DREYFUS INSTITUTIONAL MONEY MARKET FUND INC
N-30D, 2000-08-22
Previous: FORUM FUNDS, 497, 2000-08-22
Next: SCUDDER US TREASURY MONEY FUND, 24F-2NT, 2000-08-22




Dreyfus

Institutional

Money Market Fund

SEMIANNUAL REPORT June 30, 2000

(reg.tm)





The  views  expressed herein are current to the date of this report. These views
and  the  composition  of the fund's portfolio are subject to change at any time
based on market and other conditions.

           * Not FDIC-Insured * Not Bank-Guaranteed * May Lose Value


                                 Contents

                                 THE FUND
--------------------------------------------------

                             2   Letter from the President

                             3   Discussion of Fund Performance

                             6   Statement of Investments

                            10   Statement of Assets and Liabilities

                            11   Statement of Operations

                            12   Statement of Changes in Net Assets

                            13   Financial Highlights

                            15   Notes to Financial Statements

                                 FOR MORE INFORMATION
---------------------------------------------------------------------------

                                 Back Cover

                                                                       The Fund

                                                          Dreyfus Institutional

                                                              Money Market Fund

LETTER FROM THE PRESIDENT

Dear Shareholder:

We are pleased to present this semiannual report for Dreyfus Institutional Money
Market Fund, covering the six-month period from January 1, 2000 through June 30,
2000.  Inside,  you' ll find valuable information about how the fund was managed
during  the  reporting  period, including a discussion with the fund's portfolio
manager, Thomas S. Riordan.

When  the  reporting  period  began,  international  and domestic economies were
growing   rapidly,  giving  rise  to  concerns  that  long-dormant  inflationary
pressures  might  reemerge.  Consumers  continued to spend heavily, unemployment
levels  reached  new lows and the stock market, while highly volatile, generally
continued to climb.

Because  robust  economic  growth  may trigger an acceleration of inflation, the
Federal  Reserve  Board  raised key short-term interest rates three times during
the  reporting  period,  for  a  total increase of 1.00 percentage points. These
interest-rate  hikes  contributed  to  a  total  interest-rate  increase of 1.75
percentage  points  since  late  June  1999, before the current reporting period
began.  While these economic influences generally adversely affected longer term
bonds, they positively influenced money market yields.

We  appreciate  your confidence over the past six months, and we look forward to
your continued participation in Dreyfus Institutional Money Market Fund.

Sincerely,


Stephen E. Canter
President and Chief Investment Officer
The Dreyfus Corporation
July 17, 2000




DISCUSSION OF FUND PERFORMANCE

Thomas S. Riordan, Portfolio Manager

How did Dreyfus Institutional Money Market Fund perform during the period?

For  the  six-month  period  ended  June  30, 2000, the fund produced annualized
yields  of  5.60%  for  its  Money  Market  Series  and 5.08% for its Government
Securities Series. Taking into account the effect of compounding, the annualized
effective yields were 5.74% for the fund's Money Market Series and 5.20% for its
Government Securities Series.(1)

What is the fund's investment approach?

The  fund seeks a high level of income as is consistent with the preservation of
capital and the maintenance of liquidity. To pursue this goal:

*The  fund' s  Money  Market  Series invests in a diversified portfolio of high
quality,   short-term  debt  securities.  These  include  securities  issued  or
guaranteed  as  to principal and interest by the U.S. Government or its agencies
or  instrumentalities,  certificates of deposit, short-term securities issued by
domestic  or  foreign  banks,  repurchase  agreements,  asset-backed securities,
domestic commercial paper and other short-term corporate obligations of domestic
issuers, including those with floating or variable rates of interest.

*The  fund's Government Securities Series invests only in short-term securities
issued  or guaranteed as to principal and interest by the U.S. Government or its
agencies  or  instrumentalities  and  repurchase  agreements in respect of these
securities.

What factors influenced the fund's performance?

