JP MORGAN INSTITUTIONAL FUNDS
N-30D, 1998-02-03
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<PAGE>

LETTER TO THE SHAREHOLDERS OF THE J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY
MARKET FUND

January 7, 1998

Dear Shareholder:

Effective January 1, 1998, The JPM Institutional Service Prime Money Market Fund
is now the J.P. Morgan Institutional Service Prime Money Market Fund. When J.P.
Morgan began advising mutual funds over 15 years ago, regulatory restrictions
prevented us from using our name in the title of any mutual fund, which led to
the JPM acronym. With the evolution of today's financial marketplace, we are now
able to proudly include the full J.P. Morgan name in the title of your Fund.

We are pleased to report that the J.P. Morgan Institutional Service Prime Money
Market Fund produced a total return of 1.33% for the period October 23,
1997(commencement of operations) to November 30, 1997, outperforming the 1.24%
return of its benchmark*. In a changing interest rate environment, active
management of the Portfolio's average maturity, as well as its security
selection, were the reasons for the Fund's relative success during the period.

In this report, we have included a portfolio manager Q&A with Robert R. ("Skip")
Johnson, a member of our portfolio management team and lead portfolio manager
for the Fund. In this interview, Skip answers some commonly-asked questions
about the Fund, discusses portfolio activity over the reporting period and
offers an outlook for the months ahead.

As always, we welcome your comments, questions or any suggestions on how we can
further improve your financial reports. Please call J.P. Morgan Funds Services,
toll free, at (800) 766-7722.

Sincerely yours,


/s/Ramon de Oliveira                      /s/ Keith M. Schappert

Ramon de Oliveira                         Keith M. Schappert
Chairman of Asset Management Services     President of Asset Management Services
J.P. Morgan & Co. Incorporated            J.P. Morgan & Co. Incorporated

*    IBC Taxable Money Fund Average through November 30, 1995, and the IBC First
     Tier Money Fund Average thereafter.

- --------------------------------------------------------------------------------
TABLE OF CONTENTS

LETTER TO THE SHAREHOLDERS . . . .1     FUND FACTS AND HIGHLIGHTS. . . . .5

FUND PERFORMANCE . . . . . . . . .2     FINANCIAL STATEMENTS . . . . . . .8

PORTFOLIO MANAGER Q&A. . . . . . .3

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


                                                                               1
<PAGE>

FUND PERFORMANCE


EXAMINING PERFORMANCE
One way to look at performance is to review a fund's average annual total
return. This figure takes the fund's actual (or cumulative) return and shows
what would have happened if the fund had achieved that return by performing at a
constant rate each year. Average annual total returns represent the average
yearly change of a fund's value over various time periods, typically 1, 5, or 10
years (or since inception). Total returns for periods of less than one year are
not annualized and provide a picture of how a fund has performed over the short
term.

<TABLE>
<CAPTION>

PERFORMANCE                                  TOTAL RETURNS            AVERAGE ANNUAL TOTAL RETURNS
                                             --------------------     ---------------------------------------------
                                             THREE       SIX          ONE         THREE        FIVE       TEN
AS OF NOVEMBER 30, 1997                      MONTHS      MONTHS       YEAR        YEARS        YEARS      YEARS
- -----------------------------------------------------------------     ---------------------------------------------
<S>                                          <C>         <C>          <C>         <C>          <C>         <C>
J.P. Morgan Inst. Service Prime
  Money Market Fund                          1.33%       2.70%        5.40%       5.46%        4.59%       5.74%

IBC First Tier Money Fund Average**          1.24%       2.53%        5.02%       5.13%        4.32%       5.46%

Lipper Institutional Money Fund Average      1.32%       2.66%        5.29%       5.40%        4.60%       5.78%

AS OF SEPTEMBER 30, 1997
- -------------------------------------------------------------------------------------------------------------------
J.P. Morgan Inst. Service Prime
  Money Market Fund                          1.35%       2.69%        5.35%       5.42%        4.52%       5.77%

IBC First Tier Money Fund Average**          1.27%       2.52%        4.98%       5.10%        4.25%       5.48%

Lipper Institutional Money Fund Average      1.33%       2.65%        5.25%       5.37%        4.51%       5.81%

</TABLE>


10/23/97 -- COMMENCEMENT OF OPERATIONS (ACTUAL AVERAGE ANNUAL RETURN SINCE
INCEPTION IS 0.57%).

*CONSISTENT WITH APPLICABLE REGULATORY GUIDANCE, PERFORMANCE FOR THE PERIOD
PRIOR TO THE J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY MARKET FUND'S
INCEPTION (10/23/97) REFLECTS THE PERFORMANCE OF THE J.P. MORGAN PRIME MONEY
MARKET FUND, THE PREDECESSOR ENTITY TO THE PRIME MONEY MARKET PORTFOLIO, WHICH
HAD A SIMILAR INVESTMENT OBJECTIVE AND RESTRICTIONS AS THE PORTFOLIO.

**IBC TAXABLE MONEY FUND AVERAGE THROUGH NOVEMBER 30, 1995, AND THE IBC FIRST
TIER MONEY FUND AVERAGE THEREAFTER.

PAST PERFORMANCE IS NOT A GUARANTEE OF FUTURE RESULTS. FUND RETURNS ARE NET OF
FEES, ASSUME THE REINVESTMENT OF DISTRIBUTIONS AND REFLECT REIMBURSEMENT OF
CERTAIN FUND AND PORTFOLIO EXPENSES AS DESCRIBED IN THE PROSPECTUS. HAD EXPENSES
NOT BEEN SUBSIDIZED, RETURNS WOULD HAVE BEEN LOWER. IBC FIRST TIER MONEY FUND
AVERAGE IS THAT OF AN AVERAGE OF FUNDS MANAGED SIMILARLY TO THE FUND. IBC IS A
NATIONALLY RECOGNIZED SOURCE OF MONEY MARKET FUND DATA. LIPPER ANALYTICAL
SERVICES, INC. IS A LEADING SOURCE FOR  MUTUAL FUND DATA.


2
<PAGE>

PORTFOLIO MANAGER Q&A

[PHOTO]

Following is an interview with ROBERT R. ("SKIP") JOHNSON, a member of the
portfolio management team for The Prime Money Market Portfolio, in which the
Fund invests. Prior to joining Morgan in 1988, he held senior positions with the
Bank of Montreal and U.S. Steel. This interview was conducted on January 6, 1998
and reflects Skip's views on that date.

HOW WOULD YOU CHARACTERIZE THE SHORT-TERM FIXED INCOME MARKETS OVER THE PAST 12
MONTHS?

RRJ:  All through 1996 and the first quarter of 1997, short-term interest rates
rose. The Federal Reserve tightened monetary policy by raising interest rates 25
basis points on March 25th, and further tightening was expected. However,
economic growth was perceived to be slowing in June and interest rates rallied a
bit. Then in August, there was new concern that the economy may be experiencing
higher growth and thus the need for the Fed to tighten again.

