DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
N-30D, 1998-11-24
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DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

LETTER TO SHAREHOLDERS

Dear Shareholder:

  We  are  pleased  to provide you with this report on the Dreyfus Institutional
Preferred  Money  Market Fund for the six-month period ended September 30, 1998.
For  the  period,  your  Fund  produced  an annualized yield of 5.57% and, after
taking  into  account  the effect of compounding, the annualized effective yield
was 5.72%.*

Economic Review

So far in 1998, the main regions of the world have had very different economic
fundamentals.  The  U.S.  entered  the  year  with  a  strong  economy near full
employment, with unemployment only slightly above 4%. The tight labor market led
the Federal Reserve to contemplate raising interest rates early in the year. The
U.S.  economy  cooled  enough  that the Fed decided to stand pat for a number of
months  before cutting the Federal Funds rate in September and October. Evidence
of  economic cooling continued to accumulate and worries about the world economy
intensified.  World economic weakness then shifted expectations towards monetary
easing.  After  many  years  of subpar economic growth, continental Europe moved
into a better economic expansion. Unlike the U.S., Europe has substantial excess
capacity  of  productive plant and labor. In Asia, weak economies were pervasive
as a result of the Asian financial crisis. The Latin American economies weakened
as the financial stresses spread throughout that region.

  A  main  influence  on  the  U.S.  economy this year was the foreign financial
crisis  and cooling of the world economy. The positive effects hit first. Actual
inflation  and  expected  inflation  dropped,  causing  a  decline  in long-term
Treasury bond yields and mortgage rates. This caused a boom in housing. The fall
in inflation helped the consumer sector as more of the growth in consumer income
was  left  over  after  inflation to buy goods and services. Consumers benefited
from  a  combination  of  good  growth in income after inflation, a strong labor
market and past increases in the prices of assets they owned.

  The  negative  effect  of  Asian  weakness was directed towards the industrial
sector  more than the consumer sector. Corporate profits weakened, especially in
sectors  sensitive  to  Asia  such  as world-traded commodities (oil, metals and
paper) and exports. One result of the industrial weakness was to cool off a U.S.
economy    that    had    been    growing    rapidly.

  The  major  change  in  the  economic  outlook  over  recent months has been a
downward  shift  in  expectations  for  world  economic  growth. A credit crunch
developed in emerging countries and former communist countries, sharply reducing
the   economic   outlook   for   Asia   and   Latin   America  as  well  as  for
commodity-exporting countries throughout the world. The effect on Europe and the
U.S. has been to lower expectations of profit growth and drive down bond yields

Market sentiment now anticipates further monetary easing in the U.S. and other
industrial  countries as the evidence of a weaker world economy has accumulated.
There  appears to be a shift in the priorities of key policymakers from fighting
potential inflation to restimulating future world economic growth.

Market Environment/Portfolio Focus

  The  economic  forces described above drove down interest rates in late summer
and  early fall, finally breaking them out of the narrow band that had prevailed
earlier in the year.

  A  notable  result was that a worldwide "flight to safety" generated very high
demand  for  U.S.  Treasury  securities in longer maturities, thus driving their
yields  down.  Meanwhile, yields on money market instruments remained strong, at
times causing an inverted yield curve.

  Clearly,  the market was expecting a reduction in overnight lending rates, and
on  September  29th,  the  Fed confirmed this by lowering its Federal Funds rate
from  5.50% to 5.25%. The extent of the easing was less than the market had been
expecting.  However,  in  an  unexpected move, the Fed lowered the Federal Funds
rate  on  October  15 to 5.00% as well as the Discount rate from 5.00% to 4.75%.
The market continues to reflect anticipation of additional easing.

  At  home  as  well as abroad, money market participants are now more concerned
about the possibility of recession than the fear of inflation.

  To  deal  with  these  market  conditions,  we  have  been maintaining average
maturities  somewhat longer than the industry average, on the premise that rates
may  continue  on  a  downward  curve in the immediate future. Of course, we are
prepared  to  shift  gears,  should  this  be  required by changes in the market
outlook.

               Sincerely


               [Patricia A. Larkin signature logo]



               Patricia A. Larkin

               Senior Portfolio Manager

October 20, 1998

New York, N.Y.


*Annualized  effective yield is based on dividends declared daily and reinvested
monthly.