The  money  markets  continued  to  digest mixed signals from the economy as the
reporting  period  began. The Open Market Committee of the Federal Reserve Board
(the  "Fed" ) had  acted  to  relieve inflationary pressures, taking a cautious,
measured  approach.  It had raised interest rates three times in 1999, each time
by    0.25    percentage
                                                                        The Fund


DISCUSSION OF FUND PERFORMANCE (CONTINUED)

points.  Each  tightening  brought  renewed  debate  as  to  whether  rates were
sufficiently  high  to  ease  growth  and head off inflation, or whether further
tightening  would  be necessary. Economic data released in early January pointed
toward the possibility of additional interest-rate increases in the near future.

Gross  domestic  product  (" GDP" ) growth  had quickened to a stunning 7.3% for
fourth  quarter  1999.  Concern  mounted  that  economic growth was accelerating
considerably past a limit that could be sustained without triggering destructive
levels  of  inflation.  In  a  continuing attempt to head off inflation, the Fed
raised  interest  rates for the fourth time in this cycle of tightening in early
February, and a fifth time in March.

Preliminary  first  quarter 2000 figures showed GDP growth at a less torrid, but
still  strong  5.4% . Continuing  indications  that  prices, most notably in the
energy  sector, were moving higher added to the money market's concerns. Greater
than  expected  domestic  demand  for  goods and services continued. As overseas
economies  have recovered, their demand for raw materials has picked up as well,
creating a global upward pressure on prices.

Through much of early 2000, consumer confidence and consumer spending showed few
signs of abating in response to gradual and relatively mild rate hikes. Home and
auto  sales  continued  at  record  paces through the first quarter and into the
second  quarter  of  2000.  The  tightest U.S. labor market in the past 30 years
added  the  threat of wage-driven inflation. Such price and wage factors led the
Fed  to  its  largest  rate  hike in its current credit tightening cycle: a 0.50
percentage-point increase at its May 16th meeting.

More  recently,  we have seen signs that the Fed's series of rate hikes may have
begun  to slow the economy. Retail sales declined in both April and May, housing
starts  have  slowed  dramatically,  and  inflation  figures  through early 2000
appeared to be lower than market expectations. As a result, the Fed chose not to
tighten rates further at its June 28th meeting.


But  economic signals remain contradictory; it is not clear that the economy has
yet  cooled  sufficiently  for  the  Fed  to  consider its job done. Immediately
following  the  Fed' s  June  meeting, economic reports indicated that, although
growth  may  be  slowing, inflation may be higher than previously thought. While
indexes  measuring  demand  for  housing and labor declined in May, the personal
consumption expenditures price index for first quarter 2000 was adjusted upward,
from  3.1%  to  3.5%. This measure, closely followed by Federal Reserve Chairman
Greenspan,  is  generally  considered  by  many  to  be among the best gauges of
inflation  and  could  indicate  that  Fed-described  concerns  over "heightened
inflation pressure" may lead to a further tightening when the Fed meets again in
August.

What is the fund's current strategy?

In  anticipation  of  rising  interest  rates throughout the six-month reporting
period,  the  fund adopted a somewhat defensive strategy. Most significantly, we
reduced  the  fund' s  average  maturity  in  order to increase its flexibility.
Shorter  maturities  were  designed  to  help  the  fund  take  advantage of any
potential opportunities from additional interest-rate increases.

As  of  June 30, 2000, the fund's average maturity remained relatively short. We
will continue to monitor the situation, including the economy and changes in the
Fed' s monetary policy, and we will look to take what we believe are appropriate
actions in response with respect to the fund's portfolio.

July 17, 2000

(1)  ANNUALIZED EFFECTIVE YIELD IS BASED UPON DIVIDENDS DECLARED DAILY AND
REINVESTED MONTHLY. PAST PERFORMANCE IS NO GUARANTEE OF FUTURE RESULTS. YIELDS
FLUCTUATE. AN INVESTMENT IN THE FUND IS NOT INSURED OR GUARANTEED BY THE FDIC OR
THE U.S. GOVERNMENT. ALTHOUGH THE FUND SEEKS TO PRESERVE THE VALUE OF YOUR
INVESTMENT AT $1.00 PER SHARE, IT IS POSSIBLE TO LOSE MONEY BY INVESTING IN THE
FUND.