The Fed tightening last March may have increased short-term rates by 25 basis
points, but there has been a significant rally in the market since then and
short-term yields have fallen as investors sought comfort in the Treasury bill
market. Some of the movement into money market funds was a result of the stock
market turbulence, followed by concerns about the currency crisis in the Pacific
Rim. Also, the supply of Treasury bills has decreased due to an improvement in
the Federal budget deficit. And, as always, many people just want to hold
Treasury bills, regardless of the level of interest rates.

The summer rally ended on September 25, with the 3-month Treasury bill hitting a
low of 4.91%. Since then, fears of an overheated U.S. economy again pushed rates
up. Towards the end of the reporting period, in November, seasonal upward
pressures contributed to the back up in rates.

THE FUND HANDILY BEAT IT'S BENCHMARK, THE IBC FIRST TIER MONEY FUND AVERAGE, AND
THE LIPPER INSTITUTIONAL MONEY FUND AVERAGE. WHAT WERE THE MAIN REASONS FOR THIS
STRONG SHOWING?

RRJ:  There were two main reasons. First, our average maturity decisions were
right on target. The Portfolio was longer than the benchmark throughout the
summer rally. Then we shortened the Portfolio's average maturity in August. This
allowed the Portfolio to take advantage of seasonal pressures by locking in
higher yields in December. Calling that right helped quite a bit.


                                                                               3
<PAGE>

The other half of the story was security selection. The Portfolio held several
issues with above average yields. That included some sovereign Korean commercial
paper, which we held to maturity. While distress in the Korean financial markets
made headlines, the Korean sovereign debt we held was never called into
question. When that matured, the Portfolio was able to add incremental yield by
purchasing Japanese bank paper. We are purchasing paper from the Bank of Tokyo
(A1/P1) and Norinchukin Bank (A1+/P1), the two strongest banks in Japan.

DO YOU THINK THE FED WILL RAISE RATES THIS YEAR?

RRJ:  The Fed appears to be in a holding pattern and I don't think we'll see a
tightening without evidence of inflation. The strong dollar really helped put a
lid on inflation in 1997 and that's still intact. Recently, with signs that our
economy may be slowing, the possibility of easing has been mentioned. But the
Fed is still in the restrictive camp, making that even more unlikely without
evidence of a recession.

WHAT IS YOUR OUTLOOK FOR THE COMING MONTHS?

RRJ:  The Asian turmoil may put an additional drag on the U.S. economy, which
may be slowing somewhat on its own. We are forecasting slower growth and lower
profit margins in 1998. In the near term, we are in the process of locking in
higher yields as the year-end rise in rates appears to be cresting. As I
mentioned earlier, we anticipated this rise due to seasonal pressures and
protected the Portfolio against it. With these pressures peaking, we have begun
to purchase 9-to-12 month securities, lengthening the Portfolio's average
maturity and seeking to take advantage of these seasonal pressures subsiding.


4
<PAGE>

FUND FACTS



INVESTMENT OBJECTIVE
The J.P. Morgan Institutional Service Prime Money Market Fund seeks to provide
current income, maintain a high level of liquidity, and preserve capital. It is
designed for investors who seek to preserve capital and earn current income from
a portfolio of high quality money market instruments.

- --------------------------------------------------------------------------------
COMMENCEMENT OF OPERATIONS
10/23/97

- --------------------------------------------------------------------------------
FUND NET ASSETS AS OF 11/30/97
$384,390

- --------------------------------------------------------------------------------
PORTFOLIO NET ASSETS AS OF 11/30/97
$4,319,645,807

- --------------------------------------------------------------------------------
DIVIDEND PAYABLE DATES
MONTHLY


- --------------------------------------------------------------------------------
SHORT-TERM CAPITAL GAIN PAYABLE DATES (IF APPLICABLE)
MONTHLY
LONG-TERM CAPITAL GAIN PAYABLE DATE(IF APPLICABLE)
12/19/97



EXPENSE RATIO
The Fund's annualized expense ratio of 0.45%
covers shareholders' expenses for custody, tax reporting, investment advisory,
and shareholder services, after reimbursement. The Fund is no-load and does not
charge any sales, redemption, or exchange fees. There are no additional charges
for buying, selling, or safekeeping Fund shares or for wiring redemption
proceeds from the Fund.


FUND HIGHLIGHTS
ALL DATA AS OF NOVEMBER 30, 1997

PORTFOLIO ALLOCATION
(PERCENTAGE OF TOTAL INVESTMENTS)


[CHART]


FLOATING RATE NOTES                          36.2%
CERTIFICATES OF DEPOSIT-FOREIGN              17.7%
COMMERCIAL PAPER-FOREIGN                     16.2%
COMMERCIAL PAPER-DOMESTIC                    14.1%
TIME DEPOSITS-FOREIGN                         6.3%
TIME DEPOSITS-DOMESTIC                        2.6%
REPURCHASE AGREEMENTS                         2.5%
CERTIFICATES OF DEPOSIT-DOMESTIC              1.5%
TAXABLE MUNICIPALS                            1.5%
OTHER                                         1.4%


AVERAGE 7-DAY YIELD
5.39%

AVERAGE MATURITY
34 DAYS


                                                                               5
<PAGE>

DISTRIBUTED BY FUNDS DISTRIBUTOR, INC. MORGAN GUARANTY TRUST COMPANY OF NEW
YORKSERVES AS AN INVESTMENT ADVISOR AND MAKES THE FUND AVAILABLE SOLELY IN ITS
CAPACITY AS SHAREHOLDER SERVICING AGENT. SHARES OF THE FUND ARE NOT BANK
DEPOSITS AND ARE NOT GUARANTEED BY ANY BANK, GOVERNMENT ENTITY, OR THE FDIC.
WHILE THE FUND SEEKS TO MAINTAIN A STABLE NET ASSET VALUE OF $1.00 PER SHARE,
THERE IS NO ASSURANCE THAT IT WILL CONTINUE TO DO SO.

Past performance is no guarantee for future performance. Returns are net of
fees, assume the reinvestment of fund distributions and may reflect the
reimbursement of the fund expenses as described in the prospectus. Had expenses
not been subsidized, returns would have been lower. The fund invests through a
master portfolio(another fund with the same objective).

CALL J.P. MORGAN FUNDS SERVICES AT (800) 766-7722 FOR A PROSPECTUS CONTAINING
MORE COMPLETE INFORMATION ABOUT THE FUND, INCLUDING MANAGEMENT FEES AND OTHER
EXPENSES. PLEASE READ IT CAREFULLY BEFORE INVESTING.