<TABLE>
DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS                       SEPTEMBER 30, 1998 (UNAUDITED)

                                                                                                   Principal

Negotiable Bank Certificates of Deposit--24.9%                                                      Amount           Value
- -------------------------------------------------------                                       _______________   _______________
Abbey National Treasury Services (Yankee)
<S>                                                                                          <C>               <C>
  5.72%, 1/27/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $     25,000,000  $     25,000,000

Bankers Trust Co.

  5.64%, 7/23/99 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         20,000,000        19,990,031

Bayerishe Landesbank (Yankee)

  5.69%, 5/6/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         25,000,000        24,997,631

Credit Agricole Indosuez S.A. (Yankee)

  5.50%, 1/14/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         10,000,000        10,000,000

Creditanstalt Bankverein (Yankee)

  5.77%, 4/16/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         25,000,000        24,993,538

Deutsche Bank AG (Yankee)

  5.70%, 3/22/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         30,000,000        29,992,549

Rabobank Nederland N.V. (Yankee)

  5.81% , 5/5/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         40,000,000        39,992,988

Royal Bank of Canada (Yankee)

  5.61%, 2/23/99 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         50,000,000        49,987,466

Societe Generale (Yankee)

  5.61%-5.80%, 10/9/98-5/28/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         65,000,000        64,984,499

Suedwestdeutsche Landesbank (London)

  5.50%, 12/8/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         50,000,000        50,001,706

SwedBank (Yankee)

  5.70%-5.79%, 10/5/98-7/12/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         55,000,000        54,996,645

Westdeutsche Landesbank Girozentrale (Yankee)

  5.51%, 1/11/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         25,000,000        25,000,000

                                                                                                                _______________

TOTAL NEGOTIABLE BANK CERTIFICATES OF DEPOSIT

  (cost $419,937,053)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                      $   419,937,053

                                                                                                                _______________


Commercial Paper--42.6%
- -------------------------------------------------------

ABN-AMRO North America Finance Inc.

  5.70%, 1/4/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $     25,000,000  $      24,637,813

Associates Corp. of North America

  5.78%, 10/1/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         45,000,000        45,000,000

Bankers Trust N.Y. Corp.

  5.57%, 10/23/98  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         30,000,000        29,901,917

Ciesco L.P.

  5.50%-5.52%, 10/2/98-11/24/98  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         75,000,000        74,587,431

Den Norske Bank ASA

  5.67%, 11/9/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         35,000,000        34,791,079

Deutsche Bank Financial Inc.

  5.57%, 10/15/98  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         30,000,000        29,935,600

DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS (CONTINUED)           SEPTEMBER 30, 1998 (UNAUDITED)

                                                                                                   Principal

Commercial Paper (continued)                                                                        Amount           Value
- -------------------------------------------------------                                       _______________   _______________

Finova Capital Corp.

  5.61%-5.74%, 11/6/98-2/22/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $     64,000,000  $     63,131,700

General Electric Capital Corp.

  5.59%-5.64%, 11/3/98-1/29/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         50,000,000        49,416,000

General Electric Capital Services Inc.

  5.52%-5.59%, 11/2/98-11/3/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         45,000,000        44,776,256

General Electric Co.

  5.57%, 12/31/98  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         50,000,000        49,309,917

Goldman Sachs Group L.P.

  5.55%, 10/16/98  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         20,000,000        19,954,084

Hertz Corp.

  5.51%-5.61%, 10/2/98-11/6/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         80,000,000        79,828,200

Merrill Lynch & Co. Inc.

  5.67%, 1/29/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         40,000,000        39,265,333

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

  5.43%, 1/25/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         25,000,000        24,570,639

Morgan Stanley, Dean Witter & Co.

  5.61%-5.64%, 1/22/99-2/12/99 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         65,000,000        63,756,255

National Rural Utilities Cooperative Finance Corp.

  5.50%-5.52%, 11/6/98-11/10/98  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         39,712,000        39,474,281

Swedbank Inc.

  5.66%, 2/5/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          5,000,000         4,902,986

                                                                                                                _______________

TOTAL COMMERCIAL PAPER

  (cost $717,239,491)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                      $   717,239,491

                                                                                                                _______________


Corporate Notes--10.4%
- -------------------------------------------------------

BankBoston N.A.

