MORGAN STANLEY DEAN WITTER CONVERTIBLE SECURITIES TRUST
N-30B-2, 1999-06-07
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MORGAN STANLEY DEAN WITTER

         MORGAN STANLEY DEAN WITTER
         INSTITUTIONAL FUND, INC.
         FIRST QUARTER REPORT
         MARCH 31, 1999
[LOGO]
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
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TABLE OF CONTENTS
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<TABLE>
<S>                                           <C>
President's Letter..........................          1
Performance Summary.........................          2
Letters to Shareholders and Investments by
  Portfolio:
Global and International Equity Portfolios:
  Active International Allocation...........          4
  Asian Equity..............................         13
  Asian Real Estate.........................         18
  Emerging Markets..........................         22
  European Equity ..........................         30
  European Real Estate......................         34
  Global Equity ............................         38
  International Equity .....................         43
  International Magnum .....................         47
  International Small Cap...................         53
  Japanese Equity...........................         57
  Latin American............................         61
U.S. Equity Portfolios:
  Aggressive Equity.........................         65
  Emerging Growth...........................         69
  Equity Growth.............................         73
  Technology................................         78
  U.S. Equity Plus..........................         81
  U.S. Real Estate..........................         88
  Value Equity..............................         94
Fixed Income Portfolios:
  Emerging Markets Debt.....................         99
  Fixed Income..............................        105
  Global Fixed Income.......................        109
  High Yield................................        113
  Municipal Bond............................        118
Directors and Officers .....................        120
</TABLE>

Daily net asset values and monthly updates, including certain portfolio
characteristics, for each portfolio can now be accessed at
www.msdw.com/institutional/investmentmanagement.

Portfolio information for the Money Market and Municipal Money Market Portfolios
is provided in the semi-annual and annual reports to shareholders.

This report is authorized for distribution only when preceded or accompanied by
prospectuses of the Morgan Stanley Dean Witter Institutional Fund, Inc.
Prospectuses describe in detail each of the Portfolio's investment policies to
the prospective investor. Please read the prospectuses carefully before you
invest or send money.

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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
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PRESIDENT'S LETTER
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Fellow Shareholders:

    We are pleased to present to you the Fund's Quarterly Report for the quarter
ended March 31, 1999. This quarter, we have combined the commentaries and
portfolio holdings for the Fund's 24 individual portfolios into one report along
the lines of our Semi-Annual and Annual Reports. We hope you find the format
both informative and "user-friendly".

MARKET REVIEW

    The first quarter of 1999 was a period of uncertainty for the global
economy. Although fourth quarter strength and optimism continued in the United
States and Europe well into mid-January, markets turned cautious amidst concerns
regarding earnings disappointments and Brazil's currency devaluation and
financial crisis. However, by early March, economic worries in the U.S. abated,
when earnings announcements remained solid, consumer spending held steady,
strong growth continued without substantial inflationary or wage pressures and
the financial situation in Brazil appeared to stabilize. Equity markets finished
the quarter with firm gains, driven primarily by performance in March.

    Leading the developed equity markets in the first quarter was Japan, which
rose 12.2% in U.S. dollar terms, driven by increased investor optimism
surrounding corporate restructuring. Asian markets also fared well, with the
Pacific ex-Japan region rising 6.1% also in U.S. dollar terms. Emerging markets
were surprisingly strong in the first quarter, despite the Brazilian
devaluation. Markets generally fell in the weeks immediately before and after
the devaluation. However, investors were quickly comforted by the seemingly
contained nature of the crisis, the strength and stability of Brazil's financial
sector, and relatively decisive steps taken by the government. Large cap US
equities were also strong, as the S&P 500 rose 5.0% in the first quarter. Mid
and small cap equities in the U.S. continued to lag, as the Russell 2500 Index
returned -4.7%. Of the developed market regions, Euroland was the laggard in the
first quarter, falling -1.5% in U.S. dollar terms (+4.9% in Euro terms).
Euroland equities were held back over concerns regarding earnings, high
unemployment, and uncertainty about the direction of interest rates. The
resignation in Germany of LaFontaine in late March opened the door for an
interest rate ease by the European Central Bank (ECB) (which occurred in early
April), but equity prices remained somewhat stagnant, concerned with a
combination of high valuations and sluggish economic performance.

    Bonds suffered globally during the first quarter, as yields rose in response
to stronger economic growth prospects. In the U.S., the Lehman Aggregate Bond
Index fell -0.5% for the quarter. Corporate, mortgage and high yield bond
spreads continued to tighten during the quarter, reflecting confidence in
economic growth and a return to a more normal risk environment.

    While prospects for the global economy had brightened by the end of the
quarter, economic growth remained concentrated in the U.S. Although the Yen
briefly strengthened in January, it had pulled back by March. Likewise, the
newborn Euro also weakened against the dollar, falling from 1.16 to 1.078 by the
end of the quarter.

MARKET OUTLOOK

    We view global macro fundamentals as remaining in the sweet spot for
financial markets with continued growth and subdued inflation. The world
manufacturing slowdown triggered by the emerging market crises of 1997-1999
appears to have ended with most global leading indicators pointing to a recovery
in manufacturing growth. World growth, and, therefore, earnings growth, should
benefit from the combination of strong consumption and renewed manufacturing
activity. Both U.S. and European earnings should grow between 5%-10%, with the
U.S. outperforming Europe. The Japanese economy appears to have flattened out
but sustainable economic growth is still questionable. Still, recurring profits
for Japanese corporates are expected to grow from this past year's depressed
levels.

    Equity market valuations look threatening, particularly in the U.S. However,
in the absence of a change in the current steady growth/subdued inflation
environment, the bias for equities remains upward, particularly given the number
of monetary easings we have witnessed. Among the risk factors we are tracking
are renewed inflationary pressures spurred by the bottoming in manufacturing
activity in most regions and very high levels of speculative optimism, which
could trigger a correction.

    In this Report, each of our portfolio managers discuss the performance
results and outlook of their markets and portfolios in greater detail. As noted
above, we hope you find the Report informative. As always, we very much
appreciate your continued support of the Fund.

Sincerely,

/s/Michael F. Klein

Michael F. Klein
PRESIDENT

April 1999

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                                       1
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
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PERFORMANCE SUMMARY
MARCH 31, 1999
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<TABLE>
<CAPTION>
                                                      NET ASSETS        NET ASSET VALUE
                              INCEPTION DATES           (000)              PER SHARE            YTD TOTAL RETURN
                             ------------------  --------------------  -----------------   ---------------------------
                                                                                                                 COMPARABLE
                             CLASS A   CLASS B    CLASS A    CLASS B   CLASS A   CLASS B   CLASS A   CLASS B      INDICES
                             --------  --------  ----------  --------  -------   -------   -------   -------   --------------
<S>                          <C>       <C>       <C>         <C>       <C>       <C>       <C>       <C>       <C>       <C>
GLOBAL AND INTERNATIONAL EQUITY
 PORTFOLIOS:
  Active International
   Allocation                 1/17/92   1/02/96  $  423,374  $   472   $12.04    $12.19      1.18%     0.58%     1.39%   (1)
  Asian Equity                7/01/91   1/02/96      50,577    1,468     8.17      8.11      2.00      1.76      5.02    (2)
  Asian Real Estate          10/01/97  10/01/97       2,773      788     6.93      6.96      4.53      4.51      6.01    (11)
  Emerging Markets            9/25/92   1/02/96     870,673    7,458    10.66     10.67     11.62     11.61      8.86    (3)
                                                                                                                12.44    (12)
  European Equity             4/02/93   1/02/96     139,939    3,867    15.16     15.13    - 3.75    - 3.88    - 2.11    (4)
  European Real Estate       10/01/97  10/01/97      19,451    2,061     9.44      9.46    - 1.46    - 1.56      1.07    (13)
  Global Equity               7/15/92   1/02/96     194,696   18,906    19.91     19.80    - 4.00    - 4.02      3.57    (5)
  International Equity        8/04/89   1/02/96   3,723,601   22,722    18.48     18.44      1.26      1.21      1.39    (1)
  International Magnum        3/15/96   3/15/96     194,308   24,830    11.55     11.51    - 0.17    - 0.26      1.39    (1)
  International Small Cap    12/15/92        --     249,984       --    15.52        --      1.77        --      2.78    (14)
  Japanese Equity             4/25/94   1/02/96      51,817    1,364     6.90      6.84     11.83     11.58     12.18    (6)
  Latin American              1/18/95   1/02/96      18,723    1,273     7.89      7.93     17.06     16.96     15.69    (7)
U.S. EQUITY PORTFOLIOS:
  Aggressive Equity           3/08/95   1/02/96     108,462   17,715    19.79     19.67     13.09     13.05      4.98    (9)
                                                                                                                 4.80    (15)
  Emerging Growth            11/01/89   1/02/96      35,495    1,269     8.84      8.69      9.54      9.58    - 5.42    (10)
  Equity Growth               4/02/91   1/02/96     801,163  133,505    20.44     20.35      7.35      7.22      4.98    (9)
  Technology                  9/16/96   9/16/96      27,886    1,161    21.26     21.17     18.24     18.14      4.98    (9)
  U.S. Equity Plus            7/31/97   7/31/97      24,076    1,333    12.94     12.93      4.10      4.11      4.98    (9)
  U.S. Real Estate            2/24/95   1/02/96     272,247   12,256    12.35     12.30    - 2.83    - 2.92    - 5.59    (16)
  Value Equity                1/31/90   1/02/96      46,596      934    11.25     11.22      4.36      4.37      4.98    (9)
FIXED INCOME PORTFOLIOS:
  Emerging Markets Debt       2/01/94   1/02/96      56,041      949     2.73      2.76      4.60      3.76      5.06    (17)
  Fixed Income                5/15/91   1/02/96     203,849    2,958    10.89     10.91    - 0.82    - 0.84    - 0.50    (8)
  Global Fixed Income         5/01/91   1/02/96      42,254      346    12.02     11.98    - 3.92    - 3.93    - 3.90    (18)
  High Yield                  9/28/92   1/02/96     146,249   40,088    10.90     10.87      2.92      2.79      1.64    (19)
  Municipal Bond              1/18/95        --      31,209       --    10.36        --      0.29        --      0.85    (20)
</TABLE>

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<TABLE>
<CAPTION>
   YIELD INFORMATION AS OF MARCH 31, 1999
- --------------------------------------------
                                30 DAY
                            CURRENT YIELD+
                           -----------------
                           CLASS A   CLASS B
                           -------   -------
<S>                        <C>       <C>
FIXED INCOME PORTFOLIOS:
  Emerging Markets Debt     14.69%    15.12%
  Fixed Income               5.73%     5.58%
  Global Fixed Income        4.02%     3.87%
  High Yield                 9.84%     9.59%
  Municipal Bond             4.10%       --
</TABLE>

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 +The current 30 day yield reflects the net investment income generated by the
  Portfolio over a specified 30 day period expressed as an annual percentage.
  Expenses accrued for the 30 day period include any fees charged to all
  shareholders. Yields will fluctuate as market conditions change and are not
  necessarily indicative of future performance.

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                                       2
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<TABLE>
<CAPTION>
                                          AVERAGE ANNUAL FIVE                        AVERAGE ANNUAL TOTAL
        ONE YEAR TOTAL RETURN              YEAR TOTAL RETURN                        RETURN SINCE INCEPTION
- -------------------------------------  --------------------------  --------------------------------------------------------
                        COMPARABLE                  COMPARABLE                   COMPARABLE                   COMPARABLE
CLASS A    CLASS B        INDICES      CLASS A        INDICES      CLASS A     INDICES-CLASS A   CLASS B    INDICES-CLASS B
- --------   --------   ---------------  --------   ---------------  --------   -----------------  --------   ---------------
<C>        <C>        <C>        <S>   <C>        <C>        <C>   <C>        <C>           <C>  <C>        <C>        <C>
   5.05%      4.98%      6.06%   (1)     10.18%      8.75%   (1)     10.07%         9.48    (1)    11.82%      8.74%   (1)
 - 9.89    - 10.36    - 10.94    (2)   - 11.18     - 8.46    (2)      2.14          2.89    (2)  - 20.39    - 15.58    (2)
 - 9.09     - 8.71     - 5.15    (11)       --         --          - 18.37       - 26.64    (11) - 18.68    - 26.64    (11)
 - 23.05   - 23.23    - 20.06    (3)    - 5.30     - 5.42    (3)      5.12          3.88    (3)   - 2.89     - 7.32    (3)
                      - 20.95    (12)              - 5.34    (12)                   4.88    (12)             - 7.73    (12)
 - 12.11   - 12.44       4.58    (4)     11.44      18.96    (4)     15.74         18.90    (4)    12.69      21.37    (4)
 - 11.23   - 11.37    - 11.02    (13)       --         --           - 1.11          0.46    (13)  - 1.30       0.46    (13)
 - 5.41     - 5.67      12.64    (5)     14.78      16.36    (5)     17.69         15.27    (5)    16.68      17.44    (5)
   2.83       2.66       6.06    (1)     13.82       8.75    (1)     12.62          5.46    (1)    15.82       8.74    (1)
 - 6.23     - 6.51       6.06    (1)        --         --             7.21          9.48    (1)     6.92       9.48    (1)
 - 7.11         --     - 8.42    (14)     3.48     - 4.79    (14)    11.21          2.77    (14)      --         --
  18.08      17.48      15.49    (6)        --         --             0.60        - 4.91    (6)     2.23     - 7.89    (6)
 - 29.03   - 28.78    - 25.27    (7)        --         --             8.58          2.42    (7)    12.77       5.07    (7)
  10.37      10.08      18.45               --         --            35.71         29.74    (9)    31.27      18.38    (9)
                        11.50    (15)                  --                          21.35    (15)              27.45    (15)
  20.11      19.72    - 16.26    (10)    17.43      11.22    (10)    14.22         11.42    (10)   15.59       8.69    (10)
   9.44       9.20      18.45    (9)     27.25      26.24    (9)     19.48         19.21    (9)    26.95      27.45    (9)
  57.07      56.63      18.45    (9)        --         --            47.39         30.42    (9)    47.03      29.88    (9)
  12.58      12.30      18.45    (9)        --         --            17.71         21.47    (9)    17.53      21.47    (9)
 - 13.71   - 13.95    - 21.75               --         --            16.00          9.63    (16)   13.16       7.57    (16)
   0.09     - 0.14      18.45    (9)     19.06      26.24    (9)     14.31         19.08    (9)    18.36      27.45    (9)
 - 36.53   - 36.46    - 14.47    (17)    10.35      13.06    (17)     5.43          7.62    (17)    5.12      10.94    (17)
   5.42       5.35       6.49    (8)      7.82       7.79    (8)      8.06          8.19    (8)     6.37       6.56    (8)
   7.92       7.67       9.73    (18)     6.44       7.36    (18)     7.43          8.55    (18)    5.04       5.05    (18)
   1.73       1.48     - 0.75    (19)    10.96       8.74    (19)    11.75          9.62    (19)   10.82       8.24    (19)
   4.87         --       5.92    (20)       --         --             6.06          7.39    (20)      --         --
</TABLE>

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     INDICES:

 (1)  MSCI EAFE (Europe, Australasia, and Far East)
 (2)  MSCI All-Country Far East Free ex-Japan
 (3)  IFC Global Total Return Composite
 (4)  MSCI Europe
 (5)  MSCI World
 (6)  MSCI Japan
 (7)  MSCI Emerging Markets Global Latin America
 (8)  Lehman Aggregate Bond
 (9)  S&P 500
(10)  Russell 2000
(11)  GPR General Real Estate Securities Index -- Far East
(12)  MSCI Emerging Markets Free
(13)  GPR General Real Estate Securities Index -- Europe
(14)  MSCI EAFE Small Cap
(15)  Lipper Capital Appreciation
(16)  National Association of Real Estate Investment Trusts
      (NAREIT) Equity
(17)  J.P. Morgan Emerging Markets Bond Plus
(18)  J.P. Morgan Traded Global Bond
(19)  CS First Boston High Yield
(20)  Lehman 7-Year Municipal Bond

Past performance should not be construed as a guarantee of future performance.
Investment return and principal value will fluctuate so that an investor's
shares, when redeemed, may be worth more or less than their original cost.
Please read the Portfolios' prospectuses carefully before you invest or send
money.

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                                       3
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
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LETTER TO SHAREHOLDERS
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ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO

The Active International Allocation Portfolio invests in international equity
markets, with emphasis placed upon countries and sectors, rather than stock
selection. This approach reflects our belief that a diversified selection of
securities representing exposure to countries that we find attractive provides
an effective way to maximize the return potential and minimize the risk
associated with global investing.

For the three months ended March 31, 1999, the Portfolio had a total return of
1.18% for the Class A shares and 0.58% for the Class B shares compared to 1.39%
for the Morgan Stanley Capital International (MSCI) EAFE (the "Index"). For the
one year period ended March 31, 1999, the Portfolio had a total return of 5.05%
for the Class A shares and 4.98% for the Class B shares compared to 6.06% for
the Index. For the five-year period ended March 31, 1999, the average annual
total return for Class A shares was 10.18% compared to 8.75% for the Index. From
inception on January 17, 1992 through March 31, 1999, the average annual total
return for Class A shares was 10.07% compared to 9.48% for the Index. From
inception on January 2, 1996 to March 31, 1999, the average annual total return
for Class B shares was 11.82% compared to 8.74% for the Index.

PERFORMANCE COMPARED TO MORGAN STANLEY CAPITAL
INTERNATIONAL (MSCI) EAFE INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                                       TOTAL RETURNS(2)
                                            ---------------------------------------
                                                                           AVERAGE
                                                              AVERAGE      ANNUAL
                                                      ONE      ANNUAL       SINCE
                                             YTD     YEAR    FIVE YEARS   INCEPTION
                                            ------   -----   ----------   ---------
<S>                                         <C>      <C>     <C>          <C>
PORTFOLIO -- CLASS A......................   1.18%   5.05%     10.18%      10.07%
PORTFOLIO -- CLASS B......................   0.58    4.98       N/A        11.82
INDEX -- CLASS A..........................   1.39    6.06       8.75        9.48
INDEX -- CLASS B..........................   1.39    6.06       N/A         8.74
</TABLE>

1. The MSCI EAFE Index is an unmanaged index of common stocks in Europe,
   Australasia and the Far East (includes dividends net of withholding taxes).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED ARE AS MEASURED BY THE MSCI EAFE INDEX AND ARE FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF THE
PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK
CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

Our first quarter performance was mediocre both compared to the Index and the
average international manager. We are defensively postured because most global
markets are priced for perfection and there are disconcerting pockets of
speculative mania. However although we can think of many things that could go
wrong, none have as yet, so there is no catalyst, other than price, for a bear
market.

For the time being, the U.S. economy is enjoying the best of all possible worlds
with strong growth and virtually no inflation. The rest of the world is not as
robust however, with Japan still in recession, Europe languishing, and the
developing world generally suffering. Our contacts with analysts and corporate
managers in Europe and in Asia continue to suggest a general loss of pricing
power and pressure on margins. Thus, we continue to worry that profit forecasts
(still almost 12% in Europe) for 1999 may disappoint.

However, since we are mindful of our mandate to be an EAFE portfolio and
respectful of the momentum of markets and the power of the bulls, we have not
taken an extreme negative position, although we have held 5-10% cash throughout
most of the quarter. We have also remained relatively close to the EAFE country
benchmarks. If pressed we would have to admit that we believe that both U.S. and
European equities are at the top of their trading ranges and the next move in
most of the developed equity markets, with the possible exception of Japan, is
down and not up.

Currently, we are about 5% underweight the Index in Europe, some 3% over in the
U.K. including a small and medium capitalization tilt, and about Index weight in
Asia and Japan. Relative to the Index, our biggest overweight is Singapore, and
we still emphasize the "Euro-Bubble" economies of Spain, Italy, and Portugal.
Our target cash position is 5%. We hold our tilt into European real estate and
have been extensively analyzing other tilts, particularly out of European
telecommunications and into value cyclical groups such as chemicals and papers.

Early in the quarter we visited Singapore, Hong Kong, and Japan and talked with
government officials, central bankers, other investors, and businessmen. These
meetings were illuminating in reinforcing our conviction that Asia is not yet
out of the economic woods; however we were impressed with the fervor for
restructuring and belt tightening we

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Active International Allocation Portfolio

                                       4
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO (CONT.)
found in Singapore. We are admirers of the Hong Kong Monetary Authority, but the
austerity the peg imposes on the economy makes it difficult for equities to
prosper.

Our time in Japan was particularly interesting. Japanese equities are not cheap
on earnings and dividends, but on price to sales and enterprise value they are
the cheapest in the industrial world. Profitability both in terms of return on
equity and operating margins has collapsed, and as a result earnings are as
depressed as profits were in the U.S. in the 1930's. We are pretty much
convinced that the Japanese government and corporate management are now
committed to radical restructuring.

This should be the recipe for a long lasting recovery in both profitability and
stock prices. It has been calculated that if Japanese companies over the next
ten years restructure so as to bring their returns to 75% of the level of
European companies today, their profits will go at an annual rate of 16%.

Unfortunately, the Japanese economy is suffering from both recession and
deflation, and corporate restructuring in the short run only increases the pain.
There are no real signs yet that the economy has begun to recover, and our
economists in Japan are quite pessimistic. It is hard to see a new bull market
beginning in Japan without some signs of life from the economy.

As a result of all this, we have moved to about an Index weight in Japanese
equities. If we believed an economic spring was imminent we would increase our
weighting substantially. In the meantime, since a weaker yen is essential for
economic revival, we have hedged a portion of our Japanese yen position.

Ann D. Thivierge
PORTFOLIO MANAGER

Barton M. Biggs
PORTFOLIO MANAGER

April 1999

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                                       Active International Allocation Portfolio

                                       5
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
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INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                       VALUE
    SHARES                                                             (000)
<C>               <S>                                                <C>
- -------------------------------------------------------------------------------

COMMON STOCKS (75.6%)
  AUSTRALIA (3.3%)
        71,278    AMP Ltd..........................................  $      781
        49,476    Amcor Ltd........................................         248
        28,260    Australian Gas Light Co., Ltd....................         202
        83,395    Boral Ltd........................................         121
        16,621    Brambles Industries Ltd..........................         423
       121,212    Broken Hill Proprietary Co., Ltd.................       1,034
         8,069    CSL Ltd..........................................          67
        77,723    CSR Ltd..........................................         169
        71,400    Coca-Cola Amatil Ltd.............................         310
        83,083    Coles Myer Ltd...................................         451
         9,325    F.H. Faulding & Co., Ltd.........................          56
       134,451    Fosters Brewing Group Ltd........................         396
       100,833    General Property Trust...........................         177
        50,111    Gio Australia Holdings Ltd.......................         144
        89,885    Goodman Fielder Ltd..............................          93
        22,003    ICI Australia Ltd................................         116
        20,774    Leighton Holdings Ltd............................          69
        40,185    Lend Lease Corp., Ltd............................         512
        27,141    Mayne Nickless Ltd...............................          90
       100,499    National Australia Bank Ltd......................       1,827
       142,572    News Corp., Ltd..................................       1,056
       147,069    Normandy Mining Ltd..............................         118
        51,580    North Ltd........................................          82
        81,600    Pacific Dunlop Ltd...............................         142
        70,223    Pioneer International Ltd........................         139
        30,307    QBE Insurance Group Ltd..........................         126
        13,815    Rio Tinto Ltd....................................         193
        45,866    Santos Ltd.......................................         133
        29,834    Schroders Property Fund..........................          46
        15,020    Smith (Howard) Ltd...............................         117
        47,729    Southcorp Holdings Ltd...........................         194
        23,904    Stockland Trust Group............................          58
        24,364    Suncorp-Metway Ltd...............................         148
        24,775    TABCORP Holdings Ltd.............................         189
       367,092    Telstra Corp., Ltd...............................       1,923
       136,902    WMC Ltd..........................................         436
        14,151    Wesfarmers Ltd...................................         133
        97,523    Westfield Trust..................................         210
       138,048    Westpac Banking Corp.............................       1,007
        86,290    Woolworths Ltd...................................         276
                                                                     ----------
                                                                         14,012
                                                                     ----------
  AUSTRIA (0.3%)
         1,191    Austian Airlines/Oest Luftv AG...................          39
           159    Austria Mikro Systeme International AG...........           6
         1,170    Austria Tabakwerke AG............................          79
           486    BBag Oest Brau Beteiligungs AG...................          22
            90    BWT AG...........................................          18
         5,990    Bank Austria AG..................................         357
           250    Bau Holding AG...................................           8
           587    Boehler-Uddeholm AG..............................          28
           375    EA-Generali AG...................................          79
         1,127    Flughafen Wein AG................................          48
           197    Lenzing AG.......................................          12

<CAPTION>

                                                                       VALUE
    SHARES                                                             (000)
<C>               <S>                                                <C>
- -------------------------------------------------------------------------------

           637    Mayr-Melnhof Karton AG...........................  $       28
         1,420    OMV AG...........................................         126
         1,621    Oest Elektrizatswirts AG, Class A................         259
           743    Radex-Heraklith Industriebet AG..................          20
           795    VA Technologie AG................................          57
           458    Wienerberger Baustoffindustrie AG................          81
                                                                     ----------
                                                                          1,267
                                                                     ----------
  FRANCE (5.3%)
         1,158    Accor............................................         288
         5,896    Alcatel Alsthom..................................         679
        10,098    Axa..............................................       1,341
           406    Bail Investissement..............................          54
         6,301    Banque Nationale de Paris........................         549
           855    Bouygues.........................................         238
           943    Canal Plus.......................................         277
         2,227    Cap Gemini Sogeti................................         374
         1,174    Carrefour........................................         906
         2,339    Casino Guichard-Perrachon........................         208
         3,045    Cie de Saint Gobain..............................         484
         4,817    Cie Generale des Eaux............................       1,187
         5,399    Compangnie Financiere de Paribas.................         604
         3,523    Dassault Systemes SA.............................         131
         8,515    Elf Aquitaine....................................       1,158
         1,319    Eridania Beghin-Say..............................         196
           411    Essilor International............................         137
        30,452    France Telecom...................................       2,466
         1,924    Groupe Danone....................................         485
         2,748    Klepierre........................................         254
         2,011    L'OREAL..........................................       1,274
         2,805    L'Air Liquide....................................         419
         2,695    LVMH Moet Hennessy Louis Vuitton.................         669
         3,337    Lafarge..........................................         301
         4,372    Lagardere S.C.A..................................         142
           875    Legrand..........................................         184
         4,368    Lyonnaise des Eaux...............................         810
         6,574    Michelin Compagnie Generale des Establissements,
                    Class B........................................         295
         1,605    PSA Peugeot Citroen..............................         231
         2,742    Pechiney.........................................          99
         2,170    Pernod Ricard....................................         138
         3,612    Pinault-Printemps - Re doute.....................         577
           578    Promodes.........................................         354
        11,457    Rhone-Poulenc, Class A...........................         519
            88    Sagem............................................          49
         3,311    Sanofi...........................................         559
         5,294    Schneider........................................         293
         2,040    SEITA............................................         139
           968    Silic............................................         162
         3,827    Simco (RFD)......................................         335
         1,880    Soceite BIC......................................          99
           900    Societe Fonciere Lyonnaise.......................         120
         2,948    Societe Generale, Class A........................         568
         1,052    Sodexho Alliance.................................         172
           795    Sophia...........................................          30
         5,074    Thomson CSF......................................         155
         7,925    Total, Class B...................................         978
</TABLE>

- --------------------------------------------------------------------------------
Active International Allocation Portfolio

                                       6
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       VALUE
    SHARES                                                             (000)
- -------------------------------------------------------------------------------
<C>               <S>                                                <C>
</TABLE>

  FRANCE (CONT.)
<TABLE>
<C>               <S>                                                <C>
         3,507    Unibail..........................................  $      440
         8,809    Usinor Sacilor...................................         116
         2,735    Valeo............................................         214
                                                                     ----------
                                                                         22,457
                                                                     ----------
  GERMANY (6.0%)
         1,883    AGIV AG..........................................          35
         1,883    Adidas AG........................................         167
         9,958    Allianz AG.......................................       3,033
         1,350    AMB AG...........................................         160
        23,950    BASF AG..........................................         873
        27,800    Bayer AG.........................................       1,036
        15,670    Bayerische Vereinsbank AG........................         942
         2,567    Bilfinger & Berger Bau AG........................          49
         1,367    CKAG AG..........................................         136
         4,567    Continential AG..................................         114
        35,834    DaimlerChrysler AG...............................       3,123
        19,550    Deutsche Bank AG.................................       1,021
        83,989    Deutsche Telekom AG..............................       3,383
        18,717    Dresdner Bank AG.................................         749
         5,867    FAG Kugelfischer Georg Schaefer AG...............          44
         1,985    Heidelberger Zement AG...........................         121
         4,133    Hochtief AG......................................         136
           483    Karstadt AG......................................         173
         2,683    Kloeckner-Humboldt-Deutz AG......................          18
           333    Linde AG.........................................         190
        14,033    Lufthansa AG.....................................         310
        13,900    Mannesmann AG....................................       1,727
         8,417    Merck KGaA.......................................         288
         9,143    Metro AG.........................................         581
         5,607    Muechener Rueck AG (Registered)..................       1,120
           650    Preussag AG......................................         340
        16,823    RWE AG...........................................         755
         2,367    SAP AG...........................................         682
         3,017    Schering AG......................................         344
        21,583    Siemens AG.......................................       1,419
        19,200    VEBA AG..........................................       1,012
         1,123    Viag AG..........................................         616
        11,580    Volkswagen AG....................................         771
                                                                     ----------
                                                                         25,468
                                                                     ----------
  HONG KONG (1.8%)
        72,800    Bank of East Asia Ltd............................         124
       148,000    Cathay Pacific Airways Ltd.......................         170
       105,000    Cheung Kong Holdings Ltd.........................         799
       120,000    CLP Holdings Ltd.................................         576
        75,000    Hang Lung Development Co.........................          91
        88,500    Hang Seng Bank Ltd...............................         814
       226,000    Hong Kong & China Gas Co., Ltd...................         319
        65,500    Hong Kong & Shanghai Hotel Ltd...................          50
       577,682    Hong Kong Telecommunications Ltd.................       1,140
        65,200    Hopewell Holdings Ltd............................          32
       180,000    Hutchison Whampoa Ltd............................       1,417
        53,000    Hysan Development Co., Ltd.......................          69
       107,333    New World Development Co., Ltd...................         211
       296,000    Regal Hotel International Ltd....................          29
<CAPTION>

                                                                       VALUE
    SHARES                                                             (000)
<C>               <S>                                                <C>
- -------------------------------------------------------------------------------
         7,000    Shangri-La Asia Ltd..............................  $        7
       190,393    Sino Land Co.....................................         100
       118,000    South China Morning Post Holdings Ltd............          65
       115,000    Sun Hung Kai Properties Ltd......................         861
        77,000    Swire Pacific Ltd., Class A......................         358
        20,000    Television Broadcasts Ltd........................          73
       121,000    Wharf Holdings Ltd...............................         186
                                                                     ----------
                                                                          7,491
                                                                     ----------
  ITALY (4.5%)
        68,197    ALITALIA.........................................         232
        50,062    Assicurazioni Generali S.p.A.....................       2,008
        94,637    Banca Commerciale Italiana.......................         778
       129,773    Banco Ambrosiano Veneto S.p.A....................         766
        17,711    Banco Popolare di Milano.........................         165
        85,671    Benetton Group S.p.A.............................         154
         4,338    Cartiere Burgo...................................          31
       215,113    Credito Italiano S.p.A...........................       1,163
       403,248    ENI S.p.A........................................       2,573
        34,066    Edison S.p.A.....................................         314
       272,703    Fiat S.p.A.......................................         796
        49,981    Fiat S.p.A. Di Risp (NCS)........................          90
         8,170    Immobiliaria Urbis...............................           8
        21,020    Impregilo S.p.A..................................          16
        69,204    Instituto Bancario San Paolo di Torino...........       1,126
       200,856    Istituto Nazionale delle Assicurazioni...........         608
         7,770    Italcementi S.p.A................................          86
        11,315    Italcementi S.p.A. (RNC).........................          56
        24,068    Italgas..........................................         117
        23,899    Magneti Marelli S.p.A............................          35
        59,569    Mediaset S.p.A...................................         561
        32,900    Mediobanca S.p.A.................................         443
       199,337    Montedison S.p.A.................................         207
        65,897    Montedison S.p.A. Di Risp (NCS)..................          53
       145,540    Olivetti S.p.A...................................         457
        88,086    Parmalat Finanziaria S.p.A.......................         126
       112,197    Pirelli S.p.A....................................         320
        24,625    R.A.S. S.p.A.....................................         258
         6,039    Reno de Medici S.p.A.............................          15
        10,825    Rinascente S.p.A.................................          85
         6,942    SAI..............................................          89
         9,171    Sirti S.p.A......................................          55
        45,711    Snia BPD S.p.A...................................          62
       182,208    Telecom Italia S.p.A.............................       1,939
        48,316    Telecom Italia S.p.A. (RNC)......................         287
       323,205    Telecom Italia Mobile S.p.A......................       2,177
        78,811    Telecom Italia Mobile S.p.A. (RNC)...............         305
       566,695    Unione Immobiliare S.p.A.........................         297
                                                                     ----------
                                                                         18,858
                                                                     ----------
  JAPAN (18.7%)
        16,000    77 Bank Ltd......................................         155
         6,700    Acom Co., Ltd....................................         474
        63,400    Ajinomoto Co., Inc...............................         755
        58,600    Aoki Corp........................................          38
        97,900    Asahi Bank Ltd...................................         517
        32,000    Asahi Breweries Ltd..............................         419
</TABLE>

- --------------------------------------------------------------------------------
                                       Active International Allocation Portfolio

                                       7
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       VALUE
    SHARES                                                             (000)
- -------------------------------------------------------------------------------
<C>               <S>                                                <C>
</TABLE>

  JAPAN (CONT.)
<TABLE>
<C>               <S>                                                <C>
       129,000    Asahi Chemical Industry Co., Ltd.................  $      755
        85,800    Asahi Glass Co., Ltd.............................         623
       218,000    Bank of Tokyo-Mitsubishi Ltd.....................       3,005
        36,800    Bank of Yokohama Ltd.............................          93
        48,000    Bridgestone Corp.................................       1,224
        42,600    Canon, Inc.......................................       1,054
        24,800    Casio Computer Co., Ltd..........................         168
        29,400    Chiba Bank Ltd...................................         129
        24,600    Chugai Pharmaceuticals Co., Ltd..................         284
         7,600    Credit Saison Co., Ltd...........................         167
        40,600    Dai Nippon Printing Co., Ltd.....................         617
        36,600    Daiei, Inc.......................................         105
        43,600    Daikin Industries Ltd............................         432
        43,600    Daiwa House Industry Co., Ltd....................         498
        98,000    Daiwa Securities Co., Ltd........................         526
        14,600    Denso Corp.......................................         287
           288    East Japan Railway Co............................       1,712
        28,800    Ebara Corp.......................................         318
         9,700    Fanuc Ltd........................................         397
       250,000    Fuji Bank........................................       1,480
        28,000    Fuji Photo Film Ltd..............................       1,059
       107,200    Fujitsu Ltd......................................       1,722
        31,800    Furukawa Electric Co., Ltd.......................         132
        16,000    Gunma Bank Ltd...................................         126
        23,000    Hankyu Corp......................................         100
        43,000    Hazama Corp......................................          35
       208,000    Hitachi Ltd......................................       1,541
        45,000    Honda Motor Co., Ltd.............................       2,033
       121,000    Industrial Bank of Japan.........................         818
        21,000    Ito-Yokado Co., Ltd..............................       1,351
       137,000    Japan Airlines Co., Ltd..........................         448
       102,000    Japan Energy Corp................................         115
        17,600    Joyo Bank Ltd....................................          75
        21,800    Jusco Co., Ltd...................................         379
        84,400    Kajima Corp......................................         257
        55,600    Kansai Electric Power Co., Ltd...................       1,125
        29,000    Kao Corp.........................................         641
        68,400    Kawasaki Steel Corp..............................         116
        67,200    Kinki Nippon Railway Co., Ltd....................         360
        88,400    Kirin Brewery Co., Ltd...........................       1,036
        70,400    Komatsu Ltd......................................         362
       124,000    Kubota Corp......................................         330
       136,400    Kumagai Gumi Co., Ltd............................         120
        11,400    Kyocera Corp.....................................         614
        39,600    Kyowa Hakko Kogyo Co., Ltd.......................         208
        70,000    Marubeni Corp....................................         133
         8,800    Marui Co., Ltd...................................         150
        97,000    Matsushita Electric Industrial Co., Ltd..........       1,892
       131,000    Mitsubishi Chemical Corp.........................         372
        89,000    Mitsubishi Corp..................................         583
       147,800    Mitsubishi Electric Corp.........................         494
        38,000    Mitsubishi Estate Co., Ltd.......................         387
       192,000    Mitsubishi Heavy Industries Ltd..................         868
        82,400    Mitsubishi Materials Corp........................         177
        60,000    Mitsubishi Trust & Banking Co....................         622
       120,800    Mitsui & Co., Ltd................................         817
<CAPTION>

                                                                       VALUE
    SHARES                                                             (000)
<C>               <S>                                                <C>
- -------------------------------------------------------------------------------
        86,400    Mitsui Engineering & Shipbuilding Co., Ltd.......  $       80
        29,400    Mitsui Fudosan Co., Ltd..........................         265
           200    Mitsui Trust & Banking Co., Ltd..................
        44,800    Mitsukoshi Ltd...................................         125
        21,000    Murata Manufacturing Co., Ltd....................       1,117
        28,800    Mycal Corp.......................................         178
        75,400    NEC Corp.........................................         907
        45,600    NGK Insulators Ltd...............................         515
       256,800    NKK Corp.........................................         163
        32,800    Nippon Express Co., Ltd..........................         194
        31,600    Nippon Fire & Marine Insurance Co., Ltd..........         100
        39,800    Nippon Light Metal Co., Ltd......................          44
        15,600    Nippon Meat Packers, Inc.........................         220
       126,800    Nippon Oil Co., Ltd..............................         496
       487,000    Nippon Steel Co..................................         999
           614    Nippon Telegraph & Telephone Corp................       6,015
       123,000    Nippon Yusen Kabushiki Kaisha....................         488
       151,600    Nissan Motor Co., Ltd............................         589
        84,000    Nomura Securities Co., Ltd.......................         880
        47,600    Odakyu Electric Railway Corp.....................         178
        88,400    Oji Paper Co., Ltd. (New)........................         471
         1,800    Orix Corp........................................         135
       174,600    Osaka Gas Co., Ltd...............................         602
        39,600    Penta-Ocean Construction Co., Ltd................          75
        11,000    Pioneer Electric Corp............................         204
         5,000    Rohm Co., Ltd....................................         598
         3,200    SMC..............................................         286
       165,000    Sakura Bank Ltd..................................         500
        24,800    Sankyo Co., Ltd..................................         532
        30,000    Sanwa Bank Ltd...................................         326
       114,000    Sanyo Electric Co., Ltd..........................         400
         7,800    Secom Co., Ltd...................................         739
         8,700    Sega Enterprises Ltd.............................         158
        42,600    Sekisui House Co., Ltd...........................         453
        70,200    Sharp Corp.......................................         741
        10,800    Shimano, Inc.....................................         263
        61,600    Shimizu Corp.....................................         250
        16,000    Shin-Etsu Chemical Co., Ltd......................         420
        20,000    Shiseido Co., Ltd................................         277
        22,600    Shizuoka Bank Ltd................................         273
        83,400    Showa Denko......................................          86
        18,900    Sony Corp........................................       1,748
       106,000    Sumitomo Bank....................................       1,435
       165,600    Sumitomo Chemical Co., Ltd.......................         667
        83,400    Sumitomo Corp....................................         547
        59,400    Sumitomo Electric Industries.....................         704
         8,800    Sumitomo Forestry Co., Ltd.......................          61
        42,800    Sumitomo Metal & Mining Co.......................         183
       156,800    Sumitomo Metal Industries........................         189
        42,600    Sumitomo Osaka Cement Co., Ltd...................          96
        88,400    Taisei Corp., Ltd................................         208
        24,800    Taisho Pharmaceutical Co., Ltd...................         775
        28,000    Taiyo Yuden Co., Ltd.............................         363
        48,600    Takeda Chemical Industries.......................       1,884
        82,400    Teijin Ltd.......................................         333
</TABLE>

- --------------------------------------------------------------------------------
Active International Allocation Portfolio

                                       8
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       VALUE
    SHARES                                                             (000)
- -------------------------------------------------------------------------------
<C>               <S>                                                <C>
</TABLE>

  JAPAN (CONT.)
<TABLE>
<C>               <S>                                                <C>
        58,400    Tobu Railway Co., Ltd............................  $      172
        14,200    Tohoku Electric Power Co., Ltd...................         216
        81,800    Tokai Bank Ltd...................................         528
        76,000    Tokio Marine & Fire Insurance Co., Ltd...........         867
        71,900    Tokyo Electric Power Co..........................       1,548
         7,000    Tokyo Electron Ltd...............................         362
        82,600    Tokyo Gas Co.....................................         202
        68,400    Tokyu Corp.......................................         179
        31,600    Toppan Printing Co., Ltd.........................         414
       115,100    Toray Industries, Inc............................         598
        43,600    Toto Ltd.........................................         324
        66,400    Toyoba Co........................................          92
       178,000    Toyota Motor Corp................................       5,156
        83,400    Ube Industries Ltd...............................         161
           600    Yamaichi Securities Co., Ltd.....................          --
         1,000    Yasuda Trust & Banking Co........................           1
        41,000    Yokogawa Electric Corp...........................         202
                                                                     ----------
                                                                         79,387
                                                                     ----------
  NETHERLANDS (6.0%)
        82,240    ABN Amro Holding N.V.............................       1,716
        31,951    Aegon N.V........................................       2,921
        19,132    Akzo Nobel N.V...................................         710
         5,089    Buhrmann N.V.....................................          89
        34,516    Elsevier N.V.....................................         515
         4,948    Getronics N.V....................................         183
         4,734    Hagemeyer N.V....................................         146
        17,824    Heineken N.V.....................................         900
        52,880    ING Groep N.V....................................       2,919
         4,854    KLM Royal Dutch Airlines N.V.....................         136
        33,530    Koninklijke Ahold N.V............................       1,287
         1,479    Nedlloyd Groep N.V...............................          34
         5,209    Oce N.V..........................................         130
        20,512    Philips Electronics N.V..........................       1,674
         6,034    Rodamco N.V......................................         140
       123,467    Royal Dutch Petroleum Co.........................       6,575
        25,688    Royal KPN N.V....................................       1,024
         2,698    Stork N.V........................................          53
        27,863    TNT Post Group N.V...............................         841
        37,485    Unilever N.V.....................................       2,608
         4,142    Vedior N.V.......................................          96
         4,160    Wolters Kluwer N.V...............................         756
                                                                     ----------
                                                                         25,453
                                                                     ----------
  PORTUGAL (1.1%)
        20,709    Banco Commercial Portugues (Registered)..........         627
        12,702    Banco Espirito Santo e Comercial de Lisboa
                    (Registered)...................................         343
         8,408    Banco Portugues de Investimento (New)............         256
         6,261    Brisa-Auto Estradas..............................         290
         2,326    Cia de Seguros Tranquilidade, (Registered).......          66
         9,482    Cimpor SGPS......................................         266
           400    Cin-Corparacao Industial do Norte................          11
        63,151    EDP-Electricidade de Portugal....................       1,248
<CAPTION>

                                                                       VALUE
    SHARES                                                             (000)
<C>               <S>                                                <C>
- -------------------------------------------------------------------------------
           537    INAPA-Investimentos Participacoes e Gestao.......  $        5
         8,498    Jeronimo Martins SGPS............................         303
        19,858    Portugal Telecom (Registered)....................         891
        11,271    Portucel Industrial-Empressa.....................          62
           358    Sociedade de Construcoes Soares da Costa.........           1
         3,032    Somague-Sociedade Gestora de Participacoes.......          13
         4,830    Sonae Investmentos...............................         188
         1,789    UNICER-Uniao Cervejeira..........................          38
                                                                     ----------
                                                                          4,608
                                                                     ----------
  SINGAPORE (1.5%)
        32,000    Asia Food & Properties Ltd.......................           6
        92,000    City Developments Ltd............................         479
        66,000    Comfort Group Ltd................................          20
        11,350    Creative Technology Ltd..........................         132
        29,000    Cycle & Carriage Ltd.............................         123
       127,000    DBS Land Ltd.....................................         188
        46,000    Development Bank of Singapore Ltd. (Foreign).....         349
        31,000    First Capital Corp., Ltd.........................          30
        33,800    Fraser & Neave Ltd...............................         120
        47,000    Hotel Properties Ltd.............................          22
       105,750    Keppel Corp., Ltd................................         285
        44,000    NatSteel Ltd.....................................          46
       130,560    Oversea-Chinese Banking Corp. (Foreign)..........         885
        21,226    Overseas Union Enterprise Ltd....................          37
        44,000    Parkway Holdings Ltd.............................          86
       188,644    Sembcorp Industries Ltd..........................         206
       113,000    Singapore Airlines Ltd. (Foreign)................         818
        23,018    Singapore Ltd. (Foreign).........................         255
         7,000    Singapore Press Holdings Ltd.....................          77
       335,000    Singapore Technologies Engineering Ltd...........         303
       716,000    Singapore Telecommunications Ltd.................       1,020
        22,000    Straits Trading Co., Ltd.........................          20
       147,000    United Industrial Corp., Ltd.....................          77
        87,000    United Overseas Bank Ltd. (Foreign)..............         544
        70,000    United Overseas Land Ltd.........................          47
        22,000    Venture Manufacturing (Singapore) Ltd............          99
                                                                     ----------
                                                                          6,274
                                                                     ----------
  SPAIN (4.1%)
         4,526    ACS Actividades..................................         140
         5,569    Acerinox.........................................         142
         3,519    Aguas de Barcelona...............................         212
        34,173    Argentaria.......................................         823
        19,526    Autopistas Concesionaria Espanola................         251
         2,402    Azucarera Ebro Agricolas.........................          47
       153,813    Banco Bilbao Vizcaya (Registered)................       2,295
        71,352    Banco Central Hispano Americano..................         896
        89,000    Banco Santander..................................       1,829
         1,081    Corporacion Financiera Alba......................         155
         5,430    Corporacion Mapfre...............................         108
         4,330    Dragados y Construccion..........................         142
</TABLE>

- --------------------------------------------------------------------------------
                                       Active International Allocation Portfolio

                                       9
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       VALUE
    SHARES                                                             (000)
- -------------------------------------------------------------------------------
<C>               <S>                                                <C>
</TABLE>

  SPAIN (CONT.)
<TABLE>
<C>               <S>                                                <C>
        70,435    Endesa...........................................  $    1,781
             1    Ercros...........................................          --
         3,446    Fomento Construction y Cantractas................         212
        11,003    Gas Natural SDG..................................       1,017
        66,400    Iberdrola........................................         985
        13,611    Inmobiliaria Metropolitana Vasco Central.........         319
        23,861    Repsol...........................................       1,231
         2,403    Sol Melia........................................          88
        13,205    Tabacalera.......................................         268
        76,766    Telefonica.......................................       3,261
        16,707    Telepizza........................................         128
        21,964    Union Electrica Fenosa...........................         328
            57    Uralita..........................................           1
        44,682    Vallehermoso.....................................         478
           100    Viscofan Envolturas Celulosicas..................           1
         1,808    Zardoya Otis.....................................          46
                                                                     ----------
                                                                         17,184
                                                                     ----------
  SWEDEN (1.9%)
        26,500    ABB AB, Class A..................................         329
        11,100    ABB AB, Class B..................................         138
         6,300    AGA AB, Class B..................................          79
        45,833    Astra AB, Class A................................       1,053
        11,100    Astra AB, Class B................................         252
         5,050    Atlas Copco AB, Class A..........................         137
         2,700    Atlas Copco AB, Class B..........................          72
        13,540    Castellum AB.....................................         126
        21,180    Diligentia AB....................................         168
        13,800    Drott AB, Class B................................         122
        12,200    Electrolux AB, Series B..........................         242
        75,500    Ericsson LM, Class B.............................       1,840
         4,640    Fastighets AB Tornet.............................          63
        13,800    ForeningsSparbanken AB...........................         325
         8,200    Hennes & Mauritz AB, Class B.....................         620
         4,100    Netcom Systems AB, Class B.......................         140
         2,900    OM Gruppen AB....................................          36
           980    Piren AB.........................................           6
         3,300    S.K.F. AB, Class B...............................          47
         7,900    Sandvik AB, Class A..............................         158
         3,200    Sandvik AB, Class B..............................          64
        10,640    Securitas AB, Class B............................         169
        20,400    Skandia Forsakrings AB...........................         380
        23,800    Skandinaviska Enskilda Banken, Class A...........         292
         5,000    Skanska AB, Class B..............................         171
         8,800    Svenska Cellulosa AB, Class B....................         191
         8,500    Svenska Handelsbanken, Class A...................         297
         4,800    Svenskt Stal AB (SSAB), Series A.................          60
         5,800    Trelleborg AB, Class B...........................          56
         5,800    Volvo AB, Class A................................         150
        12,050    Volvo AB, Class B................................         316
         2,900    WM-Data AB, Class B..............................         113
                                                                     ----------
                                                                          8,212
                                                                     ----------
  SWITZERLAND (6.1%)
           465    ABB AG...........................................         617
           895    Adecco...........................................         455
<CAPTION>

                                                                       VALUE
    SHARES                                                             (000)
<C>               <S>                                                <C>
- -------------------------------------------------------------------------------
           295    Alusuisse-Lonza Holdings Ltd. (Registered).......  $      325
        12,600    CS Holding AG (Registered).......................       2,355
           350    Holderbank Financiere Glarus AG, Class B
                    (Bearer).......................................         392
         1,865    Nestle (Registered)..............................       3,396
         3,020    Novartis AG (Registered).........................       4,911
            76    Roche Holding AG (Bearer)........................       1,359
           326    Roche Holding AG (Registered)....................       3,985
           750    SAirgroup (Registered)...........................         162
            80    SGS Surveillance.................................          66
           260    SMH AG (Bearer)..................................         166
           210    Sulzer AG (Registered)...........................         134
           695    Swiss Reinsurance (Registered)...................       1,542
         3,630    Swisscom AG (Registered).........................       1,421
         9,869    Union Bank of Switzerland AG (Registered)........       3,108
           315    Valora Holding AG................................          74
         2,260    Zurich Allied AG.................................       1,450
                                                                     ----------
                                                                         25,918
                                                                     ----------
  THAILAND (0.0%)
         8,000    CMIC Finance & Securities PCL (Foreign)..........          --
        18,600    General Finance & Securities PCL (Foreign).......          --
        34,700    Siam City Bank PCL (Foreign).....................          --
                                                                     ----------
                                                                             --
                                                                     ----------
  UNITED KINGDOM (15.0%)
        53,563    Abbey National plc...............................       1,102
        34,817    Albert Fisher Group plc..........................           3
         1,851    Alldays plc......................................           2
         2,415    Allders plc......................................           4
        58,643    Allied Zurich plc................................         791
         7,063    AMEC plc.........................................          26
        20,898    Anglian Water plc................................         257
        34,741    Arjo Wiggins Appleton plc........................          79
        29,624    Associated British Foods plc.....................         208
        21,152    Associated British Ports Holdings plc............          96
        43,513    BAA plc..........................................         485
        53,303    Barclays plc.....................................       1,534
        10,099    Barratt Developments plc.........................          48
        27,053    Bass plc.........................................         368
         1,209    BBA Group plc....................................           8
        25,448    Beazer Group plc.................................          78
        17,594    Berisford plc....................................          63
       154,396    BG plc...........................................         908
        35,417    BICC plc.........................................          54
        66,198    Blue Circle Industries plc.......................         381
        21,425    BOC Group plc....................................         299
        37,939    Boots Co. plc....................................         548
        68,361    BPB Industries plc...............................         298
        75,975    British Aerospace plc............................         508
        45,104    British Airways plc..............................         313
        58,654    British American Tobacco plc.....................         489
        58,492    British Land Co. plc.............................         503
</TABLE>

- --------------------------------------------------------------------------------
Active International Allocation Portfolio

                                       10
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       VALUE
    SHARES                                                             (000)
- -------------------------------------------------------------------------------
<C>               <S>                                                <C>
</TABLE>

  UNITED KINGDOM (CONT.)
<TABLE>
<C>               <S>                                                <C>
       290,608    British Petroleum Co. plc........................  $    4,958
        59,331    British Sky Broadcasting plc.....................         509
       104,121    British Steel plc................................         215
       210,400    British Telecommunications plc...................       3,436
       158,240    BTR plc..........................................         699
        34,088    Burmah Castrol plc...............................         521
        80,272    Cable & Wireless plc.............................       1,004
        42,358    Cadbury Schweppes plc............................         615
         4,621    Capital Corp. plc................................           6
        25,950    Capital Shopping Centers plc.....................         159
        85,194    Caradon plc......................................         189
        11,379    Carpetright plc..................................          66
       177,581    Centrica plc.....................................         313
         4,309    Cobham plc.......................................          64
        36,806    Commercial Union plc.............................         574
        25,488    Compass Group plc................................         295
         2,363    Delta plc........................................           6
       120,057    Diageo plc.......................................       1,350
         4,384    Dialog Corp. plc.................................           8
         5,841    EMAP plc.........................................         114
        64,737    EMI Group plc....................................         463
         4,673    Empla plc Rights.................................           5
        26,630    Enterprise Oil plc...............................         153
        25,800    Firstgroup plc...................................         170
        21,058    FKI plc..........................................          54
        96,509    General Electric plc.............................         871
        54,218    GKN plc..........................................         825
       117,363    Glaxo Wellcome plc...............................       3,930
        32,123    Granada Group plc................................         651
       117,360    Grantchester Holdings plc........................         351
        51,500    Great Portland Estates plc.......................         164
        37,062    Great Universal Stores plc.......................         404
         5,362    Greycoat plc.....................................          19
        22,063    Guardian Royal Exchange plc......................         131
        98,343    Halifax plc......................................       1,207
        51,045    Hanson plc.......................................         458
        13,575    House of Fraser..................................          17
        55,088    HSBC Holdings plc................................       1,756
        22,226    HSBC Holdings plc (75p)..........................         717
         9,035    Hyder plc........................................         114
        24,877    IMI plc..........................................         106
        29,662    Imperial Chemical Industries plc.................         265
        14,587    Jarvis plc.......................................         132
         1,427    JBA Holdings plc.................................           4
        29,407    Johnson Matthey plc..............................         221
        55,767    Kingfisher plc...................................         704
         2,469    Kwik-Fit Holdings plc............................          17
        52,578    Ladbroke Group plc...............................         241
         6,302    Laird Group plc..................................          23
        18,405    Land Securities plc..............................         244
        70,346    Lasmo plc........................................         143
        56,939    Legal & General Group plc........................         671
        11,777    Lex Service plc..................................          78
        11,340    Limit plc........................................          25
       191,131    Lloyds TSB Group plc.............................       2,893
        21,361    London Clubs International plc...................          52
<CAPTION>

                                                                       VALUE
    SHARES                                                             (000)
<C>               <S>                                                <C>
- -------------------------------------------------------------------------------
         7,019    London Forfaiting Co. plc........................  $        7
        28,645    Lonrho plc.......................................         210
         1,872    Low & Bonar plc..................................           5
       110,010    Lucascarity plc..................................         510
         1,810    Manchester United plc............................           6
       103,929    Marks and Spencer plc............................         685
        40,248    Marley plc.......................................          80
           237    Mayflower Corp. plc..............................           1
         2,171    McKechnie plc....................................          15
         5,553    Meggitt plc......................................          17
        28,326    MEPC plc.........................................         198
        21,924    Mirror Group News plc............................          74
        57,700    MISYS plc........................................         584
        50,775    National Power plc...............................         391
        16,137    NEXT plc.........................................         185
        42,137    NFC plc..........................................          94
           890    Ocean Group plc..................................          13
         9,481    Parity plc.......................................         107
        28,910    Peninsular & Oriental Steam Navigation...........         421
        11,317    Pennon Group plc.................................         174
       178,701    Pilkington plc...................................         241
         1,975    Powerscreen International plc....................           5
        78,655    Prudential Corp. plc.............................       1,026
        10,414    Racal Electronic plc.............................          67
        17,911    Railtrack Group plc..............................         411
        62,124    Rank Group plc...................................         227
        47,708    Reed International plc...........................         425
       124,404    Rentokil Initial plc.............................         772
        51,543    Reuters Group plc................................         758
        26,392    Rexam plc........................................          87
        39,391    Rio Tinto plc....................................         547
        15,240    RMC Group plc....................................         206
        37,612    Rolls-Royce plc..................................         159
        41,777    Royal & Sun Alliance Insurance Group plc.........         394
        12,052    Rugby Group plc..................................          22
        45,756    Safeway plc......................................         179
        72,318    Sainsbury (J) plc................................         448
         4,107    Schroders plc....................................          95
         5,310    Scotia Holdings plc..............................           9
           187    Scottish & Newcastle plc.........................           2
        47,576    Scottish Hydro-Electric plc......................         430
        53,424    Scottish Power plc...............................         466
         1,614    Skillsgroup plc..................................           8
        13,093    Slough Estates plc...............................          67
       193,141    Smithkline Beecham plc...........................       2,788
         5,565    Smiths Industries plc............................          81
        45,467    Stagecoach Holdings plc..........................         167
        52,065    Tarmac plc.......................................          89
        32,085    Tate & Lyle plc..................................         216
        18,917    Taylor Woodrow plc...............................          55
        81,094    Tesco plc........................................         215
        20,033    Thames Water plc.................................         304
         6,861    The Berkeley Group plc...........................          70
        19,443    TI Group plc.....................................         126
         1,574    Torotrac plc.....................................           3
       121,514    Unilever plc.....................................       1,130
</TABLE>

- --------------------------------------------------------------------------------
                                       Active International Allocation Portfolio

                                       11
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ACTIVE INTERNATIONAL ALLOCATION PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                       VALUE
    SHARES                                                             (000)
- -------------------------------------------------------------------------------
<C>               <S>                                                <C>
</TABLE>

  UNITED KINGDOM (CONT.)
<TABLE>
<C>               <S>                                                <C>
        27,355    United Utilities plc.............................  $      327
         2,637    Vickers plc......................................           6
       121,033    Vodafone Group plc...............................       2,251
         1,107    Wickes plc.......................................           5
        16,674    William Baird plc................................          30
        30,156    WPP Group plc....................................         262
        19,291    Yorkshire Water plc..............................         138
        35,432    Zeneca Group plc.................................       1,676
                                                                     ----------
                                                                         63,600
                                                                     ----------
TOTAL COMMON STOCKS (Cost $291,584)................................     320,189
                                                                     ----------
PREFERRED STOCKS (0.4%)
  AUSTRALIA (0.2%)
       125,978    News Corp., Ltd..................................         867
                                                                     ----------
  AUSTRIA (0.0%)
             3    Bau Holdings AG..................................          --
                                                                     ----------
  GERMANY (0.2%)
         1,617    SAP AG...........................................         517
         3,630    Volkswagen AG....................................         145
                                                                     ----------
                                                                            662
                                                                     ----------
  HONG KONG (0.0%)
        37,500    Johnson Electric Holdings Ltd....................         106
                                                                     ----------
TOTAL PREFERRED STOCKS (Cost $1,505)...............................       1,635
                                                                     ----------
</TABLE>

<TABLE>
<CAPTION>
    NO. OF
   WARRANTS
<C>               <S>                                                <C>
- --------------

WARRANTS (0.0%)
  HONG KONG (0.0%)
         7,850    Hong Kong and China Gas Co,. Ltd., expiring
                    9/30/99........................................          --
         4,300    Hysan Development Co., Ltd., expiring 4/30/99....          --
  THAILAND (0.0%)
         6,349    National Finance & Securities PCL, expiring
                    11/15/99.......................................          --
                                                                     ----------
TOTAL WARRANTS (Cost $0)...........................................          --
                                                                     ----------
</TABLE>
<TABLE>
<CAPTION>
     FACE
    AMOUNT
<C>               <S>                                                <C>
- --------------

FIXED INCOME SECURITIES (0.0%)
  FRANCE (0.0%)
$       62,000    Casino Guichard-Perrachon, Series XW, 4.50%,
                    expiring 7/12/01...............................          55
                                                                     ----------
  PORTUGAL (0.0%)
   PTE   9,600    Jeronimo Martins, SGPS, Zero Coupon, 12/30/04....           6
                                                                     ----------
TOTAL FIXED INCOME SECURITIES (Cost $32)...........................          61
                                                                     ----------
TOTAL FOREIGN SECURITIES (76.0%) (Cost $293,121)...................     321,885
                                                                     ----------

<CAPTION>

     FACE                                                              VALUE
    AMOUNT                                                             (000)
<C>               <S>                                                <C>
- -------------------------------------------------------------------------------
SHORT-TERM INVESTMENT (29.5%)
  REPURCHASE AGREEMENT (29.5%)
$      124,994    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                    4/01/99, to be repurchased at $125,010,
                    collateralized by U.S. Treasury Notes 4.5% due
                    1/31/01, valued at $125,947 (Cost $124,994)....  $  124,994
                                                                     ----------
FOREIGN CURRENCY (0.0%)
     AUD    21    Australian Dollar................................          13
    GBP      2    British Pound....................................           3
    EUR     41    European Monetary Unit...........................          44
     HKD   189    Hong Kong Dollar.................................          24
   JPY      56    Japanese Yen.....................................           1
     NOK    20    Norwegian Krone..................................           3
    SGD     28    Singapore Dollar.................................          16
    SEK      7    Swedish Krona....................................           1
                                                                     ----------
TOTAL FOREIGN CURRENCY (Cost $105).................................         105
                                                                     ----------
TOTAL INVESTMENTS 105.5% (Cost $418,220)...........................     446,984
                                                                     ----------
</TABLE>

<TABLE>
<S>                                                                    <C>
OTHER ASSETS AND LIABILITIES (-5.5%)
  Other Assets.......................................................   243,098
  Liabilities........................................................  (266,236)
                                                                       --------
                                                                        (23,138)
                                                                       --------
NET ASSETS (100%)....................................................  $423,846
                                                                       --------
                                                                       --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................   $423,374
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 35,150,753 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $12.04
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................       $472
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 38,725 outstanding $0.001 par
  value shares (authorized 500,000,000 shares)................     $12.19
                                                                ---------
                                                                ---------
</TABLE>

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

NCS   --  Non-Convertible Shares
PCL   --  Private Company Limited
RFD   --  Ranked for Dividend
RNC   --  Non-Convertible Savings Shares
Foreign -- Prior governmental approval for foreign investments may be required
under certain circumstances.