6
<PAGE>


                     THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY
<PAGE>
J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY MARKET FUND
STATEMENT OF ASSETS AND LIABILITIES
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                <C>
ASSETS
Investment in The Prime Money Market Portfolio
  ("Portfolio"), at value                          $394,611
Receivable for Expense Reimbursements                32,194
Deferred Organization Expenses                       10,765
                                                   --------
    Total Assets                                    437,570
                                                   --------
LIABILITIES
Registration Fee Payable                             20,613
Professional Fees Payable                            11,305
Organization Expenses Payable                        11,000
Dividends Payable to Shareholders                       975
Service Organization Fee Payable                        288
Shareholder Servicing Fee Payable                        58
Administrative Services Fee Payable                      35
Trustees' Fee Payable                                    11
Administration Fee Payable                                3
Fund Services Fee Payable                                 1
Accrued Expenses                                      8,891
                                                   --------
    Total Liabilities                                53,180
                                                   --------
NET ASSETS
Applicable to 384,396 Shares of Beneficial
  Interest Outstanding
  (par value $0.001, unlimited shares authorized)  $384,390
                                                   --------
                                                   --------
Net Asset Value, Offering and Redemption Price
  Per Share                                           $1.00
                                                       ----
                                                       ----
ANALYSIS OF NET ASSETS
Paid-in Capital                                    $384,396
Accumulated Net Realized Loss on Investment              (6)
                                                   --------
    Net Assets                                     $384,390
                                                   --------
                                                   --------
</TABLE>
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
8
<PAGE>
J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY MARKET FUND
STATEMENT OF OPERATIONS
FOR THE PERIOD OCTOBER 23, 1997 (COMMENCEMENT OF OPERATIONS) TO NOVEMBER 30,
1997
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                <C>       <C>
INVESTMENT INCOME ALLOCATED FROM PORTFOLIO
Allocated Interest Income                                    $6,824
Allocated Portfolio Expenses                                   (223)
                                                             ------
    Net Investment Income Allocated from
      Portfolio                                               6,601
FUND EXPENSES
Registration Fees                                  $21,303
Professional Fees                                   11,305
Printing Expenses                                    4,825
Transfer Agent Fees                                  3,566
Service Organization Fee                               298
Amortization of Organization Expenses                  235
Shareholder Servicing Fee                               60
Administrative Services Fee                             36
Trustees' Fees and Expenses                             11
Administration Fee                                       3
Fund Services Fee                                        1
Miscellaneous                                          500
                                                   -------
    Total Fund Expenses                             42,143
Less: Reimbursement of Expenses                    (41,830)
                                                   -------
NET FUND EXPENSES                                               313
                                                             ------
NET INVESTMENT INCOME                                         6,288
NET REALIZED LOSS ON INVESTMENT ALLOCATED FROM
  PORTFOLIO                                                      (6)
                                                             ------
NET INCREASE IN NET ASSETS RESULTING FROM
  OPERATIONS                                                 $6,282
                                                             ------
                                                             ------
</TABLE>
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
                                                                               9
<PAGE>
J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY MARKET FUND
STATEMENT OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                    FOR THE PERIOD
                                                   OCTOBER 23, 1997
                                                   (COMMENCEMENT OF
                                                    OPERATIONS) TO
                                                     NOVEMBER 30,
                                                         1997
                                                   ----------------
<S>                                                <C>
INCREASE IN NET ASSETS
FROM OPERATIONS
Net Investment Income                              $         6,288
Net Realized Loss on Investment Allocated from
  Portfolio                                                     (6)
                                                   ----------------
    Net Increase in Net Assets Resulting from
      Operations                                             6,282
                                                   ----------------
DISTRIBUTIONS TO SHAREHOLDERS FROM
Net Investment Income                                       (6,288)
                                                   ----------------
TRANSACTIONS IN SHARES OF BENEFICIAL INTEREST (AT
  A CONSTANT $1.00 PER SHARE)
Proceeds from Shares of Beneficial Interest Sold         3,952,259
Cost of Shares of Beneficial Interest Redeemed          (3,567,863)
                                                   ----------------
    Net Increase from Transactions in Shares of
      Beneficial Interest                                  384,396
                                                   ----------------
    Total Increase in Net Assets                           384,390
NET ASSETS
Beginning of Period                                              0
                                                   ----------------
End of Period                                      $       384,390
                                                   ----------------
                                                   ----------------
</TABLE>
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
10
<PAGE>
J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY MARKET FUND
FINANCIAL HIGHLIGHTS
- --------------------------------------------------------------------------------
Selected data for a share outstanding throughout the period is as follows:
 
<TABLE>
<CAPTION>
                                                    FOR THE PERIOD
                                                   OCTOBER 23, 1997
                                                   (COMMENCEMENT OF
                                                    OPERATIONS) TO
                                                     NOVEMBER 30,
                                                         1997
                                                   ----------------
<S>                                                <C>
NET ASSET VALUE, BEGINNING OF PERIOD               $          1.00
                                                   ----------------
 
INCOME FROM INVESTMENT OPERATIONS
Net Investment Income                                       0.0057
Net Realized Loss on Investment                            (0.0000)(a)
                                                   ----------------
Total from Investment Operations                            0.0057
                                                   ----------------
 
LESS DISTRIBUTIONS TO SHAREHOLDERS FROM
Net Investment Income                                      (0.0057)
                                                   ----------------
Total Distributions to Shareholders                        (0.0057)
                                                   ----------------
 
NET ASSET VALUE, END OF PERIOD                     $          1.00
                                                   ----------------
                                                   ----------------
 
RATIOS AND SUPPLEMENTAL DATA
Total Return                                                  0.57%(b)
Net Assets, End of Period (in thousands)           $           384
Ratios to Average Net Assets
  Expenses                                                    0.45%(c)
  Net Investment Income                                       5.28%(c)
  Decrease Reflected in Expense Ratio due to
    Expense Reimbursement                                    35.10%(c),(d)
</TABLE>
 
- ------------------------
(a) Less than $0.0001.
 
(b) Not annualized.
 
(c) Annualized.
 
(d) Not representative of ongoing reimbursement ratio since period covers less
than two months.
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
                                                                              11
<PAGE>
J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY MARKET FUND
NOTES TO FINANCIAL STATEMENTS
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
1. ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES
 
The J.P. Morgan Institutional Service Prime Money Market Fund (the "Fund") is a
separate series of the J.P. Morgan Institutional Funds, a Massachusetts business
trust (the "Trust") which was organized on November 4, 1992. The Trust is
registered under the Investment Company Act of 1940, as amended, as an open-end
management investment company. The Fund commenced operations on October 23,
1997. Prior to January 1, 1998 the Fund's name was The JPM Institutional Service
Prime Money Market Fund.
 
The Fund invests all of its investable assets in The Prime Money Market
Portfolio (the "Portfolio"), a diversified open-end management investment
company having the same investment objective as the Fund. The value of such
investment included in the Statement of Assets and Liabilities reflects the
Fund's proportionate interest in the net assets of the Portfolio (Less than 1%
at November 30, 1997). The performance of the Fund is directly affected by the
performance of the Portfolio. The financial statements of the Portfolio,
including the Schedule of Investments, are included elsewhere in this report and
should be read in conjunction with the Fund's financial statements.
 