  5.66%, 1/11/99 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $     40,000,000  $     39,995,705

Bankers Trust N.Y. Corp.

  5.70%, 1/8/99 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         10,000,000         9,999,471

CIT Group Holdings, Inc.

  5.63%-5.67%, 1/12/99-9/29/99 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . .         75,000,000        74,988,505

Istituto Bancario San Paolo Di Torino

  5.63%, 4/19/99 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         25,000,000        24,994,038

Merrill Lynch & Co. Inc.

  5.62%, 4/19/99 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          5,000,000         5,000,000

Paine Webber Group Inc.

  5.70%, 1/4/99 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         20,000,000        20,000,000

                                                                                                                _______________

TOTAL CORPORATE NOTES

  (cost $174,977,719)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                      $   174,977,719

                                                                                                                _______________


DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF INVESTMENTS (CONTINUED)           SEPTEMBER 30, 1998 (UNAUDITED)

                                                                                                  Principal

Promissory Notes--3.4%                                                                             Amount           Value
- -------------------------------------------------------                                       _______________   _______________

Goldman Sachs Group L.P.

 5.60%-5.87%, 10/2/98-11/12/98 (b,c)

  (cost $57,000,000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $     57,000,000  $     57,000,000

                                                                                                                _______________


Short-Term Bank Notes--15.5%
- -------------------------------------------------------

BankBoston N.A.

  5.63%, 11/2/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $      7,000,000  $      7,000,000

First Union National Bank

  5.61%, 7/23/99 (a) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         50,000,000        50,000,000

Harris Trust & Savings Bank

  5.50%-5.57%, 10/6/98-11/4/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         70,000,000        70,000,000

Lasalle National Bank

  5.61%-5.70%, 2/3/99-7/16/99  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         55,000,000        54,995,359

PNC Bank NA

  5.56%-5.62%, 5/21/99-6/4/99 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . .         55,000,000        54,972,722

SouthTrust Bank N. A.

  5.61%, 7/6/99 (a)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         25,000,000        24,988,847

                                                                                                                _______________

TOTAL SHORT-TERM BANK NOTES

  (cost $261,956,928)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                      $   261,956,928

                                                                                                                _______________


Time Deposits--2.3%
- -------------------------------------------------------

Bayerische Vereinsbank (Grand Cayman)

  5.88%, 10/1/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   $     18,000,000  $     18,000,000

Berliner Handels-und Frankforter Bank (Grand Cayman)

  6.00%, 10/1/98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         20,000,000        20,000,000

                                                                                                                _______________

TOTAL TIME DEPOSITS

  (cost $38,000,000) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                     $     38,000,000

                                                                                                                _______________



TOTAL INVESTMENTS

  (cost $1,669,111,191)  . . . . . . . . . . . . . . . . . . . . . . . . . . .       99.1%                       $1,669,111,191

                                                                                   _______                      _______________


CASH AND RECEIVABLES (NET) . . . . . . . . . . . . . . . . . . . . . . . . . .         .9%                     $     15,052,286

                                                                                   _______                      _______________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..     100.0%                       $1,684,163,477

                                                                                   _______                      _______________

Notes to Statement of Investments:
- -----------------------------------------------------------------------------

(a)  Variable interest rate-subject to periodic change.

(b)These  notes  were  acquired  for  investment,  and  not with the intent to
 distribute or sell.

(c)Security  restricted  as  to public resale. This security was acquired from
 10/2/98-11/2/98  at  a  cost of par value. At September 30, 1998, the aggregate
 value  of  this security was $57,000,000 representing approximately 3.4% of net
 assets and is valued at amortized cost.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF ASSETS AND LIABILITIES            SEPTEMBER 30, 1998 (UNAUDITED)

                                                                                                    Cost            Value

                                                                                              _______________   _______________
<S>                                                                                            <C>               <C>
ASSETS:                          Investments in securities--See Statement of Investments . .   $1,669,111,191    $1,669,111,191

                                 Cash  . . . . . . . . . . . . . . . . . . . . . . . . . .                              727,468

                                 Receivable for investment securities sold . . . . . . . .                           25,162,403

                                 Interest receivable . . . . . . . . . . . . . . . . . . .                           14,368,926

                                                                                                                _______________

                                                                                                                  1,709,369,988

                                                                                                                _______________

LIABILITIES:                     Due to The Dreyfus Corporation and affiliates . . . . . .                              190,280

                                 Payable for investment securities purchased . . . . . . .                           25,000,370

                                 Accrued expenses  . . . . . . . . . . . . . . . . . . . .                               15,861

                                                                                                                _______________

                                                                                                                     25,206,511

                                                                                                                _______________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                       $1,684,163,477

                                                                                                                _______________


REPRESENTED BY:                  Paid-in capital . . . . . . . . . . . . . . . . . . . . .                       $1,684,194,469

                                 Accumulated net realized gain (loss) on investments . . .                             (30,992)

                                                                                                                _______________

NET ASSETS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                       $1,684,163,477

                                                                                                                _______________


SHARES OUTSTANDING

(UNLIMITED NUMBER OF $.001 PAR VALUE SHARES OF BENEFICIAL INTEREST AUTHORIZED) . . . . . .                        1,684,194,469

NET ASSET VALUE, offering and redemption price per share . . . . . . . . . . . . . . . . .                                $1.00

                                                                                                                         ______


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF OPERATIONS       SIX MONTHS ENDED SEPTEMBER 30, 1998 (UNAUDITED)

INVESTMENT INCOME
<S>                                                                                                <C>              <C>
INCOME                           Interest Income . . . . . . . . . . . . . . . . . . . . .                          $41,729,678

EXPENSES                         Management Fee--Note 2(a) . . . . . . . . . . . . . . . .                              735,724

                                                                                                                   ____________

INVESTMENT INCOME--NET . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .                           40,993,954

NET REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS--Note 1(b). . . . . . . . . . . . .                              (28,200)

                                                                                                                   ____________

NET INCREASE IN NET ASSETS RESULTING FROM OPERATIONS . . . . . . . . . . . . . . . . . . .                          $40,965,754

                                                                                                                   ____________


                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

STATEMENT OF CHANGES IN NET ASSETS

                                                                                        Six Months Ended

                                                                                        September 30,1998          Period
                                                                                                                   Ended

                                                                                          (Unaudited)         March 31, 1998*

                                                                                      __________________  __________________
OPERATIONS:
<S>                                                                                      <C>                 <C>
   Investment income--net  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .     $     40,993,954    $     48,129,471

   Net realized gain (loss) from investments . . . . . . . . . . . . . . . . . . . .              (28,200)             (2,792)

                                                                                          _______________     _______________

       Net Increase (Decrease) in Net Assets Resulting from Operations . . . . . . .           40,965,754          48,126,679

                                                                                          _______________     _______________

DIVIDENDS TO SHAREHOLDERS FROM:

   Investment income--net  . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          (40,993,954)        (48,129,471)

                                                                                          _______________     _______________

BENEFICIAL INTEREST TRANSACTIONS ($1.00 per share):

   Net proceeds from shares sold . . . . . . . . . . . . . . . . . . . . . . . . . .        3,651,509,431       5,663,121,791

   Dividends reinvested  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .           40,483,820          47,609,227

   Cost of shares redeemed . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       (3,504,427,897)     (4,214,201,903)

                                                                                          _______________     _______________

       Increase (Decrease) in Net Assets from Beneficial Interest Transactions . . .          187,565,354       1,496,529,115

                                                                                          _______________     _______________

          Total Increase (Decrease) in Net Assets  . . . . . . . . . . . . . . . . .          187,537,154       1,496,526,323

NET ASSETS

   Beginning of period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .        1,496,626,323             100,000

                                                                                          _______________     _______________

   End of period     . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .       $1,684,163,477      $1,496,626,323

                                                                                          _______________     _______________

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

*  From June 11, 1997 (commencement of operations) to March 31, 1998.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
<TABLE>
DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

FINANCIAL HIGHLIGHTS

  Contained  below  is  per  share  operating  performance  data  for a share of
Beneficial  Interest outstanding, total investment return, ratios to average net
assets  and  other supplemental data for each period indicated. This information
has been derived from the Fund's financial statements.