- --------------------------------------------------------------------------------
Active International Allocation Portfolio

                                       12
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
ASIAN EQUITY PORTFOLIO

The investment objective of the Asian Equity Portfolio is to seek long-term
capital appreciation by investing primarily in equity securities which are
traded on recognized exchanges of Hong Kong, Singapore, Malaysia, Thailand,
Indonesia and the Philippines. The Portfolio may also invest in equity
securities traded on markets in Taiwan, South Korea, India, Pakistan, Sri Lanka
and other Asian developing markets which are open for foreign investment. The
Portfolio does not intend to invest in securities which are principally traded
in Japan or in companies organized under the laws of Japan.

PERFORMANCE COMPARED TO MORGAN STANLEY CAPITAL INTERNATIONAL (MSCI) ALL-COUNTRY
FAR EAST FREE EX-JAPAN INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                      TOTAL RETURNS(2)
                      -------------------------------------------------
                                                              AVERAGE
                                                AVERAGE       ANNUAL
                                              ANNUAL FIVE      SINCE
                         YTD       ONE YEAR      YEARS       INCEPTION
                      ----------  ----------  ------------  -----------
<S>                   <C>         <C>         <C>           <C>
PORTFOLIO -- CLASS
 A..................       2.00%      -9.89%      -11.18%         2.14%
PORTFOLIO -- CLASS
 B..................       1.76      -10.36          N/A        -20.39
INDEX -- CLASS A....       5.02      -10.94        -8.46          2.89
INDEX -- CLASS B....       5.02      -10.94          N/A        -15.58
</TABLE>

1. The MSCI All-Country Far East Free ex-Japan Index is an unmanaged index of
   common stocks and includes Indonesia, Hong Kong, the Philippines, Korea,
   Singapore, Taiwan and Thailand (includes dividends).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED ARE AS MEASURED BY THE MSCI ALL-COUNTRY FAR EAST FREE EX-JAPAN
INDEX AND ARE FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A
GUARANTEE OF THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT
PREDICTIVE OF FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL
FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS
THAN THEIR ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN
RISK CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

For the three months ended March 31, 1999, the Portfolio had a total return of
2.00% for the Class A shares and 1.76% for the Class B shares compared to a
total return of 5.02% for the Morgan Stanley Capital International (MSCI) All
Country Far East Free ex-Japan Index (the "Index"). For the one-year period
ended March 31, 1999, the Portfolio had a total return of -9.89% for the Class A
shares and -10.36% for the Class B shares compared to -10.94% for the Index. For
the five-year period ending March 31, 1999, the average annual total return for
Class A shares was -11.18% compared to -8.46% for the Index. From inception on
July 1, 1991 through March 31, 1999, the average annual total return of Class A
shares was 2.14% compared to 2.89% for the Index. From inception on January 2,
1996 through March 31, 1999 the average annual total return of Class B shares
was -20.39% compared to -15.58% for the Index.

Asian stock markets rose in the first quarter of 1999 as the Index rose 5.0%
during the quarter, led by Taiwan and South Korea. A broader index including
Malaysia, the MSCI All Country Far East Free ex Japan plus Malaysia, rose 5.5%
during the quarter. The Portfolio underperformed the Index during the quarter.
All of the quarter's gains came in March, based on a combination of
international and domestic factors. The rally in the Japanese market improved
sentiment and encouraged international capital inflows into Asia. Most surveys
suggest that international fund managers remain underweight Asian markets
relative to their benchmarks. Positive domestic factors contributing to market
strength include falling domestic interest rates (South Korea), government
policy initiatives (Taiwan, South Korea and Hong Kong) and exchange rate
stability. Markets that lagged during the quarter included Singapore (largely
due to weakness in the Singapore dollar), Thailand, Indonesia and China.

South Korea has shown the strongest signs of recovery from the economic
recession of the past eighteen months. The Koreans aggressively implemented
their IMF program in 1998, producing a savage contraction in domestic
consumption, investment and inventory levels. The contraction rapidly turned the
current account from deficit to surplus, stabilizing and then strengthening the
won. As mentioned in the last quarterly letter, currency strength allowed the
government to relax monetary and fiscal policy in the third quarter of last
year. After a 6% contraction in overall gross domestic product last year, the
Korean government and independent analysts have been busily upgrading growth
expectations for 1999. 1999 consensus growth estimates have moved up to the 3-4%
range. Growth drivers are expected to include a rebound in domestic consumption,
government investment spending and inventory restocking. The Korean government
has aggressively tackled the bad debt situation in its banking system, budgeting
$52.2 billion to recapitalize banks and to purchase non-performing loans. This
program has had two positive effects -- some banks have become attractive
investments and financial intermediation within the economy will revive faster
than expected. Incentives offered by the Korean government encouraged HSBC to
take a control position in one of the

- --------------------------------------------------------------------------------
                                                          Asian Equity Portfolio

                                       13
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
ASIAN EQUITY PORTFOLIO (CONT.)

leading Korean banks, which should enhance competition in the entire sector. The
decline in interest rates has encouraged retail investors and institutions to
switch from fixed income to equity investments. Domestic investing fueled much
of the first quarter's rally. Lower rates have also had a beneficial effect on
the corporate sector, as new bankruptcy filings and other signs of corporate
distress are falling. Finally, we expect corporate restructuring efforts at
certain market leaders, like the Samsung group of companies, to drive returns as
the year progresses.

Hong Kong slightly underperformed the Index during the first quarter but
performed very well in March when it tended to track the rally in Japan very
closely. We are cautious on Hong Kong for a number of fundamental macroeconomic
reasons, but given its size, liquidity and ease of access it has and should
continue to benefit when fresh investment allocations are made to Asia. The
economy remains weak, with rising unemployment, falling consumption, consumer
price deflation, an arguably overvalued exchange rate and high real interest
rates. Consensus forecasters expect a slight gross domestic product contraction
in 1999, although the government is forecasting 1% growth. Due to Hong Kong's
decision to maintain its currency peg to the U.S. dollar even as its neighbors
devalued, companies in Hong Kong have been forced to cut costs to remain
competitive. The resulting deflationary conditions have prevented real interest
rates from falling very far in Hong Kong; cuts in nominal interest rates have
been matched by a fall into outright deflation. The territory has not
experienced real interest rates at these levels for an extended period of time
over the last few decades and this should delay economic recovery and limit
stock market gains. We expect further reductions in nominal and real rates in
1999 but the scope for significant declines is limited given the U.S. dollar peg
and deflation. Revenue growth will be hard to come by in 1999 and much of the
earnings growth will be generated from comparisons with 1998 earnings depressed
by heavy non-recurring provisions. In addition, the Hong Kong Monetary Authority
(HKMA) is designing a program for the disposition of a portion of its extensive
stock holdings accumulated during the market support operations in August.
Positives for the market include improved liquidity in the banking sector, as
banks have repaired their loan-to-deposit ratios, and a number of government
stimulus measures announced in their new budget. Banks have demonstrated a
desire to extend more mortgages with their improved liquidity, and aggressive
mortgage lending will be supportive of the residential property market. We have
maintained a small underweight position in Hong Kong during the first quarter
but have focused the Portfolio on residential property developers and companies
cutting costs ahead of an economic recovery.

The Singapore market lagged the overall Index in the first quarter, partially
due to the 4.8% depreciation of the Singapore dollar relative to the U.S.
dollar. Although this decline negatively affected the returns of the Portfolio
during the first quarter, we believe that this currency weakness is a long-term
positive. This is part of a package designed by the Singapore government to
enhance the economy's competitiveness, and it should yield benefits in the
long-term. The government's drive to cut the cost of doing business in Singapore
and efforts by numerous corporates to enhance returns on capital should bode
well for the market going forward.

The Chinese Index once again was the worst performing East Asian market in the
first quarter. This underperformance reflects the weak fundamentals of most
listed Chinese companies and the challenging economic conditions within China.
The Chinese economy is experiencing persistent deflation, oversupply of most
manufactured goods, slowing exports, high real interest rates and bank asset
quality problems. The Chinese government has responded to these problems with a
massive government-funded infrastructure program. In the first quarter the
Chinese government also began to grapple with external debt problems, as the
decision to place GITIC, a company controlled by the Guangdong provincial
government, into bankruptcy caused foreign bank lenders to reassess risks of
lending to China. We expect the Chinese government will shift from
infrastructure spending to more reform initiatives as 1999 progresses. We
continue to maintain limited exposure to Chinese companies.

The Taiwan market was very volatile in the first quarter, falling persistently
until mid-February and then rebounding strongly when the government announced a
new package of reforms to support the financial system. The Taiwanese economy
has performed relatively well throughout the Asian crisis, maintaining growth
rates near 5%. This is low by Taiwanese standards but high by regional
standards. However, domestic debt levels are high in Taiwan and slower growth,
combined with high real interest rates, was creating a build-up in bad debt. In
addition, domestic banks have under-provided for their non-performing loans.
Taiwan is largely a retail

- --------------------------------------------------------------------------------
Asian Equity Portfolio

                                       14
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
ASIAN EQUITY PORTFOLIO (CONT.)

driven market strongly affected by sentiment and reports of corporate financial
distress were hurting the market. The financial support package introduced in
February has alleviated some of the financial stress within the system and has
significantly improved retail sentiment. The subsequent rally turned Taiwan from
the worst into the best performing market in the quarter, largely based on
rallies in financial, cyclical and semiconductor stocks.

Malaysia's decision to implement capital controls in early September 1998 led to
its removal from the MSCI free Indexes in December. Shifting securities
regulations severely limited the ability of most foreign investors to trade in
Malaysia since September. In February 1999 the securities regulators relaxed
some of the new trading regulations and a new system of exit taxes were imposed
on repatriation of portfolio capital. In the first quarter, we realigned the
portfolio of Malaysian securities we hold and generated some capital gains that
we are repatriating free of exit taxes. As of April 1, 1999, a 20% tax will be
imposed on the repatriation of any "principal" invested in the country as of
September 1, 1998. Capital gains generated since that date can be repatriated
tax-free. The Malaysian authorities will have to substantially relax these
regulations before the market will become accessible enough to attract foreign
investors and return to the MSCI Index.

Several positive themes we expect to drive equity performance in 1999 include
improvements in domestic consumption in most Asian economies and the ability of
companies to enhance their own performance through corporate restructuring.
Restructurings broadly include debt restructuring, divestitures, sale of
strategic stakes to multinationals, business unit shutdowns, mergers or staff
downsizing. We have seen all of the above announced in various forms in 1998 and
in the first quarter of 1999. The markets have clearly rewarded companies that
adopt Western style restructuring with a focus on enhancing shareholder value
and we expect to see that trend continue in the balance of 1999. We will monitor
the progress of the restructurings announced so far and will search for
management teams with the vision and ability to improve returns to shareholders
going forward. Restructuring in Japan could have a positive effect on companies
in the rest of Asia if Japanese managements follow the American model and
outsource production. We have seen growing signs of Japanese companies
outsourcing, particularly electronics components outsourced to Taiwanese
manufacturers. We have invested in a number of companies in Taiwan, Korea and
Singapore that would benefit from a continuation of this trend.

Several risk factors we will be monitoring include the performance of the
Japanese economy, the large supply of new offerings and capital raisings we
expect to see in Asia and growth in the developed economies that are the primary
markets for Asian exports. Upside surprises could include successful bank
recapitalization and economic recovery in Japan and stronger than expected
import demand from the U.S. and Europe.

During 1998 we constructed a fairly defensive Portfolio emphasizing consumer and
technology companies and utilities while limiting our exposure to banks and
properties. During the first quarter of 1999 we increased our exposure to
property companies and cyclicals. In 1999 we are focusing more of our research
time and company visits on companies that have the ability to implement sound
restructuring programs or are sensitive to recoveries in domestic consumption.
We do not believe that all of Asia's economic problems have been solved but the
trends have certainly improved.

Timothy D. Jensen
PORTFOLIO MANAGER

Ashutosh Sinha
PORTFOLIO MANAGER

April 1999

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                                                          Asian Equity Portfolio

                                       15
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ASIAN EQUITY PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                   VALUE
  SHARES                                                           (000)
<C>            <S>                                                <C>
- --------------------------------------------------------------------------

COMMON STOCKS (99.6%)
  HONG KONG (34.8%)
    381,200    Axa China Region Ltd.............................  $    268
    206,000    CLP Holdings Ltd.................................       989
    537,000    Cathay Pacific Airways Ltd.......................       617
    318,900    Cheung Kong Holdings Ltd.........................     2,428
    310,100    China Telecom Ltd................................       516
    286,000    Dairy Farm International Holdings Ltd............       332
    111,000    Dao Heng Bank Group Ltd..........................       367
     13,500    HSBC Holdings plc................................       423
    698,000    Hengan International Group Co., Ltd..............       270
    188,900    Hong Kong & China Gas Co., Ltd...................       267
    943,400    Hong Kong Telecommunications Ltd.................     1,863
    360,100    Hutchison Whampoa Ltd............................     2,834
     58,000    Johnson Electric Holdings Ltd....................       164
    392,100    Li & Fung Ltd....................................       830
    253,000    New World Development Co., Ltd...................       498
    287,000    SmarTone Telecommunications Holdings Ltd.........       831
    342,600    Sun Hung Kai Properties Ltd......................     2,564
    225,200    Swire Pacific Ltd., Class A......................     1,046
    283,900    Television Broadcasts Ltd........................     1,035
        100    VTech Holdings Ltd...............................        --
                                                                  --------
                                                                    18,142
                                                                  --------
  INDIA (2.5%)
     25,000    Aptech Ltd.......................................       556
      1,556    Hero Honda Motors Ltd............................        32
         10    Housing Development Finance Corp., Ltd...........         1
         50    Nestle India Ltd.................................         1
      9,450    NIIT Ltd.........................................       418
      2,805    Reckitt & Coleman of India Ltd...................        32
         50    State Bank of India..............................        --
         80    Tata Engineering & Locomotive Co., Ltd...........        --
      6,126    Tata Infotech Ltd................................       243
                                                                  --------
                                                                     1,283
                                                                  --------
  INDONESIA (2.5%)
    554,500    Gudang Garam.....................................       738
    153,500    Semen Gresik.....................................       175
    117,300    Unilever Indonesia...............................       407
                                                                  --------
                                                                     1,320
                                                                  --------
  KOREA (19.5%)
      2,280    Dae Duck Electronics Co..........................       170
     15,160    Hana Bank........................................       169
      8,330    Hankuk Glass Industry Co., Ltd...................       163
     32,280    Housing & Commercial Bank........................       645
      1,700    Housing & Commercial Bank GDR....................        33
      6,430    Korea Chemical Company Ltd.......................       335
     30,960    Korea Electric Power Corp........................       747
     57,400    Korea Electric Power Corp. ADR...................       728
     24,130    Korea Telecom Corp...............................       953
      7,750    Nong Shim Co., Ltd...............................       423
      9,240    Pohang Iron & Steel Co., Ltd.....................       582

<CAPTION>

                                                                   VALUE
  SHARES                                                           (000)
<C>            <S>                                                <C>
- --------------------------------------------------------------------------

     22,000    Pohang Iron & Steel Co., Ltd. ADR................  $    393
        118    S1 Corp..........................................        22
        608    SK Telecom Co., Ltd..............................       548
     19,984    Samsung Electro-Mechanics Co.....................       458
     38,768    Samsung Electronics Co...........................     3,002
      2,043    Samsung Fire & Marine Insurance Co...............       779
                                                                  --------
                                                                    10,150
                                                                  --------
  MALAYSIA (5.1%)
    130,000    Amway (Malaysia) Holdings Bhd....................       199
    157,000    Carlsberg Brewery Malaysia Bhd...................       411
     21,000    Guinness Anchor Bhd..............................        20
    326,000    Hap Seng Consolidated Bhd........................       172
    136,000    Nestle (Malaysia) Bhd............................       476
    411,000    R.J. Reynolds Bhd................................       374
    170,400    Rothmans of Pall Mall (Malaysia) Bhd.............     1,009
                                                                  --------
                                                                     2,661
                                                                  --------
  PAKISTAN (0.2%)
    250,000    Hub Power Co.....................................        79
                                                                  --------
  PHILIPPINES (2.2%)
    202,450    La Tondena Distillers, Inc.......................       177
     82,630    Manila Electric Co., Class B.....................       273
    373,000    Music Corp.......................................        24
  1,403,600    SM Prime Holdings, Inc...........................       290
    232,950    San Miguel Corp., Class B........................       388
                                                                  --------
                                                                     1,152
                                                                  --------
  SINGAPORE (11.8%)
    192,600    City Developments Ltd............................     1,004
    380,000    Finlayson Global Corp. CVTBD.....................       390
    285,000    Natsteel Electronics Ltd.........................       779
    124,000    Oversea-Chinese Banking Corp. (Foreign)..........       840
     43,000    Rothmans Industries Ltd..........................       222
    114,200    Sembcorp Logistics Ltd...........................       253
    109,200    Singapore Airlines Ltd. (Foreign)................       790
     42,900    Singapore Press Holdings Ltd.....................       474
     89,600    United Overseas Bank Ltd. (Foreign)..............       560
    178,700    Venture Manufacturing (Singapore) Ltd............       807
                                                                  --------
                                                                     6,119
                                                                  --------
  TAIWAN (18.2%)
    101,000    Acer Peripherals Inc.............................       155
    240,000    Acer, Inc........................................       319
     60,000    Advanced Semiconductor Engineering, Inc..........       141
    125,870    Asustek Computer, Inc............................     1,063
    203,000    Bank Sinopac.....................................       112
    110,000    Cathay Life Insurance Co., Ltd...................       355
    109,130    Compal Electronics, Inc..........................       286
     82,560    Compeq Manufacturing Co., Ltd....................       394
    443,480    Far East Textile Ltd.............................       436
     87,000    First Commercial Bank............................       143
    315,920    Hon Hai Precision Industry.......................     1,687
     57,000    Hua Nan Commercial Bank..........................        98
</TABLE>

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Asian Equity Portfolio

                                       16
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ASIAN EQUITY PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                   VALUE
  SHARES                                                           (000)
- --------------------------------------------------------------------------
<C>            <S>                                                <C>
</TABLE>

  TAIWAN (CONT.)
<TABLE>
<C>            <S>                                                <C>
     89,000    International Commercial Bank of China...........  $    104
    522,000    Powerchip Semiconductor Corp.....................       348
     76,800    President Chain Store Corp.......................       238
     15,000    Quanta Computer Inc..............................       253
    126,788    Siliconware Precision Industries Co..............       258
    186,000    Taishin International Bank.......................       105
    799,850    Taiwan Semiconductor Manufacturing Co............     2,510
    126,006    United Micro Electronics Corp., Ltd..............       219
    216,000    Winbond Electronics Corp.........................       256
                                                                  --------
                                                                     9,480
                                                                  --------
  THAILAND (2.8%)
     45,500    Advanced Info Service PCL (Foreign)..............       330
     71,600    BEC World PCL (Foreign)..........................       347
     39,200    Delta Electronics (Thailand) PCL (Foreign).......       172
    360,400    Golden Land Property (Foreign)...................       115
     26,600    Shinawatra Computer Co. PCL (Foreign)............        69
     23,900    Siam Cement Co. (Foreign)........................        81
      7,400    Siam Cement PCL (Foreign)........................       150
     98,300    Thai Farmers Bank PCL (Foreign)..................       199
                                                                  --------
                                                                     1,463
                                                                  --------
TOTAL COMMON STOCKS (Cost $48,657)..............................    51,849
                                                                  --------
</TABLE>

<TABLE>
<CAPTION>
   FACE
  AMOUNT
   (000)
<C>            <S>                                                <C>
- -----------

FOREIGN CURRENCY (2.8%)
HKD   4,542    Hong Kong Dollar.................................       586
INR   5,705    Indian Rupee.....................................       135
MYR   2,211    Malaysian Ringgit................................       582
PHP     540    Philippines Peso.................................        14
KRW   3,458    South Korean Won.................................         3
TWD   3,689    Taiwan Dollar....................................       111
                                                                  --------
TOTAL FOREIGN CURRENCY (Cost $1,296)............................     1,431
                                                                  --------
</TABLE>

<TABLE>
<CAPTION>
                                                                             VALUE
                                                                             (000)
<S>                                                                        <C>
- -------------------------------------------------------------------------------------

TOTAL INVESTMENTS (102.4%) (Cost $49,953)................................  $   53,280
                                                                           ----------
OTHER ASSETS AND LIABILITIES (-2.4%)
  Other Assets...........................................................       4,103
  Liabilities............................................................      (5,338)
                                                                           ----------
                                                                               (1,235)
                                                                           ----------
NET ASSETS (100%)........................................................  $   52,045
                                                                           ----------
                                                                           ----------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................     $50,577
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 6,193,555 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................       $8.17
                                                                ----------
                                                                ----------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................      $1,468
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 181,052 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................       $8.11
                                                                ----------
                                                                ----------
</TABLE>

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

ADR   --  American Depositary Receipt
GDR   --  Global Depositary Receipt
PCL   --  Public Company Limited
Foreign -- Prior governmental approval for foreign investments may be required
under certain circumstances.

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                                                          Asian Equity Portfolio

                                       17
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
ASIAN REAL ESTATE PORTFOLIO

The investment objective of the Asian Real Estate Portfolio is to provide
long-term capital appreciation by investing primarily in equity securities of
companies in the Asian real estate industry whose shares trade on a recognized
stock exchange in Asia and in equity securities of companies organized under the
laws of an Asian country whose business is conducted principally in Asia.

PERFORMANCE COMPARED TO THE GPR GENERAL
REAL ESTATE SECURITIES INDEX -- FAR EAST(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                           TOTAL RETURNS(2)
                               -----------------------------------------
                                                        AVERAGE ANNUAL
                                  YTD       ONE YEAR    SINCE INCEPTION
                               ----------  ----------  -----------------
<S>                            <C>         <C>         <C>
PORTFOLIO -- CLASS A(3)......       4.53%      -9.09%        -18.37%
PORTFOLIO -- CLASS B(3)......       4.51       -8.71         -18.68
INDEX........................       6.01       -5.15         -26.64
</TABLE>

1. The GPR General Real Estate Securities Index -- Far East is a Far East market
   capitalization weighted index of listed property/real estate securities in
   the Far East measuring total return.

2. Total returns for the Portfolio reflect expenses waived and reimbursed if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

3. The Portfolio commenced operations on October 1, 1997.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED ARE FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED
AS A GUARANTEE OF THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS
NOT PREDICTIVE OF FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL
FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS
THAN THEIR ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN
RISK CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

For the three months ended March 31, 1999, the Portfolio had a total return of
4.53% for Class A shares and 4.51% for Class B shares compared to 6.01% for the
GPR General Real Estate Securities Index -- Far East (the "Index"). For the
one-year period ended March 31, 1999, the Portfolio had a total return of -9.09%
for the Class A shares and -8.71% for the Class B shares compared to -5.15% for
the Index. From inception on October 1, 1997 through March 31, 1999, the
Portfolio had an average annual total return of -18.37% for Class A shares and
- -18.68% for Class B shares compared to -26.64% for the Index.

MACRO-ECONOMIC OVERVIEW
Asia put up a credible performance in the first quarter despite Brazil's
currency devaluation in January. This came about amidst an improved global
environment and the unfolding of the so-called "deflationary boom" environment
in the developed world. The U.S. economy and equity market continued to be
robust, while European consumption remained strong despite weakness in
manufacturing activities there. Within Asia, investors warmed to Bank of Japan's
announcement in February to expand the money supply and cap the strength of the
yen in an effort to boost the economy. News of further restructuring stories in
corporate Japan, the most notable being Sony's plan to cut 10% of its work force
and close a fifth of its factories over four years, gave the market another
confidence boost. The news was significant in that Japan remains the world's
major source of deflationary pressure given its outsized output gap of -5.6% of
gross domestic product. There were also a number of other recent positive news
stories that point to possible up-side surprises for the Japanese economy in
1999. These were improvement in the inventory-shipment ratio, moderate recovery
in business confidence, decline in corporate bankruptcies and lastly, but
importantly, significant cuts in marginal tax rates starting this new fiscal
year. On the other hand, a recent series of cuts in employment, wages, capital
expenditure and plant closures will probably moderate the pace of economic
recovery.

Meanwhile, economic conditions in non-Japan Asia have clearly stabilized,
although growth is subdued as the region continues to be plagued by the powerful
deflationary forces. Recent industrial output data indicate that Korea has come
roaring back since the last quarter of 1998, while Thailand and Singapore appear
to have established a clear bottom. In Thailand, the senate has finally passed
several important bankruptcy and foreclosure laws that will pave the way for
corporate restructuring and meaningful reforms. Even the troubled economies of
Malaysia and Indonesia have shown signs of stabilization in the past quarter,
though they are by no means out of the woods yet. Malaysia has relaxed its
capital control rules in a bid to attract foreign capital flows back into the
country, while its effort to clean up the non-performing loan problems in the
banking sector appear to be making good progress. Though politics and social
stability remain an issue, Indonesia's economy has stabilized after big
contractions in 1998. In Australia, economic growth at slightly above 4% in the
second half of 1998 has been stronger than expected. This is primarily the
result of robust consumption, supported by low interest rates and employment
growth.

- --------------------------------------------------------------------------------
Asian Real Estate Portfolio

                                       18
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
ASIAN REAL ESTATE PORTFOLIO (CONT.)

Elsewhere, China's economic performance was worse than expected. Exports fell
10% year on year in January, an outcome that was likely to be attributable to
the state sector. The state-owned enterprises are mainly involved in the
commodity industries, which are plagued by sharply falling prices. China's
financial reforms have also reduced their ability to cut prices, hence eroding
their competitiveness. The only robust growth driver continues to be public
investment, with private consumption and investment remaining anemic. Weak
Chinese exports have translated into poor trade performance for Hong Kong, where
deflationary conditions have persisted with weak private consumption. The two
brighter spots in Hong Kong appear to be the housing and tourist sectors. Recent
tourist industry figures, including a rise in hotel occupancy levels, suggest
that the sector could be on the mend, while consistently firm take-up rates in
the residential market indicate that the property market may be close to a
sustained recovery.

REAL ESTATE MARKETS
The most surprising development in the past quarter is the pace at which the
Singapore residential market is recovering. Based on preliminary statistics from
Jones Lang LaSalle (JLL), more than 3,000 private residential units were sold
during the first three months of 1999. This was close to the 3,100 units
recorded in the last quarter of 1998 and compares favorably with the normalized
annual take-up of roughly 6,000-7,000 units. The performance for the first
quarter of this year was all the more remarkable given the long Chinese New Year
break in February. The strong take-up could be attributable to a better economic
outlook, competitive sale prices and the fierce housing mortgage rate war among
the local banks. This latter factor has brought first-year housing mortgage
rates from around 6.5% to 4% per annum currently. Some banks have even started
to offer fixed rates of around 5-5.5% for the subsequent two years. With the
recent brisk sales, the number of unsold housing units has fallen to about 4,500
units from levels well in excess of 10,000. JLL's latest research indicates that
average capital values of residential properties located in prime districts rose
by about 2.7% to an average of S$755 per square foot (psf) (U.S. $436 psf) as at
end March, while those located outside the prime districts were 3.4% higher at
S$450 psf (U.S. $260 psf).

The Singapore office sector, on the other hand, has remained soft. Average prime
rents and capital values fell by another 8.1% and 10.7% in the first quarter to
S$5.10 psf (U.S. $2.9 psf), and S$1,250 psf (U.S. $722 psf), respectively. Prime
office rents and capital values have now fallen by roughly 40% and 50%,
respectively from their peaks in 1996. Current estimates suggest some 5.9
million sq. ft. of new office space will be completed over the next two years,
bringing vacancy rates close to 18% in year 2000 before improving in 2001 based
on present demand projections.

The Hong Kong residential market continued to experience steady take-up in the
first quarter of 1999, although monthly transaction volumes have returned to a
more sustainable 8,000 level. Mass residential prices, which fell 34% in 1998,
have also stabilized after the fourth quarter's 11% rebound. Major developers
are now planning to accelerate land premium negotiations with the government.
The recent successful land premium negotiations were for sites in Discovery Bay
and Kowloon Station Phase 4. With the stabilization of property prices, the Hong
Kong government announced in February its intention to resume land sale for the
next financial year beginning April 1999.

The Hong Kong office sector remains lackluster as supply continues to overwhelm
demand. Average net effective rent in the core central area fell 48% in 1998 to
around Hong Kong $40 psf (U.S. $5 psf) level. Tenants were generally reluctant
to commit given the uncertainties surrounding the Asian economies. The most
publicized deal was Goldman Sachs' 190,000 square feet lease at the Cheung Kong
Center. For the strata-titled office sector, yields rose from 7-8% to more than
9% as concerns over a possible flood of forced sales by Chinese entities
mounted.

In Japan, housing starts rose by 3.2% in February, an increase for the third
straight month. Overall residential prices, however, fell 2.3% in the last
quarter of 1998. Both commercial land prices and rents in the Tokyo metropolitan
area remained weak, falling by around 3-4% in the last quarter. The vacancy rate
for the Tokyo office market now stands at 5.4%. The ongoing global mergers and
acquisitions and corporate cost cuttings have clearly lessened demand for

- --------------------------------------------------------------------------------
                                                     Asian Real Estate Portfolio

                                       19
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
ASIAN REAL ESTATE PORTFOLIO (CONT.)

office space. The recent demand from foreign corporations looking to expand or
relocate their corporate offices has been somewhat offset by the downsizing of
many Japanese corporations.

Within Australia, the Sydney office market appears to have started to soften in
the face of increased supply, with a number of large tenants pulling out of
advanced negotiations to lease space in new developments probably as a result of
uncertainties posed by the ongoing mergers and acquisitions activities. Sydney's
office vacancy rate rose to 7.7% at the end of 1998 with roughly 1.5 million sq.
ft. of new supply added to the market in 1998. Another 4 million sq. ft. of new
supply space is expected to come on stream in 1999 and 2000, which is likely to
put further pressure on rents if demand does not recover quickly. The Sydney
retail market has remained resilient, due mainly to strong consumer confidence
and continued high real wage growth. Rents continued to firm, especially in
prime Central Business District (CBD) locations where rents rose 10% in 1998.
Vacancies in the CBD declined to 3.7% as at the end of 1998, with regional
shopping malls recording even lower vacancies of 0.8%.

REAL ESTATE SECURITIES

Despite the strong advances in the last quarter of 1998, Asian real estate
shares continue to perform surprisingly well in 1999, on the back of sustained
low interest rates and better confidence in the prospect for an eventual
economic recovery. Large cap property stocks in Singapore and Hong Kong led the
rally, with some beginning to trade at premiums over their net asset values
(NAV), reflecting investor expectation of NAV growth going forward. The mid-cap
companies have also joined the rally, in the process narrowing the discounts to
their underlying NAVs. We notice that analysts have also started to selectively
revise up company NAVs, either as a result of lower interest and capitalization
rates, higher sale prices and volumes achieved on pre-sales, or savvy
acquisitions leading to shareholder value enhancement. We expect these valuation
levels to be sustained, and even exceeded as signs of recovery in the property
markets become more visible. Office rents and capital values in Hong Kong and
Singapore have adjusted substantially and are probably quite close to the
bottom. As they trade at substantial discounts to NAV, the downside risk is
probably quite limited.

Property trusts in Australia have significantly under-performed the Australian
equity market as well as their regional property securities counterparts over
the past quarter. This was a result of higher domestic bond yields, which rose
from 4.7% in mid-December to as high as 5.6% in March, as well as domestic
general equity investors switching out of defensive sectors into cyclical
sectors driven by higher global and domestic growth expectations. Although the
property trusts continue to offer secure earnings and high yield premium
relative to bonds, they seem unlikely to outperform in the regional context over
the medium term, given their relatively rich valuations (Price/NAV premium).

The reason for Japanese real estate shares' strong recovery during the quarter
was due primarily to lower Japanese bond yields and an improved economic
outlook. The central bank's commitment to keep long-term bond yields low and its
willingness to tolerate a weaker yen will probably reduce the downside risk for
the Japanese economy, which is critical to ensure healthy real estate demand. We
continue to hold the view that listed Japanese real estate securities represent
a geared play on the eventual recovery of the Japanese real estate market, but
it is probably premature to expect sustained strong share price performance in
the absence of a visible pick-up in economic activity.

Kiat Seng Seah
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Asian Real Estate Portfolio

                                       20
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

ASIAN REAL ESTATE PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                    VALUE
   SHARES                                                           (000)
<C>             <S>                                                <C>
- --------------------------------------------------------------------------

COMMON STOCKS (95.3%)
  AUSTRALIA (8.2%)
      40,000    Armstrong Jones Retail Fund......................  $    22
      28,000    Centro Properties Group..........................       49
      61,000    IPOH Ltd.........................................       83
      12,000    Westfield Holdings Ltd...........................       81
      26,000    Westfield Trust..................................       56
                                                                   -------
                                                                       291
                                                                   -------
  HONG KONG (40.0%)
      39,000    Cheung Kong Holdings Ltd.........................      297
     290,000    China Resources Beijing Land.....................       48
     880,000    Far East Hotels & Entertainment Ltd..............       80
      26,000    Henderson Land Development Co., Ltd..............      127
     288,400    HKR International Ltd............................      178
     240,000    Hopson Development Holdings Ltd..................       25
      50,000    New Asia Realty & Trust Co., Class A.............       42
      87,000    New World Development Co., Ltd...................      171
     270,000    Regal Hotel International Ltd....................       26
     270,000    Shun Tak Holdings Ltd............................       52
      41,000    Sun Hung Kai Properties Ltd......................      307
      15,000    Swire Pacific Ltd., Class A......................       70
                                                                   -------
                                                                     1,423
                                                                   -------
  JAPAN (20.1%)
      10,000    Daibiru Corp.....................................       75
      31,000    Mitsubishi Estate Co., Ltd.......................      316
      24,000    Mitsui Fudosan Co., Ltd..........................      216
      29,000    Sumitomo Realty & Development Co., Ltd...........      110
                                                                   -------
                                                                       717
                                                                   -------
  PHILIPPINES (4.3%)
     279,400    Ayala Land, Inc., Class B........................       81
     370,000    Filinvest Land, Inc..............................       31
     200,000    SM Prime Holdings, Inc...........................       41
                                                                   -------
                                                                       153
                                                                   -------
  SINGAPORE (17.4%)
      47,000    City Developments Ltd............................      245
      54,000    DBS Land Ltd.....................................       80
      30,000    Keppel Land Ltd..................................       35
      59,000    Marco Polo Developments Ltd......................       74
      40,000    United Industrial Corp., Ltd.....................       21
      50,000    United Overseas Land Ltd.........................       34
     159,000    Wing Tai Holdings Ltd............................      129
                                                                   -------
                                                                       618
                                                                   -------
  TAIWAN (1.7%)
     110,000    Delpha Construction Co., Ltd.....................       61
                                                                   -------

<CAPTION>

                                                                    VALUE
   SHARES                                                           (000)
<C>             <S>                                                <C>
- --------------------------------------------------------------------------

  THAILAND (3.6%)
     177,000    MBK Properties and Development PCL...............  $    92
       8,900    Oriental Hotel (Thailand) PCL....................       38
                                                                   -------
                                                                       130
                                                                   -------
TOTAL COMMON STOCKS (Cost $2,907)................................    3,393
                                                                   -------
</TABLE>

<TABLE>
<CAPTION>
    FACE
   AMOUNT
   (000)
<C>             <S>                                                <C>
- ------------

CONVERTIBLE DEBENTURE (3.6%)
  SINGAPORE (3.6%)
$        170    Wing Tai Holdings Ltd., 1.50% 7/15/02 (Cost
                  $92)...........................................      129
                                                                   -------
TOTAL FOREIGN SECURITIES (98.9%) (Cost $2,999)...................    3,522
                                                                   -------
FOREIGN CURRENCY (0.9%)
  AUD  7,261    Australian Dollar................................        4
  HKD 21,591    Hong Kong Dollar.................................        3
 PHP  10,800    Philippines Peso.................................       --
 TWD 850,890    Taiwan Dollar....................................       26
                                                                   -------
TOTAL FOREIGN CURRENCY (Cost $34)................................       33
                                                                   -------
TOTAL INVESTMENTS (99.8%) (Cost $3,033)..........................    3,555
                                                                   -------
</TABLE>

<TABLE>
<S>                                                               <C>
OTHER ASSETS AND LIABILITIES (0.2%)
  Other Assets..................................................        57
  Liabilities...................................................       (51)
                                                                  --------
                                                                         6
                                                                  --------
NET ASSETS (100%)...............................................  $  3,561
                                                                  --------
                                                                  --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................     $2,773
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 399,895 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $6.93
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................       $788
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 113,156 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $6.96
                                                                ---------
                                                                ---------
</TABLE>

- --------------------------------------------------------------------------------
                                                     Asian Real Estate Portfolio

                                       21
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EMERGING MARKETS PORTFOLIO

The investment objective of the Emerging Markets Portfolio is to provide
long-term capital appreciation by investing in equity securities of emerging
country issuers.

PERFORMANCE COMPARED TO THE IFC GLOBAL TOTAL RETURN COMPOSITE INDEX AND THE
MORGAN STANLEY CAPITAL INTERNATIONAL (MSCI) EMERGING MARKETS FREE INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                                         TOTAL RETURNS(2)
                                             -----------------------------------------
                                                                              AVERAGE
                                                                 AVERAGE      ANNUAL
                                                        ONE       ANNUAL       SINCE
                                              YTD      YEAR     FIVE YEARS   INCEPTION
                                             ------   -------   ----------   ---------
<S>                                          <C>      <C>       <C>          <C>
PORTFOLIO -- CLASS A.......................  11.62%   -23.05%     -5.30%       5.12%
PORTFOLIO -- CLASS B.......................  11.61    -23.23        N/A       -2.89
IFC GLOBAL TOTAL RETURN COMPOSITE INDEX --
CLASS A....................................   8.86    -20.06      -5.42        3.88
MSCI EMERGING MARKETS FREE INDEX -- CLASS
A..........................................  12.44    -20.95      -5.34        4.88
IFC GLOBAL TOTAL RETURN COMPOSITE INDEX --
CLASS B....................................   8.86    -20.06       N/A        -7.32
MSCI EMERGING MARKETS FREE INDEX -- CLASS
B..........................................  12.44    -20.95       N/A        -7.73
</TABLE>

1. The IFC Global Total Return Composite Index is an unmanaged index of common
   stocks and includes developing countries in Latin America, East and South
   Asia, Europe, the Middle East and Africa (includes dividends). The MSCI
   Emerging Markets Free Index is a market capitalization weighted index
   composed of companies that are representative of the market structure of
   developing countries in Latin America, Asia, Eastern Europe, the Middle East
   and Africa. (includes dividends)

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED IN THIS OVERVIEW ARE AS MEASURED BY THE MORGAN STANLEY CAPITAL
INTERNATIONAL (MSCI) EMERGING MARKETS COUNTRY OR REGIONAL INDICES, ARE FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF THE
PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK
CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

For the three months ended March 31, 1999, the Portfolio had a total return of
11.62% for the Class A shares and 11.61% for the Class B shares compared to
8.86% for the IFC Global Total Return Composite Index (the "IFC Index") and
12.44% for the Morgan Stanley Capital International (MSCI) Emerging Markets Free
Index (the "MSCI Index"). For the one-year period ended March 31, 1999, the
Portfolio had a total return of -23.05% for the Class A shares and -23.23% for
the Class B shares compared to -20.06% for the IFC Index and -20.95% for the
MSCI Index. For the five-year period ended March 31, 1999, the average annual
total return of Class A shares was -5.30% compared to -5.42% for the IFC Index
and -5.34% for the MSCI Index. From inception on September 25, 1992 through
March 31, 1999, the average annual total return for Class A shares was 5.12%
compared to 3.88% for the IFC Index and 4.88% for the MSCI Index. From inception
on January 2, 1996 through March 31, 1999, the average annual total return of
Class B shares was -2.89% compared to -7.32% for the IFC Index and -7.73% for
the MSCI Index.

After two consecutive positive quarters in the Emerging Markets Equity asset
class, is it still too early to declare the end of the emerging markets bear
market? Events this past quarter suggest that we could be entering a turnaround
phase. The major event which took place this quarter was the devaluation of the
Brazilian currency, the real, thus removing the "Sword of Damocles" that had
hung over this market for months. The truly amazing feature of the devaluation
was not that it occurred, but that the real lost roughly 30% in value and the
Brazilian equity market finished the quarter in positive territory in US
dollars. Before delving into the particulars of Brazil, however, we would like
to first review the major events which took place in the first quarter in the
Emerging Markets:

- -  Brazil's currency devalued roughly 30% against the U.S. dollar.

- -  Turkish authorities captured Kurdish terrorist Abdullah Ocalan, boosting the
   political fortunes of the existing government and sentiment in that market.

- -  On the back of a Euro-area economic slow down, current account and fiscal
   deficit deterioration caused currency weakness and significant equity market
   underperformance in Eastern Europe (Czech Republic, Hungary, Poland),
   effectively stripping them of their "safe haven" status.

- -  Lack of hyperinflation and the strong oil price recovery propelled Russia to
   the rank of top performing emerging market in the first quarter.

- -  A market-friendly budget in India boosted sentiment in that market as it
   posted strong gains for the quarter.

- -  The strong price of oil, robust U.S. economy, and lack of meltdown in Brazil
   allowed Mexico to differentiate itself from the rest of Latin America and
   stage a dramatic recovery from last year's anemic performance.

- --------------------------------------------------------------------------------
Emerging Markets Portfolio

                                       22
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EMERGING MARKETS PORTFOLIO (CONT.)

The devaluation of the real has removed one of the last remaining identifiable
risks in the asset class, and the market action in the wake of this devaluation
has been quite encouraging. As previously mentioned, despite a 30% decline in
the value of the currency vis-a-vis the U.S. dollar (USD), Brazil ended the
quarter in positive territory in USD and was up 36.8% in the month of March.
While the devaluation was uncontrolled, the surprise selection of ex-Soros fund
manager Arminio Fraga to head Brazil's Central Bank injected a much needed boost
of confidence precisely when the currency markets were on the verge of spiraling
out of control. Although there were tense moments in the quarter, and the
country is by no means out of the woods, the trends evolving by quarter's end
point to a more stable outlook for the country for the balance of the year.

PORTFOLIO REVIEW AND OUTLOOK

Our stock selection and allocation decisions in Brazil had the single largest
positive impact on performance. Specifically, underweighting Brazil going into
the devaluation and then quickly moving to a neutral weight after the
devaluation was favorable for performance. Additionally, our holdings, largely
in the telecommunications sector, did well. Other contributors to performance
included our underweight positions in Colombia (- 14.2%) and Venezuela (-13.3%)
as well as strong stock selection in Mexico, India, South Korea, and Thailand.

The Latin American region performed well during the quarter, rising 12.9% in
U.S. dollars. The most notable market event throughout all the emerging markets
was the devaluation of the Brazilian currency, the real. The currency plunged
40% in January, then retraced some of its decline to end the quarter down 30%.
Most emerging markets investors anticipated the devaluation, but few, if any,
expected the Brazilian equity market to recover so quickly. By quarter-end, the
equity market had gained 5.5% in US dollars. Fueling the market was the
unexpected appointment of Arminio Fraga, the former portfolio manager of George
Soros' Quantum Emerging Markets Growth Fund, as head of the Central Bank. Fraga
offers financial market expertise and shareholder focus, which has aided market
sentiment.

As mentioned above, over the course of the quarter, we added to our Brazilian
holdings and are now overweight relative to the MSCI Index. Our cautious
optimism is based on several points; interest rates are declining, foreign banks
are largely rolling over their loans to Brazilian borrowers, the central bank is
running a tight monetary policy, and inflation seems under control. Within
Brazil, we are focusing on the telecommunications industry which offers strong
management, high pent-up demand, and room for cost efficiencies.

Mexico was the best performing Latin market, gaining 28.7% in U.S. dollar terms.
Its market has been supported by falling interest rates, attractive corporate
earnings, and continued strong U.S. economic growth. Also buoying the market has
been Mexico's ability to differentiate itself from other Latin markets,
specifically Brazil. Markets within regions are typically highly correlated
during times of crisis, but Mexico was able to de-couple from Brazil. As a
result of Mexico's positive corporate and macroeconomic fundamentals, investors
have deemed it the "safe haven" within the region, further bolstering the
market. Given Mexico's favorable macro and micro scenario, we added to our
position in the beginning of the quarter, and later trimmed as the market
continued to climb higher. By quarter-end, we were market weight, focusing on
consumer-related industries, such as telecommunications, beverages, retailing,
and health and personal care.

Asia gained 11.1% in the first quarter led by India, which rose 26.4%. The
government's announcement of a better-than-expected budget spurred the Indian
market. Our stock holdings fared well, and we trimmed some positions as the
market rallied. We are currently at neutral weight as we continue to find many
attractive stock opportunities. We are less compelled by the macro story, as
there are little signs of any improvement with respect to its economic
fundamentals. Our Indian portfolio is tilted towards technology-based stocks,
such as Infosys, a $3 billion market capitalization computer software company.

Taiwan's market rose 11.6% in the first quarter owing to a financial sector
reform package announced by the government. We are impressed with Taiwanese
companies as they offer strong management and excellent earnings growth
potential. We added to our Taiwanese positions during the quarter and are now
modestly overweight the MSCI Index. As in India, we are focusing on the
technology sector. For example, Taiwan Semiconductor is a leader in making
integrated circuits for other companies. It is expected to benefit from both a
cyclical upturn in semiconductors and a long-term trend towards outsourcing
various computer components.

- --------------------------------------------------------------------------------
                                                      Emerging Markets Portfolio

                                       23
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EMERGING MARKETS PORTFOLIO (CONT.)

Our favorite Asian market is South Korea, where we are overweight the MSCI Index
owing to both strong macro and micro fundamentals. The Korean government has
come a long way over the past year to improve its economic condition. During the
quarter, the Korean government focused on improving the non-performing loan
situation in its banking sector. Over $50 billion has been budgeted to
recapitalize its banks and to purchase non-performing loans. Also beneficial has
been the decline in interest rates which has encouraged retail investors and
institutions to switch from fixed income to equity investments. We also expect
to see a continuation of corporate restructuring. We have significant weightings
in Samsung Electronics and also within the telecommunications industry. Samsung
Electronics is a leading semiconductor, electronics, and telecommunications
equipment manufacturer. The company is positioned to benefit from a cyclical
upturn in semiconductor demand as well as its own corporate restructuring.

Emerging Europe and the Middle East gained 14.3% in the first quarter. Russia
and Turkey were the star performers, each gaining more than 50%. We are market
weight Russia, as we believe it is un-wise to underweight such a volatile, "low
valuation" country. Most recently, the market has been driven by positive
developments in IMF negotiations and oil price increases.

We added to and are now overweight Turkey as its political, economic, and
interest rate scenario begins to improve. The capture of Kurdish leader Abdullah
Ocalan could be very positive as it increases the likelihood that a
reform-minded coalition will be victorious in the April elections. The World
Bank and IMF have indicated they will provide financial support to Turkey
contingent on the implementation of various reforms (banking, social security,
and agricultural subsidies). In Turkey, our largest weighting is in the banking
industry as we expect interest rates to trend lower.

Hungary (-15.2%) and Poland (+2.3%) were market laggards during the quarter. We
trimmed both markets due to their deteriorating macro environment. Both
countries have widening current account deficits, which puts pressure on their
currencies and may prevent the central banks from lowering interest rates. We
are now at neutral weight in Hungary, but have maintained an overweight position
in Poland.

We have also trimmed Greece and are now underweight the market. Having returned
more than 80% in 1998 and 9.2% year-to-date, we have looked to Greece as a
source of cash. Greece has recently experienced some weakness given its role in
the handover of Ocalan to Turkey and the Kosovo crisis. Longer-term, we remain
positive on Greece as its market will be bolstered by its future induction into
the (EMU).

Israel, a market we are overweight, has performed well gaining 16.4% during the
quarter. The market was fuelled by a recent IMF report which forecasted better
economic and inflation figures. Israel is another market offering outstanding
technology-based companies with solid management and strong earnings growth
potential.

South Africa rose 13.1% in the first quarter responding favorably to interest
rate cuts. We expect continued market strength on the back of further rate cuts
and a benign upcoming election. We added to our South African weighting, though
we maintain an underweight position. We have significant exposure to the
financial services industry given our interest rate call and to the beverage
industry as disposable income is expected to rise. One of our large holdings,
South African Breweries, is a world class brewing operation with exposure to
several emerging markets. The company has excellent management and is
attractively valued relative to its emerging markets and global peers.

Robert L. Meyer
PORTFOLIO MANAGER

Andy B. Skov
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Emerging Markets Portfolio

                                       24
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING MARKETS PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                        VALUE
    SHARES                                                              (000)
<C>                <S>                                                <C>
- -------------------------------------------------------------------------------

COMMON STOCKS (UNLESS OTHERWISE NOTED) (96.3%)
  ARGENTINA (2.0%)
              6    Acindar, Class B.................................  $      --
        354,268    Telecom Argentina ADR............................      9,720
        108,019    Telefonica de Argentina ADR......................      3,268
        135,238    YPF ADR..........................................      4,268
                                                                      ---------
                                                                         17,256
                                                                      ---------
  BRAZIL (12.0%)
     73,602,000    Banco Bradesco (Preferred).......................        395
    295,998,880    Banco Nacional (Preferred).......................          9
      5,229,313    Brahma (Preferred)...............................      2,461
    207,330,066    CEMIG (Preferred)................................      4,636
        173,325    CEMIG ADR (Preferred)............................      3,856
     (e)103,238    CEMIG ADR (Preferred)............................      2,297
         98,865    Coteminas ADR....................................        291
     12,714,900    Coteminas........................................        719
        247,512    CRT (Preferred)..................................         75
        569,337    CRT RFD (Preferred)..............................        173
     33,059,644    CRT (Preferred)..................................     10,024
          3,665    CVRD, Class A (Preferred)........................         54
        171,164    CVRD ADR (Preferred).............................      2,503
     98,021,210    Embratel (Preferred).............................      1,647
         66,192    Embratel ADR.....................................      1,105
    119,019,000    Lojas Arapua (Preferred).........................         --
        120,830    Lojas Arapua GDR (Preferred).....................         --
     39,236,000    Pao de Acucar (Preferred)........................        579
         26,429    Pao de Acucar ADR................................        386
     65,121,000    Petrobras (Preferred)............................      9,037
         42,860    Petrobras ADR (Preferred)........................        597
     35,423,000    Renner Participacoes (Preferred).................         26
    122,109,610    Telebras (Preferred).............................         21
        284,574    Telebras ADR (Preferred).........................     22,944
    363,515,510    Tele Celular Sul (Preferred).....................        729
         18,400    Tele Celular Sul.................................        352
         29,711    Tele Centro Sul..................................      1,372
    317,814,610    Tele Centro Sul (Preferred)......................      2,963
    168,257,700    Telecom Brasil (Preferred).......................     13,657
              1    Telecomunicacoes de Sao Paulo....................         --
    442,516,610    Tele Leste Celular (Preferred)...................        294
         11,175    Telemig Celular..................................        293
    386,812,716    Telemig Celular (Preferred)......................        521
    253,287,610    Tele Nordeste Celular (Preferred)................        275
          8,975    Tele Nordeste Celular............................        200
     92,670,610    Tele Norte Celular (Preferred)...................         56
    122,109,610    Tele Norte Leste (Preferred).....................      1,865
         93,088    Tele Norte Leste (ADR)...........................      1,431
     20,876,000    Telerj Celular, Class B..........................        353
    227,910,610    Telesp Celular (Preferred).......................      1,900
         20,546    Telesp Celular...................................        430
     85,101,399    Telesp Celular, Class B..........................      3,176
     44,515,610    Telesp (Preferred)...............................        932
    337,684,610    Tele Sudeste Celular (Preferred).................      1,378
          4,165    Tele Sudeste Celular.............................         84

<CAPTION>

                                                                        VALUE
    SHARES                                                              (000)
<C>                <S>                                                <C>
- -------------------------------------------------------------------------------

        469,340    Unibanco GDR (Preferred).........................  $   9,035
        318,900    Usiminas (Preferred).............................        545
         62,535    Usinas Siderurgicas de Minas Gerais S.A..........        106
                                                                      ---------
                                                                        105,782
                                                                      ---------
  CHILE (1.1%)
        106,800    CCU ADR..........................................      2,330
        125,265    Endesa ADR.......................................      1,761
        186,545    Enersis ADR......................................      5,002
         67,086    Santa Isabel ADR.................................        587
                                                                      ---------
                                                                          9,680
                                                                      ---------
  CHINA (0.8%)
        133,010    Huaneng Power International, Inc. ADR............      1,322
        235,136    Yanzhou Coal Mining Co., Ltd. ADR................      1,866
      4,887,000    Zhejiang Expressway Co., Ltd., Class H...........        832
     15,463,000    Zhenhai Refining & Chemical Co., Ltd., Class H...      2,674
                                                                      ---------
                                                                          6,694
                                                                      ---------
  CZECH REPUBLIC (0.7%)
        140,440    SPT Telecom a.s..................................      1,812
        338,339    SPT Telecom a.s. GDR.............................      4,532
                                                                      ---------
                                                                          6,344
                                                                      ---------
  EGYPT (0.8%)
         53,084    Al-Ahram Beverages Co............................      1,639
          5,160    Al-Ahram Beverages Co. GDR.......................        159
             54    Ameriyah Cement Co...............................          1
            346    Commercial International Bank....................          4
        106,838    Eastern Tobacco..................................      3,028
         22,500    Egypt Gas Co.....................................      1,491
            450    Egyptian Finance & Industrial....................          7
             25    Helwan Cement....................................         --
         37,981    Industrial & Engineering.........................        497
          4,975    North Cairo Flour Mills Co.......................         76
          4,310    Paints & Chemical Industry GDR...................         27
                                                                      ---------
                                                                          6,929
                                                                      ---------
  GREECE (5.9%)
         52,740    Alpha Credit Bank................................      3,512
          8,275    Commercial Bank Of Greece........................      1,296
          9,410    Ergo Bank........................................        706
         51,860    Hellenic Bottling Co.............................      1,543
        899,388    Hellenic Telecommunication Organization (OTE)....     21,889
      1,078,103    Hellenic Telecommunication Organization (OTE)
                     ADR............................................     12,600
        154,650    National Bank of Greece..........................     10,493
                                                                      ---------
                                                                         52,039
                                                                      ---------
</TABLE>

- --------------------------------------------------------------------------------
                                                      Emerging Markets Portfolio

                                       25
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING MARKETS PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                        VALUE
    SHARES                                                              (000)
- -------------------------------------------------------------------------------
<C>                <S>                                                <C>
  HUNGARY (1.1%)
        147,065    Magyar Tavkozlesi Rt.............................  $     784
         49,516    Matav Rt.........................................      1,325
        140,645    Matav Rt. ADR....................................      3,762
         69,436    MOL Magyar Olaj-es Gazipari Rt. GDR
                     (Registered)...................................      1,423
         52,235    OTP Bank Rt......................................      2,026
                                                                      ---------
                                                                          9,320
                                                                      ---------
  INDIA (9.3%)
          5,650    Apollo Tyres Ltd.................................          7
         41,000    Aptech Ltd.......................................        912
            433    Associated Cement Cos., Ltd......................         15
      1,449,800    Bharat Heavy Electricals Ltd.....................      8,116
        990,300    Container Corp. of India Ltd.....................      4,106
        167,000    Digital Equipment (India) Ltd....................      1,531
          1,900    Federal Bank Ltd.................................          2
        191,700    Gujarat Ambuja Cements Ltd.......................      1,356
        113,850    HCL Infosystems Ltd..............................      1,680
             63    Hero Honda Motors Ltd............................          1
        410,711    Hero Honda Motors Ltd............................      8,473
         83,050    Hindustan Lever Ltd..............................      4,432
          1,000    Hindustan Lever Ltd..............................         53
         27,995    Housing Development Finance Corp., Ltd...........      1,505
         32,377    Housing Development Finance Corp., Ltd...........      1,740
       (g)4,900    India Magnum Fund Ltd., (The) Class A............        159
        176,200    Infosys Technology Ltd...........................     12,148
        196,449    ITC Ltd..........................................      4,459
          1,547    Larsen & Toubro Ltd..............................          9
        368,400    Mahanagar Telephone Nigam Ltd....................      1,534
  (g)42,697,100    Morgan Stanley Growth Fund.......................      7,296
         70,381    MRF Ltd., Class B................................      3,215
          9,000    NIIT Ltd.........................................        398
         86,550    NIIT Ltd.........................................      3,825
        220,000    Saytam Computer Services Ltd.....................      8,411
         45,000    Sri Venkatesa Mills Ltd..........................          6
            550    State Bank of India..............................          3
          2,608    Sudarshan Chemical Industries Ltd................          3
        495,000    Tata Engineering & Locomotive Co., Ltd...........      1,974
        197,700    Tata Engineering & Locomotive Co., Ltd...........        788
        149,000    Zee Telefilms Ltd................................      3,466
                                                                      ---------
                                                                         81,623
                                                                      ---------
  INDONESIA (1.3%)
      5,008,641    Gudang Garam.....................................      6,673
     13,249,055    Indah Kiat Pulp & Paper Corp. (Foreign)..........      3,753
        931,600    Semen Gresik.....................................      1,061
                                                                      ---------
                                                                         11,487
                                                                      ---------

<CAPTION>

                                                                        VALUE
    SHARES                                                              (000)
<C>                <S>                                                <C>
- -------------------------------------------------------------------------------

  ISRAEL (4.5%)
        794,800    Bank Hapoalim Ltd. (Registered)..................  $   1,867
      1,134,000    Bank Leumi Le-Israel.............................      2,013
         46,230    Converse Technology, Inc.........................      3,929
        216,300    Dor Energy 1988 Limited..........................        714
        189,574    ECI Telecommunications Ltd.......................      6,635
         79,140    Gilat Satellite Networks Ltd.....................      4,748
         78,345    Koor Industries Ltd..............................      8,308
         87,526    NICE-Systems Ltd. ADR............................      2,582
         17,875    NICE-Systems Ltd.................................        530
         86,770    Orbotech Ltd.....................................      4,263
         28,020    Orckit Communications Ltd........................        585
         62,295    Teva Pharmaceutical Industries Ltd. ADR..........      2,955
                                                                      ---------
                                                                         39,129
                                                                      ---------
  KOREA (12.9%)
        115,200    Hankuk Glass Industry Co., Ltd...................      2,253
        392,240    Housing & Commercial Bank........................      7,832
        136,700    Korea Electric Power Corp........................      3,298
        876,810    Korea Electric Power Corp. ADR...................     11,125
        450,640    Korea Telecom Corp...............................     17,799
        147,183    Pohang Iron & Steel Co., Ltd.....................      9,271
          1,158    S1 Corp..........................................        219
        195,929    Samsung Electro-Mechanics Co.....................      4,487
        593,382    Samsung Electronics Co...........................     45,943
         21,364    Samsung Electronics Co. GDR......................        830
         11,231    SK Telecom Co., Ltd..............................     10,114
                                                                      ---------
                                                                        113,171
                                                                      ---------
  MALAYSIA (1.0%)
         36,000    Kuala Lumpur Kepong Bhd..........................         45
        527,000    Nestle (Malaysia) Bhd............................      1,845
        656,000    Rothmans of Pall Mall (Malaysia) Bhd.............      3,884
      1,371,000    Telekom Malaysia Bhd.............................      2,760
                                                                      ---------
                                                                          8,534
                                                                      ---------
  MEXICO (12.0%)
        349,359    Alfa, Class A....................................      1,061
      1,417,139    Banacci, Class B.................................      3,068
        966,103    Banacci, Class L.................................      1,939
      1,080,901    Bancomer, Class B................................        370
        277,930    Bancomer, Class C ADR............................      1,911
        664,209    Carso, Class A1..................................      2,730
        356,165    Cemex CPO........................................      1,454
        919,867    Cemex CPO ADR....................................      7,474
        307,336    Cemex, Class B...................................      1,290
        431,157    Cemex, Class B ADR...............................      3,611
      1,454,796    Cifra, Class C...................................      2,248
        684,283    Cifra, Class V...................................      1,074
        202,768    Cifra, Class V ADR...............................      3,138
        318,773    Fomento Economico Mexicano ADR...................      9,862
      1,833,247    Kimberly-Clark, Class A..........................      6,907
</TABLE>

- --------------------------------------------------------------------------------
Emerging Markets Portfolio

                                       26
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING MARKETS PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                        VALUE
    SHARES                                                              (000)
- -------------------------------------------------------------------------------
<C>                <S>                                                <C>
</TABLE>