                                                             The Fund

STATEMENT OF INVESTMENTS
<TABLE>

MONEY MARKET SERIES

June 30, 2000 (Unaudited)

STATEMENT OF INVESTMENTS

                                                                                              Principal
NEGOTIABLE BANK CERTIFICATES OF DEPOSIT--19.4%                                               Amount ($)               Value ($)
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                          <C>                       <C>

Allfirst Bank

   6.64%, 2/9/2001                                                                           20,000,000  (a)          19,992,689

American Express Centurion Bank

   6.59%, 7/19/2000                                                                          25,000,000               25,000,000

First Tennessee Bank N.A.

   6.67%, 12/11/2000                                                                         25,000,000  (a)          25,000,000

South Trust Bank N.A.

   6.55%, 7/11/2000                                                                          25,000,000               25,000,000

Union Bank of California N.A.

   5.98%, 8/1/2000                                                                           21,000,000               21,000,000

TOTAL NEGOTIABLE BANK CERTIFICATES OF DEPOSIT

   (cost $115,992,689)                                                                                               115,992,689
------------------------------------------------------------------------------------------------------------------------------------

COMMERCIAL PAPER--50.7%
------------------------------------------------------------------------------------------------------------------------------------

Associates Corp. of North America

   6.95%, 7/3/2000                                                                           25,000,000               24,990,347

BCI Funding Corp.

   6.50%, 8/2/2000                                                                           22,000,000               21,874,942

Canadian Imperial Holdings Inc.

   6.62%, 8/3/2000                                                                           20,000,000               19,880,650

DaimlerChrysler North America Holding Corp.

   6.25%, 7/18/2000                                                                          25,000,000               24,927,396

Den Danske Corp. Inc.

   6.77%, 8/28/2000                                                                          20,000,000               19,785,722

General Electric Capital Corp.

   6.67%, 9/14/2000                                                                          25,000,000               24,658,333

General Electric Capital Services Inc.

   6.75%, 8/24/2000                                                                          20,000,000               19,801,100

Goldman Sachs Group Inc.

   6.78%, 8/25/2000                                                                          20,000,000               19,796,500

Lehman Brothers Holdings Inc.

   7.40%, 2/12/2001                                                                          15,000,000               14,339,892

Prudential Funding Corp.

   6.88%, 7/3/2000                                                                           13,000,000               12,995,035

San Paolo IMI U.S. Financial Co.

   6.60%, 8/4/2000                                                                           25,000,000               24,846,764

Santander Finance (DE) Inc.

   6.68%, 9/5/2000                                                                           25,000,000               24,698,875

Swedbank Inc.

   6.57%, 7/12/2000                                                                          25,000,000               24,950,347

UBS Finance Delaware LLC

   6.95%, 7/3/2000                                                                           25,000,000               24,990,347

TOTAL COMMERCIAL PAPER

   (cost $302,536,250)                                                                                               302,536,250



                                                                                              Principal
CORPORATE NOTES--18.7%                                                                       Amount ($)                Value ($)
------------------------------------------------------------------------------------------------------------------------------------

Bear Stearns Cos. Inc.

   6.61%-6.68%, 4/17/2001-5/4/2001                                                           20,000,000  (a)          20,009,118

General Motors Acceptance Corp.

   5.96%, 8/7/2000                                                                            4,800,000                4,798,528

Merrill Lynch & Co. Inc.

   6.12%-6.64%, 8/30/2000-3/28/2001                                                          21,000,000  (a)          21,002,464

Morgan (J.P.) & Co. Inc.

   6.67%, 3/6/2001                                                                           26,000,000  (a)          25,998,233

Morgan Stanley Dean Witter & Co.

   6.67%, 3/19/2001                                                                          25,000,000  (a)          25,000,000

Paine Webber Group Inc.