                                                                                 Six Months Ended

                                                                                September 30, 1998         Period Ended


PER SHARE DATA:                                                                     (Unaudited)          March 31, 1998(1)

                                                                                __________________      __________________
<S>                                                                                 <C>                       <C>
   Net asset value, beginning of period  . . . . . . . . . . . . . . . . .          $  1.00                   $  1.00

                                                                                     ______                    ______

   Investment Operations:

   Investment income--net  . . . . . . . . . . . . . . . . . . . . . . . .             .028                      .046

                                                                                     ______                    ______

   Distributions:

   Dividends from investment income--net . . . . . . . . . . . . . . . . .            (.028)                    (.046)

                                                                                     ______                    ______

   Net asset value, end of period  . . . . . . . . . . . . . . . . . . . .          $  1.00                   $  1.00

                                                                                      ______                     ______

                                                                                     ______                    ______

TOTAL INVESTMENT RETURN. . . . . . . . . . . . . . . . . . . . . . . . . .             5.64%(2)                  5.76%(2)

RATIOS/SUPPLEMENTAL DATA:

   Ratio of expenses to average net assets . . . . . . . . . . . . . . . .              .10%(2)                   .10%(2)

   Ratio of net investment income to average net assets  . . . . . . . . .             5.57%(2)                  5.64%(2)

   Net Assets, end of period (000's Omitted) . . . . . . . . . . . . . . .          $1,684,163                 $1,496,626
- ------------------------

(1)   From June 11, 1997 (commencement of operations) to March 31, 1998.

(2)   Annualized.

                      SEE NOTES TO FINANCIAL STATEMENTS.
</TABLE>
DREYFUS INSTITUTIONAL PREFERRED MONEY MARKET FUND
- -----------------------------------------------------------------------------

NOTES TO FINANCIAL STATEMENTS (UNAUDITED)

NOTE 1--SIGNIFICANT ACCOUNTING POLICIES:

  Dreyfus  Institutional  Preferred 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.  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. Premier Mutual Fund
Services,  Inc.  is  the distributor of the Fund's shares, which are sold to the
public    without    a    sales    charge.

  It  is the Fund's policy to maintain a continuous net asset value per share of
$1.00; 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.

  The  Fund' s  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.

  (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.

(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  custodian  agreement, the Fund receives net earnings
credits based on available cash balances left on deposit.

  (C)  DIVIDENDS  TO  SHAREHOLDERS:  It  is  the  policy  of the Fund to declare
dividends  daily  from  investment  income-net. Such dividends are paid monthly.
Dividends from net realized capital gain, if any, are normally declared and paid
annually, but the Fund 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" ). To  the  extent that a net realized capital gain can be
offset  by  capital  loss  carryovers,  it  is  the  policy  of  the Fund not to
distribute such gain.

  (D)  FEDERAL INCOME TAXES: It is the policy of the Fund 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  Fund  has an unused capital loss carryover of approximately $57 available
for  Federal  income  tax  purposes  to be applied against future net securities
profits,  if  any, realized subsequent to March 31, 1998. The carryover does not
include  net  realized securities losses from November 1, 1997 through March 31,
1998,  which  are treated, for Federal income tax purposes, as arising in fiscal
1999. If not applied, the carryover expires in fiscal 2006.

At September 30, 1998, the cost of investments for Federal income tax purposes
was substantially the same as the cost for financial reporting purposes (see the
Statement of Investments).

NOTE 2--MANAGEMENT FEE AND OTHER TRANSACTIONS WITH AFFILIATES:

(A) Pursuant to a management agreement with the Manager, the management fee is
computed  at  the  annual  rate  of .10 of 1% of the value of the Fund's average
daily  net  assets  and is payable monthly. The Manager has agreed to pay all of
the Fund's expenses except the management fee.

  The  Manager  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.

  (B)  Each  trustee  receives  an annual fee of $1,000 and an attendance fee of
$250  per  meeting. The Chairman of the Board receives an additional 25% of such
compensation.

<PAGE>

Dreyfus lion "d" logo                                   (reg.tm)

Dreyfus logo                                   (reg.tm)

DREYFUS INSTITUTIONAL PREFERRED

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

90 Washington Street

New York, NY 10286

TRANSFER AGENT &

DIVIDEND DISBURSING AGENT

Dreyfus Transfer, Inc.

P.O. Box 9671

Providence, RI 02940










Printed in U.S.A.                                              194SA989

Institutional

Preferred Money

Market Fund

Semi-Annual

Report

September 30, 1998



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