  MEXICO (CONT.)
<TABLE>
<C>                <S>                                                <C>
        834,035    Televisa CPO GDR.................................  $  26,168
        470,273    Telmex, Class L ADR..............................     30,803
                                                                      ---------
                                                                        105,108
                                                                      ---------
  PAKISTAN (1.0%)
             33    Crescent Textile Mills Ltd.......................         --
             50    D.G. Khan Cement Ltd.............................         --
      4,626,500    Fauji Fertilizer Co., Ltd........................      4,949
        384,600    Hub Power Co.....................................        121
      1,503,198    Pakistan State Oil Co., Ltd......................      2,449
        430,900    Pakistan Telecommunications Corp., Class A.......        154
      5,627,702    Sui Northern Gas.................................      1,057
                                                                      ---------
                                                                          8,730
                                                                      ---------
  PERU (0.0%)
             49    Cementos Lima....................................         --
                                                                      ---------
  PHILIPPINES (1.0%)
        780,620    Manila Electric Co., Class B.....................      2,579
      2,155,910    San Miguel Corp., Class B........................      3,588
     13,876,500    SM Prime Holdings, Inc...........................      2,865
                                                                      ---------
                                                                          9,032
                                                                      ---------
  POLAND (2.2%)
         43,191    Bank Polska Kasa Opieki Grupa Pekao..............        449
            828    Bank Slaski......................................         35
         74,200    BIG Bank Gdanski.................................        133
         33,400    Eastbridge N.V...................................      2,246
        369,838    Elektrim.........................................      3,934
         30,688    Powszechny Bank Kredytowy........................        522
        111,002    Prokom Software GDR..............................      1,881
      1,774,105    Telekomunikacja Polska GDR.......................      9,625
        112,788    Wielkopolski Bank Kredytowy......................        621
                                                                      ---------
                                                                         19,446
                                                                      ---------
  RUSSIA (1.4%)
        592,359    Alliance Cellulose Ltd...........................        911
         77,600    AO Tatneft ADR...................................        213
         88,970    Lukoil Holding ADR...............................      2,569
     37,259,635    Mustcom..........................................      4,087
         31,300    RAO Unified Energy Systems GDR...................        155
         39,300    Rostelecom (ADR).................................        184
        317,851    Russian Telecom Development Corp.................        735
            990    Storyfirst Communications, Inc., Class C.........        239
          2,640    Storyfirst Communications, Inc., Class D.........        638
          3,250    Storyfirst Communications, Inc., Class E.........        785
          1,331    Storyfirst Communications, Inc., Class F.........        643
<CAPTION>

                                                                        VALUE
    SHARES                                                              (000)
<C>                <S>                                                <C>
- -------------------------------------------------------------------------------

        155,900    Surgutneftgaz ADR................................  $     994
         35,900    Vimpel-Communications ADR........................        556
                                                                      ---------
                                                                         12,709
                                                                      ---------
  SINGAPORE (0.0%)
        431,000    Want Want Holdings Ltd...........................        435
                                                                      ---------
  SOUTH AFRICA (8.0%)
      1,042,790    ABSA Group Ltd...................................      4,990
          2,020    Anglo American Corp..............................         70
         99,720    Anglo American Corporation of South Africa,
                     Ltd............................................      3,462
        898,941    Bidvest Group Ltd................................      7,364
      7,565,177    BOE Corp., Ltd., Class N.........................      5,522
        977,509    BOE Ltd..........................................        872
         96,840    De Beers Centenary AG............................      1,869
         48,070    De Beers Consolidated Mines ADR..................        910
         39,960    Dimension Data Holdings Ltd......................        178
        828,650    Ellerine Holdings Ltd............................      3,286
      6,068,930    FirstRand Ltd....................................      5,818
        212,405    Liberty Life Association of Africa Ltd...........      2,632
        278,958    Nedcor Ltd.......................................      6,226
      3,426,570    New Africa Investments Ltd., Class N.............      1,973
        223,950    Persetel Holdings Ltd............................      1,747
         16,120    Primedia Ltd., Class N...........................         31
        606,000    Rembrandt Group Ltd..............................      4,355
        340,400    South African Breweries Ltd......................      2,954
      1,657,710    South African Breweries Ltd......................     14,582
      1,372,254    The Education Investment Corp., Ltd..............      1,670
                                                                      ---------
                                                                         70,511
                                                                      ---------
  TAIWAN (11.1%)
      1,240,000    Acer, Inc........................................      1,650
      1,614,000    Advanced Semiconductor Engineering, Inc..........      3,798
      1,481,750    Asustek Computer, Inc............................     12,518
      2,259,000    Bank Sinopac.....................................      1,240
        742,693    Compal Electronics, Inc..........................      1,950
        162,000    Compeq Manufacturing Co., Ltd....................        772
      4,992,000    Far East Textile Ltd.............................      4,910
      1,577,000    First Commercial Bank............................      2,593
      1,054,000    Formosa Plastics Corp............................      1,733
      2,783,000    Hon Hai Precision Industry.......................     14,861
      1,732,000    Hua Nan Commercial Bank..........................      2,979
        798,000    International Commercial Bank of China...........        929
      1,274,000    Nan Ya Plastics Corp.............................      1,872
        566,000    President Chain Store Corp.......................      1,750
        102,000    Quanta Computer Inc..............................      1,723
              1    Shinkong Synthetic Fiber.........................         --
      2,461,072    Siliconware Precision Industries Co..............      5,012
      1,438,000    Taishin International Bank.......................        811
      5,027,000    Taiwan Semiconductor Manufacturing Co............     15,773
</TABLE>

- --------------------------------------------------------------------------------
                                                      Emerging Markets Portfolio

                                       27
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING MARKETS PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                        VALUE
    SHARES                                                              (000)
- -------------------------------------------------------------------------------
<C>                <S>                                                <C>
</TABLE>

  TAIWAN (CONT.)
<TABLE>
<C>                <S>                                                <C>
        554,031    Taiwan Semiconductor Manufacturing Co. ADR.......  $  13,089
      3,403,000    United Micro Electronics Corp., Ltd..............      5,904
         43,550    Winbond Electronics Corp.........................      1,276
                                                                      ---------
                                                                         97,143
                                                                      ---------
  THAILAND (2.3%)
      1,103,950    Advanced Information Services PCL (Foreign)......      7,996
        716,300    BEC World PCL (Foreign)..........................      3,471
        448,350    Delta Electronics (Thailand) PCL (Foreign).......      1,970
      1,631,800    Shinawatra Computer Co. PCL (Foreign)............      4,258
        689,900    Siam Cement PCL (Foreign)........................      2,333
                                                                      ---------
                                                                         20,028
                                                                      ---------
  TURKEY (3.7%)
         73,090    Akbank T.A.S.....................................      4,167
    153,692,000    Dogan Sirketler Grubu Holding....................      1,380
     31,243,100    Ege Biracilik....................................      3,265
     69,192,932    Erciyas Biracilik................................      1,725
     14,312,000    Garanti Bankasi A.S..............................        595
      8,679,000    Koc Holding A.S..................................      1,082
      1,153,000    Migros (Registered)..............................      1,514
     22,801,000    Tupras-Turkiye Petrol Rafinerileri A.S...........      1,620
     84,463,000    Turkiye Is Bankasi, Class C......................      3,679
     42,354,601    Vestel Elektronik Sanayi Ve Ticaret A.S..........      4,031
    522,796,664    Yapi Ve Kredi Bankasi A.S........................      9,670
                                                                      ---------
                                                                         32,728
                                                                      ---------
  ZIMBABWE (0.1%)
        867,999    Delta Corp. Ltd..................................        221
        917,040    Meikles Africa Ltd. ADR..........................        734
                                                                      ---------
                                                                            955
                                                                      ---------
  OTHER (0.1%)
     (g)100,130    Morgan Stanley Africa Investment Fund, Inc.......        939
                                                                      ---------
TOTAL COMMON STOCKS (Cost $899,504).................................    845,752
                                                                      ---------
PREFERRED STOCKS (0.0%)
  COLOMBIA (0.0%)
        103,207    Bancolombia (Cost $617)..........................        123
                                                                      ---------
</TABLE>

<TABLE>
<CAPTION>
    NO. OF
   WARRANTS
<C>                <S>                                                <C>
- ---------------

WARRANTS (0.0%)
  THAILAND (0.0%)
      1,020,633    Siam Commercial Bank PCL (Foreign) (Cost $0).....         --
                                                                      ---------
</TABLE>

<TABLE>
<CAPTION>
    NO. OF                                                              VALUE
     UNITS                                                              (000)
<C>                <S>                                                <C>
- -------------------------------------------------------------------------------

UNITS (1.4%)
  MEXICO (1.3%)
      3,796,449    Fomento Economico Mexicano.......................  $  11,611
                                                                      ---------
  RUSSIA (0.1%)
          1,637    Storyfirst Communications, Inc., First Section,
                     Tranche I, 25.00%, 3/31/99.....................        395
             96    Storyfirst Communications, Inc., Second Section,
                     Tranche I, 25.00%, 3/31/99.....................         23
            421    Storyfirst Communications, Inc., Tranche II,
                     26.00%, 3/31/99................................        102
            562    Storyfirst Communications, Inc., Tranche IV,
                     28.00%, 3/31/99................................        136
            654    Storyfirst Communications, Inc., Tranche V,
                     29.00%, 3/31/99................................        158
            550    Storyfirst Convertible Bond, Tranche VI, 30.00%,
                     3/31/99........................................        133
                                                                      ---------
                                                                            947
                                                                      ---------
TOTAL UNITS (Cost $12,120)..........................................     12,558
                                                                      ---------
</TABLE>

<TABLE>
<CAPTION>
     FACE
    AMOUNT
     (000)
<C>                <S>                                                <C>
- ---------------

FIXED INCOME SECURITIES (0.4%)
  RUSSIA (0.4%)
         21,883    Svyaz Finance, 17.00%, 8/11/99 (Cost $21,883)....      3,326
                                                                      ---------
CONVERTIBLE DEBENTURES (0.0%)
  INDIA (0.0%)
  INR       336    DCM Shriram Industries Ltd., 7.50%, 2/12/02 (Cost
                     $473)..........................................        138
                                                                      ---------
NON-CONVERTIBLE DEBENTURES (0.2%)
  INDIA (0.2%)
            341    DCM Shriram Industries Ltd., (Floating Rate),
                     9.90%, 2/21/02.................................        187
            700    Saurashtra Cement & Chemicals Ltd., 18.00%,
                     11/27/98.......................................      1,541
                                                                      ---------
TOTAL NON-CONVERTIBLE DEBENTURES (Cost $2,864)......................      1,728
                                                                      ---------
TOTAL FOREIGN SECURITIES (98.3%) (Cost $937,461)....................    863,625
                                                                      ---------
</TABLE>

<TABLE>
<C>                <S>                                                <C>
SHORT-TERM INVESTMENTS (0.1%)
  REPURCHASE AGREEMENT (0.1%)
            797    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                     4/01/99, to be repurchased at $797,
                     collateralized by U.S. Treasury Bonds, 6.625%,
                     due 2/15/27, valued at $803 (Cost $797)........        797
                                                                      ---------
FOREIGN CURRENCY (2.2%)
  BRL       468    Brazilian Real...................................        273
  INR    33,718    Indian Rupee.....................................        795
 IDR    487,497    Indonesian Rupiah................................         56
</TABLE>

- --------------------------------------------------------------------------------
Emerging Markets Portfolio

                                       28
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING MARKETS PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
     FACE
    AMOUNT                                                              VALUE
     (000)                                                              (000)
- -------------------------------------------------------------------------------
<C>                <S>                                                <C>
</TABLE>

FOREIGN CURRENCY (CONT.)
<TABLE>
<C>                <S>                                                <C>
  MYR    62,931    Malaysian Ringgit................................  $  16,561
  MXP     4,737    Mexican Peso.....................................        498
  PHP    14,066    Philippine Peso..................................        363
   KRW   35,709    South Korean Won.................................         29
  LKR         2    Sri Lankan Rupee.................................         --
   TWD   14,795    Taiwan Dollar....................................        446
 TRL 12,132,646    Turkish Lira.....................................         32
   ZWD    3,455    Zimbabwe Dollars.................................         91
                                                                      ---------
TOTAL FOREIGN CURRENCY (Cost $16,519)...............................     19,144
                                                                      ---------
TOTAL INVESTMENTS (100.6%) (Cost $954,777)..........................    883,566
                                                                      ---------
</TABLE>

<TABLE>
<S>                                                                    <C>
OTHER ASSETS AND LIABILITIES (-0.6%)
  Other Assets.......................................................    63,532
  Liabilities........................................................   (68,967)
                                                                       --------
                                                                         (5,435)
                                                                       --------
NET ASSETS (100%)....................................................  $878,131
                                                                       --------
                                                                       --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................   $870,673
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 81,655,315 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $10.66
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $7,458
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 699,120 outstanding $0.001 par
  value shares (authorized 500,000,000 shares)................     $10.67
                                                                ---------
                                                                ---------
</TABLE>

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

(e)   --  144A Security -- Certain conditions for public sale may exist
(g)   --  The fund is advised by an affiliate
ADR   --  American Depositary Receipt
CPO   --  Certificate of Participation
GDR   --  Global Depositary Receipt
PCL   --  Public Company Limited
Floating Rate Security -- Interest rate changes on these instruments are based
on changes in a designated base rate. The rates shown are those in effect on
March 31, 1999.
Foreign -- Prior governmental approval for foreign investments may be required
under certain circumstances.

- --------------------------------------------------------------------------------
                                                      Emerging Markets Portfolio

                                       29
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EUROPEAN EQUITY PORTFOLIO

The investment objective of the European Equity Portfolio is to seek long-term
capital appreciation through investment in equity securities of European
issuers. Equity securities for this purpose include stocks and stock equivalents
such as securities convertible into common and preferred stocks and securities
having equity characteristics, such as rights and warrants to purchase common
stock.

PERFORMANCE COMPARED TO THE MORGAN STANLEY
CAPITAL INTERNATIONAL (MSCI) EUROPE INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                           TOTAL RETURNS(2)
                          --------------------------------------------------
                                                                  AVERAGE
                                                    AVERAGE        ANNUAL
                                         ONE         ANNUAL        SINCE
                             YTD         YEAR      FIVE YEARS    INCEPTION
                          ----------  ----------  ------------  ------------
<S>                       <C>         <C>         <C>           <C>
PORTFOLIO -- CLASS A....      -3.75%     -12.11%       11.44%        15.74%
PORTFOLIO -- CLASS B....      -3.88      -12.44          N/A         12.69
INDEX -- CLASS A........      -2.11        4.58        18.96         18.90
INDEX -- CLASS B........      -2.11        4.58          N/A         21.37
</TABLE>

1. The MSCI Europe Index is an unmanaged market value weighted index of common
   stocks listed on the stock exchanges of countries in Europe (includes
   dividends).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED ARE MEASURED BY THE MSCI EUROPE INDEX AND ARE FOR INFORMATIONAL
PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF THE PORTFOLIO'S
FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF FUTURE
PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT AN
INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR ORIGINAL
COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK CONSIDERATIONS
ASSOCIATED WITH INTERNATIONAL INVESTING.

The approach taken in selecting investments for the Portfolio is oriented to
individual stock selection and is value driven. The initial step in identifying
attractive undervalued securities is the screening of European databases. Stocks
are screened for undervaluation on two primary criteria, cash flow and book
value, and three secondary criteria, earnings, sales and yield. Once stocks have
been selected from this screening process, they are put through detailed
fundamental analysis. Important areas covered during this in-depth study include
the companies' balance sheets and cash flow, franchise, products, management and
the strategic value of the assets.

For the three months ended March 31, 1999, the Portfolio had a total return of
- -3.75% for the Class A shares and -3.88% for the Class B shares compared to a
total return of -2.11% for the Morgan Stanley Capital International (MSCI)
Europe Index (the "Index"). For the one-year period ended March 31, 1999, the
Portfolio had a total return of -12.11% for the Class A shares and -12.44% for
the Class B shares compared to 4.58% for the Index. For the five-year period
ended March 31, 1999, the average annual total return of Class A shares was
11.44% compared to 18.96% for the Index. From inception on April 2, 1993 through
March 31, 1999, the average annual total return of Class A shares was 15.74%
compared to 18.90% for the Index. From inception on January 2, 1996 through
March 31, 1999, the average annual total return of Class B shares was 12.69%
compared to 21.37% for the Index.

The Portfolio underperformed the Index in the first quarter of 1999. This was
disappointing, as the Portfolio had been outperforming for the quarter to-date
in early March. The Portfolio's overweighting to small and mid cap stocks
constrained performance for the quarter despite contributing positively in
February. As in the U.S., investors have focussed attention on the largest, most
liquid stocks in the European Index. The largest 20 stocks in the Index now
account for 30% of the Index by weight illustrating the degree of concentration.
Growth and financial sectors now represent 67% of the European large cap
universe, up from 40% at the 1980-81 interest rate peak. Valuations have risen
strongly in this group, limiting our participation.

Although the Portfolio is neutral weight in banks overall, the largest banks in
Europe have been heavily underweighted, in particular the U.K. banks, on
valuation grounds. Zero weights in Index heavyweights such as HSBC (+29%),
Barclays (+36%) and Credit Suisse (+19%) were a negative. Large declines in some
of the Portfolio's smaller regional banks hurt performance, for example Sweden's
Svenska Handelsbanken (-17%) and Nordbanken (-8%), Denmark's Unidanmark (-22%),
and Germany's Bayer Hypo-Veriensbank (-24%, on concerns about the merged bank's
real estate exposure).

The Portfolio's overweight to food & household goods (10% versus 4% in the
Index) also contributed to the underperformance as the sector fell 17% in the
first quarter of 1999. As prospects brightened for a rate cut in Europe,
investors moved away from consumer defensive staple companies in order to add
cyclical and credit sensitive exposure. Negatives

- --------------------------------------------------------------------------------
European Equity Portfolio

                                       30
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EUROPEAN EQUITY PORTFOLIO (CONT.)

for the Portfolio in this sector included Sudzucker (-22%), Nestle (-17%),
Reckitt & Colman (-16%) and Greencore (-24%).

The Portfolio's overweighting in machinery & engineering was another negative.
Small stocks Halma (U.K., -26%) and Rauma (Finland, -16%) were notably weak in
this sector. Zero weighting to Finland's Nokia (+32%), on valuation grounds,
also proved a negative as the company disclosed improved results from its mobile
phone business.

On a positive note, the Portfolio's underweight to insurance was rewarded as the
large European insurers weakened significantly (Aegon -26%, Alliance -17%) in
line with the rise in bond yields since the start of the year. The Portfolio's
overweight and strong stock selection in advertising and media was a positive.
WPP (+42%) rose on improved prospects for U.S. ad spending. U.K. media buyer
Aegis (+50%), top London radio station Capital Radio (+14%) and Italy's dominant
TV operator Mediaset (+16%) all made strong contributions in the quarter. The
Portfolio's overweight to Telecom Italia (+24%) was a positive following
Olivetti's hostile bid for the company in the quarter. Richemont (+18%) made a
strong contribution following the announced merger of its majority owned
subsidiary Rothmans International with the U.K.'s BAT in January.

The emergence over the last twelve months of a European "Nifty Fifty" phenomena,
along the lines of the U.S. experience of narrowing leadership among the largest
Index stocks, has been the factor most responsible for the poor relative
performance of our disciplined value strategy in Europe. Europe's slowing
economic growth has favored stocks with demonstrated capabilities in generating
top-line sales growth or cost reduction from merger synergies. Not only has
value been out of favor, but mega-cap stocks (companies with a market
capitalization of over $20 billion) have beaten all other market cap segments
following the liquidity boom in European equity markets.

Timing a return to favor of value investing has been dangerous. Certainly we
know the valuation gap between mega-cap stocks and small/mid size stocks in
Europe is at an historical high. The Portfolio has exploited this gap by
overweighting quality small and mid cap stocks. But companies face real
challenges in today's operating environment -- walking the tightrope of falling
inflation and outright deflation. In recognition of these challenges we have
been opportunistically reducing our small and mid cap exposure in the Portfolio
in favor of large caps demonstrating attractive relative valuation. Mega-cap
stocks offer little value. Small and mid cap stocks now represent less than 30%
of the Portfolio versus an Index weight in the segment of 10%.

It is likely that macro events in the quarter have moved us closer to the point
where value may start to perform better. The resignation of Oskar Lafontaine,
the German Minister of Finance and stalwart of the left wing of the SPD was an
important turning point for Europe. The euro-zone economy has showed further
signs of slowing with very subdued inflation, dipping into near deflation in
Germany. And yet the European Central Bank (ECB) was previously loathe to reduce
interest rates not wishing to appear politically motivated (Lafontaine had been
vociferous in his calls for rate cuts). With Lafontaine out of the way, the ECB
is more likely to lower interest rates and indeed, since quarter end the ECB has
announced a 0.5% cut. This may lead to a more stable outlook for the European
economy which, in turn, would benefit our value discipline.

The narrow leadership currently dominating the European indices is a result of
abundant liquidity and a yearning for "growth". Multiples placed on the earnings
of large/mega-cap companies have risen reflecting their increased liquidity,
perceived higher growth prospects and restructuring/consolidation potential.
Mega-cap performance has also benefited from a sector mix shift toward growth
and financial sectors which have benefited from lower interest rates. With the
valuation premium of this narrow leadership currently at its widest, there is
little room for disappointment from the ranks of healthcare, technology and
telecommunications. We remain committed to our disciplined bottom-up value
philosophy and await signs of a deterioration in the Portfolio Fundamentals
currently supporting growth stocks.

Margaret Naylor
PORTFOLIO MANAGER

Alastair Anderson
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
                                                       European Equity Portfolio

                                       31
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EUROPEAN EQUITY PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
  SHARES                                                            VALUE
   (000)                                                            (000)
<C>            <S>                                                <C>
- ---------------------------------------------------------------------------

COMMON STOCKS (93.7%)
  BELGIUM (1.1%)
         55    GB INNO AFV......................................  $       2
     39,500    GB INNO BM.......................................      1,557
                                                                  ---------
                                                                      1,559
                                                                  ---------
  DENMARK (1.0%)
     21,610    Unidanmark A/S, Class A..........................      1,478
                                                                  ---------
  FINLAND (4.3%)
     21,740    KCI Konecranes International.....................        752
     15,645    Kone Oyj, Class B................................      1,650
    404,650    Merita Ltd., Class A.............................      2,170
     49,195    Sampo Insurance Co., plc, Class A................      1,543
      1,024    The Rauma Group..................................         12
                                                                  ---------
                                                                      6,127
                                                                  ---------
  FRANCE (13.3%)
     80,300    CNP Assurances...................................      2,114
     15,820    Cie de Saint Gobain..............................      2,515
     56,400    Cie Generale des Establissements
                 Michelin, Class B (Registered).................      2,534
     16,710    Elf Aquitaine....................................      2,273
      7,790    Groupe Danone....................................      1,964
     12,330    Pernod Ricard....................................        785
     35,850    Rhone-Poulenc....................................      1,624
     37,960    Schneider........................................      2,104
     26,620    Total, Class B...................................      3,284
                                                                  ---------
                                                                     19,197
                                                                  ---------
  GERMANY (10.4%)
        500    Adidas AG........................................         45
     61,200    BASF AG..........................................      2,230
     46,540    Bayerische Vereinsbank AG........................      2,798
      4,709    Bewag Aktiengesellschaft.........................         97
     38,758    Hoechst AG.......................................      1,651
     10,777    Philipp Holzmann AG..............................      1,387
        800    Schering AG......................................         91
      4,895    Suedzucker AG....................................      1,720
     30,580    VEBA AG..........................................      1,612
      2,110    Viag AG..........................................      1,157
     31,830    Volkswagen AG....................................      2,120
                                                                  ---------
                                                                     14,908
                                                                  ---------
  IRELAND (1.4%)
     98,773    Bank of Ireland..................................      2,072
                                                                  ---------
  ITALY (7.3%)
     21,085    Banca Popolare Di Bergamo S.p.A. ................        503
    244,500    Marzotto (Gaetano) & Figli S.p.A. ...............      2,076
    209,700    Mediaset S.p.A. .................................      1,975
    285,230    Telecom Italia S.p.A. ...........................      3,035
    498,905    Telecom Italia S.p.A. (RNC)......................      2,967
                                                                  ---------
                                                                     10,556
                                                                  ---------

<CAPTION>

  SHARES                                                            VALUE
   (000)                                                            (000)
<C>            <S>                                                <C>
- ---------------------------------------------------------------------------

  NETHERLANDS (5.7%)
     60,650    Akzo Nobel N.V...................................  $   2,249
     62,186    ING Groep N.V....................................      3,433
     30,300    Philips Electronics N.V..........................      2,472
                                                                  ---------
                                                                      8,154
                                                                  ---------
  NORWAY (1.4%)
    105,290    Sparebanken......................................      2,046
                                                                  ---------
  PORTUGAL (1.4%)
    100,150    Electricidade de Portugal........................      1,980
                                                                  ---------
  SPAIN (5.0%)
     60,300    Banco Bilbao Vizcaya (Registered)................        900
     48,000    Banco Santander S.A. ............................        986
     66,250    Endesa...........................................      1,675
    102,400    Iberdrola........................................      1,519
     48,303    Telefonica.......................................      2,052
                                                                  ---------
                                                                      7,132
                                                                  ---------
  SWEDEN (6.3%)
     69,800    Autoliv, Inc.....................................      2,662
    424,700    Nordbanken Holding AB............................      2,432
     98,600    Svedala Intrustri AB.............................      1,724
     62,500    Svenska Handelsbanken, Class A...................      2,181
                                                                  ---------
                                                                      8,999
                                                                  ---------
  SWITZERLAND (10.5%)
      2,925    Cie Financiere Richemont AG, Class A.............      4,873
      2,410    Holderbank Financiere Glarus AG, Class B
                 (Bearer).......................................      2,701
      2,475    Nestle (Registered)..............................      4,507
        798    Schindler Holding AG (Registered)................      1,349
      4,250    Swisscom AG......................................      1,664
        190    Union Bank of Switzerland AG (Registered)........         60
                                                                  ---------
                                                                     15,154
                                                                  ---------
  UNITED KINGDOM (24.6%)
    729,800    Aegis Group plc..................................      1,609
    170,200    Allied Domecq plc................................      1,268
    123,700    Allied Zurich plc................................      1,669
</TABLE>

<TABLE>
<C>            <S>                                                <C>
    302,718    BG plc...........................................      1,780
     85,800    BOC Group plc....................................      1,198
    136,310    Bank of Scotland.................................      1,812
    114,100    British Telecommunications plc...................      1,864
    165,010    Burmah Castrol plc...............................      2,523
    203,800    Capital Radio plc................................      2,239
    624,700    Devro plc........................................      1,443
    154,283    Diageo plc.......................................      1,735
    199,480    Great Universal Stores plc.......................      2,175
    848,000    Halma plc........................................      1,274
    234,400    Imperial Tobacco Group plc.......................      2,425
    340,900    Morgan Crucible Co...............................      1,206
    256,282    Reckitt & Colman plc.............................      2,776
    185,900    RMC Group plc....................................      2,518
</TABLE>

- --------------------------------------------------------------------------------
European Equity Portfolio

                                       32
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EUROPEAN EQUITY PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
  SHARES                                                            VALUE
   (000)                                                            (000)
- ---------------------------------------------------------------------------
<C>            <S>                                                <C>
</TABLE>

  UNITED KINGDOM (CONT.)
<TABLE>
<C>            <S>                                                <C>
    193,261    Royal & Sun Alliance Insurance Group plc.........  $   1,825
    239,800    WPP Group plc....................................      2,080
                                                                  ---------
                                                                     35,419
                                                                  ---------
TOTAL COMMON STOCKS (Cost $123,938).............................    134,781
                                                                  ---------
PREFERRED STOCKS (2.1%)
  GERMANY (2.1%)
      5,780    Dyckerhoff AG....................................      1,556
      4,623    Fresenius AG.....................................        915
      6,872    Henkel KGaA-Vorzug...............................        502
                                                                  ---------
TOTAL PREFERRED STOCKS (Cost $2,859)............................      2,973
                                                                  ---------
TOTAL FOREIGN SECURITIES (95.8%) (Cost $126,797)................    137,754
                                                                  ---------
</TABLE>

<TABLE>
<CAPTION>
   FACE
  AMOUNT
   (000)
<C>            <S>                                                <C>
- -----------

SHORT-TERM INVESTMENT (3.0%)
  REPURCHASE AGREEMENT (3.0%)
$     4,328    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                 4/01/99, to be repurchased at $4,329,
                 collateralized by U.S. Treasury Bonds, 7.125%
                 due 2/15/23, valued at $4,362 (Cost $4,328)....      4,328
                                                                  ---------
</TABLE>

<TABLE>
<C>            <S>                                                <C>
FOREIGN CURRENCY (0.1%)
  GBP     6    British Pound....................................         10
  DKK   243    Danish Krone.....................................         35
  EUR   117    European Monetary Unit...........................        127
                                                                  ---------
TOTAL FOREIGN CURRENCY (Cost $171)..............................        172
                                                                  ---------
</TABLE>

<TABLE>
<CAPTION>
                                                                VALUE
                                                                (000)
<S>                                                           <C>
- ------------------------------------------------------------------------

TOTAL INVESTMENTS (98.9%) (Cost $131,296)...................  $  142,254
                                                              ----------
OTHER ASSETS AND LIABILITIES (1.1%)
  Other Assets..............................................       8,654
  Liabilities...............................................      (7,102)
                                                              ----------
                                                                   1,552
                                                              ----------
NET ASSETS (100%)...........................................  $  143,806
                                                              ----------
                                                              ----------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................   $139,939
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 9,233,480 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $15.16
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $3,867
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 255,578 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $15.13
                                                                ---------
                                                                ---------
</TABLE>

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

RNC   --  Non-Convertible Savings Shares

- --------------------------------------------------------------------------------
                                                       European Equity Portfolio

                                       33
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EUROPEAN REAL ESTATE PORTFOLIO

The investment objective of the European Real Estate Portfolio is to provide
current income and long-term capital appreciation by investing primarily in
equity securities of companies in the European real estate industry.

PERFORMANCE COMPARED TO THE GPR GENERAL
REAL ESTATE SECURITIES INDEX -- EUROPE(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                    TOTAL RETURNS(2)
                       ------------------------------------------
                                                 AVERAGE ANNUAL
                          YTD       ONE YEAR     SINCE INCEPTION
                       ----------  -----------  -----------------
<S>                    <C>         <C>          <C>
PORTFOLIO -- CLASS
 A(3)................      -1.46%      -11.23%         -1.11%
PORTFOLIO -- CLASS
 B(3)................      -1.56       -11.37          -1.30
INDEX................       1.07       -11.02           0.46
</TABLE>

1. The GPR General Real Estate Securities Index -- Europe is a European market
   capitalization weighted index of listed property/real estate securities
   measuring total return.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

3. The Portfolio commenced operations on October 1, 1997.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED IN THIS OVERVIEW ARE FOR INFORMATIONAL PURPOSES ONLY AND SHOULD
NOT BE CONSTRUED AS A GUARANTEE OF THE PORTFOLIO'S FUTURE PERFORMANCE. PAST
PERFORMANCE SHOWN IS NOT PREDICTIVE OF FUTURE PERFORMANCE. INVESTMENT RETURN AND
PRINCIPAL VALUE WILL FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN REDEEMED, MAY
BE WORTH MORE OR LESS THAN THEIR ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A
DESCRIPTION OF CERTAIN RISK CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL
INVESTING.

For the three months ended March 31, 1999, the Portfolio had a total return of
- -1.46% for the Class A shares and -1.56% for the Class B shares compared to
1.07% for the GPR General Real Estate Securities Index -- Europe (the "Index").
For the one-year period ended March 31, 1999, the Portfolio had a total return
of -11.23% for the Class A shares and -11.37% for the Class B shares compared to
- -11.02% for the Index. From inception on October 1, 1997 through March 31, 1999,
the Portfolio had an average annual total return of -1.11% for Class A shares
and -1.30% for Class B shares compared to 0.46% for the Index.

The first quarter of 1999 saw a drastically different outcome from 1998. In
1998, the European real estate securities markets focused on the inauguration of
the single currency. As the Euro drew near, the single currency countries such
as France, Belgium, Italy and Spain significantly outperformed the non-Euro
property markets of Sweden, Norway and the United Kingdom. Once the currency
arrived, and global economic concerns persisted, the indirect property markets
reexamined their thinking. The growth in Euroland continued to look positive,
but significantly slowed. Especially when the anticipated adrenaline shot from
the European Central Bank (ECB) failed to materialize due to currency concerns.
As slower Euro growth expectations were being accepted, property investors
recognized that Armageddon had not hit the U.K. On the contrary, many economists
expect the economy to actually avoid recession in 1999, followed by growth in
2000. The result of this change in thinking was a flip in performance, with the
non-Euro markets leading the pack this time.

Going forward, we see opportunities both in and out of Euroland. Economic
growth, or the demand for space, is clearly the number one concern facing the
industry. This being said, in a number of markets vacancies are low, available
quality space is limited, new supply is marginal, and demand is growing, only at
a slower rate than previously expected. We believe these issues will drive
rental growth marginally better than inflation over the upcoming 12 months.
Meanwhile, it is our impression that the sharp decline in interest rates last
year has not yet fully fed through property yields. This should be corrected in
the second half of 1999 as global fears subside, central banks lower rates
further, and international investors return to buying. Therefore, we remain
optimistic the property markets will continue along the recovery path of early
1998.

The United Kingdom property shares rebounded significantly from their 1998
dismal performance. The market's 9.8% first quarter U.S. dollar return
outperformed the Index by 8.7%. The first quarter returns were driven by the
realization that the pessimistic downgrade by the financial community following
the Asian meltdown last summer was overblown. For example, the Net Asset Value
(NAV) for Wates City of London, a pure London City office play, was downgraded
by 6% in response to Asia. However, the year-end valuation outperformed this
revalued estimate by 4%. In other words, the market grew by less than originally
anticipated, but faster than the revalued post-crisis estimates suggested.
Furthermore, takeover bids and public to private speculation, in names such as
Greycoat and Chesterfield, confirms our thesis that severe discounts to NAV
should not remain in the market long-term. Going forward, we believe the U.K.
continues to

- --------------------------------------------------------------------------------
European Real Estate Portfolio

                                       34
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EUROPEAN REAL ESTATE PORTFOLIO (CONT.)

hold some upside derived from the panic selling of the Summer. Upward-only
rental revisions provide a degree of protection for current valuations, while
further Bank of England rate cuts offer positive surprises on the yield front.
We remain slightly underweight the country overall, but could go to market at
the right pricing levels. Our focus remains on the out-of-town retail and
West-end office sectors. The Canary Wharf Group flotation should maintain the
concerns over new space impacting the city office market, although some stocks
are sufficiently discounted to warrant a holding. The industrial sector looks
interesting, but we are not ready to move forward until the recent price
appreciation fades away from particular names.

The French market followed the U.K.'s lead and performed exactly opposite to
their 1998 returns. Rather than offering a strong outperformance, the property
stocks fell -9.2% during the quarter, trailing the Index's -1.1%, and the CAC
40's -1.1% returns, in U.S. dollars. We believe this fallback will be
short-lived. ECB rate cuts, and interest from the international opportunity
funds should push property yields down by at least 25 basis points this year.
Office vacancies in the city and La Defense regions remain below 4%, while
recent lettings attest to the existence of upward pressure on rents. At the same
time, the market's shortage of quality modern space will not be corrected in the
near term due to a lack of significant new supply in the city. However, there
are a few concerns regarding demand. In February, unemployment rose for the
first time since June 1997, albeit from a three-and-a-half year low. While these
jobs are primarily manufacturing positions, where high inventory stocks are in
need of a correction, rather than the office located service sector, there is
some cause for alarm. At the same time, we are seeing confidence surveys for
both businesses and consumers falling. However, we believe these declining
trends will encourage a more aggressive ECB, notwithstanding current Euro-Dollar
exchange rates and the oil recovery impact on inflation. We are cautious in the
near term with a market weight, but expect the French commercial sector to shine
over the next 12-18 months.

Not to be outdone, Sweden also turned their -12.5% 1998 return into a 2.4%
positive U.S. dollar performance. The sole driver here was consolidation.
Balder's bid for Prifast, and IVG's proposal for Asticus within 2 weeks of each
other, caused a flurry of speculation of who would be next. The premiums offered
for Prifast and Asticus pulled the remainder of the sector to higher levels. We
believe these transactions confirm the Swedish indirect property market is
undervalued. An investor can buy similar real estate cheaper through the public
market than acquiring bricks and mortar directly. From a top-down perspective,
once again demand is the concern. Growth estimates in Sweden have fallen from
2.8% in 1998 to 2.0% in 1999, although still some of the strongest in Europe.
This decline is driven by lower expectations for export growth, but healthy
consumer demand. However, these figures may be helped by the Riksbank's recent
rate drop to 2.9%, 10 basis points below the current ECB 3.0% rate. Further
declines could be expected if inflation estimates remain below the Bank's
two-year 2% horizon. Thus, we remain overweight the sector, encouraged by
consumer demand, economic growth relative to Europe, and continued price/NAV
discounts. But we are taking some profits from the recent run.

Continuing with the quarter's theme of reversed fortunes, Norway and Finland,
who lost ground in 1998, posted positive numbers in 1999, while Denmark slid
back. The Norwegian property market, Europe's strongest market this quarter,
grew by 14.1% while Finland's Sponda fell by -6.1% in U.S. dollar terms.
Denmark, the only Nordic property market to outperform the Index in 1998, fell
- -12.7% during the quarter, underperforming the Index by 13.8% in U.S. dollars.
The Norwegian rise is directly correlated with the recent rebound in oil prices,
but we believe better opportunities exist within Euroland and are lowering our
overweight stance closer to a neutral level. In Finland, the slight price
appreciation tells us very little. Going forward, we hope to capitalize on the
Finnish growth by opportunistically increasing our weighting to this market. We
also anticipate additional activity in the market with the rumored flotation of
a large bank portfolio. The story in Denmark is a little different. The market
dominated by one small company had a difficult quarter. The bridge with Malmo is
proceeding, oversupply is not yet a concern, and domestic demand faces the same
issues as the rest of Europe. This being said, we are slightly reducing our
overweight position when pricing allows. Even though we like the market from a
top-down view,

- --------------------------------------------------------------------------------
                                                  European Real Estate Portfolio

                                       35
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EUROPEAN REAL ESTATE PORTFOLIO (CONT.)
and the discount to NAV is favorable, we are uncomfortable with such a large
overweight in an illiquid name.

Once Euroland's ugly stepchild, the Dutch market performed as the darling during
the quarter. Led by the restructuring of a few large internationals and
impressive domestic performance, Holland's property shares returned the second
strongest numbers among the 11 Euro countries behind Ireland, although the
market still fell back -4.1% in U.S. dollars. We expect to see additional rental
growth in 1999, but believe the share premiums are recognizing this potential.
Furthermore, the 300,000 - 400,000 square meters of space under construction
and/or planning should provide a top to the rents and a bottom to investment
yields. The Netherlands, Germany and U.K. are the only countries to offer
supply-side concerns in Europe at this time. As a result, we will remain
underweight the Dutch internationals, and could sell shares if the price
appreciation continues.

As the run-up to the single currency came and went, so did the capital's real
estate performance. The Belgian property shares market returned a disappointing
- -8.2% this quarter. This European Community dominated market should continue to
underperform going forward. With one large tenant, landlords have difficulty
raising rents. Furthermore, international investment interest is far below the
rest of Europe. Brussels cannot offer the large market rebound of Paris, or the
remaining one-time bump due to interest rate convergence in Spain, Italy or
Portugal. Thus, we remain underweight the market and expect it to chug along at
a stable, unexciting pace.

Spain returned a significant percentage of its 1998 returns, falling -14.7%, in
U.S. dollars, over the past 3 months. This decline was in part a result of Latin
American concerns, as well as Spanish rental increases falling short of
extraordinary expectations. Going-forward, we expect to see a combination of
good economic growth, insufficient quality office space and limited construction
completions to maintain relatively strong rental growth in both Madrid and
Barcelona. International investors are continuing to bid-up the price for
quality retail space, nearing a top we expect. Finally, the homebuilding
business fell in-line with expectations as lower interest rates are opening the
pent-up demand for low- and medium-cost housing. We expect to see 2-4 more
strong years for the homebuilding segment in Spain. We are increasing our
Spanish exposure based on the recent price weakness, looking for existing
commercial exposure, but not excited about managements who are buying
aggressively in this market.

Italy and Portugal each trailed the European Index by -8.7% and -13.9% in U.S.
dollars this quarter, respectively. Even though we like both markets from a
top-down perspective, the limited investment opportunities prevent us from
taking an aggressive overweight stance. We have added Portuguese retail exposure
through Sonae Imobiliaria on price weakness.

The closed end property companies in Germany, Switzerland and Austria were mixed
this quarter, returning -13.0%, -4.3%, and -8.7%, respectively, in dollar terms.
We are continuing to underweight these countries and their open-end fund
structure. Along with the inefficiencies caused by the structure, we fear the
development plans in these markets are too aggressive for the space requirements
in the near to medium term. We do not foresee adding to these positions anytime
soon, but could invest with significant price deterioration.

Theodore R. Bigman
PORTFOLIO MANAGER

Daniel A. Policy
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
European Real Estate Portfolio

                                       36
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EUROPEAN REAL ESTATE PORTFOLIO
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                 VALUE
 SHARES                                                          (000)
<C>          <S>                                                <C>
- ------------------------------------------------------------------------

COMMON STOCKS (97.5%)
  DENMARK (1.8%)
    8,080    EjendomsSelskabet Norden A/S.....................  $    379
                                                                --------
  FINLAND (2.3%)
   91,840    Sponda Oyj.......................................       501
                                                                --------
  FRANCE (26.3%)
   15,338    Klepierre........................................     1,416
    3,710    Silic............................................       621
    7,050    Simco (RFD)......................................       618
    7,360    Societe Fonciere Lyonnaise.......................       979
   16,116    Sophia...........................................       605
   11,232    Unibail..........................................     1,409
                                                                --------
                                                                   5,648
                                                                --------
  IRELAND (4.6%)
2,796,410    Dunloe Ewart plc ................................       998
                                                                --------
  ITALY (2.4%)
  503,650    Immobiliaria Urbis...............................       513
                                                                --------
  NETHERLANDS (1.6%)
   14,800    Rodamco N.V. ....................................       344
                                                                --------
  NORWAY (1.4%)
   46,120    Avantor ASA......................................       293
                                                                --------
  SPAIN (6.0%)
   63,178    Prima Immobiliaria...............................       478
   76,630    Vallehermoso.....................................       820
                                                                --------
                                                                   1,298
                                                                --------
  SWEDEN (10.0%)
   49,000    Castellum AB.....................................       457
   86,400    Diligentia AB....................................       684
   28,760    Fastighets AB Tornet.............................       393
  101,290    Piren AB.........................................       629
        1    Platzer Bygg AB, Class B.........................        --
                                                                --------
                                                                   2,163
                                                                --------
  UNITED KINGDOM (41.1%)
  172,360    British Land Co. plc.............................     1,481
  129,800    Buford Holdings plc..............................       231
  163,930    Capital Shopping Centers plc.....................     1,006
   84,590    Freeport Leisure plc.............................       695
  250,480    Grantchester Holdings plc........................       749
  199,880    Great Portland Estates plc.......................       635
  135,760    Land Securities plc..............................     1,799
  135,540    MEPC plc ........................................       946
  280,644    NHP plc .........................................       816
  356,560    Wates City Of London Properties plc..............       484
                                                                --------
                                                                   8,842
                                                                --------
TOTAL COMMON STOCKS (Cost $21,393)............................    20,979
                                                                --------
</TABLE>

<TABLE>
<CAPTION>
 NO. OF                                                          VALUE
WARRANTS                                                         (000)
<C>          <S>                                                <C>
- ------------------------------------------------------------------------

WARRANTS (0.0%)
  FRANCE (0.0%)
    6,800    Societe Fonciere Lyonnaise (Cost $0).............         5
                                                                --------
TOTAL FOREIGN SECURITIES (97.5%) (Cost $21,393)...............    20,984
                                                                --------
</TABLE>

<TABLE>
<CAPTION>
  FACE
 AMOUNT
  (000)
<C>          <S>                                                <C>
- ---------

SHORT-TERM INVESTMENT (2.1%)
  REPURCHASE AGREEMENT (2.1%)
$     458    Chase Securities, Inc. 4.65%, dated 3/31/99, due
               4/01/99, to be repurchased at $458,
               collateralized by U.S. Treasury Bonds, 10.375%,
               due 11/15/12, valued at $472 (Cost $458).......       458
                                                                --------
FOREIGN CURRENCY (0.1%)
   EMU 14    European Monetary Unit (Cost $16)................        15
                                                                --------
TOTAL INVESTMENTS (99.7%) (Cost $21,867)......................    21,457
                                                                --------
</TABLE>

<TABLE>
<S>                                                             <C>
OTHER ASSETS AND LIABILITIES (0.3%)
  Other Assets................................................     1,441
  Liabilities.................................................    (1,386)
                                                                --------
                                                                      55
                                                                --------
NET ASSETS (100%).............................................  $ 21,512
                                                                --------
                                                                --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................    $19,451
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 2,060,122 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $9.44
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $2,061
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 217,827 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $9.46
                                                                ---------
                                                                ---------
</TABLE>

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

RFD   --  Ranked for Dividend

- --------------------------------------------------------------------------------
                                                  European Real Estate Portfolio

                                       37
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
GLOBAL EQUITY PORTFOLIO

The Global Equity Portfolio is managed with the objective of obtaining long-term
capital appreciation by investing in equity securities of issuers throughout the
world, including U.S. issuers. Investments may also be made with discretion in
emerging markets.

For the three months ended March 31, 1999, the Portfolio had a total return of
- -4.00% for the Class A shares and -4.02% for the Class B shares compared to a
total return of 3.57% for the Morgan Stanley Capital International (MSCI) World
Index (the "Index"). For the one-year period ended March 31, 1999, the Portfolio
had a total return of -5.41% for the Class A shares and -5.67% for the Class B
shares compared to 12.64% for the Index. For the five-year period ended March
31, 1999, the Portfolio had a total return of 14.78% for the Class A shares
compared to 16.36% for the Index. From inception on July 15, 1992 through March
31, 1999, the average annual total return of Class A shares was 17.69% compared
to 15.27% for the Index. From inception on January 2, 1996 through March 31,
1999, the average annual total return of Class B shares was 16.68% compared to
17.44% for the Index.

PERFORMANCE COMPARED TO MORGAN STANLEY CAPITAL
INTERNATIONAL (MSCI) WORLD INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                                         TOTAL RETURNS(2)
                                             ----------------------------------------
                                                                             AVERAGE
                                                                AVERAGE      ANNUAL
                                                       ONE       ANNUAL       SINCE
                                              YTD      YEAR    FIVE YEARS   INCEPTION
                                             ------   ------   ----------   ---------
<S>                                          <C>      <C>      <C>          <C>
PORTFOLIO -- CLASS A.......................  -4.00%   -5.41%     14.78%      17.69%
PORTFOLIO -- CLASS B.......................  -4.02    -5.67       N/A        16.68
INDEX -- CLASS A...........................   3.57    12.64      16.36       15.27
INDEX -- CLASS B...........................   3.57    12.64       N/A        17.44
</TABLE>

1. The MSCI World Index is an unmanaged index of common stocks and includes
   securities representative of the market structure of 22 developed market
   countries in North America, Europe, and the Asia/ Pacific region (includes
   dividends).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED IN THIS OVERVIEW ARE FOR INFORMATIONAL PURPOSES ONLY AND SHOULD
NOT BE CONSTRUED AS A GUARANTEE OF THE PORTFOLIO'S FUTURE PERFORMANCE. PAST
PERFORMANCE SHOWN IS NOT PREDICTIVE OF FUTURE PERFORMANCE. INVESTMENT RETURN AND
PRINCIPAL VALUE WILL FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN REDEEMED, MAY
BE WORTH MORE OR LESS THAN THEIR ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A
DESCRIPTION OF CERTAIN RISK CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL
INVESTING.

PERFORMANCE REVIEW

The Portfolio's performance shortfall for the first quarter was explained
primarily by weak performance of global consumer defensive industries (where the
Portfolio is overweighted) such as food, food retailing, household products,
beverages and tobacco. Poor performance of interest sensitive utilities and
insurance, overweighted by the Portfolio, also contributed negatively. The
continued narrow leadership of technology, telecoms and pharmaceuticals also
hurt the Portfolio as it has little exposure, on valuation grounds, to these
sought after growth sectors. Eight of the top ten Index contributors were
technology or telecom related with Microsoft, Cisco and America Online chief
among them. America Online's market value now exceeds both Coca Cola and Philip
Morris.

The Portfolio's largest holding, Philip Morris (-34%), explained one third of
the Portfolio's underperformance in the first quarter of 1999. In March, an
Oregon jury ordered Philip Morris to pay a record $81 million to a smoker's
family adding to concern about the hundreds of individual and group lawsuits
that weren't involved in the tobacco industry's $206 billion settlement with 46
States in November last year. Nestle (-17%) was the second largest negative
contributor in the quarter following the devaluation of the Brazilian real and
the impact that slow growth in Latin America and Asia will have on business in
the short term. Reckitt & Colman (-18%) underperformed over the period due to
its exposure to emerging market economies as well as de-stocking by large
retailers in North America in the fourth quarter last year. U.S. food and drug
retailer American Stores (-11%, announced merger with Albertson's) and Belgian
food retailer GB Inno (-25%) were weak in the quarter. Comsat (-20%) continued
to languish on concerns that Lockheed Martin's bid for the satellite
communications provider will not receive regulatory approval.

Rising bond yields in the first quarter negatively impacted the insurance and
utility sectors where the Portfolio has an overweight position. French re-
insurer Scor (-24%) and U.S. municipal bond insurer MBIA (-12%) were notably
weak. Enhance Financial (-23%), a niche financial re-insurer suffered from the
negative credit downgrade of its principal competitor Cap Re.

- --------------------------------------------------------------------------------
Global Equity Portfolio

                                       38
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
GLOBAL EQUITY PORTFOLIO (CONT.)

On a positive note, NTT (+27%) rose strongly in the quarter, outperforming a
firmer Japanese market on restructuring potential in its core telephone business
and future growth from its mobile business. Tobacco and luxury goods company
Richemont (+18%) benefitted from the announced merger of its majority owned
Rothmans International with BAT in January and prospects of a turnaround in
Asia, an important market for luxury goods. WPP (+42%) was the third largest
contributor in the quarter on improved prospects for U.S. advertising spending.
WPP is also seen as a beneficiary of Proctor and Gamble's decision to
de-consolidate its global advertising spending, as WPP currently does little
business with P&G.

INVESTMENT OUTLOOK

Our biggest concern as disciplined value investors remains the persistent trend
favoring mega-cap growth stocks globally. The U.S. appears increasingly gripped
in a nifty-50 mania reminiscent of the early 70's. Indeed the average price
earnings of the largest 50 S&P 500 stocks is at its highest premium ever
compared to the next 450. The largest 30 stocks in the MSCI World Index comprise
29% of the Index weight (recall the Index has approximately 1500 stocks in it).
All have market capitalization exceeding $100 billion. The average
price/earnings, price/cash flow, and price/book value for this elite group is 57
times, 29 times and 12 times, respectively, according to Factset (America Online
is in the group but we exclude it from the calculation due to its anomalous
valuation ratios of 496 times, 301 times, and 175 times, respectively).
Multiples placed on mega-cap companies have risen -- reflecting increased
liquidity, perceived predictably higher growth prospects and restructuring
potential from mergers and more focussed management. The mega-cap companies also
have a higher representation from growth industries and financials, both of
which have benefited from lower interest rates. The catch is that if we are in
an extended period of low global inflation, the high multiples of mega-cap
companies suggest some risk, as implied real growth rates start to look
stretched. The narrow leadership driving index returns has disguised mediocre
performance from a broader representation of stocks. For example the S&P 400
MidCap Index fell 6.3% in the first quarter of 1999. We do not believe the Mega
cap outperformance is sustainable. However, we have no way of accurately
forecasting a reversal in this trend.

The defensiveness of the Portfolio, particularly our weighting to consumer
staples, telecoms and utilities reflects our concern at the near deflationary
conditions in the major economies outside the U.S. In Japan, we continue to be
frustrated at lackluster attempts to reform the corporate sector and open up the
economy. However, despite ongoing severe structural problems we respect the
massive efforts at stimulation both by monetary and now fiscal measures.
Regardless, Japan remains a stock-pickers market and our attention is squarely
on those companies demonstrating an understanding of shareholder value. This
keeps us in the strong domestic franchises and the exporters. Japanese banks
staged a strong rally in the first quarter of 1999 with Bank Tokyo-Mitsubishi,
Sumitomo and Fuji banks rising an average of 49%. However, the banks and deep
cyclicals remain unattractive due to chronic overinvestment, heavy indebtedness
and mismanagement. Although the pace of change has been frustratingly slow,
change is happening (as reflected in a rising unemployment rate) and western
shareholder value concepts are being introduced. Even the Bank of Japan has
hired American consultants to review its structure. These developments are
encouraging and, coupled with a fiscal package potentially larger than expected,
could lead to a period of better performance. Our current weighting is roughly
neutral, derived from the bottom up opportunities in Japan, and reflects these
slow-burning changes having been underweight for the past ten years.

Europe, as elsewhere, has seen a divergence in performance between its
manufacturing and service sectors. Economic growth has slowed dramatically and
may be troughing. With German Finance Minister Lafontaine now out of the
picture, the European Central Bank (ECB) may see fit to ease interest rates
further, having delayed previously due to the weakness of the euro and
unwillingness to appear politically influenced. Our cyclical exposure remains
limited in Europe to cement/building materials, and autos (Volkswagen).

The U.S. remains the engine of the global economy and U.S. households have
become the consumer of last resort. Despite the maturity of the current business
cycle (longest since WWII), excesses appear limited to the financial markets.
Inflation is at record lows, productivity is high and unemployment low.

- --------------------------------------------------------------------------------
                                                         Global Equity Portfolio

                                       39
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
GLOBAL EQUITY PORTFOLIO (CONT.)
The problem is that the equity market as represented by the mega-cap stocks
appears to have priced this good news in. Ironically, amidst the uncertainty
brought on by continued deflationary pressure and the potential for a wider
conflict in Kosovo, it is the defensiveness of the Portfolio that has
constrained our performance so far in 1999. We would expect it, at some stage,
to pay dividends.

Frances Campion
PORTFOLIO MANAGER

Richard Boon
PORTFOLIO MANAGER

Paul Boyne
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Global Equity Portfolio

                                       40
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

GLOBAL EQUITY PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                      VALUE
  SHARES                                                              (000)
<C>         <S>                                                     <C>
- -----------------------------------------------------------------------------

COMMON STOCKS (96.3%)
  AUSTRALIA (0.7%)
   665,100  CSR Ltd...............................................     $1,443
                                                                    ---------
  BELGIUM (1.5%)
    16,600  Delhaize-Le Lion......................................      1,540
    44,500  G.I.B. Holdings Ltd...................................      1,754
                                                                    ---------
                                                                        3,294
                                                                    ---------
  CANADA (2.3%)
    89,844  BCT.Telus Communications Inc..........................      2,205
    29,897  BCT.Telus Communications Inc. (A Shares)..............        709
    39,250  Potash Corp. of Saskatchewan, Inc.....................      2,090
                                                                    ---------
                                                                        5,004
                                                                    ---------
  DENMARK (0.5%)
    23,250  Danisco A/S...........................................      1,066
                                                                    ---------
  FRANCE (7.4%)
     5,342  Bongrain..............................................      2,007
    19,750  Cie Generale des Establissements Michelin, Class B
              (Registered)........................................        887
    29,066  Elf Aquitaine.........................................      3,954
    17,730  Groupe Danone.........................................      4,469
       730  Pernod Ricard.........................................         47
    45,800  Rhone-Poulenc, Class A................................      2,075
    47,750  Scor..................................................      2,406
                                                                    ---------
                                                                       15,845
                                                                    ---------
  GERMANY (4.5%)
    97,090  BASF AG...............................................      3,538
    40,620  Bayer AG..............................................      1,513
     3,310  Karstadt AG...........................................      1,185
    58,600  VEBA AG...............................................      3,089
     5,420  Volkswagen AG.........................................        361
                                                                    ---------
                                                                        9,686
                                                                    ---------
  IRELAND (2.8%)
   166,310  Bank of Ireland.......................................      3,489
    69,200  Clondalkin Group plc..................................        494
   342,981  Green Property plc....................................      1,984
                                                                    ---------
                                                                        5,967
                                                                    ---------
  ITALY (3.3%)
   305,000  Mediaset S.p.A........................................      2,873
   700,913  Telecom Italia S.p.A. (RNC)...........................      4,168
                                                                    ---------
                                                                        7,041
                                                                    ---------
  JAPAN (8.7%)
    12,000  Daiichi Pharmaceutical Co. Ltd........................        202
    93,000  Fuji Photo Film Ltd...................................      3,519
    81,000  Fujisawa Pharmaceutical Co., Ltd......................      1,276
   199,000  Hitachi Ltd...........................................      1,474
   178,000  Kao Corp..............................................      3,931
   140,000  Nichido Fire & Marine Insurance Co., Ltd..............        820

<CAPTION>

                                                                      VALUE
  SHARES                                                              (000)
<C>         <S>                                                     <C>
- -----------------------------------------------------------------------------

       568  Nippon Telegraph & Telephone Corp.....................     $5,565
    86,000  Sumitomo Marine & Fire Insurance Co., Ltd.............        550
    14,000  TDK Corp..............................................      1,134
                                                                    ---------
                                                                       18,471
                                                                    ---------
  NETHERLANDS (4.6%)
   119,912  ABN Amro Holding N.V. ................................      2,502
    39,600  Benckiser N.V., Class B...............................      2,225
    60,172  ING Groep N.V. .......................................      3,322
    22,700  Philips Electronics N.V. .............................      1,852
                                                                    ---------
                                                                        9,901
                                                                    ---------
  NEW ZEALAND (0.5%)
   398,100  Lion Nathan Ltd.......................................      1,001
                                                                    ---------
  PORTUGAL (0.8%)
    57,170  Cimpor SGPS...........................................      1,601
                                                                    ---------
  SPAIN (2.9%)
   195,300  Iberdrola.............................................      2,897
    76,908  Telefonica............................................      3,268
                                                                    ---------
                                                                        6,165
                                                                    ---------
  SWEDEN (1.1%)
   404,200  Nordbanken Holding AB.................................      2,315
                                                                    ---------
  SWITZERLAND (8.6%)
     4,061  Cie Financiere Richemont AG, Class A..................      6,766
     2,500  Forbo Holding AG (Registered).........................      1,041
     2,330  Holderbank Financiere Glarus AG, Class B (Bearer).....      2,612
     3,170  Nestle (Registered)...................................      5,773
     2,095  SIG Schweizensche Industrie-Gesellschaft Holding AG
              (Registered)........................................      1,206
     2,610  Swisscom AG...........................................      1,022
                                                                    ---------
                                                                       18,420
                                                                    ---------
  UNITED KINGDOM (11.3%)
   245,000  Allied Domecq plc.....................................      1,825
   553,371  BTR plc...............................................      2,443
   242,304  Blue Circle Industries plc............................      1,396
   158,150  Burmah Castrol plc....................................      2,418
   213,140  English China Clays plc...............................        795
   161,000  Imperial Tobacco Group plc............................      1,666
   241,400  Matthews (Bernard) plc................................        499
   653,333  Pentos plc............................................         --
   398,991  Reckitt & Colman plc..................................      4,322
   375,677  Royal & Sun Alliance Insurance Group plc..............      3,547
   285,200  WPP Group plc.........................................      2,474
   360,100  Wolseley plc..........................................      2,734
                                                                    ---------
                                                                       24,119
                                                                    ---------
  UNITED STATES (34.8%)
    29,600  Albertson's, Inc......................................      1,608
    67,900  Alcoa Inc. ...........................................      2,797
</TABLE>

- --------------------------------------------------------------------------------
                                                         Global Equity Portfolio

                                       41
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

GLOBAL EQUITY PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                      VALUE
  SHARES                                                              (000)
- -----------------------------------------------------------------------------
<C>         <S>                                                     <C>
</TABLE>

  UNITED STATES (CONT.)
<TABLE>
<C>         <S>                                                     <C>
   150,500  American Stores Co....................................     $4,966
   127,000  BJ's Wholesale Club, Inc..............................      3,358
    95,900  Boise Cascade Corp....................................      3,093
    61,450  Borg-Warner Automotive, Inc...........................      2,938
   134,250  COMSAT Corp...........................................      3,885
   103,500  Cadiz, Inc............................................        828
    22,000  Cadiz, Inc. (Restricted Shares).......................        176
    25,850  Chase Manhattan Bank..................................      2,102
   232,050  Data General Corp.....................................      2,349
   118,400  Enhance Financial Services Group, Inc.................      2,694
    65,250  Finova Group, Inc.....................................      3,385
   127,200  GenRad, Inc...........................................      1,828
    22,700  Georgia Pacific Group.................................      1,685
    46,800  Goodrich (BF) Co......................................      1,606
   130,900  Houghton Mifflin Co...................................      6,136
    23,350  IBP, Inc..............................................        435
    83,000  InteliData Technologies Corp..........................        101
    72,130  MBIA, Inc.............................................      4,183
    36,900  Mellon Bank Corp......................................      2,597
    86,000  Noble Drilling Corp...................................      1,489
   147,815  Ocean Energy, Inc.....................................      1,007
   120,100  Penncorp Financial Group, Inc.........................         67
    41,200  Pharmacia & Upjohn, Inc...............................      2,570
   208,150  Philip Morris Cos., Inc...............................      7,324
    52,000  Tenneco, Inc..........................................      1,453
    38,100  Terra Nova (Bermuda) Holdings Ltd., Class A...........        833
    88,900  Tupperware Corp.......................................      1,600
    67,700  UST Corp..............................................      1,479
   100,200  Unicom Corp...........................................      3,664
   135,400  WorldCorp, Inc........................................          7
                                                                    ---------
                                                                       74,243
                                                                    ---------
TOTAL COMMON STOCKS (Cost $192,226)...............................    205,582
                                                                    ---------
PREFERRED STOCKS (0.7%)
  GERMANY (0.7%)
    38,660  Volkswagen AG (Cost $1,125)...........................      1,547
                                                                    ---------
TOTAL FOREIGN & U.S. SECURITIES (97.0%) (Cost $193,351)...........    207,129
                                                                    ---------
</TABLE>

<TABLE>
<CAPTION>
   FACE
  AMOUNT                                                              VALUE
  (000)                                                               (000)
<C>         <S>                                                     <C>
- -----------------------------------------------------------------------------

SHORT-TERM INVESTMENT (2.0%)
  REPURCHASE AGREEMENT (2.0%)
$    4,216  Chase Securities, Inc. 4.65%, dated 3/31/99, due
              4/01/99, to be repurchased at $4,217, collateralized
              by U.S. Treasury Bonds, 8.5% due 2/15/20, valued at
              $4,251 (Cost $4,216)................................     $4,216
                                                                    ---------
</TABLE>

<TABLE>
<C>         <S>                                                     <C>
FOREIGN CURRENCY (0.7%)
GBP      2  British Pound.........................................          4
EUR    116  European Monetary Unit................................        126
JPY 172,185 Japanese Yen..........................................      1,454
 CHF     1  Swiss Franc...........................................         --
                                                                    ---------
TOTAL FOREIGN CURRENCY (Cost $1,565)..............................      1,584
                                                                    ---------
TOTAL INVESTMENTS (99.7%) (Cost $199,132).........................    212,929
                                                                    ---------
</TABLE>

<TABLE>
<S>                                                                  <C>
OTHER ASSETS AND LIABILITIES (0.3%)
  Other Assets.....................................................     2,586
  Liabilities......................................................    (1,913)
                                                                     ---------
                                                                          673
                                                                     ---------
NET ASSETS (100%)..................................................  $213,602
                                                                     ---------
                                                                     ---------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................   $194,696
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 9,779,364 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $19.91
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................    $18,906
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 955,063 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $19.80
                                                                ---------
                                                                ---------
</TABLE>

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

RNC   --  Non-Convertible Savings Shares

- --------------------------------------------------------------------------------
Global Equity Portfolio

                                       42
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
INTERNATIONAL EQUITY PORTFOLIO

The investment objective of the International Equity Portfolio is long-term
capital appreciation through investment primarily in equity securities of
non-U.S. issuers. Equity securities for this purpose include common stocks and
equivalents, such as securities convertible into common stocks, and securities
having common stock characteristics, such as rights and warrants to purchase
common stocks.