   6.85%, 9/15/2000                                                                          15,000,000  (a)          15,000,000

TOTAL CORPORATE NOTES

   (cost $111,808,343)                                                                                               111,808,343
------------------------------------------------------------------------------------------------------------------------------------

SHORT-TERM BANK NOTES--7.5%
------------------------------------------------------------------------------------------------------------------------------------

AmSouth Bank

   6.75%, 1/19/2001                                                                          20,000,000  (a)          19,996,805

Bank of America NA

   6.25%, 7/20/2000                                                                          25,000,000               25,000,000

TOTAL SHORT-TERM BANK NOTES

   (cost $44,996,805)                                                                                                 44,996,805
------------------------------------------------------------------------------------------------------------------------------------

TIME DEPOSITS--2.9%
------------------------------------------------------------------------------------------------------------------------------------

HSBC Bank USA (London)

  6.75%, 7/3/2000

   (cost $17,048,000)                                                                        17,048,000               17,048,000
------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS
   (cost $592,382,087)                                                                            99.2%              592,382,087

CASH AND RECEIVABLES (NET)                                                                          .8%                5,065,619

NET ASSETS                                                                                       100.0%              597,447,706

(A) VARIABLE INTEREST RATE-SUBJECT TO PERIODIC CHANGE.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund


STATEMENT OF INVESTMENTS

<TABLE>

GOVERNMENT SECURITIES SERIES

June 30, 2000 (Unaudited)

                                                                         Annualized
                                                                           Yield on
                                                                            Date of          Principal
U.S. TREASURY BILLS--56.4%                                             Purchase (%)         Amount ($)                Value ($)
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                            <C>          <C>                       <C>

7/6/2000

   (cost $39,973,333)                                                          4.80         40,000,000               39,973,333
------------------------------------------------------------------------------------------------------------------------------------

U.S. TREASURY NOTES--7.0%
------------------------------------------------------------------------------------------------------------------------------------

5.25%, 5/31/2001

   (cost $4,930,463)                                                           6.61          5,000,000                4,930,463
------------------------------------------------------------------------------------------------------------------------------------

REPURCHASE AGREEMENTS--36.6%
------------------------------------------------------------------------------------------------------------------------------------

Barclays Capital, Inc.

  dated 6/30/2000, due 7/3/2000
  in the amount of $4,952,537
  (fully collateralized by $5,015,000
  U.S. Treasury Notes, 5.00%-6.25%, due

   2/28/2001-4/30/2001,
   value $5,053,413)                                                           6.15         4,950,000                 4,950,000

Bear, Stearns & Co.

  dated 6/30/2000, due 7/3/2000
  in the amount of $5,002,708
  (fully collateralized by $5,170,000
  U.S. Treasury Strips, due

   11/15/2000, value $5,060,396)                                               6.50         5,000,000                 5,000,000

Donaldson, Lufkin & Jenrette Securities Inc.

  dated 6/30/2000, due 7/3/2000
  in the amount of $5,002,729
  (fully collaterlized by $4,996,000
  U.S. Treasury Notes, 5.625%, due

   2/28/2001, value $5,063,226)                                                6.55         5,000,000                 5,000,000

Morgan Stanley Dean Witter & Co.

  dated 6/30/2000, due 7/3/2000
  in the amount of $6,003,235
  (fully collaterlized by $6,010,000
  U.S. Treasury Notes, 5.625%, due

   2/28/2001, value $6,121,185)                                                6.47         6,000,000                 6,000,000


                                                                         Annualized
                                                                           Yield on
                                                                            Date of          Principal
REPURCHASE AGREEMENTS (CONTINUED)                                      Purchase (%)         Amount ($)                Value ($)
------------------------------------------------------------------------------------------------------------------------------------

Warburg Dillon Read, Inc.

  dated 6/30/2000, due 7/3/2000
  in the amount of $5,002,729
  (fully collaterlized by $5,063,000
  U.S.Treasury Notes, 4.50% due

   1/31/2001, value $5,100,973)                                                6.55          5,000,000                 5,000,000

TOTAL REPURCHASE AGREEMENTS

   (cost $25,950,000)                                                                                                 25,950,000
------------------------------------------------------------------------------------------------------------------------------------

TOTAL INVESTMENTS

   (cost $70,853,796)                                                        100.0%                                   70,853,796

CASH AND RECEIVABLES (NET)                                                      .0%                                        2,194

NET ASSETS                                                                   100.0%                                   70,855,990

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund


STATEMENT OF ASSETS AND LIABILITIES

<TABLE>

June 30, 2000 (Unaudited)

                                                                                                      Money            Government
                                                                                                     Market            Securities
                                                                                                     Series                Series
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                                                              <C>                       <C>