The preparation of financial statements in accordance with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts and disclosures. Actual amounts could differ from
those estimates. The following is a summary of the significant accounting
policies of the Fund:
 
   a) Valuation of securities by the Portfolio is discussed in Note 1 of the
      Portfolio's Notes to Financial Statements which are included elsewhere in
      this report.
 
   b) The Fund records its share of net investment income, realized gain and
      loss and adjusts its investment in the Portfolio each day. All the net
      investment income and realized gain and loss of the Portfolio is allocated
      pro rata among the Fund and other investors in the Portfolio at the time
      of such determination.
 
   c) Substantially all the Fund's net investment income and net realized
      capital gains, if any, are declared as dividends daily and paid monthly.
      Net short term capital gains, if any, will be distributed in accordance
      with the requirements of the Internal Revenue Code of 1986, as amended
      (the "Code"), and may be reflected in the Fund's daily dividends.
      Substantially all the realized net long term capital gains, if any, of the
      Fund are declared and paid on an annual basis, except that an additional
      capital gains distribution may be made in a given year to the extent
      necessary to avoid the imposition of federal excise tax on the Fund.
 
   d) The Fund incurred organization expenses in the amount of $11,000. Morgan
      Guaranty Trust Company of New York ("Morgan") has paid the organization
      expenses of the Fund. The Fund has agreed to reimburse Morgan for these
      costs which are being deferred and will be amortized on a straight-line
      basis over a period not to exceed five years beginning with the
      commencement of operations of the Fund.
 
12
<PAGE>
J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY MARKET FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
   e) The Fund is treated as a separate entity for federal income tax purposes.
      The Fund intends to comply with the provisions of the Code, applicable to
      regulated investment companies and to distribute substantially all of its
      income, including net realized capital gains, if any, within the
      prescribed time periods. Accordingly, no provision for federal income or
      excise tax is necessary.
 
   f ) Expenses incurred by the Trust with respect to any two or more funds in
       the Trust are allocated in proportion to the net assets of each fund in
       the Trust, except where allocations of direct expenses to each fund can
       otherwise be made fairly. Expenses directly attributable to a fund are
       charged to that fund.
 
2. TRANSACTIONS WITH AFFILIATES
 
   a) The Trust, on behalf of the Fund, has retained Funds Distributor, Inc.
      ("FDI"), a registered broker-dealer, to serve as co-administrator and
      distributor for the Fund. Under a Co-Administration Agreement between FDI
      and the Trust on behalf of the Fund, FDI provides administrative services
      necessary for the operations of the Fund, furnishes office space and
      facilities required for conducting the business of the Fund, and pays the
      compensation of the Fund's officers affiliated with FDI. The Fund has
      agreed to pay FDI fees equal to its allocable share of an annual
      complex-wide charge of $425,000 plus FDI's out-of-pocket expenses. The
      amount allocable to the Fund is based on the ratio of the Fund's net
      assets to the aggregate net assets of the Trust and certain other
      investment companies subject to similar agreements with FDI. For the
      period October 23, 1997 (commencement of operations) to November 30, 1997,
      the fee for these services amounted to $3.
 
   b) The Trust, on behalf of the Fund, has an Administrative Services Agreement
      (the "Services Agreement") with Morgan under which Morgan is responsible
      for overseeing certain aspects of the administration and operation of the
      Fund. Under the Services Agreement, the Fund has agreed to pay Morgan a
      fee equal to its allocable share of an annual complex-wide charge. This
      charge is calculated based on the aggregate average net assets of the
      Portfolio and the other portfolios in which the Trust and the J.P. Morgan
      Funds invest (the "Master Portfolios") and J.P. Morgan Series Trust in
      accordance with the following annual schedule: 0.09% on the first $7
      billion of their aggregate average daily net assets and 0.04% of their
      aggregate average daily net assets in excess of $7 billion less the
      complex-wide fees payable to FDI. The portion of this charge payable by
      the Fund is determined by the proportionate share that its net assets bear
      to the net assets of the Trust, the Master Portfolios, other investors in
      the Master Portfolios for which Morgan provides similar services, and J.P.
      Morgan Series Trust. For the period October 23, 1997 (commencement of
      operations) to November 30, 1997, the fee for these services amounted to
      $36.
 
     Morgan has agreed to reimburse the Fund to the extent necessary to maintain
     the total operating expenses of the Fund, including the expenses allocated
     to the Fund from the Portfolio, at no more than 0.45% of the average daily
     net assets of the Fund through March 31, 1999. For the period October 23,
     1997 (commencement of operations) to November 30, 1997, Morgan has agreed
     to reimburse the Fund $41,830 for expenses under this agreement.
 
                                                                              13
<PAGE>
J.P. MORGAN INSTITUTIONAL SERVICE PRIME MONEY MARKET FUND
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
   c) The Trust, on behalf of the Fund, has a Shareholder Servicing Agreement
      with Morgan to provide account administration and personal account
      maintenance service to Fund shareholders. The agreement provides for the
      Fund to pay Morgan a fee for these services which is computed daily and
      paid monthly at an annual rate of 0.05% of the average daily net assets of
      the Fund. For the period October 23, 1997 (commencement of operations) to
      November 30, 1997, the fee for these services amounted to $60.
 
   d) The Trust on behalf of the Fund, has a Service Plan with respect to Fund
      shares which authorizes it to compensate Service Organizations for
      providing account administration and other services to their customers who
      are beneficial owners of such shares. The Fund will enter into agreements
      with Service Organizations which purchase shares on behalf of their
      customers ("Service Agreements"). The Service Agreements provide that the
      Fund pay Service Organizations a fee which is computed daily and paid
      monthly at an annual rate of up to 0.25% of the average daily net assets
      of the Fund with respect to the shares of the Fund attributable to or held
      in the name of the Service Organization for its customers. For the period
      October 23, 1997 (commencement of operations) to November 30, 1997, the
      fee for these services amounted to $298.
 
   e) The Trust, on behalf of the Fund, has a Fund Services Agreement with
      Pierpont Group, Inc. ("Group") to assist the Trustees in exercising their
      overall supervisory responsibilities for the Trust's affairs. The Trustees
      of the Trust represent all the existing shareholders of Group. The Fund's
      allocated portion of Group's costs in performing its services amounted to
      $1 for the period October 23, 1997 (commencement of operations) to
      November 30, 1997.
 
   f) An aggregate annual fee of $75,000 is paid to each Trustee for serving as
      a Trustee of the Trust, the J.P. Morgan Funds, the Master Portfolios, and
      J.P. Morgan Series Trust. The Trustees' Fees and Expenses shown in the
      financial statements represents the Fund's allocated portion of these
      total fees and expenses. The Trust's Chairman and Chief Executive Officer
      also serves as Chairman of Group and receives compensation and employee
      benefits from Group in his role as Group's Chairman. The allocated portion
      of such compensation and benefits included in the Fund Services Fee shown
      in the financial statements was less than $1.
 
3. CONCENTRATION IN SHARES OF BENEFICIAL INTEREST
 
From time to time, the Fund may have a concentration of several shareholders
holding a significant percentage of shares outstanding. Investment activities of
these shareholders could have a material impact on the Fund and Portfolio.
 
14
<PAGE>
REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Trustees and Shareholders of
J.P. Morgan Institutional Service Prime Money Market Fund
(formerly The JPM Institutional Service Prime Money Market Fund)
 
In our opinion, the accompanying statement of assets and liabilities and the
related statements of operations and of changes in net assets and the financial
highlights present fairly, in all material respects, the financial position of
the J.P. Morgan Institutional Service Prime Money Market Fund (one of the series
constituting part of the J.P. Morgan Institutional Funds, formerly The JPM
Institutional Funds, hereafter referred to as the "Fund") at November 30, 1997,
and the results of its operations, the changes in its net assets and the
financial highlights for the period October 23, 1997 (commencement of
operations) to November 30, 1997, in conformity with generally accepted
accounting principles. These financial statements and financial highlights
(hereafter referred to as "financial statements") are the responsibility of the
Fund's management; our responsibility is to express an opinion on these
financial statements based on our audit. We conducted our audit of these
financial statements in accordance with generally accepted auditing standards
which require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement. An
audit includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audit provides a
reasonable basis for the opinion expressed above.
 
PRICE WATERHOUSE LLP
New York, New York
January 20, 1998
 
                                                                              15
<PAGE>
The Prime Money Market Portfolio
 
Annual Report November 30, 1997
 
(The following pages should be read in conjunction
with J.P. Morgan Institutional Service Prime Money Market Fund
Annual Financial Statements)
 
16
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
  PRINCIPAL                                                                                    YIELD TO
    AMOUNT                                                                                    MATURITY/
(IN THOUSANDS)                  SECURITY DESCRIPTION                    MATURITY DATES           RATE            VALUE
- --------------    -------------------------------------------------  ---------------------   ------------   ---------------
<C>               <S>                                                <C>                     <C>            <C>
BANKERS ACCEPTANCE -- FOREIGN (1.1%)
$      50,000     Dai-Ichi Kangyo Bank.............................              12/29/97           5.620%  $    49,781,444
                                                                                                            ---------------
CERTIFICATES OF DEPOSIT -- DOMESTIC (1.5%)
       64,000     Regions Bank.....................................     12/05/97-06/25/98      5.650-6.00        63,991,878
                                                                                                            ---------------
CERTIFICATES OF DEPOSIT -- FOREIGN (17.6%)
      115,000     Deutsche Bank....................................     12/17/97-02/03/98     5.570-5.760       114,999,621
       45,000     Landesbank Hessen Thuringen......................     06/09/98-06/19/98     5.940-6.080        44,988,746
       11,000     National Westminster Bank, PLC...................     03/05/98-05/26/98     5.660-6.060        10,999,041
      180,000     Norinchukin Bank.................................              02/13/98           6.020       180,003,645
       10,000     Rabobank Nederland Inst. CTF.....................              03/24/98           5.990         9,998,521
       10,000     Royal Bank of Canada.............................              05/12/98           6.140         9,998,730
        5,000     San Paolo Bank...................................              12/10/97           5.820         5,000,000
      125,000     Societe Generale.................................              12/02/97           5.560       125,000,000
       75,000     Sumitomo Bank Yankee CD..........................              12/09/97           5.600        75,000,000
      150,000     Swiss Bank Corp..................................              03/19/98     5.760-5.980       149,997,172
       35,000     Westpac Banking Corp.............................              03/23/98           5.970        34,991,776
                                                                                                            ---------------
                  TOTAL CERTIFICATES OF DEPOSIT -- FOREIGN.........                                             760,977,252
                                                                                                            ---------------
COMMERCIAL PAPER -- DOMESTIC (14.1%)
       40,000     Associate Corp. of North America.................              12/18/97           5.510        39,895,922
      205,000     CXC Inc..........................................     12/10/97-02/20/98     5.520-5.690       203,687,303
       28,000     Dupont EI de Nemours & Co........................              06/05/98           5.460        27,210,120
       81,399     Enterprise Funding Corp..........................     12/01/97-12/05/97     5.510-5.540        81,371,204
      109,400     General Electric Capital Corp....................     01/23/98-02/06/98           5.700       108,350,282
       10,385     Southern Co......................................              02/23/98           5.700        10,246,879
       25,000     Trident Capital Finance Inc......................              01/23/98           5.770        24,787,632
      112,943     Windmill Funding Corp............................     12/05/97-02/13/98     5.520-5.800       111,908,318
                                                                                                            ---------------
                  TOTAL COMMERCIAL PAPER -- DOMESTIC...............                                             607,457,660
                                                                                                            ---------------
COMMERCIAL PAPER -- FOREIGN (16.1%)
      110,000     Bank of Montreal.................................              12/04/97           5.592       109,948,740
      199,000     Cregem North America Inc.........................     12/18/97-02/17/98     5.515-5.700       197,958,010
        6,692     Den Danske Bank..................................              12/15/97           5.520         6,677,635
      175,000     Export Import Bank of Korea......................              12/17/97           6.010       174,532,556
       25,000     Halifax Building Society.........................              12/08/97           5.640        24,972,583
       15,500     KFW International Finance, Inc...................              12/04/97           5.520        15,492,870
       28,000     Korea Development Bank...........................              12/23/97           6.000        27,897,333
       35,000     Rabobank Nederland N.V...........................              04/29/98           5.550        34,196,021
</TABLE>
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
                                                                              17
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS (CONTINUED)
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
  PRINCIPAL                                                                                    YIELD TO
    AMOUNT                                                                                    MATURITY/
(IN THOUSANDS)                  SECURITY DESCRIPTION                    MATURITY DATES           RATE            VALUE
- --------------    -------------------------------------------------  ---------------------   ------------   ---------------
<C>               <S>                                                <C>                     <C>            <C>
COMMERCIAL PAPER -- FOREIGN (CONTINUED)
$      47,523     UBS Finance Delaware, Inc........................              12/01/97           5.760%  $    47,523,000
       58,000     Westpac Capital Corp.............................              12/05/97           5.640        57,963,653
                                                                                                            ---------------
                  TOTAL COMMERCIAL PAPER -- FOREIGN................                                             697,162,401
                                                                                                            ---------------
FLOATING RATE NOTES (36.1%)(a)
      100,000     Asset Backed Securities Investment Trust, Series
                   1997-C, (resets monthly to one month LIBOR, due
                   06/15/98) (144A)................................              12/15/97(b)        5.688       100,000,000
       50,000     Asset Backed Securities Investment Trust, Series
                   1997-E, Class N, (resets monthly to one month
                   LIBOR, due 08/15/98) (144A).....................              12/15/97(b)        5.625        50,000,000
       27,800     Asset Backed Securities Investment Trust, Series
                   1995-A, Class 2, (resets monthly to one month
                   LIBOR -3 basis points, due 08/10/98)............              12/10/97(b)        5.607        27,793,943
       60,000     Bankers Trust, (resets daily to Prime rate -281
                   basis points, due 04/23/98).....................              12/01/97(b)        5.690        59,988,623
       64,000     Bankers Trust, (resets daily to Fed Fund rate +5
                   basis points, due 07/07/98).....................              12/01/97(b)        5.580        63,959,367
      100,000     Bayerische Landesbank, (resets monthly to one
                   month LIBOR -13 basis points, due 06/26/98).....              12/26/97(b)        5.558        99,955,883
       31,500     Corestates Bank, (resets monthly to one month
                   LIBOR +3 basis points, due 04/21/98)............              12/31/97(b)        5.598        31,500,000
       10,000     Den Danske Bank, (resets monthly to one month
                   LIBOR -5 basis points, due 03/25/98)............              12/25/97(b)        5.598         9,999,900
       25,000     FCC National Bank, (resets monthly to one month
                   LIBOR -12 basis points, due 07/02/98)...........              12/01/97(b)        5.536        24,989,828
       35,000     FCC National Bank, (resets daily to Fed Fund rate
                   +20 basis points, due 07/23/98).................              12/01/97(b)        5.770        35,017,508
       25,000     First USA Bank, (resets quarterly to three month
                   LIBOR +28 basis points, due 02/17/98)...........              02/17/98(b)        6.125        25,017,090
       20,000     First USA Bank, (resets quarterly to three month
                   LIBOR +9 basis points, due 04/28/98)............              01/28/98(b)        5.930        20,011,181
        7,000     First USA Bank, (resets monthly to one month
                   LIBOR +5 basis points, due 05/07/98)............              12/16/97(b)        5.738         7,002,667
       50,000     First USA Bank, (resets monthly to one month
                   LIBOR +7 basis points, due 05/13/98)............              12/15/97(b)        5.758        50,024,139
        5,000     First USA Bank, (resets quarterly to three month
                   LIBOR + 30 basis points, due 07/29/98)..........              01/16/98(b)        6.144         5,010,816
       15,000     First USA Bank, (resets quarterly to three month
                   LIBOR + 30 basis points, due 09/03/98)..........              12/17/97(b)        6.081        15,039,791
</TABLE>
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
18
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS (CONTINUED)
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
  PRINCIPAL                                                                                    YIELD TO
    AMOUNT                                                                                    MATURITY/
(IN THOUSANDS)                  SECURITY DESCRIPTION                    MATURITY DATES           RATE            VALUE
- --------------    -------------------------------------------------  ---------------------   ------------   ---------------
<C>               <S>                                                <C>                     <C>            <C>
FLOATING RATE NOTES (CONTINUED)
$      20,000     First Union Bank of North Carolina, (resets
                   monthly to one month LIBOR -3 basis points, due
                   12/19/97).......................................              12/19/97(b)        5.720%  $    20,000,000
       44,200     Jacksonville Health Facility Hospital, (resets
                   monthly, due 08/15/14)..........................              12/03/97(b)        5.830        44,200,000
      162,500     Korea Development Bank, (resets quarterly, due
                   06/16/98).......................................              12/16/97(b)        5.843       162,482,994
      138,689     Liquid Asset Backed Securities Trust, Series
                   1997-2, (resets monthly to one month LIBOR, due
                   06/30/98) (144A)................................              12/30/97(b)        5.688       138,689,231
       94,622     Natwest Asset Trust Securities, Series R-13/14A,
                   (resets monthly to one month LIBOR + 2 basis
                   points, due 10/15/01) (144A)....................              12/15/97(b)        5.708        94,622,000
       66,500     Old Kent, (resets daily to Prime rate -285 basis
                   points, due 11/04/98)...........................              12/01/97(b)        5.650        66,500,000
       50,000     PNC Bank, N.A., (resets daily to Fed Fund rate +
                   7 basis points, due 06/04/98)...................              12/01/97(b)        5.720        49,986,098
      100,000     Racers 97-MM-8-6, (resets monthly to one month
                   LIBOR -2 basis points, due 08/28/98) (144A).....              12/28/97(b)        5.615        99,992,805
       75,000     Short Term Card Account Trust, (resets monthly to
                   one month LIBOR + 2 basis points, due 01/15/98)
                   (144A)..........................................              12/15/97(b)        5.504        75,001,364
       45,000     Societe Generale, (resets daily to Fed Fund rate
                   + 9 basis points, due 01/18/98).................              12/01/97(b)        5.610        44,997,802
      137,000     Triangle Funding Ltd. Series 1997-1, (resets
                   quarterly to three month LIBOR, due 11/15/98)
                   (144A)..........................................              01/15/98(b)        5.750       137,000,000
                                                                                                            ---------------
                  TOTAL FLOATING RATE NOTES........................                                           1,558,783,030
                                                                                                            ---------------
TAXABLE MUNICIPALS (1.5%) (a)
       39,240     Sacramento, (resets quarterly to three month
                   LIBOR, due 08/15/14)............................              02/14/98(b)        5.500        39,236,875
       25,000     Wake Forest University, (resets weekly, due
                   07/01/17), LOC Wachovia Bank....................              12/03/97(b)        5.970        25,000,000
                                                                                                            ---------------
                  TOTAL TAXABLE MUNICIPALS.........................                                              64,236,875
                                                                                                            ---------------
TIME DEPOSITS -- DOMESTIC (2.5%)
      110,000     Suntrust Bank....................................              12/01/97     5.500-5.625       110,000,000
                                                                                                            ---------------
</TABLE>
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
                                                                              19
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
SCHEDULE OF INVESTMENTS (CONTINUED)
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
<TABLE>
<CAPTION>
  PRINCIPAL                                                                                    YIELD TO
    AMOUNT                                                                                    MATURITY/
(IN THOUSANDS)                  SECURITY DESCRIPTION                    MATURITY DATES           RATE            VALUE
- --------------    -------------------------------------------------  ---------------------   ------------   ---------------
<C>               <S>                                                <C>                     <C>            <C>
TIME DEPOSITS -- FOREIGN (6.3%)
$     100,000     Deutsche Bank....................................              12/01/97           5.750%  $   100,000,000
      100,000     Wachovia Bank & Trust, Grand Cayman..............              12/01/97           5.510       100,000,000
       70,000     Westdeutsche Landesbank..........................              12/02/97           5.594        70,000,000
                                                                                                            ---------------
                  TOTAL TIME DEPOSITS -- FOREIGN...................                                             270,000,000
                                                                                                            ---------------
U.S. GOVERNMENT AGENCY OBLIGATIONS (0.3%)
       11,725     Student Loan Marketing Association...............              12/01/97           5.630        11,725,000
                                                                                                            ---------------
REPURCHASE AGREEMENTS (2.5%)
        6,129     Goldman Sachs Repurchase Agreement, dated
                   11/28/97, proceeds include interest $6,131,809
                   (collateralized by $6,027,000 U.S. Treasury
                   Notes 6.250%, due 05/31/99 valued at
                   $6,251,824).....................................              12/01/97           5.500         6,129,000
      100,000     Greenwich Capital Repurchase Agreement, dated
                   11/28/97, proceeds include interest $100,047,917
                   (collateralized by $128,432,714 GNMA
                   7.00%-8.250%, due 12/15/08-11/20/27 valued at
                   $102,000,205)...................................              12/01/97           5.750       100,000,000
                                                                                                            ---------------
                                                                                                                106,129,000
                                                                                                            ---------------
                  TOTAL INVESTMENTS AT AMORTIZED COST AND VALUE (99.6%)..................................     4,300,244,540
                  OTHER ASSETS IN EXCESS OF LIABILITIES (0.4%)...........................................        19,401,267
                                                                                                            ---------------
                  NET ASSETS (100.0%)....................................................................   $ 4,319,645,807
                                                                                                            ---------------
                                                                                                            ---------------
</TABLE>
 
- ------------------------------
(a)The Coupon rate shown on floating or adjustable rate securities represents
   the rate at the end of the reporting period. The due date in the security
   description reflects the final maturity date.
 
(b) Reflects the next interest rate reset date.
 
144A -- Securities restricted for resale to Qualified Institutional Buyers.
 
LOC -- Letter of Credit
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
20
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
STATEMENT OF ASSETS AND LIABILITIES
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                <C>
ASSETS
Investments at Amortized Cost and Value            $4,300,244,540
Cash                                                      487,430
Interest Receivable                                    19,627,584
Prepaid Trustees' Fees                                      6,851
Prepaid Expenses and Other Assets                          22,379
                                                   --------------
    Total Assets                                    4,320,388,784
                                                   --------------
LIABILITIES
Advisory Fee Payable                                      428,293
Custody Fee Payable                                       150,688
Administrative Services Fee Payable                       104,558
Fund Services Fee Payable                                   5,582
Administration Fee Payable                                  4,315
Accrued Expenses                                           49,541
                                                   --------------
    Total Liabilities                                     742,977
                                                   --------------
NET ASSETS
Applicable to Investors' Beneficial Interests      $4,319,645,807
                                                   --------------
                                                   --------------
</TABLE>
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
                                                                              21
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
STATEMENT OF OPERATIONS
FOR THE FISCAL YEAR ENDED NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
<TABLE>
<S>                                                <C>          <C>
INVESTMENT INCOME
Interest Income                                                 $228,228,783
EXPENSES
Advisory Fee                                       $5,063,662
Administrative Services Fee                         1,256,131
Custodian Fees and Expenses                           686,535
Fund Services Fee                                     143,027
Administration Fee                                     96,662
Professional Fees and Expenses                         92,381
Trustees' Fees and Expenses                            70,918
Miscellaneous                                          33,130
                                                   ----------
    Total Expenses                                                 7,442,446
                                                                ------------
NET INVESTMENT INCOME                                            220,786,337
NET REALIZED LOSS ON INVESTMENTS                                    (105,748)
                                                                ------------
NET INCREASE IN NET ASSETS RESULTING FROM
  OPERATIONS                                                    $220,680,589
                                                                ------------
                                                                ------------
</TABLE>
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
22
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
STATEMENT OF CHANGES IN NET ASSETS
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                    FOR THE FISCAL      FOR THE FISCAL
                                                      YEAR ENDED          YEAR ENDED
                                                   NOVEMBER 30, 1997   NOVEMBER 30, 1996
                                                   -----------------   -----------------
<S>                                                <C>                 <C>
INCREASE IN NET ASSETS
FROM OPERATIONS
Net Investment Income                              $     220,786,337   $     185,209,978
Net Realized Gain (Loss) on Investments                     (105,748)            267,432
                                                   -----------------   -----------------
    Net Increase in Net Assets Resulting from
      Operations                                         220,680,589         185,477,410
                                                   -----------------   -----------------
TRANSACTIONS IN INVESTORS' BENEFICIAL INTERESTS
Contributions                                         22,011,079,297      18,847,392,256
Withdrawals                                          (21,760,363,996)    (18,519,575,165)
                                                   -----------------   -----------------
    Net Increase from Investors' Transactions            250,715,301         327,817,091
                                                   -----------------   -----------------
    Total Increase in Net Assets                         471,395,890         513,294,501
NET ASSETS
Beginning of Fiscal Year                               3,848,249,917       3,334,955,416
                                                   -----------------   -----------------
End of Fiscal Year                                 $   4,319,645,807   $   3,848,249,917
                                                   -----------------   -----------------
                                                   -----------------   -----------------
</TABLE>
 
- --------------------------------------------------------------------------------
SUPPLEMENTARY DATA
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                                                    FOR THE PERIOD
                                                                                    JULY 12, 1993
                                                     FOR THE FISCAL YEAR ENDED     (COMMENCEMENT OF
                                                           NOVEMBER 30,             OPERATIONS) TO
                                                   -----------------------------     NOVEMBER 30,
                                                   1997    1996    1995    1994          1993
                                                   -----   -----   -----   -----   ----------------
<S>                                                <C>     <C>     <C>     <C>     <C>
RATIOS TO AVERAGE NET ASSETS
  Expenses                                          0.18%   0.19%   0.19%   0.20%             0.19%(a)
  Net Investment Income                             5.43%   5.29%   5.77%   3.90%             2.98%(a)
  Decrease Reflected in Expense Ratio due to
    Expense Reimbursement                             --    0.00%(b)    --  0.00%(b)              --
</TABLE>
 
- ------------------------
(a) Annualized.
 
(b) Less than 0.01%.
 
The Accompanying Notes are an Integral Part of the Financial Statements.
 
                                                                              23
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
NOTES TO FINANCIAL STATEMENTS
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
1. ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES
 
The Prime Money Market Portfolio (the "Portfolio") is registered under the
Investment Company Act of 1940, as amended (the "Act"), as a no-load, open-end
management investment company which was organized as a trust under the laws of
the State of New York. The Portfolio's investment objective is to maximize
current income and maintain a high level of liquidity. The Portfolio commenced
operations on July 12, 1993. The Declaration of Trust permits the Trustees to
issue an unlimited number of beneficial interests in the Portfolio. Prior to May
12, 1997, the Portfolio's name was The Money Market Portfolio.
 
The preparation of financial statements in accordance with generally accepted
accounting principles requires management to make estimates and assumptions that
affect the reported amounts and disclosures. Actual amounts could differ from
those estimates. The following is a summary of the significant accounting
policies of the Portfolio:
 
   a) Investments are valued at amortized cost which approximates market value.
      The amortized cost method of valuation values a security at its cost at
      the time of purchase and thereafter assumes a constant amortization to
      maturity of any discount or premium, regardless of the impact of
      fluctuating interest rates on the market value of the instruments.
 
      The Portfolio's custodian or designated subcustodians, as the case may be
      under triparty repurchase agreements, take possession of the collateral
      pledged for investments in repurchase agreements on behalf of the
      Portfolio. It is the policy of the Portfolio to value the underlying
      collateral daily on a mark-to-market basis to determine that the value,
      including accrued interest, is at least equal to the repurchase price plus
      accrued interest. In the event of default of the obligation to repurchase,
      the Portfolio has the right to liquidate the collateral and apply the
      proceeds in satisfaction of the obligation. Under certain circumstances,
      in the event of default or bankruptcy by the other party to the agreement,
      realization and/or retention of the collateral or proceeds may be subject
      to legal proceedings.
 
   b) Securities transactions are recorded on a trade date basis. Interest
      income, which includes the amortization of premiums and discounts, if any,
      is recorded on an accrual basis. For financial and tax reporting purposes,
      realized gains and losses are determined on the basis of specific lot
      identification.
 
   c) The Portfolio intends to be treated as a partnership for federal income
      tax purposes. As such, each investor in the Portfolio will be taxed on its
      share of the Portfolio's ordinary income and capital gains. It is intended
      that the Portfolio's assets will be managed in such a way that an investor
      in the Portfolio will be able to satisfy the requirements of Subchapter M
      of the Internal Revenue Code. The cost of securities is substantially the
      same for book and tax purposes.
 
2. TRANSACTIONS WITH AFFILIATES
 
   a) The Portfolio has an Investment Advisory Agreement with Morgan Guaranty
      Trust Company of New York ("Morgan"). Under the terms of the agreement,
      the Portfolio pays Morgan at an annual rate of 0.20% of the Portfolio's
      average daily net assets up to $1 billion and 0.10% on any excess over $1
      billion. For the fiscal year ended November 30, 1997, this fee amounted to
      $5,063,662.
 
24
<PAGE>
THE PRIME MONEY MARKET PORTFOLIO
NOTES TO FINANCIAL STATEMENTS (CONTINUED)
NOVEMBER 30, 1997
- --------------------------------------------------------------------------------
 
   b) The Portfolio has retained Funds Distributor Inc. ("FDI"), a registered
      broker-dealer, to serve as the co-administrator and exclusive placement
      agent. Under a Co-Administration Agreement between FDI and the Portfolio,
      FDI provides administrative services necessary for the operations of the
      Portfolio, furnishes office space and facilities required for conducting
      the business of the Portfolio and pays the compensation of the officers
      affiliated with FDI. The Portfolio has agreed to pay FDI fees equal to its
      allocable share of an annual complex-wide charge of $425,000 plus FDI's
      out-of-pocket expenses. The amount allocable to the Portfolio is based on
      the ratio of the Portfolio's net assets to the aggregate net assets of the
      Portfolio and certain other investment companies subject to similar
      agreements with FDI. For the fiscal year ended November 30, 1997, the fee
      for these services amounted to $96,662.
 
   c) The Portfolio has an Administrative Services Agreement (the "Services
      Agreement") with Morgan under which Morgan is responsible for overseeing
      certain aspects of the administration and operation of the Portfolio.
      Under the Services Agreement, the Portfolio had agreed to pay Morgan a fee
      equal to its allocable share of an annual complex-wide charge. This charge
      is calculated based on the aggregate average daily net assets of the
      Portfolio and certain other portfolios for which Morgan acts as investment
      advisor (the "Master Portfolios") and J.P. Morgan Series Trust in
      accordance with the following annual schedule: 0.09% on the first $7
      billion of their aggregate average daily net assets and 0.04% of their
      aggregate average daily net assets in excess of $7 billion less the
      complex-wide fees payable to FDI. The portion of this charge payable by
      the Portfolio is determined by the proportionate share that its net assets
      bear to the net assets of the Master Portfolios, other investors in the
      Master Portfolios for which Morgan provides similar services, and J.P.
      Morgan Series Trust. For the fiscal year ended November 30, 1997, the fee
      for these services amounted to $1,256,131.
 
      Morgan has agreed to reimburse the Portfolio to the extent necessary to
      maintain the total operating expenses of the Portfolio at no more than
      0.20% of the average daily net assets of the Portfolio through March 31,
      1998. For the fiscal year ended November 30, 1997, there was no
      reimbursement under this agreement.
 
   d) The Portfolio has a Fund Services Agreement with Pierpont Group, Inc.
      ("Group") to assist the Trustees in exercising their overall supervisory
      responsibilities for the Portfolio's affairs. The Trustees of the
      Portfolio represent all the existing shareholders of Group. The
      Portfolio's allocated portion of Group's costs in performing its services
      amounted to $143,027 for the fiscal year ended November 30, 1997.
 
   e) An aggregate annual fee of $75,000 is paid to each Trustee for serving as
      a Trustee of the J.P. Morgan Funds, J.P. Morgan Institutional Funds, the
      Master Portfolios and J.P. Morgan Series Trust. The Trustees' Fees and
      Expenses shown in the financial statements represents the Portfolio's
      allocated portion of the total fees and expenses. Prior to April 1, 1997,
      the aggregate annual Trustee Fee was $65,000. The Portfolio's Chairman and
      Chief Executive Officer also serves as Chairman of Group and receives
      compensation and employee benefits from Group in his role as Group's
      Chairman. The allocated portion of such compensation and benefits included
      in the Fund Services Fee shown in the financial statements was $28,900.
 
                                                                              25
<PAGE>
REPORT OF INDEPENDENT ACCOUNTANTS
 
To the Trustees and Investors of
The Prime Money Market Portfolio
 
In our opinion, the accompanying statement of assets and liabilities, including
the schedule of investments, and the related statements of operations and of
changes in net assets and the supplementary data present fairly, in all material
respects, the financial position of The Prime Money Market Portfolio (the
"Portfolio") at November 30, 1997, the results of its operations for the year
then ended, the changes in its net assets for each of the two years in the
period then ended, and the supplementary data for each of the four years in the
period then ended and for the period July 12, 1993 (commencement of operations)
through November 30, 1993, in conformity with generally accepted accounting
principles. These financial statements and supplementary data (hereafter
referred to as "financial statements") are the responsibility of the Portfolio's
management; our responsibility is to express an opinion on these financial
statements based on our audits. We conducted our audits of these financial
statements in accordance with generally accepted auditing standards which
require that we plan and perform the audit to obtain reasonable assurance about
whether the financial statements are free of material misstatement. An audit
includes examining, on a test basis, evidence supporting the amounts and
disclosures in the financial statements, assessing the accounting principles
used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audits, which included
confirmation of securities at November 30, 1997 by correspondence with the
custodian and brokers and the application of alternative auditing procedures
where confirmations from brokers were not received, provide a reasonable basis
for the opinion expressed above.
 
PRICE WATERHOUSE LLP
New York, New York
January 20, 1998
 
26
<PAGE>

THE J.P. MORGAN INSTITUTIONAL SERVICE FUNDS

     FEDERAL MONEY MARKET FUND

     PRIME MONEY MARKET FUND

     TAX EXEMPT MONEY MARKET FUND

     TREASURY MONEY MARKET FUND



FOR MORE INFORMATION ON THE J.P. MORGAN INSTITUTIONAL SERVICE FUNDS, CALL J.P.
MORGAN FUNDS SERVICES AT (800)766-7722.


J.P. MORGAN
INSTITUTIONAL SERVICE
PRIME MONEY MARKET FUND


ANNUAL REPORT
NOVEMBER 30, 1997


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