     ------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
10
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<PAGE>
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WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
STATEMENTS OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                   For the Six
                                                                                   Months Ended         For the
                                                                                  April 30, 1995       Year Ended
                                                                                   (Unaudited)      October 31, 1994
                                                                                  --------------    ----------------
 
<S>                                                                               <C>               <C>
FROM OPERATIONS:
 
     Net investment income                                                         $   2,250,218      $  1,276,813
     Net realized gain (loss) from security transactions                              (6,965,517)       11,710,325
     Net realized gain (loss) from foreign currency related items                        686,529          (456,151)
     Net change in unrealized appreciation (depreciation) from investments and
       foreign currency related items                                                (23,573,523)       22,452,714
                                                                                  --------------    ----------------
          Net increase (decrease) in net assets resulting from operations            (27,602,293)       34,983,701
                                                                                  --------------    ----------------
 
FROM DISTRIBUTIONS:
 
     Dividends from net investment income                                             (3,614,604)         (526,855)
     Distributions from capital gains                                                (11,710,991)       (1,146,187)
                                                                                  --------------    ----------------
          Net decrease from distributions                                            (15,325,595)       (1,673,042)
                                                                                  --------------    ----------------
 
FROM CAPITAL SHARE TRANSACTIONS:
 
     Proceeds from sale of shares                                                     99,767,308       196,715,545
     Reinvested dividends                                                             13,607,234         1,270,243
     Net asset value of shares redeemed                                              (26,654,820)       (9,279,255)
                                                                                  --------------    ----------------
          Net increase in net assets from capital share
            transactions                                                              86,719,722       188,706,533
                                                                                  --------------    ----------------
          Net increase in net assets                                                  43,791,834       222,017,192
 
NET ASSETS:
 
     Beginning of period                                                             331,297,212       109,280,020
                                                                                  --------------    ----------------
 
     End of period                                                                 $ 375,089,046      $331,297,212
                                                                                  --------------    ----------------
                                                                                  --------------    ----------------
</TABLE>
 
                            See Accompanying Notes to Financial Statements.
                                                                            11
- --------------------------------------------------------------------------------
 
<PAGE>
- --------------------------------------------------------------------------------
WARBURG PINCUS INSTITUTIONAL FUND, INC.  --  INTERNATIONAL EQUITY PORTFOLIO
FINANCIAL HIGHLIGHTS
(For a Share of the Fund Outstanding Throughout Each Period)
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                        For the Six
                                                        Months Ended     For the Year Ended       September 1, 1992
                                                         April 30,           October 31,          (Commencement of
                                                            1995        ---------------------    Operations) through
                                                        (Unaudited)      1994         1993        October 31, 1992
                                                        ------------    -------    ----------    -------------------
<S>                                                     <C>             <C>        <C>           <C>
NET ASSET VALUE, BEGINNING OF PERIOD                       $16.34       $ 13.49      $ 9.62            $ 10.00
                                                        ------------    -------    ----------          -------
     Income from Investment Operations:
     Net Investment Income                                    .12           .17         .10                .02
     Net Gain (Loss) from Securities and Foreign
       Currency Related Items (both realized and
       unrealized)                                          (1.55)         2.87        3.87               (.40)
                                                        ------------    -------    ----------          -------
          Total From Investment Operations                  (1.43)         3.04        3.97               (.38)
                                                        ------------    -------    ----------          -------
     Less Distributions:
     Dividends from net investment income                    (.18)         (.07)       (.10)               .00
     Distributions from capital gains                        (.57)         (.12)        .00                .00
                                                        ------------    -------    ----------          -------
          Total Distributions                                (.75)         (.19)       (.10)               .00
                                                        ------------    -------    ----------          -------
NET ASSET VALUE, END OF PERIOD                             $14.16       $ 16.34      $13.49            $  9.62
                                                        ------------    -------    ----------          -------
                                                        ------------    -------    ----------          -------
Total Return                                               (17.10%)*      22.62%      41.61%            (20.69%)*
 
RATIOS/SUPPLEMENTAL DATA:
 
Net Assets, End of Period (000s)                         $375,089       $331,297   $109,280            $18,613
Ratios to average daily net assets:
     Operating expenses                                       .95%*         .95%        .95%               .95%*
     Net investment income                                   1.41%*         .59%        .75%              1.22%*
     Decrease reflected in above expense ratios due
       to waivers/reimbursements                              .25%*         .29%        .44%               .85%*
Portfolio turnover rate                                     25.43%*       19.34%      19.40%             50.16%
</TABLE>
 
* Annualized
 
12
- --------------------------------------------------------------------------------

<PAGE>
- --------------------------------------------------------------------------------
WARBURG PINCUS INSTITUTIONAL FUND, INC.
NOTES TO FINANCIAL STATEMENTS
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
 
1. SIGNIFICANT ACCOUNTING POLICIES
 
     Warburg  Pincus  Institutional  Fund,  Inc.  (the  'Fund')  is  an open-end
management investment company and currently offers two managed investment  funds
(the   'Portfolios'):  the  International   Equity  Portfolio,  which  commenced
operations on September 1, 1992,  which seeks long-term capital appreciation  by
investing in equity securities of principally non-United States issuers; and the
Global  Fixed Income  Portfolio, which  as of April  30, 1995  had not commenced
operations, which  seeks to  maximize total  investment return  consistent  with
prudent   investment  management  while  preserving   capital  by  investing  in
investment grade  fixed  income  securities of  issuers  throughout  the  world,
including United States issuers.
 
     The net asset values of the Portfolios are determined daily as of the close
of  regular trading on the  New York Stock Exchange.  The Fund's investments are
valued at market value,  which is currently determined  using the last  reported
sales  price. If no sales are reported,  investments are generally valued at the
last reported bid price.  In the absence of  market quotations, investments  are
generally  valued at fair value  as determined by or  under the direction of the
Fund's Board of Directors. Short-term investments that mature in 60 days or less
are valued on the basis of amortized cost, which attempts to approximate  market
value.
 
     The  books and  records of the  Portfolios are maintained  in U.S. dollars.
Transactions denominated  in  foreign currencies  are  recorded at  the  current
prevailing  exchange rates.  All assets  and liabilities  denominated in foreign
currencies are translated into U.S. dollar amounts at the current exchange rate.
Translation gains or losses resulting from  changes in the exchange rate  during
the  reporting period and realized gains and losses on the settlement of foreign
currency transactions are reported in the results of operations for the  current
period.  The  Fund  does  not  isolate  that  portion  of  gains  and  losses on
investments in equity securities which is due to changes in the foreign exchange
rate from that which is due to changes in market prices of equity securities.
 
     Security transactions are accounted for  on trade date. Interest income  is
recorded  on the accrual basis. Dividends  are recorded on the ex-dividend date.
The  cost  of   investments  sold  is   determined  by  use   of  the   specific
indentification method for both financial reporting and income tax purposes.
 
     Dividends  from  net  investment  income are  declared  and  paid annually.
Distributions of  net realized  capital gains,  if any,  are declared  annually.
However,  to the  extent that a  net realized capital  gain can be  reduced by a
capital loss carryover, such  gain will not be  distributed. Income and  capital
gain  distributions  are  determined  in  accordance  with  Federal  income  tax
regulations which may differ from generally accepted accounting principles.
 
     The Fund intends to continue to  comply with the special provisions of  the
Internal Revenue Code available to investment companies and therefore no Federal
income tax provision is required.
 
     Costs incurred by the Portfolios in connection with their organization have
been  deferred and are  amortized over a period  of five years  from the date of
each Portfolio's commencement of operations.
 
                                                                     13
- --------------------------------------------------------------------------------
 
<PAGE>
- --------------------------------------------------------------------------------
WARBURG PINCUS INSTITUTIONAL FUND, INC.
NOTES TO FINANCIAL STATEMENTS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
 
     Each Portfolio may enter into repurchase agreement transactions. Under  the
terms  of a  typical repurchase  agreement, a  Portfolio acquires  an underlying
security subject to an obligation of the seller to repurchase. The value of  the
underlying security collateral will be maintained at an amount at least equal to
the  total amount of the purchase obligation, including interest. The collateral
is in the Portfolio's possession.
 
2. INVESTMENT ADVISER, CO-ADMINISTRATORS AND DISTRIBUTOR
 
     Warburg,  Pincus  Counsellors,   Inc.  ('Counsellors'),   a  wholly   owned
subsidiary  of Warburg, Pincus Counsellors  G.P. ('Counsellors G.P.'), serves as
the Portfolios'  investment adviser.  The  International Equity  Portfolio  pays
Counsellors  an investment advisory fee calculated at  an annual rate of .80% of
the Portfolio's average  daily net assets.  For the six  months ended April  30,
1995,  Counsellors  earned $1,276,260  for investment  advisory services  to the
International Equity Portfolio,  of which $352,604  was voluntarily waived.  The
Global  Fixed Income Portfolio  will pay Counsellors  an investment advisory fee
calculated at  an annual  rate of  .65%  of the  Portfolio's average  daily  net
assets.
 
     Counsellors  Funds  Service, Inc.  ('CFSI'), a  wholly owned  subsidiary of
Counsellors, and PFPC Inc. ('PFPC'), an indirect, wholly owned subsidiary of PNC
Bank  Corp.   ('PNC'),  serve   as  the   Fund's  co-administrators.   For   its
administrative  services, CFSI  receives a fee  calculated at an  annual rate of
 .10% of the Fund's average daily net assets. For the six months ended April  30,
1995,  CFSI earned $159,533 in administrative  services fees. For the six months
ended April 30,  1995,  PFPC  earned $184,327 and voluntarily waived $52,874  in
administrative services fees.
 