ASSETS ($):

Investments in securities, at value (including
   repurchase agreements of $25,950,000
   for the Government Securities Series)--Note 2(b)                                              592,382,087             70,853,796

Cash                                                                                               2,825,006                 10,305

Interest receivable                                                                                2,540,931                 26,880

Prepaid expenses                                                                                      12,409                 10,365

                                                                                                 597,760,433             70,901,346
------------------------------------------------------------------------------------------------------------------------------------

LIABILITIES ($):

Due to The Dreyfus Corporation and affiliates                                                        259,533                 20,270

Accrued expenses                                                                                      53,194                 25,086

                                                                                                     312,727                 45,356
------------------------------------------------------------------------------------------------------------------------------------

NET ASSETS ($)                                                                                   597,447,706             70,855,990
------------------------------------------------------------------------------------------------------------------------------------

COMPOSITION OF NET ASSETS ($):

Paid-in capital                                                                                  597,482,164             70,872,241

Accumulated net realized gain (loss) on investments                                                  (34,458)               (16,251)
------------------------------------------------------------------------------------------------------------------------------------

NET ASSETS ($)                                                                                   597,447,706             70,855,990
------------------------------------------------------------------------------------------------------------------------------------

SHARES OUTSTANDING

(unlimited number of $.001 par value shares

   of Beneficial Interest authorized)                                                            597,482,164              70,872,241
------------------------------------------------------------------------------------------------------------------------------------

NET ASSET VALUE, OFFERING AND REDEMPTION PRICE PER SHARE ($)                                            1.00                   1.00

SEE NOTES TO FINANCIAL STATEMENTS.



STATEMENT OF OPERATIONS

Six Months Ended June 30, 2000 (Unaudited)

                                                                                                      Money            Government
                                                                                                     Market            Securities
                                                                                                     Series                Series
------------------------------------------------------------------------------------------------------------------------------------

INVESTMENT INCOME ($):

INTEREST INCOME                                                                                  18,110,279             2,291,304

EXPENSES--NOTE 2(C):

Management fee-Note 3(a)                                                                          1,464,145               198,971

Shareholder servicing costs-Note 3(b)                                                                84,747                20,101

Custodian fees                                                                                       40,531                19,110

Trustees' fees and expenses-Note 3(c)                                                                33,430                 4,523

Professional fees                                                                                    16,239                13,199

Prospectus and shareholders' reports                                                                  8,067                 2,424

Registration fees                                                                                     7,689                 7,818

Miscellaneous                                                                                         1,741                 1,374

TOTAL EXPENSES                                                                                    1,656,589               267,520

INVESTMENT INCOME--NET                                                                           16,453,690             2,023,784
------------------------------------------------------------------------------------------------------------------------------------

NET REALIZED GAIN (LOSS) ON INVESTMENTS--NOTE 2 (B) ($):                                              3,078                 1,493

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS                                             16,456,768             2,025,277

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>

                                                             The Fund
<TABLE>


STATEMENT OF CHANGES IN NET ASSETS

                                                Money Market Series                            Government Securities Series
                                                ------------------------------------------------------------------------------------
                                  Six Months Ended                                    Six Months Ended
                                     June 30, 2000                Year Ended             June 30, 2000               Year Ended
                                        (Unaudited)        December 31, 1999                (Unaudited)       December 31, 1999
------------------------------------------------------------------------------------------------------------------------------------
<S>                                     <C>                       <C>                       <C>                        <C>

OPERATIONS ($):

Investment income-net                   16,453,690                26,317,437                 2,023,784                  3,378,927

Net realized gain (loss)
   on investments                            3,078                   (3,181)                     1,493                   (17,744)

NET INCREASE (DECREASE)
   IN NET ASSETS RESULTING

   FROM OPERATIONS                      16,456,768               26,314, 256                 2,025,277                  3,361,183
------------------------------------------------------------------------------------------------------------------------------------

DIVIDENDS TO SHAREHOLDERS
   FROM ($):

INVESTMENT
   INCOME--NET                        (16,453,690)              (26,317,437)               (2,023,784)                (3,378,927)
------------------------------------------------------------------------------------------------------------------------------------