For the three months ended March 31, 1999, the Portfolio had a total return of
1.26% for the Class A shares and 1.21% for the Class B shares compared to 1.39%
for the Morgan Stanley Capital International (MSCI) EAFE Index (the "Index").
For the one-year period ended March 31, 1999, the Portfolio had a total return
of 2.83% for the Class A shares and 2.66% for the Class B shares compared to
6.06% for the Index. For the five-year period ended March 31, 1999, the average
annual total return of Class A shares was 13.82% compared to 8.75% for the
Index. From inception on August 4, 1989 through March 31, 1999, the average
annual total return of Class A shares was 12.62% compared to 5.46% for the
Index. From inception on January 2, 1996 through March 31, 1999, the average
annual total return of Class B shares was 15.82% compared to 8.74% for the
Index.

PERFORMANCE COMPARED TO MORGAN STANLEY CAPITAL INTERNATIONAL (MSCI) EAFE
INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                                        TOTAL RETURNS(2)
                                             --------------------------------------
                                                                           AVERAGE
                                                              AVERAGE      ANNUAL
                                                      ONE      ANNUAL       SINCE
                                              YTD    YEAR    FIVE YEARS   INCEPTION
                                             -----   -----   ----------   ---------
<S>                                          <C>     <C>     <C>          <C>
PORTFOLIO -- CLASS A.......................  1.26%   2.83%     13.82%      12.62%
PORTFOLIO -- CLASS B.......................  1.21    2.66      N/A         15.82
INDEX -- CLASS A...........................  1.39    6.06       8.75        5.46
INDEX -- CLASS B...........................  1.39    6.06      N/A          8.74
</TABLE>

1. The MSCI EAFE Index is an unmanaged index of common stocks in Europe,
   Australasia and the Far East (includes dividends net of withholding taxes).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED ARE FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED
AS A GUARANTEE OF THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS
NOT PREDICTIVE OF FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL
FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS
THAN THEIR ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN
RISK CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

The outcome of events in the first quarter of 1999 illustrates once again how
easy it is to be wrong in this business. The U.S. economy continues to surprise
on the upside and in so doing is pulling economists' estimates of world economic
growth up with it. The price of oil rebounded some 40% from its lows within
weeks of The Economist's feature article predicting an oil price of $5 per
barrel. Somewhat out of the blue, Mr. Lafontaine was cast aside just as
investors were becoming increasingly nervous over his socialist agenda. The
Japanese stock market has been the best performing developed market (with the
exception of Finland) up 17.8% in local terms or 12.2% in U.S. dollar terms, in
defiance of most commentators' predictions at the beginning of the year; and
perhaps the most unexpected of all, Olivetti making a takeover bid for Telecom
Italia.

The uptick in global gross domestic product forecasts has sparked a moderate
rally in industrial cyclicals. This rally is probably justifiable as valuations,
particularly in the U.K., were discounting a 1992/93 type recession and were
looking incredibly cheap with free cash flow yields well in excess of long term
bond rates. If the public market didn't correct the valuation anomaly, the
private market most certainly would have.

However, for the rally in industrial cyclicals to go a lot further the market
would need to be convinced that there is a sustainable recovery in world growth.
On this count we remain skeptical given that the main engine of growth is still
the U.S. consumer who's confidence and willingness to borrow is in turn
intertwined with an over-extended and increasingly narrow stock market.

In Japan there is growing hope from foreign investors that the corporate
restructuring is for real this time. This together with the usual fiscal year-
end jockeying has propelled the market. The corporate restructuring
announcements from the likes of Sony, NEC and Hitachi have been on a scale not
seen in Japan before and mergers and acquisitions activity is also beginning to
feature. Even the government has finally acknowledged that the economy has a
supply side problem (not just a demand side problem) and has set up a special
council of business leaders and politicians to address excess industrial
capacity.

- --------------------------------------------------------------------------------
                                                  International Equity Portfolio

                                       43
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
INTERNATIONAL EQUITY PORTFOLIO (CONT.)

To-date the rally in Japan has been typically indiscriminate with a rising tide
lifting all boats, even the ones that are far from seaworthy. We therefore think
there is still plenty of value to be added in Japan from picking the real
restructuring stories and those companies that have a sustainable business
franchise and avoiding those that only pay lip service to restructuring and
shareholder value. Work done by Goldman Sachs suggests that the Nikkei at 16,000
is already discounting a recovery in corporate return on equity from 1.4% to 7%.
If this is the case, the delivery better be good.

Dominic Caldecott
PORTFOLIO MANAGER

Peter Wright
PORTFOLIO MANAGER

William Lock
PORTFOLIO MANAGER

Kate Cornish-Bowden
PORTFOLIO MANAGER

Walter Riddell
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
International Equity Portfolio

                                       44
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

INTERNATIONAL EQUITY PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                      VALUE
   SHARES                                                             (000)
<C>             <S>                                                <C>
- ------------------------------------------------------------------------------

COMMON STOCKS (89.6%)
  AUSTRALIA (1.6%)
   1,571,650    Brambles Industries Ltd..........................  $    39,977
   7,049,100    Fosters Brewing Group Ltd........................       20,759
                                                                   -----------
                                                                        60,736
                                                                   -----------
  BELGIUM (0.2%)
     238,050    G.I.B. Holdings Ltd..............................        9,383
                                                                   -----------
  CANADA (2.8%)
   1,253,333    BCT.Telus Communications, Inc....................       30,766
     450,661    BCT.Telus Communications, Inc. (A Shares)........       10,689
     545,680    Potash Corp. of Saskatchewan, Inc................       29,052
   2,973,600    Renaissance Energy Ltd...........................       34,721
                                                                   -----------
                                                                       105,228
                                                                   -----------
  DENMARK (1.5%)
     382,592    Danisco A/S......................................       17,535
     202,800    Den Danske Bank..................................       21,340
     269,308    Unidanmark A/S, plc, Class A (Registered)........       18,416
                                                                   -----------
                                                                        57,291
                                                                   -----------
  FINLAND (0.5%)
     370,200    Huhtamaki Oyj, Series 1..........................       13,211
   1,318,967    Merita Ltd., plc, Class A........................        7,074
                                                                   -----------
                                                                        20,285
                                                                   -----------
  FRANCE (11.3%)
     354,060    Alcatel Alsthom..................................       40,775
     496,312    Assurances Generales de France (Bearer)..........       26,834
      14,884    Bongrain.........................................        5,591
     223,582    Cie de Saint Gobain..............................       35,540
     567,500    Elf Aquitaine....................................       77,199
     401,415    France Telecom...................................       32,512
     259,540    Groupe Danone....................................       65,420
   1,485,170    Rhone-Poulenc, Class A...........................       67,291
     299,154    Schneider........................................       16,579
     103,386    Scor.............................................        5,210
     337,000    Total, Class B...................................       41,580
     659,095    Usinor Sacilor...................................        8,695
                                                                   -----------
                                                                       423,226
                                                                   -----------
  GERMANY (5.0%)
   1,079,600    BASF AG..........................................       39,342
     724,000    Bayer AG.........................................       26,971
      24,796    Karstadt AG......................................        8,875
   1,688,719    RWE AG...........................................       75,783
      66,910    Viag AG..........................................       36,683
                                                                   -----------
                                                                       187,654
                                                                   -----------
  HONG KONG (1.1%)
  14,554,155    Hong Kong Land Holdings Ltd......................       18,920
   3,561,600    Swire Pacific Ltd., Class A......................       16,545
   6,842,500    Swire Pacific Ltd., Class B......................        4,680
                                                                   -----------
                                                                        40,145
                                                                   -----------

<CAPTION>

                                                                      VALUE
   SHARES                                                             (000)
<C>             <S>                                                <C>
- ------------------------------------------------------------------------------
  ITALY (3.5%)
   3,854,200    Mediaset S.p.A...................................       36,301
  15,689,387    Telecom Italia S.p.A. (RNC)......................       93,311
                                                                   -----------
                                                                       129,612
                                                                   -----------
  JAPAN (18.6%)
   2,948,000    Aisin Seiki Co., Ltd.............................       28,632
     693,600    Aoyama Trading Co., Ltd..........................       18,745
     762,000    Canon, Inc.......................................       18,856
     325,480    Chudenko Corp....................................        6,487
   1,844,000    Daibiru Corp.....................................       13,861
     736,000    Daiichi Pharmaceutical Co., Ltd..................       12,370
     947,000    Eisai Co., Ltd...................................       19,795
   1,567,000    Fuji Photo Film Ltd..............................       59,289
     832,000    Fujisawa Pharmaceutical Co., Ltd.................       13,105
   2,945,000    Hitachi Ltd......................................       21,813
       4,639    Japan Tobacco, Inc...............................       45,056
   3,207,000    Kao Corp.........................................       70,827
   3,899,000    NEC Corp.........................................       46,924
   3,618,000    Nichido Fire & Marine Insurance Co., Ltd.........       21,206
      10,823    Nippon Telegraph & Telephone Corp................      106,032
     714,000    Nomura Securities Co., Ltd.......................        7,477
     486,000    Ono Pharmaceutical Co., Ltd......................       19,620
     509,000    Pioneer Electric Corp............................        9,457
      76,000    Rohm Co..........................................        9,082
      97,000    Sankyo Co., Ltd..................................        2,081
   2,580,000    Shionogi & Co., Ltd..............................       22,661
      67,000    Shiseido Co., Ltd................................          928
   4,485,000    Sumitomo Marine & Fire Insurance Co., Ltd........       28,712
     312,400    Takefuji Corp....................................       24,010
     673,000    Toppan Printing Co., Ltd.........................        8,816
   1,922,000    Toyo Seikan Kaisha Ltd...........................       41,474
     576,000    Yamanouchi Pharmaceutical Co.....................       18,243
                                                                   -----------
                                                                       695,559
                                                                   -----------
  NETHERLANDS (4.2%)
   1,016,500    Akzo Nobel N.V...................................       37,702
     549,158    Buhrmann N.V.....................................        9,561
     330,800    CSM N.V..........................................       17,564
     826,060    Hollandsche Beton Groep N.V......................        8,709
     646,639    ING Groep N.V....................................       35,696
     572,300    Philips Electronics N.V..........................       46,693
                                                                   -----------
                                                                       155,925
                                                                   -----------
  NEW ZEALAND (0.4%)
   5,719,800    Lion Nathan Ltd..................................       14,386
     392,500    Smith City Group Ltd.............................           --
                                                                   -----------
                                                                        14,386
                                                                   -----------
  PORTUGAL (0.5%)
     617,510    Cimentos de Portugal.............................       17,295
                                                                   -----------
</TABLE>

- --------------------------------------------------------------------------------
                                                  International Equity Portfolio

                                       45
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

INTERNATIONAL EQUITY PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                      VALUE
   SHARES                                                             (000)
- ------------------------------------------------------------------------------
<C>             <S>                                                <C>
  SINGAPORE (1.4%)
  16,057,837    Jardine Strategic Holdings, Inc..................       27,138
   3,836,000    United Overseas Bank Ltd. (Foreign)..............       23,989
                                                                   -----------
                                                                        51,127
                                                                   -----------
  SPAIN (2.5%)
   4,960,500    Iberdrola........................................       73,595
     482,250    Telefonica.......................................       20,489
                                                                   -----------
                                                                        94,084
                                                                   -----------
  SWEDEN (2.7%)
   1,606,100    ForeningsSparbanken AB...........................       37,865
   5,100,200    Nordbanken Holding AB............................       29,205
   1,570,500    Svenska Cellulosa AB, Class B....................       34,155
                                                                   -----------
                                                                       101,225
                                                                   -----------
  SWITZERLAND (8.1%)
      49,457    Cie Financiere Richemont AG, Class A.............       82,397
      25,820    Forbo Holding AG (Registered)....................       10,754
      20,931    Holderbank Financiere Glarus AG, Class B
                  (Bearer).......................................       23,461
      45,545    Nestle (Registered)..............................       82,944
      11,524    Schindler Holding AG (Participating
                  Certificates)..................................       17,943
       9,800    Sulzer AG (Registered)...........................        6,272
     106,470    Swisscom AG (Registered).........................       41,678
     120,115    Union Bank of Switzerland AG (Registered)........       37,827
                                                                   -----------
                                                                       303,276
                                                                   -----------
  UNITED KINGDOM (23.7%)
   6,075,800    Aggreko plc......................................       21,005
   4,739,266    Allied Domecq plc................................       35,296
   1,447,569    Allied Zurich plc................................       19,527
   1,189,655    Bank of Scotland.................................       15,817
   6,112,200    BG plc...........................................       35,942
  18,224,600    Billiton plc.....................................       44,089
   6,096,629    Blue Circle Industries plc.......................       35,112
   1,558,769    British American Tobacco plc.....................       12,994
   2,773,300    British Telecommunications plc...................       45,296
  10,028,477    BTR plc..........................................       44,269
   7,909,000    Bunzl plc........................................       31,208
   3,697,950    Burmah Castrol plc...............................       56,545
   6,217,500    Christian Salvesen plc...........................        8,236
   2,208,100    Commercial Union plc.............................       34,424
   3,566,128    English China Clays plc..........................       13,308
   2,904,000    Great Universal Stores plc.......................       31,667
   1,907,700    Imperial Tobacco Group plc.......................       19,740
   5,026,451    John Mowlem & Co. plc............................        9,501
     340,050    Lonrho Africa plc................................          297
   2,745,950    Lonrho plc.......................................       20,096
   1,804,268    National Westminster Bank plc....................       41,623
   4,694,200    Premier Farnell plc..............................       16,229
   3,502,400    Racal Electronic plc.............................       22,519
   5,993,502    Reckitt & Colman plc.............................       64,922
   2,892,400    RMC Group plc....................................       39,181
   3,857,600    Royal & Sun Alliance Insurance Group plc.........       36,426

<CAPTION>

                                                                      VALUE
   SHARES                                                             (000)
<C>             <S>                                                <C>
- ------------------------------------------------------------------------------
   2,613,302    Tate & Lyle plc..................................       17,605
     515,900    Williams plc.....................................        3,334
   4,975,900    Wolseley plc.....................................       37,781
   8,612,900    WPP Group plc....................................       74,719
                                                                   -----------
                                                                       888,708
                                                                   -----------
TOTAL COMMON STOCKS (Cost $2,755,356)............................    3,355,145
                                                                   -----------
PREFERRED STOCKS (1.0%)
  GERMANY (1.0%)
     968,600    Volkswagen AG (Cost $20,022).....................       38,754
                                                                   -----------
</TABLE>

<TABLE>
<CAPTION>
    FACE
   AMOUNT
   (000)
<C>             <S>                                                <C>
- ------------

SHORT-TERM INVESTMENT (5.5%)
  REPURCHASE AGREEMENT (5.5%)
$    206,870    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                  4/01/99, to be repurchased at $206,897 (Cost
                  $206,870)......................................      206,870
                                                                   -----------
FOREIGN
CURRENCY
(5.3%)
  AUD    380    Australian Dollar................................          241
 GBP   4,859    British Pound....................................        7,851
  DKK  6,409    Danish Krone.....................................          932
 EMU 173,010    European Monetary Unit...........................      187,085
JPY  442,484    Japanese Yen.....................................        3,737
                                                                   -----------
TOTAL FOREIGN CURRENCY (Cost $202,853)...........................      199,846
                                                                   -----------
TOTAL INVESTMENTS (101.4%) (Cost $3,185,101).....................    3,800,615
                                                                   -----------
</TABLE>

<TABLE>
<S>                                                                 <C>
OTHER ASSETS AND LIABILITIES (-1.4%)
  Other Assets....................................................     684,500
  Liabilities.....................................................    (738,792)
                                                                    ----------
                                                                       (54,292)
                                                                    ----------
NET ASSETS (100%).................................................  $3,746,323
                                                                    ----------
                                                                    ----------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................  $3,723,601
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 201,485,134 outstanding $0.001 par value
  shares (authorized 500,000,000 shares)......................      $18.48
                                                                ----------
                                                                ----------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $22,722
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 1,232,095 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $18.44
                                                                ----------
                                                                ----------
</TABLE>

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

RNC   --  Non-Convertible Savings Shares

- --------------------------------------------------------------------------------
International Equity Portfolio

                                       46
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
INTERNATIONAL MAGNUM PORTFOLIO

The International Magnum Portfolio seeks long-term capital appreciation by
investing primarily in equity securities of non-U.S. issuers in accordance with
the EAFE country weightings determined by the Adviser. The EAFE countries in
which the Portfolio will invest are those comprising the Morgan Stanley Capital
International (MSCI) EAFE Index, which includes Australia, Japan, New Zealand,
most nations located in Western Europe, and certain developed countries in Asia.

For the three months ended March 31, 1999, the Portfolio had a total return of
- -0.17% for the Class A shares and -0.26% for the Class B shares compared to
1.39% for the MSCI EAFE Index (the "Index"). For the one-year period ended March
31, 1999, the Portfolio had a total return of -6.23% for the Class A shares and
- -6.51% for the Class B shares compared to 6.06% for the Index. From inception on
March 15, 1996 through March 31, 1999, the average annual total return of Class
A shares was 7.21% and 6.92% for Class B shares compared to 9.48% for the Index.

PERFORMANCE COMPARED TO MORGAN STANLEY CAPITAL
INTERNATIONAL (MSCI) EAFE INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                            TOTAL RETURNS(2)
                               -------------------------------------------
                                              ONE        AVERAGE ANNUAL
                                  YTD         YEAR       SINCE INCEPTION
                               ----------  ----------  -------------------
<S>                            <C>         <C>         <C>
PORTFOLIO -- CLASS A(3)......      -0.17%      -6.23%           7.21%
PORTFOLIO -- CLASS B(3)......      -0.26       -6.51            6.92
INDEX........................       1.39        6.06            9.48
</TABLE>

1. The MSCI EAFE Index is an unmanaged index of common stocks and includes
   Europe, Australasia and the Far East (includes dividends net of withholding
   taxes).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

3. The Portfolio commenced operations on March 15, 1996.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK
CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

The first quarter of 1999 stood in stark contrast to 1998 results as once
powerful Europe languished, while Japan and Asia both posted substantial gains
after lackluster performance in the previous year. The Index ended the first
quarter gaining 1.4% in U.S. dollar terms, although performance of individual
markets was mixed. Regionally, Europe saw the most variance in performance and
the weakest returns as the MSCI Europe Index returned 4.3% in local currency
terms (-2.1% in U.S. dollar terms). General economic slowing, unexpected
depreciation of the newly introduced euro and the Brazilian currency devaluation
contributed to European market difficulty. The Japanese market gained surprising
momentum, with the MSCI Japan Index finishing the first quarter up 17.8% in
local currency terms (+12.2% in U.S. dollar terms), the top performing region
and the second highest performing country in EAFE. Government stimulus packages,
news of corporate restructurings and a weakening yen spurred the market and
restored the confidence of wary investors. Asian markets rode the wave of
euphoria on the back of Japan's performance, appreciating 6.6% in local currency
terms (+7.5% in U.S. dollar terms).

The Portfolio's regional allocation strategy during the first quarter
contributed significantly to returns. We maintained an underweight to Europe
throughout the quarter, further reducing our exposure in March to be
approximately 5% below the Index weighting of 71%. At the same time we increased
our exposure to Japan, ending the quarter slightly overweight the Index
weighting of 23%. The Portfolio benefited significantly from this strategy as
Japan and Asia were the relative outperformers, while Europe underperformed.

Portfolio underperformance was attributable primarily to stock selection within
the European portfolio and in Japan. Weak performance of global consumer
defensive industries (where the Portfolio is overweighted) such as food and
household products detracted significantly from results. From a security
perspective, the largest detractors from performance for the first quarter were
European food & household product companies such as Nestle and Reckitt & Colman.
Our underweight in large European banks, which rallied during the quarter due to
the consolidation trend evident in that industry, impacted returns. The
Portfolio held smaller, regional European banks which did not benefit from this
trend. We were also hurt by not holding Japanese banks which saw strong
performance in response to government recapitalization and bail-out packages
announced during the quarter. We believe that

- --------------------------------------------------------------------------------
                                                  International Magnum Portfolio

                                       47
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
INTERNATIONAL MAGNUM PORTFOLIO (CONT.)

banks will continue to experience problems stemming from bad-loan losses,
further bankruptcies and inadequate capital.

During the first quarter we made some adjustments to the European portion of the
Portfolio. We decreased our allocation to smaller cap companies in Europe and
re-deployed to larger cap holdings. However, the Portfolio still holds an
overweighting to small caps in Europe which detracted from overall results as
the largest, most liquid stocks once again outperformed small caps with MSCI
Europe returning -2.5% versus MSCI Europe Small Cap's -3.0% return (in U.S.
dollars). We have strong conviction in the quality names comprising our small
cap segment, and as important, our conviction also remains firm not to own the
expensive mega cap stocks whose performance has dominated the Index recently.

The emergence over the last twelve months of a European "Nifty Fifty" phenomena,
along the lines of the U.S. experience of narrowing leadership among the largest
Index stocks, has been the factor most responsible for the poor relative
performance of our disciplined value strategy in Europe. Slower economic growth,
stiffer competition and lack of pricing power are making it increasingly
difficult for companies to produce the kinds of results investors demand. In
such an environment, investors have gravitated toward stocks with demonstrated
capabilities in generating top-line sales growth or cost reduction from merger
synergies. Not only has value been out of favor, but mega-cap stocks (companies
with a market capitalization of over $20 billion) have beaten all other market
cap segments following the liquidity boom in European equity markets.

It has been difficult to predict value's return to favor. The valuation gap
between mega-cap stocks and small and mid size stocks in Europe is at a
historical high. The European portfolio has exploited this gap by overweighting
quality small and mid cap stocks. But companies face real challenges in today's
operating environment -- walking the tightrope of falling inflation and outright
deflation. In recognition of these challenges we have been opportunistically
reducing our small and mid cap exposure in the Portfolio and redeploying to
larger capitalization stocks which demonstrate attractive relative valuation. We
feel that Mega-cap stocks are overvalued and overpriced, and that this scenario
is not sustainable long term.

Recent events in Europe may be harbingers of value's comeback. The resignation
of German Finance Minister Oskar Lafontaine, the stalwart of the left wing of
the Socialist Democratic Party, was an important turning point for Europe.
Lafontaine's resignation will allow Chancellor Schroder to steer a more moderate
and business friendly course, and has allowed the hesitant European Central Bank
to ease interest rates, having delayed such action due to euro weakness and an
unwillingness to appear politically influenced. As of this writing, the ECB cut
its benchmark short-term rate by 50 basis points to an unexpectedly low 2.5%,
and Britain and Switzerland followed suit and cut rates by 25 and 50 basis
points, respectively. The resignation of the EU Commission is also positive as
the new president of the Commission, former Italian Prime Minister Romano Prodi,
is credited with readying Italy for EMU entrance and is considered to be a
champion of reform necessary to jump-start Eurozone economies. These events may
lead to a more stable outlook for the European economy which, in turn, would
benefit our value discipline.

The Japanese equity market rallied during the first quarter, particularly during
March, as investors began re-evaluating their allocation to Japanese equities.
The Government's proposal to provide 7.4 trillion yen of public funds for
Japanese bank's non-performing loans was officially approved after considerable
debate. Under this scheme banks will issue preference shares to the Japanese
Government to write off non-performing loans and in turn these banks are
expected to comply with the FSA (Financial Supervisory Authority) for disclosure
of non-performing loans as well as definitive measures to improve profitability.
Furthermore, to alleviate the credit crunch for medium to smaller companies the
Government's 20 trillion yen loan guarantee program enacted in 1998 became
available should these companies require such credit. With the above mentioned
factors, investors became increasingly convinced that many of Japan's recent
credit and non-performing loan problems were sufficiently addressed by the
authorities and sentiment regarding investments in Japan greatly improved.

At the same time, full scale restructuring efforts seemed to make daily
headlines on a micro level,

- --------------------------------------------------------------------------------
International Magnum Portfolio

                                       48
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
INTERNATIONAL MAGNUM PORTFOLIO (CONT.)
and business confidence is on the rise as evidenced by the March Tankan report.
NEC, Sony, Mitsubishi Chemical and numerous other leading private sector
companies declared unprecedented labor, production and management changes which
focused on return on equity (ROE) over market share. Highly insular companies
such as Nissan and Sumitomo Rubber also departed from their traditional
"keiretsu" relationships to announce major tie-ups with foreign companies. At
the margin all these changes were viewed positively and evidence to this was the
record 1.8 trillion yen worth of equities purchased by foreign investors during
March.

As we stated in our outlook earlier in the year, we believe 1999 will be
remembered as an important milestone for long term investors in Japanese
equities. However, a "V" shaped economic recovery remains highly unlikely given
the weak domestic Japanese macro activity and rising unemployment. If Japanese
managements embrace Western-style corporate restructuring efforts to yield the
kinds of changes investors demand, corporate earnings should rebound as ROE
improves. However, we believe there will likely be some short term
disappointments when restructuring erodes short term profitability and the
market becomes subject to corrections as investors realize that momentum may
have carried the market ahead of economic reality. We believe that the light at
the end of the ten-year depressed economy will likely shine for Japanese
consumer technology industries such as Sony's new Playstation II which may in
time become a "home server" for numerous applications and fuel new consumer
demand for Japanese consumer related products.

Following the lead of Japan, markets in Asia ex-Japan ended the quarter ahead of
their 1998 year-end levels. Asia has been riding the wave of euphoria created by
the Nikkei's rise in March, and these markets began to benefit from increased
attention by foreign investors as they outperformed other developed markets.
Hong Kong led the rally as the Hang Seng Index climbed to levels not seen since
April 1998. Although the economies of the region have been seeing marginal
economic improvement, the strong performance in March was almost wholly
attributable to the newfound confidence in Japanese equities. Our strategy of
favoring the global franchise names and owning finance, consumer goods and
services companies was successful as these holdings outperformed relative to the
region.

We are optimistic about Asia and have increased our weighting in the Portfolio
to approximately neutral with the Index weighting. Valuations remain attractive
relative to historic averages and interest rate declines will support the case
for revaluation. As of this writing, the Hong Kong Monetary Authority cut
interest rates by 25 basis points on April 9th, following the lead of central
banks in Europe, and we expect further rate cuts by year-end. Increased
liquidity and Asian consumers' heightened optimism along with their willingness
to spend should sustain the economic recovery. Markets have clearly rewarded
companies that adopt Western style restructuring with a focus on enhancing
shareholder value and we expect to see this trend continue in the balance of
1999.

Francine J. Bovich
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
                                                  International Magnum Portfolio

                                       49
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

INTERNATIONAL MAGNUM PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  VALUE
 SHARES                                                           (000)
<C>          <S>                                                <C>
- -------------------------------------------------------------------------

COMMON STOCKS (87.8%)
  AUSTRALIA (2.0%)
    8,600    Brambles Industries Ltd..........................  $     219
   28,450    Broken Hill Proprietary Co., Ltd.................        243
   67,250    Colonial Ltd.....................................        268
   19,950    Commonwealth Bank Of Australia...................        328
  160,400    Fosters Brewing Group Ltd........................        472
   10,160    Lend Lease Corp., Ltd............................        129
   30,030    National Australia Bank Ltd......................        546
   59,700    News Corp., Ltd..................................        442
  118,100    Oil Search Ltd...................................        142
   20,450    Rio Tinto Ltd....................................        286
   94,550    Telstra Corp., Ltd...............................        495
   65,100    Westpac Banking Corp.............................        475
   81,200    WMC Ltd..........................................        259
                                                                ---------
                                                                    4,304
                                                                ---------
  BELGIUM (0.6%)
   33,425    G.I.B. Holdings Ltd..............................      1,317
                                                                ---------
  DENMARK (1.4%)
   16,890    Novo-Nordisk A/S, Class B........................      1,892
   16,010    Unidanmark A/S, Class A (Registered).............      1,095
                                                                ---------
                                                                    2,987
                                                                ---------
  FINLAND (2.7%)
   49,305    KCI Konecranes International.....................      1,706
   15,725    Kone Oyj, Class B................................      1,658
  248,610    Merita Ltd., Class A.............................      1,334
   30,400    Sampo Insurance Co., plc, Class A................        953
   26,308    The Rauma Group..................................        306
                                                                ---------
                                                                    5,957
                                                                ---------
  FRANCE (9.5%)
    5,610    Alcatel Alsthom..................................        646
   15,531    Cie de Saint Gobain..............................      2,469
   82,750    CNP Assurances...................................      2,179
   14,440    Elf Aquitaine....................................      1,964
    6,882    Groupe Danone....................................      1,735
   49,090    Compagnie Generale des Establissements Michelin,
               Class B........................................      2,206
   35,460    Pernod Ricard....................................      2,256
   34,350    Rhone-Poulenc, Class A...........................      1,556
   37,690    Schneider........................................      2,089
   30,450    Total, Class B...................................      3,757
                                                                ---------
                                                                   20,857
                                                                ---------
  GERMANY (6.6%)
   11,940    Adidas AG........................................      1,060
   55,300    BASF AG..........................................      2,015
   48,010    Bayerische Vereinsbank AG........................      2,887
   25,655    Bewag Aktiengesellschaft.........................        527
    3,038    Buderus AG.......................................        982
   13,520    Henkel KGaA-Vorzug...............................        987
    9,550    Hoechst AG.......................................        407

<CAPTION>

                                                                  VALUE
 SHARES                                                           (000)
<C>          <S>                                                <C>
- -------------------------------------------------------------------------

   11,434    Philipp Holzmann AG..............................  $   1,471
    7,650    Plettac AG.......................................        407
   25,400    VEBA AG..........................................      1,339
    1,790    Viag AG..........................................        982
   20,480    Volkswagen AG....................................      1,364
                                                                ---------
                                                                   14,428
                                                                ---------
  HONG KONG (1.7%)
  226,000    Cathay Pacific Airways Ltd.......................        260
   36,000    Cheung Kong Holdings Ltd.........................        274
   35,500    CLP Holdings, Ltd................................        170
  110,000    China Telecom Ltd................................        183
   99,000    Dairy Farm International Holdings Ltd............        115
   98,300    Hong Kong & China Gas Co., Ltd...................        139
  135,200    Hong Kong Telecommunications Ltd.................        267
   11,600    HSBC Holdings plc................................        364
   91,000    Hutchison Whampoa Ltd............................        716
   61,000    Li & Fung Ltd....................................        129
   58,000    Smartone Telecommunications......................        168
   70,000    Sun Hung Kai Properties Ltd......................        524
   53,000    Swire Pacific Ltd., Class A......................        246
   39,000    Television Broadcasts Ltd........................        142
                                                                ---------
                                                                    3,697
                                                                ---------
  IRELAND (0.9%)
   93,430    Bank of Ireland..................................      1,960
                                                                ---------
  ITALY (4.5%)
   57,905    Banca Popolare Di Bergamo S.p.A..................      1,471
  211,200    Marzotto (Gaetano) & Figli S.p.A.................      1,793
  178,800    Mediaset S.p.A...................................      1,684
  292,200    Sogefi S.p.A.....................................        777
  706,111    Telecom Italia S.p.A. (RNC)......................      4,200
                                                                ---------
                                                                    9,925
                                                                ---------
  JAPAN (22.7%)
   17,000    Aiwa Co., Ltd....................................        392
  113,000    Amada Co., Ltd...................................        601
    8,200    Autobacs Seven Co., Ltd..........................        336
   59,000    Canon, Inc.......................................      1,460
   75,000    Casio Computer Co., Ltd..........................        509
   60,000    Dai Nippon Printing Co., Ltd.....................        912
  203,000    Daicel Chemical Industries Ltd...................        669
  113,000    Daifuku Co., Ltd.................................        749
   88,000    Daikin Industries Ltd............................        872
   12,200    FamilyMart Co., Ltd..............................        619
   39,000    Fuji Machine Manufacturing Co....................      1,400
   39,000    Fuji Photo Film Ltd..............................      1,476
   71,000    Fujitec Co., Ltd.................................        577
  119,000    Fujitsu Ltd......................................      1,911
  166,000    Furukawa Electric Co.............................        687
   38,800    Hitachi Credit Corp..............................        770
  224,000    Hitachi Ltd......................................      1,659
  129,000    Kaneka Corp......................................      1,024
   47,000    Kurita Water Industries Ltd......................        769
</TABLE>

- --------------------------------------------------------------------------------
International Magnum Portfolio

                                       50
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

INTERNATIONAL MAGNUM PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                  VALUE
 SHARES                                                           (000)
- -------------------------------------------------------------------------
<C>          <S>                                                <C>
</TABLE>

  JAPAN (CONT.)
<TABLE>
<C>          <S>                                                <C>
   17,600    Kyocera Corp.....................................  $     948
   63,000    Kyudenko Co., Ltd................................        386
   42,000    Lintec Corp......................................        408
   81,000    Matsushita Electric Industrial Co., Ltd..........      1,580
   44,000    Minebea Co., Ltd.................................        455
  234,000    Mitsubishi Chemical Corp.........................        664
   85,000    Mitsubishi Estate Co., Ltd.......................        865
  213,000    Mitsubishi Heavy Industries Ltd..................        962
   58,000    Mitsumi Electric Co., Ltd........................      1,161
  153,000    NEC Corp.........................................      1,841
   57,000    Nifco, Inc.......................................        538
   17,000    Nintendo Corp., Ltd..............................      1,467
      161    Nippon Telegraph & Telephone Corp................      1,577
  289,000    Nissan Motor Co., Ltd............................      1,123
   54,000    Nissha Printing Co., Ltd.........................        366
       85    NTT Data Corp....................................        658
   28,000    Ono Pharmaceutical Co., Ltd......................      1,130
  147,000    Ricoh Co., Ltd...................................      1,536
   32,800    Rinnai Corp......................................        659
    6,000    Rohm Co..........................................        717
   13,000    Ryosan Co........................................        212
   18,000    Sangetsu Co., Ltd................................        289
   62,000    Sankyo Co., Ltd..................................      1,330
  103,000    Sanwa Shutter Corp...............................        531
   71,000    Sekisui Chemical Co..............................        505
   49,000    Sekisui House Co., Ltd...........................        521
   99,000    Shin-Etsu Polymer Co., Ltd.......................        569
   22,100    Sony Corp........................................      2,044
   65,000    Suzuki Motor Co., Ltd............................        862
   16,000    TDK Corp.........................................      1,296
  240,000    Toshiba Corp.....................................      1,640
   37,000    Toyota Motor Corp................................      1,072
  168,000    Tsubakimoto Chain Co.............................        390
   59,000    Yamaha Corp......................................        625
   46,000    Yamanouchi Pharmaceutical Co., Ltd...............      1,457
                                                                ---------
                                                                   49,776
                                                                ---------
  MALAYSIA (0.0%)
   21,000    Carlsberg Brewery Malaysia Bhd...................         55
    8,000    Rothmans of Pall Mall (Malaysia) Bhd.............         47
                                                                ---------
                                                                      102
                                                                ---------
  NETHERLANDS (2.9%)
   53,135    Akzo Nobel N.V. .................................      1,971
   50,700    ING Groep N.V. ..................................      2,799
   19,650    Philips Electronics N.V. ........................      1,603
                                                                ---------
                                                                    6,373
                                                                ---------
<CAPTION>

                                                                  VALUE
 SHARES                                                           (000)
<C>          <S>                                                <C>
- -------------------------------------------------------------------------

  NEW ZEALAND (0.1%)
   85,700    Fletcher Challenge Building......................  $     116
   30,900    Telecom Corp. of New Zealand Ltd. (Installment
               Receipts-Final Installment: NZD 4.15/share due
               3/31/99).......................................        151
                                                                ---------
                                                                      267
                                                                ---------
  NORWAY (0.7%)
   74,285    Sparebanken......................................      1,444
                                                                ---------
  PORTUGAL (0.8%)
   93,050    Electricidade de Portugal........................      1,839
                                                                ---------
  SINGAPORE (0.5%)
   30,000    City Developments Ltd............................        156
   43,000    Natsteel Electronics Ltd.........................        118
   20,000    Oversea-Chinese Banking Corp. (Foreign)..........        136
   17,000    Singapore Airlines Ltd. (Foreign)................        123
   89,000    Singapore Technologies Engineering Ltd. .........         80
   40,000    United Overseas Bank Ltd. (Foreign)..............        250
   29,000    Venture Manufacturing Ltd........................        131
                                                                ---------
                                                                      994
                                                                ---------
  SPAIN (3.0%)
   44,990    Banco Bilbao Vizcaya.............................        672
   49,800    Banco Santander..................................      1,023
   68,300    Endesa...........................................      1,727
   88,650    Iberdrola........................................      1,315
   35,608    Telefonica.......................................      1,513
   34,200    Uralita..........................................        305
                                                                ---------
                                                                    6,555
                                                                ---------
  SWEDEN (3.4%)
   52,100    Autoliv, Inc.....................................      1,987
  369,500    Nordbanken Holding AB............................      2,116
   98,300    Svedala Intrustri AB.............................      1,718
   48,840    Svenska Handelsbanken, Class A...................      1,705
                                                                ---------
                                                                    7,526
                                                                ---------
  SWITZERLAND (7.3%)
    2,718    Cie Financiere Richemont AG, Class A.............      4,528
    3,080    Forbo Holding AG (Registered)....................      1,283
    2,000    Holderbank Financiere Glarus AG, Class B
               (Bearer).......................................      2,242
    2,100    Nestle (Registered)..............................      3,824
      985    Schindler Holding AG (Registered)................      1,665
    3,220    Swisscom AG......................................      1,261
    3,440    Union Bank of Switzerland AG (Registered)........      1,083
                                                                ---------
                                                                   15,886
                                                                ---------
</TABLE>

- --------------------------------------------------------------------------------
                                                  International Magnum Portfolio

                                       51
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

INTERNATIONAL MAGNUM PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                  VALUE
 SHARES                                                           (000)
- -------------------------------------------------------------------------
<C>          <S>                                                <C>
  UNITED KINGDOM (16.5%)
  716,500    Aegis Group plc..................................  $   1,580
  302,620    Allied Domecq plc................................      2,254
   93,600    Allied Zurich plc................................      1,263
  142,970    Bank of Scotland.................................      1,901
  209,005    BG plc...........................................      1,229
  139,700    BOC Group plc....................................      1,950
   87,100    British Telecommunications plc...................      1,422
  170,752    Burmah Castrol plc...............................      2,611
  180,050    Capital Radio plc................................      1,978
  541,600    Devro plc........................................      1,251
  123,236    Diageo plc.......................................      1,386
  185,160    Great Universal Stores plc.......................      2,019
1,095,400    Halma plc........................................      1,646
  220,100    Imperial Tobacco Group plc.......................      2,277
  578,100    Morgan Crucible Co...............................      2,045
2,648,100    Premier Oil plc..................................        599
  250,056    Reckitt & Colman plc.............................      2,709
  110,920    RMC Group plc....................................      1,502
  192,583    Royal & Sun Alliance Insurance Group plc.........      1,818
  316,600    WPP Group plc....................................      2,747
                                                                ---------
                                                                   36,187
                                                                ---------
TOTAL COMMON STOCKS (Cost $187,149)...........................    192,381
                                                                ---------
PREFERRED STOCKS (2.7%)
  GERMANY(2.7%)
    4,716    Dyckerhoff AG....................................      1,270
   16,140    Fresenius AG.....................................      3,194
    4,480    Suedzucker AG....................................      1,574
                                                                ---------
TOTAL PREFERRED STOCKS (Cost $7,191)..........................      6,038
                                                                ---------
</TABLE>

<TABLE>
<CAPTION>
 NO. OF
WARRANTS
<C>          <S>                                                <C>
- ---------

WARRANTS (0.0%)
  HONG KONG (0.0%)
   10,650    Hong Kong & China Gas Co., Ltd., expiring 9/30/99
               (Cost $0)......................................         --
                                                                ---------
</TABLE>

<TABLE>
<CAPTION>
  FACE
 AMOUNT                                                           VALUE
  (000)                                                           (000)
<C>          <S>                                                <C>
- -------------------------------------------------------------------------

SHORT TERM INVESTMENTS (7.5%)
  REPURCHASE AGREEMENT (7.5%)
$  16,507    Chase Securities, Inc. 4.65%, dated 3/31/99, due
               4/01/99, to be repurchased at $16,509,
               collateralized by U.S. Treasury Bonds, 9.25%,
               due 2/15/16, valued at $16,649 (Cost
               $16,507).......................................  $  16,507
                                                                ---------
FOREIGN CURRENCY (0.3%)
   AUD 23    Australian Dollar................................         15
  GBP   5    British Pound....................................          8
  DKK 302    Danish Krone.....................................         44
  EMU 464    European Monetary Unit...........................        502
   HKD 18    Hong Kong Dollar.................................          2
   MYR 17    Malaysian Ringgit................................          5
                                                                ---------
TOTAL FOREIGN CURRENCY (Cost $571)............................        576
                                                                ---------
TOTAL INVESTMENTS (98.3%) (Cost $211,418).....................    215,502
                                                                ---------
</TABLE>

<TABLE>
<S>                                                             <C>
OTHER ASSETS AND LIABILITIES (1.7%)
  Other Assets................................................     58,187
  Liabilities.................................................    (54,551)
                                                                ---------
                                                                    3,636
                                                                ---------
NET ASSETS (100%).............................................  $ 219,138
                                                                ---------
                                                                ---------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................   $194,308
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 16,825,880 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $11.55
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................    $24,830
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 2,157,266 outstanding $0.001 par
  value shares (authorized 500,000,000 shares)................     $11.51
                                                                ---------
                                                                ---------
</TABLE>

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

RNC   --  Non-Convertible Savings Shares

- --------------------------------------------------------------------------------
International Magnum Portfolio

                                       52
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
INTERNATIONAL SMALL CAP PORTFOLIO

The International Small Cap Portfolio seeks long-term capital appreciation by
investing primarily in the equity securities of non-U.S. issuers. The Portfolio
applies a disciplined bottom-up value approach to identify and invest in small
capitalization companies which are both attractive businesses and available at
cheap prices. A market capitalization cut-off of U.S. $1 billion is used as our
definition of "small."

For the three months ended March 31, 1999, the Portfolio had a total return of
1.77% compared to a total return of 2.78% for the Morgan Stanley Capital
International (MSCI) EAFE Small Cap Index (the "Index"). For the one-year period
ended March 31, 1999, the total return for the Portfolio was -7.11% compared to
- -8.42% for the Index. For the five-year period ended March 31, 1999, the average
annual total return for the Portfolio was 3.48% compared to -4.79% for the
Index. From inception on December 15, 1992 through March 31, 1999, the average
annual total return of the Portfolio was 11.21% compared to 2.77% for the Index.

PERFORMANCE COMPARED TO MORGAN STANLEY CAPITAL INTERNATIONAL (MSCI) EAFE SMALL
CAP INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                            TOTAL RETURNS(2)
                           --------------------------------------------------
                                                                   AVERAGE
                                                     AVERAGE        ANNUAL
                                          ONE         ANNUAL        SINCE
                              YTD         YEAR      FIVE YEARS    INCEPTION
                           ----------  ----------  ------------  ------------
<S>                        <C>         <C>         <C>           <C>
PORTFOLIO................       1.77%      -7.11%        3.48%        11.21%
INDEX....................       2.78       -8.42        -4.79          2.77
</TABLE>

1. The MSCI EAFE Small Cap Index is an arithmetic, unmanaged, market value
   weighted average of the performance of over 900 securities of companies
   listed on the stock exchanges of countries in Europe, Australasia and the Far
   East with a fixed market capitalization cut off of U.S. $200-$800 million
   (this index is a price only index and does not include dividends).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED ARE AS MEASURED BY THE MSCI EAFE SMALL CAP INDEX AND ARE FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF THE
PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK
CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

The rather muted Index return for the quarter, masks a much stronger return in
local currency terms (EAFE Small Cap +8.13%) offset by U.S. dollar strength, and
some strong market returns most notably Japan (+19.5%) and Singapore (+17.7%).
Importantly, the Index outperformed large cap EAFE for the first time in many
quarters although this primarily reflected strong relative returns in Japan, the
U.K. and Scandinavia. In the core European markets small caps continued to lag
largely, we believe, as a result of the introduction of the Euro. The large
pension funds, most notably in the Netherlands and Ireland, reduced their
holdings in domestic small caps in order to increase weightings in large cap
'Euroland'. We believe this process is now largely complete and have started to
see some rebound in European small caps in the last few weeks.

The key contributor to the Portfolio's underperformance during the quarter was
its low weighting in Japan which cost 1.5% of relative performance.
Exceptionally strong stock selection in Australia (Solution 6, ERG, Eltin,
Skilled Engineering and Ausdoc) together with strong returns in Italy
(Buffetti), Germany (Kamps, Sartorius) and Switzerland (Publigroup) more than
compensated for the negative impact of the Japanese underweight in January and
February leading to strong relative returns. Stock selection, however, was not
sufficient in March to offset both Japan and weak returns in the U.K. (Devro and
GEI) and the Netherlands (OPG, Samas).

Turnover for the quarter was 7%, in line with the long-term average. Star City,
an Australian casino operator was sold having reached our assessed fair value
following strong outperformance. New positions were created in Neopost, a French
IPO, Asia Security Printing in Japan and Telestra in Finland.

Neopost is the second largest supplier of franking machines in the world after
Pitney Bowes and is the largest player in Europe with 64% of the market in
France and 25% in the U.K. The business enjoys good visibility, thanks to strong
recurring revenues (60%+) and high barriers to entry. Neopost is in a strong
position to benefit from its new products (on-line services) which should boost
future growth. The stock was priced at 13 times prospective earnings and 5.8
times cash flow, attractive multiples given the quality of the business and its
growth prospects.

Asia Securities Printing is one of the leading Japanese providers of consultancy
and printing services

- --------------------------------------------------------------------------------
                                               International Small Cap Portfolio

                                       53
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
INTERNATIONAL SMALL CAP PORTFOLIO (CONT.)

for accounting and legal documents for stock exchange listed companies. Its
revenue stream is mainly recurrent as companies tend not to change printing
companies given the confidential nature of the material. Growth for Asia
Securities Printing is derived from IPO's (new clients) as well as the financial
deregulation of the Japanese financial markets which is leading to a higher
number of mutual trusts and other financial products for which disclosure
documents will have to be printed. The shares were purchased on an earnings
ratio of 14 times, price cash flow ratio of 12 times and economic value
added/earnings before interest taxes depreciation & amortization (EV/EBITDA)
ratio of 2.5 times, which represented a very substantial discount to its peer
group valuation and our discounted cash flow (DCF).

Teleste is a Finnish provider of cable network equipment and multi-media
language training products. Within the European market for cable network
equipment, Teleste is the third largest player. This market is expected to
experience dramatic growth during the next few years as the cable operators
upgrade their networks to cater to telephony services, digital TV and
interactive services. The shares were purchased on a price earnings ratio of
17.5 times and price cash flow ratio of 12.7 times which we believe offers
attractive value given growth prospects and peer group valuations.

The U.S. economy has continued to enjoy solid, low inflationary growth, despite
our ongoing concerns over its sustainability, and it has certainly helped
confidence in the rest of the world, most particularly Asia. Nevertheless the
capital goods cycle has been weak as expected and the Portfolio benefited during
the quarter from its reduced exposure to this sector.

The Asian markets have bounced back strongly with the exception of Hong Kong. We
continue to worry over China and its ability to walk its tight rope of reform
given increasing cross winds of domestic pressure and loss of export
competitiveness. Nevertheless valuations in small cap Hong Kong appear to more
than discount this concern and a recent visit has uncovered some interesting new
ideas.

In contrast we continue to struggle with value in Japan and Singapore. The
Japanese Government's efforts to solve the banking crisis are indeed encouraging
but the headline-making announcements of significant restructuring measures from
corporate Japan -- Sony and Hitachi to name two -- do not reflect what we are
seeing at the smaller company level. Although the Portfolio's Japanese weighting
has doubled over the last year from 8% to 17% this still leaves us shy of the
32% Index weight and reflects our difficulties in finding quality business
franchises in Japan on attractive multiples. The recent rally in small caps was
largely focussed in growth names despite their already demanding valuations.
Deeply discounted Japanese value, while available in abundance, has barely moved
and will require greater evidence of a change in management's attitudes to
shareholder value or, more likely, increasing merger and acquisition activity of
which we are just starting to see the first signs.

In Singapore what is striking is the shortage of quality business franchises
available. Moreover, just as in Japan, the much touted corporate restructuring,
which is currently the key driver of earnings growth in this market, is limited
to large cap dominated conglomerates and banks.

In Europe the European Central Bank's recent 0.5% interest rate cut has
positively surprised investors, adding to the relief provided by the resignation
of Mr. Lafontaine in Germany during the quarter. Despite a recent rally in
cyclicals, however, we remain cautious on the outlook for core Europe although
we continue to be impressed with the nimbleness of many small cap management
teams in working around the restrictive working practices in France and Germany.
The U.K. looks increasingly like a soft landing and recent strength has rewarded
the Portfolio's increased weighting here.

While it was pleasing to see small caps finally starting to enjoy some relative
strength in some markets, this is only the tip of the iceberg given the relative
underperformance of small caps over the last few years. Valuations are
compelling.

Margaret Naylor
PORTFOLIO MANAGER

Willem Vinke
PORTFOLIO MANAGER

Nathalie Degaus
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
International Small Cap Portfolio

                                       54
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

INTERNATIONAL SMALL CAP PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                     VALUE
  SHARES                                                             (000)
<C>            <S>                                                <C>
- -----------------------------------------------------------------------------

COMMON STOCKS (93.5%)
  AUSTRALIA (9.2%)
  1,396,940    Ausdoc Group Ltd.................................  $     2,837
    623,503    Auspine Ltd......................................          653
  1,748,543    Australian Hospital Care Ltd.....................        1,116
    887,866    Bains Harding Ltd................................          115
    361,560    BRL Hardy Ltd....................................        1,549
  1,973,731    Eltin Ltd........................................        1,891
  7,440,847    E.R.G. Ltd.......................................        8,546
  7,490,464    Parbury Ltd......................................        1,331
    683,700    Ramsay Health Care Ltd...........................          646
  1,490,614    Skilled Engineering Ltd..........................        2,365
  1,188,900    Solution 6 Holdings Ltd..........................        1,848
                                                                  -----------
                                                                       22,897
                                                                  -----------
  DENMARK (1.0%)
     72,400    Sydbank A/S......................................        2,370
                                                                  -----------
  FINLAND (5.9%)
     87,308    KCI Konecranes International.....................        3,021
     47,573    Kone Oyj, Class B................................        5,016
    314,100    Metsa Tissue Oyj.................................        2,377
    282,458    Rapala Normark Corp..............................        2,205
     71,200    Teleste Oyj......................................          643
    134,010    The Rauma Group..................................        1,558
                                                                  -----------
                                                                       14,820
                                                                  -----------
  FRANCE (7.0%)
     34,569    Algeco...........................................        2,411
     24,500    Chargeurs........................................        1,306
     21,999    Dauphin O.T.A....................................        1,713
     41,053    De Dietrich et Compagnie.........................        1,994
     93,113    Europeene d'Extincteurs..........................        4,566
     90,490    Legris Industries................................        4,208
     87,250    Neopost S.A......................................        1,406
                                                                  -----------
                                                                       17,604
                                                                  -----------
  GERMANY (5.4%)
     60,094    Beru AG..........................................        1,170
     11,680    Kamps AG.........................................        1,225
     81,120    Marseille-Kliniken AG............................        1,197
    117,509    Moebel Walther AG................................        2,033
     18,134    Philipp Holzmann AG..............................        2,333
      3,432    Plettac AG.......................................          183
     13,510    Sartorius AG.....................................        2,760
     93,230    Winkler & Duennebier AG..........................        2,551
                                                                  -----------
                                                                       13,452
                                                                  -----------
  HONG KONG (2.2%)
  1,514,000    Li & Fung Ltd....................................        3,204
  7,657,000    Vitasoy International Holdings Ltd...............        2,223
                                                                  -----------
                                                                        5,427
                                                                  -----------

<CAPTION>

                                                                     VALUE
  SHARES                                                             (000)
<C>            <S>                                                <C>
- -----------------------------------------------------------------------------

  IRELAND (3.6%)
  1,809,127    Anglo Irish Bank Corp. plc (British Pound
                 Shares)........................................  $     5,223
    100,005    Clondalkin Group plc.............................          714
    539,556    Green Property plc...............................        3,122
                                                                  -----------
                                                                        9,059
                                                                  -----------
  ITALY (2.9%)
  1,174,200    Buffetti S.p.A...................................        5,016
    459,000    Sogefi S.p.A.....................................        1,221
     18,200    Vincenzo Zucchi S.p.A............................          135
    207,050    Vincenzo Zucchi S.p.A. (NCS).....................          940
                                                                  -----------
                                                                        7,312
                                                                  -----------
  JAPAN (17.2%)
     94,800    Aiful Corp.......................................        6,461
    237,900    Asatsu, Inc......................................        6,671
     37,000    Asia Securities Printing Co., Ltd................          523
     72,400    Disco Corp.......................................        2,813
    231,000    Foster Electric Co., Ltd.........................        1,385
    760,000    Hankyu Realty Co., Ltd...........................        3,126
    227,000    Hanshin Department Store Ltd.....................          949
     86,000    H.I.S. Co., Ltd..................................        2,528
    780,000    Japan Oil Transportation Co., Ltd................        1,449
    117,000    Kirin Beverage Corp..............................        2,149
    131,600    Maezawa Kasei Industries.........................        1,556
    135,000    Nifco, Inc.......................................        1,274
    676,000    Nissan Fire & Insurance Co.......................        1,953
    110,000    Nissei Industries................................          743
     64,000    Rock Field Co., Ltd..............................        1,519
    136,000    Sotoh Co., Ltd...................................          689
    598,000    Toc Co...........................................        4,545
    240,000    Ushio, Inc.......................................        2,556
                                                                  -----------
                                                                       42,889
                                                                  -----------
  NETHERLANDS (7.1%)
     74,600    Ahrend Groep N.V. ...............................        1,303
    103,595    Apothekers Cooperatie OPG........................        2,218
     52,373    Atag Holding N.V. ...............................          971
     83,850    Benckiser N.V., Class B..........................        4,710
    105,700    GTI Holding N.V..................................        2,057
    118,299    Hollandsche Beton Groep N.V. ....................        1,247
     58,510    International Muller.............................        1,199
     67,600    Nutreco Holding N.V. ............................        2,789
     95,532    Samas Groep N.V. ................................        1,240
                                                                  -----------
                                                                       17,734
                                                                  -----------
  NEW ZEALAND (2.1%)
  1,111,100    Auckland International Airport Ltd...............        1,629
    766,736    Fisher & Paykel Industries Ltd...................        2,544
    842,700    Fletcher Challenge Building......................        1,141
                                                                  -----------
                                                                        5,314
                                                                  -----------
</TABLE>

- --------------------------------------------------------------------------------
                                               International Small Cap Portfolio

                                       55
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

INTERNATIONAL SMALL CAP PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                     VALUE
  SHARES                                                             (000)
- -----------------------------------------------------------------------------
<C>            <S>                                                <C>
  NORWAY (2.2%)
     70,850    Adelsten ASA, Class B............................  $       431
    121,900    Kverneland ASA...................................        2,480
    228,020    Oceanor..........................................           --
    128,268    Sparebanken......................................        2,493
                                                                  -----------
                                                                        5,404
                                                                  -----------
  SINGAPORE (0.6%)
  1,101,000    GP Batteries International Ltd...................        1,613
                                                                  -----------
  SPAIN (1.2%)
    105,358    Miquel y Costas & Miquel.........................        3,025
                                                                  -----------
  SWEDEN (2.8%)
    104,900    Haldex AB........................................        1,508
    245,240    Nobel Biocare AB.................................        3,377
     75,510    Scandic Hotels AB................................        2,171
                                                                  -----------
                                                                        7,056
                                                                  -----------
  SWITZERLAND (6.3%)
        957    Bobst AG (Bearer)................................        1,134
     10,567    Edipresse (Bearer)...............................        2,433
      9,440    PubliGroupe......................................        4,098
      4,841    SIG Schweizensche Industrie-Gesellschaft Holding
                 AG (Registered)................................        2,787
     11,154    Valora Holding AG................................        2,629
      6,305    Zehnder Holding AG, Class B......................        2,648
                                                                  -----------
                                                                       15,729
                                                                  -----------
  UNITED KINGDOM (16.8%)
    981,300    Aegis Group plc..................................        2,164
    350,970    Capital Radio plc................................        3,856
  1,118,190    Devro plc........................................        2,583
  2,540,850    Donelon Tyson plc................................           --
  2,159,498    GEI International plc............................        1,378
    889,423    Informa Group plc................................        4,828
  1,024,665    John Mowlem & Co. plc............................        1,937
 33,795,100    Kendell plc......................................           --
    214,635    Le Riches Stores plc.............................        1,716
    676,800    Litho Supplies plc...............................        1,564
  2,631,600    Matthews (Bernard) plc...........................        5,442
    673,960    NHP plc..........................................        1,960
    459,700    Oriflame International...........................        1,337
  2,659,393    Pentos plc.......................................           --
    577,200    Quadramatic plc..................................        1,520
    177,172    Seton Scholl Healthcare Group plc................        2,304
    373,700    SGB Group plc....................................        1,364
  1,149,800    SIG plc..........................................        2,879
  1,509,500    The 600 Group plc................................        1,780
  1,086,300    Time Products plc................................        1,518
    392,600    Westminster Health Care Holdings plc.............        1,915
                                                                  -----------
                                                                       42,045
                                                                  -----------
TOTAL COMMON STOCKS (Cost $250,635).............................      233,750
                                                                  -----------

<CAPTION>

                                                                     VALUE
  SHARES                                                             (000)
<C>            <S>                                                <C>
- -----------------------------------------------------------------------------

PREFERRED STOCKS (2.5%)
  GERMANY (2.5%)
      9,355    Dyckerhoff AG....................................  $     2,519
      6,111    STO AG-Vorzug....................................        1,255
    158,703    Wuerttembergische Metallwarenfabrik AG...........        2,488
                                                                  -----------
TOTAL PREFERRED STOCKS (Cost $7,703)............................        6,262
                                                                  -----------
</TABLE>

<TABLE>
<CAPTION>
  NO. OF
  RIGHTS
<C>            <S>                                                <C>
- -----------

RIGHTS (0.1%)
  AUSTRALIA (0.1%)
      1,189    Solution 6 Holdings Ltd. (Cost $0)...............          339
                                                                  -----------
TOTAL FOREIGN SECURITIES (96.1%) (Cost $258,338)................      240,351
                                                                  -----------
</TABLE>

<TABLE>
<CAPTION>
   FACE
  AMOUNT
<C>            <S>                                                <C>
- -----------

SHORT-TERM INVESTMENT (3.1%)
  REPURCHASE AGREEMENT (3.1%)
$     7,736    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                 4/01/99, to be repurchased at $7,737,
                 collateralized by U.S. Treasury Bonds, 7.125%
                 due 2/15/23, valued at $7,796 (Cost $7,736)....        7,736
                                                                  -----------
FOREIGN CURRENCY (0.5%)
    AUD 363    Australian Dollar................................          230
    GBP 167    British Pound....................................          269
    EUR 391    European Monetary Unit...........................          423
 JPY 22,444    Japanese Yen.....................................          190
                                                                  -----------
TOTAL FOREIGN CURRENCY (Cost $1,101)............................        1,112
                                                                  -----------
TOTAL INVESTMENTS (99.7%) (Cost $267,175).......................      249,199
                                                                  -----------
</TABLE>

<TABLE>
<S>                                                                <C>
OTHER ASSETS AND LIABILITIES (0.3%)
  Other Assets...................................................       2,796
  Liabilities....................................................      (2,011)
                                                                   ----------
                                                                          785
                                                                   ----------
NET ASSETS (100%)................................................  $  249,984
                                                                   ----------
                                                                   ----------
</TABLE>

<TABLE>
<S>                                                             <C>
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 16,105,040 outstanding $0.001 par value shares
  (authorized 1,000,000,000 shares)...........................     $15.52
                                                                ---------
                                                                ---------
</TABLE>

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

NCS   --  Non-Convertible Shares

- --------------------------------------------------------------------------------
International Small Cap Portfolio

                                       56
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
JAPANESE EQUITY PORTFOLIO

The investment objective of the Japanese Equity Portfolio is to seek long-term
capital appreciation by investing primarily in equity securities of Japanese
issuers. Equity securities are defined as common and preferred stocks,
convertible securities and rights and warrants to purchase common stocks.

For the three months ended March 31, 1999, the Portfolio had a total return of
11.83% for the Class A shares and 11.58% for the Class B shares as compared to
12.18% for the Morgan Stanley Capital International (MSCI) Japan Index (the
"Index"). For the one-year period ended March 31, 1999, the Portfolio had a
total return of 18.08% for the Class A shares and 17.48% for the Class B shares
compared to 15.49% for the Index. From inception on April 25, 1994 through March
31, 1999, the average annual total return of Class A shares was 0.60% compared
to -4.91% for the Index. From inception on January 2, 1996 through March 31,
1999, the average annual total return of Class B shares was 2.23% compared to
- -7.89% for the Index.

PERFORMANCE COMPARED TO MORGAN STANLEY CAPITAL INTERNATIONAL (MSCI) JAPAN
INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                          TOTAL RETURNS(2)
                             ------------------------------------------
                                             ONE       AVERAGE ANNUAL
                                YTD         YEAR       SINCE INCEPTION
                             ----------  -----------  -----------------
<S>                          <C>         <C>          <C>
PORTFOLIO -- CLASS A.......      11.83%       18.08%          0.60%
PORTFOLIO -- CLASS B.......      11.58        17.48           2.23
INDEX -- CLASS A...........      12.18        15.49          -4.91
INDEX -- CLASS B...........      12.18        15.49          -7.89
</TABLE>

1. The MSCI Japan Index is an unmanaged index of common stocks (includes
   dividends).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK
CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

The Japanese equity market rallied during the first quarter, particularly during
March as investors began re-evaluating their allocation to Japanese equities.
The Bank of Japan sent a subtle message in January yen intervention at 110 level
suggesting authorities did not desire a strong currency, which also seemed to be
supported during the G7 Bonn Summit in February. Yields on 10-year Japanese
Government Bonds (JGB) rose rapidly during the beginning of the year owing to
fears of huge supply coming to the market with deficit spending substantially
increasing in a weak economic environment. To stem this rise the Bank of Japan
guided the overnight call rate to "0" and the Ministry of Finance's Trust Fund
Bureau announced they will continue to purchase JGB's in a reversal of previous
statements. Both of these developments were viewed positively by investors
because Government authorities acted quickly and decisively to calm market
volatility.

In addition, the Government's proposal to provide Y7.4 trillion of public funds
for Japanese banks' non-performing loans was officially approved after
considerable debate. Under this scheme banks will issue preference shares to the
Japanese Government to write off non-performing loans and in turn these banks
are expected to comply with the FSA (Financial Supervisory Authority) for
disclosure of non-performing loans as well as definitive measures to improve
profitability. Furthermore, to alleviate the credit crunch for medium to smaller
companies the Government's Y20 trillion loan guarantee program enacted in 1998
became available should these companies require such credit. With the above
mentioned factors investors became increasingly convinced that many of Japan's
recent credit and non-performing loan problems were sufficiently addressed by
the authorities and sentiment regarding investments in Japan greatly improved.

At the same, time full scale restructuring efforts seemed to make daily
headlines on a micro level; NEC, Sony, Mitsubishi Chemical and numerous other
leading private sector companies declared unprecedented labor, production and
management changes which focused on return on equity over market share. Highly
insular companies such as Nissan and Sumitomo Rubber also departed from their
traditional "keiretsu" relationships to announce major tie-ups with foreign
companies. At the margin all these changes were viewed positively and evidence
to this was the record Y1.8 trillion worth of equities purchased by foreign
investors during March.

While domestic Japanese institutional and corporate investors were largely
inactive or net sellers during the quarter preparing for their fiscal year-end
in March, Japanese retail investors returned to the

- --------------------------------------------------------------------------------
                                                       Japanese Equity Portfolio

                                       57
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
JAPANESE EQUITY PORTFOLIO (CONT.)

market. Record consecutive rises in the OTC Index as well as heavily
oversubscribed IPO's suggested that many have made money in the markets and
contributed to the improvement of overall market sentiment and volume of trading
activity. In addition, the NY Dow reached record highs during the quarter which
also added momentum to the buying frenzy during March.

OUTLOOK
As we stated in our outlook earlier in the year, we believe 1999 will be
remembered as an important milestone for long term investors in Japanese
equities. Restructuring on a micro level appears to be real while authorities
have provided a "put option" for Japanese banks in the form of public funds and
issuance of preference shares. A "V" shaped economic recovery is highly unlikely
given the weak domestic Japanese macro activity and rising unemployment.
However, it is evident to us that corporate earnings will rebound as return on
equity improves with these restructuring efforts. Importantly, we believe there
will likely be some short-term disappointments when restructuring erodes
short-term profitability and the markets therefore become subject to corrections
as investors realize that momentum may have carried the market ahead of economic
reality. We believe that the light at the end of the ten year depressed economy
will likely shine for Japanese consumer technology industries such as Sony's new
Playstation II which may in time become a "home server" for numerous
applications and fuel new consumer demand for Japanese consumer related
products.

We have sold our positions in Tokyo Electron and Murata during the quarter. Both
securities have reached our valuation targets and departed in the cheapest 1/3
of our valuation screens for price/book ratio, price/cash flow ratio and
price/earnings ratio and we have used proceeds to add to our existing positions
in Toshiba, Mineabea, Sony and Ono Pharmaceuticals based on their relative
attractive valuations.

John R. Alkire
PORTFOLIO MANAGER

Kunihiko Sugio
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Japanese Equity Portfolio

                                       58
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

JAPANESE EQUITY PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                      VALUE
   SHARES                                                             (000)
<C>              <S>                                                <C>
- -----------------------------------------------------------------------------

COMMON STOCKS (94.4%)
  APPLIANCES & HOUSEHOLD DURABLES (6.6%)
       85,000    Matsushita Electric Industrial Co., Ltd..........  $   1,658
       20,000    Sony Corp........................................      1,850
                                                                    ---------
                                                                        3,508
                                                                    ---------
  AUTOMOBILES (7.5%)
       70,000    Nifco, Inc.......................................        660
      338,000    Nissan Motor Co., Ltd............................      1,313
       70,000    Suzuki Motor Co., Ltd............................        929
       37,000    Toyota Motor Corp................................      1,072
                                                                    ---------
                                                                        3,974
                                                                    ---------
  BROADCASTING & PUBLISHING (0.8%)
       60,000    Nissha Printing Co., Ltd.........................        406
                                                                    ---------
  BUILDING MATERIALS & COMPONENTS (4.4%)
       90,000    Fujitec Co., Ltd.................................        731
       25,000    Rinnai Corp......................................        503
      100,000    Sanwa Shutter Corp...............................        515
       82,000    Sekisui Chemical Co..............................        584
                                                                    ---------
                                                                        2,333
                                                                    ---------
  BUSINESS & PUBLIC SERVICES (2.0%)
       69,000    Dai Nippon Printing Co., Ltd.....................      1,049
                                                                    ---------
  CHEMICALS (5.3%)
      171,000    Daicel Chemical Industries Ltd...................        563
      140,000    Kaneka Corp......................................      1,111
      218,000    Mitsubishi Chemical Corp.........................        619
       90,000    Shin-Etsu Polymer Co., Ltd.......................        517
                                                                    ---------
                                                                        2,810
                                                                    ---------
  CONSTRUCTION & HOUSING (1.1%)
       57,000    Sekisui House Co.,Ltd............................        607
                                                                    ---------
  DATA PROCESSING & REPRODUCTION (8.9%)
       60,000    Canon, Inc.......................................      1,485
      110,000    Fujitsu Ltd......................................      1,767
      141,000    Ricoh Co., Ltd...................................      1,473
                                                                    ---------
                                                                        4,725
                                                                    ---------
  ELECTRICAL & ELECTRONICS (13.9%)
      208,000    Hitachi Ltd......................................      1,541
       75,000    Mineabea Co., Ltd................................        775
       54,000    Mitsumi Electric Co., Ltd........................      1,081
      140,000    NEC Corp.........................................      1,685
       36,000    Ryosan Co........................................        586
      253,000    Toshiba Corp.....................................      1,728
                                                                    ---------
                                                                        7,396
                                                                    ---------
  ELECTRONIC COMPONENTS, INSTRUMENTS (6.8%)
       21,000    Kyocera Corp.....................................      1,131
        8,000    Rohm Co..........................................        956
       19,000    TDK Corp.........................................      1,539
                                                                    ---------
                                                                        3,626
                                                                    ---------

<CAPTION>

                                                                      VALUE
   SHARES                                                             (000)
<C>              <S>                                                <C>
- -----------------------------------------------------------------------------

  ENERGY EQUIPMENT & SERVICES (1.3%)
       44,000    Kurita Water Industries Ltd......................  $     720
                                                                    ---------
  FINANCIAL SERVICES (1.8%)
       49,000    Hitachi Credit Corp..............................        972
                                                                    ---------
  FOOD & HOUSEHOLD PRODUCTS (3.2%)
       24,000    Aiwa Co., Ltd....................................        553
       16,000    Sangetsu Co., Ltd................................        257
       84,000    Yamaha Corp......................................        890
                                                                    ---------
                                                                        1,700
                                                                    ---------
  HEALTH & PERSONAL CARE (8.0%)
       34,000    Ono Pharmaceutical Co., Ltd......................      1,373
       69,000    Sankyo Co., Ltd..................................      1,480
       45,000    Yamanouchi Pharmaceutical Co., Ltd...............      1,425
                                                                    ---------
                                                                        4,278
                                                                    ---------
  INDUSTRIAL COMPONENTS (1.2%)
      150,000    Furukawa Electric Co.............................        621
                                                                    ---------
  MACHINERY & ENGINEERING (8.0%)
       73,000    Amada Co., Ltd...................................        388
       60,000    Daifuku Co., Ltd.................................        398
       53,000    Daikin Industries Ltd............................        525
       43,000    Fuji Machine Manufacturing Co., Ltd..............      1,544
      243,000    Mitsubishi Heavy Industries Ltd..................      1,098
      130,000    Tsubakimoto Chain Co.............................        302
                                                                    ---------
                                                                        4,255
                                                                    ---------
  MERCHANDISING (1.1%)
       12,000    FamilyMart Co., Ltd..............................        609
                                                                    ---------
  MULTI-INDUSTRY (0.9%)
       50,000    Lintec Corp......................................        486
                                                                    ---------
  REAL ESTATE (1.7%)
       87,000    Mitsubishi Estate Co., Ltd.......................        885
                                                                    ---------
  RECREATION, OTHER CONSUMER GOODS (7.0%)
       91,000    Casio Computer Co................................        617
       37,000    Fuji Photo Film Ltd..............................      1,400
       20,000    Nintendo Corp., Ltd..............................      1,726
                                                                    ---------
                                                                        3,743
                                                                    ---------
  TELECOMMUNICATIONS (2.9%)
          155    Nippon Telegraph & Telephone Corp................      1,519
                                                                    ---------
TOTAL COMMON STOCKS (Cost $46,928)................................     50,222
                                                                    ---------
</TABLE>

- --------------------------------------------------------------------------------
                                                       Japanese Equity Portfolio

                                       59
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

JAPANESE EQUITY PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
    FACE
   AMOUNT                                                             VALUE
    (000)                                                             (000)
<C>              <S>                                                <C>
- -----------------------------------------------------------------------------

SHORT-TERM INVESTMENT (5.2%)
  REPURCHASE AGREEMENT (5.2%)
$       2,768    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                   4/01/99, to be repurchased at $2,768,
                   collateralized by U.S. Treasury Bonds, 10.375%
                   due 11/15/12, valued at $2,849 (Cost $2,768)...  $   2,768
                                                                    ---------
TOTAL INVESTMENTS (99.6%) (Cost $49,696)..........................     52,990
                                                                    ---------
</TABLE>

<TABLE>
<S>                                                                  <C>
OTHER ASSETS AND LIABILITIES (0.4%)
  Other Assets.....................................................    15,357
  Liabilities......................................................   (15,166)
                                                                     --------
                                                                          191
                                                                     --------
NET ASSETS (100%)..................................................  $ 53,181
                                                                     --------
                                                                     --------
</TABLE>

<TABLE>
<CAPTION>
                                                                      VALUE
                                                                      (000)
<S>                                                                  <C>
- -----------------------------------------------------------------------------
CLASS A:
NET ASSETS.........................................................  $ 51,817
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
Applicable to 7,511,647 outstanding $0.001 par value shares
  (authorized, 500,000,000 shares).................................  $   6.90
                                                                     --------
                                                                     --------
CLASS B:
NET ASSETS.........................................................  $  1,364
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
Applicable to 199,420 outstanding $0.001 par value shares
  (authorized 500,000,000 shares)..................................  $   6.84
                                                                     --------
                                                                     --------
</TABLE>

- --------------------------------------------------------------------------------
Japanese Equity Portfolio

                                       60
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
LATIN AMERICAN PORTFOLIO

The investment objective of the Latin American Portfolio is long-term capital
appreciation through investment primarily in equity securities of Latin American
issuers. The Portfolio may also invest in debt securities issued or guaranteed
by a Latin American government or governmental entity.

For the three months ended March 31, 1999, the Portfolio had a total return of
17.06% for the Class A shares and 16.96% for the Class B shares compared to a
total return of 15.69% for the Morgan Stanley Capital International (MSCI)
Emerging Markets Global Latin America Index (the "Index"). For the one-year
period ended March 31, 1999, the Portfolio had a total return of -29.03%, for
the Class A shares and -28.78% for the Class B shares compared to -25.27% for
the Index. From inception on January 18, 1995 through March 31, 1999, the
average annual total return of Class A Shares was 8.58% compared to 2.42% for
the Index. From inception on January 2, 1996 through March 31, 1999, the average
annual total return of Class B Shares was 12.77% compared to 5.07% for the
Index.

PERFORMANCE COMPARED TO MORGAN STANLEY CAPITAL INTERNATIONAL (MSCI) EMERGING
MARKETS GLOBAL LATIN AMERICA INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                     TOTAL RETURNS(2)
                        -------------------------------------------
                                        ONE        AVERAGE ANNUAL
                           YTD         YEAR       SINCE INCEPTION
                        ----------  -----------  ------------------
<S>                     <C>         <C>          <C>
PORTFOLIO -- CLASS
 A....................      17.06%      -29.03%           8.58%
PORTFOLIO -- CLASS
 B....................      16.96       -28.78           12.77
INDEX -- CLASS A......      15.69       -25.27            2.42
INDEX -- CLASS B......      15.69       -25.27            5.07
</TABLE>

1. The MSCI Emerging Markets Global Latin America Index is a broad based market
   cap weighted composite index covering at least 60% of markets in Argentina,
   Brazil, Chile, Colombia, Mexico, Peru and Venezuela (includes dividends).

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE COUNTRY SPECIFIC PERFORMANCE
RESULTS PROVIDED IN THIS OVERVIEW ARE AS MEASURED BY THE MSCI EMERGING MARKETS
COUNTRY OR REGIONAL INDICES, ARE FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT
BE CONSTRUED AS A GUARANTEE OF THE PORTFOLIO'S FUTURE PERFORMANCE. PAST
PERFORMANCE SHOWN IS NOT PREDICTIVE OF FUTURE PERFORMANCE. INVESTMENT RETURN AND
PRINCIPAL VALUE WILL FLUCTUATE SO THAT AN INVESTOR'S SHARES, WHEN REDEEMED, MAY
BE WORTH MORE OR LESS THAN THEIR ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A
DESCRIPTION OF CERTAIN RISK CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL
INVESTING.

Outperformance relative to the Index was largely attributable to our Mexican
positions. Overweighting the country was favorable, as Mexico was the best
performing Latin market during the quarter gaining 29.9%. Additionally, our
Mexican stock selection was strong. Underweighting Colombia (-14.2%) and
Venezuela (-13.3%) also helped performance. Less favorable was our stock
selection in Brazil and Chile.

The first quarter of 1999 was the watershed for the Latin markets. Characterized
by strong performance, the turning point in the markets occurred with the
devaluation of the Brazilian real. On January 21, the Brazilian authorities
abandoned the currency peg that was put in place in mid 1994. With dollar
reserves plummeting daily, pressure from capital flight had become too great.

The Brazilian devaluation had long been expected and much of the risk premium
attached to such an event had been priced into the market. Consequently, with
this event behind it, the market looked forward to a more encouraging future
both for Brazil and the region as a whole. Many observers were amazed to see the
Brazilian equity market gain 5.5% in U.S. dollars over the quarter. However, in
the weeks after the devaluation, the Brazilian government took decisive action
to ensure new, strong management of the central bank as well as aggressively
passing measures through congress that were essential in achieving the primary
fiscal targets agreed upon with the IMF.

With regard to the central bank, Arminio Fraga, former portfolio manager for
Soros Funds Management's Quantum Emerging Growth Fund was appointed as its head.
Fraga offers financial expertise and a more reliable currency management
technique. The move was taken to be so positive that most foreign banks with
Brazilian exposure decided to roll over most of their credit to Brazilian
institutions and in addition, welcomed the notion of a sovereign bond issue.
These developments ensured that confidence both domestically and externally
improved dramatically. Inflation has remained surprisingly subdued and the
currency has rallied off its lows.

We are confident that Brazil has avoided insolvency in the near-term and are
more optimistic on the country's ability to avoid debt default over time.
However, Brazil's continued solvency will be contingent upon the government's
ability to keep real interest rates low (sub 15%) and the primary fiscal

- --------------------------------------------------------------------------------
                                                        Latin American Portfolio

                                       61
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
LATIN AMERICAN PORTFOLIO (CONT.)

surplus high (above 3% GDP). Should the government achieve this, the growth in
the stock of public debt (now at 49% GDP) will be contained and the debt
restructuring avoided. To ensure that rates do remain low, congress and the
executive (President Cardoso and his cabinet) must be seen to be acting
responsibly. Legislation must pass that allows for social security system and
tax reforms. We do want to point out that none of these measures are necessary
for the government to achieve their fiscal targets with the IMF for this year.
They are important however for the longer-term health of the economy, and hence
guide market sentiment.

Over the course of the quarter, we have added to our Brazilian exposure and are
now overweight the Index. Within Brazil, we are focusing on the
telecommunications industry that offers strong management, high pent-up demand,
and room for cost efficiencies. Telebras is one such example. Telebras was the
former holding company for the Brazilian telecommunications sector. The company
was privatized during the past summer, and split into 12 separate companies.
Through the purchase of the aggregated Telebras security, we are able to tap
into all 12 companies, taking advantage of reduced transaction charges and
increased liquidity. Telebras offers a great potential for revenue growth and
significant margin expansion.

While Mexico performed as poorly as Brazil in 1998, its strong economic
position, coupled with increasing oil prices, have allowed Mexico to
differentiate itself from the rest of Latin America in the first quarter of
1999. The strength in oil prices has removed any constraints that were weighing
on the government's fiscal balance and consistently lower than expected
inflation allowed the peso to rally 7% in real terms. Given its better than
expected economy, stronger currency and lower domestic interest rates, dollar
earnings estimates for Mexico were revised upwards, providing a further boost to
the market.

Within Mexico, we are focusing on consumer-related industries, such as
telecommunications, broadcasting and publishing, beverages, retailing, and
health and personal care. Telmex, one of our holdings, is an integrated
telecommunications provider for Mexico. The company offers excellent management
which focuses on profitability, ensuring the enhancement of shareholder value.
We also own Televisa, the largest media conglomerate in Mexico, which includes a
television network, publishing, radio and music companies. Televisa offers a
favorable combination of cost reductions, ratings momentum and improved
management focus. Upside exists for tariff increases as advertising rates in
Mexico are among the cheapest in the world.

Argentina's market lagged, gaining only 4.7% during the quarter. We are
underweight Argentina owing to potential internal and external risks. Endogenous
risks include election year uncertainties, as a new President will come into
power in October, a deteriorating current account, and the economy's direct link
to Brazil. While Brazil has been improving, any set back will hinder Argentina's
progress. Exogenous risks include a weak commodity cycle and a rise in U.S.
interest rates. Within Argentina, we are invested in the energy sector,
specifically YPF, the country's largest integrated oil and gas company, and in
the telecommunications sector.

Chile's market rose 16.3%, largely driven by an interest rate cut, increased
demand for pulp from Asian markets, and a critical change in company by-laws for
energy-giant Enersis. We are underweight Chile given its slowing economy and
lackluster corporate earnings. Chile's lack of export diversification has
hindered it economically given the country's dependence on commodities.
Specifically, weak copper prices remain a concern.

Turning to other countries, domestic factors including high interest rates,
inflation and a slowing economy have resulted in our Colombian underweight. We
are also underweight Peru and Venezuela. Peru, like Chile, is highly commodity
dependent (particularly copper) and thus has been negatively impacted by low
commodity prices. Concerns regarding Venezuela include uncertainty over
President Chavez' policies, its oil price dependence, and prospects of a
currency devaluation.

Robert L. Meyer
PORTFOLIO MANAGER

Andy B. Skov
PORTFOLIO MANAGER

Michael L. Perl
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Latin American Portfolio

                                       62
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

LATIN AMERICAN PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                    VALUE
   SHARES                                                           (000)
<C>             <S>                                                <C>
- ---------------------------------------------------------------------------

COMMON STOCKS (97.3%)
  ARGENTINA (11.0%)
      17,712    Perez Companc, Class B...........................  $     83
      44,285    Quilmes Industrial ADR...........................       418
      18,281    Telecom Argentina ADR............................       502
      10,622    Telefonica de Argentina ADR......................       321
      27,710    YPF ADR..........................................       875
                                                                   --------
                                                                      2,199
                                                                   --------
  BRAZIL (35.4%)
  11,847,000    Banco Nacional (Preferred).......................        --
  11,891,386    CEMIG (Preferred)................................       266
      18,864    CEMIG ADR (Preferred)............................       420
 (e)   1,275    CEMIG ADR (Preferred)............................        28
 683,074,000    Cia Electric Est Rio Janeiro.....................       155
   6,193,000    Cia Siderurgica Nacional.........................       105
   1,820,177    CRT (Preferred)..................................       552
       5,000    CVRD.............................................        53
      34,986    CVRD (Bonus Shares)..............................        --
      13,175    CVRD ADR (Preferred).............................       193
      29,233    CVRD, Class A (Preferred)........................       430
      30,790    Copel ADR (Preferred)............................       231
  46,915,400    Copel, Class B ADR (Preferred)...................       354
     603,830    Coteminas........................................        34
       9,105    Coteminas ADR....................................        27
   4,654,000    Eletrobras.......................................        91
   5,564,000    Eletrobras, Class B (Preferred)..................       117
  23,982,000    Embratel.........................................       403
  10,100,532    Gerdau (Preferred)...............................       104
       5,000    Globex Utilidades (Preferred)....................        18
     389,175    Itaubanco (Preferred)............................       199
     208,900    Iven (Preferred).................................        22
  10,009,300    Lojas Arapua (Preferred).........................        --
      13,460    Lojas Arapua ADR (Preferred).....................        --
   5,889,000    Petrobras (Preferred)............................       817
       4,933    Petrobras ADR (Preferred)........................        69
   5,153,000    Renner Participacoes.............................         4
      49,299    Rossi GDR........................................        43
     101,175    Rossi GDS........................................        89
  20,882,275    Tele Celular Sul (Preferred).....................        42
  23,363,675    Tele Centro Sul..................................       218
 132,328,000    Tele Leste Celular (Preferred)...................        88
  77,455,600    Tele Nordeste Celular (Preferred)................        84
 128,532,000    Tele Norte Celular (Preferred)...................        77
  33,435,000    Tele Norte Leste (Preferred).....................       511
  14,478,275    Tele Sudeste Celular (Preferred).................        59
       3,890    Tele Sudeste Celular ADR.........................        79
  32,144,275    Telebras (Preferred).............................         5
       7,447    Telebras ADR (Preferred).........................       600
       3,921    Telenorte Leste (ADR)............................        60
  13,868,275    Telesp Celular (Preferred).......................       116
         550    Teleste Celular ADR..............................        18

<CAPTION>

                                                                    VALUE
   SHARES                                                           (000)
<C>             <S>                                                <C>
- ---------------------------------------------------------------------------

      13,173    Unibanco GDR (Preferred).........................  $    254
      20,150    Usiminas.........................................        34
                                                                   --------
                                                                      7,069
                                                                   --------
  CHILE (9.0%)
       3,840    Banco Edwards ADR................................        44
       3,180    Banco Santander ADR..............................        48
       2,478    Banco Santiago ADR...............................        44
       9,505    CCU ADR..........................................       207
      17,797    Chilectra ADR....................................       382
      17,865    Cia. De Telecomunicaciones de Chile ADR..........       421
       6,316    D&S ADR..........................................        78
      17,903    Endesa ADR.......................................       252
       6,468    Enersis ADR......................................       173
       8,245    Quinenco ADR.....................................        82
       8,063    Santa Isabel ADR.................................        70
                                                                   --------
                                                                      1,801
                                                                   --------
  COLOMBIA (0.4%)
      13,621    Bavaria..........................................        60
      22,318    Valores Bavaria..................................        23
                                                                   --------
                                                                         83
                                                                   --------
  MEXICO (39.5%)
      45,907    Alfa, Class A....................................       139
      32,531    Banacci, Class B.................................        70
      78,246    Banacci, Class L.................................       157
     443,043    Bancomer, Class B................................       152
     118,138    Banorte, Class B.................................       155
      53,971    Carso Global Telecom.............................       280
      69,215    Carso, Class A1..................................       284
      55,880    Cemex CPO........................................       228
      26,120    Cemex CPO ADR....................................       212
      51,529    Cemex, Class B...................................       216
      43,584    Cemex, Class B ADR...............................       365
     233,731    Cifra, Class C...................................       361
      22,071    Cifra, Class V...................................        35
       1,960    Cifra, Class V ADR...............................        30
      21,187    Femsa ADR........................................       656
      31,361    Femsa (Units)....................................        96
      53,656    Grupo Industrial Bimbo, Class A..................       120
      74,253    Grupo Modelo, Class C............................       190
     186,761    Kimberly-Clark, Class A..........................       704
      88,357    Soriana, Class B.................................       306
      15,613    Tamsa ADR........................................       141
      25,037    Televisa CPO GDR.................................       786
      31,258    Telmex, Class L ADR..............................     2,047
       8,212    TV Azteca ADR....................................        51
      19,843    Vitro ADR........................................       115
                                                                   --------
                                                                      7,896
                                                                   --------
  PERU (1.1%)
      17,426    Tel Peru, Class B ADR............................       222
                                                                   --------
</TABLE>

- --------------------------------------------------------------------------------
                                                        Latin American Portfolio

                                       63
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

LATIN AMERICAN PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                    VALUE
   SHARES                                                           (000)
- ---------------------------------------------------------------------------
<C>             <S>                                                <C>
  VENEZUELA (0.9%)
      10,225    CANTV ADR........................................  $    186
                                                                   --------
TOTAL COMMON STOCKS (Cost $21,312)...............................    19,456
                                                                   --------
</TABLE>

<TABLE>
<CAPTION>
    FACE
   AMOUNT
   (000)
<C>             <S>                                                <C>
- ------------

SHORT-TERM INVESTMENT (1.9%)
  REPURCHASE AGREEMENT (1.9%)
$        372    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                  4/01/99, to be repurchased at $372,
                  collateralized by U.S. Treasury Bonds, 8.875%,
                  due 8/15/17, valued at $375 (Cost $372)........       372
                                                                   --------
FOREIGN CURRENCY (0.0%)
    ARP    1    Argentine Peso...................................         1
   BRL     4    Brazilian Real...................................         2
    MXP   15    Mexican Peso.....................................         2
                                                                   --------
TOTAL FOREIGN CURRENCY (Cost $4).................................         5
                                                                   --------
TOTAL INVESTMENTS (99.2%) (Cost $21,688).........................    19,833
                                                                   --------
</TABLE>

<TABLE>
<S>                                                                 <C>
OTHER ASSETS AND LIABILITIES (0.8%)
  Other Assets....................................................      376
  Liabilities.....................................................     (213)
                                                                    -------
                                                                        163
                                                                    -------
NET ASSETS (100%).................................................  $19,996
                                                                    -------
                                                                    -------
</TABLE>

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------
CLASS A:
- --------------------------------------------------------------
<S>                                                             <C>
NET ASSETS....................................................  $18,723
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 2,372,769 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................    $7.89
                                                                -------
                                                                -------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................   $1,273
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 160,629 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................    $7.93
                                                                -------
                                                                -------
</TABLE>

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

(e)   --  144A Security -- certain conditions for public sale may exist.
ADR   --  American Depositary Receipt
CPO   --  Certificate of Participation
GDR   --  Global Depositary Receipt
GDS   --  Global Depositary Shares

- --------------------------------------------------------------------------------
Latin American Portfolio

                                       64
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
AGGRESSIVE EQUITY PORTFOLIO

The Aggressive Equity Portfolio seeks capital appreciation through a
concentrated, non-diversified portfolio of corporate equity and equity-linked
securities. Short sales and options can be used to enhance performance.

PERFORMANCE COMPARED TO THE S&P 500 INDEX(1) AND THE LIPPER CAPITAL APPRECIATION
INDEX
- -----------------------------------------

<TABLE>
<CAPTION>
                                        TOTAL RETURNS(2)
                           ------------------------------------------
                                                     AVERAGE ANNUAL
                              YTD       ONE YEAR    SINCE INCEPTION
                           ----------  ----------  ------------------
<S>                        <C>         <C>         <C>
PORTFOLIO -- CLASS A.....      13.09%      10.37%          35.71%
PORTFOLIO -- CLASS B.....      13.05       10.08           31.27
S&P 500 INDEX -- CLASS
 A.......................       4.98       18.45           29.74
LIPPER CAPITAL
 APPRECIATION INDEX --
 CLASS A.................       4.80       11.50           21.35
S&P 500 INDEX -- CLASS
 B.......................       4.98       18.45           18.38
LIPPER CAPITAL
 APPRECIATION INDEX --
 CLASS B.................       4.80       11.50           27.45
</TABLE>

1. The S&P 500 Index is a stock index comprised of 500 large-cap U.S. companies
   with market capitalization of $1 billion or more. These 500 companies are a
   representative sample of some 100 industries chosen mainly for market size,
   liquidity and industry group representation. The Lipper Capital Appreciation
   Index is a composite of mutual funds managed for maximum capital gains.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

- ------------------------------------------------------------
THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PORTFOLIO'S CONCENTRATION OF ITS
ASSETS IN A SMALL NUMBER OF ISSUERS AND ITS USE OF EQUITY-LINKED SECURITIES WILL
SUBJECT IT TO GREATER RISKS. THE PERFORMANCE RESULTS PROVIDED ARE FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF THE
PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST.

For the three months ended March 31, 1999, the Portfolio had a total return of
13.09% for the Class A shares and 13.05% for the Class B shares compared to a
total return of 4.98% for the S&P 500 Index and 4.80% for the Lipper Capital
Appreciation Index. For the one-year period ended March 31, 1999, the Portfolio
had a total return of 10.37% for the Class A shares and 10.08% for the Class B
shares compared to a total return of 18.45% for the S&P 500 Index and 11.50% for
the Lipper Capital Appreciation Index. From inception on March 8, 1995 through
March 31, 1999, the average annual total return of Class A shares was 35.71%
compared to 29.74% for the S&P 500 Index and 21.35% for the Lipper Capital
Appreciation Index. From inception on January 2, 1996 through March 31, 1999,
the average annual total return of Class B shares was 31.27% compared to 18.38%
for the S&P 500 Index and 27.45% for the Lipper Capital Appreciation Index.

Outperformance for the quarter was driven by Montana Power (up 30% in the first
quarter), Ntl Inc., Neilsen Media Research and Amgen. The largest detractors to
performance were Loews Corp., 3Com Corp, Compaq and Forest Labs, which have all
been eliminated in the Portfolio.

The Portfolio and its top ten holdings reflect a balance of classic growth
stocks and less traditional growth opportunities including:

<TABLE>
<CAPTION>
COMPANY                                          %
- -------------------------------------------  ---------
<S>                                          <C>
Tyco                                               6.6
Associated Group                                   6.2
AT&T Corp.-Liberty Media                           5.8
United Technologies                                5.6
General Electric                                   4.8
Cisco                                              4.6
Amgen                                              4.5
Pitney Bowes                                       4.3
MCI Worldcom                                       4.0
Abercrombie & Fitch                                4.0
</TABLE>

The 49% weighting in our top ten positions illustrates our strategy of
"opportunistic concentration". Our belief is that heavy concentration may lead
to greater than average volatility but not necessarily greater than average
risk. To us, risk is synonymous with lack of knowledge, which our strategy of
"seeking the information edge" endeavours to avoid.

Tyco (our largest holding) closed its AMP acquisition on April 2. This should be
a materially additive acquisition and a platform from which we expect the
company to make additional accretive acquisitions. The integration of U.S.
Surgical is ahead of plan. We expect a combination of organic growth and
strategic actions (further acquisitions as well as selective divestitures) to
lead to significant earnings growth (at least 30% for the foreseeable future).

We have elected to participate in the dynamic growth of the internet through a
combination of content and infrastructure providers. AT&T Corp.-Liberty Media,
led by industry visionary John Malone, is a unique portfolio of investments in
the rapidly growing cable programming sector along with opportunistic
investments in the internet

- --------------------------------------------------------------------------------
                                                     Aggressive Equity Portfolio

                                       65
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
AGGRESSIVE EQUITY PORTFOLIO (CONT.)

world. Liberty actively manages its investment portfolio in a very tax-efficient
and shareholder-friendly manner. In addition to owning a stock which trades
below the value of its publicly listed investments, we believe we own a free
call on well-positioned "private" investments and John Malone's ability to
strategically invest billions of dollars.

On the infrastructure side MCI Worldcom has emerged as the leading global data
company. In 1998 global data traffic exceeded voice traffic, and is growing at
25% per year. The exponential growth of the internet has led businesses and
internet service providers to demand global end-to-end communication links that
carry voice, data and internet traffic. MCI Worldcom data revenues are growing
at 45% per year and in 1999 will comprise 37% of total revenues. MCI Worldcom's
on-net business model (global facilities-based end-to-end services) offer
compelling economics. For example, European PTT's currently charge is about
$18,000 per month for an E-1 circuit (a 2 million bit per second dedicated
connection) between London and Frankfurt. With its on-net economics MCI Worldcom
can profitably offer the same service for $600 per month -- thus driving market
share gains and stimulating demand with lower prices.

Finally we remain very enthusiastic about our third largest holding, United
Technologies. Earnings quality is high, cash flow is strong and acquisitions are
now a focal point. Even with the stock's strong performance in 1998 (up almost
50%) and so far in 1999, we continue to believe the stock remains attractive,
selling at about 19 times year 2000 estimated earnings per share.

Philip W. Friedman
PORTFOLIO MANAGER

William S. Auslander
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Aggressive Equity Portfolio

                                       66
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

AGGRESSIVE EQUITY PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                  VALUE
 SHARES                                                           (000)
<C>          <S>                                                <C>
- -------------------------------------------------------------------------

COMMON STOCKS (98.0%)
  CAPITAL GOODS (24.8%)
     ELECTRICAL EQUIPMENT (4.7%)
   54,300    General Electric Co..............................  $   6,007
                                                                ---------
     MANUFACTURING (DIVERSIFIED) (15.8%)
   59,600    Textron, Inc.....................................      4,612
  115,000    Tyco International Ltd...........................      8,251
   52,000    United Technologies Corp.........................      7,043
                                                                ---------
                                                                   19,906
                                                                ---------
     OFFICE EQUIPMENT & SUPPLIES (4.3%)
   85,100    Pitney Bowes, Inc................................      5,425
                                                                ---------
  TOTAL CAPITAL GOODS.........................................     31,338
                                                                ---------
  COMMUNICATION SERVICES (12.6%)
     TELECOMMUNICATIONS (CELLULAR/WIRELESS) (6.2%)
   45,100    Associated Group, Inc., Class A..................      2,235
  114,700    Associated Group, Inc., Class B..................      5,563
                                                                ---------
                                                                    7,798
                                                                ---------
     TELECOMMUNICATIONS (LONG DISTANCE) (2.5%)
   40,049    AT&T Corp........................................      3,197
                                                                ---------
     TELEPHONE (3.9%)
   56,100    MCI Worldcom, Inc................................      4,968
                                                                ---------
  TOTAL COMMUNICATION SERVICES................................     15,963
                                                                ---------
  CONSUMER CYCLICALS (15.6%)
     RETAIL (BUILDING SUPPLIES) (1.7%)
   35,000    Home Depot, Inc..................................      2,179
                                                                ---------
     RETAIL (GENERAL MERCHANDISE) (2.4%)
   33,500    Costco Companies Inc.............................      3,067
                                                                ---------
     RETAIL (SPECIALTY) (6.5%)
   54,800    Abercrombie & Fitch Co., Class A.................      5,041
   46,050    Gap, Inc.........................................      3,100
                                                                ---------
                                                                    8,141
                                                                ---------
     SERVICES (ADVERTISING/MARKETING) (1.6%)
   68,100    Outdoors Systems, Inc............................      2,043
                                                                ---------
     SERVICES (COMMERCIAL & CONSUMER) (3.4%)
  170,700    Nielsen Media Research, Inc......................      4,214
                                                                ---------
  TOTAL CONSUMER CYCLICALS....................................     19,644
                                                                ---------
  CONSUMER STAPLES (10.3%)
     BROADCASTING (TV, RADIO, CABLE) (9.6%)
  139,500    AT&T-Liberty Media Corp., Class A................      7,341
   16,300    Chancellor Media Corp............................        768
   60,000    Clear Channel Communications, Inc................      4,024
                                                                ---------
                                                                   12,133
                                                                ---------

<CAPTION>

                                                                  VALUE
 SHARES                                                           (000)
<C>          <S>                                                <C>
- -------------------------------------------------------------------------

     FOODS (0.7%)
   24,500    Keebler Foods Co.................................  $     894
                                                                ---------
  TOTAL CONSUMER STAPLES......................................     13,027
                                                                ---------
  FINANCIAL (4.3%)
     BANKS (MAJOR REGIONAL) (1.0%)
   33,700    Bank of New York Co., Inc........................      1,211
                                                                ---------
     INSURANCE (LIFE & HEALTH) (1.2%)
   46,650    Reinsurance Group of America, Inc. (Non-
               Voting)........................................      1,580
                                                                ---------
     INSURANCE (MULTI-LINE) (2.1%)
   35,100    Loews Corp.......................................      2,620
                                                                ---------
  TOTAL FINANCIAL.............................................      5,411
                                                                ---------
  HEALTH CARE (12.9%)
     HEALTH CARE (DIVERSIFIED) (3.2%)
   61,700    Warner Lambert Co................................      4,084
                                                                ---------
     HEALTH CARE (DRUGS -- GENERIC & OTHERS) (4.5%)
   76,300    Amgen, Inc.......................................      5,713
                                                                ---------
     HEALTH CARE (DRUGS -- MAJOR PHARMS) (3.5%)
   17,300    Pfizer, Inc......................................      2,401
   35,800    Schering-Plough Corp.............................      1,980
                                                                ---------
                                                                    4,381
                                                                ---------
     HEALTH CARE (MEDICAL PRODUCTS & SUPPLIES) (1.7%)
   31,900    Bausch & Lomb, Inc...............................      2,073
                                                                ---------
  TOTAL HEALTH CARE...........................................     16,251
                                                                ---------
  TECHNOLOGY (13.6%)
     COMMUNICATION EQUIPMENT (2.0%)
  102,200    American Tower Corp., Class A....................      2,504
                                                                ---------
     COMPUTERS (NETWORKING) (4.6%)
   52,600    Cisco Systems, Inc...............................      5,763
                                                                ---------
     COMPUTERS (SOFTWARE & SERVICES) (4.3%)
   11,600    America Online, Inc..............................      1,694
   42,400    Microsoft Corp...................................      3,800
                                                                ---------
                                                                    5,494
                                                                ---------
     ELECTRONICS (DEFENSE) (1.0%)
   21,500    Litton Industries, Inc...........................      1,236
                                                                ---------
     EQUIPMENT (SEMICONDUCTORS) (1.7%)
   35,700    Applied Materials, Inc...........................      2,202
                                                                ---------
  TOTAL TECHNOLOGY............................................     17,199
                                                                ---------
  UTILITIES (3.9%)
     ELECTRIC COMPANIES (3.9%)
   66,300    Montana Power Co.................................      4,877
                                                                ---------
TOTAL COMMON STOCKS (Cost $103,072)...........................    123,710
                                                                ---------
</TABLE>

- --------------------------------------------------------------------------------
                                                     Aggressive Equity Portfolio

                                       67
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

AGGRESSIVE EQUITY PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
 FACE                                                           VALUE
AMOUNT                                                          (000)
<C>        <S>                                                <C>
- -----------------------------------------------------------------------

SHORT-TERM INVESTMENTS (1.2%)
  REPURCHASE AGREEMENT (1.2%)
$ 1,457    Chase Securities, Inc. 4.65%, dated 3/31/99, due
             4/01/99, to be repurchased at $1,457,
             collateralized by U.S. Treasury Bonds, 8.00%,
             due 11/15/21, valued at $1,492 (Cost $1,457)...  $   1,457
                                                              ---------
TOTAL INVESTMENTS (99.2%) (Cost $104,529)...................    125,167
                                                              ---------
</TABLE>

<TABLE>
<S>                                                          <C>
OTHER ASSETS AND LIABILITIES (0.8%)
  Other Assets.............................................       6,845
  Liabilities..............................................      (5,835)
                                                             ----------
                                                                  1,010
                                                             ----------
NET ASSETS (100%)..........................................  $  126,177
                                                             ----------
                                                             ----------
</TABLE>

<TABLE>
<CAPTION>
- --------------------------------------------------------------------------
CLASS A:
- --------------------------------------------------------------
<S>                                                             <C>
NET ASSETS....................................................    $108,462
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 5,480,745 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $19.79
                                                                ----------
                                                                ----------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $17,715
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 900,587 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $19.67
                                                                ----------
                                                                ----------
</TABLE>

- --------------------------------------------------------------------------------
Aggressive Equity Portfolio

                                       68
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EMERGING GROWTH PORTFOLIO

The Emerging Growth Portfolio invests primarily in growth-oriented equity
securities of small-to-
medium sized domestic corporations and, to a limited extent, foreign
corporations. Such companies generally have market capitalizations ranging from
$200 million to $3 billion.

For the three months ended March 31, 1999, the Portfolio had a total return of
9.54% for the Class A shares and 9.58% for the Class B shares compared to a
total return of -5.42% for the Russell 2000 Index (the "Index"). For the
one-year period ended March 31, 1999, the Portfolio had a total return of 20.11%
for the Class A shares and 19.72% for the Class B shares compared to -16.26% for
the Index. For the five-year period ended March 31, 1999, the average annual
total return of Class A shares was 17.43% compared to 11.22% for the Index. From
inception on November 1, 1989 through March 31, 1999, the average annual total
return of Class A shares was 14.22% compared to 11.42% for the Index. From
inception on January 2, 1996 through March 31, 1999, the average annual total
return of Class B shares was 15.59% compared to 8.69% for the Index.

PERFORMANCE COMPARED TO THE RUSSELL 2000 INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                                         TOTAL RETURNS(2)
                                             -----------------------------------------
                                                                              AVERAGE
                                                                 AVERAGE      ANNUAL
                                                        ONE       ANNUAL       SINCE
                                              YTD      YEAR     FIVE YEARS   INCEPTION
                                             ------   -------   ----------   ---------
<S>                                          <C>      <C>       <C>          <C>
PORTFOLIO -- CLASS A.......................   9.54%    20.11%     17.43%      14.22%
PORTFOLIO -- CLASS B.......................   9.58     19.72       N/A        15.59
INDEX -- CLASS A...........................  -5.42    -16.26      11.22       11.42
INDEX--CLASS B.............................  -5.42    -16.26       N/A         8.69
</TABLE>

1. The Russell 2000 Index is comprised of the 2,000 smallest companies in the
   Russell 3000 Index. The companies have an average market capitalization of
   approximately $600 million.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST.

The first quarter return was very strong. These returns compare favorably to the
performance of the Index over the same period. Importantly we were able to
achieve significant outperformance despite having minimal exposure to internet
stocks, which added substantially to the results of the Index. Our best
performers for the period included several positions in our top 10 -- Nielsen
Media, Montana Power, and Abercrombie & Fitch, as well as several small cap
technology issues.

Our investment process continues to be driven by bottom up, fundamental
research. We tend to favor companies with exceptional earnings and cash flow
growth potential, strong leadership positions within their industries, high
levels of profitability and top notch management teams. In addition, we focus
more on individual companies than sector allocation. Although we were overweight
consumer discretionary and underweight healthcare, and materials and processing
for the quarter, this was a function of our specific stock selection rather than
a top down decision.

While we had minimal exposure to the "pure play" internet stocks the Portfolio
is positioned to benefit from continuing growth of the internet. Our largest
position at quarter end, Nielsen Media Research, is the dominant provider of
television ratings in the U.S. and Canada, serving national and local customers
including television networks and affiliates, independent stations, syndicates,
cable networks, advertisers and their agencies. The company's stock appreciated
over 30% in the first quarter as investors became more aware of Nielsen's
internet ratings opportunity. We continue to view the shares as attractive given
the company's monopoly position in its core business, high visibility of
earnings and strong cash flow.

Another large holding in the Portfolio is Associated Group. The company owns an
exciting group of telecommunications interests including a controlling interest
in Teligent, a wireless communications company with a small to medium-sized
business focus. In addition, the company's management team has an exceptional
history of creating significant shareholder value in the radio, cable and
telecom industries. We expect progress in Associated's True Position solution,
which enables local authorities to locate wireless emergency 911 callers, to be
a catalyst for the stock over the next year.

- --------------------------------------------------------------------------------
                                                       Emerging Growth Portfolio

                                       69
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EMERGING GROWTH PORTFOLIO (CONT.)

Sonic remains a top 10 position in the Portfolio. The largest operator and
franchisor of drive-in restaurants in the U.S., Sonic's core business is
accelerating due to the company's increased efforts to update the look of its
older restaurants, as well as its expanded advertising program. The incremental
returns on the company's investment in store remodels is well over 40% and
should help drive earnings per share growth over the next 18 months. In
addition, Sonic is in the process of raising its royalty fees from franchisees,
which will benefit companywide profitability significantly through the remainder
of the year.

Looking forward, we continue to see many opportunities for capital appreciation
in small to mid-sized companies. At quarter end there were 86 names in the
Portfolio, with the top 10 representing roughly 43% of the Portfolio's net
assets.

Alexander L. Umansky
PORTFOLIO MANAGER

Dennis P. Lynch
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Emerging Growth Portfolio

                                       70
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING GROWTH PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                VALUE
 SHARES                                                         (000)
<C>         <S>                                                <C>
- -----------------------------------------------------------------------

COMMON STOCKS (97.4%)
  AUTO & TRANSPORTATION (0.9%)
     TRANSPORTATION MISCELLANEOUS (0.9%)
  12,500    C.H. Robinson Worldwide, Inc.....................  $    318
                                                               --------
  CONSUMER DISCRETIONARY (38.3%)
     ADVERTISING AGENCIES (4.8%)
   6,500    ADVO, Inc........................................       126
 105,462    R.H. Donnelley Corp..............................     1,628
                                                               --------
                                                                  1,754
                                                               --------
     COMMUNICATIONS & MEDIA (0.4%)
   5,300    Pegasus Communications Corp......................       148
                                                               --------
     EDUCATION SERVICES (1.0%)
   6,200    DeVry, Inc.......................................       180
   5,100    ITT Educational Services, Inc....................       191
                                                               --------
                                                                    371
                                                               --------
     ENTERTAINMENT (4.4%)
  31,864    Cedar Fair L.P...................................       801
  12,472    SFX Entertainment, Inc...........................       805
                                                               --------
                                                                  1,606
                                                               --------
     HOTEL/MOTEL (0.6%)
   4,900    Four Seasons Hotels, Inc.........................       205
                                                               --------
     LEISURE TIME (0.3%)
   3,700    Ducati Motor Holdings, Inc.......................       106
                                                               --------
     PUBLISHING (0.0%)
     400    Ziff-Davis Inc...................................        14
                                                               --------
     RADIO & TV BROADCASTERS (4.2%)
   5,500    Heftel Broadcasting Corp., Class A...............       239
  15,192    Metro Networks, Inc..............................       835
  12,500    TV Guide, Inc....................................       461
                                                               --------
                                                                  1,535
                                                               --------
     RESTAURANTS (5.5%)
  12,900    Papa John's International, Inc...................       569
  54,446    Sonic Corp.......................................     1,467
                                                               --------
                                                                  2,036
                                                               --------
     RETAIL (7.4%)
  17,300    Abercrombie & Fitch Co., Class A.................     1,591
   3,900    dELiA*s Inc......................................       123
   4,700    Linens' n Things, Inc............................       213
  13,400    P.F. Chang's China Bistro, Inc...................       409
  12,400    Tweeter Home Entertainment Group, Inc............       400
                                                               --------
                                                                  2,736
                                                               --------
     SERVICES: COMMERCIAL (9.7%)
   7,000    Argosy Education Group, Inc......................        60
  73,611    Nielsen Media Research, Inc......................     1,817
  25,900    The Corporate Executive Board Company............       683

<CAPTION>

                                                                VALUE
 SHARES                                                         (000)
<C>         <S>                                                <C>
- -----------------------------------------------------------------------

   8,400    USWeb Corp.......................................  $    347
  23,408    Viad Corp........................................       651
                                                               --------
                                                                  3,558
                                                               --------
  TOTAL CONSUMER DISCRETIONARY...............................    14,069
                                                               --------
  CONSUMER STAPLES (2.9%)
     FOODS (2.9%)
  23,168    Tootsie Roll Industries, Inc.....................     1,067
                                                               --------
  FINANCIAL SERVICES (14.5%)
     DIVERSIFIED FINANCIAL SERVICES (3.0%)
   3,600    BISYS Group, Inc.................................       202
  23,321    Mutual Risk Management Ltd.......................       892
                                                               --------
                                                                  1,094
                                                               --------
     FINANCIAL MISCELLANEOUS (0.8%)
  41,068    Indigo Aviation AB ADR...........................       298
                                                               --------
     INSURANCE: MULTI-LINE (7.6%)
  30,796    American Bankers Insurance Group, Inc............     1,602
  34,784    Reinsurance Group of America, Inc. (Non-
              Voting)........................................     1,178
                                                               --------
                                                                  2,780
                                                               --------
     INVESTMENT MANAGEMENT COMPANIES (2.7%)
  31,792    PIMCO Advisors Holdings L.P......................       999
                                                               --------
     SAVINGS & LOAN (0.4%)
   1,900    TeleBanc Financial Corp..........................       152
                                                               --------
  TOTAL FINANCIAL SERVICES...................................     5,323
                                                               --------
  HEALTH CARE (1.1%)
     DRUGS & PHARMACEUTICALS (0.3%)
   4,082    Medicis Pharmaceutical, Class A..................       122
                                                               --------
     MEDICAL & DENTAL INSTRUMENTS & SUPPLIES (0.8%)
   4,400    Novoste Corp.....................................       106
   4,800    Xomed Surgical Products, Inc.....................       188
                                                               --------
                                                                    294
                                                               --------
  TOTAL HEALTH CARE..........................................       416
                                                               --------
  MATERIALS & PROCESSING (0.6%)
     ENGINEERING & CONTRACTING SERVICES (0.6%)
   4,400    Metromedia Fiber Network, Inc., Class A..........       228
                                                               --------
  PRODUCER DURABLES (4.5%)
     ELECTRONICS: INSTRUMENTS GAUGES & METERS (2.1%)
  20,768    Dionex Corp......................................       784
                                                               --------
     MACHINERY: INDUSTRIAL/SPECIALTY (0.8%)
   7,600    Veeco Instruments, Inc...........................       281
                                                               --------
     OFFICE FURNITURE & BUSINESS EQUIPMENT (0.3%)
   4,300    Knoll, Inc.......................................       106
                                                               --------
     PRODUCTION TECHNOLOGY EQUIPMENT (1.3%)
   4,300    Uniphase Corp....................................       495
                                                               --------
  TOTAL PRODUCER DURABLES....................................     1,666
                                                               --------
</TABLE>

- --------------------------------------------------------------------------------
                                                       Emerging Growth Portfolio

                                       71
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING GROWTH PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                VALUE
 SHARES                                                         (000)
- -----------------------------------------------------------------------
<C>         <S>                                                <C>
  TECHNOLOGY (24.2%)
     COMMUNICATIONS TECHNOLOGY (11.6%)
  19,000    Advanced Fibre Communications, Inc...............  $    182
  51,140    American Tower Corp., Class A....................     1,253
   9,700    Cellular Communications of Puerto Rico...........       262
  10,400    CIENA Corp.......................................       234
   5,700    CoreComm Ltd.....................................       209
  20,400    Crown Castle International Corp..................       367
   4,800    Harmonic Lightwaves Inc..........................       133
   2,700    International Network Services...................       189
   8,400    L-3 Communications Corp..........................       389
   3,400    Leap Wireless International, Inc.................        43
   7,800    Level One Communications, Inc....................       379
   4,500    Proxim, Inc......................................       129
   4,200    RF Micro Devices, Inc............................       402
  10,400    Tekelec, Inc.....................................        76
     600    Teligent, Inc. Class A...........................        25
                                                               --------
                                                                  4,272
                                                               --------
     COMPUTER SERVICES SOFTWARE & SYSTEMS (6.7%)
     200    Autobytel.com, Inc...............................         8
  11,600    Citrix Systems, Inc..............................       442
   2,400    Concentric Network Corp..........................       179
   1,400    Exodus Communications, Inc.......................       188
   8,200    J.D. Edwards & Co................................        98
   9,100    Micromuse, Inc...................................       419
  10,700    National Computer Systems, Inc...................       262
   3,000    New Era of Networks, Inc.........................       203
     300    OneMain.com, Inc.................................        11
   3,100    PSInet, Inc......................................       132
  27,700    Software AG Systems, Inc.........................       232
     100    Valley Media, Inc................................         2
  11,400    Vantive Corp.....................................       138
   3,500    Verio Inc........................................       162
                                                               --------
                                                                  2,476
                                                               --------
     COMPUTER TECHNOLOGY (3.3%)
     700    At Home Corp., Series A..........................       110
   8,200    FORE Systems, Inc................................       155
   1,900    Qlogic Corp......................................       128
  10,300    SanDisk Corp.....................................       273
   9,000    Transwitch Corp..................................       407
   7,200    Western Digital Corp.............................        57
   3,500    Xircom, Inc......................................        88
                                                               --------
                                                                  1,218
                                                               --------
     ELECTRONICS: SEMI-CONDUCTORS/COMPONENTS (2.6%)
  10,100    Conexant Systems Inc.............................       280
   4,500    Micrel, Inc......................................       225
   7,800    Powerwave Technologies, Inc......................       221
   2,300    SDL Inc..........................................       209
                                                               --------
                                                                    935
                                                               --------
  TOTAL TECHNOLOGY...........................................     8,901
                                                               --------

<CAPTION>

                                                                VALUE
 SHARES                                                         (000)
<C>         <S>                                                <C>
- -----------------------------------------------------------------------

  UTILITIES (10.4%)
     UTILITIES: ELECTRICAL (4.3%)
  21,668    Montana Power Co.................................  $  1,594
                                                               --------
     UTILITIES: TELECOMMUNICATIONS (6.1%)
  36,232    Associated Group, Inc., Class B..................     1,757
   3,400    NTL, Inc.........................................       277
  11,300    Rogers Cantel Mobile Communications Inc..........       204
                                                               --------
                                                                  2,238
                                                               --------
  TOTAL UTILITIES............................................     3,832
                                                               --------
TOTAL COMMON STOCKS (Cost $29,413)...........................    35,820
                                                               --------
</TABLE>

<TABLE>
<CAPTION>
  FACE
 AMOUNT
 (000)
<C>         <S>                                                <C>
- --------

SHORT-TERM INVESTMENT (4.2%)
  REPURCHASE AGREEMENT (4.2%)
$  1,528    Chase Securities, Inc. 4.65%, dated 3/31/99, due
              4/01/99, to be repurchased at $1,528,
              collateralized by U.S. Treasury Bonds, 8.00%,
              due 11/15/21, valued at $1,565 (Cost $1,528)...     1,528
                                                               --------
TOTAL INVESTMENTS (101.6%) (Cost $30,941)....................    37,348
                                                               --------
</TABLE>

<TABLE>
<S>                                                            <C>
OTHER ASSETS AND LIABILITIES (-1.6%)
  Other Assets...............................................       410
  Liabilities................................................      (994)
                                                               --------
                                                                   (584)
                                                               --------
NET ASSETS (100%)............................................  $ 36,764
                                                               --------
                                                               --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................    $35,495
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 4,013,402 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $8.84
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $1,269
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 146,073 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $8.69
                                                                ---------
                                                                ---------
</TABLE>

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

ADR   --  American Depositary Receipt

- --------------------------------------------------------------------------------
Emerging Growth Portfolio

                                       72
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EQUITY GROWTH PORTFOLIO

The Equity Growth Portfolio employs a growth-oriented investment strategy
seeking long-term capital appreciation. The Portfolio seeks to accomplish its
objective by investing primarily in equities of medium and large capitalization
companies exhibiting strong earnings growth.

For the three months ended March 31, 1999, the Portfolio had a total return of
7.35% for the Class A shares and 7.22% for the Class B shares compared to a
total return of 4.98% for the S&P 500 Index (the "Index"). For the one-year
period ended March 31, 1999, the Portfolio had a total return of 9.44% for the
Class A shares and 9.20% for the Class B shares compared to 18.45% for the
Index. For the five-year period ended March 31, 1999, the average annual total
return for Class A shares was 27.25% compared to 26.24% for the Index. From
inception on April 2, 1991 through March 31, 1999, the average annual total
return for Class A shares was 19.48% compared to 19.21% for the Index. From
inception on January 2, 1996 through March 31, 1999 the average annual total
return of Class B shares was 26.95% compared to 27.45% for the Index.

PERFORMANCE COMPARED TO THE S&P 500 INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                          TOTAL RETURNS(2)
                         ---------------------------------------------------
                                                    AVERAGE       AVERAGE
                                        ONE       ANNUAL FIVE   ANNUAL SINCE
                            YTD         YEAR         YEARS       INCEPTION
                         ----------  ----------  -------------  ------------
<S>                      <C>         <C>         <C>            <C>
PORTFOLIO -- CLASS A...       7.35%       9.44%       27.25%         19.48%
PORTFOLIO -- CLASS B...       7.22        9.20        N/A            26.95
INDEX -- CLASS A.......       4.98       18.45        26.24          19.21
INDEX -- CLASS B.......       4.98       18.45        N/A            27.45
</TABLE>

1. The S&P 500 Index is a stock index comprised of 500 large-cap U.S. companies
   with market capitalization of $1 billion or more. These 500 companies are a
   representative sample of some 100 industries chosen mainly for market size,
   liquidity and industry group representation.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST.

We are very encouraged by the strong first quarter return. Outperformance was
driven by United Technologies (our largest position at the beginning of the year
- -- and up 26.7% in the first quarter) as well as America Online, Microsoft and
Clear Channel Communications. The largest detractors to performance came from
our tobacco-related holdings -- Loews Corp and Philip Morris, which have both
been reduced in the Portfolio.

We continue to have confidence in the strength of large capitalization growth
stocks for the balance of 1999. Notwithstanding higher oil prices, inflation
remains in check. While gross domestic product growth has been somewhat stronger
than expected, concerns about emerging markets, parts of Europe and certain
cyclical components of the U.S. economy should keep interest rates reasonable.
The weighted average market capitalization of the Portfolio is now approximately
$100 billion, in line with the Index weighted average market capitalization of
approximately $102 billion. The Portfolio has an estimated five-year earnings
growth rate of 19%, above that of the Indexes 15.9% expected growth rate (per
Factset).

Although the focus of our work is company-oriented, fundamental research, our
convictions at the security level may result in sector over- or under-weights.
Consequently, in the first quarter, as a result of our holdings in Tyco
International, United Technologies and General Electric the Portfolio was
overweight in capital goods.

Tyco (our largest holding) closed on its AMP acquisition April 2. This should be
a materially additive acquisition and a platform from which the company can make
additional accretive acquisitions. The integration of U.S. Surgical is ahead of
plan. We expect a combination of organic growth and strategic actions (further
acquisitions as well as selective divestitures) to lead to significant earnings
growth.

United Technologies was one of the strongest contributors to outperformance in
the first quarter. Management has now demonstrated an ability to consistently
increase quarterly and annual earnings per share at 15% or more. Earnings
quality is high, cash flow is strong and acquisitions are now a focal point.
With its acquisition of Sundstrand, the company has demonstrated an ability to
make acquisitions that are both strategically appropriate and financially sound.
Even with the stock's strong performance in 1998 (up almost 50%) and so far in
1999, we continue to believe the stock remains attractive, selling at about 19
times year 2000 estimated earnings per share.

- --------------------------------------------------------------------------------
                                                         Equity Growth Portfolio

                                       73
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EQUITY GROWTH PORTFOLIO (CONT.)

Consistency reigns supreme at General Electric. Management focus on being number
one or two, Six Sigma impact on operating margin advances and a learning culture
combine to lead to strong top line and bottom line growth. In addition, the
company is selectively making acquisitions in Asia to take advantage of rock
bottom prices. We believe this will be one of the next areas of value creation
and will be as successful as the company's previous purchase of real estate
properties at depressed prices following the Savings and Loan debacle and the
opportunistic European acquisitions of the last several years.

Technology now represents over 20% of the Portfolio. Positions initiated in the
quarter include Applied Materials, Uniphase, American Tower, Texas Instruments,
At Home, Sun Microsystems and Quantum. We eliminated Compaq Computer and Dell as
concerns about personal computer spending caused us to move to the sidelines.
One of our largest technology holdings is Microsoft, the worldwide leader in
software for personal computers; Microsoft is a "classic" growth story,
leveraging its dominant market position to capitalize on the dynamic growth in
the technology sector. We added to the stock at a suppressed level earlier in
the year as it came under pressure due to fears of an antitrust settlement.

We continue to search for ways to participate in the Internet phenomena. While
we believe this revolution is very real (traffic on the Internet doubles every
100 days), we remain concerned about some of the valuations of "pure play"
Internet stocks and prefer to play this growth through more traditional
holdings. With the exception of a 1.8% position in America Online and a farm
team position in At Home (0.4%), we have no pure Internet plays. However, we
have significant holdings in companies that will provide the infrastructure
and/or content for the Internet. Our largest holdings in this space include
Cisco, MCI Worldcom, AT&T, Time Warner, Comcast Cable, Clear Channel
Communications and Liberty Media. We also have farm team holdings in Montana
Power (a utility with a telecommunications business providing a data backbone),
Nielsen Media (which just launched an Internet capability), Disney, Chancellor
Media and three satellite companies (Hughes Electronics, Loral and Echostar). In
total, we have about 20% invested in the above telecommunications, technology
and content stocks that are exposed to the Internet.

Merck and Pfizer remain our largest pharmaceutical holdings. We further
increased our health care exposure in the first quarter, initiating positions in
Warner Lambert, Schering-Plough, Bristol Myers, American Home Products, and
Pharmacia & Upjohn, and adding to positions in Amgen, Pfizer, and Bausch & Lomb.
We eliminated our position in Genzyme, and reduced our holding in Eli Lilly. The
drug stocks underperformed the market in the first quarter as investor attention
returned to more economically sensitive names. We believe the group's
fundamentals remain intact, and potential Medicare legislation now looks likely
to be delayed until 2001.

We have been disappointed in our Loews holding and have reduced it from about 5%
at the beginning of the quarter to about 1.5%. While the company is repurchasing
stock, its CNA Insurance and Diamond Offshore holdings have been experiencing
downward earnings revisions and negative news on the tobacco litigation front
has impaired the tobacco division unit.

Philip W. Friedman
PORTFOLIO MANAGER

Margaret K. Johnson
PORTFOLIO MANAGER

William S. Auslander
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Equity Growth Portfolio

                                       74
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EQUITY GROWTH PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                 VALUE
 SHARES                                                          (000)
<C>         <S>                                                <C>
- ------------------------------------------------------------------------

COMMON STOCKS (97.3%)
  CAPITAL GOODS (20.5%)
     AEROSPACE/DEFENSE (1.6%)
 345,700    Gulfstream Aerospace Corp........................  $  14,995
                                                               ---------
     ELECTRICAL EQUIPMENT (3.6%)
 299,000    General Electric Co..............................     33,077
                                                               ---------
     MANUFACTURING (DIVERSIFIED) (13.0%)
 220,500    Textron, Inc.....................................     17,061
 741,100    Tyco International Ltd...........................     53,174
 380,700    United Technologies Corp.........................     51,561
                                                               ---------
                                                                 121,796
                                                               ---------
     OFFICE EQUIPMENT & SUPPLIES (2.3%)
 336,700    Pitney Bowes, Inc................................     21,464
                                                               ---------
  TOTAL CAPITAL GOODS........................................    191,332
                                                               ---------
  COMMUNICATION SERVICES (6.5%)
     TELECOMMUNICATIONS (LONG DISTANCE) (2.5%)
 289,589    AT&T Corp........................................     23,113
                                                               ---------
     TELEPHONE (4.0%)
 162,200    Bell Atlantic Corp...............................      8,384
 328,100    MCI Worldcom, Inc................................     29,057
                                                               ---------
                                                                  37,441
                                                               ---------
  TOTAL COMMUNICATION SERVICES...............................     60,554
                                                               ---------
  CONSUMER CYCLICALS (12.3%)
     LEISURE TIME PRODUCTS (0.1%)
  12,700    Harley-Davidson, Inc.............................        730
                                                               ---------
     RETAIL (BUILDING SUPPLIES) (2.3%)
 318,000    Home Depot, Inc..................................     19,795
  31,200    Lowe's Cos., Inc.................................      1,888
                                                               ---------
                                                                  21,683
                                                               ---------
     RETAIL (GENERAL MERCHANDISE) (3.3%)
 160,300    Costco Cos., Inc.................................     14,677
 179,000    Wal-Mart Stores, Inc.............................     16,502
                                                               ---------
                                                                  31,179
                                                               ---------
     RETAIL (SPECIALTY) (2.5%)
  13,900    Abercrombie & Fitch Co., Class A.................      1,279
 272,100    Gap, Inc.........................................     18,316
  78,800    Intimate Brands, Inc.............................      3,792
                                                               ---------
                                                                  23,387
                                                               ---------
     RETAIL (SPECIALTY/APPAREL) (0.6%)
 141,500    Office Depot, Inc................................      5,209
                                                               ---------
     RETAILS (COMPUTERS & ELECTRONICS) (0.4%)
  82,000    Best Buy Co., Inc................................      4,264
                                                               ---------
     SERVICES (ADVERTISING/MARKETING) (0.8%)
  88,500    Omnicom Group, Inc...............................      7,074
                                                               ---------

<CAPTION>

                                                                 VALUE
 SHARES                                                          (000)
<C>         <S>                                                <C>
- ------------------------------------------------------------------------

     SERVICES (COMMERCIAL & CONSUMER) (2.3%)
      58    Berkshire Hathaway, Inc., Class A................  $   4,141
   4,469    Berkshire Hathaway, Inc., Class B................     10,507
 254,132    Nielsen Media Research, Inc......................      6,274
                                                               ---------
                                                                  20,922
                                                               ---------
  TOTAL CONSUMER CYCLICALS...................................    114,448
                                                               ---------
  CONSUMER STAPLES (14.5%)
     BEVERAGES (NON-ALCOHOLIC) (0.9%)
 266,500    Coca Cola Enterprises, Inc.......................      8,062
                                                               ---------
     BROADCASTING (TV, RADIO, CABLE) (6.7%)
 267,700    AT&T Corp., Liberty Media Group, Class A-
              Common.........................................     14,088
 125,700    Chancellor Media Corp............................      5,924
 453,100    Clear Channel Communications, Inc................     30,386
 128,100    Comcast Corp., Class A-Special...................      8,062
  74,300    Comcast Corp., Class A-Common....................      4,569
                                                               ---------
                                                                  63,029
                                                               ---------
     ENTERTAINMENT (2.2%)
 145,600    The Walt Disney Co...............................      4,532
 232,000    Time Warner, Inc.................................     16,486
                                                               ---------
                                                                  21,018
                                                               ---------
     FOODS (1.1%)
 103,300    Keebler Foods Co.................................      3,770
 100,600    Quaker Oats Co...................................      6,294
                                                               ---------
                                                                  10,064
                                                               ---------
     HOUSEHOLD PRODUCTS (NON-DURABLES) (1.1%)
   8,500    Clorox Co........................................        996
  90,700    Procter & Gamble Co..............................      8,883
                                                               ---------
                                                                   9,879
                                                               ---------
     RETAIL (DRUG STORES) (0.4%)
 125,700    Walgreen Company.................................      3,551
                                                               ---------
     RETAIL (FOOD CHAINS) (0.6%)
 115,100    Safeway Inc......................................      5,906
                                                               ---------
     TOBACCO (1.5%)
 398,200    Philip Morris Cos., Inc..........................     14,012
                                                               ---------
  TOTAL CONSUMER STAPLES.....................................    135,521
                                                               ---------
  ENERGY (0.5%)
     OIL (INTERNATIONAL INTEGRATED) (0.5%)
  62,000    Exxon Corp.......................................      4,375
                                                               ---------
  FINANCIAL (6.5%)
     BANKS (MAJOR REGIONAL) (0.9%)
 243,200    Bank of New York Co., Inc........................      8,740
                                                               ---------
     FINANCIAL (DIVERSIFIED) (2.3%)
  92,900    American Express Co..............................     10,916
 158,050    Citigroup, Inc...................................     10,095
                                                               ---------
                                                                  21,011
                                                               ---------
</TABLE>

- --------------------------------------------------------------------------------
                                                         Equity Growth Portfolio

                                       75
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EQUITY GROWTH PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                 VALUE
 SHARES                                                          (000)
- ------------------------------------------------------------------------
<C>         <S>                                                <C>
</TABLE>

  FINANCIAL (CONT.)
<TABLE>
<C>         <S>                                                <C>
     INSURANCE (LIFE & HEALTH) (0.5%)
 132,850    Reinsurance Group of America, Inc., cumulative
              non-voting.....................................  $   4,500
                                                               ---------
     INSURANCE (MULTI-LINE) (1.7%)
 213,500    Loews Corp.......................................     15,933
                                                               ---------
     INSURANCE (PROPERTY-CASUALTY) (0.2%)
  15,000    Progressive Corp.................................      2,153
                                                               ---------
     INVESTMENT BANKING & BROKERAGE (0.7%)
  78,100    Merrill Lynch & Co...............................      6,907
                                                               ---------
     INVESTMENT MANAGEMENT (0.2%)
  68,900    PIMCO Advisors Holdings L.P......................      2,166
                                                               ---------
  TOTAL FINANCIAL............................................     61,410
                                                               ---------
  HEALTH CARE (13.3%)
     HEALTH CARE (DIVERSIFIED) (3.2%)
  42,700    American Home Products Corp......................      2,786
  91,200    Bristol-Myers Squibb Co..........................      5,865
  81,800    Johnson & Johnson................................      7,664
 206,900    Warner Lambert Co................................     13,694
                                                               ---------
                                                                  30,009
                                                               ---------
     HEALTH CARE (DRUGS-GENERIC & OTHERS) (1.9%)
 238,000    Amgen, Inc.......................................     17,820
                                                               ---------
     HEALTH CARE (DRUGS-MAJOR PHARMS) (6.9%)
  64,000    Eli Lilly & Co...................................      5,432
 301,200    Merck & Co., Inc.................................     24,153
 171,700    Pfizer, Inc......................................     23,823
  40,200    Pharmacia & Upjohn, Inc..........................      2,508
 157,200    Schering-Plough Corp.............................      8,695
                                                               ---------
                                                                  64,611
                                                               ---------
     HEALTH CARE (MEDICAL PRODUCTS & SUPPLIES) (1.3%)
 175,800    Bausch & Lomb, Inc...............................     11,427
                                                               ---------
  TOTAL HEALTH CARE..........................................    123,867
                                                               ---------
  TECHNOLOGY (22.9%)
     COMMUNICATION EQUIPMENT (2.5%)
 176,600    American Tower Corp., Class A....................      4,327
  12,000    EchoStar Communications Corp.....................        980
  27,400    L-3 Communications Corp..........................      1,267
  50,900    Lucent Technologies, Inc.........................      5,484
 151,600    Motorola, Inc....................................     11,105
                                                               ---------
                                                                  23,163
                                                               ---------
     COMPUTERS (HARDWARE) (0.8%)
  30,500    International Business Machines Corp.............      5,406
  19,400    Sun Microsystems, Inc............................      2,424
                                                               ---------
                                                                   7,830
                                                               ---------
<CAPTION>

                                                                 VALUE
 SHARES                                                          (000)
<C>         <S>                                                <C>
- ------------------------------------------------------------------------

     COMPUTERS (NETWORKING) (3.6%)
  11,100    Ascend Communications, Inc.......................  $     929
  16,200    At Home Corp., Series A..........................      2,551
 273,675    Cisco Systems, Inc...............................     29,985
                                                               ---------
                                                                  33,465
                                                               ---------
     COMPUTERS (PERIPHERALS) (0.5%)
  16,800    EMC Corp.........................................      2,146
 175,100    Quantum Corp.....................................      3,152
                                                               ---------
                                                                   5,298
                                                               ---------
     COMPUTERS (SOFTWARE & SERVICES) (7.5%)
 126,900    America Online, Inc..............................     18,527
   6,400    Autobytel.com, Inc...............................        268
 467,700    Microsoft Corp...................................     41,918
 226,700    Novell, Inc......................................      5,710
   7,600    OneMain.com, Inc.................................        275
 122,350    Oracle Corp......................................      3,227
   2,000    Valley Media, Inc................................         46
  10,500    Ziff-Davis, Inc..................................        378
                                                               ---------
                                                                  70,349
                                                               ---------
     ELECTRONICS (DEFENSE) (3.1%)
 168,700    General Motors Corp., Class H....................      8,509
 256,900    Litton Industries, Inc...........................     14,772
 375,300    Loral Space & Communications.....................      5,418
                                                               ---------
                                                                  28,699
                                                               ---------
     ELECTRONICS (SEMICONDUCTORS) (3.4%)
 235,800    Intel Corp.......................................     28,089
  41,600    Texas Instruments, Inc...........................      4,129
                                                               ---------
                                                                  32,218
                                                               ---------
     EQUIPMENT (SEMICONDUCTORS) (1.5%)
 131,300    Applied Materials, Inc...........................      8,100
  46,300    Uniphase Corp....................................      5,330
   9,300    Veeco Instruments, Inc...........................        343
                                                               ---------
                                                                  13,773
                                                               ---------
  TOTAL TECHNOLOGY...........................................    214,795
                                                               ---------
  UTILITIES (0.3%)
     ELECTRIC COMPANIES (0.3%)
  43,000    Montana Power Co.................................      3,163
                                                               ---------
TOTAL COMMON STOCKS (Cost $695,486)..........................    909,465
                                                               ---------
</TABLE>

- --------------------------------------------------------------------------------
Equity Growth Portfolio

                                       76
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EQUITY GROWTH PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
 FACE
AMOUNT                                                         VALUE
 (000)                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

SHORT-TERM INVESTMENT (4.2%)
  REPURCHASE AGREEMENT (4.2%)
$38,970    Chase Securities, Inc. 4.65%, dated 3/31/99, due
             4/01/99, to be repurchased at $38,975,
             collateralized by U.S. Treasury Notes, 4.50%,
             due 1/31/01, valued at $39,267 (Cost
             $38,970).......................................  $ 38,970
                                                              --------
TOTAL INVESTMENTS (101.5%) (Cost $734,456)..................   948,435
                                                              --------
</TABLE>

<TABLE>
<S>                                                           <C>
OTHER ASSETS AND LIABILITIES (-1.5%)
  Other Assets..............................................    30,635
  Liabilities...............................................   (44,402)
                                                              --------
                                                               (13,767)
                                                              --------
NET ASSETS (100%)...........................................  $934,668
                                                              --------
                                                              --------
</TABLE>

<TABLE>
<CAPTION>
- ------------------------------------------------------------------------
CLASS A:
- --------------------------------------------------------------
<S>                                                             <C>
NET ASSETS....................................................  $801,163
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 39,200,133 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................    $20.44
                                                                --------
                                                                --------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................  $133,505
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 6,561,031 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................    $20.35
                                                                --------
                                                                --------
</TABLE>

- --------------------------------------------------------------------------------
                                                         Equity Growth Portfolio

                                       77
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
TECHNOLOGY PORTFOLIO

The investment objective of the Technology Portfolio is to achieve long-term
capital appreciation by investing primarily in equity securities of companies
that the investment adviser expects to benefit from their involvement in
technology and technology-related industries. The focus of the Portfolio is to
identify significant long-term technology trends and to invest in those premier
companies we believe are positioned to materially gain from these trends. Stocks
selected for the Portfolio are also expected to meet comprehensive selection
criteria. The Portfolio may invest up to 35% of its total investments in
securities of foreign companies to participate sufficiently in the global
technology market.

PERFORMANCE COMPARED TO THE S&P 500 INDEX AND THE LIPPER SCIENCE AND TECHNOLOGY
FUNDS INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                        TOTAL RETURNS(2)
                          --------------------------------------------
                                                      AVERAGE ANNUAL
                             YTD        ONE YEAR     SINCE INCEPTION
                          ----------  ------------  ------------------
<S>                       <C>         <C>           <C>
PORTFOLIO -- CLASS A....      18.24%       57.07%           47.39%
PORTFOLIO -- CLASS B....      18.14        56.63            47.03
S&P 500 INDEX...........       4.98        18.45            30.42
LIPPER SCIENCE AND
 TECHNOLOGY FUNDS
 INDEX..................      11.61        42.67            29.88
</TABLE>

1. The S&P 500 Index is a stock index comprised of 500 large-cap U.S. companies
   with market capitalization of $1 billion or more. These 500 companies are a
   representative sample of some 100 industries chosen mainly for market size,
   liquidity and industry group representation. The Lipper Science and
   Technology Funds Index is a composite index of mutual funds that invest at
   least 65% of their assets in science and technology stocks.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK
CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING.

For the three months ended March 31, 1999, the Portfolio had a total return of
18.24% for the Class A shares and 18.14% for the Class B shares compared to
4.98% for the S&P 500 Index and 11.61% for the Lipper Science and Technology
Funds Index. For the one-year period ended March 31, 1999, the Portfolio had a
total return of 57.07% for the Class A shares and 56.63% for the Class B shares
compared to 18.45% for the S&P 500 Index and 42.67% for the Lipper Science and
Technology Funds Index. From inception on September 16, 1996 through March 31,
1999, the average annual total return of Class A shares was 47.39% and 47.03%
for Class B shares compared to 30.42% for the S&P 500 Index and 29.88% for the
Lipper Science and Technology Funds Index.

The first quarter return was very strong. We were pleased with the Portfolio's
outperformance of the S&P 500 Index and Lipper Science and Technology Index as
we managed to create substantial relative and absolute gains.

The outperformance for the quarter was due to the Portfolio being overweight the
telecom, semiconductor and semi-cap equipment sectors, and underweight the
software sector. Our Internet names such as America Online and At Home exhibited
very strong performance as well.

During the quarter we dramatically reduced our exposure to the PC sector by
eliminating names such as Compaq, Dell, and IBM. We further increased our
positions in the semiconductor and semi-cap equipment areas by adding to
positions in Linear Technology, Maxim, Xilinx, and Applied Materials.

We believe fundamentals for technology continue to be favorable, especially in
broadband technology and Internet Protocol communications. The
telecommunications industry continues to see 25%-to-35% growth in the demand for
data services; Internet access (business and consumer) is growing exponentially
and the cable and long distance companies are in the middle of a multi-billion
dollar, multi-year broadband build out.

Even though there are some valid concerns over a potential slowdown in IT
spending due to Y2K related problems, we believe that companies will continue to
spend on these technologies in order to stay competitive, in both product and
service features and to decrease costs.

There are over 2,000 public technology companies and we strive to invest in the
best 100. Our goal remains the same; identify the premier sectors and companies
that present compelling investment opportunities and avoid the sectors and
companies with deteriorating fundamentals.

Alexander Umansky
PORTFOLIO MANAGER

Stephen C. Sexauer
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Technology Portfolio

                                       78
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

TECHNOLOGY PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                               VALUE
SHARES                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

COMMON STOCK (96.8%)
  TECHNOLOGY (96.8%)
     DATA COMMUNICATIONS (22.9%)
  7,500    3Com Corp........................................  $    175
  6,800    Adaptec, Inc.....................................       156
 15,800    ADC Telecommunications, Inc......................       753
 38,500    Advanced Fibre Communications, Inc...............       369
  1,600    AirTouch Communications, Inc.....................       155
  8,600    Alcatel Alsthom ADR..............................       196
  6,000    American Tower Corp., Class A....................       147
  5,900    Ascend Communications, Inc.......................       494
  9,200    CIENA Corp.......................................       207
  9,350    Cisco Systems, Inc...............................     1,024
  7,600    Commscope, Inc...................................       159
  4,500    General Instrument Corp..........................       136
  3,600    Harmonic Lightwaves, Inc.........................        99
  3,200    JDS Fitel, Inc...................................       180
  6,600    Metromedia Fiber Network, Inc., Class A..........       342
 11,600    Newbridge Networks Corp..........................       360
  1,700    Northern Telecom Ltd.............................       106
  5,800    Powerwave Technologies, Inc......................       165
  3,800    Proxim, Inc......................................       109
  4,100    QUALCOMM, Inc....................................       510
  3,200    RF Micro Devices, Inc............................       306
  2,300    Scientific-Atlanta, Inc..........................        63
  1,650    Sprint PCS.......................................        73
  7,900    Tekelec, Inc.....................................        58
  6,800    TranSwitch Corp..................................       308
                                                              --------
                                                                 6,650
                                                              --------
     DATA STORAGE & PROCESSING (5.2%)
  4,200    EMC Corp.........................................       536
 16,500    Quantum Corp.....................................       297
  9,700    SanDisk Corp.....................................       257
 12,300    Seagate Technology, Inc..........................       364
  8,400    Western Digital Corp.............................        67
                                                              --------
                                                                 1,521
                                                              --------
     ELECTRONIC EQUIPMENT (11.3%)
  7,300    Best Buy Co., Inc................................       380
  1,200    Exodus Communications, Inc.......................       161
 20,000    FORE Systems, Inc................................       378
  1,300    International Network Services...................        91
  5,150    Level One Communications, Inc....................       250
  4,600    Micrel, Inc......................................       230
  2,800    Networks Associates, Inc.........................        86
    400    Sanmina Corp.....................................        25
  4,500    Tandy Corp.......................................       287
  4,100    Tweeter Home Entertainment Group, Inc............       132
  8,500    Uniphase Corp....................................       979
 12,000    Universal Electronics, Inc.......................       150
    400    Visual Networks, Inc.............................        15
  3,600    Xylan Corp.......................................       133
                                                              --------
                                                                 3,297
                                                              --------

<CAPTION>

                                                               VALUE
SHARES                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

     INFORMATION PROCESSING (8.3%)
 13,720    America Online, Inc..............................  $  2,003
 14,094    Cendant Corp.....................................       222
  4,700    Electronics For Imaging, Inc.....................       183
                                                              --------
                                                                 2,408
                                                              --------
     MEDICAL TECHNOLOGY (0.6%)
  6,900    Novoste Corp.....................................       166
                                                              --------
     MICRO COMPUTER MFG (1.5%)
  3,600    Sun Microsystems, Inc............................       450
                                                              --------
     MINI & MAINFRAME COMPUTER MFG (0.7%)
  2,900    Hewlett Packard Co...............................       197
                                                              --------
     SEMICONDUCTOR CAPITAL EQUIPMENT MFG (3.4%)
 13,500    Applied Materials, Inc...........................       833
  3,000    KLA Tencor Corp..................................       145
                                                              --------
                                                                   978
                                                              --------
     SEMICONDUCTOR MFG (11.4%)
  3,300    Altera Corp......................................       196
  4,800    Analog Devices, Inc..............................       143
  5,000    ASM Lithography Holding N.V......................       225
    400    Broadcom Corp., Class A..........................        25
  7,700    Conexant Systems Inc.............................       213
  1,000    Dupont Photomasks, Inc...........................        40
  4,800    Intel Corp.......................................       572
  4,300    Linear Technology Corp...........................       220
  5,700    Maxim Integrated Products, Inc...................       308
 13,900    Micron Electronics, Inc..........................       163
  2,400    Micron Technology, Inc...........................       116
  5,700    Motorola, Inc....................................       418
  2,700    Texas Instruments, Inc...........................       268
 10,100    Xilinx, Inc......................................       410
                                                              --------
                                                                 3,317
                                                              --------
     SOFTWARE PRODUCTS (17.7%)
  2,600    At Home Corp., Series A..........................       409
    200    Autobytel.com, Inc...............................         8
  1,000    BEA Systems, Inc.................................        16
  6,800    BMC Software, Inc................................       252
 18,400    Citrix Systems, Inc..............................       701
 14,100    Compuware Corp...................................       337
  3,700    Concentric Network Corp..........................       277
  7,500    Hyperion Solutions Corp..........................       109
  3,100    Intuit, Inc......................................       315
 12,500    J.D. Edwards & Co................................       149
  1,800    Lycos, Inc.......................................       155
    100    MarketWatch.com, Inc.............................         7
  6,100    Micromuse, Inc...................................       281
  4,000    Microsoft Corp...................................       358
 27,400    Novell, Inc......................................       690
    200    OneMain.com, Inc.................................         7
 10,000    Parametric Technology Corp.......................       198
  3,700    Progress Software Corp...........................       126
</TABLE>

- --------------------------------------------------------------------------------
                                                            Technology Portfolio

                                       79
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

TECHNOLOGY PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                               VALUE
SHARES                                                         (000)
- ----------------------------------------------------------------------
<C>        <S>                                                <C>
</TABLE>

  TECHNOLOGY (CONT.)
     SOFTWARE PRODUCTS (CONT.)
<TABLE>
<C>        <S>                                                <C>
  2,200    PSInet, Inc......................................  $     94
 43,900    Software AG Systems, Inc.........................       368
 11,000    Vantive Corp.....................................       133
  2,900    Verio Inc........................................       134
    300    Ziff Davis, Inc..................................        11
                                                              --------
                                                                 5,135
                                                              --------
     TEST, ANALYSIS & INSTRUMENTATION EQUIPMENT (1.7%)
  2,000    Teradyne, Inc....................................       109
 10,500    Veeco Instruments, Inc...........................       388
                                                              --------
                                                                   497
                                                              --------
     OTHER (12.1%)
  3,000    Genesystems Telecommunications Labs, Inc.........        45
  3,900    Jones Pharma, Inc................................       136
  6,400    MCI Worldcom, Inc................................       567
  5,700    Medicis Pharmaceutical, Class A..................       171
  2,100    Montana Power Co.................................       154
 18,900    Nielsen Media Research, Inc......................       467
  6,600    SABRE Group Holdings, Inc........................       299
  3,200    Sprint Corp. (Fon Group).........................       314
  5,500    SunGard Data Systems, Inc........................       220
  3,300    TeleBanc Financial Corp..........................       263
  8,200    TV Guide, Inc....................................       302
  7,900    USWeb Corp.......................................       326
    100    Valley Media, Inc................................         2
 11,000    Whittman-Hart, Inc...............................       237
                                                              --------
                                                                 3,503
                                                              --------
  TOTAL TECHNOLOGY..........................................    28,119
                                                              --------
TOTAL COMMON STOCKS (Cost $22,421)..........................    28,119
                                                              --------
</TABLE>

<TABLE>
<CAPTION>
                                          VALUE
                                          (000)
<S>                                      <C>
- -------------------------------------------------
OTHER ASSETS AND LIABILITIES (3.2%)
  Other Assets.........................  $  1,557
  Liabilities..........................      (629)
                                         --------
                                              928
                                         --------
NET ASSETS (100%)......................  $ 29,047
                                         --------
                                         --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................    $27,886
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 1,311,679 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $21.26
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $1,161
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 54,806 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $21.17
                                                                ---------
                                                                ---------
</TABLE>

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

ADR   --  American Depositary Receipt

- --------------------------------------------------------------------------------
Technology Portfolio

                                       80
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        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
U.S. EQUITY PLUS PORTFOLIO

The U.S. Equity Plus Portfolio seeks long-term capital appreciation by investing
primarily in equity securities of issuers in the S&P 500 Index. Equity
securities include common and preferred stocks, convertible securities, and
rights and warrants to purchase common stocks.

The Portfolio investment process utilizes systematic quantitative and
qualitative inputs. The quantitative inputs include several proprietary
valuation and momentum models, as well as a market conditions model. The
qualitative inputs include stock ratings from Morgan Stanley Dean Witter's
Equity Research analysts. These inputs are combined in a systematic way to
produce an attractiveness measure for every stock in the Portfolio investment
universe. The Portfolio is designed to have consistently higher returns than the
S&P 500 with a volatility of portfolio return that is approximately equal to
that of the S&P 500. This is sought by using a multi-factor risk model for
building the Portfolio and by maintaining sector neutrality with respect to the
S&P 500 Index. The active exposure to any single company is also kept to a
modest level.

For the three months ended March 31, 1999, the Portfolio had a total return of
4.10% for the Class A shares and 4.11% for the Class B shares compared to 4.98%
for the S&P 500 Index (the "Index"). For the one-year period ended March 31,
1999, the Portfolio

PERFORMANCE COMPARED TO THE S&P 500 INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                             TOTAL RETURNS(2)
                                ------------------------------------------
                                               ONE        AVERAGE ANNUAL
                                   YTD         YEAR      SINCE INCEPTION
                                ----------  ----------  ------------------
<S>                             <C>         <C>         <C>
PORTFOLIO -- CLASS A(3).......       4.10%      12.58%          17.71%
PORTFOLIO -- CLASS B(3).......       4.11       12.30           17.53
INDEX.........................       4.98       18.45           21.47
</TABLE>

1. The S&P 500 Index is a stock index comprised of 500 large-cap U.S. companies
   with market capitalization of $1 billion or more. These 500 companies are a
   representative sample of some 100 industries chosen mainly for market size,
   liquidity and industry group representation.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

3. The Portfolio commenced operations on July 31, 1997.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST.

had a total return of 12.58% for the Class A shares and 12.30% for the Class B
shares compared to 18.45% for the Index. For the period from inception on July
31, 1997 through March 31, 1999, the Portfolio had an average annual total
return of 17.71% for Class A shares and 17.53% for the Class B shares compared
to 21.47% for the Index.

The Portfolio is sector neutral to the S&P 500, so sector weights had no impact
on incremental performance. The performance of a sector in the Portfolio is
completely driven by stock selection (and relative weights) within the sector.
Based on stock selection, our best performing sectors were technology,
telephone, capital goods, consumer services, and basic industries. Our worst
performing sectors were insurance, financial services, energy, health, and
banking.

Virtually all of the differential performance between Portfolio and the Index
came from active stock selection. The five largest contributions to our
performance relative to the Index came from the following stocks: 1) Amgen, a
large biomedical company, climbed 43% during the quarter. The company is close
to winning approval for promising new products for cancer and anemia. 2)
Anheuser Busch, a brewery company, returned 16%, as its dominant market share
and premium pricing helped it to maintain a strong momentum. 3) Bellsouth, a
local telephone company, fell 19%, as expectations that accelerated investments
on Internet and other new services would depress profits for the quarter. 4) SBC
Communications, an integrated telephone company, fell 11%, as the Supreme Court
upheld rules designed to make it easier for competitors to enter the local phone
market. 5) United Technologies, an aerospace and defense equipment company,
advanced 25% on good news of increasing margins in North America and Europe and
optimism about the sale of its auto parts business.

On the other side, the five most negative contributions to our performance
relative to the Index came from the following stocks: 1) Philip Morris, which
produces tobacco products, plunged 34%, amid a series of legislative losses and
increasing legal challenges. 2) Countrywide, which provides mortgage loans and
other banking services, dropped 25%, over concern that a recent rise in interest
rates would choke off their mortgage loan business as consumers shy away from
refinancing their loans. 3) Bank of New York, a money center bank, fell

- --------------------------------------------------------------------------------
                                                      U.S. Equity Plus Portfolio

                                       81
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        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
U.S. EQUITY PLUS PORTFOLIO (CONT.)

10%, as analysts voiced doubts about future revenues and earnings growth. 4)
Morgan Stanley Dean Witter, a diversified financial services firm, surged 41%,
as the firm reported record earnings, mostly from trading revenues (we are not
allowed to own MSDW shares). 5) Bankamerica, a money center bank, rose 18%, on
optimism that the company would boost future earnings by concentrating on core
products and reducing its international exposure.

After a choppy start in January and February, U.S. equities continued their
climb in March of 1999 and the Index advanced 4.98% during the quarter. Many of
the themes that began in 1998 continued. Large cap growth stocks outperformed
their value counterparts by 4%, as measured by S&P 500/Barra indices and small
stocks, as measured by the Russell 2000, underperformed large cap stocks by more
than 10%. For the most part, the marcoeconomic landscape for equities held
stable. Consumer confidence climbed back to the high levels seen in the second
quarter of 1998 and the economy continued on a path of non-inflationary growth.
The good news was tempered, however, with a small increase in interest rates and
weakening job creation in March. Looking forward, we maintain a cautious stance
about U.S. equity markets. Market breadth continued to deteriorate and the Fed
is probably no longer in an easing mode. The best hope for equities is corporate
earnings. Earnings have shown some signs of life after a fall in the second part
of 1998. Moreover, the global economic atmosphere may be warming. This can only
be supportive for U.S. equities.

Eugene Flood, Jr.
PORTFOLIO MANAGER

Narayan Ramachandran
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
U.S. Equity Plus Portfolio

                                       82
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        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

U.S. EQUITY PLUS PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                               VALUE
SHARES                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

COMMON STOCK (100.1%)
  BASIC MATERIALS (3.0%)
     CHEMICALS (1.4%)
  2,100    Dow Chemical Co..................................  $    196
  1,800    E.I. du Pont de Nemours & Co.....................       104
  1,200    Rohm & Haas Co...................................        40
                                                              --------
                                                                   340
                                                              --------
     CHEMICALS (DIVERSIFIED) (0.4%)
  2,400    Goodrich (BF) Co.................................        82
    500    Monsanto Co......................................        23
                                                              --------
                                                                   105
                                                              --------
     GOLD & PRECIOUS METALS MINING (0.4%)
  2,100    Barrick Gold Corp................................        36
  3,700    Newmont Mining Corp..............................        65
                                                              --------
                                                                   101
                                                              --------
     IRON & STEEL (0.1%)
  3,000    Bethlehem Steel Corp.............................        25
                                                              --------
     PAPER & FOREST (0.7%)
  1,700    Georgia Pacific Group............................       126
  1,000    Louisiana-Pacific Corp...........................        19
    600    Mead Corp........................................        19
    400    Weyerhauser Co...................................        22
                                                              --------
                                                                   186
                                                              --------
  TOTAL BASIC MATERIALS.....................................       757
                                                              --------
  CAPITAL GOODS (10.4%)
     AEROSPACE & DEFENSE (0.1%)
    600    Boeing Co........................................        20
                                                              --------
     ELECTRICAL EQUIPMENT (4.8%)
  4,400    Bank One Corp....................................       242
  1,600    Emerson Electric Co..............................        85
  7,200    General Electric Co..............................       797
    800    Raychem Corp.....................................        18
    300    Solectron Corp...................................        15
    300    Thomas & Betts Corp..............................        11
  1,800    Wells Fargo & Co.................................        63
                                                              --------
                                                                 1,231
                                                              --------
     ENGINEERING & CONSTRUCTION (0.7%)
  6,600    McDermot International, Inc......................       167
                                                              --------
     MACHINERY (DIVERSIFIED) (0.3%)
  2,600    Case Corp........................................        66
                                                              --------
     MANUFACTURING (DIVERSIFIED) (3.5%)
  4,600    Allied Signal, Inc...............................       226
  1,500    Corning, Inc.....................................        90
  1,900    Illinois Tool Works Inc..........................       118
  1,300    Johnson Controls, Inc............................        81

<CAPTION>

                                                               VALUE
SHARES                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

  2,100    Tyco International Ltd...........................  $    151
  1,700    United Technologies Corp.........................       230
                                                              --------
                                                                   896
                                                              --------
     MANUFACTURING (SPECIALIZED) (0.7%)
    900    Avery Dennison Corp..............................        52
 10,200    Fruit of the Loom, Inc...........................       106
    500    Millipore, Corp..................................        12
                                                              --------
                                                                   170
                                                              --------
     OFFICE EQUIPMENT & SUPPLIES (0.2%)
  1,100    Xerox Corp.......................................        59
                                                              --------
     TRUCKS & PARTS (0.1%)
    200    Cummins Engine Co., Inc..........................         7
    200    Navistar International Corp......................         8
                                                              --------
                                                                    15
                                                              --------
     WASTE MANAGEMENT (0.0%)
    300    Waste Management, Inc............................        13
                                                              --------
  TOTAL CAPITAL GOODS.......................................     2,637
                                                              --------
  COMMUNICATION SERVICES (8.9%)
     TELECOMMUNICATIONS (CELLULAR/WIRELESS) (0.5%)
  1,200    AirTouch Communications, Inc.....................       116
                                                              --------
     TELECOMMUNICATIONS (LONG DISTANCE) (2.8%)
  4,730    AT&T Corp........................................       377
  3,300    Sprint Corp......................................       324
                                                              --------
                                                                   701
                                                              --------
     TELEPHONE (5.6%)
  4,600    Alltel Corp......................................       287
  7,500    Bell Atlantic Corp...............................       388
  1,400    Bellsouth Corp...................................        56
  1,200    Frontier Corp....................................        62
  3,600    GTE Corp.........................................       218
  4,800    MCI Worldcom, Inc................................       425
                                                              --------
                                                                 1,436
                                                              --------
  TOTAL COMMUNICATION SERVICES..............................     2,253
                                                              --------
  CONSUMER CYCLICALS (10.1%)
     AUTOMOBILES (0.9%)
  2,300    Ford Motor Co....................................       130
    700    General Motors Corp..............................        61
                                                              --------
                                                                   191
                                                              --------
     BUILDING MATERIALS (0.5%)
    600    Armstrong World Industries, Inc..................        27
  3,100    Owens Corning....................................        99
                                                              --------
                                                                   126
                                                              --------
     CONSUMER (JEWELRY, NOVELTIES & GIFTS) (0.3%)
  1,700    American Greetings Corp., Class A................        43
  1,300    Jostens, Inc.....................................        28
                                                              --------
                                                                    71
                                                              --------
</TABLE>

- --------------------------------------------------------------------------------
                                                      U.S. Equity Plus Portfolio

                                       83
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

U.S. EQUITY PLUS PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                               VALUE
SHARES                                                         (000)
- ----------------------------------------------------------------------
<C>        <S>                                                <C>
</TABLE>

  CONSUMER CYCLICALS (CONT.)
<TABLE>
<C>        <S>                                                <C>
     HARDWARE & TOOLS (0.3%)
  1,000    Black & Decker Corp..............................  $     56
  1,800    Milacron, Inc....................................        28
                                                              --------
                                                                    84
                                                              --------
     HOMEBUILDING (0.2%)
  1,800    Kaufman & Broad Home Corp........................        40
  1,000    Pulte Corp.......................................        21
                                                              --------
                                                                    61
                                                              --------
     HOUSEHOLD FURNISHINGS & APPLIANCES (0.1%)
    300    Maytag Corp......................................        18
                                                              --------
     LEISURE TIME PRODUCTS (1.0%)
  3,300    Brunswick Corp...................................        63
  2,400    Hasbro, Inc......................................        69
  5,300    Mattel, Inc......................................       132
                                                              --------
                                                                   264
                                                              --------
     LODGING -- HOTELS (0.1%)
    300    Carnival Corp., Class A..........................        15
                                                              --------
     PUBLISHING (0.0%)
    200    McGraw-Hill Cos., Inc............................        11
                                                              --------
     PUBLISHING (NEWSPAPERS) (0.2%)
    600    Gannett Co., Inc.................................        38
                                                              --------
     RETAIL (BUILDING SUPPLIES) (1.2%)
  4,100    Home Depot, Inc..................................       255
  1,000    Lowe's Cos., Inc.................................        61
                                                              --------
                                                                   316
                                                              --------
     RETAIL (DEPARTMENT STORES) (0.3%)
    300    Kohl's Corp......................................        21
  1,650    May Department Stores, Co........................        65
                                                              --------
                                                                    86
                                                              --------
     RETAIL (GENERAL MERCHANDISE) (3.8%)
    300    Costco Companies Inc.............................        27
  3,400    Dayton Hudson Corp...............................       227
  1,000    Kmart Corp.......................................        17
  1,600    Sears Roebuck & Co...............................        72
  6,800    Wal-Mart Stores, Inc.............................       627
                                                              --------
                                                                   970
                                                              --------
     RETAIL (SPECIALTY) (0.2%)
    300    Gap, Inc.........................................        20
    600    Staples Inc......................................        20
    300    TJX Cos., Inc....................................        10
                                                              --------
                                                                    50
                                                              --------
     SERVICES (ADVERTISING/MARKETING) (0.6%)
  1,800    Omnicom Group, Inc...............................       144
                                                              --------
<CAPTION>

                                                               VALUE
SHARES                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

     SERVICES (COMMERCIAL & CONSUMER) (0.1%)
    800    Cendant Corp.....................................  $     12
    300    Dun & Brandstreet Corp...........................        11
    200    McKesson HBOC, Inc...............................        13
                                                              --------
                                                                    36
                                                              --------
     TEXTILES (APPAREL) (0.3%)
  2,400    Liz Claiborne, Inc...............................        78
                                                              --------
  TOTAL CONSUMER CYCLICALS..................................     2,559
                                                              --------
  CONSUMER STAPLES (12.5%)
     BEVERAGES (ALCOHOLIC) (2.1%)
  6,600    Anheuser Busch Cos., Inc.........................       503
    700    Coors (Adolph), Inc., Class B....................        38
                                                              --------
                                                                   541
                                                              --------
     BEVERAGES (NON-ALCOHOLIC) (0.6%)
    300    Coca Cola Enterprises, Inc.......................         9
  3,900    PepsiCo, Inc.....................................       153
                                                              --------
                                                                   162
                                                              --------
     BROADCASTING (TV, RADIO, CABLE) (0.7%)
  1,100    CBS Corp.........................................        45
    700    Comcast Corp., Class A...........................        44
    800    MediaOne Group, Inc..............................        51
                                                              --------
                                                                   140
                                                              --------
     DISTRIBUTORS (FOOD & HEALTH) (0.2%)
  2,600    SUPERVALU, Inc...................................        54
                                                              --------
     ENTERTAINMENT (1.3%)
  3,500    King World Productions, Inc......................       107
    100    The Walt Disney Co...............................         3
  2,900    Time Warner, Inc.................................       206
    300    Viacom, Inc., Class B............................        25
                                                              --------
                                                                   341
                                                              --------
     FOODS (0.8%)
    500    Quaker Oats Co...................................        31
    600    Ralston-Ralston Purina Group.....................        16
  6,500    Sara Lee Corp....................................       161
                                                              --------
                                                                   208
                                                              --------
     HOUSEHOLD PRODUCTS (NON-DURABLES) (2.3%)
    600    Clorox Co........................................        70
  2,200    Kimberly-Clark Corp..............................       106
  4,200    Procter & Gamble Co..............................       411
                                                              --------
                                                                   587
                                                              --------
     HOUSEWARES (0.1%)
    400    Fortune Brands, Inc..............................        15
                                                              --------
</TABLE>

- --------------------------------------------------------------------------------
U.S. Equity Plus Portfolio

                                       84
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

U.S. EQUITY PLUS PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                               VALUE
SHARES                                                         (000)
- ----------------------------------------------------------------------
<C>        <S>                                                <C>
</TABLE>

  CONSUMER STAPLES (CONT.)
<TABLE>
<C>        <S>                                                <C>
     PERSONAL CARE (0.5%)
  1,200    Alberto-Culver Co., Class B......................  $     28
    400    Avon Products, Inc...............................        19
  1,500    Gillette Co......................................        89
                                                              --------
                                                                   136
                                                              --------
     RESTAURANTS (1.2%)
  6,300    McDonald's Corp..................................       286
  1,000    Wendy's International, Inc.......................        28
                                                              --------
                                                                   314
                                                              --------
     RETAIL (DRUG STORES) (0.3%)
    500    Rite Aid Corp....................................        12
  1,800    Walgreen Co......................................        51
                                                              --------
                                                                    63
                                                              --------
     RETAIL (FOOD CHAINS) (1.2%)
    700    Albertson's, Inc.................................        38
  1,900    Kroger Co........................................       114
  3,000    Safeway Inc......................................       154
                                                              --------
                                                                   306
                                                              --------
     SPECIALTY PRINTING (0.2%)
  1,700    Deluxe Corp......................................        50
                                                              --------
     TOBACCO (1.0%)
  6,400    Philip Morris Cos., Inc..........................       225
  1,400    RJR Nabisco Holdings Corp........................        35
                                                              --------
                                                                   260
                                                              --------
  TOTAL CONSUMER STAPLES....................................     3,177
                                                              --------
  ENERGY (4.5%)
     OIL & GAS (DRILLING) (0.6%)
    500    Halliburton Co...................................        19
  2,400    Schlumberger Ltd.................................       145
                                                              --------
                                                                   164
                                                              --------
     OIL & GAS (EXPLORATION & DRILLING) (0.4%)
  1,000    Burlington Resources, Inc........................        40
  4,900    Union Pacific Resources Group Inc................        58
                                                              --------
                                                                    98
                                                              --------
     OIL (DOMESTIC INTEGRATED) (0.4%)
  3,200    USX-Marathon Group...............................        88
                                                              --------
     OIL (INTERNATIONAL INTEGRATED) (3.1%)
  5,800    Exxon Corp.......................................       409
  3,700    Mobil Corp.......................................       326
  1,000    Royal Dutch Petroleum Co.........................        52
                                                              --------
                                                                   787
                                                              --------
  TOTAL ENERGY..............................................     1,137
                                                              --------
<CAPTION>

                                                               VALUE
SHARES                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

  FINANCIAL (15.0%)
     BANKS (MAJOR REGIONAL) (2.6%)
  6,600    Bank of New York Co., Inc........................  $    237
  1,300    BankBoston Corp..................................        56
  2,300    Comerica, Inc....................................       144
  2,300    Fleet Financial Group, Inc.......................        87
  1,500    KeyCorp..........................................        46
    600    Mellon Bank Corp.................................        42
    600    SunTrust Banks, Inc..............................        37
    200    Wachovia Corp....................................        16
                                                              --------
                                                                   665
                                                              --------
     BANKS (MONEY CENTER) (1.7%)
  3,100    Chase Manhattan Corp.............................       252
  3,500    First Union Corp.................................       187
                                                              --------
                                                                   439
                                                              --------
     BANKS (REGIONAL) (0.2%)
    500    Firstar Corp.....................................        45
                                                              --------
     CONSUMER FINANCE (0.5%)
    400    Associates First Capital Corp., Class A..........        18
  1,800    Countrywide Credit Industries, Inc...............        67
  1,000    Household International, Inc.....................        46
                                                              --------
                                                                   131
                                                              --------
     FINANCIAL (DIVERSIFIED) (4.8%)
  1,700    American Express Co..............................       200
  8,800    Citigroup, Inc...................................       562
  3,100    Federal Home Loan Mortgage Corp..................       177
  3,900    Federal National Mortgage Assoc..................       270
                                                              --------
                                                                 1,209
                                                              --------
     INSURANCE (BROKERS) (0.5%)
  1,800    Marsh & McLennan Cos.............................       133
                                                              --------
     INSURANCE (LIFE & HEALTH) (0.8%)
  3,200    Conseco, Inc.....................................        99
  1,100    Provident Cos., Inc..............................        38
  1,900    Torchmark Corp...................................        60
                                                              --------
                                                                   197
                                                              --------
     INSURANCE (MULTI-LINE) (2.2%)
  3,500    American International Group, Inc................       422
  2,600    Hartford Financial Service Group, Inc............       148
                                                              --------
                                                                   570
                                                              --------
     INSURANCE (PROPERTY -- CASUALTY) (0.7%)
  2,600    Allstate Corp....................................        96
  1,400    Chubb Corp.......................................        82
                                                              --------
                                                                   178
                                                              --------
</TABLE>

- --------------------------------------------------------------------------------
                                                      U.S. Equity Plus Portfolio

                                       85
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

U.S. EQUITY PLUS PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                               VALUE
SHARES                                                         (000)
- ----------------------------------------------------------------------
<C>        <S>                                                <C>
</TABLE>

  FINANCIAL (CONT.)
<TABLE>
<C>        <S>                                                <C>
     INVESTMENT BANKING & BROKERAGE (0.8%)
  1,900    Bear Stearns Cos., Inc...........................  $     85
    500    Charles Schwab Corp..............................        48
  1,200    Lehman Brothers Holdings, Inc....................        72
                                                              --------
                                                                   205
                                                              --------
     SAVINGS & LOANS (0.2%)
  1,200    Washington Mutual, Inc...........................        49
                                                              --------
  TOTAL FINANCIAL...........................................     3,821
                                                              --------
  HEALTH CARE (11.9%)
     HEALTH CARE (DIVERSIFIED) (4.8%)
    800    Abbott Laboratories..............................        37
  1,700    American Home Products Corp......................       111
  9,100    Bristol-Myers Squibb Co..........................       585
  3,700    Johnson & Johnson................................       347
  2,200    Warner Lambert Co................................       146
                                                              --------
                                                                 1,226
                                                              --------
     HEALTH CARE (DRUGS -- GENERIC & OTHERS) (1.2%)
  4,100    Amgen, Inc.......................................       307
                                                              --------
     HEALTH CARE (DRUGS -- MAJOR PHARMS) (4.2%)
  4,100    Eli Lilly & Co...................................       348
  4,700    Merck & Co., Inc.................................       377
  2,200    Pfizer, Inc......................................       305
    500    Schering-Plough Corp.............................        28
                                                              --------
                                                                 1,058
                                                              --------
     HEALTH CARE (LONG-TERM CARE) (0.1%)
  2,700    HEALTHSOUTH Corp.................................        28
                                                              --------
     HEALTH CARE (MEDICAL PRODUCTS & SUPPLIES) (1.6%)
  3,800    Bausch & Lomb, Inc...............................       247
  1,100    Becton Dickinson & Co............................        42
  1,200    Guidant Corp.....................................        72
    500    Medtronic, Inc...................................        36
                                                              --------
                                                                   397
                                                              --------
     HEALTH CARE (SPECIALIZED SERVICES) (0.0%)
    200    Alza Corp., Class A..............................         8
                                                              --------
  TOTAL HEALTH CARE.........................................     3,024
                                                              --------
  TECHNOLOGY (20.0%)
     BIOTECHNOLOGY (0.1%)
    300    Baxter International, Inc........................        20
                                                              --------
     COMMUNICATION EQUIPMENT (2.8%)
  3,200    Lucent Technologies, Inc.........................       345
  1,700    Motorola, Inc....................................       124
  2,400    Northern Telecom Ltd.............................       149
    500    Scientific-Atlanta, Inc..........................        14
    900    Tellabs, Inc.....................................        88
                                                              --------
                                                                   720
                                                              --------
<CAPTION>

                                                               VALUE
SHARES                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

     COMPUTERS (HARDWARE) (4.5%)
  1,500    Compaq Computer Corp.............................  $     48
  5,500    Dell Computer Corp...............................       225
    600    Gateway 2000, Inc................................        41
  3,900    Hewlett Packard Co...............................       265
  2,400    International Business Machines Corp.............       425
  1,100    Sun Microsystems, Inc............................       137
                                                              --------
                                                                 1,141
                                                              --------
     COMPUTERS (NETWORKING) (1.6%)
    400    Ascend Communications, Inc.......................        33
  3,400    Cisco Systems, Inc...............................       373
                                                              --------
                                                                   406
                                                              --------
     COMPUTERS (PERIPHERALS) (1.2%)
  1,700    EMC Corp.........................................       217
  2,700    Seagate Technology, Inc..........................        80
                                                              --------
                                                                   297
                                                              --------
     COMPUTERS (SOFTWARE & SERVICES) (6.5%)
  2,100    America Online, Inc..............................       306
  1,600    BMC Software, Inc................................        59
    200    Computer Sciences Corp...........................        11
  1,300    Compuware Corp...................................        31
 12,400    Microsoft Corp...................................     1,111
  3,100    Oracle Corp......................................        82
  1,200    Parametric Technology Corp.......................        24
  1,400    Unisys Corp......................................        39
                                                              --------
                                                                 1,663
                                                              --------
     ELECTRONICS (DEFENSE) (0.3%)
  1,500    Raytheon Co., Class B............................        88
                                                              --------
     ELECTRONICS (SEMICONDUCTORS) (2.5%)
  4,700    Intel Corp.......................................       560
    800    Texas Instruments, Inc...........................        79
                                                              --------
                                                                   639
                                                              --------
     EQUIPMENT (SEMICONDUCTORS) (0.4%)
  1,600    Applied Materials, Inc...........................        99
                                                              --------
     SERVICES (DATA PROCESSING) (0.1%)
    200    Electronic Data Systems Corp.....................         9
    300    First Data Corp..................................        13
                                                              --------
                                                                    22
                                                              --------
  TOTAL TECHNOLOGY..........................................     5,095
                                                              --------
  TRANSPORTATION (1.0%)
     AIR FREIGHT (0.2%)
    500    FDX Corp.........................................        46
                                                              --------
     AIRLINES (0.6%)
    500    AMR Corp.........................................        29
    600    Delta Air Lines, Inc.............................        42
</TABLE>

- --------------------------------------------------------------------------------
U.S. Equity Plus Portfolio

                                       86
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

U.S. EQUITY PLUS PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                               VALUE
SHARES                                                         (000)
- ----------------------------------------------------------------------
<C>        <S>                                                <C>
</TABLE>

  TRANSPORTATION (CONT.)
     AIRLINES (CONT.)
<TABLE>
<C>        <S>                                                <C>
  1,600    Southwest Airlines Co............................  $     48
    400    US Airways Group, Inc............................        20
                                                              --------
                                                                   139
                                                              --------
     TRUCKERS (0.2%)
  2,200    Ryder System, Inc................................        61
                                                              --------
  TOTAL TRANSPORTATION......................................       246
                                                              --------
  UTILITIES (2.8%)
     ELECTRIC COMPANIES (2.6%)
  2,000    Cinergy Corp.....................................        55
  1,700    Edison International.............................        38
  1,300    GPU, Inc.........................................        48
  2,400    PECO Energy Co...................................       111
  3,500    PG&E Corp........................................       109
  4,200    Texas Utilities Co...............................       175
  3,700    Unicom Corp......................................       135
                                                              --------
                                                                   671
                                                              --------
     POWER PRODUCERS (INDEPENDENT) (0.2%)
  1,200    AES Corp.........................................        45
                                                              --------
  TOTAL UTILITIES...........................................       716
                                                              --------
  TOTAL COMMON STOCKS (Cost $23,192)........................    25,422
                                                              --------
</TABLE>

<TABLE>
<CAPTION>
                                                               VALUE
SHARES                                                         (000)
- ----------------------------------------------------------------------

<C>        <S>                                                <C>
  TOTAL INVESTMENTS 100.1% (Cost $23,192)...................  $ 25,422
                                                              --------
</TABLE>

<TABLE>
<S>                                                           <C>
OTHER ASSETS AND LIABILITIES (-0.1%)
  Other Assets..............................................        93
  Liabilities...............................................      (106)
                                                              --------
                                                                   (13)
                                                              --------
NET ASSETS (100%)...........................................  $ 25,409
                                                              --------
                                                              --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................    $24,076
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 1,860,007 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $12.94
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $1,333
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 103,106 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $12.93
                                                                ---------
                                                                ---------
</TABLE>

- --------------------------------------------------------------------------------
                                                      U.S. Equity Plus Portfolio

                                       87
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
U.S. REAL ESTATE PORTFOLIO

The U.S. Real Estate Portfolio seeks to provide above average current income and
long-term capital appreciation by investing primarily in equity securities of
companies in the U.S. real estate industry, including real estate investment
trusts ("REITs").

For the three months ended March 31, 1999, the Portfolio had a total return of
- -2.83% for the Class A shares and -2.92% for the Class B shares compared to a
total return of -5.59% for the National Association of Real Estate Investment
Trusts (NAREIT) Equity Index (the "Index"). For the one-year period ended March
31, 1999, the Portfolio had a total return of -13.71% for the Class A shares and
- -13.95% for the Class B shares compared to -21.75% for the Index. From inception
on February 24, 1995 through March 31, 1999, the average annual total return of
the Class A shares was 16.00% compared to 9.63% for the Index. From inception on
January 2, 1996 through March 31, 1999, the average annual total return of the
Class B shares was 13.16% compared to 7.57% for the Index.

PERFORMANCE COMPARED TO THE NATIONAL ASSOCIATION OF REAL ESTATE INVESTMENT
TRUSTS (NAREIT) EQUITY INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                   TOTAL RETURNS(2)
                      ------------------------------------------
                                      ONE       AVERAGE ANNUAL
                         YTD         YEAR       SINCE INCEPTION
                      ----------  -----------  -----------------
<S>                   <C>         <C>          <C>
PORTFOLIO -- CLASS
 A..................      -2.83%      -13.71%         16.00%
PORTFOLIO -- CLASS
 B..................      -2.92       -13.95          13.16
INDEX -- CLASS A....      -5.59       -21.75           9.63
INDEX -- CLASS B....      -5.59       -21.75           7.57
</TABLE>

1. The NAREIT Equity Index is an unmanaged market weighted index of tax
   qualified REITs listed on the New York Stock Exchange, American Stock
   Exchange and the NASDAQ National Market System, including dividends.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATION PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST.

Despite renewed levels of enthusiasm at the beginning of 1999, the REIT market
provided more of the same bad news in the first quarter of the year. The Index
posted a loss of 5.6%. The Index has now experienced a decline in excess of 27%
since hitting its all-time high in October, 1997. Once again, the decline
occurred despite public real estate companies reporting strong cashflow growth
from their properties. The pain of negative returns was amplified by the
fascination with the Dow Jones Index flirting with the 10,000 level and the
surging internet stocks. Clearly it has been difficult for any of the small cap
or value-oriented stocks to catch the attention of equity investors. In the
quarter, small cap stocks continued their under-performance relative to big cap
stocks as the Russell 2000 Index of small capitalization stocks declined 5.4%
for the quarter. As a result of this quarter's performance, it remains cheaper
for investors to buy real estate assets on Wall Street (through the ownership of
securities) than on Main Street (through the direct ownership of assets). On
average, REITs are trading 10% below the liquidation value of their portfolios
and private investors are actively exploring methods to take advantage of this
arbitrage.

Perhaps the only positive event to come from another difficult quarter was the
renewed level of interest in the public securities markets from both private and
public pension funds. These investors have established target allocations for
investment in real estate as a separate asset class. Historically, they have
placed the majority of this allocation in the direct markets (through the
purchase of real estate properties). However, many are reviewing increasing
their exposure to the indirect markets (through public real estate securities),
because they are attracted by current valuation levels. In the quarter, this new
inflow was modest compared to net redemptions by non-dedicated real estate
investors. However, it is a strong sign for the industry to expand its
shareholder base to include a greater number of dedicated real estate investors.

The first quarter featured a modest gain for the REIT market in the beginning of
January as most prognosticators unveiled their expected returns for the year,
with consensus returns in the 12% to 15% range. However, a constant and
continued decline ensued in which the REIT market declined a modest degree each
day. In contrast to last year, the quarter was devoid of any serious attempts at
gaining territory. The quarter ended with the Index approaching its 52-week low
achieved in early October, 1998.

- --------------------------------------------------------------------------------
U.S. Real Estate Portfolio

                                       88
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
U.S. REAL ESTATE PORTFOLIO (CONT.)

The continued outflow from dedicated mutual funds contributed to the sector's
declines. Total redemptions in the last three quarters of 1998 were almost $1.5
billion and the pattern continued with more than $500 million in redemptions in
the first quarter. The continued success of the broader equity markets, which
was predominantly limited to a narrow group of big cap and internet stocks, did
not bode well for real estate stocks. In addition, REITs had difficulty
positioning themselves as defensive stocks given last year's performance and the
continued declines this year. As a large number of REIT stocks approach the 10%
dividend yield level, investors have become confused as to whether the stocks
are cheap or are preparing to cut their dividend. We believe that the sector
represents a defensive asset class at a very attractive current valuation level
and will attempt to outline our thesis below. Note that in the beginning of 1998
we provided total return estimates far below the consensus as we cautioned that
the sector was not defensive given then current valuations levels.

We have previously discussed our investment perspective that, over the medium
and long term, the largest determinant of the value of shares of real estate
stocks will be underlying real estate fundamentals. We measure REITs based on
their Price to Net Asset Value per share ratio ("P/NAV"). The third quarter of
1998 was the first in which P/ NAV had fallen below 100% since early 1995. At
the end of this quarter, we are residing firmly below NAV at the 90% P/NAV
level.

The public markets are forward looking and we expect that the market will reward
the REIT market with premium valuations in the face of improving fundamentals
and will penalize REITs with prices below NAV in the anticipation of
deteriorating fundamentals. We also recognize that the public markets may not be
perfectly calibrated, which results in a tendency to overshoot on both the
upside and the downside. Thus, we believe the appropriate analysis for current
valuations in the REIT market is to answer the following question: are the
public markets betting on a deterioration in NAV or are the securities mispriced
as a result of the selling pressure by non-dedicated investors?

The key factor is an analysis of the likelihood of a deterioration in NAV. This
deterioration can come in the form of a reduction in the net operating income
("NOI") at the property level or a worsening in the cap rates (the multiple
applied to the NOI) to determine real estate prices.

Last quarter, we discussed our concerns with regard to real estate valuations.
We correctly anticipated a slowing in transaction volumes; however, our
assumption that the new clearing prices would decline by 10% or more has been
proven wrong with the exception of the hotel sector and second tier properties
and markets. As a result, it appears that cap rates have stabilized once again.
This stabilization appears to dispel the current concern over a deterioration in
cap rates. It is important to note that since the companies have increased
leverage ratios to, on average, 40%, a 5% deterioration in cap rates would
result in a 10% decrease in NAV per share.

The case for a deterioration in NOI for real estate is dependent on weak
fundamentals. Our measure for real estate fundamentals is the supply-demand
balance for real estate in each of the component markets as measured by
occupancy rates and rental levels. Demand for real estate space will be directly
affected by gross domestic product growth, job growth and business and consumer
confidence. A consensus concurs that a slowdown in the U.S. economy is
inevitable even if it has been pushed back by a number of quarters. Thus, the
operative question is the degree to which supply will slow in concert with the
eventual reduction in demand.

We can classify the various components of the U.S. real estate market into three
categories. We place the multifamily and industrial markets into the stabilized
category. These sectors were the first to achieve equilibrium and remain in a
stage of active construction that has kept pace with demand. Given the short
construction cycle for these assets, supply can react quickly to a decline in
demand, which would only cause a brief period of over-supply. The office and
hotel markets fall into the volatile category. Both were poised for a dramatic
level of over-supply by the latter part of 1998, but the pace of new planned
construction is slowing dramatically in each sector. In the office sector,
although the supply pipeline grew by 20%, it was a slower pace than the previous
period and was largely the result of developers completing projects that had
their financing commitments in place before the turmoil last fall. Similarly in
the hotel sector, the construction pipeline has fallen from 4% to 3% of existing
supply.

- --------------------------------------------------------------------------------
                                                      U.S. Real Estate Portfolio

                                       89
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
U.S. REAL ESTATE PORTFOLIO (CONT.)

Finally, the exogenous shock category best represents the status of the retail
and healthcare sectors. These sectors face an additional significant risk apart
from the typical supply-demand analysis. In retail, the concern over internet
retailing (or e-commerce) has caused shock waves through the public listed
owners of retail properties but it is not clear that it has affected the private
real estate markets. Note that retail sales via the internet were more than $10
billion in 1998 versus more than $2 trillion of total retail based sales. The
expectations for internet sales by 2003 are in excess of $100 billion, a
comparable figure to total catalog sales in the U.S. today (in our view, the
retail component most likely to be impacted by e-commerce). In the case of
healthcare, the new Medicare Prospective Payment System ("PPS") has created
financial difficulties for the operators of nursing homes. These companies have
revised earnings estimates downward in the face of complying with PPS. This has
resulted in a dramatic decline for the share prices of healthcare REITs that own
and lease nursing homes to these operators and the potential risk for a
re-pricing of the assets.

The scenario described above indicates that it is difficult to make a case for
deterioration in NOI based on over-supply. We believe the key risk is one of
under-demand. Given the current supply-demand scenario outlined above, we would
require a recession of some length in order to depress NOI by 5% (which would
reduce NAV per share by 10%). The combined result of the cap rate and NOI
analyses is that it is difficult to construct a base case that results in a
decline in NAV per share to the levels currently implied in the pricing for
public securities. We do not project an immediate catalyst for improved pricing,
but as value investors, our style is to identify mispricing opportunities and
realize the benefits over time. It is interesting to note that on the several
occasions when the REIT market has rallied in this current cycle, it tends to
run up very quickly. Thus, employing a strategy to wait on the sidelines for
evidence of a catalyst may result in an inability to enter the sector in a
meaningful fashion when the inefficiency is being realized.

Last year, as REIT prices plummeted, we introduced the concept that REITs must
compare the potential returns from their typical external growth opportunity
set, the development and acquisition of properties, versus the opportunity to
"buy" their own portfolio (based on the implied valuation as determined by their
share price) through a share repurchase program. We firmly believe that REITs
must monitor their implied valuation and utilize the analysis to determine their
external growth plans as well as their price tolerance for issuing equity. Many
companies have implemented share repurchase programs, although capital
availability has slowed the pace. Those companies that have capital availability
have taken a selective attitude and have increased targeted investment returns
as a result of treating this capital as a scarce resource. These actions also
reflect a more targeted strategic direction for REITs to focus on "value-added"
external growth. This is in contrast to the growth and expansion mentality for
many REITs in 1997, a theme predicated on the availability of cheap equity and a
private real estate market that had not yet fully recovered. The ultimate
example of a revised focus on growing NAV per share, as opposed to growing for
growth's sake, is the strategy to sell assets in the private markets and use the
proceeds to buy back stock.

The most significant evidence that REITs are mispriced would come in the form of
the Board's of cheap companies -- those trading at the greatest discount to the
liquidation value of their properties -- placing the companies for sale. The
first quarter witnessed the closing of two of these transactions in which
Storage Trust and Meridian Industrial Trust were sold, as each merged their
assets into larger public companies and eliminated management in its entirety.
In the second quarter Tower Realty will complete the sale of their assets by
merging into Reckson Associates. In addition, MGI Properties will sell the vast
majority of its assets to an undisclosed private buyer. We applaud the decision
of these companies and their Boards to sell.

Given the deterioration in share prices, there remains a serious debate as to
the viability of leveraged buyouts ("LBO's") in the sector. Since the structure
is highly dependent on cheap and plentiful financing, the apartment sector has
been the first in which investors have tested the strategy. This quarter, the
Board of Irvine Apartment Communities accepted a buyout offer from its Chairman
and largest shareholder. We considered this situation unique, given the
approximate 70% stake that the shareholder holds in the public company as well
as certain unique legal advantages granted to the shareholder at the initial
public offering. However, a

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U.S. Real Estate Portfolio

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LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
U.S. REAL ESTATE PORTFOLIO (CONT.)

second situation has arisen in which the Chairman of Berkshire Realty -- another
owner of apartments -- has made a bid to take the company private. Finally, a
well-known LBO expert, Irwin Jacobs, made an unsolicited bid for a smaller
apartment company, Cornerstone Realty. We believe that each of these
announcements illustrate the arbitrage between the private and public real
estate markets and the current mispricing.

We have continued to shape the Portfolio with companies offering attractive
fundamental valuations relative to their underlying real estate value. Given the
expected slowdown in the demand for real estate, we have maintained a modestly
defensive posture. However, we are encouraged by the undeniable strength of the
U.S. economy and have become more constructive with regard to the likelihood
that real estate fundamentals will remain favorable. As a result, from a
top-down perspective, we have increased our overweighting to the office sector,
decreased our underweighting to the hotel sectors, and decreased our
overweighting to the less volatile residential housing sectors (both apartments
and manufactured home communities). Once again we took advantage of a weak
market and price declines to add a number of the most talented companies in the
REIT universe to the Portfolio, including Simon Property Group, Prologis and
Boston Properties.

Theodore R. Bigman
PORTFOLIO MANAGER

Douglas A. Funke
PORTFOLIO MANAGER

April 1999

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INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

U.S. REAL ESTATE PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                 VALUE
 SHARES                                                          (000)
<C>          <S>                                                <C>
- -----------------------------------------------------------------------

COMMON STOCKS (95.4%)
  DIVERSIFIED (9.6%)
  333,700    Crescent Real Estate Equities, Inc. REIT.........  $7,175
  354,000    Pacific Gulf Properties, Inc. REIT...............   6,372
  230,500    Pennsylvania REIT................................   4,307
  115,100    Rouse Co. REIT...................................   2,554
   35,600    Vornado Realty Trust REIT........................   1,228
  654,898    Wellsford Real Properties, Inc...................   5,730
                                                                -------
                                                                27,366
                                                                -------
  HEALTH CARE (0.8%)
  190,300    Meditrust Corp. REIT.............................   2,367
                                                                -------
  LODGING/RESORTS (4.5%)
  106,500    Candlewood Hotel Company, Inc....................     426
   12,070    Crestline Capital Corp...........................     185
  308,800    Host Marriot Corp................................   3,435
  108,300    John Q Hammons Hotels, Inc., Class A.............     393
  995,454    Patriot American Hospitality, Inc. REIT..........   5,102
  109,937    Starwood Lodging Trust REIT......................   3,140
                                                                -------
                                                                12,681
                                                                -------
  OFFICE INDUSTRIAL (33.3%)
     INDUSTRIAL (5.1%)
  412,400    Prime Group Realty Trust REIT....................   5,464
  441,260    ProLogis Trust REIT..............................   9,046
                                                                -------
                                                                14,510
                                                                -------
     OFFICE/INDUSTRIAL MIXED (2.6%)
  218,710    PS Business Parks, Inc. REIT.....................   4,798
   74,600    Spieker Properties, Inc. REIT....................   2,630
                                                                -------
                                                                 7,428
                                                                -------
     OFFICE (25.6%)
  484,500    Arden Realty, Inc. REIT..........................  10,780
  335,100    Beacon Capital Partners, Inc.....................   6,702
  143,500    Boston Properties, Inc. REIT.....................   4,538
  515,754    Brandywine Realty Trust REIT.....................   8,381
  788,797    Brookfield Properties Corp. (Canada).............   9,318
  265,030    CarrAmerica Realty Corp. REIT....................   5,847
  217,600    Cornerstone Properties, Inc......................   3,183
  308,427    Equity Office Properties Trust REIT..............   7,846
  598,300    Great Lakes, Inc. REIT...........................   8,675
   71,800    Highwoods Properties, Inc........................   1,692
  108,600    Mack-Cali Realty Corp. REIT......................   3,190
   93,700    Prentiss Properties Trust REIT...................   1,745
   55,500    SL Green Realty Corp. REIT.......................   1,044
                                                                -------
                                                                72,941
                                                                -------
  TOTAL OFFICE INDUSTRIAL.....................................  94,879
                                                                -------

<CAPTION>
                                                                 VALUE
 SHARES                                                          (000)
<C>          <S>                                                <C>
- -----------------------------------------------------------------------

  OTHER (2.2%)
  580,384    Atlantic Gulf Communities Corp...................  $  987
   22,530    Merry Land Properties, Inc.......................     132
  375,700    Security Capital Group, Inc., Class B............   5,025
                                                                -------
                                                                 6,144
                                                                -------
  RESIDENTIAL (24.1%)
     RESIDENTIAL APARTMENTS (18.3%)
   97,000    Amli Residential Properties Trust REIT...........   2,001
  166,100    Apartment Investment & Management Co. REIT.......   6,021
  318,510    Archstone Communities Trust REIT.................   6,410
  380,500    Avalon Bay Communities, Inc. REIT................  12,033
  143,318    Equity Residential Properties Trust REIT.........   5,912
  341,300    Essex Property Trust, Inc. REIT..................   8,917
   51,800    Irvine Apartment Communities, Inc. REIT..........   1,703
  204,700    Smith (Charles E.) Residential Realty, Inc.
               REIT...........................................   6,307
  157,900    Summit Properties, Inc...........................   2,635
                                                                -------
                                                                51,939
                                                                -------
     RESIDENTIAL MANUFACTURED HOMES (5.8%)
  544,752    Chateau Communities, Inc. REIT...................  14,981
   61,800    Manufactured Home Communities, Inc. REIT.........   1,483
    1,500    Sun Communities, Inc. REIT.......................      47
                                                                -------
                                                                16,511
                                                                -------
  TOTAL RESIDENTIAL...........................................  68,450
                                                                -------
  RETAIL (17.7%)
     RETAIL REGIONAL MALLS (9.6%)
  132,800    Acadia Realty Trust REIT.........................     697
    7,500    Mills Corp. REIT.................................     134
    8,200    Philips International Realty Corp. REIT..........     116
  406,000    Simon Property Group, Inc. REIT..................  11,140
  931,078    Taubman Centers, Inc. REIT.......................  11,406
  135,900    Urban Shopping Centers, Inc. REIT................   3,899
                                                                -------
                                                                27,392
                                                                -------
     RETAIL STRIP CENTERS (8.1%)
  942,390    Burnham Pacific Property Trust REIT..............   9,895
   63,600    Developers Diversified Realty Corp...............     910
  450,500    Federal Realty Investment Trust REIT.............   9,545
  145,700    Pan Pacific Retail Properties Inc. REIT..........   2,586
    2,300    Ramco-Gershenson Properties Trust REIT...........      37
    2,000    Regency Realty Corp. REIT........................      38
                                                                -------
                                                                23,011
                                                                -------
  TOTAL RETAIL................................................  50,403
                                                                -------
  SELF STORAGE (3.2%)
  312,366    Public Storage, Inc. REIT........................   7,809
   56,300    Shurgard Storage Centers, Inc., Series A REIT....   1,422
                                                                -------
                                                                 9,231
                                                                -------
TOTAL COMMON STOCKS (Cost $294,280)...........................  271,521
                                                                -------
</TABLE>

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INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

U.S. REAL ESTATE PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                 VALUE
 SHARES                                                          (000)
<C>          <S>                                                <C>
- -----------------------------------------------------------------------

PREFERRED STOCKS (0.8%)
  RETAIL (0.8%)
     RETAIL STRIP CENTERS (0.8%)
   80,400    First Washington Realty Trust, Series A REIT
               (Cost $2,251)..................................  $2,181
                                                                -------
CONVERTIBLE PREFERRED STOCKS (0.6%)
  OTHER (0.6%)
  107,021    Atlantic Gulf Communities Corp...................   1,010
   75,765    Altantic Gulf Communities Corp., Series B........     715
                                                                -------
TOTAL CONVERTIBLE PREFERRED STOCKS (COST $1,828)..............   1,725
                                                                -------
</TABLE>

<TABLE>
<CAPTION>
 NO. OF
WARRANTS
<C>          <S>                                                <C>
- ---------
WARRANTS (0.0%)
  OTHER (0.0%)
  112,509    Atlantic Gulf Communities Corp., Class A,
               expiring 6/24/04...............................      35
  112,509    Atlantic Gulf Communities Corp., Class B,
               expiring 6/24/04...............................      35
  112,509    Atlantic Gulf Communities Corp., Class C,
               expiring 6/24/04...............................      35
                                                                -------
TOTAL WARRANTS (COST $0)......................................     105
                                                                -------
</TABLE>

<TABLE>
<CAPTION>
  FACE
 AMOUNT                                                          VALUE
  (000)                                                          (000)
<C>          <S>                                                <C>
- -----------------------------------------------------------------------

CORPORATE BONDS (0.9%)
  OFFICE INDUSTRIAL (0.9%)
     OFFICE (0.9%)
$   2,934    Brookfield Properties Corp. (Canada), 6.00%,
               2/14/07 (Cost $2,264)..........................  $2,478
                                                                -------
SHORT-TERM INVESTMENT (1.4%)
  REPURCHASE AGREEMENT (1.4%)
    3,895    Chase Securities, Inc. 4.65%, dated 3/31/99, due
               4/01/99, to be repurchased at $3,896,
               collateralized by U.S. Treasury Bonds, 8.00%
               due 11/15/21, valued at $3,989 (Cost $3,895)...   3,895
                                                                -------
TOTAL INVESTMENTS (99.1%) (Cost $304,518).....................  281,905
                                                                -------
</TABLE>

<TABLE>
<S>                                                               <C>
OTHER ASSETS AND LIABILITIES (0.9%)
  Other Assets..................................................     3,584
  Liabilities...................................................      (986)
                                                                  ---------
                                                                     2,598
                                                                  ---------
NET ASSETS (100%)...............................................  $284,503
                                                                  ---------
                                                                  ---------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................    $272,247
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 22,048,791 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $12.35
                                                                ----------
                                                                ----------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $12,256
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 996,270 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $12.30
                                                                ----------
                                                                ----------
</TABLE>

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

REIT  --  Real Estate Investment Trust

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LETTER TO SHAREHOLDERS
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VALUE EQUITY PORTFOLIO

The Value Equity Portfolio seeks long-term capital appreciation by investing
primarily in equity securities which the Investment advisor believes to be
undervalued relative to the stock market in general at the time of purchase.

Our value investment philosophy for the Value Equity Portfolio is based on the
premise that a diversified portfolio of undervalued securities should outperform
the market over the long-term, and would be expected to preserve principal in a
difficult market environment. Our Portfolio is characterized by a distinctly
below average price-to-earnings ratio, price-to-book ratio, and a high dividend
yield.

PERFORMANCE COMPARED TO THE S&P 500 INDEX AND THE INDATA EQUITY-MEDIAN INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                         TOTAL RETURNS(2)
                        --------------------------------------------------
                                                                AVERAGE
                                                  AVERAGE        ANNUAL
                                                   ANNUAL        SINCE
                           YTD       ONE YEAR    FIVE YEARS    INCEPTION
                        ----------  ----------  ------------  ------------
<S>                     <C>         <C>         <C>           <C>
PORTFOLIO -- CLASS
 A....................       4.36%       0.09%       19.06%        14.31%
PORTFOLIO -- CLASS
 B....................       4.37       -0.14          N/A         18.36
S&P 500 INDEX -- CLASS
 A....................       4.98       18.45        26.24         19.08
S&P 500 INDEX -- CLASS
 B....................       4.98       18.45          N/A         27.45
INDATA EQUITY-MEDIAN
 INDEX -- CLASS A.....       1.65        8.35        21.12         16.64
INDATA EQUITY-MEDIAN
 INDEX -- CLASS B.....       1.65        8.35          N/A         21.94
</TABLE>

1. The S&P 500 Index is comprised of 500 large-cap U.S. companies with market
   capitalization of $1 billion or more. These 500 companies are a
   representative sample of some 100 industries chosen mainly for market size,
   liquidity and industry group representation. The Indata Equity-Median Index
   is an unmanaged index of common stocks. The Indata Equity-Median Index
   includes an average asset allocation of 92.0% equity and 8.0% cash based on
   $48.1 billion in assets among 1,228 portfolios for the period ended March 31,
   1999.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST.

For the three months ended March 31, 1999, the Portfolio had a total return of
4.36% for the Class A shares and 4.37% for the Class B shares compared to a
total return of 4.98% for the S&P 500 Index and 1.65% for the Indata
Equity-Median Index. For the one-year period ended March 31, 1999, the Portfolio
had a total return of 0.09% for the Class A shares and -0.14% for the Class B
shares compared to a total of 18.45% for the S&P 500 Index and 8.35% for the
Indata Equity-Median Index. For the five-year period ended March 31, 1999, the
average annual total return of Class A shares was 19.06% compared to 26.24% for
the S&P 500 Index and 21.12% for the Indata Equity-Median Index. From inception
on January 31, 1990 through March 31, 1999, the average annual total return of
Class A shares was 14.31% compared to 19.08% for the S&P 500 Index and 16.64%
for the Indata Equity-Median Index. From inception on January 2, 1996 through
March 31, 1999, the average annual total return of Class B shares was 18.36%
compared to 27.45% for the S&P 500 Index and 21.94% for the Indata Equity-Median
Index.

For the three months ended, the S&P/Barra Growth Index returned 7.0%, and the
S&P/Barra Value Index returned 2.7%. Equally weighted, the S&P 500 returned
1.3%. The small-cap Indexes were down 5.5% (Russell 2000) and 8.4% (S&P
Small-Cap). The worst performing sectors were (S&P) Utilities, down 10% and
(Small-cap) Value, down 10%.

For the Portfolio, the best performing stocks were Sprint-PCS, up 92%, Nielsen
Media Research, up 82% (an internet/media company that has current earnings that
we added at a 12 price/earnings last fall), United Technologies, up 25%, Lincoln
National, up 22% and TJX Companies, up 17%. The worst performing stocks were
Philip Morris, down 33%, Meritor Automotive (now a 6 P-E), down 26%, Loews, down
24%, Harris, down 21%, and Gulf Stream Aerospace, down 19% (26% earnings per
share growth, upward earnings estimates, and now a 10 price/earnings).

Overall performance was a telescoped version of the last few years: a narrow
market increasingly driven by and valued by, a small number of mega-cap stocks
with high and increasing valuations. For the quarter the S&P 100 was up 7.3%,
over 15% better than the S&P Small-Cap Index which was down 8.4%. This quarter
also saw the emergence of the mania in Internet stocks (more on the Internet
below).

Performance in the Portfolio was driven by the recovery in four of our large
value holdings: TJMaxx, Lincoln National, United Technologies and Philips
Electronics. We also had help from wireless.

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        Institutional Fund, Inc.
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LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
VALUE EQUITY PORTFOLIO (CONT.)

Lincoln National rose on the news that Aegon, a global Dutch insurer, is buying
Transamerica; highlighting the attraction as well as the scarcity of high
quality US-based financial/insurance companies. TJMaxx's performance was a
recovery from the economic slowdown scare in the third quarter of 1998 (which is
when TJMaxx was added to the Portfolio). United Technologies and Philips
recovered based on good 1998 fourth quarter earnings and solid expectations for
1999. Sprint-PCS return reflected the value of a nationwide wireless service.
Based on valuation we sold Sprint-PCS and purchased Telesp Celular
Participacoes, a Brazilian cellular company spun off from Telebras, the
Brazilian telecommunications company, and added to our Sprint holdings.

Our biggest positions are AT&T, Sprint, United Technologies, Lincoln National,
and Chase Manhattan. These five stocks account for 22% of the Portfolio's net
assets. The top 10 positions have similar characteristics and comprise 41% of
the Portfolio and include TJMaxx, BankBoston, Allstate, Bell Atlantic, and
Philips Electronics. These top 10 comprise the core of the Portfolio.

This quarter we added to our holding of broadband and wireless stocks when
liquidity-driven or momentum selling created discounts to the markets. We added
the following companies at average price/ earnings of 22 and price-to-sales of
2: 3Com (networking), Newbridge Networks (ATM switches), FORE Systems (ATM
switches). We believe these are reasonable valuations for high quality broadband
stocks.

Here is why we have added this basket of stocks that total 2.5% to 3% of the
Portfolio net assets, while still maintaining a portfolio price/earnings of 15.

THE i.NET ECONOMY

The "Internet" has grown faster than any other technology. Internet traffic is
doubling every three-to-twelve months. Why? The structure of the Internet lets
any device (PC, Mainframe, PDA, Cell Phone) connect to any other device anywhere
in the world. And, much like voice mail, the connection is not time dependent;
you can connect at any time on any day. The connection can then carry data,
voice, and video. The data arrives in discreet packets that are very cheap to
transport relative to existing dedicated phone circuits. This structure has
enormous implications for how business-to-business transactions occur and how
consumers buy services.

The power of the Internet is based on data/ telecommunications protocols (rules)
known by the acronym TCP/IP, which stands for Transmission Control
Protocol/Internet Protocol. The protocols are the same worldwide. While the
current surge in Internet demand has led to exponential growth in demand for
computer servers (SUN, HP, IBM et.al.) and telecommunications bandwidth (WCOM,
AT&T, Sprint. et.al.), the core of the Internet is based on open standards.
There are no monopolies. Anyone can compete by writing a better browser, putting
up a better portal, or selling a product cheaper (DELL, Amazon).

This leads to the question of which companies win, and which companies struggle
with more competition and lower margins. The next question is can a low
price/earnings and high yield Value manager position a Value portfolio to
benefit from the changes the Internet is bringing.

We believe yes. We are looking for businesses such as Allstate and Countrywide
Credit where scale and technology allow the high quality/low cost producers to
get to more customers at less cost. They both currently sell at less than 11
price/ earnings. We can also own broadband backbone companies like Sprint and
AT&T, broadband consumer companies like AT&T, and broadband infrastructure
companies such as 3Com, Newbridge Networks, and FORE Systems. These companies
are valued at reasonable multiples of earnings (yes, they have them) and sales.

For the rest of the Internet companies (sometimes know as .COM companies) the
following quiz may be interesting.

THE i.NET QUIZ

Below are statements in public offerings. Three are from recent IPO's and the
fourth is from The South-Sea Bubble in England in the 1700's. Can you match the
statements with the sources?

Statements:

1.We may never generate significant revenues or be profitable.

2.We expect to continue to incur substantial losses for the foreseeable future.

3.A company for carrying on an undertaking of great advantage, but nobody knows
  what it is.

4.We have recently made public statements upon which you should not rely.

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LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
VALUE EQUITY PORTFOLIO (CONT.)

Sources:

1.Ivillage Inc. IPO (IPO price @ $24, current $119)

2.EXTRA ORDINARY POPULAR DELUSIONS AND THE MADNESS OF CROWDS, Charles Mackay.

3.Value America IPO (IPO price @ 23, current $50)

The current mania has pushed IPO's, Internet stocks, and large cap growth stocks
to valuation levels that are extraordinary by any measure. Here are the top ten
stocks in the S&P 500 and the expected 1999 price/earnings.

<TABLE>
<CAPTION>
             COMPANY                WEIGHT % INDEX    P-E 99
- ----------------------------------  ---------------  ---------
<S>                                 <C>              <C>
Microsoft.........................        4.2           68
General Electric..................        3.2           37
Wal-Mart..........................        1.9           46
Intel.............................        1.9           26
Merck.............................        1.7           34
Pfizer............................        1.7           60
Cisco.............................        1.6           78
Exxon.............................        1.6           29
AT&T..............................        1.5           26
IBM...............................        1.5           24
Average (arithmetic)..............                      43
</TABLE>

While the current mania has pushed the above stocks and the market indexes which
they now dominate to historically high valuation levels, a large percentage of
stocks are trading at very attractive valuations.

We have a bifurcated market. For example, Cordant Technologies is growing
earnings between 8% and 10% and is selling at a price/earnings of 10. Meritor
Automotive, recently spun off from Rockwell International, has a strong
management team, and is growing by acquisition in a consolidating, but growing,
market; it is selling at a price/earnings of 6. The upcoming merger between
Fleet and BankBoston is an in-market merger of two strong franchises, combined
with BankBoston's profitable Latin America businesses, yet the companies sell at
a price/earnings of 13. The core of our Portfolio is comprised of stocks like
these, and the Portfolio's conservative valuation and yield reflect this with a
price/earnings (99) of 15 and a dividend yield of 1.9%.

Stephen C. Sexauer
PORTFOLIO MANAGER

April 1999

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Value Equity Portfolio

                                       96
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        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

VALUE EQUITY PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
                                                                VALUE
 SHARES                                                         (000)
<C>         <S>                                                <C>
- -----------------------------------------------------------------------

COMMON STOCKS (98.1%)
  BASIC MATERIALS (4.7%)
     CHEMICALS (SPECIALTY) (1.4%)
  33,200    Milennium Chemicals, Inc.........................  $    660
                                                               --------
     CONSTRUCTION (CEMENT & AGGREGATES) (0.9%)
   8,300    Southdown, Inc...................................       446
                                                               --------
     METALS MINING (2.4%)
  81,700    USEC, Inc........................................     1,113
                                                               --------
  TOTAL BASIC MATERIALS......................................     2,219
                                                               --------
  CAPITAL GOODS (11.2%)
     AEROSPACE/DEFENSE (4.7%)
  31,000    Cordant Technologies, Inc........................     1,234
  18,400    Gulfstream Aerospace Corp........................       798
   3,000    Northrop Grumman Corp............................       180
                                                               --------
                                                                  2,212
                                                               --------
     MACHINERY (DIVERSIFIED) (2.3%)
  43,800    Case Corp........................................     1,112
                                                               --------
     MANUFACTURING (DIVERSIFIED) (4.2%)
  14,600    United Technologies Corp.........................     1,977
                                                               --------
  TOTAL CAPITAL GOODS........................................     5,301
                                                               --------
  COMMUNICATION SERVICES (14.6%)
     TELECOMMUNICATIONS (CELLULAR/WIRELESS) (0.9%)
  21,400    Telesp Celular Participacoes S.A.................       448
                                                               --------
     TELECOMMUNICATIONS (LONG DISTANCE) (8.9%)
  27,752    AT&T Corp........................................     2,215
  20,600    Sprint Corp......................................     2,021
                                                               --------
                                                                  4,236
                                                               --------
     TELEPHONE (4.8%)
  34,400    Bell Atlantic Corp...............................     1,778
   9,100    U.S. WEST, Inc...................................       501
                                                               --------
                                                                  2,279
                                                               --------
  TOTAL COMMUNICATIONS SERVICES..............................     6,963
                                                               --------
  CONSUMER CYCLICALS (14.0%)
     AUTO PARTS & EQUIPMENT (2.4%)
  73,066    Meritor Automotive, Inc..........................     1,132
                                                               --------
     AUTOMOBILES (2.1%)
  11,600    General Motors Corp..............................     1,008
                                                               --------
     PUBLISHING (NEWSPAPERS) (0.5%)
   9,300    News Corp., Ltd ADR..............................       256
                                                               --------
     RETAIL (SPECIALTY) (4.0%)
  55,600    TJX Cos., Inc....................................     1,890
                                                               --------
     SERVICES (ADVERTISING/MARKETING) (1.1%)
  32,620    R.H. Donnelly Corp...............................       504
                                                               --------

<CAPTION>

                                                                VALUE
 SHARES                                                         (000)
<C>         <S>                                                <C>
- -----------------------------------------------------------------------

     SERVICES (COMMERCIAL & CONSUMER) (3.9%)
  52,633    Nielsen Media Research Inc.......................  $  1,299
  23,000    Ogden Corp.......................................       554
                                                               --------
                                                                  1,853
                                                               --------
  TOTAL CONSUMER CYCLICALS...................................     6,643
                                                               --------
  CONSUMER STAPLES (0.7%)
     TOBACCO (0.7%)
  10,000    Philip Morris Cos., Inc..........................       352
                                                               --------
  ENERGY (5.0%)
     OIL & GAS (REFINING & MARKETING) (0.4%)
   4,300    Ashland, Inc.....................................       176
                                                               --------
     OIL (DOMESTIC INTEGRATED) (4.6%)
   4,100    BP Amoco plc ADR.................................       414
  56,500    Conoco, Inc......................................     1,388
  14,000    USX-Marathon Group...............................       385
                                                               --------
                                                                  2,187
                                                               --------
  TOTAL ENERGY...............................................     2,363
                                                               --------
  FINANCIAL (29.4%)
     BANKS (MAJOR REGIONAL) (10.3%)
  42,400    BankBoston Corp..................................     1,836
  33,800    Fleet Financial Group, Inc.......................     1,272
  12,700    Mellon Bank Corp.................................       894
  16,200    PNC Bank Corp....................................       900
                                                               --------
                                                                  4,902
                                                               --------
     BANKS (MONEY CENTER) (4.0%)
  23,200    Chase Manhattan Corp.............................     1,886
                                                               --------
     CONSUMER FINANCE (1.0%)
  12,800    Countrywide Credit Industries, Inc...............       480
                                                               --------
     FINANCIAL (DIVERSIFIED) (2.7%)
  18,200    American General Corp............................     1,283
                                                               --------
     INSURANCE (MULTI-LINE) (7.0%)
  20,000    Lincoln National Corp............................     1,977
  17,900    Loews Corp.......................................     1,336
                                                               --------
                                                                  3,313
                                                               --------
     INSURANCE (PROPERTY-CASUALTY) (3.8%)
  48,800    Allstate Corp....................................     1,809
                                                               --------
     INVESTMENT BANKING & BROKERAGE (0.6%)
   6,667    Bear Stearns Cos., Inc...........................       298
                                                               --------
  TOTAL FINANCIAL............................................    13,971
                                                               --------
  HEALTH CARE (2.8%)
     HEALTH CARE (MEDICAL PRODUCTS & SUPPLIES) (2.8%)
  20,500    Bausch & Lomb, Inc...............................     1,332
                                                               --------
</TABLE>

- --------------------------------------------------------------------------------
                                                          Value Equity Portfolio

                                       97
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

VALUE EQUITY PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                VALUE
 SHARES                                                         (000)
- -----------------------------------------------------------------------
<C>         <S>                                                <C>
  TECHNOLOGY (9.7%)
     COMMUNICATION EQUIPMENT (1.4%)
  14,550    Harris Corp......................................  $    416
  10,400    Telefonaktiebolaget LM Ericsson ADR..............       248
                                                               --------
                                                                    664
                                                               --------
     COMPUTERS (NETWORKING) (2.1%)
   8,900    3Com Corp........................................       207
  17,700    FORE Systems, Inc................................       335
   4,700    Newbridge Networks Corp..........................       456
                                                               --------
                                                                    998
                                                               --------
     ELECTRONICS (COMPONENT DISTRIBUTORS) (3.3%)
  19,300    Philips Electronics N. V. (NY Shares)............     1,591
                                                               --------
     ELECTRONICS (DEFENSE) (2.3%)
  18,800    Litton Industries, Inc...........................     1,081
                                                               --------
     ELECTRONICS (SEMICONDUCTORS) (0.6%)
   2,678    Texas Instruments, Inc...........................       266
                                                               --------
  TOTAL TECHNOLOGY...........................................     4,600
                                                               --------
  TRANSPORTATION (2.2%)
     AIRLINES (2.2%)
  27,700    Continental Airlines, Inc., Class B..............     1,052
                                                               --------
  UTILITIES (3.8%)
     ELECTRIC COMPANIES (3.8%)
  52,700    NIPSCO Industries, Inc...........................     1,423
  10,800    Pinnacle West Capital Corp.......................       393
                                                               --------
  TOTAL UTILITIES............................................     1,816
                                                               --------
TOTAL COMMON STOCKS (Cost $37,164)...........................    46,612
                                                               --------
</TABLE>

<TABLE>
<CAPTION>
  FACE
 AMOUNT
 (000)
<C>         <S>                                                <C>
- --------

SHORT-TERM INVESTMENT (1.9%)
  REPURCHASE AGREEMENT (1.9%)
$    907    Chase Securities, Inc. 4.65%, dated 3/31/99, due
              4/01/99, to be repurchased at $907,
              collateralized by U.S. Treasury Bonds, 7.125%,
              due 2/15/23, valued at $914 (Cost $907)........       907
                                                               --------
TOTAL INVESTMENTS (100.0%) (Cost $38,071)....................    47,519
                                                               --------
</TABLE>

<TABLE>
<CAPTION>
                                                                             VALUE
                                                                             (000)
<S>                                                               <C>       <C>
- ------------------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (0.0%)
  Other Assets..................................................            $    111
  Liabilities...................................................                (100)
                                                                            --------
                                                                                  11
                                                                            --------
NET ASSETS (100%).........................................................  $ 47,530
                                                                            --------
                                                                            --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................     $46,596
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 4,142,332 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $11.25
                                                                ----------
                                                                ----------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................        $934
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 83,313 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $11.22
                                                                ----------
                                                                ----------
</TABLE>

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

ADR   --  American Depositary Receipt

- --------------------------------------------------------------------------------
Value Equity Portfolio

                                       98
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EMERGING MARKETS DEBT PORTFOLIO

The investment objective of the Emerging Markets Debt Portfolio is high total
return through investment primarily in debt securities of government,
government-related and corporate issuers located in emerging countries.

PERFORMANCE COMPARED TO THE J.P. MORGAN
EMERGING MARKETS BOND PLUS INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                               TOTAL RETURNS(2)
                     -------------------------------------
                                                AVERAGE       AVERAGE
                                              ANNUAL FIVE   ANNUAL SINCE
                        YTD       ONE YEAR       YEARS       INCEPTION
                     ----------  ----------  -------------  ------------
<S>                  <C>         <C>         <C>            <C>
PORTFOLIO -- CLASS
 A.................       4.60%     -36.53%       10.35%          5.43%
PORTFOLIO -- CLASS
 B.................       3.76      -36.46          N/A           5.12
INDEX -- CLASS A...       5.06      -14.47        13.06           7.62
INDEX -- CLASS B...       5.06      -14.47          N/A          10.94
</TABLE>

1. The J.P. Morgan Emerging Markets Bond Plus Index is a total return index
   tracking the traded U.S. dollar denominated debt instruments in the emerging
   markets. The index is composed of Brady Bonds, benchmark Eurobonds, loans and
   Argentine domestic debt.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK
CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTMENT. YIELDS WILL FLUCTUATE
AS MARKET CONDITIONS CHANGE.

For the three months ended March 31, 1999, the Portfolio had a total return of
4.60% for the Class A shares and 3.76% for the Class B shares compared to a
total return of 5.06% for the J.P. Morgan Emerging Markets Bond Plus Index (the
"Index"). For the one-year period ended March 31, 1999, the Portfolio had a
total return of -36.53% for the Class A shares and -36.46% for the Class B
shares compared to -14.47% for the Index. For the five-year period ended March
31, 1999, the average annual total return of Class A shares was 10.35% compared
to 13.06% for the Index. From inception on February 1, 1994 through March 31,
1999, the average annual total return of Class A shares was 5.43% compared to
7.62% for the Index. From inception on January 2, 1996 through March 31, 1999,
the average annual total return of Class B shares was 5.12% compared to 10.94%
for the Index. As of March 31, 1999, the Portfolio had a SEC 30-day yield of
14.69% for the Class A shares and 15.12% for the Class B shares.

During the first quarter of 1999, emerging market investors decided that many of
the negative external factors overhanging the market were reflected in debt
prices and that the worst in terms of economic conditions would soon pass. As a
result, despite a poor start, the Portfolio had a strong rebound during the
latter part of the first quarter of 1999. The challenges facing emerging market
countries as they entered 1999 were daunting. The prospects for lower OECD
growth, continued weak commodity prices, global excess capacity and rising
deficits were enough to discourage even the most optimistic investor. However,
OECD growth as a whole held up a little better than expected during the first
quarter. The Japanese economy stabilized, at least temporarily, which helped to
underpin a modest recovery in most of the economies of Emerging Asia. The U.S.
economy continued to perform above trend while weakness was evident only in the
Euro block countries. Another positive surprise was higher oil prices, which
resulted from a mid-March OPEC agreement to cut oil production. This development
eased the fiscal pressures burdening many of the commodity exporting countries
this year. While base metals and other commodity prices remain weak, the 45%
move in the price of oil since the beginning of the year will serve as a
windfall to emerging countries such as Ecuador, Mexico, Russia and Venezuela.
Still, global excess oil capacity remains high and the moderate OECD growth
rates won't materially improve the outlook for oil. But to their credit,
emerging countries have by and large made the necessary adjustments to cope with
the realities of lower revenues from commodity exports and higher costs of
capital.

During the month of January, emerging markets debt as measured by the Index sold
off by 3.7%, with spreads widening by 137 basis points to +1,288 basis points
over comparable U.S. Treasury securities. The Portfolio benefited from
underweight positions in Ecuador, Brazil and Venezuela, the three worst
performing countries for the month. Portfolio performance was enhanced by
overweights in Mexico and Bulgaria, and to a lesser extent South Korea, as
assets rallied in response to an upward revision in the country's credit rating
and outlook by S&P.

- --------------------------------------------------------------------------------
                                                 Emerging Markets Debt Portfolio

                                       99
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EMERGING MARKETS DEBT PORTFOLIO (CONT.)

An underweight in Poland and Nigeria, the only other countries to post positive
returns in January, detracted from performance. Also during January, Brazil
floated its currency. The real subsequently depreciated 42% during the month.
The immediate economic fallout will be felt in the form of a deeper economic
contraction, higher inflation, higher interest rates and a deteriorating public
sector debt dynamic. The Brazilians will need to make further fiscal cuts and
adhere to tighter monetary policy to combat the short-term negative effects of
the devaluation.

For the month of February, the Index returned 1.44% during the same period.
Latin America led the market higher as Brazil, Peru and Venezuela were among the
top four performers during the month. Bulgaria, with a 4.22% return, was the
only non-Latin country to post strong positive returns. Latin America also
produced one of the worst performers of the month as Ecuador sold off by 9.67%
due to a deteriorating fiscal and political environment, which has reduced the
prospects for IMF aid this year. Ecuadorian bonds are trading at distressed
levels reflecting the fact that without multi-lateral aid, the probability of
default this year is high. Russia was the only country to fair worse, returning
- -9.76% for the month, as investors continued to doubt the government's ability
to service its external debt. Since the crisis last summer, the Russians have
not articulated a coherent economic policy framework. In the absence of such a
framework, the prospects for hyperinflation and continued capital flight remain
high. Portfolio returns were aided by overweights in Bulgaria, Turkey, Colombia
and, to a lesser extent, Peru. Underperformance attributable to underweight
positions in Brazil and Venezuela was mitigated somewhat by beneficial security
selection within those countries.

Emerging markets debt staged a significant rally in the month of March. The
broad market as measured by the Index rallied by 7.57%, with spreads tightening
by 159 basis points to 1,171 basis points over U.S. Treasuries. The market was
led higher by the riskier Latin American credits, with Brazil, Ecuador and
Venezuela producing the best returns for the month. Despite a positive 14.87%
return in March, Ecuadorian assets remain the worst performers in 1999, as
Ecuador has returned -7.98% year to date. In general, the Portfolio rallied in
March as many of the negative events that had been anticipated by investors
failed to materialize. Inflation in Brazil, while still high by most standards,
was tamer than expected allowing the Central Bank to lower domestic interest
rates sooner than had been anticipated. The current government in Ecuador was
able to piece together a fragile political coalition in support of a fiscal
reform package that is a pre-condition to any agreement with the IMF. While the
situation remains tenuous and banking sector reform still needs to be addressed,
the formation of this coalition is a significant first step towards reform and
again was unanticipated by the general market. Lastly, the recent rebound in the
price of oil had a significant positive impact on Venezuelan, Mexican and
Russian assets.

The conflict in Kosovo proved to be the only cloud hanging over the Portfolio in
March. Bulgarian assets bore the brunt of investors' fears, as the Bulgarian
sub-index sold off by 2.99%, making it the only country to produce negative
returns last month. While Bulgaria shares a border with Serbia, the trade links
between the countries are limited. Exports to Yugoslavia account for
approximately 2.2% of Bulgaria's total exports. However, most of the trade
routes from Bulgaria to Western Europe run through Yugoslavia and are now
effectively closed due to the war. Bulgarian goods must now be transported by a
more circuitous route, which will hinder trade flows in the future. In addition,
fears that the war will spread and destabilize the entire Balkan region
adversely impacted Bulgaria's performance. An overweight in Bulgarian assets and
an underweight in Venezuelan assets dampened Portfolio returns in March.

This confluence of positive external developments mentioned above helped propel
emerging debt prices during the first quarter and is likely to continue to
provide the necessary environment for a continued rally in the months ahead.
However, these conditions remain fragile. It may only be a matter of months
before OPEC quotas are ignored and the recent run up in oil prices reverses. The
nascent recovery in Japan appears to us to have been driven by last summer's
fiscal stimulus package. The effects of the government works spending became
visible during the fourth quarter of 1998 and the first quarter of 1999. All
other sectors of the economy continued to decline. So far, Brazil has

- --------------------------------------------------------------------------------
Emerging Markets Debt Portfolio

                                      100
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
EMERGING MARKETS DEBT PORTFOLIO (CONT.)

done an estimable job of managing investor expectations and market
technicalities. However, the difficult tasks of holding the line on fiscal cuts
and implementing structural reforms remain ahead. In short, the developments in
March were undoubtedly positive for the market, but the gains may be fleeting.
Therefore we will shift to a more aggressive posture only upon further evidence
that these positive trends are sustainable.

Thomas L. Bennett
PORTFOLIO MANAGER

Stephen F. Esser
PORTFOLIO MANAGER

Abigail L. McKenna
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
                                                 Emerging Markets Debt Portfolio

                                      101
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        Institutional Fund, Inc.
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INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING MARKETS DEBT PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
       FACE
      AMOUNT                                                               VALUE
       (000)                                                               (000)
<C>                    <S>                                                <C>
- ----------------------------------------------------------------------------------

DEBT INSTRUMENTS (95.6%)
  ARGENTINA (19.2%)
     CORPORATE (2.1%)
    ARP      (e)950    CIA International Telecommunications, 10.375%,
                         8/01/04........................................  $    737
U.S.$        (e)391    Nortel Inversora, Series A, 6.00%, 3/31/07.......       235
             (e)500    Supercanal Holdings, 11.50%, 5/15/05.............       225
                                                                          --------
                                                                             1,197
                                                                          --------
     SOVEREIGN (17.1%)
              1,460    Republic of Argentina, Global Bond, 11.75%,
                         4/07/09........................................     1,420
              1,900    Republic of Argentina, Global Bond, 12.125%,
                         2/15/19........................................     1,882
              7,492    Republic of Argentina, Global Bond, Series L,
                         (Floating Rate), 5.938%, 3/31/05...............     6,420
                                                                          --------
                                                                             9,722
                                                                          --------
                                                                            10,919
                                                                          --------
  BRAZIL (20.9%)
     SOVEREIGN (20.9%)
              2,100    Federative Republic of Brazil, New Money Bonds,
                         Series L, (Floating Rate), 6.188%, 4/15/09.....     1,336
           (v)4,120    Federative Republic of Brazil, Debt Conversion
                         Bond, Series L, (Floating Rate), 6.188%,
                         4/15/12........................................     2,403
           (v)6,192    Federative Republic of Brazil, Series IE-L,
                         (Floating Rate), 6.125%, 4/15/06...............     4,489
           (v)5,002    Federative Republic of Brazil, C Bond, PIK,
                         5.00%, 4/15/14.................................     3,173
                250    Federative Republic of Brazil, Series L,
                         (Floating Rate), 6.188%, 4/15/09...............       159
             (n)100    Federative Republic of Brazil, Series L,
                         (Floating Rate), 4.50%, 4/15/09................        56
             (n)500    Federative Republic of Brazil, Debt Conversion
                         Bond, Series L, (Floating Rate), 5.00%,
                         4/15/09........................................       277
                                                                          --------
                                                                            11,893
                                                                          --------

<CAPTION>

       FACE
      AMOUNT                                                               VALUE
       (000)                                                               (000)
<C>                    <S>                                                <C>
- ----------------------------------------------------------------------------------

  BULGARIA (5.3%)
     SOVEREIGN (5.3%)
U.S.$         2,870    Republic of Bulgaria, Discount Bond, Series A,
                         (Floating Rate), 5.875%, 7/28/24...............  $  1,952
           (n,v)950    Republic of Bulgaria, Front Loaded Interest
                         Reduction Bond, Series A, 2.50%, 7/28/12.......       544
                820    Republic of Bulgaria, Interest Arrears PDI Bond,
                         (Floating Rate), 5.875%, 7/28/11...............       552
                                                                          --------
                                                                             3,048
                                                                          --------
  COLOMBIA (4.6%)
     CORPORATE (0.3%)
              1,550    Transtel, Discount Note, 0.018%, 8/13/08.........       170
                                                                          --------
     SOVEREIGN (4.3%)
              1,210    Republic of Colombia, (Floating Rate), 10.986%,
                         8/13/05........................................     1,110
              1,290    Republic of Colombia, Global Bond, 10.875%,
                         3/09/04........................................     1,338
                                                                          --------
                                                                             2,448
                                                                          --------
                                                                             2,618
                                                                          --------
  ECUADOR (1.7%)
     SOVEREIGN (1.7%)
              2,030    Republic of Ecuador, Discount Bond, (Floating
                         Rate) 6.00%, 2/28/25...........................       964
                                                                          --------
  INDIA (1.1%)
     CORPORATE (1.1%)
             (e)690    Reliance Industries Ltd., 10.375%, 6/24/16.......       616
                                                                          --------
  JORDAN (0.9%)
     SOVEREIGN (0.9%)
             (v)922    Government of Jordan, Discount Bond, (Floating
                         Rate), 6.00%,12/23/23..........................       516
                                                                          --------
  KOREA (2.7%)
     QUASI-SOVEREIGN (2.7%)
                340    Export-Import Bank of Korea, Global Bond, 6.50%,
                         2/10/02........................................       328
              1,250    Korea Electric Power 7.00%, 10/01/02.............     1,191
                                                                          --------
                                                                             1,519
                                                                          --------
</TABLE>

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Emerging Markets Debt Portfolio

                                      102
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        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING MARKETS DEBT PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
       FACE
      AMOUNT                                                               VALUE
       (000)                                                               (000)
- ----------------------------------------------------------------------------------
<C>                    <S>                                                <C>
  MEXICO (21.1%)
     CORPORATE (0.9%)
U.S.$        (e)150    Innova S De R.L., Senior Notes, 12.875%,
                         4/01/07........................................  $    125
             (e)440    Petroleos Mexicanos, (Floating Rate), 9.875%,
                         7/15/05........................................       411
                                                                          --------
                                                                               536
                                                                          --------
     SOVEREIGN (20.2%)
             (v)200    United Mexican States, Discount Bond, Series A,
                         (Floating Rate), 6.116%, 12/31/19..............       171
           (v)1,150    United Mexican States, Discount Bond, Series B,
                         (Floating Rate), 6.039%, 12/31/19..............       980
                250    United Mexican States, Discount Bonds, Series C,
                         (Floating Rate), 6.201%, 12/31/19..............       213
           (v)2,710    United Mexican States, Discount Bond, Series D,
                         (Floating Rate), 6.098%, 12/31/19..............     2,310
              1,890    United Mexican States, Global Bond, 10.375%,
                         2/17/09........................................     1,959
                740    United Mexican States, Global Bond, 11.375%,
                         9/15/16........................................       801
           (v)1,500    United Mexican States, Par Bond, Series W-A,
                         6.25%, 12/31/19................................     1,178
           (v)4,961    United Mexican States, Par Bond, Series W-B,
                         6.25%, 12/31/19................................     3,897
                                                                          --------
                                                                            11,509
                                                                          --------
                                                                            12,045
                                                                          --------
  MOROCCO (1.0%)
     SOVEREIGN (1.0%)
                670    Government of Morocco, Series A, (Floating Rate),
                         6.063%, 1/01/09................................       546
                                                                          --------
  NIGERIA (1.1%)
     SOVEREIGN (1.1%)
                500    Central Bank of Nigeria, Par Bonds, 6.25%,
                         11/15/20.......................................       314
             (n)710    Nigeria Promissory Note, 5.092%, 1/05/10.........       294
                                                                          --------
                                                                               608
                                                                          --------
  PANAMA (2.5%)
     SOVEREIGN (2.5%)
              1,450    Republic of Panama, Global Bonds, 9.375%,
                         4/01/29........................................     1,450
                                                                          --------

<CAPTION>

       FACE
      AMOUNT                                                               VALUE
       (000)                                                               (000)
<C>                    <S>                                                <C>
- ----------------------------------------------------------------------------------

  PERU (2.3%)
     SOVEREIGN (2.3%)
U.S.$  (e,n,v)1,298    Republic of Peru, Front Loaded Interest Reduction
                         Bond, 3.25%, 3/07/17...........................  $    772
           (n,v)880    Republic of Peru, PDI Bond, 4.00%, 3/07/17.......       562
                                                                          --------
                                                                             1,334
                                                                          --------
  PHILIPPINES (2.6%)
     SOVEREIGN (2.6%)
           (v)1,670    Republic of Phillipines, Front Loaded Interest
                         Reduction Bond, Series B, (Floating Rate),
                         5.962%, 6/01/08................................     1,478
                                                                          --------
  POLAND (1.0%)
     CORPORATE (1.0%)
           (n)1,320    @Entertainment Inc. 0.00%, 2/01/09...............       587
                                                                          --------
  RUSSIA (3.3%)
     SOVEREIGN (3.3%)
           (e)2,130    Russian Federation, 8.75%, 7/24/05...............       538
           (e)3,670    Russian Federation, 11.00%, 7/24/18..............       950
             (v)116    Russian Interest Arrears Note, (Floating Rate),
                         5.969%, 12/15/15...............................         9
         (b,v)5,571    Russian Principal Loans, (Floating Rate), 0.00%,
                         12/15/20.......................................       390
                                                                          --------
                                                                             1,887
                                                                          --------
  TURKEY (2.2%)
     CORPORATE (2.2%)
             (e)820    Cellco Finance NV, 15.00%, 8/01/05...............       799
             (e)539    Pera Financial Services Co., 9.375%, 10/15/02....       459
                                                                          --------
                                                                             1,258
                                                                          --------
  VENEZUELA (2.1%)
     SOVEREIGN (2.1%)
              1,714    Republic of Venezuela Debt Conversion Bond,
                         Series DL, (Floating Rate), 5.938%, 12/18/07...     1,205
                                                                          --------
TOTAL DEBT INSTRUMENTS (Cost $52,435)...................................    54,491
                                                                          --------
</TABLE>

<TABLE>
<CAPTION>
      NO. OF
      RIGHTS
<C>                    <S>                                                <C>
- -------------------

RIGHTS (0.0%)
  MEXICO (0.0%)
              6,246    United Mexican States, Value Recovery Rights,
                         expiring 6/30/03 (Cost $0).....................        --
                                                                          --------
</TABLE>

- --------------------------------------------------------------------------------
                                                 Emerging Markets Debt Portfolio

                                      103
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

EMERGING MARKETS DEBT PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
      NO. OF                                                               VALUE
     WARRANTS                                                              (000)
<C>                    <S>                                                <C>
- ----------------------------------------------------------------------------------

WARRANTS (0.0%)
  ARGENTINA (0.0%)
                  2    Republic of Argentina, expiring 2/25/00..........  $      5
                                                                          --------
</TABLE>

<TABLE>
<CAPTION>
       FACE
      AMOUNT
       (000)
<C>                    <S>                                                <C>
- -------------------

SHORT-TERM INVESTMENT (2.1%)
  REPURCHASE AGREEMENT (2.1%)
$             1,187    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                         4/01/99, to be repurchased at $1,187,
                         collateralized by U.S. Treasury Bonds, 8.875%
                         due 8/15/17, valued at $1,197 (Cost $1,187)....     1,187
                                                                          --------
TOTAL INVESTMENTS 97.7% (Cost $53,622)..................................    55,683
                                                                          --------
</TABLE>

<TABLE>
<S>                                                                       <C>
OTHER ASSETS AND LIABILITIES (2.3%)
  Other Assets..........................................................     5,516
  Liabilities...........................................................    (4,209)
                                                                          --------
                                                                             1,307
                                                                          --------
NET ASSETS (100%).......................................................  $ 56,990
                                                                          --------
                                                                          --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................    $56,041
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 20,522,696 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $2.73
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................       $949
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 344,002 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $2.76
                                                                ---------
                                                                ---------
</TABLE>

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

(e)   --  144A security -- certain conditions for public resale may exist.
(n)   --  Step Bond -- coupon rate increases in increments to maturity. Rate
          disclosed is as of March 31, 1999. Maturity date disclosed is the
          ultimate maturity.
(v)   --  Security is a Brady Bond, created through the debt restructuring
          exchange of commercial bank loans to foreign entities for new fixed
          income obligations. These bonds may be collateralized and are actively
          traded on the over-the-counter secondary market.
ARP   --  Argentina Peso
PDI   --  Past Due Interest
PIK   --  Payment-In-Kind. Income may be paid in additional securities or cash
          at the discretion of the issuer.
Floating Rate -- Interest rate changes on these instruments are based on changes
in a designated base rate. The rates shown are those in effect at March 31,
1999.

- --------------------------------------------------------------------------------
Emerging Markets Debt Portfolio

                                      104
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
FIXED INCOME PORTFOLIO

The Fixed Income Portfolio seeks to produce a high total return consistent with
the preservation of capital by investing primarily in a diversified portfolio of
fixed income securities.

For the three months ended March 31, 1999, the Portfolio had a total return of
- -0.82% for the Class A shares and -0.84% for the Class B shares compared to a
total return of -0.50% for the Lehman Aggregate Bond Index (the "Index"). For
the one-year period ended March 31, 1999, the Portfolio had a total return of
5.42% for the Class A shares and 5.35% for the Class B shares compared to 6.49%
for the Index. For the five-year period ended March 31, 1999, the average annual
total return of Class A shares was 7.82% compared to 7.79% for the Index. From
inception on May 15, 1991 through March 31, 1999, the average annual total
return of Class A shares was 8.06% compared to 8.19% for the Index. From
inception on January 2, 1996 through March 31, 1999, the average annual total
return of Class B shares was 6.37% compared to 6.56% for the Index. As of March
31, 1999, the Portfolio had an SEC 30-day yield of 5.73% for the Class A shares
and 5.58% for the Class B shares.

PERFORMANCE COMPARED TO THE LEHMAN AGGREGATE BOND INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                                       TOTAL RETURNS(2)
                                             ------------------------------------
                                                              AVERAGE    AVERAGE
                                                              ANNUAL     ANNUAL
                                                       ONE     FIVE       SINCE
                                              YTD     YEAR     YEARS    INCEPTION
                                             ------   -----   -------   ---------
<S>                                          <C>      <C>     <C>       <C>
PORTFOLIO -- CLASS A.......................  -0.82%   5.42%    7.82%      8.06%
PORTFOLIO -- CLASS B.......................  -0.84    5.35      N/A       6.37
INDEX -- CLASS A...........................  -0.50    6.49     7.79       8.19
INDEX -- CLASS B...........................  -0.50    6.49      N/A       6.56
</TABLE>

1. The Lehman Aggregate Bond Index is an unmanaged index comprised of the
   Government/Corporate Index, the Mortgage-Backed Securities Index and the
   Asset-Backed Securities Index.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. YIELDS WILL FLUCTUATE AS MARKET CONDITIONS CHANGE.

FIXED INCOME

Evidence of continuing strength of the U.S. economy had an adverse effect on the
domestic bond market during the first quarter. With robust retail sales,
consumption, housing, and consumer confidence data, market participants became
concerned that the Federal Reserve might raise short-term interest rates to
reduce the risk of higher inflation. The result was a sell-off that temporarily
forced most Treasury securities yields to their highest levels since mid-August
of last year.

Despite the surprisingly strong economic data, most measures of inflation have
actually remained well behaved. Our research shows that inflation trends over
the past few years can be explained by three major factors: productivity gains
(favorable), rising labor costs (unfavorable), and lower oil prices (favorable).
As we look ahead, our view is that productivity gains might diminish, labor
costs are likely to stabilize, and oil prices could be flat to higher. Thus, it
appears that these three factors are again likely to create a relatively stable
inflationary environment with the Consumer Price Index staying in the 1.5%-2.0%
area on an annualized basis for at least the rest of this year. Under such
circumstances, it would be difficult for the Federal Reserve to tighten monetary
policy, as evidenced by the recently concluded FOMC meeting where monetary
policy was left unchanged. The Fed is also keenly aware that its actions can
have consequences outside the U.S., most notably on the delicate economic
situation in parts of Asia and Latin America. Accordingly, we expect the central
bank to maintain a steady policy for most of 1999, and that signs of a third
quarter or fourth quarter economic slowdown might allow the Fed to consider
pursuing a more accommodative monetary policy.

Although absolute returns in the fixed income area were generally unfavorable
during the first quarter, corporates and mortgages were once again strong
performers relative to Treasuries, continuing a trend that has been in place
since the end of the "flight-to-quality" Treasury rally early in the fourth
quarter of last year. Yield spreads on these and other non-Treasury securities
tightened, thereby having a favorable effect on relative returns. We remain
overweighted in both corporates and mortgages relative to their benchmark
weights as yield spreads are still above long-term averages, and trends in

- --------------------------------------------------------------------------------
                                                          Fixed Income Portfolio

                                      105
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
FIXED INCOME PORTFOLIO (CONT.)
overall corporate credit quality and mortgage prepayment speeds also remain
favorable. Despite the overweight in these non-Treasury sectors, we have
preserved a very high weighted average credit quality in the Portfolio. The
overall level of prepayment risk associated with our mortgage securities is very
close to that of the broader mortgage index.

We have maintained the interest rate sensitivity of the Portfolio at
approximately a half-year greater than the benchmark during the quarter,
primarily because real interest rates remained at above-average levels at a time
of stable inflation. With the sharp rise in Treasury yields, however, this
decision detracted from relative performance. Longer maturities remain
attractive relative to lower-yielding intermediates, so we continue to have
modest yield-curve strategy involving an underweight in intermediates in favor
of longer maturities. TIPS have held their value quite well during the first
quarter sell-off, and have had a favorable effect on relative performance. It
remains the case that TIPS have "running yields" -- real yields plus the current
annual inflation rate -- above those on nominal Treasuries with similar
maturities. Also helping performance was the hedged DM bond holding as euro-bond
markets held their values better than the U.S. market.

Warren Ackerman, III
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Fixed Income Portfolio

                                      106
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

FIXED INCOME PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
   FACE
  AMOUNT                                                            VALUE
   (000)                                                            (000)
<C>            <S>                                                <C>
- ---------------------------------------------------------------------------

FIXED INCOME SECURITIES (99.5%)
  U.S. GOVERNMENT AND AGENCY OBLIGATIONS (51.9%)
     FEDERAL HOME LOAN MORTGAGE CORPORATION (8.4%)
$         6    13.00%, 9/01/10..................................  $       7
     17,901    6.00%, 12/01/28..................................     17,414
                                                                  ---------
                                                                     17,421
                                                                  ---------
     FEDERAL NATIONAL MORTGAGE ASSOCIATION (23.9%)
      2,909    6.00%, 9/01/10...................................      2,896
      4,175    6.00%, 2/01/11...................................      4,151
      2,279    8.00%, 2/01/12...................................      2,345
      6,633    6.00%, 4/01/13...................................      6,583
      7,500    5.50%, 4/01/14...................................      7,303
     16,802    6.00%, 4/01/28...................................     16,330
     10,088    6.00%, 2/01/29...................................      9,804
                                                                  ---------
                                                                     49,412
                                                                  ---------
     U.S. TREASURY BONDS (7.1%)
     11,000    8.75%, 5/15/20...................................     14,725
                                                                  ---------
     U.S. TREASURY NOTES (12.5%)
      9,000    6.00%, 7/31/02...................................      9,228
      4,000    5.75%, 8/15/03...................................      4,081
      7,000    6.50%, 8/15/05...................................      7,422
      5,174    3.375%, 1/15/07 (Inflation Indexed)..............      4,981
                                                                  ---------
                                                                     25,712
                                                                  ---------
  TOTAL U.S. GOVERNMENT AND AGENCY OBLIGATIONS..................    107,270
                                                                  ---------
  CORPORATE BONDS AND NOTES (30.5%)
     AUTOMOTIVE (1.6%)
      2,000    Ford Motor Co. 6.375%, 2/01/29...................      1,864
      1,500    General Motors 6.75%, 5/01/28....................      1,462
                                                                  ---------
                                                                      3,326
                                                                  ---------
     BANKING (0.7%)
      1,500    Chase Manhattan Corp. 6.00%, 2/15/09.............      1,461
                                                                  ---------
     CHEMICALS (0.9%)
      2,000    Monsanto Co. 6.60%, 12/01/28.....................      1,910
                                                                  ---------
     CONSUMER STAPLES (1.2%)
      2,500    Philip Morris Cos., Inc., (Floating Rate) 6.15%,
                 3/15/00........................................      2,517
                                                                  ---------
     ELECTRONICS (1.5%)
      3,000    Sony Corp. 6.125%, 3/04/03.......................      3,034
                                                                  ---------
     FINANCE (18.7%)
      2,000    American General Institutional Capital, Series A,
                 7.57%, 12/01/45................................      2,082
      2,000    BT Capital Trust, Series B1, D91 7.90%,
                 1/15/27........................................      2,029
      3,000    CNA Financial Corp. 6.50%, 4/15/05...............      2,963
      2,000    Donaldson, Lufkin & Jenrette, Inc. 6.90%,
                 10/01/07.......................................      2,035
      2,500    Farmers Exchange Capital, 7.05%, 7/15/28.........      2,390

<CAPTION>

   FACE
  AMOUNT                                                            VALUE
   (000)                                                            (000)
<C>            <S>                                                <C>
- ---------------------------------------------------------------------------

$     2,000    First Chicago Corp. 7.75%, 12/01/26..............  $   2,053
      2,000    Ford Motor Credit Co. 6.125%, 4/28/03............      2,015
      2,500    General Motors Acceptance Corp. 7.375%,
                 6/22/00........................................      2,558
      1,500    Goldman Sachs Group, Series A 6.34%, 3/01/06.....      1,488
      2,350    Lehman Brothers Holdings, Inc. 6.625%, 4/01/04...      2,350
      1,300    Lehman Brothers Holdings, Inc. 7.375%, 5/15/04...      1,343
      3,000    Liberty Mutal Insurance Co. 8.20%, 5/04/07.......      3,274
      2,000    Lumbermans Mutual Casualty Co., 8.45%,
                 12/01/69.......................................      1,995
      3,000    Merrill Lynch & Co. 6.00%, 2/12/03...............      3,015
      1,000    Progressive Corp. 6.625%, 3/01/29................        958
      2,500    Prudential Insurance Co. 6.375%, 7/23/06.........      2,510
      2,000    Salomon, Inc. 7.30%, 5/15/02.....................      2,080
      1,500    Simon Debartolo Group, MTN, 7.125%, 9/20/07......      1,494
                                                                  ---------
                                                                     38,632
                                                                  ---------
     HEALTH CARE SUPPLIES & SERVICES (0.7%)
      1,500    Columbia/HCA Healthcare, MTN 8.85%, 1/01/07......      1,497
                                                                  ---------
     MULTI-INDUSTRY (0.5%)
      1,000    Lowes Companies Inc. 6.50%, 3/15/29..............        951
                                                                  ---------
     TELECOMMUNICATIONS (1.9%)
      1,000    AT&T Corp. 6.50%, 3/15/29........................        978
      3,000    Worldcom, Inc. 6.40%, 8/15/05....................      3,035
                                                                  ---------
                                                                      4,013
                                                                  ---------
     TRANSPORTATION-ROAD & RAIL (0.7%)
      1,500    Union Pacific Co. 6.625%, 2/01/29................      1,402
                                                                  ---------
     UTILITIES (2.1%)
      2,500    Endesa-Chile (Yankee Bond) 7.75%, 7/15/08........      2,405
      1,889    Oil Enterprises Ltd., 6.239%, 6/30/08............      1,836
                                                                  ---------
                                                                      4,241
                                                                  ---------
  TOTAL CORPORATE BONDS AND NOTES...............................     62,984
                                                                  ---------
  ASSET BACKED SECURITIES (8.7%)
      3,000    Aesop Funding II LLC, Series 97-1, Class A1
                 6.22%, 10/20/01................................      3,018
      3,000    COMED, Series 1998-1, Class A2, SEQ 5.29%,
                 6/25/03........................................      2,986
          1    Federal National Mortgage Association, 5.34%,
                 8/25/06........................................          1
      5,000    Ford Credit Auto Owner Trust, Series 98-B, Class
                 A3, 5.85%, 10/15/01............................      5,023
      2,203    Mid-State Trust, Series IV A 8.33%, 4/01/30......      2,352
      1,250    Peco Energy Transition Trust, 6.05%, 3/01/09.....      1,241
</TABLE>

- --------------------------------------------------------------------------------
                                                          Fixed Income Portfolio

                                      107
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

FIXED INCOME PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
   FACE
  AMOUNT                                                            VALUE
   (000)                                                            (000)
- ---------------------------------------------------------------------------
<C>            <S>                                                <C>
</TABLE>

  ASSET BACKED SECURITIES (CONT.)
<TABLE>
<C>            <S>                                                <C>
$     3,250    Team Fleet Financing Corp., Series 97-1A 7.35%,
                 5/15/03........................................  $   3,353
                                                                  ---------
TOTAL ASSET BACKED SECURITIES...................................     17,974
                                                                  ---------
  COLLATERALIZED MORTGAGE OBLIGATIONS (6.6%)
        650    Chase Commercial Mortgage Securities Corp.,
                 Series 97-2, Class A1, 6.45%, 12/19/04.........        656
      3,024    First Union-Lehman Brothers Commercial Mortgage,
                 6.479%, 3/18/04................................      3,050
      4,016    Lehman Brothers Large Loan, Series 97-LLI A1,
                 6.79%, 6/12/04.................................      4,104
      2,790    Merrill Lynch Mortgage Investors, Inc., 6.22%,
                 2/15/30........................................      2,801
        246    Resolution Trust Corp., Series 91-M5, Class A,
                 9.00%, 3/25/17.................................        246
      2,898    World Financial Credit Services 6.91%, 9/01/13...      2,937
                                                                  ---------
TOTAL COLLATERALIZED MORTGAGE OBLIGATIONS.......................     13,794
                                                                  ---------
  EUROBONDS (1.8%)
     GOVERNMENT BONDS (1.8%)
  EUR 3,600    Deutschland Republic 4.75%, 7/04/28..............      3,760
                                                                  ---------
  TOTAL FIXED INCOME SECURITIES (Cost $207,104).................    205,782
                                                                  ---------
SHORT-TERM INVESTMENTS (2.9%)
  REPURCHASE AGREEMENT (2.9%)
      6,002    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                 4/01/99, to be repurchased at $6,003,
                 collateralized by U.S. Treasury Bonds, 7.125%,
                 due 2/15/23, valued at $6,049 (Cost $6,002)....      6,002
                                                                  ---------
TOTAL INVESTMENTS (102.4%) (Cost $213,106)......................    211,784
                                                                  ---------
</TABLE>

<TABLE>
<CAPTION>
                                                                    VALUE
                                                                    (000)
<S>                                                                <C>
- ---------------------------------------------------------------------------
OTHER ASSETS AND LIABILITIES (-2.4%)
  Other Assets...................................................  $  6,927
  Liabilities....................................................   (11,904)
                                                                   --------
                                                                      4,977
                                                                   --------
NET ASSETS (100%)................................................  $206,807
                                                                   --------
                                                                   --------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................   $203,849
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 18,710,663 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $10.89
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $2,958
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 271,240 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $10.91
                                                                ---------
                                                                ---------
</TABLE>

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

EUR   --  European Monetary Unity
MTN   --  Medium Term Note
Floating Rate Security -- The interest rate changes on these instruments are
based on changes in a designated base rate. The rates shown are those in effect
on March 31, 1999.
Inflation Indexed -- Security includes principal adjustment feature in which par
amount adjusts with the Consumer Price Index to insulate bonds from the effects
of inflation. The face amount shown is that in effect on March 31, 1999.

- --------------------------------------------------------------------------------
Fixed Income Portfolio

                                      108
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
GLOBAL FIXED INCOME PORTFOLIO

The Global Fixed Income Portfolio seeks to produce an attractive real rate of
return while preserving capital by investing primarily in high quality fixed
income securities issued by U.S. and foreign issuers including governments,
agencies, supranational entities, eurobonds and corporations with varying
maturities in various currencies.

PERFORMANCE COMPARED TO THE J.P. MORGAN TRADED GLOBAL BOND INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                                        TOTAL RETURNS(2)
                                             ---------------------------------------
                                                                            AVERAGE
                                                               AVERAGE      ANNUAL
                                                       ONE      ANNUAL       SINCE
                                              YTD     YEAR    FIVE YEARS   INCEPTION
                                             ------   -----   ----------   ---------
<S>                                          <C>      <C>     <C>          <C>
PORTFOLIO -- CLASS A.......................  -3.92%   7.92%     6.44%        7.43%
PORTFOLIO -- CLASS B.......................  -3.93    7.67       N/A         5.04
INDEX -- CLASS A...........................  -3.90    9.73      7.36         8.55
INDEX -- CLASS B...........................  -3.90    9.73       N/A         5.05
</TABLE>

1. The J.P. Morgan Traded Global Bond Index is an unmanaged index of securities
   and includes Australia, Belgium, Canada, Denmark, Finland, France, Germany,
   Ireland, Italy, Japan, The Netherlands, New Zealand, Portugal, South Africa,
   Spain, Sweden, the United Kingdom and the United States.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. PLEASE SEE THE PROSPECTUS FOR A DESCRIPTION OF CERTAIN RISK
CONSIDERATIONS ASSOCIATED WITH INTERNATIONAL INVESTING. YIELDS WILL FLUCTUATE AS
MARKET CONDITIONS CHANGE.

For the three months ended March 31, 1999, the Portfolio had a total return of
- -3.92% for the Class A shares and -3.93% for the Class B shares compared to a
total return of -3.90% for the J.P. Morgan Traded Global Bond Index (the
"Index"). For the one-year period ended March 31, 1999, the Portfolio had a
total return of 7.92% for the Class A shares and 7.67% for the Class B shares
compared to 9.73% for the Index. For the five-year period ended March 31, 1999,
the average annual total return of Class A shares was 6.44% compared to 7.36%
for the Index. From inception on May 1, 1991 through March 31, 1999, the average
annual total return of Class A shares was 7.43% compared to 8.55% for the Index.
From inception on January 2, 1996 through March 31, 1999, the average annual
total return of Class B shares was 5.04% compared to 5.05% for the Index. As of
March 31, 1999, the Portfolio had an SEC 30-day yield of 4.02% for the Class A
shares and 3.87% for the Class B shares.

The first quarter was a disappointing period for global bond markets.

In the U.S., the Treasury market underwent a significant change in sentiment as
the U.S. economy continued to exceed growth expectations and concerns about the
emerging economies diminished. Investor's concluded that the Federal Reserve,
far from cutting interest rates further, could move to reverse some of the
easing initiated last autumn. Therefore, apart from a short rally following the
Brazilian devaluation in mid-January, U.S. yields moved steadily upwards, with
the ten-year bond ending the period approximately 60 basis points higher.

In Europe, domestic factors were more supportive; further weak economic data out
of the industrial sector, particularly Germany, and the surprise resignation of
the German Finance Minister broadened the consensus that the ECB would move to
cut interest rates. As a result, ten-year yields in Europe moved only 10-30
basis points higher with markets showing minimal reaction to both the
resignation of the European Commission and the war in Kosovo.

The Japanese market initially remained concerned about oversupply but rallied
from the sharp sell-off of December/January as the targeting of a zero overnight
call rate by the Bank of Japan signaled a significant shift in monetary policy.
Ten-year yields fell from a high of 2.40% at the beginning of February to end at
1.75%, a fall of approximately 30 basis points during the quarter.

Global portfolio returns in U.S. dollar terms were also hurt by the strength of
the dollar which appreciated 8.3% against the euro and 4.8% against the Japanese
yen over the period.

Changes to our investment strategy were focused on our Japanese position taking
advantage of the high volatility within the market. Following the sharp move up
in yields in late January, we reduced our underweight Japanese bond position by
half, taking interest rate exposure to approximately minus 0.35 years. In terms
of currency, we switched 2% out of the yen, and later back into the yen,
following the

- --------------------------------------------------------------------------------
                                                   Global Fixed Income Portfolio

                                      109
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        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
GLOBAL FIXED INCOME PORTFOLIO (CONT.)

Bank of Japan move. We also sold our position in New Zealand government bonds
following their recent outperformance.

The Portfolio remained overweight interest rate exposure in both the dollar bloc
and European markets and overall duration was unchanged at slightly longer than
the benchmark. Given market movements, country allocation was the main reason
for the Portfolio's underperformance over the quarter as both our underweighting
to the Japanese market and our overweighting to the world ex-Japan proved to be
negative factors.

Looking forward, we believe the fundamental background for bonds remains
supportive. Despite the pick up in activity in some Asian economies, we expect a
period of persistent slow global growth and benign inflation over the coming
year. We see the Japanese economy remaining under pressure, with a corporate
sector still blighted by large excess capacity, falling earnings and a need for
restructuring. The main risk to the Japanese market is the large increase in
supply expected to occur over the next few months. Within Europe, performance is
mixed; while growth is picking up in some countries such as France and the
Netherlands, Germany is still weak. In the U.S., the 'engine of global growth'
over the past year, we expect a moderation in the robust pace of growth. While
the U.S. consumer has proved extremely resilient, we believe that ongoing growth
in consumption is dependent on consumers continuing to enjoy outsized stock
market gains, and as such is unsustainable. With regard to price pressures, we
see the recent rise in energy prices as representing a one-off effect and while
there may be an increase in inflation this year relative to 1998, the underlying
trend will remain that of stable low inflation.

We are concerned about the size of the U.S. current account deficit and this
clearly has negative potential for the dollar. In the near term, however, the
dollar will continue to be supported as long as the U.S. remains the area of
strong growth and higher interest rates within the world. These considerations
lead us to be neutral on the dollar versus the euro, but the need for Japan to
maintain an easy money/weak currency policy to support its economy leads us to
favor the dollar and the euro versus the yen.

J. David Germany
PORTFOLIO MANAGER

Michael B. Kushma
PORTFOLIO MANAGER

Paul F. O'Brien
PORTFOLIO MANAGER

Ram Willner
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Global Fixed Income Portfolio

                                      110
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

GLOBAL FIXED INCOME PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
    FACE
   AMOUNT                                                           VALUE
   (000)                                                            (000)
<C>             <S>                                                <C>
- ---------------------------------------------------------------------------

FIXED INCOME SECURITIES (90.8%)
  AUSTRALIAN DOLLAR (1.9%)
     GOVERNMENT BONDS (1.1%)
  AUD    700    Government of Australia 8.75%, 1/15/01...........  $    473
                                                                   --------
     U.S. GOVERNMENT AND AGENCY OBLIGATIONS-- GLOBAL (0.8%)
  AUD    500    Federal National Mortgage Association--Global
                  6.375%, 8/15/07................................       329
                                                                   --------
                                                                        802
                                                                   --------
  BELGIAN FRANC (0.6%)
     GOVERNMENT BONDS (0.6%)
 BEF     200    Kingdom of Belgium 9.20%, 6/28/10................       249
                                                                   --------
  BRITISH POUND (7.7%)
     GOVERNMENT BONDS (7.7%)
  GBP    125    United Kingdom Treasury Gilt 8.00%, 6/10/03......       227
       1,500    United Kingdom Treasury Gilt 8.50%, 7/16/07......     3,052
                                                                   --------
                                                                      3,279
                                                                   --------
  CANADIAN DOLLAR (2.8%)
     GOVERNMENT BONDS (2.8%)
 CAD   1,500    Government of Canada 8.75%, 12/01/05.............     1,200
                                                                   --------
  DANISH KRONE (1.9%)
     GOVERNMENT BONDS (1.9%)
  DKK  4,800    Kingdom of Denmark 8.00%, 5/15/03................       813
                                                                   --------
  FRENCH FRANC (3.8%)
     GOVERNMENT BONDS (3.8%)
 FRF     350    Government of France 4.50%, 7/12/03..............       397
       1,000    Government of France O.A.T. 6.00%, 10/25/25......     1,234
                                                                   --------
                                                                      1,631
                                                                   --------
  GERMAN MARK (22.1%)
     CORPORATE BONDS (1.1%)
  DEM    400    Kredit Fuer Wiederaufbau 5.00%, 1/04/09..........       460
                                                                   --------
     GOVERNMENT BONDS (21.0%)
  DEM  2,500    Deutschland Republic, Series 91, 8.375%,
                  5/21/01........................................     3,000
       1,150    Government of Germany 6.25%, 1/04/24.............     1,472
         400    Hypothekenbk in Essen 4.00%, 1/19/09.............       419
       1,510    Treuhandanstalt 6.875%, 6/11/03..................     1,857
       1,700    Treuhandanstalt 7.50%, 9/09/04...................     2,192
                                                                   --------
                                                                      8,940
                                                                   --------
                                                                      9,400
                                                                   --------
  GREEK DRACHMA (1.8%)
     GOVERNMENT BONDS (1.8%)
 GRD 220,000    Hellenic Republic 6.60%, 1/15/04.................       751
                                                                   --------

<CAPTION>

    FACE
   AMOUNT                                                           VALUE
   (000)                                                            (000)
<C>             <S>                                                <C>
- ---------------------------------------------------------------------------

  ITALIAN LIRA (3.4%)
     GOVERNMENT BONDS (3.4%)
ITL    1,000    Buoni Poliennali L.C. el Tesoro 9.50%, 2/01/06...  $  1,441
                                                                   --------
  JAPANESE YEN (9.1%)
     GOVERNMENT BONDS (9.1%)
JPY  300,000    Government of Japan, Series 207, 0.90%,
                  12/22/08.......................................     2,326
     150,000    International Bank for Reconstruction &
                  Development 4.75%, 12/20/04....................     1,534
                                                                   --------
                                                                      3,860
                                                                   --------
  NETHERLANDS GUILDER (4.3%)
     GOVERNMENT BONDS (4.3%)
  NLG  1,500    Netherlands Government, Series 1, 8.25%,
                  2/15/02........................................     1,847
                                                                   --------
  SPANISH PESETA (2.4%)
     GOVERNMENT BONDS (2.4%)
 ESP     900    Spanish Government 5.15%, 7/30/09................     1,034
                                                                   --------
  SWEDISH KRONA (1.6%)
     GOVERNMENT BONDS (1.6%)
 SEK   4,900    Swedish Government 6.00%, 2/09/05................       665
                                                                   --------
  UNITED STATES DOLLAR (27.4%)
    ASSET BACKED SECURITIES (2.8%)
U.S.$    130    California Infrastructure (Southern California
                  Edison), Series 97-1, Class A7, 6.42%,
                  12/26/09.......................................       132
         460    Delta Funding Home Equity Loan Trust, Series
                  97-1, 7.21%, 4/25/29...........................       474
         402    Mid-State Trust, Series IV A, 8.33%, 4/01/30.....       427
      (e)200    Monsanto Co. 6.60%, 12/01/28.....................       192
                                                                   --------
                                                                      1,225
                                                                   --------
    COLLATERALIZED MORTGAGE OBLIGATIONS (1.3%)
         528    Asset Securitization Corp., Series 95-MD4 A1,
                  CMO, 7.10%, 8/13/29............................       547
                                                                   --------
    CORPORATE BONDS AND NOTES (6.0%)
         150    AT&T Corp., 6.50%, 3/15/29.......................       147
      (e)250    Farmers Exchange Capital, 7.05%, 7/15/28.........       239
      (e)150    First Chicago Corp., 7.75%, 12/01/26.............       153
      (e)100    Flordia Winstorm, 7.125%, 2/25/19................        99
         250    Ford Motor Co. 6.375%, 2/01/29...................       234
         150    General Motors 6.75%, 5/01/28....................       148
      (e)385    Goldman Sachs Group, 6.25%, 2/01/03..............       387
         300    Lucent Technologies 6.45%, 3/15/29...............       293
         250    Merrill Lynch & Co Inc. 6.875%, 11/15/18.........       248
</TABLE>

- --------------------------------------------------------------------------------
                                                   Global Fixed Income Portfolio

                                      111
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

GLOBAL FIXED INCOME PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
    FACE
   AMOUNT                                                           VALUE
   (000)                                                            (000)
- ---------------------------------------------------------------------------
<C>             <S>                                                <C>
</TABLE>

    CORPORATE BONDS AND NOTES (CONT.)
<TABLE>
<C>             <S>                                                <C>
U.S.$ (e)300    Metropolitan Life Insurance 7.45%, 11/01/23......  $    308
      (e)300    Nationwide Mutual Insurance 7.50%, 2/15/24.......       296
                                                                   --------
                                                                      2,552
                                                                   --------
    EUROBONDS (0.9%)
         400    Deutsche Ausgleichsbank, Series E, MTN 5.125%,
                  9/22/03........................................       390
                                                                   --------
    TAX-EXEMPT INSTRUMENT (0.7%)
         300    Tennessee Valley Authority, Series G, 5.375%,
                  11/13/08.......................................       289
                                                                   --------
    U.S. GOVERNMENT AND AGENCY OBLIGATIONS (15.7%)
     FEDERAL NATIONAL MORTGAGE ASSOCIATION
         750    5.75%, 6/15/05...................................       752
                                                                   --------
     U.S. TREASURY BOND
       2,890    6.25%, 8/15/23...................................     3,026
                                                                   --------
     U.S. TREASURY NOTES
       1,000    6.25%, 10/31/01..................................     1,028
         750    7.25%, 5/15/04...................................       817
         950    7.50%, 2/15/05...................................     1,053
          19    3.625%, 1/15/08 (Inflation Indexed)..............        19
                                                                   --------
                                                                      2,917
                                                                   --------
                                                                      6,695
                                                                   --------
                                                                     11,698
                                                                   --------
TOTAL FIXED INCOME SECURITIES (Cost $38,985).....................    38,670
                                                                   --------
SHORT-TERM INVESTMENTS (7.4%)
  COMMERICAL PAPERS (3.5%)
         800    Abbot Labs, Inc., due 4/19/99, 3.99%.............       799
         700    General Mills, Inc., due 4/9/99, 4.82%...........       699
                                                                   --------
TOTAL COMMERICAL PAPERS..........................................     1,498
                                                                   --------
  REPURCHASE AGREEMENT (3.9%)
       1,660    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                  4/01/99, to be repurchased at $1,660,
                  collateralized by U.S. Treasury Bonds, 7.125%,
                  due 2/15/23, valued at $1,673 (Cost $1,660)....     1,660
                                                                   --------
TOTAL SHORT-TERM INVESTMENTS (Cost $3,158).......................     3,158
                                                                   --------
</TABLE>

<TABLE>
<CAPTION>
                                                                    VALUE
                                                                    (000)
<S>                                                               <C>
- ---------------------------------------------------------------------------

TOTAL INVESTMENTS (98.2%) (Cost $42,143)........................  $ 41,828
                                                                  ---------
OTHER ASSETS AND LIABILITIES (1.8%)
  Other Assets..................................................     4,530
  Liabilities...................................................    (3,758)
                                                                  ---------
                                                                       772
                                                                  ---------
NET ASSETS (100%)...............................................  $ 42,600
                                                                  ---------
                                                                  ---------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................    $42,254
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 3,515,297 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $12.02
                                                                ---------
                                                                ---------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................       $346
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 28,899 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................     $11.98
                                                                ---------
                                                                ---------
</TABLE>

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

(e)   --  144A Security -- certain conditions for public sale may exist.
CMO   --  Collateralized Mortgage Obligation
MTN   --  Medium Term Notes
Inflation Indexed Security -- Security includes principal adjustment feature in
which par amount adusts with the Consumer Price Index to insulate bonds from the
effects of inflation. The face amount shown is that in effect on March 31, 1999.

- --------------------------------------------------------------------------------
Global Fixed Income Portfolio

                                      112
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
HIGH YIELD PORTFOLIO

The High Yield Portfolio seeks to maximize total return by investing primarily
in a diversified portfolio of high yield fixed income securities that offer a
yield above that generally available on debt securities in the four highest
rating categories of the recognized rating services.

For the three months ended March 31, 1999, the Portfolio had a total return of
2.92% for the Class A shares and 2.79% for the Class B shares compared to a
total return of 1.64% for the CS First Boston High Yield Index (the "Index").
For the one-year period ended March 31, 1999, the Portfolio had a total return
of 1.73% for the Class A shares and 1.48% for the Class B shares compared to
- -0.75% for the Index. For the five-year period ended December 31, 1999, the
average annual total return of Class A shares was 10.96% compared to 8.74% for
the Index. From inception on September 28, 1992 through March 31, 1999, the
average annual total return of Class A shares was 11.75% compared to 9.62% for
the Index. From inception on January 2, 1996 through March 31, 1999, the average
annual total return of Class B shares was 10.82% compared to 8.24% for the
Index. As of March 31, 1999, the Portfolio had an SEC 30-day yield of 9.84% for
the Class A shares and 9.59% for the Class B shares.

PERFORMANCE COMPARED TO THE CS FIRST BOSTON HIGH YIELD INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                           TOTAL RETURNS(2)
                       ---------------------------------------------------------
                                                  AVERAGE
                                      ONE         ANNUAL        AVERAGE ANNUAL
                          YTD         YEAR      FIVE YEARS     SINCE INCEPTION
                       ----------  ----------  -------------  ------------------
<S>                    <C>         <C>         <C>            <C>
PORTFOLIO -- CLASS
 A...................       2.92%       1.73%       10.96%            11.75%
PORTFOLIO -- CLASS
 B...................       2.79        1.48        N/A               10.82
INDEX -- CLASS A.....       1.64       -0.75         8.74              9.62
INDEX -- CLASS B.....       1.64       -0.75        N/A                8.24
</TABLE>

1. The CS First Boston High Yield Index is an unmanaged index of high yield
   corporate bonds.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. INVESTING IN HIGH YIELD FIXED INCOME
SECURITIES, OTHERWISE KNOWN AS "JUNK BONDS" IS SPECULATIVE AND INCLUDES GREATER
RISK OF LOSS OF PRINCIPAL AND INTEREST. THE PERFORMANCE RESULTS PROVIDED ARE FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF THE
PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. YIELDS WILL FLUCTUATE AS MARKET CONDITIONS CHANGE.

The high yield market outperformed high quality bonds in the first quarter as
investors continued to be more willing to bear risk. Despite volatility and a
sell off in the Treasury market, robust mergers and acquisitions activity,
evidence of a stronger than expected U.S. economy, and solid inflows into high
yield mutual funds contributed to the strength in the sector. In addition, a
strong equity market, rising energy prices and relative stability in the
emerging markets also helped the performance of high yield bonds.

The positive results versus the Index were primarily a result of a large
overweight in the telecommunications sector, which continued to demonstrate
strong performance. Results also benefited from security selection across
sectors, exposure to non-US issues, and from an underweight in the energy
sector, which performed poorly. Exposure to the healthcare sector, which is
under pressures and an underweight in cyclical issues, which started to rebound
in the quarter, detracted from relative performance.

Consolidation, equity investments by higher quality companies and initial public
offerings demonstrate the inherent asset values in many of the companies in the
telecommunications and cable sectors. Nextel Communications, a leading player in
the domestic wireless business and one of our largest holdings, performed well
on speculation regarding a possible combination with a higher quality company.
Similarly, the Portfolio benefited as long distance providers Qwest, Level
Three, Dolphin Telecom and Global Crossing have either entered into a strategic
combination or partnership or have raised additional capital in a very favorable
market environment. Internet data and access providers such as PSINet, Rhythms
Net and Concentric held in the Portfolio also performed well. In contrast, small
exposure to satellite communications companies including Iridium and American
Mobile Satellite detracted slightly from returns as these companies performed
poorly due to disappointing launch experience and slow customer uptake of
service.

Equity investments and actual or proposed M&A activity propelled the cable and
media sectors as well. For example, the Portfolio benefited from Microsoft's
$500 million investment in NTL, a U.K. cable company. Cable holdings in general
benefited from Comcast's merger with Media One and from Microsoft co-founder
Paul Allen's multi-billion dollar investments in cable systems throughout the
world.

- --------------------------------------------------------------------------------
                                                            High Yield Portfolio

                                      113
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[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
HIGH YIELD PORTFOLIO (CONT.)
Regarding positive developments in other holdings, Adelphia Communications in
the cable sector was buoyed by a ratings upgrade and Chancellor Media rallied
when it announced it was exploring alternatives to enhance shareholder value.
The positive developments in the cable sector are starting to price many of the
cable issues out of the high yield market.

After concern early in the quarter over the much anticipated devaluation of the
Brazilian currency, emerging market issues benefited from the upgrade of Korean
sovereign debt to investment grade and from reduced fear of contagion from
Brazil. The gaming industry has also demonstrated a sound earnings trend and the
securities in that sector have generally performed well.

Cyclical issues rebounded somewhat in the period. While the Portfolio has
benefited as certain individual cyclical credits have done well, being
underweighted in these issues was a negative for returns. Pricing has been
somewhat better in many product lines, but security prices may be a bit ahead of
the fundamentals in some cases. For example, capacity utilization in steel is
still at unacceptable levels and the likelihood of strong profitability is
questionable for many companies. However, the level of imports is declining and
some price increases are taking hold. We have been underweighted in these
issues, which has been a large positive for returns over recent years, but have
been gradually reducing this bet by adding names such as Pacifica Papers,
National Steel and DR Horton.

The weakest sectors have been healthcare and energy as weak industry pricing has
put serious pressure on the most leveraged competitors. The price of Vencor, a
holding in the long term care segment, has fallen dramatically due to difficulty
adjusting to a new regulatory pricing scheme. In addition, Columbia HCA, an
important holding that we believe is a sound credit, sold off when it lost its
investment grade rating by S&P. Until recently, weak oil prices depressed the
energy sector. OPEC pledged to reduce production and several major oil companies
have announced mergers with the likely result that combined drilling plans will
be reduced significantly. This should be beneficial for the exploration and
production companies that survive, but spells continued problems for drilling
companies and other service companies.

Even with the rebound in the high yield market relative to high quality bonds,
we continue to believe that the sector offers attractive relative value. Spread
levels versus high quality bonds are still at levels that are wider than long
term averages at a time when the economy and credit quality of most issuers is
strong. High yield bonds also appear compelling versus equities on a risk
adjusted expected return basis.

Robert Angevine
PORTFOLIO MANAGER

Thomas L. Bennett
PORTFOLIO MANAGER

Stephen F. Esser
PORTFOLIO MANAGER

Gordon W. Loery
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
High Yield Portfolio

                                      114
<PAGE>
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        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

HIGH YIELD PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
   FACE
  AMOUNT                                                            VALUE
   (000)                                                            (000)
<C>            <S>                                                <C>
- ---------------------------------------------------------------------------

CORPORATE BONDS AND NOTES (94.2%)
  ASSET BACKED CORPORATES (0.4%)
$       815    Long Beach Auto, Series 97-1, Class B, 14.22%,
                 10/26/03.......................................  $     808
                                                                  ---------
  CABLE (2.1%)
      1,100    Lenfest Communications, Inc., 8.375%, 11/01/05...      1,179
      1,000    Rogers Cablesystems Ltd., Series B, 10.00%,
                 3/15/05........................................      1,127
        185    Rogers Cablesystems of America, 10.125%,
                 9/01/12........................................        207
      1,325    Rogers Communications, Inc., 9.125%, 1/15/06.....      1,391
                                                                  ---------
                                                                      3,904
                                                                  ---------
  CHEMICALS (1.1%)
      2,000    ISP Holdings, Inc., Series B, 9.00%, 10/15/03....      2,058
                                                                  ---------
  COMMERCIAL MORTGAGES (0.4%)
        875    FMAC Loan Receivables Trust, Series 96-B, Class
                 C, (Floating Rate), 7.929%, 11/01/18...........        665
                                                                  ---------
  COMMUNICATIONS (7.5%)
      1,040    Globalstar Capital Corp., 11.375%, 2/15/04.......        681
        310    Globalstar LP, 11.50%, 6/01/05...................        197
      1,010    Hyperion Telecommunication, 0.00%, 4/15/03.......        836
   (n)3,130    Intermedia Communications, Inc., Series B, 0.00%,
                 7/15/07........................................      2,387
        800    Intermedia Communications, Inc., Series B, 8.50%,
                 1/15/08........................................        798
      1,620    Iridium LLC/Capital Corp., Series A, 13.00%,
                 7/15/05........................................        697
      1,020    Metromedia Fiber Network, 10.00%, 11/15/08.......      1,094
   (n)4,095    Nextel Communications, Inc., 0.00%, 9/15/07......      3,000
      1,290    Onepoint Communications Corp., 14.50%, 6/01/08...        658
     (n)770    RCN Corp., 0.00%, 10/15/07.......................        520
      1,620    Rogers Cantel, Inc., 8.30%, 10/01/07.............      1,693
      (n)51    RSL Communications, plc, 12.25%, 11/15/06........         56
   (n)1,440    Viatel, Inc., 0.00%, 4/15/08.....................        882
        570    Vintage Petroleum, 9.75%, 6/30/09................        581
                                                                  ---------
                                                                     14,080
                                                                  ---------
  CORPORATE BONDS (0.7%)
      1,300    Mosaic Re, Class A, 10.10%, 7/09/99..............      1,309
                                                                  ---------
  ENERGY (1.1%)
      2,040    Snyder Oil Corp., 8.75%, 6/15/07.................      2,045
                                                                  ---------
  FINANCIAL (0.6%)
   (n)1,110    SB Treasury Co. LLC, 9.40%, 12/29/49.............      1,088
                                                                  ---------
  FOOD AND BEVERAGE (0.7%)
      1,425    Smithfield Foods, Inc., 7.625%, 2/15/08..........      1,375
                                                                  ---------

<CAPTION>

   FACE
  AMOUNT                                                            VALUE
   (000)                                                            (000)
<C>            <S>                                                <C>
- ---------------------------------------------------------------------------

  GAMING (1.8%)
$     2,663    Station Casinos, Inc., 10.125%, 3/15/06..........  $   2,826
        470    Station Casinos, Inc., 9.75%, 4/15/07............        497
                                                                  ---------
                                                                      3,323
                                                                  ---------
  GENERAL INDUSTRIAL (17.4%)
        400    Adelphia Communications, Inc., 8.375%, 2/01/08...        411
        275    Adelphia Communications, Series B, 9.875%,
                 3/01/07........................................        303
      1,025    Adelphia Communications, Series B, 8.375%,
                 2/01/08........................................      1,053
        485    Allied Waste North America, 7.875%, 1/01/09......        474
      1,390    American Standard, Cos., Inc., 7.375%, 2/01/08...      1,358
        585    Applied Power Inc., 8.75%, 4/01/09...............        591
        950    Axia, Inc., 10.75%, 7/15/08......................        958
      2,150    Cex Holdings Inc., 9.625%, 6/01/08...............      2,021
      1,380    Chancellor Media, 9.00%, 10/01/08................      1,478
      3,758    Columbia Healthcare Corp., 7.69%, 6/15/25........      3,160
      1,450    Columbia/HCA Heathcare Corp., 7.00%, 7/01/07.....      1,304
        600    Columbia/HCA Healthcare Corp., 7.58%, 9/15/25....        503
      1,855    D R Horton Inc., 8.00%, 2/01/09..................      1,827
      2,010    Echostar DBS Corp., 9.375%, 2/01/09..............      2,085
        320    Entex Telecom Group plc, 12.50%, 8/01/06.........        230
      1,880    Harrahs Operating Co., Inc., 7.875%, 12/15/05....      1,894
      1,675    Hayes Lemmerz International, Inc., 8.25%,
                 12/15/08.......................................      1,679
      1,820    Hilton Hotels Corp., 7.95%, 4/15/07..............      1,865
        700    Host Marriott LP, 8.375%, 2/15/06................        702
        910    Lenfest Communications, Inc., 7.625%, 2/15/08....        939
   (n)1,620    Norcal Waste Systems, Inc., Series B, 13.50%,
                 11/15/05.......................................      1,798
      1,405    National Steel Corp., 9.875%, 3/01/09............      1,444
   (n)3,050    NTL, Inc., 0.00%, 4/01/08........................      2,074
      1,425    Park Place Entertainment, 7.875%, 12/15/05.......      1,402
        950    R&B Falcon Corp., 9.50%, 12/15/08................        841
                                                                  ---------
                                                                     32,394
                                                                  ---------
  HEALTH CARE (3.1%)
      1,730    Fresenius Medical Capital Trust II, 7.875%,
                 2/01/08........................................      1,708
      1,975    Tenet Healthcare Corp., 8.625%, 1/15/07..........      1,958
      1,750    Tenet Healthcare Corp., 8.125%, 12/01/08.........      1,700
      3,150    Vencor, Inc., 9.875%, 5/01/05....................        472
                                                                  ---------
                                                                      5,838
                                                                  ---------
  MEDIA AND ENTERTAINMENT (3.3%)
        215    CB Richard Ellis Service Group, Inc., 8.875%,
                 6/01/06........................................        215
      1,770    Chancellor Media Corp., Series B, 8.125%,
                 12/15/07.......................................      1,797
</TABLE>

- --------------------------------------------------------------------------------
                                                            High Yield Portfolio

                                      115
<PAGE>
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        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

HIGH YIELD PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
   FACE
  AMOUNT                                                            VALUE
   (000)                                                            (000)
- ---------------------------------------------------------------------------
<C>            <S>                                                <C>
</TABLE>

  MEDIA AND ENTERTAINMENT (CONT.)
<TABLE>
<C>            <S>                                                <C>
$     2,650    HMH Properties, Inc., Series A, 7.875%,
                 8/01/05........................................  $   2,587
      1,400    Outdoor Systems, Inc., 8.875%, 6/15/07...........      1,498
                                                                  ---------
                                                                      6,097
                                                                  ---------
  METALS (0.7%)
      1,380    Murrin Murrin Holdings, PTY, (Yankee Bond),
                 9.375%, 8/31/07................................      1,242
                                                                  ---------
  PACKAGING (4.5%)
        895    Columbia/HCA Healthcare Corp., 8.13%, 8/04/03....        883
      1,570    Columbia/HCA Healthcare Corp., 7.25%, 5/20/08....      1,425
        500    Musicland Group, Inc., 9.00%, 6/15/03............        505
      2,245    Musicland Group, Inc., 9.875%, 3/15/08...........      2,295
      1,970    Nortek, Inc., 8.875%, 8/01/08....................      2,024
      1,145    SD Warren Co., 12.00%, 12/15/04..................      1,239
                                                                  ---------
                                                                      8,371
                                                                  ---------
  RETAIL (4.3%)
      1,645    CA FM Lease Trust, 8.50%, 7/15/17................      1,771
        604    DR Securitized Lease Trust, Series 93-K1, Class
                 A1, 6.66%, 8/15/10.............................        575
      2,172    DR Securitized Lease Trust, Series 94-K1, Class
                 A1, 7.60%, 8/15/07.............................      2,171
      1,175    DR Securitized Lease Trust, Series 94-K1, Class
                 A2, 8.375%, 8/15/15............................      1,201
      2,210    Kmart Corp., 8.80%, 7/01/10......................      2,307
                                                                  ---------
                                                                      8,025
                                                                  ---------
  SOVEREIGN AND EMERGING MARKETS (26.4%)
        970    Asia Pulp & Paper Co., Ltd., 12.00%, 2/15/04.....        466
      1,350    AST Research, Inc., 7.45%, 10/01/02..............      1,271
   (n)1,195    Cia Energitica de Sao Paulo, 9.125%, 6/26/07.....        956
   (n)1,830    CTI Holdings, 0.00%, 4/15/08.....................      1,016
   (n)2,425    Dolphin Telecom plc, 0.00%, 6/01/08..............      1,237
        600    Esprit Telecom Group plc, 11.50%, 12/15/07.......        639
        965    Esprit Telecom Group plc, 10.875%, 6/15/08.......      1,014
      1,520    Fuji JGB Investments, LLC, 9.87%, 12/31/49.......      1,353
      1,530    Glencore Nickel Property Ltd., 9.00%, 12/01/14...      1,310
        815    Grupo Minero Mexico, 8.25%, 4/01/08..............        680
      1,760    Hermes Europe Railtel BV, 11.50%, 8/15/07........      1,927
      1,925    HMV Media Group plc, Series A, 10.25%, 5/15/08...      1,988
      1,270    Husky Oil Ltd., 8.90%, 8/15/28...................      1,206
        975    Hyundai Semiconductor, 8.625%, 5/15/07...........        782
      2,025    Indah Kiat Financial Mauritius, 10.00%,
                 7/01/07........................................      1,134
        972    Korea Development Bank, 6.625%, 11/21/03.........        925
      1,640    Multicanal, 10.50%, 2/01/07......................      1,468
        830    Multicanal, 10.50%, 4/15/18......................        691
      2,345    Norampac, Inc., 9.50%, 2/01/08...................      2,439
<CAPTION>

   FACE
  AMOUNT                                                            VALUE
   (000)                                                            (000)
<C>            <S>                                                <C>
- ---------------------------------------------------------------------------

$     1,010    NSM Steel, Inc., 12.25%, 2/01/08.................  $      61
   (n)2,275    Occidente y Caribe Cellular, 0.00%, 3/15/04......      1,649
      1,545    Pacific Papers Corp., 10.00%, 3/15/09............      1,589
      2,470    Philippine Long Distance Telephone, Global Bond,
                 9.25%, 6/30/06.................................      2,346
      2,445    Pindo Deli Finincial Mauritius, 10.75%,
                 10/01/07.......................................      1,369
   (n)2,690    PTC International Finance BV, 0.00%, 7/01/07.....      1,957
      1,380    Quezon Power Ltd., 8.86%, 6/15/17................      1,049
      1,185    Ras Laffan Gas Liquified Natural Gas, 8.294%,
                 3/15/14........................................      1,115
      1,470    RBS Participacoes, 11.00%, 4/01/07...............        779
      5,048    Republic of Argentina, (Floating Rate) (Bearer),
                 5.938%, 3/31/05................................      4,326
   (n)1,440    RSL Communications, plc, 0.00%, 3/01/08..........        950
   (n)2,975    RSL Communications, plc, 9.125%, 3/01/08.........      2,945
      1,410    Samsung Electronics America, 9.75%, 5/01/03......      1,443
      2,480    Satelites Mexicanos, 10.125%, 11/01/04...........      1,984
      3,600    TV Azteca, Series B, 10.50%, 2/15/07.............      2,988
        373    RG Receivables Ltd., 9.60%, 2/10/05..............        224
                                                                  ---------
                                                                     49,276
                                                                  ---------
  TECHNOLOGY (10.2%)
      1,765    American Cellular Corp., 10.50%, 5/15/08.........      1,840
      1,845    AMSC Acquisition Co., Inc., 12.25%, 4/01/08......        927
      3,400    CSC Holdings, Inc., 9.875%, 5/15/06..............      3,736
      1,255    Dobson Communications Corp., 11.75%, 4/15/07.....      1,349
   (n)1,860    Nextel Communications, Inc., 9.75%, 8/15/04......      1,934
   (n)1,335    Nextel Communications, Inc., 0.00%, 2/15/08......        934
      3,785    NEXTLINK Communications, Inc., 0.00%, 4/15/08....      2,422
      1,315    Primus Telecommunications Group, Inc., 9.875%,
                 5/15/08........................................      1,269
        640    Primus Telecommunications Group, Inc., 11.25%,
                 1/15/09........................................        661
      1,120    Psinet Inc., 10.00%, 2/15/05.....................      1,196
      1,565    Qwest Communications International, Inc., 0.00%,
                 10/15/07.......................................      1,240
      2,265    RCN Corp., 0.00%, 2/15/08........................      1,416
                                                                  ---------
                                                                     18,924
                                                                  ---------
  TELEPHONE (3.0%)
        900    Centennial Cellular, 10.75%, 12/15/08............        963
      1,725    Global Crossing Holdings, 9.625%, 5/15/08........      1,922
   (n)3,450    Rhythms Netconnections, 0.00%, 5/15/08...........      1,932
   (n)1,290    Wam!Net, Inc., 13.25%, 3/1/05....................        748
                                                                  ---------
                                                                      5,565
                                                                  ---------
  TRANSPORTATION (3.1%)
      1,751    Aircraft Lease Portfolio Securitization Ltd.,
                 Series 96-1 P1, Class D, 12.75%, 6/15/06.......      1,751
      1,950    American Commercial Lines LLC, 10.25%, 6/30/08...      2,008
</TABLE>

- --------------------------------------------------------------------------------
High Yield Portfolio

                                      116
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

HIGH YIELD PORTFOLIO (CONT.)
- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
   FACE
  AMOUNT                                                            VALUE
   (000)                                                            (000)
- ---------------------------------------------------------------------------
<C>            <S>                                                <C>
</TABLE>

  TRANSPORTATION (CONT.)
<TABLE>
<C>            <S>                                                <C>
$     1,050    Jet Equipment Trust, Series C-1, 11.79%,
                 6/15/13........................................  $   1,335
        525    Jet Equipment Trust, Series 95-D, 11.44%,
                 11/01/14.......................................        661
                                                                  ---------
                                                                      5,755
                                                                  ---------
  UTILITIES (1.8%)
      1,780    AES Corp., 8.50%, 11/01/07.......................      1,756
      1,605    CMS Eergy, 7.50%, 1/15/09........................      1,634
                                                                  ---------
                                                                      3,390
                                                                  ---------
TOTAL CORPORATE BONDS AND NOTES (Cost $185,699).................    175,532
                                                                  ---------
</TABLE>

<TABLE>
<CAPTION>
  SHARES
<C>            <S>                                                <C>
- -----------

COMMON STOCKS (0.0%)
  HOTEL/LODGING/RESTAURANTS (0.0%)
      1,300    Motels of America, Inc. (Cost $84)...............         14
                                                                  ---------
PREFERRED STOCKS (1.9%)
  COMMUNICATIONS (0.9%)
      5,644    Viatel, Inc., Class A, 10.00%, 4/15/10...........         93
      1,387    IXC Communications, Inc., Series B, PIK, 12.50%,
                 8/15/09........................................      1,498
                                                                  ---------
                                                                      1,591
                                                                  ---------
  PACKAGING (0.6%)
     10,056    Paxson Communications Corp., PIK, 13.25%,
                 11/15/06.......................................        837
      3,373    Paxson Communications Corp., PIK, 9.75%,
                 12/31/06.......................................        314
                                                                  ---------
                                                                      1,151
                                                                  ---------
  TECHNOLOGY (0.4%)
      7,430    Concentric Network Corp..........................        802
                                                                  ---------
TOTAL PREFERRED STOCKS (Cost $3,147)............................      3,544
                                                                  ---------
</TABLE>
<TABLE>
<CAPTION>
  NO. OF
 WARRANTS
<C>            <S>                                                <C>
- -----------

WARRANTS (0.5%)
  COMMUNICATIONS (0.4%)
        600    Globalstar Telecommunications Ltd., expiring
                 2/15/04........................................         29
        605    Iridium World Communications, Inc., expiring
                 7/15/05........................................         35
     12,900    Onepoint Communications Corp., expiring 6/1/08...          1
    138,000    Rhythms Net Connections..........................        552
                                                                  ---------
                                                                        617
                                                                  ---------
  PACKAGING (0.0%)
      1,024    Paxson Communications Corp., expiring 6/30/03....         --
                                                                  ---------
  SOVEREIGN AND EMERGING MARKETS (0.1%)
  6,394,240    NSM Steel Ltd., Inc., expiring 2/01/08...........          7
      9,100    Occidente y Caribe Cellular, expiring 3/15/04....        159
                                                                  ---------
                                                                        166
                                                                  ---------

<CAPTION>

  NO. OF                                                            VALUE
 WARRANTS                                                           (000)
<C>            <S>                                                <C>
- ---------------------------------------------------------------------------

  TECHNOLOGY (0.0%)
     18,450    American Mobile Satellite Corp., expiring
                 4/01/08........................................  $       6
      2,800    Nextel Communications, Inc., expiring 4/25/99....         --
     38,700    Wam!Net, Inc., expiring 3/01/05..................         77
                                                                  ---------
                                                                         83
                                                                  ---------
TOTAL WARRANTS (Cost $0)........................................        866
                                                                  ---------
</TABLE>

<TABLE>
<CAPTION>
   FACE
  AMOUNT
   (000)
<C>            <S>                                                <C>
- -----------

SHORT-TERM INVESTMENTS (0.6%)
  REPURCHASE AGREEMENT (0.6%)
$     1,216    Chase Securities, Inc. 4.65%, dated 3/31/99, due
                 4/01/99, to be repurchased at $1,216,
                 collateralized by U.S. Treasury Bonds, 7.125%,
                 due 2/15/23, valued at $1,255..................      1,216
                                                                  ---------
  PROMISARY NOTES (0.0%)
          1    Capital Gaming International, Inc. (Cost $0).....         --
                                                                  ---------
TOTAL SHORT-TERM INVESTMENTS (Cost $1,216)......................      1,216
                                                                  ---------
TOTAL INVESTMENTS (97.2%) (Cost $190,146).......................    181,172
                                                                  ---------
</TABLE>

<TABLE>
<S>                                                                  <C>
OTHER ASSETS AND LIABILITIES (2.8%)
  Other Assets.....................................................  14,831
  Liabilities......................................................  (9,666)
                                                                     -------
                                                                      5,165
                                                                     -------
NET ASSETS (100%)..................................................  $186,337
                                                                     -------
                                                                     -------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................    $146,249
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 13,422,771 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $10.90
                                                                ----------
                                                                ----------
CLASS B:
- --------------------------------------------------------------
NET ASSETS....................................................     $40,088
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 3,688,279 outstanding $0.001 par
  value shares (authorized 500,000,000 shares)................      $10.87
                                                                ----------
                                                                ----------
</TABLE>

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

(e)   --  144A Security -- certain conditions for public sale may exist.
(n)   --  Step Bond -- coupon rate increases in increments to maturity. Rate
          disclosed is as of March 31, 1999. Maturity date disclosed is the
          ultimate maturity date.
PIK   --  Payment-in-Kind. Income may be recieved in additional securities or
          cash at the discretion of the issuer.
Floating Rate Security -- The interest rate changes on these instruments are
based on changes in a designated base rate. The rates shown are those in effect
on March 31, 1999.

- --------------------------------------------------------------------------------
                                                            High Yield Portfolio

                                      117
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------

LETTER TO SHAREHOLDERS
- --------------------------------------------------------------------------------
MUNICIPAL BOND PORTFOLIO

The Municipal Bond Portfolio seeks high current income consistent with
preservation of principal through investment in a portfolio consisting primarily
of intermediate and long-term investment grade municipal obligations, the
interest on which is exempt from Federal income tax.

For the three months ended March 31, 1999, the Portfolio had a total return of
0.29% for the Class A shares compared to a total return of 0.85% for the Lehman
7-Year Municipal Bond Index (the "Index"). For the one-year period ended March
31, 1999, the Portfolio had a total return for the Class A shares of 4.87%
compared to 5.92% for the Index. From inception on January 18, 1995 through
March 31, 1999, the average annual total return of the Portfolio Class A shares
was 6.06% compared to 7.39% for the Index. As of March 31, 1999 the Portfolio
had an SEC 30-day yield of 4.10% for the Class A shares.

During the first quarter of 1999, municipal bonds were strong performers
relative to U.S. Treasuries. This continued a trend that has been in place since
the end of the "flight-to-quality" Treasury rally early in the fourth quarter of
last year. Yield spreads on municipals as compared to Treasuries moved closer to
historical averages, thereby having a favorable effect on relative returns. The
5-year municipal versus Treasury ratio went from 82.6% to 75% and the 30-year
ratio went from 97% to 89.6%.

PERFORMANCE COMPARED TO THE LEHMAN
7-YEAR MUNICIPAL BOND INDEX(1)
- -----------------------------------------

<TABLE>
<CAPTION>
                                          TOTAL RETURNS(2)
                             -------------------------------------------
                                            ONE        AVERAGE ANNUAL
                                YTD         YEAR       SINCE INCEPTION
                             ----------  ----------  -------------------
<S>                          <C>         <C>         <C>
PORTFOLIO..................       0.29%       4.87%           6.06%
INDEX......................       0.85        5.92            7.39
</TABLE>

1. The Lehman 7-Year Municipal Bond Index consists of investment grade bonds
   with maturities between 6-8 years, rated BAA or better. All bonds have been
   taken from issues of at least $50 million in size sold within the last five
   years.

2. Total returns for the Portfolio reflect expenses waived and reimbursed, if
   applicable, by the Adviser. Without such waiver and reimbursement, total
   returns would be lower.

PAST PERFORMANCE IS NOT PREDICTIVE OF FUTURE PERFORMANCE.

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

THE INFORMATION CONTAINED IN THIS OVERVIEW REGARDING SPECIFIC SECURITIES IS FOR
INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A RECOMMENDATION TO
PURCHASE OR SELL THE SECURITIES MENTIONED. THE PERFORMANCE RESULTS PROVIDED ARE
FOR INFORMATIONAL PURPOSES ONLY AND SHOULD NOT BE CONSTRUED AS A GUARANTEE OF
THE PORTFOLIO'S FUTURE PERFORMANCE. PAST PERFORMANCE SHOWN IS NOT PREDICTIVE OF
FUTURE PERFORMANCE. INVESTMENT RETURN AND PRINCIPAL VALUE WILL FLUCTUATE SO THAT
AN INVESTOR'S SHARES, WHEN REDEEMED, MAY BE WORTH MORE OR LESS THAN THEIR
ORIGINAL COST. YIELDS WILL FLUCTUATE AS MARKET CONDITIONS CHANGE.

The U.S. Treasury market suffered as economic reports pointing to resilience in
the U.S. economy dashed expectations for an additional Federal Reserve rate cut.
With robust retail sales, consumption, housing and consumer confidence data,
market participants became concerned that the Federal Reserve might raise
short-term interest rates to reduce the risk of higher inflation. The result was
a sell-off that temporarily forced yields on Treasury securities to their
highest levels since mid-August of last year. With the current relatively stable
inflationary environment, it would be difficult for the Federal Reserve to
tighten monetary policy, as evidenced by the recently concluded FOMC meetings
where monetary policy was left unchanged. The Fed is also keenly aware that its
actions can have consequences outside the U.S., most notably on the delicate
economic situation in parts of Asia and Latin America. Accordingly, we expect
the Fed to maintain a steady policy for most of 1999.

The municipal market remained calm given the storm in the Treasury market during
the first quarter. With Treasury yields backing up, municipal yields barely
budged during the quarter. Municipal new issuance volume was 19% lower in the
first quarter of 1999 versus the first quarter of 1998. This decline in volume
was due to a drop in refunding volume. With municipal vs. Treasury ratios coming
back in line with their historical averages, crossover buyers and total return
accounts were finally rewarded. Fundamentals for the municipal market look good
going forward. Low supply, manageable dealer inventories and low volatility
should overcome apathy from investors even given that nominal yields are near
their historical lows.

The Portfolio's average maturity during the quarter was maintained at
approximately 8 years, with a slightly barbelled structure. In the current
interest rate environment we continue to look for opportunities to purchase
bonds that provide a high level of current income.

Lori A. Cohane
PORTFOLIO MANAGER

April 1999

- --------------------------------------------------------------------------------
Municipal Bond Portfolio

                                      118
<PAGE>
[LOGO]  Morgan Stanley Dean Witter
        Institutional Fund, Inc.
- --------------------------------------------------------------------------------
INVESTMENTS (UNAUDITED)
MARCH 31, 1999
- --------------------------------------------------------------------------------

MUNICIPAL BOND PORTFOLIO
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
 FACE
AMOUNT                                                         VALUE
 (000)                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------

TAX-EXEMPT INSTRUMENTS (98.5%)
  FIXED RATE INSTRUMENTS (98.5%)
$   500    California Housing Finance Agency Single Family
             Mtg., 5.05%, 8/01/17...........................  $    509
  1,000    California Housing Finance Agency Single Family
             Mtg., 5.00%, 8/01/17...........................       995
  1,000    California State, 5.25%, 10/01/10................     1,074
  1,000    California State, Department of Water Revenue
             Bonds, Series Q, 6.00%, 12/01/10...............     1,146
  1,220    City of Dallas, Texas, General Obligation Bonds,
             6.00%, 2/15/06.................................     1,352
  1,500    Connecticut State, General Obligation Bonds,
             Series E, 6.00%, 3/15/12.......................     1,711
  1,095    Connecticut State, Housing Finance Authority,
             Revenue Bonds, Sub. Series D-1, 6.20%,
             5/15/07........................................     1,154
    525    Delaware Transit Authority 5.75%, 7/01/08........       563
    500    Fairfax County, Virginia, Water Authority Revenue
             Bonds, 6.00%, 4/01/22 Prerefunded 4/01/07 at
             102............................................       569
  1,500    Florida State Board of Education, Capital Outlay,
             Public Education, General Obligation Bonds,
             6.40%, 06/01/19................................     1,617
    160    Georgia State, General Obligation Bonds, Series
             B, 6.00%, 3/01/12..............................       182
    500    Georgia State, General Obligation Bonds, Series
             F, 6.50%, 12/01/06.............................       579
  1,000    Gwinnett County, Georgia, General Obligation
             Bonds, 6.00%, 1/01/11..........................     1,084
  1,000    Hawaii State, General Obligation Bonds, Series
             CJ, 6.20%, 1/01/12 Prerefunded 1/15/05 at
             100............................................     1,111
    570    Huntsville, Alabama, General Obligation Bonds,
             Series A, 5.50%, 2/01/20.......................       589
  1,000    Kentucky State Housing Corp., Revenue Bonds,
             Series A, 6.00%, 7/01/10.......................     1,060
  1,625    Michigan State Housing Development Authority,
             Revenue Bonds, Series A, 6.75%, 12/01/14.......     1,744
  1,400    Mississippi State, General Obligation Bonds,
             6.00%, 2/01/09, Prerefunded 2/01/05 at 100.....     1,540
  1,500    Municipal Assistance Corp. for City of New York,
             NY, Revenue Bonds, 6.00%, 7/01/04..............     1,644
    960    Ohio State, Housing Finance Agency, Residential
             Mortgage Revenue Bonds, Series A-1, 6.20%,
             9/01/14........................................     1,030
  1,000    Orlando, Florida, Utilities Commission Water &
             Electric, Revenue Bonds, Series D, 6.75%,
             10/01/17.......................................     1,211

<CAPTION>

 FACE
AMOUNT                                                         VALUE
 (000)                                                         (000)
<C>        <S>                                                <C>
- ----------------------------------------------------------------------
$   600    Salt Lake City, Utah, General Obligation Bonds,
             6.375%, 6/15/11................................  $    631
  1,385    Shelby County, Tennessee, General Obligation
             Bonds, Series B, 5.50%, 8/01/10................     1,515
  1,500    Texas State, Public Finance Authority, Series A,
             5.95%, 10/01/15 Prerefunded 4/01/05 at 100.....     1,650
    500    Triborough Bridge & Tunnel Authority, New York,
             Revenue Bonds, Series Y, 6.00%, 1/01/12........       566
  1,000    Utah State, Housing Financing Agency, Single
             Family Mortgage Revenue Bonds, Series G-1,
             Class I, 5.50%, 7/01/16........................     1,026
    500    Virginia State Housing Development Authority,
             Commonwealth Mortgage Revenue Bonds, Series B,
             6.60%, 1/01/12.................................       536
  1,000    Washington State, General Obligation Bonds,
             Series B, 6.40%, 6/01/17.......................     1,175
  1,115    Wisconsin State, General Obligation Bonds, Series
             2, 5.125%, 11/01/11............................     1,175
                                                              --------
  TOTAL FIXED RATE INSTRUMENTS (Cost $29,271)...............    30,738
                                                              --------
TOTAL TAX-EXEMPT INSTRUMENTS (Cost $29,271).................    30,738
                                                              --------
</TABLE>

<TABLE>
<S>                                                         <C>
TOTAL INVESTMENTS 98.5% (Cost $29,271)....................      30,738
                                                            ----------
OTHER ASSETS AND LIABILITIES (1.5%)
  Other Assets............................................         523
  Liabilities.............................................         (52)
                                                            ----------
                                                                   471
                                                            ----------
NET ASSETS (100%).........................................  $   31,209
                                                            ----------
                                                            ----------
</TABLE>

<TABLE>
<S>                                                             <C>
CLASS A:
- --------------------------------------------------------------
NET ASSETS....................................................     $31,209
NET ASSET VALUE, OFFERING AND REDEMPTION
  PRICE PER SHARE
  Applicable to 3,011,663 outstanding $0.001 par value shares
  (authorized 500,000,000 shares).............................      $10.36
                                                                ----------
                                                                ----------
</TABLE>

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

Prerefunded Bonds -- Outstanding bonds have been refunded to the first call date
(prerefunded date) by the issuance of new bonds. Principal and interest are paid
from monies escrowed in U.S. Treasury securities. Prerefunded bonds are
generally re-rated AAA due to the U.S. Treasury escrow.

- --------------------------------------------------------------------------------
                                                        Municipal Bond Portfolio

                                      119
<PAGE>
              MORGAN STANLEY DEAN WITTER INSTITUTIONAL FUND, INC.

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

DIRECTORS

Barton M. Biggs
CHAIRMAN OF THE BOARD
 Chairman and Director, Morgan Stanley Dean Witter
  Investment Management Inc. and Morgan Stanley Dean Witter
  Investment Management Limited; Managing
  Director, Morgan Stanley & Co. Incorporated

Michael F. Klein
DIRECTOR AND PRESIDENT
 Principal, Morgan Stanley Dean Witter Investment
  Management Inc. and Morgan Stanley & Co.
  Incorporated
John D. Barrett II
Chairman and Director,
Barrett Associates, Inc.

Gerard E. Jones
Partner, Richards & O'Neil LLP
Andrew McNally IV
River Road Partners
Samuel T. Reeves
Chairman of the Board and Chief
Executive Officer,
Pinacle L.L.C.
Fergus Reid
Chairman and Chief Executive Officer,
LumeLite Plastics Corporation
Frederick O. Robertshaw
Of Counsel, Copple, Chamberlin & Boehm, P.C.

INVESTMENT ADVISER AND ADMINISTRATOR

Morgan Stanley Dean Witter Investment Management Inc.
1221 Avenue of the Americas
New York, New York 10020

DISTRIBUTOR

Morgan Stanley & Co. Incorporated
1221 Avenue of the Americas
New York, New York 10020

CUSTODIAN

The Chase Manhattan Bank
3 Chase MetroTech Center
Brooklyn, New York 11245

LEGAL COUNSEL

Morgan, Lewis & Bockius LLP
1701 Market Street
Philadelphia, Pennsylvania 19103-2921

INDEPENDENT ACCOUNTANTS

PricewaterhouseCoopers LLP
1177 Avenue of the Americas
New York, New York 10036

OFFICERS
Stefanie V. Chang
VICE PRESIDENT
ACTING SECRETARY

Harold J. Schaaff, Jr.
VICE PRESIDENT

Joseph P. Stadler
VICE PRESIDENT

Karl O. Hartmann
ASSISTANT SECRETARY

Joanna M. Haigney
TREASURER

Belinda A. Brady
ASSISTANT TREASURER

FOR CURRENT PERFORMANCE, CURRENT NET ASSET VALUE, OR FOR ASSISTANCE WITH YOUR
ACCOUNT, PLEASE CONTACT THE FUND AT (800) 548-7786, OR VISIT OUR WEBSITE AT
www.msdw.com/institutional/investmentmanagement. THIS REPORT IS AUTHORIZED FOR
DISTRIBUTION ONLY WHEN PRECEDED OR ACCOMPANIED BY PROSPECTUSES OF THE MORGAN
STANLEY DEAN WITTER INSTITUTIONAL FUND, INC.

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

                                      120


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