     Counsellors  Securities  Inc. ('CSI'),  also a  wholly owned  subsidiary of
Counsellors, acts as distributor of the International Equity Portfolio's shares.
No compensation is payable by the International Equity Portfolio to CSI for  its
distribution services.
 
3. INVESTMENTS IN SECURITIES
 
     The  International  Equity Portfolio's  purchases  and sales  of investment
securities for  the  six  months  ended April  30,  1995  (excluding  short-term
investments) were $110,048,718 and $37,695,785, respectively.
 
     At  April 30, 1995, with respect to the International Equity Portfolio, the
net unrealized appreciation  from investments  of $15,241,538  was comprised  of
appreciation  of $39,391,026 for those securities having an excess of value over
cost, and depreciation of $24,149,488 for  those securities having an excess  of
cost over value (based on cost for Federal income tax purposes).
 
4. FOREIGN FORWARD CURRENCY CONTRACTS
 
     The  Portfolios may enter into forward  currency contracts for the purchase
or sale of a specific foreign currency at a fixed price on a future date.  Risks
may arise upon entering into these contracts
 
14
- --------------------------------------------------------------------------------
 
<PAGE>
- --------------------------------------------------------------------------------
WARBURG PINCUS INSTITUTIONAL FUND, INC.
NOTES TO FINANCIAL STATEMENTS (CONT'D)
April 30, 1995 (Unaudited)
- --------------------------------------------------------------------------------
from  the  potential inability  of  counterparties to  meet  the terms  of their
contracts and from unanticipated  movements in the value  of a foreign  currency
relative to the U.S. dollar. The Portfolios may enter into forward contracts for
hedging  purposes or to  increase income and total  return. The forward currency
contracts are adjusted by the daily exchange rate of the underlying currency and
any gains or losses are recorded for financial statement purposes as  unrealized
until the contract settlement date.
 
     At April 30, 1995, the Fund had the following open forward foreign currency
contract and had recorded an unrealized loss of $284,063:
 
<TABLE>
<CAPTION>
SETTLEMENT             CURRENCY                     CURRENCY
   DATE                 BOUGHT                        SOLD
- ----------      ----------------------      ------------------------
 
<S>             <C>                         <C>
 06/21/95       9,400,000 U.S. Dollars      807,554,000 Japanese Yen
</TABLE>
 
5. CAPITAL SHARE TRANSACTIONS
 
     The  Fund is authorized  to issue up  to three billion  full and fractional
shares of beneficial interest  of separate series having  a $.001 par value  per
share.  Shares of two series have been authorized, which constitute the interest
in the Portfolios.
 
     Transactions in  shares  of  the International  Equity  Portfolio  were  as
follows:
 
<TABLE>
<CAPTION>
                                                                          For the Six
                                                                          Months Ended        For the
                                                                         April 30, 1995      Year Ended
                                                                          (Unaudited)     October 31, 1994
                                                                         --------------   ----------------
 
<S>                                                                      <C>              <C>
Shares sold                                                                 7,119,069        12,686,666
Shares issued to shareholders on reinvestment of dividends                    939,078            85,000
Shares redeemed                                                            (1,831,230)         (603,362)
                                                                         --------------   ----------------
Net increase in shares outstanding                                          6,226,917        12,168,304
                                                                         --------------   ----------------
                                                                         --------------   ----------------
</TABLE>
 
6. NET ASSETS
 
     Net  assets  of  the  International Equity  Portfolio  at  April  30, 1995,
consisted of the following:
 
<TABLE>
<S>                                                                                      <C>
Capital contributed, net                                                                 $367,175,798
Accumulated net investment income                                                           2,541,665
Accumulated net realized loss from security transactions                                   (9,601,309)
Net unrealized appreciation from investments and foreign currency related items            14,972,892
                                                                                         ------------
Net assets                                                                               $375,089,046
                                                                                         ------------
                                                                                         ------------
</TABLE>
 
                                                                     15
- --------------------------------------------------------------------------------

<PAGE>
FURTHER INFORMATION IS CONTAINED IN
THE PROSPECTUS, WHICH MUST PRECEDE OR
ACCOMPANY THIS REPORT.
 
WARBURG PINCUS FUNDS
P.O. BOX 9030
BOSTON, MASSACHUSETTS 02205-9030
 
SHAREHOLDER SERVICES
1-800-888-6878
 
PROSPECTUSES
1-800-257-5614
 
                 [LOGO]
 
               SEMIANNUAL
                 REPORT
 
              APRIL 30, 1995
 
           [ ] WARBURG PINCUS
               INSTITUTIONAL FUND, INC. --
               INTERNATIONAL EQUITY PORTFOLIO
 
        COUNSELLORS SECURITIES INC., DISTRIBUTOR
 
                                                                WPINS-3-0495



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