BENEFICIAL INTEREST
   TRANSACTIONS
   ($1.00 PER SHARE):

Net proceeds from
   shares sold                       1,832,370,299             3,273,829,754               449,883,691                733,136,152

Dividends reinvested                     5,182,609                 3,084,320                   713,859                  1,327,202

Cost of shares
   redeemed                        (1,832,553,943)           (3,224,747,435)             (462,637,479)              (720,166,100)

INCREASE (DECREASE)
   IN NET ASSETS FROM

   BENEFICIAL INTEREST
   TRANSACTIONS                          4,998,965                52,166,639              (12,039,929)                 14,297,254

TOTAL INCREASE
   (DECREASE)

   IN NET ASSETS                         5,002,043                52,163,458              (12,038,436)                 14,279,510
------------------------------------------------------------------------------------------------------------------------------------

NET ASSETS ($):

Beginning of Period                    592,445,663               540,282,205                82,894,426                 68,614,916

END OF PERIOD                          597,447,706               592,445,663                70,855,990                 82,894,426

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>



FINANCIAL HIGHLIGHTS Money Market Series

The following tables describes the performance for the fiscal periods indicated.
Total return shows how much your investment in the fund would have increased (or
decreased)  during  each  period,  assuming you had reinvested all dividends and
distributions.  These  figures  have  been  derived  from  the  fund's financial
statements.

<TABLE>

                                           Six Months Ended
                                              June 30, 2000                               Year Ended December 31,
                                                                    ----------------------------------------------------------------
                                                (Unaudited)         1999          1998          1997           1996          1995
------------------------------------------------------------------------------------------------------------------------------------
<S>                                                   <C>          <C>            <C>            <C>            <C>           <C>

PER SHARE DATA ($):

Net asset value,

   beginning of period                                1.00          1.00          1.00           1.00          1.00          1.00

Investment Operations:

Investment income--net                                .028          .047          .050           .051          .049          .054

Distributions:

Dividends from
   investment income-net                            (.028)        (.047)        (.050)         (.051)        (.049)        (.054)

Net asset value, end of period                        1.00         1.00          1.00           1.00          1.00          1.00
------------------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%):                                     5.66(a)      4.78          5.14           5.17          5.03          5.57
------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                                 .56(a)        .56           .57            .57           .58           .62

Ratio of net investment income

   to average net assets                             5.60(a)       4.67          5.02           5.06          4.91          5.43
------------------------------------------------------------------------------------------------------------------------------------

Net Assets,
   end of period ($ x 1,000)                       597,448       592,446      540,282        531,436       483,156       401,032

A   ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.

                                                             The Fund



FINANCIAL HIGHLIGHTS Government Securities Series

                                          Six Months Ended
                                             June 30, 2000                                Year Ended December 31,
                                                                    ----------------------------------------------------------------
                                                (Unaudited)         1999          1998          1997           1996          1995
------------------------------------------------------------------------------------------------------------------------------------

PER SHARE DATA ($):

Net asset value,

   beginning of period                                1.00          1.00          1.00           1.00          1.00          1.00

Investment Operations:

Investment income--net                                .025          .043          .048           .048           .047         .052

Distributions:

Dividends from investment
   income-net                                       (.025)        (.043)        (.048)         (.048)        (.047)        (.052)

Net asset value,
   end of period                                      1.00         1.00          1.00           1.00          1.00          1.00
------------------------------------------------------------------------------------------------------------------------------------

TOTAL RETURN (%)                                      5.13(a)      4.34          4.87           4.95          4.84          5.36
------------------------------------------------------------------------------------------------------------------------------------

RATIOS/SUPPLEMENTAL DATA (%):

Ratio of expenses to
   average net assets                                  .67(a)       .68           .68            .61           .63           .65

Ratio of net investment income

   to average net assets                              5.07(a)      4.26          4.76           4.84          4.74          5.23
------------------------------------------------------------------------------------------------------------------------------------

Net Assets, end of period
   ($ x 1,000)                                      70,856       82,894        68,615        107,694       102,726       123,171

A   ANNUALIZED.

SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>



NOTES TO FINANCIAL STATEMENTS (Unaudited)

NOTE 1--General:

Dreyfus  Institutional  Money  Market  Fund (the "fund") is registered under the
Investment  Company  Act  of  1940,  as  amended  (the  "Act"), as a diversified
open-end  management investment company and operates as a series company issuing
two  classes  of Beneficial Interest: the Money Market Series and the Government
Securities  Series. The fund accounts separately for the assets, liabilities and
operations  of  each  series.  The  fund' s  investment  objective is to provide
investors  with  as  high  a  level  of current income as is consistent with the
preservation   of   capital  and  the  maintenance  of  liquidity.  The  Dreyfus
Corporation (the "Manager") serves as the fund's investment adviser. The Manager
is  a direct subsidiary of Mellon Bank, N.A., which is a wholly-owned subsidiary
of  Mellon  Financial  Corporation.  Effective  March  22, 2000, Dreyfus Service
Corporation  (" DSC" ), a  wholly-owned  subsidiary  of  the Manager, became the
distributor  of  the fund's shares, which are sold to the public without a sales
charge.  Prior  to  March  22,  2000, Premier Mutual Fund Services, Inc. was the
distributor.

It  is  the  fund's policy to maintain a continuous net asset value per share of
$1.00  for  each  series;  the  fund  has  adopted certain investment, portfolio
valuation and dividend and distribution policies to enable it to do so. There is
no assurance, however, that the fund will be able to maintain a stable net asset
value per share of $1.00 for each series.

The  funds'  financial  statements  are  prepared  in  accordance with generally
accepted accounting principles which may require the use of management estimates
and assumptions. Actual results could differ from those estimates.

NOTE 2--Significant Accounting Policies:

(a) Portfolio valuation: Investments in securities are valued at amortized cost,
which  has been determined by the fund's Board of Trustees to represent the fair
value of the fund's investments.

                                                             The Fund

 NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

(b)  Securities  transactions and investment income: Securities transactions are
recorded  on  a  trade  date  basis.  Realized  gain  and  loss  from securities
transactions  are  recorded  on  the  identified  cost basis. Interest income is
recognized  on the accrual basis. Cost of investments represents amortized cost.
Under  the  terms of the custody agreement, the Money Market Series receives net
earning  credits  based  on  available  cash balances left on deposit. Under the
terms  of  the  custody agreement, the Government Securities Series received net
earnings  credits  of  $883  during  the  period  ended  June  30, 2000 based on
available  cash  balances  on  deposit.  Income earned under this arrangement is
included in interest.

The  fund  may  enter  into  repurchase  agreements with financial institutions,
deemed  to  be  creditworthy  by  the  fund' s  Manager, subject to the seller's
agreement  to repurchase and the fund's agreement to resell such securities at a
mutually   agreed   upon  price.  Securities  purchased  subject  to  repurchase
agreements are deposited with the fund's custodian and, pursuant to the terms of
the  repurchase  agreement,  must have an aggregate market value greater than or
equal  to  the repurchase price plus accrued interest at all times. If the value
of  the underlying securities falls below the value of the repurchase price plus
accrued  interest,  the  fund  will  require  the  seller  to deposit additional
collateral by the next business day. If the request for additional collateral is
not met, or the seller defaults on its repurchase obligation, the fund maintains
the  right  to  sell the underlying securities at market value and may claim any
resulting loss against the seller.

(c)  Expenses: Expenses directly attributable to each series are charged to that
series'  operations;  expenses which are applicable to both series are allocated
among them on a pro rata basis.

(d) Dividends to shareholders: It is the policy of the fund, with respect to
both series, to declare dividends from investment income-net on each business
day; such dividends are paid monthly. Dividends from net realized capital gain,
with respect to both series, are normally declared and paid annually, but each
series may make distributions on a more frequent basis to comply with the
distribution requirements of the Internal Revenue Code of 1986, as amended (the
"Code"). However, to the extent that a net realized capital gain of either
series can be reduced by a capital loss carryover of that series, such gain will
not be distributed.

(e) Federal income taxes: It is the policy of each series to continue to qualify
as  a  regulated  investment  company,  if  such  qualification  is  in the best
interests  of  its  shareholders, by complying with the applicable provisions of
the  Code,  and to make distributions of taxable income sufficient to relieve it
from substantially all Federal income and excise taxes.

The  Money  Market  Series has an unused capital loss carryover of approximately
$37,500  available  for Federal income tax purposes to be applied against future
net securities profits, if any, realized subsequent to December 31, 1999. If not
applied, $6,500 of the carryover expires in fiscal 2002, $28,000 expires in 2006
and $3,000 expires in fiscal 2007.

The  Government  Securities  Series  has  an  unused  capital  loss carryover of
approximately  $18,000  available  for Federal income tax purposes to be applied
against  future  net securities profits, if any, realized subsequent to December
31, 1999. If not applied, the carryover expires in fiscal 2007.

At  June 30, 2000, the cost of investments of each series for Federal income tax
purposes was substantially the same as the cost for financial reporting purposes
(see the Statements of Investments).

NOTE 3--Management Fee and Other Transactions With Affiliates:

(a)  Pursuant to a management agreement with the Manager, the management fee for
each  series  is  computed  at  the annual rate of .50 of 1% of the value of the
average daily net assets of each series and is payable monthly.

(b)  Under  the  Shareholder Services Plan, each series reimburses DSC an amount
not  to  exceed an annual rate of .25 of 1% of the value of each series' average
daily    net    assets   for   certain   allocated   expenses   of
                                                                        The Fund

 NOTES TO FINANCIAL STATEMENTS (Unaudited) (CONTINUED)

providing   personal  services  and/or  maintaining  shareholder  accounts.  The
services   provided  may  include  personal  services  relating  to  shareholder
accounts,  such  as  answering  shareholder  inquiries  regarding  the  fund and
providing reports and other information, and services related to the maintenance
of shareholder accounts. During the period ended June 30, 2000, the Money Market
Series  and  the  Government Securities Series were charged $24,346 and $15,936,
respectively, pursuant to the Shareholder Services Plan.

The  fund  compensates  Dreyfus Transfer, Inc., a wholly-owned subsidiary of the
Manager,   under  a  transfer  agency  agreement  for  providing  personnel  and
facilities  to  perform transfer agency services for the fund. During the period
ended  June  30,  2000,  the  Money  Market Series and the Government Securities
Series  were  charged $39,802 and $1,293, respectively, pursuant to the transfer
agency agreement.

(c)  Each  Board  member  also  serves  a Board member of other funds within the
Dreyfus  complex  (collectively,  the  "Fund Group"). Effective January 1, 2000,
each  Board  member  who  is  not  an  "affiliated person" as defined in the Act
receives  an  annual  fee of $40,000 and an attendance fee of $6,000 for each in
person  meeting  and $500 for telephone meetings. These fees are allocated among
the  funds  in  the Fund Group. The chairman of the Board receives an additional
25%  of  such  compensation.  Subject to the fund's Emeritus Program Guidelines,
Emeritus  Board  Members,  if any, receive 50% of the fund's annual retainer fee
and per meeting fee paid at the time the Board member achieves emeritus status.



                                                             The Fund

NOTES


                                                           For More Information

                        Dreyfus Institutional Money Market Fund
                        200 Park Avenue
                        New York, NY 10166

                      Manager

                        The Dreyfus Corporation
                        200 Park Avenue
                        New York, NY 10166

                      Custodian

                        The Bank of New York
                        100 Church Street
                        New York, NY 10286

                      Transfer Agent &
                      Dividend Disbursing Agent

                        Dreyfus Transfer, Inc.
                        P.O. Box 9671
                        Providence, RI 02940

                      Distributor

                        Dreyfus Service Corporation
                        200 Park Avenue
                        New York, NY 10166



To obtain information:

BY TELEPHONE
Call 1-800-645-6561

BY MAIL  Write to:
The Dreyfus Family of Funds
144 Glenn Curtiss Boulevard
Uniondale, NY 11556-0144

BY E-MAIL  Send your request
to [email protected]

ON THE INTERNET  Information can be viewed online or downloaded from:

http://www.dreyfus.com

(c) 2000 Dreyfus Service Corporation                               179-195SA006





© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission