STATE STREET RESEARCH MONEY MARKET TRUST
497, 1998-12-31
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[front cover]

[logo: STATE STREET RESEARCH]

Supplement No. 1
- --------------------------------------------------------------------------------
dated January 1, 1999 to
- --------------------------------------------------------------------------------

Prospectus dated August 1, 1998 for:
- --------------------------------------------------------------------------------
     State Street Research Money Market Fund
<PAGE>

   1                            Investor Expenses
- --------------------------------------------------------------------------------

In the Prospectus section captioned "Investor Expenses," the Shareholder Fees
portion of the table is revised as follows:

<TABLE>
<CAPTION>
                                                          Class B(1)
Shareholder Fees                                          and Class B     Class C    Classes E, S & T
- -----------------------------------------------------------------------------------------------------
                   <S>                                        <C>           <C>             <C>
                   Maximum front-end sales charge (load)      0.00          0.00            0.00
                   Maximum deferred sales charge (load)       5.00          1.00            0.00
</TABLE>

In addition, the other column headings for Class B in the table are revised to
read "Class B(1) and Class B" and the figures for Class B are deemed to apply to
Class B(1).

<PAGE>

          Choosing a Share Class, Sales Charges and Other CDSC Policies     2
- --------------------------------------------------------------------------------

The Prospectus sections captioned "Choosing a Share Class" and "Sales Charges"
are revised in their entirety to read as follows, and "Other CDSC Policies" is
added immediately afterward:

[list graphic] Choosing a Share Class

The fund generally offers five share classes, each with its own sales charge and
expense structure: Class B(1), Class C, Class E, Class S and MetLife Securities
Money Fund Class T. The fund also offers Class B shares, but only to current
Class B shareholders through reinvestment of dividends and distributions or
through exchanges from existing Class B accounts of the State Street Research
funds.

Class E is the share class that is generally available for initial investment.
It is also the share class that is used for exchanges with Class A shares of
other State Street Research funds. Class B(1), Class B and Class C are available
only by exchange from the corresponding share class of other funds.

If you are investing through a special program, such as a large
employer-sponsored retirement plan or certain programs available through
financial professionals, you may be eligible to purchase Class S shares.

MetLife Securities Money Fund Class T is for accounts available through MetLife
and its affiliates.

<PAGE>
   3
- ----
Class B(1) -- Back Load

[bullet] Available only to investors exchanging from Class B(1) shares of
         another State Street Research fund

[bullet] No initial sales charge

[bullet] Deferred sales charge of 5% or less on shares you sell within six years

[bullet] Annual distribution/service (12b-1) fee of 1.00%

[bullet] Automatic conversion to Class E shares after eight years, reducing
         future annual expenses

Class B -- Back Load

[bullet] Available only to current Class B shareholders. See page 4 of this
         Supplement for details

Class C -- Level Load

[bullet] Available only to investors exchanging from Class C shares of another
         State Street Research fund

[bullet] No initial sales charge

[bullet] Deferred sales charge of 1%, paid if you sell shares within one year of
         purchase

[bullet] Lower deferred sales charge than Class B(1) shares

[bullet] Annual distribution/service (12b-1) fee of 1.00%

[bullet] No conversion to Class E shares after eight years, so annual expenses
         do not decrease

Class E -- No Load

[bullet] Available to all investors purchasing fund shares directly

[bullet] No sales charge of any kind

[bullet] No distribution/service (12b-1) fee; annual expenses are lower than
         other share classes

Class S -- Special Programs

[bullet] Available only through certain retirement accounts, advisory accounts
         of the investment manager and other special programs, including
         programs through financial professionals with recordkeeping and other
         services; these programs usually involve special conditions and
         separate fees (consult your financial professional or your program
         materials)

[bullet] No sales charges of any kind

[bullet] No distribution/service (12b-1) fees; annual expenses are lower than
         other share classes

MetLife Securities Money Fund Class T

[bullet] For accounts available through MetLife and certain affiliates

[bullet] No sales charge of any kind

[bullet] No distribution/service (12b-1) fee; annual expenses are lower than
         other share classes
<PAGE>

                                                                            4
- --------------------------------------------------------------------------------

Sales Charges

Class B(1) -- Back Load

<TABLE>
<CAPTION>
                            this % of net asset value
 when you sell shares       at the time of purchase (or
 in this year after you     of sale, if lower) is deduct-
 bought them                ed from your proceeds
- --------------------------------------------------------------------------------
<S>                                   <C>
 First year                           5.00

 Second year                          4.00

 Third year                           3.00

 Fourth year                          3.00

 Fifth year                           2.00

 Sixth year                           1.00

 Seventh or eighth year              none
</TABLE>

With Class B(1) shares, you pay no sales charge when you invest, but you are
charged a "contingent deferred sales charge" (CDSC) when you sell shares you
have held for six years or less, as described in the table above. See "Other
CDSC Policies."


Class B(1) shares automatically convert to Class E shares after eight years;
Class E shares have lower annual expenses.

Class B -- Back Load

Class B shares are available only to current shareholders through reinvestment
of dividends and distributions or through exchanges from existing Class B
accounts of the State Street Research funds. Other investments made by current
Class B shareholders will be in Class B(1) shares.

With Class B shares, you are charged a "contingent deferred sales charge" (CDSC)
when you sell shares you have held for five years or less. The CDSC is a
percentage of net asset value at the time of purchase (or of sale, if lower) and
is deducted from your proceeds. When you sell shares in the first year after you
bought them, the CDSC is 5.00%; second year, 4.00%; third year, 3.00%; fourth
year, 3.00%; fifth year, 2.00%; sixth year or later, none. See "Other CDSC
Policies."

Class B shares automatically convert to Class E shares after eight years.

<PAGE>
   5
- ----
Class C -- Level Load

<TABLE>
<CAPTION>
                            this % of net asset value
 when you sell shares       at the time of purchase (or
 in this year after you     of sale, if lower) is deduct-
 bought them                ed from your proceeds
- --------------------------------------------------------------------------------
<S>                                 <C>
 First year                         1.00
 Second year or later               none
</TABLE>

With Class C shares, you pay no sales charge when you invest, but you are
charged a "contingent deferred sales charge" (CDSC) when you sell shares you
have held for one year or less, as described in the table above. See "Other CDSC
Policies."

Class C shares currently have the same annual expenses as Class B(1) shares, but
never convert to Class E shares.

Class E -- No Load;

Class S -- Special Programs;

MetLife Securities Money Fund Class T

These shares have no sales charges.

Other CDSC Policies

The CDSC will be based on the net asset value of the shares at the time of
purchase (or sale, if lower). Any shares acquired through reinvestment are not
subject to the CDSC. There is no CDSC on exchanges into other State Street
Research funds, and the date of your initial investment will continue to be used
as the basis for CDSC calculations when you exchange. To ensure that you pay the
lowest CDSC possible, the fund will always use the shares with the lowest CDSC
to fill your sell requests.

The CDSC is waived on shares sold for participant initiated distributions from
State Street Research prototype employee retirement plans. In other cases, the
CDSC is waived on shares sold for mandatory retirement distributions or for
distributions because of disability or death. Consult your financial
professional or the State Street Research Service Center for more information.

[start sidebar]
[graphic: magnifying glass on paper]
Understanding
Distribution/Service Fees

As noted in the descriptions on the previous pages, Class B(1), Class B and
Class C have an annual distribution/service fee, also called a 12b-1 fee.

Under its current 12b-1 plans, the fund may pay certain distribution and service
fees for these classes out of fund assets. Because 12b-1 fees are an ongoing
expense, they will increase the cost of your investment and, over time, could
potentially cost you more than if you had paid other types of sales charges.

Some of the 12b-1 fee is used to compensate those financial professionals who
sell fund shares and provide ongoing service to shareholders. The table on the
next page shows how these professionals' compensation is calculated.

The fund may continue to pay 12b-1 fees even if the fund is subsequently closed
to new accounts.
[end sidebar]
<PAGE>
                               Dealer Compensation                          6
- --------------------------------------------------------------------------------
The table under the Prospectus section captioned "Dealer Compensation" is
revised in its entirety to read as follows:

<TABLE>
<CAPTION>
Maximum Dealer Compensation
                              Initial commission (%)  Annual fee (%)
- --------------------------------------------------------------------------------
<S>                                    <C>                  <C>
Class B(1)                               --                 0.25

Class B                                  --                 0.25

Class C                                  --                 1.00

Class E                                0.00                 0.00

Class S                                0.00                 0.00

Class T                                0.00                 0.00
</TABLE>

<PAGE>

   7                       Policies for Buying Shares                          
- --------------------------------------------------------------------------------

The Prospectus sections "Policies for Buying Shares -- Minimum Initial
Investments" and "Minimum Additional Investments" are revised in their entirety
to read as follows:

Minimum Initial Investments:

[bullet] $1,000 for accounts that use the Investamatic program*

[bullet] $2,000 for Individual Retirement Accounts*

[bullet] $2,500 for all other accounts

Minimum Additional Investments:

[bullet] $50 for any account

*Except that from January 1, 1999 through April 15, 1999, the minimum is $500
 for Individual Retirement Accounts. Also, the $10 annual administrative fee
 will be waived for new IRAs with $5,000 invested by then.

Control Number: (exp899)SSR-LD                                     SSR-424F-199

<PAGE>

                     State Street Research Money Market Fund
                                   a Series of
                    State Street Research Money Market Trust

                       STATEMENT OF ADDITIONAL INFORMATION

                                 August 1, 1998
   
                        As supplemented January 1, 1999*
    

                                TABLE OF CONTENTS
   
<TABLE>
<CAPTION>
                                                                        Page
                                                                        ----
<S>                                                                      <C>
INVESTMENT OBJECTIVE....................................................  2

ADDITIONAL INVESTMENT POLICIES AND RESTRICTIONS.........................  2

MONEY MARKET INSTRUMENTS................................................  4

ADDITIONAL INFORMATION CONCERNING CERTAIN RISKS AND INVESTMENTS......... 10

THE TRUST, THE FUND AND ITS SHARES...................................... 13

TRUSTEES AND OFFICERS................................................... 16

MANAGEMENT OF THE FUND AND INVESTMENT ADVISORY SERVICES ................ 21

PURCHASE AND REDEMPTION OF SHARES....................................... 22

SHAREHOLDER ACCOUNTS.................................................... 26

NET ASSET VALUE......................................................... 30

PORTFOLIO TRANSACTIONS.................................................. 31

CERTAIN TAX MATTERS..................................................... 35

DISTRIBUTION OF SHARES OF THE FUND...................................... 37

CALCULATION OF PERFORMANCE DATA......................................... 40

CUSTODIAN............................................................... 45

INDEPENDENT ACCOUNTANTS................................................. 45

FINANCIAL STATEMENTS.................................................... 45
</TABLE>
    

        The following Statement of Additional Information is not a Prospectus.
It should be read in conjunction with the Prospectus of State Street Research
Money Market Fund (the "Fund") dated August 1, 1998, as supplemented January 1,
1999, which may be obtained without charge from the offices of State Street 
Research Money Market Trust (the "Trust") or State Street Research Investment 
Services, Inc. (the "Distributor"), One Financial Center, Boston, Massachusetts
02111-2690.

   
*GENERAL NOTE

        The remainder of this Supplement sets forth revisions to the Statement
of Additional Information to reflect changes in the pricing of sales of Fund
shares, including the introduction of new Class B(1) and a Rule 12b-1 Plan for
Class B(1), and limitations on the availability of existing Class B, among other
changes. While the revisions set forth below relate to specific parts of the
Statement of Additional Information directly affected by the changes, the entire
Statement of Additional Information is deemed revised to give effect to the
pricing changes. Revised pages are annotated at the bottom as "supplemented as
of January 1, 1999."
    

CONTROL NUMBER: (exp 0899) SSR-LD                                  MM-465F-0199
<PAGE>

                              INVESTMENT OBJECTIVE

       As set forth under "The Fund--Goal and Strategies--Fundamental Goal" in
the Prospectus of State Street Research Money Market Fund (the "Fund"), the
Fund's investment goal, which is to seek a high level of current income
consistent with the preservation of capital and maintenance of liquidity by
investing in securities issued or guaranteed as to principal and interest by the
U.S. government or its agencies or instrumentalities as well as high-quality,
short-term money market instruments such as bank certificates of deposit,
bankers' acceptances and such short-term corporate debt securities as commercial
paper and master demand notes, is fundamental and may not be changed by the Fund
except by the affirmative vote of a majority of the outstanding voting
securities of the Fund, as defined in the Investment Company Act of 1940, as
amended (the "1940 Act"). (Under the 1940 Act, a "vote of the majority of the
outstanding voting securities" means the vote, at the annual or a special
meeting of security holders duly called, (i) of 67% or more of the voting
securities present at the meeting if the holders of more than 50% of the
outstanding voting securities are present or represented by proxy or (ii) of
more than 50% of the outstanding voting securities, whichever is less.)


                ADDITIONAL INVESTMENT POLICIES AND RESTRICTIONS

       As set forth under "The Fund--Principal Risks" and "Other
Information--Other Securities and Risks" in the Fund's Prospectus, the Fund has
adopted certain investment restrictions, and those investment restrictions are
either fundamental or not fundamental. Fundamental restrictions may not be
changed by the Fund except by the affirmative vote of a majority of the
outstanding voting securities of the Fund. Restrictions that are not fundamental
may be changed by a vote of a majority of the Trustees of the Trust.

       The Fund's fundamental investment restrictions are set forth below. Under
these restrictions, it is the Fund's policy:

       (1)   not to purchase a security of any one issuer (other than securities
             issued or guaranteed as to principal or interest by the U.S.
             Government or its agencies or instrumentalities) if such purchase
             would, with respect to 75% of the Fund's total assets, cause more
             than 5% of the Fund's total assets cause more than 5% of the Fund's
             total assets to be invested in the securities of such issuer or
             cause more than 10% of the voting securities of such issuer to be
             held by the Fund;

       (2)   not to issue senior securities;

       (3)   not to underwrite or participate in the marketing of securities of
             other issuers;

       (4)   not to purchase or sell real estate in fee simple;


                                       2
<PAGE>

       (5)   not to invest in commodities or commodity contracts;

       (6)   not to lend money directly to natural persons; however, the Fund
             may lend portfolio securities and purchase bonds, debentures,
             notes, bills and any other debt-related instruments or interests
             directly from the issuer thereof or in the open market and may
             enter into repurchase transactions collateralized by obligations of
             the U.S. Government and its agencies and instrumentalities or other
             high quality securities;

       (7)   not to conduct arbitrage transactions;

       (8)   not to invest in interests in oil, gas or other mineral exploration
             or development programs (provided that the Fund may invest in
             securities which are based, directly or indirectly, on the credit
             of companies which invest in or sponsor such programs);

       (9)   not to make any investment which would cause more than 25% of the
             value of the Fund's total assets to be invested in the securities
             of issuers principally engaged in any one industry, as based on
             industry classifications as may be described in the Fund's
             Prospectus or Statement of Additional Information, as amended from
             time to time, except that the Fund will invest more than 25% of its
             total assets in the financial services industry and except that
             this limitation does not apply to securities issued or guaranteed
             by the U.S. Government or its agencies or instrumentalities or
             obligations of banks as described in the Fund's Prospectus or
             Statement of Additional Information, as amended from time to time;
             and

       (10)  not to borrow money (through reverse repurchase agreements or
             otherwise) except for extraordinary and emergency purposes, such as
             permitting redemption requests to be honored, and then not in an
             amount in excess of 10% of the value of its total assets, provided
             that additional investments will be suspended during any period
             when borrowings exceed 5% of the Fund's total assets and provided
             further that reverse repurchase agreements shall not exceed 5% of
             the Fund's total assets. Reverse repurchase agreements occur when
             the Fund sells money market securities and agrees to repurchase
             such securities at an agreed-upon price, date and interest payment.
             The Fund would use the proceeds from the transaction to buy other
             money market securities, which are either maturing or under the
             terms of a resale agreement, on the same day as (or day prior to)
             the expiration of the reverse repurchase agreement, and would
             employ a reverse repurchase agreement when interest income from
             investing the proceeds of the transaction is greater than the
             interest expense of the reverse repurchase transaction.

                                       3
<PAGE>

       The following investment restrictions may be changed by a vote of a
majority of the Trustees. Under these restrictions, it is the Fund's policy:

       (1)   not to purchase any security or enter into a repurchase agreement
             if as a result more than 10% of its net assets would be invested in
             securities that are illiquid (including repurchase agreements not
             entitling the holder to payment of principal and interest within
             seven days);

       (2)   not to purchase securities on margin, make a short sale of any
             securities or purchase or deal in puts, calls, straddles or spreads
             with respect to any security;

       (3)   not to hypothecate, mortgage or pledge any of its assets except as
             may be necessary in connection with permitted borrowings and then
             not in excess of 15% of the Fund's total assets, taken at cost;

       (4)   not to purchase a security issued by another investment company,
             except to the extent permitted under the 1940 Act or except by
             purchase in the open market involving only customary brokers'
             commissions, or securities acquired as dividends or distributions
             or in connection with a merger, consolidation or similar
             transaction or other exchange; and

       (5)   not to invest in companies for the purpose of exercising control
             over their management.


                           MONEY MARKET INSTRUMENTS

       The following describes further the money market instruments in which the
Fund may invest, as well as certain debt ratings used by the Fund, and is
provided as a supplement to the discussion appearing in the Fund's Prospectus.

Money Market Instruments
- ------------------------

Short-Term Corporate and Other Securities

       Short-term corporate debt instruments include commercial paper (i.e.,
short-term, unsecured promissory notes) issued by corporations (including bank
holding companies) to finance short-term credit needs. Commercial paper is
usually sold on a discounted basis and has a maturity at the time of issuance
not exceeding nine months.

       Short-term corporate debt instruments also include master demand notes.
Master demand notes are obligations of companies that permit an investor to
invest fluctuating amounts at varying rates of interest pursuant to arrangements
between the investor, as lender, 

                                       4
<PAGE>

and the companies, as borrowers. The Fund will have the right, at any time, to
increase the amount lent up to the full amount provided by a note. Because the
Fund may also decrease the amount lent at any time, such instruments are highly
liquid and in effect have a maturity of one business day. The borrower will have
the right, at any time, to prepay up to the full amount of the amount borrowed
without penalty. Because the notes are direct lending obligations between the
Fund and the borrowers, they are generally not traded and there is no secondary
market. Consequently, the Fund's ability to receive repayment will depend upon
the borrower's ability to pay principal and interest on the Fund's demand. The
Fund will invest only in notes that either have the ratings described below for
commercial paper or (because notes are not typically rated by credit rating
agencies) unrated notes that are issued by companies having the ratings
described below for issuers of commercial paper. The Fund does not expect that
the notes will be backed by bank letters of credit. State Street Research &
Management Company, the Fund's investment manager (the "Investment Manager")
will monitor the value of the Fund's investments in commercial paper and master
demand notes, taking into account such factors as the issuer's earning power,
cash flow and other liquidity ratios.

       Commercial paper investments at the time of purchase will be rated in one
of the two highest rating categories by a nationally recognized statistical
rating organization, such as within the A-1 or A-2 categories by Standard &
Poor's Corporation ("S&P") or within the Prime-1 or Prime-2 categories by
Moody's Investors Service, Inc. ("Moody's"), or, if not rated, issued by
companies having an outstanding debt issue rated at least within the AA category
by S&P or within the Aa category by Moody's or equivalent. See "Debt Securities
Ratings" below for further information.

       Under certain limited circumstances, the Fund may invest in
nonconvertible corporate debt securities (e.g., bonds and debentures which may
be issued by U.S. or Canadian corporations) with no more than 397 calendar days
remaining either to the date of maturity or the date on which, under the
indenture governing the security, it may be sold back to the issuer thereof for
payment of principal and accrued interest. Corporate debt securities with a
remaining maturity of 397 calendar days or less are liquid (and tend to become
more liquid as their maturities lessen) and are traded as money market
securities. Such securities also tend to have considerably less market value
fluctuation than longer term issues.

       Corporate debt and other securities in which the Fund invests must be
U.S. dollar-denominated Eligible Securities (as defined in Rule 2a-7 under the
1940 Act) that are determined to present minimal credit risks. In general, the
term "Eligible Security" is limited to any security that:

       (i)   (a) either (1) has received a short-term rating from a nationally
             recognized statistical rating organization ("NRSRO") or has been
             issued by an issuer that has received a short-term rating from an
             NRSRO with respect to a class of debt obligations(or any debt
             obligation within that class) that is comparable in 

                                       5
<PAGE>


             priority and security with the security or (2) is subject to a
             guarantee that has received a short-term rating from an NRSRO, or a
             guarantee issued by a guarantor that has received a short-term
             rating from an NRSRO with respect to a class of debt obligations
             (or any debt obligation within that class) that is comparable in
             priority and security with the guarantee, (b) has a remaining
             maturity of 397 calendar days or less and (c) has received a rating
             from the requisite number of NRSROs (i.e., two, if two
             organizations have issued ratings and one if only one has issued a
             rating) in one of the two highest short-term major rating
             categories; or

       (ii)  is unrated but is of comparable quality to a rated security as
             described in (i), above, and which at the time of issuance (a) had
             a remaining maturity of more than 397 calendar days and now has a
             remaining maturity of 397 calendar days or less, and (b) has not
             received a long-term rating from an NRSRO in any NRSRO major rating
             category outside of the NRSRO's three highest major rating
             categories, unless the security has receive a long-term rating from
             the requisite number of NRSROs (i.e., two, if two organizations
             have issued ratings and one if only one has issued a rating) in one
             of the three highest long-term major rating categories.

       As indicated in the Fund's Prospectus, at least 95% of the Fund's total
assets will consist of government securities and "first tier" eligible
securities as defined in Rule 2a-7 under the 1940 Act, with the balance of the
Fund's assets invested in "second tier" eligible securities as defined in Rule
2a-7. For this purpose, "second tier" eligible securities generally are those
which have been (i) rated by at least two nationally recognized statistical
rating organizations in one of the two highest rating categories for short-term
obligations (or so rated by one such organization if it alone has rated the
security), (ii) issued by an issuer with comparable short-term obligations that
are rated in one of the two highest rating categories, or (iii) if unrated,
determined to be comparable to such securities. The Fund may not invest more
than the greater of 1% of its total assets or $1 million in "second tier"
eligible securities of any single issuer.

Bank Money Investments

       Bank money investments include but are not limited to certificates of
deposit, bankers' acceptances and time deposits. Certificates of deposit are
generally short-term (i.e., less than one year), interest-bearing negotiable
certificates issued by commercial banks or savings and loan associations against
funds deposited in the issuing institution. A banker's acceptance is a time
draft drawn on a commercial bank by a borrower, usually in connection with an
international commercial transaction (to finance the import, export, transfer or
storage of goods). A banker's acceptance may be obtained from a domestic or
foreign bank including a U.S. branch or agency of a foreign bank. The borrower
is liable for payment as well as the bank, which unconditionally guarantees to
pay the draft at its face amount on the maturity date.

                                       6
<PAGE>

Most acceptances have maturities of six months or less and are traded in
secondary markets prior to maturity. Time deposits are nonnegotiable deposits
for a fixed period of time at a stated interest rate. The Fund will not invest
in any such bank money investment unless the investment is issued by a U.S. bank
that is a member of the Federal Deposit Insurance Corporation ("FDIC"),
including any foreign branch thereof, a U.S. branch or agency of a foreign bank,
a foreign branch of a foreign bank, or a savings bank or savings and loan
association that is a member of the FDIC and which at the date of investment has
capital, surplus and undivided profits (as of the date of its most recently
published financial statements) in excess of $50 million. The Fund will not
invest in time deposits maturing in more than seven days and will not invest
more than 10% of its total assets in time deposits maturing in two to seven
days.

       U.S. branches and agencies of foreign banks are offices of foreign banks
and are not separately incorporated entities. They are chartered and regulated
either federally or under state law. U.S. federal branches or agencies of
foreign banks are chartered and regulated by the Comptroller of the Currency,
while state branches and agencies are chartered and regulated by authorities of
the respective states or the District of Columbia. U.S. branches of foreign
banks may accept deposits and thus are eligible for FDIC insurance; however, not
all such branches elect FDIC insurance. Unlike U.S. branches of foreign banks,
U.S. agencies of foreign banks may not accept deposits and thus are not eligible
for FDIC insurance. Both branches and agencies can maintain credit balances,
which are funds received by the office incidental to or arising out of the
exercise of their banking powers and can exercise other commercial functions,
such as lending activities.

U.S. Treasury Obligations

       U.S. Government securities consist of various types of marketable
securities issued by the U.S. Treasury, that is, bills, notes and bonds. Such
securities are direct obligations of the U.S. Government and differ mainly in
the lengths of their maturities. Treasury bills, the most frequently issued
marketable government security, have a maturity of up to one year and are issued
on a discount basis. U.S. Government securities also include securities issued
under the U.S. Department of Treasury's STRIPS program, which is described in
the Fund's Prospectus.

U.S Government Agency and Similar Securities

       U.S. Government agency securities consist of fixed income securities
issued or guaranteed by agencies and instrumentalities of the U.S. Government,
including the various types of instruments currently outstanding or which may be
offered in the future. Agencies and instrumentalities include, among others, the
Federal Housing Administration, Government National Mortgage Association
("GNMA"), Federal National Mortgage Association, Export-Import Bank of the
U.S., Federal Maritime Administration, General Services Administration and
Tennessee Valley Authority. Instrumentalities include, for example, the Central
Bank for Cooperatives, Federal Home Loan Banks, Federal Farm Credit Banks,
Student Loan

                                       7
<PAGE>

Marketing Association, Federal Home Loan Mortgage Corporation, Federal
Intermediate Credit Banks, Federal Land Banks and the U.S. Postal Service. The
Fund will purchase such securities only so long as they are backed by any of (i)
the full faith and credit of the U.S. Treasury (e.g., U.S. Treasury bills, bonds
and notes and GNMA participation certificates), (ii) the right of the issuer to
borrow a limited amount from the U.S. Treasury (e.g., securities of the Farmers
Home Administration), (iii) the discretionary authority of the U.S. Government
to purchase certain obligations of the agency or instrumentality (e.g.,
securities of the Federal National Mortgage Association) or (iv) the credit of
the agency or instrumentality (e.g., securities of a Federal Home Loan Bank).

       The Fund may also invest in the obligations of mixed-ownership Government
corporations. Certain obligations of Resolution Funding Corporation, a
mixed-ownership Government corporation, are backed with respect to interest
payments by the U.S. Treasury, and with respect to principal payments by U.S.
Treasury obligations held in a segregated account with a Federal Reserve Bank.
Except for certain mortgage-related securities, the Fund will only invest in
obligations issued by mixed-ownership Government corporations where such
securities are guaranteed as to payment of principal or interest by the U.S.
Government or a U.S. Government agency or instrumentality, and any unguaranteed
principal or interest is otherwise supported by U.S. Government obligations held
in a segregated account.

Custodial Receipts

       The Fund may acquire, subject to the limitations described herein,
custodial receipts that evidence ownership of future interest payments,
principal payments or both on certain U.S. Treasury notes or bonds in connection
with programs sponsored by banks and brokerage firms. Such notes and bonds are
held in custody by a bank on behalf of the owners of the receipts. These
custodial receipts are known by various names, including "Treasury Receipts"
("TRs"), "Treasury Investment Growth Receipts" ("TIGRs") and "Certificates of
Accrual on Treasury Securities" ("CATS"), and may not be treated as U.S.
Government securities.

Debt Securities Ratings
- -----------------------

Description of Commercial Paper Ratings

       Commercial paper rated within the "A" category (highest quality) by S&P
is issued by entities which have liquidity ratios which are adequate to meet
cash requirements. Long-term senior debt is rated A or better, although in some
cases credits within the "BBB" category may be allowed. The issuer has access to
at least two additional channels of borrowing. Basic earnings and cash flow have
an upward trend with allowance made for unusual circumstances. Typically, the
issuer's industry is well established and the issuer has a strong position
within the industry. The reliability and quality of management are unquestioned.
The relative strength or weakness of the above factors determines whether the
issuer's commercial paper is


                                       8
<PAGE>

rated A-1, A-2 or A-3. (Those A-1 issues determined to possess overwhelming 
safety characteristics are denoted with a plus (+) sign: A-1+.)

       The rating Prime is the highest commercial paper rating category assigned
by Moody's. Among the factors considered by Moody's in assigning ratings are the
following: evaluation of the management of the issuer; economic evaluation of
the issuer's industry or industries and an appraisal of speculative-type risks
which may be inherent in certain areas; evaluation of the issuer's products in
relation to competition and customer acceptance; liquidity; amount and quality
of long-term debt; trend of earnings over a period of 10 years; financial
management of obligations which may be present or may arise as a result of
public interest questions and preparations to meet such obligations. These
factors are all considered in determining whether the commercial paper is rated
Prime-1, Prime-2 or Prime-3.

Description of the Highest Corporate Bond and Debenture Ratings of S&P

       AAA: An obligation rated within the AAA category has the highest rating
assigned by S&P. Capacity to meet the financial commitment on the obligation is
extremely strong.

       AA: An obligation rated within the AA category differs from AAA issues
only in small degree. Capacity to meet the financial commitment on the
obligation is very strong.

Description of the Highest Corporate Bond and Debenture Ratings of Moody's

       Aaa: Bonds which are rated within the Aaa category are judged to be of
the best quality. Interest payments are protected by a large or exceptionally
stable margin and principal is secure. While the various protective elements are
likely to change, such changes as can be visualized are most unlikely to impair
the fundamentally strong position of such issues.

       Aa: Bonds which are rated within the Aa category are judged to be of high
quality by all standards. Together with the Aaa group they comprise what are
generally known as high grade bonds. They are rated lower than the best bonds
because margins of protection may not be as large as in Aaa securities or
fluctuation of protective elements may be of greater amplitude or there may be
other elements present which make the long term risks appear somewhat greater
than in Aaa securities.

                                       9
<PAGE>

        ADDITIONAL INFORMATION CONCERNING CERTAIN RISKS AND INVESTMENTS

       The following describes further certain investment practices that the
Fund may follow and is provided as a supplement to the discussion appearing in
the Fund's Prospectus.

Foreign Banks and Securities
- ----------------------------

       The Fund may elect to concentrate its investments in obligations of
domestic banks, including certain U.S. branches and agencies of foreign banks
and certain foreign branches of U.S. banks as described under "Money Market
Instruments," above. The fund expects that investment, if any, in such
obligations will consist principally of obligations which are issued by U.S.
branches and agencies of foreign banks for sale in the U.S., and the Investment
Manager believes that the risks described below are reduced in the case of such
bank obligations. The Fund also may invest up to 25% of its total assets in
obligations of foriegn banks located abroad and obligations of foreign branches
of domestic banks not having a guarantee of a U.S. bank.

       The Fund may invest up to 15% of its total assets in money market
instruments of issuers organized and located in Canada payable in U.S. dollars
as described in the Prospectus, subject to the issuer diversification and other
restrictions described in the Prospectus and Statement of Additional
Information. Securities of such issuers guaranteed as to principal and interest
by a U.S. parent and otherwise meeting applicable quality standards will not be
included for purposes of calculating the 15% limitation.

       Investing in foreign branches of U.S. banks, U.S. branches of foreign
banks, foreign branches of foreign banks and U.S. agencies of foreign banks may
involve risks. These risks may include future unfavorable political and economic
developments, possible withholding or confiscatory taxes, seizure of foreign
deposits, currency controls, interest limitations and other governmental
restrictions that might affect payment of principal or interest, and possible
difficulties pursuing or enforcing claims against banks located outside the U.S.
Additionally, foreign issuers are not generally subject to uniform accounting,
auditing and financial reporting standards or other regulatory requirements and
practices comparable to U.S. issuers, and there may be less public information
available about foreign banks and their branches and agencies.

Restricted Securities
- ---------------------

       The Fund's policy is to not make an investment in restricted securities,
including Rule 144A and other restricted securities, if as a result more than
50% of its total assets are invested in such securities, provided not more than
10% of its total assets are invested in non-Rule 144A restricted securities.
Securities may be resold pursuant to Rule 144A under certain circumstances only
to qualified institutional buyers as defined in the rule, and the markets and
trading practices for such securities are relatively new and still developing;
depending on the development of such markets, such Rule 144A Securities may be
deemed to be liquid as


                                       10
<PAGE>

determined by or in accordance with methods adopted by the Trustees. Under such
methods the following factors are considered, among others: the frequency of
trades and quotes for the security, the number of dealers and potential
purchasers in the market, marketmaking activity, and the nature of the security
and marketplace trades. The Trustees will periodically monitor the liquidity
determinations. Investments in Rule 144A Securities could have the effect of
increasing the level of the Fund's illiquidity to the extent that qualified
institutional buyers become, for a time, uninterested in purchasing such
securities. Also, the Fund may be adversely impacted by the possible illiquidity
and subjective valuation of such securities in the absence of a market for them.

Repurchase Agreements
- ---------------------

       The Fund may enter into repurchase agreements. Repurchase agreements
occur when the Fund acquires a security and the seller, which may be either (i)
a primary dealer in U.S. Government securities or (ii) an FDIC-insured bank
having gross assets in excess of $500 million, simultaneously commits to
repurchase it at an agreed-upon price on an agreed-upon date within a specified
number of days (usually not more than seven) from the date of purchase. The
repurchase price reflects the purchase price plus an agreed-upon market rate of
interest which is unrelated to the coupon rate or maturity of the acquired
security. The Fund will only enter into repurchase agreements involving U.S.
Government securities. Repurchase agreements could involve certain risks in the
event of default or insolvency of the other party, including possible delays or
restrictions upon the Fund's ability to dispose of the underlying securities.
Repurchase agreements will be limited to 30% of the Fund's net assets, except
that repurchase agreements extending for more than seven days when combined with
any other illiquid securities held by the Fund will be limited to 15% of the
Fund's net assets.

Securities Lending
- ------------------

       The Fund may lend portfolio securities with a value of up to 33 1/3% of
its total assets. The Fund will receive cash or cash equivalents (e.g., U.S.
Government obligations) as collateral in an amount equal to at least 100% of the
current market value of any loaned securities plus accrued interest. Collateral
received by the Fund will generally be held in the form tendered, although cash
may be invested in unaffiliated mutual funds with quality short-term portfolios,
securities issued or guaranteed by the U.S. Government or its agencies or
instrumentalities, repurchase agreements or other similar investments. The
investing of cash collateral received from loaning portfolio securities involves
leverage which magnifies the potential for gain or loss on monies invested and,
therefore, results in an increase in the volatility of the Fund's outstanding
securities. Such loans may be terminated at any time.

       The Fund will retain rights to dividends, interest or other
distributions, on the loaned securities. Voting rights pass with the lending,
although the Fund may call loans to vote proxies if desired. Should the borrower
of the securities fail financially, there is a risk of delay in recovery of the
securities or loss of rights in the collateral. Loans are made only to


                                       11
<PAGE>

borrowers which are deemed by the Investment Manager or its agents to be of good
financial standing.

When-Issued Securities
- ----------------------

       The Fund may purchase "when-issued" securities, which are traded on a
price or yield basis prior to actual issuance. Such purchases will be made only
to achieve the Fund's investment objective and not for leverage. The when-issued
trading period generally lasts from a few days to months, or over a year or
more; during this period dividends or interest on the securities are not
payable. A frequent form of when-issued trading occurs when corporate securities
to be created by a merger of companies are traded prior to the actual
consummation of the merger. Such transactions may involve a risk of loss if the
value of the securities falls below the price committed to prior to actual
issuance. The Trust's custodian will establish a segregated account when the
Fund purchases securities on a when-issued basis consisting of cash or liquid
securities equal to the amount of the when-issued commitments. Securities
transactions involving delayed deliveries or forward commitments are frequently
characterized as when-issued transactions and are similarly treated by the Fund.

Industry Classifications
- ------------------------

       In determining how much of the portfolio is invested in a given industry,
the following industry classifications are currently used. Securities issued by
foreign governments are excluded. Companies engaged in the business of financing
may be classified according to the industries of their parent or sponsor
companies, or industries that otherwise most affect such financing companies.
The Fund will invest more than 25% of its total assets in the Financial Services
industry. Issuers of asset-backed pools will be classified as separate
industries based on the nature of the underlying assets, such as mortgages and
credit card receivables. "Asset-backed--Mortgages" includes private pools of
nongovernment-backed mortgages. The industry concentration limitations do not
apply to bank money instruments, e.g. interest bearing negotiable certificates,
issued by the foreign branch of a domestic bank, if the domestic parent would be
unconditionally liable in the event that the foreign branch failed to pay on its
instruments for any reason.

<TABLE>
<S>                          <C>                            <C>
Aerospace                    Computer Software & Service    Food & Beverage       
Airline                      Conglomerate                   Forest Products       
Asset-backed--Mortgages      Consumer Goods & Services      Gaming & Lodging      
Asset-backed--Credit Card    Container                      Gas                   
  Receivables                Cosmetics                      Gas Transmission      
Automotive                   Diversified                    Grocery               
Automotive Parts             Drug                           Healthcare & Hospital 
Bank                         Electric                         Management          
Building                     Electric Equipment             Hospital Supply       
Business Service             Electronic Components          Hotel & Restaurant    
Cable                        Electronic Equipment           Insurance             
Capital Goods & Equipment    Entertainment                  Machinery             
Chemical                     Financial Service              Media                 
</TABLE>  

                                       12
<PAGE>

<TABLE>
<S>                          <C>                            <C>
Metal & Mining               Printing & Publishing          Telephone              
Office Equipment             Railroad                       Textile & Apparel      
Oil Production               Real Estate and Building       Tobacco                
Oil Refining & Marketing     Recreation                     Truckers               
Oil Service                  Retail Trade                   Trust Certificates--   
Paper Products               Savings & Loan                   Governmental Related 
Personal Care                Shipping & Transportation        Lending             
Photography                  Technology & Communications    
Plastics                     
</TABLE>


Computer-Related Risks
- ----------------------

       Many mutual funds and other companies that issue securities, as well as
government entities upon whom those mutual funds and companies depend, may be
adversely affected by computer systems (whether their own systems or systems of
their service providers) that do not properly process dates beginning with
January 1, 2000 and information related to those dates. The Investment Manager
currently is in the process of reviewing its internal computer systems as they
relate to the Fund, as well as the computer systems of those service providers
upon which the Fund relies, in order to obtain reasonable assurances that the
Fund will not experience a material adverse impact related to that problem. The
Fund does not currently anticipate that problem will have a material adverse
impact on its portfolio investments, taken as a whole. There can be no
assurances in that area, however, including the possibility that problem could
negatively affect the investment markets or the economy generally.


                       THE TRUST, THE FUND AND ITS SHARES

   
       The Fund was organized in 1985 as a separate series of State Street
Research Money Market Trust, a Massachusetts business trust. A "series" is a
separate pool of assets of the Trust which is separately managed and may have a
different investment objective and different investment policies from the
objective and policies of another series. The Trust currently is comprised of
one series: State Street Research Money Market Fund. The Trustees of the Trust
have authority to issue an unlimited number of shares of beneficial interest of
each separate series, $.001 par value per share. The Trustees also have
authority, without the necessity of a shareholder vote, to create any number of
new series or classes or to commence the public offering of shares of any
previously established series or classes. The Trustees have authorized shares of
the Fund to be issued in six classes: Class B(1) (introduced January 1, 1999),
Class B, Class C, Class E, Class S and Class T (introduced August 1, 1998).
Prior to November 1, 1997, the Fund's current Class C shares were designated as
Class D shares and the Fund's current Class S shares were designated as Class C
shares.
    

       Each share of each class of shares represents an identical legal interest
in the same portfolio of investments of the Fund, has the same rights and is
identical in all respects, except that Class B and Class C shares bear the
expenses of the deferred sales arrangement and any expenses (including the
higher service and distribution fees) resulting from such sales

   
This page supplemented January 1, 1999.
    

                                       13
<PAGE>

arrangement, and certain other incremental expenses related to a class. Each
class will have exclusive voting rights with respect to provisions of the Rule
12b-1 distribution plan pursuant to which the service and distribution fees, if
any, are paid. Although the legal rights of holders of each class of shares are
identical, it is likely that the different expenses borne by each class will
result in different net asset values and dividends. The different classes of
shares of the Fund also have different exchange privileges. Except for those
differences between classes of shares described above, in the Fund's Prospectus
and otherwise in this Statement of Additional Information, each share of the
Fund has equal dividend, redemption and liquidation rights with other shares of
the Fund, and when issued, is fully paid and nonassessable by the Fund.

       The rights of holders of shares may be modified by the Trustees at any
time, so long as such modifications do not have an adverse effect on the rights
of any shareholder. On any matter submitted to the shareholders, the holder of a
Fund share is entitled to one vote per share (with proportionate voting for
fractional shares) regardless of the relative net asset value thereof.

       Under the Master Trust Agreement, no annual or regular meeting of
shareholders is required. Thus, there ordinarily will be no shareholder meetings
unless required by the 1940 Act. Except as otherwise provided under the 1940
Act, the Board of Trustees will be a self-perpetuating body until fewer than
two-thirds of the Trustees serving as such are Trustees who were elected by
shareholders of the Trust. In the event less than a majority of the Trustees
serving as such were elected by shareholders of the Trust, a meeting of
shareholders will be called to elect Trustees. Under the Master Trust Agreement,
any Trustee may be removed by vote of two-thirds of the outstanding Trust
shares; holders of 10% or more of the outstanding shares of the Trust can
require that the Trustees call a meeting of shareholders for purposes of voting
on the removal of one or more Trustees. In connection with such meetings called
by shareholders, shareholders will be assisted in shareholder communications to
the extent required by applicable law.

       Under Massachusetts law, the shareholders of the Trust could, under
certain circumstances, be held personally liable for the obligations for the
Trust. However, the Master Trust Agreement of the Trust disclaims shareholder
liability for acts or obligations of the Trust and provides for indemnification
for all losses and expenses of any shareholder of the Fund held personally
liable for the obligations of the Trust. Thus, the risk of a shareholder
incurring financial loss on account of shareholder liability is limited to
circumstances in which the Fund would be unable to meet its obligations. The
Investment Manager believes that, in view of the above, the risk of personal
liability to shareholders is remote.

       The Fund is an "open-end" management investment company, and is a
"diversified company" as those terms are defined in the 1940 Act. The Fund also
intends to qualify as a "money market fund" within the meaning of Rule 2a-7
under the 1940 Act, which includes complying with the portfolio quality,
maturity and diversification requirements of that rule.

                                       14
<PAGE>

Pursuant to Rule 2a-7, compliance with the diversification requirements under
the rule constitutes meeting the definitional requirements of a diversified
company under the 1940 Act. Generally, a fund that intends to meet its
diversification requirements under Rule 2a-7 may not invest more than 5% of its
total assets in any one issuer, although this limit may be greater if the
securities are held for short periods, are guaranteed or are subject to certain
redemption or resale rights, and there is no limit on investments in U.S.
Government securities.




                                       15

<PAGE>

                              TRUSTEES AND OFFICERS

       The Trustees and principal officers of the Trust, their addresses, and
their principal occupations and positions with certain affiliates of the
Investment Manager are set forth below.

   
        +Bruce R. Bond, 100 Minuteman Road, Andover, MA 01810, serves as Trustee
of the Trust. He is 51. His principal occupation is President, Chief Executive
Officer and Director of PictureTel Corporation. His other principal business
affiliation is Director of WITCO Corporation, a specialty chemical company.
During the past five years, he has also served as Chief Executive Officer of ANS
Communications (the networking subsidiary of America Online, Inc.) and as an
executive of British Telecom.
    

       *+Dyann H. Kiessling, One Financial Center, Boston, MA 02111, serves as
Vice President of the Trust. She is 34. Her principal occupation is Vice
President of State Street Research & Management Company. Her principal
occupation during the past five years has been portfolio manager and fixed
income trader for State Street Research & Management Company.

       +Steve A. Garban, The Pennsylvania State University, 210 Old Main,
University Park, PA 16802, serves as Trustee of the Trust. He is 60. He is
retired and was formerly Senior Vice President for Finance and Operations and
Treasurer of The Pennsylvania State University.

       +Malcolm T. Hopkins, 14 Brookside Road, Biltmore Forest, Asheville, NC
28803, serves as Trustee of the Trust. He is 70. He is engaged principally in
private investments. Previously, he was Vice Chairman of the Board and Chief
Financial Officer of St. Regis Corp.

       *+John H. Kallis, One Financial Center, Boston, MA 02111, serves as Vice
President of the Trust. He is 57. His principal occupation is Senior Vice
President of State Street Research & Management Company. During the past five
years he has also served as portfolio manager for State Street Research &
Management Company.

       +Edward M. Lamont, Box 1234, Moores Hill Road, Syosset, NY 11791, serves
as Trustee of the Trust. He is 71. He is engaged principally in private
investments and civic affairs, and is an author of business history. Previously,
he was with an affiliate of J.P. Morgan & Co. in New York.

       +Robert A. Lawrence, Saltonstall & Co., 175 Federal Street, Boston, MA
02110, serves as Trustee of the Trust. He is 71. He is retired and was formerly
a Partner in Saltonstall & Co., a private investment firm.

- ---------------------
* or + See footnotes on page 18.

This page supplemented as of January 1, 1999.

                                       16

<PAGE>

       *+Gerard P. Maus, One Financial Center, Boston, MA 02111, serves as
Treasurer of the Trust. He is 47. His principal occupation is currently, and
during the past five years has been, Executive Vice President, Treasurer, Chief
Financial Officer and Director of State Street Research & Management Company.
Mr. Maus's other principal business affiliations include Executive Vice
President, Treasurer, Chief Financial Officer and Director of State Street
Research Investment Services, Inc. and Executive Vice President, Chief Financial
Officer, Administrative Officer and Director, GFM International Investors, Inc.

       *+Francis J. McNamara, III, One Financial Center, Boston, MA 02111,
serves as Secretary and General Counsel of the Trust. He is 42. His principal
occupation is Executive Vice President, General Counsel and Secretary of State
Street Research & Management Company. During the past five years he has also
served as Senior Vice President of State Street Research & Management Company,
Senior Vice President of State Street Research Investment Services, Inc. and as
Senior Vice President, General Counsel and Assistant Secretary of The Boston
Company, Inc., Boston Safe Deposit and Trust Company and The Boston Company
Advisors, Inc. Mr. McNamara's other principal business affiliations include
Executive Vice President, General Counsel and Clerk of State Street Research
Investment Services, Inc. and Executive Vice President and General Counsel, GFM
International Investors, Inc.

       +Dean O. Morton, 3200 Hillview Avenue, Palo Alto, CA 94304, serves as
Trustee of the Trust. He is 66. He is retired and was formerly Executive Vice
President, Chief Operating Officer and Director, Hewlett-Packard Company.

   
       +Susan M. Phillips, The George Washington University, 710 21st Street,
Suite 206, Washington, DC 20052, serves as Trustee of the Trust. She is 55. Her
principal occupation is currently Dean and Professor of Finance and
Administration, School of Business and Public Management, The George Washington
University. Previously, she was a member of the Board of Governors of the
Federal Reserve System and Chairman and Commissioner of the Commodity Futures
Trading Commission.
    

       +Toby Rosenblatt, 3409 Pacific Avenue, San Francisco, CA 94118, serves as
Trustee of the Trust. He is 60. His principal occupations during the past five
years have been President of The Glen Ellen Company, a private investment
company, and Vice President of Founders Investments Ltd.

- ---------------------
* or + See footnotes on page 18.

This page supplemented as of January 1, 1999.

                                       17

<PAGE>

       +Michael S. Scott Morton, Massachusetts Institute of Technology, 77
Massachusetts Avenue, Cambridge, MA 02139, serves as Trustee of the Trust. He is
60. His principal occupation during the past five years has been Jay W.
Forrester Professor of Management at Sloan School of Management, Massachusetts
Institute of Technology.

       *+Thomas A. Shively, One Financial Center, Boston, MA 02111, serves as
Vice President of the Trust. He is 44. His principal occupation is Executive
Vice President and Director of State Street Research & Management Company.
During the past five years he has also served as Senior Vice President of State
Street Research & Management Company. Mr. Shively's other principal business
affiliation is Director of State Street Research Investment Services, Inc.

       *+Ralph F. Verni, One Financial Center, Boston, MA 02111, serves as
Chairman of the Board, President, Chief Executive Officer and Trustee of the
Trust. He is 55. His principal occupation is currently, and during the past five
years has been, Chairman of the Board, President, Chief Executive Officer and
Director of State Street Research & Management Company. Mr. Verni's other
principal business affiliations include Chairman of the Board and Director of
State Street Research Investment Services, Inc. (and until February, 1996, prior
positions as President and Chief Executive Officer of that company), and
Chairman of the Board, President, Chief Executive Officer and Director of GFM
International Investors, Inc.


- ---------------------
*  These Trustees and/or officers are or may be deemed to be "interested
   persons" of the Trust under the 1940 Act because of their affiliations with
   the Fund's investment adviser.

+  Serves as a Trustee/Director and/or officer of one or more of the following
   investment companies, each of which has an advisory relationship with the
   Investment Manager or its parent, Metropolitan Life Insurance Company
   ("Metropolitan"): State Street Research Equity Trust, State Street Research
   Financial Trust, State Street Research Income Trust, State Street Research
   Money Market Trust, State Street Research Tax-Exempt Trust, State Street
   Research Capital Trust, State Street Research Exchange Trust, State Street
   Research Growth Trust, State Street Research Master Investment Trust, State
   Street Research Securities Trust, State Street Research Portfolios, Inc. and
   Metropolitan Series Fund, Inc.

                                       18

<PAGE>

       Ownership of 25% or more of a voting security is deemed "control" as
defined in the 1940 Act. So long as 25% of a class of shares is so owned, such
owners will be presumed to be in control of such class of shares for purposes of
voting on certain matters submitted to a vote of shareholders, such as any
Distribution Plan for a given class.

       As of April 30, 1998, the Trustees and principal officers of the Trust as
a group owned less than 1% of the Fund's outstanding Class E shares, and owned
no shares of the Fund's outstanding Class B, Class C, Class S or Class T shares.

       Also, as of April 30, 1998, the following persons or entities were the
record and/or beneficial owners of the approximate amounts of each class of
shares of the Fund as set forth beside their names:

<TABLE>
<CAPTION>
                   Shareholder                                      %
                   -----------                                     ---
<S>          <C>                                                  <C>
Class B      State Street Bank                                     9.1

Class C (a)  Metropolitan Life                                    33.4
             State Street Bank                                    23.8
             PaineWebber                                          11.8
             R.R. Berthier and T.O. Berthier, JT Ten               5.9

Class E      Metropolitan Life                                    21.3

Class S (a)  Chase Manhattan                                      48.2
             State Street Bank                                    33.6
</TABLE>

       The full name and address of each of the above persons or entities are as
follows:

Metropolitan Life Insurance Company (d)
One Madison Avenue
New York, NY  10010

State Street Bank and Trust Company (b) (e)
225 Franklin Street
Boston, MA  02110

The Chase Manhattan Bank (b)(c)
770 Broadway
New York, NY  10003


                                       19
<PAGE>

PaineWebber (b)(e)
P.O. Box 3321
Weehawken, NJ 07087

R.R. Berthier and T.O. Berthier JT Ten
c/o State Street Research Service Center
One Financial Center
Boston, MA 02111

- --------------------
(a) Prior to November 1, 1997, the Fund's current Class C shares were designated
    as Class D shares and the Fund's current Class S shares were designated as
    Class C shares.

(b) The Fund believes that such entity does not have beneficial ownership of
    such shares.

(c) The Chase Manhattan Bank holds such shares as trustee under certain employee
    benefit plans serviced by Metropolitan Life Insurance Company.

(d) Metropolitan, a New York corporation, was the record and/or beneficial
    owner, directly or indirectly through its subsidiaries or affiliates, of
    such shares.

(e) Includes shares owned by the indicated holder of record for the benefit of
    named owners who may separately own less than 5% of the share class.

    The Trustees were compensated as follows:

<TABLE>
<CAPTION>
- --------------------------------------------------------------------
                                                           Total
                                                       Compensation
                           Aggregate                  From Trust and
Name of                  Compensation                  Complex Paid
Trustee                  From Fund(a)                 to Trustees(b)
- --------------------------------------------------------------------
<S>                         <C>                          <C>     
Steve A. Garban*            $    0                       $ 34,750
Malcolm T. Hopkins*         $    0                       $ 34,750
Edward M. Lamont            $3,700                       $ 59,375
Robert A. Lawrence          $4,100                       $ 92,125
Dean O. Morton              $4,300                       $ 96,125
Toby Rosenblatt             $4,100                       $ 59,375
Michael S. Scott Morton     $4,600                       $100,325
Ralph F. Verni              $    0                       $      0
</TABLE>


*   Elected Trustee on March 31, 1998 and, therefore, did not earn any fees for
    the fiscal year ended March 31, 1998.

(a) For the Fund's fiscal year ended March 31, 1998.


                                       20
<PAGE>

(b) Includes compensation on behalf of all series of 12 investment companies for
    which the Investment Manager or its parent, Metropolitan, served as
    investment adviser. "Total Compensation from Trust and Complex Paid to
    Trustees" is for the 12 months ended December 31, 1997. The Trust does not
    provide any pension or retirement benefits for the Trustees.


             MANAGEMENT OF THE FUND AND INVESTMENT ADVISORY SERVICES

       Under the provisions of the Trust's Master Trust Agreement and the laws
of Massachusetts, responsibility for the management and supervision of the Fund
rests with the Trustees.

       State Street Research & Management Company, the Investment Manager, a
Delaware corporation, with offices at One Financial Center, Boston,
Massachusetts 02111-2690, acts as investment adviser to the Fund. The Investment
Manager was founded by Paul Cabot, Richard Saltonstall and Richard Paine to
serve as investment adviser to one of the nation's first mutual funds, presently
known as State Street Research Investment Trust, which they had formed in 1924.
Their investment management philosophy emphasized comprehensive fundamental
research and analysis, including meetings with the management of companies under
consideration for investment. The Investment Manager's portfolio management
group has extensive investment industry experience managing equity and debt
securities.

       The Investment Manager is charged with the overall responsibility for
managing the investments and business affairs of the Fund, subject to the
authority of the Board of Trustees. The Advisory Agreement provides that the
Investment Manager shall furnish the Fund with an investment program, office
facilities and such investment advisory, research and administrative services as
may be required from time to time. The Investment Manager compensates all
executive and clerical personnel and Trustees of the Trust if such persons are
employees of the Investment Manager or its affiliates. The Investment Manager is
an indirect, wholly owned subsidiary of Metropolitan.

       The advisory fee payable monthly by the Fund to the Investment Manager is
computed as a percentage of the average of the value of the net assets of the
Fund as determined at the close of regular trading on the New York Stock
Exchange (the "NYSE") on each day the NYSE is open for trading, at the annual
rate of 0.50% of the net assets of the Fund.

       The Distributor and its affiliates have from time to time and in varying
amounts voluntarily assumed some portion of fees or expenses relating to the
Fund. For the fiscal years ended March 31, 1996, 1997, and 1998 the Fund's
investment advisory fee prior to the assumption of fees or expenses was
$1,063,955, $1,152,723, and $1,219,931, respectively. For the same periods, the
voluntary reduction of fees or assumption of expenses amounted to $600,157,
$377,715, and $494,474, respectively.


                                       21
<PAGE>

         The Advisory Agreement provides that it shall continue in effect with
respect to the Fund for a period of two years after its initial effectiveness
and will continue from year to year thereafter as long as it is approved at
least annually both (i) by a vote of a majority of the outstanding voting
securities of the Fund (as defined in the 1940 Act) or by the Trustees of the
Trust, and (ii) in either event by a vote of a majority of the Trustees who are
not parties to the Advisory Agreement or "interested persons" of any party
thereto, cast in person at a meeting called for the purpose of voting on such
approval. The Advisory Agreement may be terminated on 60 days' written notice by
either party and will terminate automatically in the event of its assignment, as
defined under the 1940 Act and regulations thereunder. Such regulations provide
that a transaction which does not result in a change of actual control or
management of an adviser is not deemed an assignment.

         Under the Code of Ethics of the Investment Manager, investment
management personnel are only permitted to engage in personal securities
transactions in accordance with certain conditions relating to such person's
position, the identity of the security, the timing of the transaction, and
similar factors. Such personnel must report their personal securities
transactions quarterly and supply broker confirmations of such transactions to
the Investment Manager.


                        PURCHASE AND REDEMPTION OF SHARES

   
         Shares of the Fund are distributed by State Street Research Investment
Services, Inc. The Fund offers multiple classes of shares, which may be
purchased at the next determined net asset value per share plus, in the case of
all classes except Class E, Class S and Class T shares, a sales charge, which is
imposed on a deferred basis (the Class B(1), Class B and Class C shares).
General information on how to buy shares of the Fund, as well as sales charges
involved, are set forth under "Your Investment" in the Prospectus. The following
supplements that information.
    

         Purchase Orders. When a purchase order is placed through a dealer, that
dealer is responsible for transmitting the order promptly to the State Street
Research Service Center (the "Service Center") in order to permit the investor
to obtain the current price. Any loss suffered by an investor which results from
a dealer's failure to transmit an order promptly is a matter for settlement
between the investor and the dealer.

   
         Class B(1), Class B and Class C Shares. Class B(1), Class B and Class C
shares are offered solely in connection with exchanges from "Eligible Funds"
(which include the Fund and other funds as designated by the Distributor from
time to time).

         Conversion of Class B(1) and Class B Shares to Class E Shares. A
shareholder's Class B(1) and Class B shares of the Fund, including all shares
received as dividends or distributions with respect to such shares, will
automatically convert to Class E shares of the 

This page supplemented as of January 1, 1999.
    

                                       22
<PAGE>

   
Fund at the end of eight years following the issuance of such shares;
consequently, they will no longer be subject to the higher expenses borne by
Class B(1) and Class B shares. The conversion rate will be determined on the
basis of the relative per share net asset values of the two classes and may
result in a shareholder receiving either a greater or fewer number of Class E
shares than the shares so converted. As noted above, holding periods for Class
B(1) shares received in exchange for Class B(1) shares of other Eligible Funds
and for Class B shares received in exchange for Class B shares of other Eligible
Funds, will be counted toward the eight-year period.

         Contingent Deferred Sales Charges. The amount of any contingent
deferred sales charge paid on Class B(1), Class B or Class C shares of the Fund
will be paid to the Distributor. The Distributor will pay dealers at the time of
sale a 4% commission for selling Class B(1) shares and a 1% commission for
selling Class C shares. In certain cases, a dealer may elect to waive the 4%
commission on Class B(1) shares and receive in lieu thereof an annual fee,
usually 1% with respect to such outstanding shares. The proceeds of the
contingent deferred sales charges and the distribution fees are used to offset
distribution expenses and thereby permit the sale of Class B(1), Class B and
Class C shares without an initial sales charge.

       In determining the applicability and rate of any contingent deferred
sales charge of Class B(1), Class B or Class C shares, it will be assumed that a
redemption of the shares is made first of those shares having the greatest
capital appreciation, next of shares representing reinvestment of dividends and
capital gains distributions and finally of remaining shares held by the
shareholder for the longest period of time. Class B(1) shares that are redeemed
within a six-year period after their purchase, Class B shares that are redeemed
within a five-year period after their purchase, and Class C shares that are
redeemed within a one-year period after their purchase, will not be subject to a
contingent deferred sales charge to the extent that the value of such shares
represents (1) capital appreciation of Fund assets or (2) reinvestment of
dividends or capital gains distributions. The holding period for purposes of
applying a contingent deferred sales charge for a particular class of shares of
the Fund acquired through an exchange from another Eligible Fund will be
measured from the date that such shares were initially acquired in the other
Eligible Fund, and shares of the same class being redeemed will be considered to
represent, as applicable, capital appreciation or dividend and capital gains
distribution reinvestments in such other Eligible Fund. These determinations
will result in any contingent deferred sales charge being imposed at the lowest
possible rate. For federal income tax purposes, the amount of the contingent
deferred sales charge will reduce the gain or increase the loss, as the case may
be, on the amount realized on redemption.

       Contingent Deferred Sales Charge Waivers. With respect to Class B(1),
Class B and Class C shares of the Fund, the contingent deferred sales charge
does not apply to exchanges or to redemptions under a systematic withdrawal plan
which meets certain conditions. The contingent deferred sales charge will be
waived for participant initiated distributions from State Street Research
prototype employee retirement plans. In addition, the contingent 


This page supplemented as of January 1, 1999.
    

                                       23
<PAGE>

   
deferred sales charge will be waived for: (i) redemptions made within one year
of the death or total disability, as defined by the Social Security
Administration, of all shareholders of an account; (ii) redemptions made after
attainment of a specific age in an amount which represents the minimum
distribution required at such age under Section 401(a)(9) of the Internal
Revenue Code of 1986, as amended, for retirement accounts or plans (e.g., age 70
1/2 for Individual Retirement Accounts and Section 403(b) plans), calculated
solely on the basis of assets invested in the Fund or other Eligible Funds; and
(iii) a redemption resulting from a tax-free return of an excess contribution to
an Individual Retirement Account. (The foregoing waivers do not apply to a
tax-free rollover or transfer of assets out of the Fund). The Fund may modify or
terminate the waivers at any time; for example, the Fund may limit the
application of multiple waivers and establish other conditions for employee
benefit plans. Certain employee benefit plans sponsored by a financial
professional may be subject to other conditions for waivers under which the
plans may initially invest in Class B(1) or Class B shares and then Class A
shares of certain funds upon meeting specific criteria.
    

         Class E Shares. Class E shares may be issued directly or through
exchanges to certain shareholders of the Fund or other Eligible Funds who
previously held shares that are not subject to any future sales charge or
service fees or distribution fees.

         Class S Shares. Class S shares are currently available to certain
employee benefit plans such as qualified retirement plans which meet criteria
relating to number of participants, service arrangements, or similar factors;
insurance companies; investment companies; advisory accounts of the Investment
Manager; endowment funds of nonprofit organizations with substantial minimum
assets (currently a minimum of $10 million); and other similar institutional
investors. Class S shares may be acquired through programs or products sponsored
by Metropolitan, its affiliates, or both for which Class S shares have been
designated. In addition, Class S shares are available through programs under
which, for example, investors pay an asset-based fee and/or a transaction fee to
intermediaries. Class S share availability is determined by the Distributor and
intermediaries based on the overall direct and indirect costs of a particular
program, expected assets, account sizes and similar considerations.

         Class T Shares. MetLife Securities Money Fund Class T shares are for
accounts available through Metropolitan and its affiliates.

         Reorganizations. In the event of mergers or reorganizations with other
public or private collective investment entities, including investment companies
as defined in the 1940 Act, as amended, the Fund may issue its shares at net
asset value (or more) to such entities or to their security holders.

         Redemptions. The Fund reserves the right to pay redemptions in kind
with portfolio securities in lieu of cash. In accordance with its election
pursuant to Rule 18f-1 under the 1940 Act, the Fund may limit the amount of
redemption proceeds paid in cash. Although it 


   
This page supplemented as of January 1, 1999.
    

                                       24
<PAGE>

has no present intention to do so, the Fund may, under unusual circumstances,
limit redemptions in cash with respect to each shareholder during any ninety-day
period to the lesser of (i) $250,000 or (ii) 1% of the net asset value of the
Fund at the beginning of such period. In connection with any redemptions paid in
kind with portfolio securities, brokerage and other costs may be incurred by the
redeeming shareholder in the sale of the securities received.

   
         Systematic Withdrawal Plan. A shareholder who owns noncertificated
Class E or Class S shares with a value of $5,000 or more, or Class B(1), Class B
or Class C shares with a value of $10,000 or more, may elect, by participating
in the Fund's Systematic Withdrawal Plan, to have periodic checks issued for
specified amounts. These amounts may not be less than certain minimums,
depending on the class of shares held. The Plan provides that all income
dividends and capital gains distributions of the Fund shall be credited to
participating shareholders in additional shares of the Fund. Thus, the
withdrawal amounts paid can only be realized by redeeming shares of the Fund
under the Plan. To the extent such amounts paid exceed dividends and
distributions from the Fund, a shareholder's investment will decrease and may
eventually be exhausted.
    

         In the case of shares otherwise subject to contingent deferred sales
charges, no such charges will be imposed on withdrawals of up to 8% annually of
either (a) the value, at the time the Systematic Withdrawal Plan is initiated,
of the shares then in the account or (b) the value, at the time of a withdrawal,
of the same number of shares as in the account when the Systematic Withdrawal
Plan was initiated, whichever is higher.

         Expenses of the Systematic Withdrawal Plan are borne by the Fund. A
participating shareholder may withdraw from the Systematic Withdrawal Plan, and
the Fund may terminate the Systematic Withdrawal Plan at any time on written
notice. Purchase of additional shares while a shareholder is receiving payments
under a Systematic Withdrawal Plan is ordinarily disadvantageous because of
duplicative sales charges. For this reason, a shareholder may not participate in
the Investamatic Program (see "Your Investment--Investor Services--Investamatic
Program" in the Fund's Prospectus) and the Systematic Withdrawal Plan at the
same time.

         Request to Dealer to Repurchase. For the convenience of shareholders,
the Fund has authorized the Distributor as its agent to accept orders from
dealers by wire or telephone for the repurchase of shares by the Distributor
from the dealer. The Fund may revoke or suspend this authorization at any time.
The repurchase price is the net asset value for the applicable shares next
determined following the time at which the shares are offered for repurchase by
the dealer to the Distributor. The dealer is responsible for promptly
transmitting a shareholder's order to the Distributor.

         Signature Guarantees. Signature guarantees are required for, among
other things: (1) written requests for redemptions for more than $100,000; (2)
written requests for redemptions for any amount if the proceeds are transmitted
to other than the current address of record (unchanged in the past 30 days); (3)
written requests for redemptions for any amount submitted 


   
This page supplemented as of January 1, 1999.
    

                                       25
<PAGE>

by corporations and certain fiduciaries and other intermediaries; and (4)
requests to transfer the registration of shares to another owner. Signatures
must be guaranteed by a bank, a member firm of a national stock exchange, or
other eligible guarantor institution. The Transfer Agent will not accept
guarantees (or notarizations) from notaries public. The above requirements may
be waived in certain instances.

         Dishonored Checks. If a purchaser's check is not honored for its full
amount, the purchaser could be subject to additional charges to cover collection
costs and any investment loss, and the purchase may be canceled.

         Processing Charges. Purchases and redemptions processed through
securities dealers may be subject to processing charges imposed by the
securities dealer in addition to sales charges that may be imposed by the Fund
or the Distributor.


                              SHAREHOLDER ACCOUNTS

         General information on shareholder accounts is included in the Fund's
Prospectus under "Your Investment." The following supplements that information.

         Maintenance Fees and Involuntary Redemption. Because of the relatively
high cost of maintaining small shareholder accounts, the Fund reserves the right
to redeem at its option any shareholder account which remains below $1,500 for a
period of 60 days after notice is mailed to the applicable shareholder, or to
impose a maintenance fee on such account after 60-days' notice. Such
involuntarily redemptions will be subject to applicable sales charges, if any.
The Fund may increase such minimum account value above such amount in the future
after notice to affected shareholders. Involuntarily redeemed shares will be
priced at the net asset value on the date fixed for redemption by the Fund, and
the proceeds of the redemption will be mailed to the affected shareholder at the
address of record. Currently, the maintenance fee is $18 annually, which is paid
to the Transfer Agent. The fee does not apply to certain retirement accounts or
if the shareholder has more than an aggregate $50,000 invested in the Fund and
other Eligible Funds combined. Imposition of a maintenance fee on a small
account could, over time, exhaust the assets of such account.

         To cover the cost of additional compliance administration, a $20 fee
will be charged against any shareholder account that has been determined to be
subject to escheat under applicable state laws.

         The Fund may not suspend the right of redemption or postpone the date
of payment of redemption proceeds for more than seven days, except that (a) it
may elect to suspend the redemption of shares or postpone the date of payment of
redemption proceeds: (1) during any period that the NYSE is closed (other than
customary weekend and holiday closings) or trading on the NYSE is restricted;
(2) during any period in which an emergency exists as a result of which disposal
of portfolio securities is not reasonably practicable or it is not reasonably

                                       26
<PAGE>

practicable to fairly determine the Fund's net asset values; or (3) during such
other periods as the Securities and Exchange Commission (the "SEC") may by order
permit for the protection of investors; and (b) the payment of redemption
proceeds may be postponed as otherwise provided under "Purchase and Redemption
of Shares" in this Statement of Additional Information.

         The Open Account System. Under the Open Account System full and
fractional shares of the Fund owned by shareholders are credited to their
accounts by the Transfer Agent, State Street Bank and Trust Company, 225
Franklin Street, Boston, Massachusetts 02110. Share certificates will not be
issued. Shareholders will receive periodic statements of transactions in their
accounts.

         The Fund's Open Account System provides the following options:

         1.  Additional purchases of shares of the Fund may be made through
             dealers, by wire or by mailing a check payable to "State Street
             Research Funds" under the terms set forth above under "Purchase and
             Redemption of Shares" in this Statement of Additional Information.

         2.  The following methods of receiving dividends from investment income
             and distributions from capital gains generally are available:

             (a) All income dividends and capital gains distributions reinvested
                 in additional shares of the Fund.

             (b) All income dividends and capital gains distributions in cash.

             (c) All income dividends and capital gains distributions invested
                 in any one available Eligible Fund designated by the
                 shareholder as described below. See "--Dividend Allocation
                 Plan" herein.

         Dividend and distribution selections should be made on the Application
accompanying the initial investment. If no selection is indicated on the
Application, that account will be automatically coded for reinvestment of all
dividends and distributions in additional shares of the same class of the Fund.
Selections may be changed at any time by telephone or written notice to the
Service Center. Dividends and distributions are reinvested at net asset value
without a sales charge.

         Requests by Check. Shareholders of Class E shares of the Fund may
redeem shares by checks drawn on State Street Bank and Trust Company. Checks may
be made payable to the order of any person or organization designated by the
shareholder and must be for amounts of 


   
This page supplemented as of January 1, 1999.
    

                                       27
<PAGE>

at least $500. Shareholders will continue to earn dividends on the shares to be
redeemed until the check clears. There currently is no charge associated with
redemption of shares by check. Checkbooks are supplied for a $2 fee. Checks will
be sent only to the registered owner at the address of record. A $10 fee will be
charged against an account in the event a redemption check is presented for
payment and not honored pursuant to the terms and conditions established by
State Street Bank and Trust Company.

         Shareholders can request the checkwriting privilege by completing the
signature card, which is part of the application. In order to arrange for
redemption-by-check after an account has been opened, a revised application with
signature card and signatures guaranteed must be sent to the Service Center.
Canceled checks will be returned to shareholders at the end of each month.

         The redemption-by-check service is subject to State Street Bank and
Trust Company's rules and regulations applicable to checking accounts (as
amended from time to time), and is governed by the Massachusetts Uniform
Commercial Code. All notices with respect to checks drawn on State Street Bank
and Trust Company must be given to State Street Bank and Trust Company. Stop
payment instructions with respect to checks must be given to State Street Bank
and Trust Company by calling 1-617-985-8543.

   
         Exchange Privileges. Shareholders of the Fund may exchange their shares
for available shares with corresponding characteristics of any of the other
Eligible Funds at any time on the basis of the relative net asset values of the
respective shares to be exchanged, subject to compliance with applicable
securities laws. Shareholders of any other Eligible Fund may similarly exchange
their shares for Fund shares with corresponding characteristics. Prior to making
an exchange, shareholders should obtain the Prospectus of the Eligible Fund into
which they are exchanging. Under the Direct Program, subject to certain
conditions, shareholders may make arrangements for regular exchanges from the
Fund into other Eligible Funds. To effect an exchange, Class B(1), Class B and
Class C shares may be redeemed without the payment of any contingent deferred
sales charge that might otherwise be due upon an ordinary redemption of such
shares. Exchanges of Class E shares of the Fund into Class A shares of any other
Eligible Fund are subject to the initial sales charge or contingent deferred
sales charge applicable to an initial investment in such Class A shares, unless
a prior Class A sales charge has been paid directly or indirectly with respect
to the shares redeemed. For purposes of computing the contingent deferred sales
charge that may be payable upon disposition of any acquired Class A, Class B(1),
Class B and Class C shares, the holding period of the redeemed shares is
"tacked" to the holding period of any acquired shares. The period any Class E
shares are held is not tacked to the holding period of any acquired shares. No
exchange transaction fee is currently imposed on any exchange. Class T shares
may not be exchanged into shares of any other Eligible Fund, and no shares of
any other Eligible Fund may be exchanged into Class T shares.
    

         The exchange privilege may be terminated or suspended or its terms
changed at any time, subject, if required under applicable regulations, to 60
days' prior notice. New accounts


   
This page supplemented as of January 1, 1999.
    

                                       28
<PAGE>

established for investments upon exchange from an existing account in another
fund will have the same telephone privileges with respect to the Fund (see "Your
Investment--Account Policies--Telephone Requests" in the Fund's Prospectus and
"--Telephone Privileges," below) as the existing account unless the Service
Center is instructed otherwise. Related administrative policies and procedures
may also be adopted with regard to a series of exchanges, street name accounts,
sponsored arrangements and other matters.

         Reinvestment Privilege. A shareholder of the Fund who has redeemed
shares or had shares repurchased at his or her request may reinvest all or any
portion of the proceeds (plus that amount necessary to acquire a fractional
share to round off his or her reinvestment to full shares) in shares, of the
same class as the shares redeemed, of the Fund or any other Eligible Fund at net
asset value and without subjecting the reinvestment to an initial sales charge,
provided such reinvestment is made within 120 calendar days after a redemption
or repurchase. Upon such reinvestment, the shareholder will be credited with any
contingent deferred sales charge previously charged with respect to the amount
reinvested. The redemption of shares is, for federal income tax purposes, a sale
on which the shareholder may realize a gain or loss. If a redemption at a loss
is followed by a reinvestment within 30 days, the transaction may be a "wash
sale" resulting in a denial of the loss for federal income tax purposes.

         Any reinvestment pursuant to the reinvestment privilege will be subject
to any applicable minimum account standards imposed by the fund into which the
reinvestment is made. Shares are sold to a reinvesting shareholder at the net
asset value thereof next determined following timely receipt by the Service
Center of such shareholder's written purchase request and delivery of the
request by the Service Center to the Transfer Agent. A shareholder may exercise
this reinvestment privilege only once per 12-month period with respect to his or
her shares of the Fund.

         Dividend Allocation Plan. The Dividend Allocation Plan allows
shareholders to elect to have all their dividends and any other distributions
from the Fund or any Eligible Fund automatically invested at net asset value in
one other such Eligible Fund designated by the shareholder, provided the account
into which the dividends and distributions are directed is initially funded with
the requisite minimum amount.

         Telephone Privileges. A shareholder with telephone privileges that are
offered with his or her Account (see "Your Investment--Account Policies--
Telephone Requests") is deemed to authorize the Service Center and the Transfer
Agent to: (1) act upon the telephone instructions of any person purporting to be
the shareholder or the shareholder's financial professional to redeem or
exchange, shares from any account; and (2) honor any written instructions for a
change of address regardless of whether such request is accompanied by a
signature guarantee. All telephone calls will be recorded. Neither the Fund, the
other Eligible Funds, the Transfer Agent, the Investment Manager nor the
Distributor will be liable for any loss, expense or cost arising out of any
request, including any fraudulent or unauthorized requests. Shareholders assume
the risk to the full extent of their accounts that telephone requests may be
unauthorized. 


                                       29
<PAGE>

Reasonable procedures will be followed to confirm that instructions communicated
by telephone are genuine. The shareholder will not be liable for any losses
arising from unauthorized or fraudulent instructions if such procedures are not
followed.

         Alternative Means of Contacting the Fund. It is unlikely, during
periods of extraordinary market conditions, that a shareholder may have
difficulty in reaching the Service Center. In that event, however, the
shareholder should contact the Service Center at 1-800-562-0032, 1-617-357-7800
or otherwise at its main office at One Financial Center, Boston, Massachusetts
02111-2690.


                                NET ASSET VALUE

         Securities held by the Fund are valued on the basis of amortized cost,
which involves a constant amortization of premium or accretion of discount to
maturity regardless of the impact of fluctuating interest rates on the market
value of the security. While this method provides certainty in valuation, it may
result in periods in which the value as determined by amortized cost is higher
or lower than the price the Fund would receive if it sold the security. On each
day that the NYSE is open for unrestricted trading, the net asset value of the
shares of the Fund is determined as of 12 noon and the close of regular trading
on the NYSE, which is ordinarily 4 P.M. New York City time. The NYSE is
currently closed on New Year's Day, Martin Luther King, Jr., Day, Presidents
Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day
and Christmas Day.

         The Fund anticipates that under ordinary and usual circumstances it
will be able to maintain a constant net asset value of $1.00 per share and the
Fund will use its best efforts to do so. However, such maintenance at $1.00
might not be possible if (1) there are changes in short-term interest rates or
other factors such as unfavorable changes in the credit of issuers affecting the
values of the securities held by the Fund and the Fund is compelled to sell such
securities at a time when the prices which it is able to realize vary
significantly from the values determined on the amortized cost basis or (2) the
Fund should have negative net income. It is expected that the Fund will have
positive net income at the time of each determination thereof. If for any reason
the net income of the Fund is negative, the Fund will first offset the negative
amount with respect to each shareholder account against the dividends which
accrued during the month with respect to each such account. If and to the extent
that such negative amount exceeds such accrued dividends at the end of the month
(or at any earlier time when redemption by the shareholder would reduce the net
asset value of the shares of the Fund in his account to less than the excess of
such negative account over accrued dividends), the Fund will reduce the number
of its outstanding shares by treating the shareholder as having contributed to
the capital of the Fund that number of shares of the Fund in the account of such
shareholder which represents the amount of such excess. Each shareholder will be
deemed to have agreed to such contributions in these circumstances by his
investment in the Fund.

                                       30
<PAGE>

         The utilization of the amortized cost method of valuation requires
compliance with the requirements of Rule 2a-7 under the 1940 Act. Such
compliance requires, among other things, the following:

         (1)  The Trustees must adopt procedures whereby the extent of
              deviation, if any, of the current net asset value per share
              calculated using available market quotations (or an appropriate
              substitute which reflects current market conditions) from the
              Fund's net asset value per share under the amortized cost
              valuation method will be determined at such intervals as the
              Trustees deem appropriate and reasonable in light of current
              market conditions, and the Trustees must review periodically the
              amount of the deviation as well as the methods used to calculate
              the deviation;

         (2)  In the event such deviation from the Fund's net asset value under
              the amortized cost valuation method exceeds 1/2 of 1%, the
              Trustees must promptly consider what action should be initiated by
              them, and when the Trustees believe the extent of any deviation
              from the Fund's net asset value per share under the amortized cost
              valuation method may result in material dilution or any other
              unfair results to investors or existing shareholders, they must
              take such action as they deem appropriate to eliminate or reduce
              to the extent reasonably practicable such dilution or unfair
              results (shareholders will be notified in the event any such
              corrective action is taken by the Trustees);

         (3)  The Fund may not purchase any instrument with a remaining maturity
              greater than 397 calendar days or maintain a dollar-weighted
              average portfolio maturity which exceeds 90 days;

         (4)  The Fund must limit its portfolio investments, including
              repurchase agreements, to those United States dollar-denominated
              instruments which the Trustees determine present minimal credit
              risks and which are "eligible securities" as defined in Rule 2a-7;
              and

         (5)  The Fund must record, maintain and preserve certain records and
              observe certain reporting obligations in accordance with Rule
              2a-7.


                             PORTFOLIO TRANSACTIONS

Portfolio Turnover
- ------------------

         The Fund's portfolio turnover rate is determined by dividing the lesser
of securities purchases or sales for a year by the monthly average value of
securities held by the Fund (excluding, for purposes of this determination,
securities the maturities of which as of the time of their acquisition were one
year or less). Because the Fund only invests in securities


                                       31
<PAGE>

with remaining maturities of 397 calendar days or less, virtually all of which
are excludable in determining the rate of portfolio turnover, the portfolio
turnover rate for the Fund's two most recent fiscal year ends has been zero.

Brokerage Allocation
- --------------------

         The Investment Manager's policy is to seek for its clients, including
the Fund, what in the Investment Manager's judgment will be the best overall
execution of purchase or sale orders and the most favorable net prices in
securities transactions consistent with its judgment as to the business
qualifications of the various broker or dealer firms with whom the Investment
Manager may do business, and the Investment Manager may not necessarily choose
the broker offering the lowest available commission rate. Decisions with respect
to the market where the transaction is to be completed, to the form of
transaction (whether principal or agency), and to the allocation of orders among
brokers or dealers are made in accordance with this policy. In selecting brokers
or dealers to effect portfolio transactions, consideration is given to their
proven integrity and financial responsibility, their demonstrated execution
experience and capabilities both generally and with respect to particular
markets or securities, the competitiveness of their commission rates in agency
transactions (and their net prices in principal transactions), their willingness
to commit capital, and their clearance and settlement capability. The Investment
Manager makes every effort to keep informed of commission rate structures and
prevalent bid/ask spread characteristics of the markets and securities in which
transactions for the Fund occur. Against this background, the Investment Manager
evaluates the reasonableness of a commission or a net price with respect to a
particular transaction by considering such factors as difficulty of execution or
security positioning by the executing firm. The Investment Manager may or may
not solicit competitive bids based on its judgment of the expected benefit or
harm to the execution process for that transaction.

         When it appears that a number of firms could satisfy the required
standards in respect of a particular transaction, consideration may also be
given by the Investment Manager to services other than execution services which
certain of such firms have provided in the past or may provide in the future.
Negotiated commission rates and prices, however, are based upon the Investment
Manager's judgment of the rate which reflects the execution requirements of the
transaction without regard to whether the broker provides services in addition
to execution. Among such other services are the supplying of supplemental
investment research; general economic, political and business information;
analytical and statistical data; relevant market information, quotation
equipment and services; reports and information about specific companies,
industries and securities; purchase and sale recommendations for stocks and
bonds; portfolio strategy services; historical statistical information; market
data services providing information on specific issues and prices; financial
publications; proxy voting data and analysis services; technical analysis of
various aspects of the securities markets, including technical charts; computer
hardware used for brokerage and research purposes; computer software and
databases (including those used for portfolio analysis and modeling in
conjunction with certain trading systems and including software providing
investment personnel with efficient access to current and historical data from a
variety of internal and external sources); portfolio evaluation

                                       32
<PAGE>

services and relative performance of accounts. Certain of the nonexecution
services provided by broker-dealers may in turn be obtained by the
broker-dealers from third parties who are paid for such services by the
broker-dealers.

         In the case of the Fund and other registered investment companies
advised by the Investment Manager or its affiliates, the above services may
include data relating to performance, expenses and fees of those investment
companies and other investment companies; this information is used by the
Trustees or Directors of the investment companies to fulfill their
responsibility to oversee the quality of the Investment Manager's advisory
contracts between the investment companies and the Investment Manager. The
Investment Manager considers these investment company services only in
connection with the execution of transactions on behalf of its investment
company clients and not its other clients.

         The Investment Manager regularly reviews and evaluates the services
furnished by broker-dealers. Among other measures, the Investment Manager's
investment management personnel conducts internal surveys and uses other methods
to evaluate the quality of research and other services provided by broker-dealer
firms, and the results of those efforts are made available to the equity trading
department, which sometimes uses this information as a consideration to the
extent described above in the selection of brokers to execute portfolio
transactions.

         Some services furnished by broker-dealers may be used for research and
investment decision-making purposes, and also for marketing or administrative
purposes. Under these circumstances, the Investment Manager allocates the cost
of such services to determine the proportion that is allocable to research or
investment decision-making and the proportion that is allocable to other
purposes. The Investment Manager pays directly from its own funds for that
portion that is allocable to uses other than research or investment making
decision. Some research and execution services may benefit the Investment
Manager's clients as a whole, while others may benefit a specific segment of
clients. Not all such services will necessarily be used exclusively in
connection with the accounts which pay the commissions to the broker-dealer
producing the services.

         The Investment Manager has no fixed agreements or understandings with
any broker-dealer as to the amount of brokerage business which the firm may
expect to receive for services supplied to the Investment Manager or otherwise.
There may be, however, understandings with certain firms that in order for such
firms to be able to continuously supply certain services, they need to receive
an allocation of a specified amount of brokerage business. These understandings
are honored to the extent possible in accordance with the policies set forth
above.

         It is not the Investment Manager's policy to intentionally pay a firm a
brokerage commission higher than that which another firm would charge for
handling the same transaction in recognition of services (other than execution
services) provided. However, the

                                       33
<PAGE>

Investment Manager is aware that this is an area where differences of opinion as
to fact and circumstances may exist, and in such circumstances, if any, the
Investment Manager relies on the provisions of Section 28(e) of the Securities
Exchange Act of 1934. During the fiscal years ended March 31, 1996, 1997 and
1998, the Fund paid in secondary trading no brokerage commissions in secondary
trading. During and at the end of its most recent fiscal year, the Fund held in
its portfolio no securities of any entity that might be deemed to be a regular
broker-dealer of the Fund as defined under the 1940 Act.

         In the case of the purchase of fixed income securities in underwriting
transactions, the Investment Manager follows any instructions received from its
clients as to the allocation of new issue discounts, selling commissions and
designations to brokers or dealers which provide the client with research,
performance evaluation, master trustee and other services. In the absence of
instructions from the client, the Investment Manager may make such allocations
to broker-dealers which have provided the Investment Manager with research and
brokerage services.

         In some instances, certain clients of the Investment Manager request
that it place all or part of the orders for their account with certain brokers
or dealers, which in some cases provide services to those clients. The
Investment Manager generally agrees to honor those requests to the extent
practicable. Clients may condition their requests by requiring the Investment
Manager only to effect transactions with the specified broker-dealers if the
broker-dealers are competitive as to price and execution. In other cases, the
Investment Manager may be unable to negotiate commissions or obtain volume
discounts or best execution. In addition, a disparity may exist among the
commissions charged to clients who request the Investment Manager to use
particular brokers or dealers, and also between those clients and those who do
not make such requests. A client who requests the use of a particular
broker-dealer should understand that it may lose the possible advantage which
non-requesting clients derive from understandings with certain firms that in
order for such firms to be able to continuously supply certain services, they
need to receive an allocation of a specified amount of brokerage business. These
understandings are honored to the extent possible in accordance with the
policies set forth above.

         When more than one client of the Investment Manager is seeking to buy
or sell the same security, the sale or purchase is carried out in a manner which
is considered fair and equitable to all accounts. In allocating investments
among various clients (including in what sequence orders for trades are placed),
the Investment Manager will use its best business judgment and will take into
account such factors as the investment objectives of the clients, the amount of
investment funds available to each, the size of the order, the amount already
committed for each client to a specific investment and the relative risks of the
investments, all in order to provide on balance a fair and equitable result to
each client over time. Although sharing in large transactions may sometimes
affect price or volume of shares acquired or sold, overall it is believed there
may be an advantage in execution. The Investment Manager may follow the practice
of grouping orders of various clients for execution to get the benefit of
lower prices or commission rates. In certain cases where the aggregate order may
be executed 

                                       34
<PAGE>

in a series of transactions at various prices, the transactions are allocated as
to amount and price in a manner considered equitable to each so that each
receives, to the extent practicable, the average price of such transactions.
Exceptions may be made based on such factors as the size of the account and the
size of the trade. For example, the Investment Manager may not aggregate trades
where it believes that it is in the best interests of clients not to do so,
including situations where aggregation might result in a large number of small
transactions with consequent increased custodial and other transactional costs
which may disproportionately impact smaller accounts. Such disaggregation,
depending on the circumstances, may or may not result in such accounts receiving
more or less favorable execution relative to other clients.


                               CERTAIN TAX MATTERS

Taxation of the Fund--In General
- --------------------------------

         The Fund intends to qualify and elect to be treated each taxable year
as a "regulated investment company" under Subchapter M of the Internal Revenue
Code of 1986, as amended (the "Code"), although it cannot give complete
assurance that it will qualify to do so. Accordingly, the Fund must, among other
things, (a) derive at least 90% of its gross income in each taxable year from
dividends, interest, payments with respect to securities loans, gains from the
sale or other disposition of stock, securities or foreign currencies, or other
income (including, but not limited to, gains from options, futures or forward
contracts) derived with respect to its business of investing in such stock,
securities or currencies (the "90% test"); and (b) satisfy certain
diversification requirements on a quarterly basis; and (d) in order to be
entitled to utilize the dividends paid deduction, distribute annually at least
90% of its investment company taxable income (determined without regard to the
deduction for dividends paid).

         If the Fund should fail to qualify as a regulated investment company in
any year, it would lose the beneficial tax treatment accorded regulated
investment companies under Subchapter M of the Code and all of its taxable
income would be subject to tax at regular corporate rates without any deduction
for distributions to shareholders and such distributions will be taxable to
shareholders as ordinary income to the extent of the Fund's current or
accumulated earnings and profits. Also, the shareholders, if they received a
distribution in excess of current or accumulated earnings and profits, would
receive a return of capital that would reduce the basis of their shares of the
Fund.

         The Fund will be liable for a nondeductible 4% excise tax on amounts
not distributed (or deemed distributed) on a timely basis in accordance with a
calendar year distribution requirement. To avoid the tax, during each calendar
year the Fund must distribute, or be deemed to have distributed, an amount equal
to the sum of (1) at least 98% of its ordinary income (not taking into account
any capital gains or losses) for the calendar year, (2) at least 98% of its
capital gains in excess of its capital losses (adjusted for certain
extraordinary losses) for the 12-month period ending on October 31 of the
calendar year and (3) all ordinary income

                                       35
<PAGE>

and capital gains for previous years that were not distributed during such
years. For this purpose, any income or gain retained by the Fund that is subject
to corporate tax will be considered to have been distributed by year-end. The
Fund intends to make sufficient distributions to avoid this 4% excise tax.

Taxation of the Fund's Shareholders
- -----------------------------------

         Dividends paid by the Fund from taxable net investment income and
distributions of any net short-term capital gains, whether paid in cash or
reinvested in additional shares, will be taxable for federal income tax purposes
to shareholders as ordinary income. Distributions of net capital gains, if any,
which are designated as capital gains distributions, whether paid in cash or
reinvested in additional shares, will be taxable for federal income tax purposes
to shareholders as capital gains, regardless of how long shareholders have held
their shares.

         The foregoing discussion of United States federal income tax law
relates solely to the application of that law to United States persons, that is,
United States citizens and residents and United States corporations,
partnerships, trusts and estates. Each shareholder who is not a United States
person should consider the United States and foreign tax consequences of
ownership of shares of the Fund, including the possibility that such a
shareholder may be subject to United States withholding tax at a rate of up to
30% (or at a lower rate under an applicable treaty) on distributions from the
Fund.

         Shareholders should consult their tax advisers about the application of
the provisions of tax law described in this Statement of Additional Information
in light of their particular tax situations.


                                       36

<PAGE>

                       DISTRIBUTION OF SHARES OF THE FUND

   
         The Trust has entered into a Distribution Agreement with State Street
Research Investment Services, Inc., as Distributor, whereby the Distributor acts
as agent to sell and distribute shares of the Fund. Shares of the Fund are sold
through dealers who have entered into sales agreements with the Distributor. The
Distributor distributes shares of the Fund on a continuous basis at an offering
price which is based on the net asset value per share of the Fund plus a sales
charge which is imposed on a deferred basis (the Class B(1), Class B and Class C
shares). The Distributor may allow all or portions of such sales charges as
concessions to dealers. The Distributor may also pay its affiliate MetLife
Securities, Inc. additional sales compensation of up to 0.25% of certain sales.
    

         For the periods shown below, the Distributor received contingent
deferred sales charges upon redemption of Class B and Class C shares of the Fund
and paid initial commissions to securities dealers for sales of such Class B and
Class C shares as follows:

<TABLE>
<CAPTION>
                Fiscal Year Ended          Fiscal Year Ended         Fiscal Year Ended
                 March 31, 1998             March 31, 1997            March 31, 1996
                 --------------             --------------            --------------
            Contingent   Commissions  Contingent   Commissions   Contingent   Commissions
             Deferred      Paid to     Deferred      Paid to       Deferred     Paid to
           Sales Charges   Dealers  Sales Charges    Dealers    Sales Charges   Dealers
           -------------   -------  -------------    -------    -------------   -------
<S>          <C>           <C>        <C>           <C>           <C>           <C>    
Class B      $185,067      $15,662    $200,580      $ 13,752      $226,763      $13,749
Class C*     $  6,967      $   814    $ 22,159      $  3,502      $      0      $   198
</TABLE>

* Prior to November 1, 1997, the Fund's current Class C shares were designated
  as Class D shares and the Fund's current Class S shares were designated as 
  Class C shares.

       For information on the amount of distribution fees paid by the Fund to
the Distributor, see below.

   
       The Fund has adopted a "Plan of Distribution Pursuant to Rule 12b-1" (the
"Class A/B/C Distribution Plan") under which the Fund may engage, directly or
indirectly, in financing any activities primarily intended to result in the sale
of Class B(1), Class B and Class C shares, including, but not limited to, (1)
the payment of commissions and/or reimbursement to underwriters, securities
dealers and others engaged in the sale of shares, including payments to the
Distributor to be used to pay commissions and/or reimbursement to securities
dealers (which securities dealers may be affiliates of the Distributor) engaged
in the distribution and marketing of shares and furnishing ongoing assistance to
investors, (2) reimbursement of direct out-of-pocket expenditures incurred by
the Distributor in connection with the distribution and marketing of shares and
the servicing of investor accounts , and (3) reimbursement of expenses incurred
by the Distributor in connection with the servicing of shareholder accounts
including payments to securities dealers and others in consideration of the

This page supplemented as of January 1, 1999.
    


                                       37
<PAGE>

   
provision of personal services to investors and/or the maintenance or servicing
of shareholder accounts. In addition, the Class A/B/C Distribution Plan is
deemed to authorize the Distributor and the Investment Manager to make payments
out of general profits, revenues or other sources to underwriters, securities
dealers and others in connection with sales of shares, to the extent, if any,
that such payments may be deemed to be within the scope of Rule 12b-1 under the
1940 Act.

       The expenditures to be made pursuant to the Class A/B/C Distribution Plan
may not exceed with respect to Class B(1), Class B and Class C shares, an annual
rate of 0.75% of the average daily value of the net assets represented by such
Class B or Class C shares (as the case may be) to finance sales or promotion
expenses and an annual rate of 0.25% of the average daily value of the net
assets represented by such Class B or Class C shares (as the case may be) to
make payments for personal services and/or the maintenance or servicing of
shareholder accounts.

       The Fund also has adopted a Rule 12b-1 Plan for Class B(1) shares (the
"Class B(1) Distribution Plan") under which the Fund shall pay the Distributor
(a) a service fee at the end of each month at the annual rate of 0.25% of
average daily net assets attributable to the Class B(1) shares to compensate the
Distributor and any securities firms or other third parties who render personal
services to and/or maintain shareholder accounts for the shareholders of the
respective class and (b) a distribution fee under the Class B(1) Distribution
Plan at the end of each month at the annual rate of 0.75% of average daily net
assets attributable to the Class B(1) shares to compensate the Distributor for
services provided and expenses incurred by it in connection with sales,
promotional and marketing activities relating to the respective class. To the
extent that any payments made by the Fund to the Distributor or the Investment
Manager, including payment of investment management fees, should be deemed to be
an indirect financing of any activity primarily resulting in the sale of shares
of the Fund within the scope of Rule 12b-1 under the 1940 Act, then such
payments shall be deemed to be authorized by the Class B(1) Distribution Plan.

       A rule of the National Association of Securities Dealers, Inc. ("NASD")
limits annual expenditures that the Fund may incur to 0.75% for distribution
expenses and 0.25% for service fees. The NASD rule also limits the aggregate
amount that the Fund may pay for such distribution costs to 6.25% of gross share
sales of a class since the inception of any asset-based sales charge plus
interest at the prime rate plus 1% thereof (less any contingent deferred sales
charges). Such limitation does not apply to shareholder service fees. Payments
to the Distributor or to dealers funded under the Distribution Plan may be
discontinued at any time.
    

       Some or all of the service fees are used to pay or reimburse dealers
(including dealers that are affiliates of the Distributor) or others for
personal services and/or the maintenance of shareholder accounts. A portion of
any initial commission paid to dealers for the sale of shares 


This page supplemented as of January 1, 1999.

                                       38
<PAGE>

   
of the Fund represents payment for personal services and/or the maintenance or
servicing of shareholder accounts by such dealers. Dealers who have sold Class
B(1), Class B and Class C shares are eligible for further reimbursement after
the first year during which such shares have been held of record by such dealer
as nominee for its clients (or by such clients directly).

       The distribution fees are used primarily to offset initial and ongoing
commissions paid to dealers for selling such shares and for other sales and
marketing expenditures.
    

       The Distributor provides distribution services on behalf of other funds
having distribution plans and receives similar payments from, and incurs similar
expenses on behalf of, such other funds. When expenses of the Distributor cannot
be identified as relating to a specific fund, the Distributor allocates expenses
among the funds in a manner deemed fair and equitable to each fund.

   
       The payment of service and distribution fees may continue even if the
Fund ceases, temporarily or permanently, to sell one or more classes of shares
to new accounts. During the period the Fund is closed to new accounts, the
distribution fee will not be used for promotion expenses. The service and
distribution fees are used during a closed period to cover services provided to
current shareholders and to cover the compensation of financial professionals in
connection with the prior sale of Fund shares, among other non-promotional
distribution expenditures.
    

       The Distributor may pay certain dealers and other intermediaries
additional compensation for sales and administrative services. The Distributor
may provide cash and noncash incentives to intermediaries who, for example, sell
significant amounts of shares or develop particular distribution channels. The
Distributor may compensate dealers with clients who maintain their investments
in the Fund over a period of years. The incentives can include merchandise and
trips to, and attendance at, sales seminars at resorts. The Distributor may pay
for administrative services, such as technological and computer systems support
for the maintenance of pension plan participant records, for subaccounting, and
for distribution through mutual fund supermarkets or similar arrangements.

       During the fiscal year ended March 31, 1998, the Fund paid the
Distributor fees under the Distribution Plan and the Distributor used all of
such payments for expenses incurred on behalf of the Fund as follows:


This page supplemented as of January 1, 1999.

                                       39
<PAGE>

   
<TABLE>
<CAPTION>
                                          Class B               Class C**
                                          -------               ---------

<S>                                      <C>                    <C>     
Advertising                              $ 36,011               $  2,221

Printing and mailing of prospectuses to     9,188                    567
  other than current shareholders
                                           41,359                  4,716
Compensation to dealers

Compensation to sales personnel            29,596                  1,825

Interest                                        0                      0

Carrying or other financing charges             0                      0

Other expenses:  marketing; general        34,160                  1,700
                                         --------               --------

Total fees received                      $151,763               $ 11,029
                                         --------               --------
Difference                               $  1,449*
                                         =======
</TABLE>
    

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

*  Net fees result from the timing of expenditures and are used against future
   expenses. 

** Prior to November 1, 1997, the Fund's current Class C shares were designated
   as Class D shares.

       The Distributor may have also used additional resources of its own for
further expenses on behalf of the Fund.

       No interested Trustee of the Trust has any direct or indirect financial
interest in the operation of the Distribution Plan or any related agreements
thereunder. The Distributor's interest in the Distribution Plan is described
above.

       To the extent that the Glass-Steagall Act may be interpreted as
prohibiting banks and other depository institutions from being paid for
performing services under the Distribution Plan, the Fund will make alternative
arrangements for such services for shareholders who acquired shares through such
institutions.


                         CALCULATION OF PERFORMANCE DATA

       From time to time, in advertisements or in communications to shareholders
or prospective investors, the Fund may compare the performance of its Class B,
Class C, Class E, Class S or Class T shares to the performance of other mutual
funds with similar investment objectives, to certificates of deposit and/or to
other financial alternatives. The Fund may also

                                       40
<PAGE>

compare its performance to appropriate indices, such as the Consumer Price Index
and/or to appropriate rankings and averages such as those compiled by Lipper
Analytical Services, Inc. for the Money Market Instrument Fund category or those
complied by Morningstar, Inc., Money Magazine, Business Week, Forbes Magazine,
The Wall Street Journal, Fortune Magazine, Investor's Daily or Donoghue's Money
Fund Report.

       The average annual total return ("standard total return") of the Class B,
Class C, Class E, Class S and Class T shares of the Fund will be calculated as
set forth below. Total return is computed separately for each class of shares of
the Fund. Performance data for a specified class includes periods prior to the
adoption of class designations on June 1, 1993, when designations were assigned
based on the pricing and Rule 12b-1 fees applicable to shares sold thereafter.
The application of the additional Rule 12b-1 fees, if any, of up to 1% will, for
periods after June 1, 1993, adversely affect Fund performance results. Thus,
performance data or rankings for a given class of shares should be interpreted
carefully by investors who hold or may invest in a different class of shares.

       The performance data below reflect Rule 12b-1 fees, where applicable,
sales charges as follows:

<TABLE>
<CAPTION>
                     Rule 12b-1 Fees                                  Sales Charges
         ----------------------------------------        ---------------------------------------
         Current
Class    Amount         Period
- -----    ------         ------
<S>      <C>            <C>                              <C>
B        1.00%          0% until June 1, 1993;           1- and 5-year periods reflect a 5% and 
                        1.00% June 1, 1993 to            a 2% contingent deferred sales charge, 
                        present; fee will reduce         respectively                           
                        performance for periods          
                        after June 1, 1993

C*       1.00%          0% until June 1, 1993;           1-year period reflects a 1% contingent  
                        1.00% June 1, 1993 to            deferred sales charge                   
                        present; fee will reduce         
                        performance for periods 
                        after June 1, 1993

E        0.00%          Since commencement of            None
                        operations to present

S*       0.00%          Since commencement of            None
                        operations to present

T**      0.00%          Since commencement of            None
                        operations to present
</TABLE>

- ------------------
*   Prior to November 1, 1997, the Fund's current Class C shares were designated
    as Class D shares and the Fund's current Class S shares were designated as 
    Class C shares.

                                       41
<PAGE>

**  Class T introduced August 1, 1998.


       All calculations of performance data in this section reflect the
voluntary measures, if any, by the Fund's affiliates to reduce fees or expenses
relating to the Fund; see "Accrued Expenses and Recurring Charges" later in this
section.

Total Return
- ------------

       The Fund's standard average annual total returns ("standard total
return") of each class of shares were as follows:

<TABLE>
<CAPTION>
                   Ten Years             Five Years            One Year
                     Ended                  Ended                Ended
                March 31, 1998         March 31, 1998       March 31, 1998
                --------------         --------------       --------------
<S>                  <C>                    <C>                 <C>  
Class B              4.82%                  3.03%               -0.91%
Class C*             4.82%                  3.39%                3.09%
Class E              5.32%                  4.37%                5.12%
Class S*             5.32%                  4.37%                5.12%
Class T**              N/A                    N/A                  N/A
</TABLE>

- ------------------
*   Prior to November 1, 1997, the Fund's current Class C shares were designated
    as Class D shares and the Fund's current Class S shares were designated as
    Class C shares.

**  Class T shares introduced August 1, 1998.

       Standard total return is computed separately for each class of shares by
determining the average annual compounded rates of return over the designated
periods that, if applied to the initial amount invested, would produce the
ending redeemable value in accordance with the following formula:



                                       42
<PAGE>

<TABLE>
<CAPTION>
                             P(1+T)(n) = ERV

       <S>            <C>    <C>
       Where:         P =    a hypothetical initial payment of $1,000

                      T =    average annual total return

                      n =    number of years

                      ERV =  ending redeemable value at the end of the 
                             designated period assuming a hypothetical 
                             $1,000 payment made at the beginning of the 
                             designated period
</TABLE>

       The calculation is based on the further assumptions that the highest
applicable initial or contingent deferred sales charge is deducted, and that all
dividends and distributions by the Fund are reinvested at net asset value on the
reinvestment dates during the periods. All accrued expenses and recurring
charges are also taken into account as described later herein.

Yield
- -----

       The Fund's yield is its investment income, less expenses, expressed as a
percentage of assets on an annualized basis for a seven-day period. The yield is
expressed as a simple annualized yield and as a compounded effective yield.

       The simple annualized yield for each of the Fund's Class B, Class C,
Class E, Class S and Class T shares is computed by determining the net change
(exclusive of realized gains and losses from the sale of securities and
unrealized appreciation and depreciation) in the value of a hypothetical
pre-existing account having a balance of one share at the beginning of the
seven-day period, dividing the net change in account value by the value of the
account at the beginning of the period, and annualizing the resulting quotient
(base period return) on a 365-day basis. The net change in account value
reflects the value of additional shares purchased with dividends from the
original shares in the account during the seven-day period, and expenses accrued
during the period. The compounded effective yield for each of the Fund's Class
B, Class C, Class E, Class S and Class T shares is computed by compounding the
unannualized base period return, by adding one to the base period return,
raising the sum to a power equal to 365 divided by seven and subtracting one
from the result.

       The simple annualized and compounded effective yields as quoted in
advertisements will not be based on information as of a date more than 14 days
prior to the date of publication. Actual yield will vary depending on market
conditions, and principal is not insured. Actual yield also depends on the
qualities, maturities and types of instruments held by the Fund as well as its
operating expenses.

                                       43
<PAGE>

       Any net realized capital gains of the Fund in excess of any available
loss carry forward will be distributed to shareholders of the Fund from time to
time as is deemed appropriate in maintaining the Fund's net asset value at one
dollar per share.

Accrued Expenses and Recurring Charges
- --------------------------------------

       Accrued expenses include all recurring charges that are charged to all
shareholder accounts in proportion to the length of the base period. The
standard total return results take sales charges, if applicable, into account
although the results do not take into account recurring and nonrecurring charges
for optional services which only certain shareholders elect and which involve
nominal fees, such as the $7.50 fee for wire orders.

       Accrued expenses do not include the subsidization, if any, by affiliates
of fees or expenses during the subject period. In the absence of such
subsidization, the performance of the Fund would have been lower.

Nonstandardized Total Return
- ----------------------------

       The Fund may provide the above described standard total return results
for Class B, Class C, Class E, Class S and Class T shares for periods which end
no earlier than the most recent calendar quarter end and which begin one, five
and ten years before. In addition, the Fund may provide nonstandardized total
return results for differing periods, such as for the most recent six months,
and/or without taking sales charges into account. Such nonstandardized total
return is computed as otherwise described under "Total Return" except the result
may or may not be annualized, and, as noted, any applicable sales charge, if
any, may not be taken into account and therefore not deducted from the
hypothetical initial payment of $1,000. For example, the Fund's nonstandardized
total returns for the six months ended March 31, 1998, without taking sales
charges into account, were as follows:

<TABLE>
       <S>                <C>  
       Class B            2.04%
       Class C*           2.04%
       Class E            2.53%
       Class S*           2.53%
       Class T**           N/A%
</TABLE>

- ------------------
*  Prior to November 1, 1997, the Fund's current Class C shares were designated
   as Class D shares and the Fund's current Class S shares were designated as 
   Class C shares.

** Class T shares introduced August 1, 1998.


                                       44
<PAGE>

                                    CUSTODIAN

       State Street Bank and Trust Company, 225 Franklin Street, Boston,
Massachusetts 02110, is the Trust's custodian. As custodian State Street Bank
and Trust Company is responsible for, among other things, safeguarding and
controlling the Fund's cash and securities, handling the receipt and delivery of
securities and collecting interest and dividends on the Fund's investments.
State Street Bank and Trust Company is not an affiliate of the Investment
Manager or its affiliates.


                             INDEPENDENT ACCOUNTANTS

       Price Waterhouse LLP, 160 Federal Street, Boston, Massachusetts 02110,
serves as the Trust's independent accountants, providing professional services
including (1) audits of the Fund's annual financial statements, (2) assistance
and consultation in connection with SEC filings and (3) review of the annual
income tax returns filed on behalf of the Fund.


                              FINANCIAL STATEMENTS

       In addition to the reports provided to holders of record on a semiannual
basis, other supplementary financial reports may be made available from time to
time through electronic or other media. Shareholders with substantial holdings
in one or more State Street Research Funds may also receive reports and other
information which reflect or analyze their positions in a consolidated manner.
For more information, call State Street Research Service Center.

       The following financial statements are for the Fund's fiscal year ended
March 31, 1998:



   
DOCSC\ 703255.1
    

    
                                   45

<PAGE>

<TABLE>
STATE STREET RESEARCH MONEY MARKET FUND

- -----------------------------------------------------------------------------------------------------------------
INVESTMENT PORTFOLIO
- -----------------------------------------------------------------------------------------------------------------
March 31, 1998
<CAPTION>
- -----------------------------------------------------------------------------------------------------------------
                                                          PRINCIPAL              MATURITY                VALUE
                                                           AMOUNT                 DATE                 (NOTE 1)
- -----------------------------------------------------------------------------------------------------------------
<S>                                                     <C>                     <C>                  <C>
COMMERCIAL PAPER 100.1%
AUTOMOTIVE 7.4%
Ford Motor Credit Co., 5.49% .....................      $  6,600,000            6/12/1998            $  6,527,532
General Motors Acceptance Corp., 5.44% ...........         4,100,000            5/01/1998               4,081,413
General Motors Acceptance Corp., 5.44% ...........         3,200,000            5/15/1998               3,178,724
General Motors Acceptance Corp., 5.48% ...........         5,000,000            6/12/1998               4,945,200
                                                                                                     ------------
                                                                                                       18,732,869
                                                                                                     ------------
BANK 14.8%
Canadian Imperial Holdings, Inc., 5.45% ..........         8,000,000            5/13/1998               7,949,180
Canadian Imperial Holdings, Inc., 5.43% ..........         5,000,000            5/20/1998               4,963,046
J.P. Morgan & Co. Inc., 5.40% ....................         5,000,000            5/15/1998               4,967,000
J.P. Morgan & Co. Inc., 5.43% ....................         3,000,000            5/15/1998               2,980,090
J.P. Morgan & Co. Inc., 5.44% ....................         2,000,000            5/21/1998               1,984,889
J.P. Morgan & Co. Inc., 5.48% ....................         2,300,000            6/15/1998               2,273,742
Toronto Dominion Holdings, Inc., 5.57% ...........         6,200,000            4/07/1998               6,194,244
Toronto Dominion Holdings, Inc., 5.46% ...........         6,000,000            4/09/1998               5,992,720
                                                                                                     ------------
                                                                                                       37,304,911
                                                                                                     ------------
CANADIAN 7.1%
Canadian Wheat Board, 5.40% ......................         2,800,000            4/22/1998               2,791,180
Canadian Wheat Board, 5.40% ......................         6,200,000            4/24/1998               6,178,610
Province of British Columbia, 5.41% ..............         2,900,000            6/01/1998               2,873,416
Province of Quebec, 5.47% ........................         6,000,000            6/30/1998               5,917,950
                                                                                                     ------------
                                                                                                       17,761,156
                                                                                                     ------------
CHEMICAL 9.7%
E.I. Du Pont De Nemours & Co., 5.39% .............         5,000,000            4/27/1998               4,980,536
E.I. Du Pont De Nemours & Co., 5.41% .............         6,000,000            4/29/1998               5,974,753
Monsanto Co., 5.48% ..............................         1,000,000            4/24/1998                 996,550
Monsanto Co., 5.38% ..............................         5,000,000            5/12/1998               4,969,364
Monsanto Co., 5.45% ..............................         5,000,000            5/12/1998               4,968,965
Monsanto Co., 5.38% ..............................         2,630,000            5/13/1998               2,613,493
                                                                                                     ------------
                                                                                                       24,503,661
                                                                                                     ------------
DIVERSIFIED 4.1%
Cargill Inc., 6.00% ..............................         3,724,000            4/01/1998               3,724,000
Cargill Inc., 5.72% ..............................         6,610,000            4/02/1998               6,608,950
                                                                                                     ------------
                                                                                                       10,332,950
                                                                                                     ------------
ELECTRIC 2.0%
Florida Power Corp., 5.50% .......................         5,000,000            5/21/1998               4,961,805
                                                                                                     ------------
ELECTRICAL EQUIPMENT 5.0%
General Electric Capital Corp., 5.48% ............         6,900,000            5/22/1998               6,846,433
General Electric Capital Corp., 5.48% ............         5,700,000            6/01/1998               5,647,072
                                                                                                     ------------
                                                                                                       12,493,505
                                                                                                     ------------
FINANCIAL SERVICE 30.7%
American General Finance Corp., 5.50% ............         8,000,000            7/06/1998               7,882,667
American General Finance Corp., 5.50% ............         4,000,000            7/13/1998               3,937,055
Associates Corp. of North America, 5.49% .........         5,900,000            6/11/1998               5,836,118
BankAmerica Corp., 5.48% .........................         6,000,000            4/10/1998               5,991,780
Beneficial Corp., 5.46% ..........................         4,500,000            5/06/1998               4,476,112
Beneficial Corp., 5.50% ..........................         5,000,000            6/26/1998               4,934,306
Beneficial Corp., 5.50% ..........................         3,000,000            7/13/1998               2,952,792
Chevron USA Inc., 5.48% ..........................        10,000,000            6/05/1998               9,901,055
CIT Group Holdings Inc., 5.44% ...................         9,000,000            5/28/1998               8,922,480
Commercial Credit Co., 5.48% .....................         4,000,000            6/22/1998               3,950,071
Goldman Sachs Group LP, 5.47% ....................         1,000,000            4/06/1998                 999,250
Household Finance Corp., 5.68% ...................         5,000,000            4/06/1998               4,996,056
Merrill Lynch & Company Inc., 5.46% ..............         5,000,000            4/09/1998               4,993,933
Merrill Lynch & Company Inc., 5.43% ..............         5,500,000            4/30/1998               5,475,942
Merrill Lynch & Company Inc., 5.45% ..............         1,000,000            5/13/1998                 993,642
Merrill Lynch & Company Inc., 5.49% ..............         1,000,000            6/12/1998                 989,020
                                                                                                     ------------
                                                                                                       77,232,279
                                                                                                     ------------
FOOD & BEVERAGE 6.9%
Coca-Cola Co., 5.43% .............................        12,500,000            4/17/1998              12,470,222
H.J. Heinz Co., 5.45% ............................         5,000,000            4/14/1998               4,990,160
                                                                                                     ------------
                                                                                                       17,460,382
                                                                                                     ------------
MACHINERY 4.8%
John Deere Capital Corp., 5.44% ..................         7,500,000            4/30/1998               7,467,133
John Deere Capital Corp., 5.43% ..................         4,700,000            5/18/1998               4,666,681
                                                                                                     ------------
                                                                                                       12,133,814
                                                                                                     ------------
RETAIL TRADE 7.6%
J.C. Penney Funding Corp., 5.50% .................         7,000,000            7/01/1998               6,902,681
Sears Roebuck Acceptance Corp., 5.44% ............         2,000,000            5/06/1998               1,989,422
Sears Roebuck Acceptance Corp., 5.44% ............         2,000,000            5/13/1998               1,987,307
Sears Roebuck Acceptance Corp., 5.50% ............         8,300,000            6/19/1998               8,199,823
                                                                                                     ------------
                                                                                                       19,079,233
                                                                                                     ------------
Total Commercial Paper (Cost $251,996,565) ..............................................             251,996,565
                                                                                                     ------------
REPURCHASE AGREEMENTS 0.4%
State Street Bank and Trust Co., dated 3/31/98,
  4.25%, repurchase proceeds $993,117,
  collateralized by, $1,005,000 U.S. Treasury
  Note, 5.875%, due 1/31/99, market value
  $1,006,256 .....................................           993,000            4/01/1998                 993,000
                                                                                                     ------------
Total Repurchase Agreements (Cost $993,000) .............................................                 993,000
                                                                                                     ------------
Total Investments (Cost $252,989,565) - 100.5% ..........................................             252,989,565
Cash and Other Assets, Less Liabilities - (0.5%) ........................................              (1,133,623)
                                                                                                     ------------
Net Assets - 100.0% .....................................................................            $251,855,942
                                                                                                     ============

The accompanying notes are an integral part of the financial statements.
</TABLE>


                                       46
<PAGE>

STATE STREET RESEARCH MONEY MARKET FUND

- --------------------------------------------------------------------------------
STATEMENT OF ASSETS AND LIABILITIES
- --------------------------------------------------------------------------------
March 31, 1998

ASSETS
Investments, at value (Cost $252,989,565) (Note 1) ..............   $252,989,565
Cash ............................................................            134
Receivable for fund shares sold .................................      3,229,161
Receivable from Distributor (Note 3) ............................         44,480
Other assets ....................................................         26,519
                                                                    ------------
                                                                     256,289,859
LIABILITIES
Payable for fund shares redeemed ................................      3,868,602
Accrued transfer agent and shareholder services (Note 2) ........        167,076
Dividends payable ...............................................        150,056
Accrued management fee (Note 2) .................................        105,511
Accrued trustees' fees (Note 2) .................................         16,326
Accrued distribution and service fees (Note 5) ..................         13,907
Other accrued expenses ..........................................        112,439
                                                                    ------------
                                                                       4,433,917
                                                                    ------------
NET ASSETS ......................................................   $251,855,942
                                                                    ============

Net Assets consist of:
  Paid-in capital ...............................................   $251,855,942
                                                                    ============
Net Asset Value and offering price per share of Class B shares
  ($14,567,090 / 14,567,090 shares)* ............................          $1.00
                                                                           =====
Net Asset Value and offering price per share of Class C shares
  ($2,314,026 / 2,314,026 shares)* ..............................          $1.00
                                                                           =====
Net Asset Value, offering price and redemption
  price per share of Class E shares
  ($221,475,031 / 221,475,031 shares) ...........................          $1.00
                                                                           =====
Net Asset Value, offering price and redemption
  price per share of Class S shares
  ($13,499,795 / 13,499,795 shares) .............................          $1.00
                                                                           =====

- --------------------------------------------------------------------------------
*Redemption price per share for Class B and Class C is equal to net asset
 value less any applicable contingent deferred sales charge.

- --------------------------------------------------------------------------------
STATEMENT OF OPERATIONS
- --------------------------------------------------------------------------------
For the year ended March 31, 1998

INVESTMENT INCOME
Interest ........................................................   $13,822,338
EXPENSES
Management fee (Note 2) .........................................     1,219,931
Transfer agent and shareholder services (Note 2) ................       557,033
Custodian fee ...................................................       107,214
Reports to shareholders .........................................        40,021
Distribution and service fees-Class B (Note 5) ..................       151,763
Distribution and service fees-Class C (Note 5) ..................        11,029
Registration fees ...............................................        69,977
Trustees' fees (Note 2) .........................................        30,318
Audit fee .......................................................        25,595
Legal fees ......................................................        16,806
Miscellaneous ...................................................        15,433
                                                                    -----------
                                                                      2,245,120
Expenses borne by the Distributor (Note 3) ......................      (494,474)
                                                                    -----------
                                                                      1,750,646
                                                                    -----------
Net investment income and net increase in net assets resulting
  from operations ...............................................   $12,071,692
                                                                    ===========

The accompanying notes are an integral part of the financial statements.

                                       47
<PAGE>
STATE STREET RESEARCH MONEY MARKET FUND
<TABLE>

- ------------------------------------------------------------------------------------------------------
STATEMENT OF CHANGES IN NET ASSETS
- ------------------------------------------------------------------------------------------------------
<CAPTION>

                                                                         YEARS ENDED MARCH 31
                                                                 -------------------------------------
                                                                     1997                      1998
- ------------------------------------------------------------------------------------------------------
<S>                                                               <C>                     <C>
INCREASE (DECREASE) IN NET ASSETS
Operations:
Net investment income and net increase resulting from
  operations ..............................................       $ 10,662,268            $ 12,071,692
                                                                  ------------            ------------
Dividends from net investment income:
  Class B .................................................           (492,831)               (608,692)
  Class C .................................................            (25,541)                (44,252)
  Class E .................................................         (9,409,336)            (10,636,161)
  Class S .................................................           (734,560)               (782,587)
                                                                  ------------            ------------
                                                                   (10,662,268)            (12,071,692)
                                                                  ------------            ------------

Net increase (decrease) from fund share transactions
  (Note 6) ................................................         (3,137,041)             27,845,850
                                                                  ------------            ------------

Total increase (decrease) in net assets ...................         (3,137,041)             27,845,850

NET ASSETS
Beginning of year .........................................        227,147,133             224,010,092
                                                                  ------------            ------------
End of year ...............................................       $224,010,092            $251,855,942
                                                                  ============            ============
</TABLE>
<PAGE>
- --------------------------------------------------------------------------------
NOTES TO FINANCIAL STATEMENTS
- --------------------------------------------------------------------------------
May 31, 1998

NOTE 1

State Street Research Money Market Fund (the "Fund"), is a series of State
Street Research Money Market Trust (the "Trust"), which was organized as a
Massachusetts business trust in April, 1985 and is registered under the
Investment Company Act of 1940, as amended, as an open-end management
investment company. The Fund commenced operations in August, 1986. The Fund is
presently the only active series of the Trust, although the Trustees have the
authority to create an unlimited number of series.

The investment objective of the Fund is to seek a high level of current income
consistent with preservation of capital and maintenance of liquidity. The Fund
seeks to achieve its investment objective by investing in securities issued or
guaranteed as to principal and interest by the U.S. Government or its agencies
or instrumentalities as well as high quality, short-term money market
instruments such as bank certificates of deposit, bankers' acceptances and
such short-term corporate debt securities as commercial paper and master
demand notes.

The Fund offers four classes of shares. Before November 1, 1997, Class C
shares were designated Class D and Class S shares were designated Class C.
Class B shares are subject to a contingent deferred sales charge on certain
redemptions made within five years of purchase and pay annual distribution and
service fees of 1.00%. Class B shares automatically convert into Class E
shares (which pay lower ongoing expenses) at the end of eight years after the
issuance of the Class B shares. Class C shares are subject to a contingent
deferred sales charge of 1.00% on any shares redeemed within one year of their
purchase. Class C shares also pay annual distribution and service fees of
1.00%. Class E shares are offered to any individual. Class E shares are not
subject to any initial or contingent deferred sales charges and do not pay any
distribution or service fees. Class S shares are only offered through certain
retirement accounts, advisory accounts of State Street Research & Management
Company (the "Adviser"), an indirect wholly owned subsidiary of Metropolitan
Life Insurance Company ("Metropolitan"), and special programs. No sales charge
is imposed at the time of purchase or redemption of Class S shares. Class S
shares do not pay any distribution or service fees. The Fund's expenses are
borne pro rata by each class, except that each class bears expenses, and has
exclusive voting rights with respect to provisions of the Plan of
Distribution, related specifically to that class. The Trustees declare
separate dividends on each class of shares.

The following significant accounting policies are consistently followed by the
Fund in preparing its financial statements, and such policies are in
conformity with generally accepted accounting principles for investment
companies.

   
                                       48
    

<PAGE>


A. INVESTMENT VALUATION
The Fund values securities at amortized cost, pursuant to which the Fund must
adhere to certain conditions. The amortized cost method involves valuing a
portfolio security initially at its cost and thereafter assuming a constant
amortization to maturity of any discount or premium regardless of the effect
of fluctuating interest rates on the market value of the investments.

B. SECURITY TRANSACTIONS
Security transactions are accounted for on the trade date (date the order to
buy or sell is executed). Realized gains or losses, if any, are reported on
the basis of identified cost of securities delivered.

C. NET INVESTMENT INCOME
Net investment income is determined daily and consists of interest accrued and
discount earned, less amortization of premium and the estimated daily expenses
of the Fund. Interest income is accrued daily as earned.

D. DIVIDENDS
Dividends from net investment income are declared daily and paid or reinvested
monthly. Net realized capital gains, if any, are distributed annually, unless
additional distributions are required for compliance with applicable tax
regulations.

E. FEDERAL INCOME TAXES
No provision for Federal income taxes is necessary because the Fund has
elected to qualify under Subchapter M of the Internal Revenue Code and its
policy is to distribute all of its taxable income, including net realized
capital gains, within the prescribed time periods.

F. ESTIMATES
The preparation of financial statements in conformity with generally accepted
accounting principles requires management to make estimates and assumptions
that affect the reported amounts of assets and liabilities and disclosure of
contingent assets and liabilities at the date of the financial statements and
the reported amounts of income and expenses during the reporting period.
Actual results could differ from those estimates.

NOTE 2

The Trust and the Adviser have entered into an agreement under which the
Adviser earns monthly fees at an annual rate of 0.50% of the Fund's average
daily net assets. In consideration of these fees, the Adviser furnishes the
Fund with management, investment advisory, statistical and research facilities
and services. The Adviser also pays all salaries, rent and certain other
expenses of management. During the year ended March 31, 1998, the fees
pursuant to such agreement amounted to $1,219,931.

State Street Research Service Center, a division of State Street Research
Investment Services, Inc., the Trust's principal underwriter (the
"Distributor"), an indirect wholly owned subsidiary of Metropolitan, provides
certain shareholder services to the Fund such as responding to inquiries and
instructions from investors with respect to the purchase and redemption of
shares of the Fund. In addition, Metropolitan receives a fee for maintenance of
the accounts of certain shareholders who are participants in sponsored
arrangements, employee benefit plans and similar programs or plans, through or
under which shares of the Fund may be purchased. During the year ended March 31,
1998, the amount of such expenses was $106,277.

The fees of the Trustees not currently affiliated with the Adviser amounted to
$30,318 during the year ended March 31, 1998.

NOTE 3

The Distributor and its affiliates may from time to time and in varying
amounts voluntarily assume some portion of fees or expenses relating to the
Fund. During the year ended March 31, 1998, the amount of such expenses
assumed by the Distributor and its affiliates was $494,474.

NOTE 4

For the year ended March 31, 1998, purchases and sales, including maturities,
of securities aggregated $2,531,914,011 and $2,514,344,898, respectively.

NOTE 5

The Trust has adopted a Plan of Distribution pursuant to Rule 12b-1 (the "Plan")
under the Investment Company Act of 1940. Under the Plan, the Fund pays annual
distribution and service fees to the Distributor at a rate of 0.75% and 0.25%,
respectively, of average daily net assets for Class B and Class C shares. The
Distributor uses such payments for personal services and/or the maintenance or
servicing of shareholder accounts, to reimburse securities dealers for
distribution and marketing services, to furnish ongoing assistance to investors
and to defray a portion of its distribution and marketing expenses. For the year
ended March 31, 1998, fees pursuant to such plan amounted to $151,763 and
$11,029 for Class B and Class C shares, respectively.

The Fund has been informed that MetLife Securities, Inc., a wholly-owned
subsidiary of Metropolitan, earned commissions aggregating $10,835 on sales of
the Fund's Class B shares and that the Distributor collected contingent
deferred sales charges aggregating $185,067 and $6,967 on redemptions of Class
B and Class C shares, respectively, during the year ended March 31, 1998.

   
                                       49
    

<PAGE>


NOTE 6

The Trustees have the authority to issue an unlimited number of shares of
beneficial interest, $.001 par value per share.

At March 31, 1998, Metropolitan owned 73,599 Class B shares, 390,722 Class C
shares and 473,126 Class S shares and Metropolitan and certain of its
affiliates held of record 43,148,887 Class E shares of the Fund.

Share transactions were as follows:

<TABLE>
<CAPTION>
                                                       YEARS ENDED MARCH 31
                           ----------------------------------------------------------------------------
                                           1997                                   1998
                           -------------------------------------  -------------------------------------
CLASS B                           SHARES              AMOUNT             SHARES              AMOUNT
- ---------------------------------------------------------------------------------------------------------
<S>                            <C>                <C>                 <C>                <C>
Shares sold .............        28,609,585        $ 28,609,585         38,774,433       $  38,774,433
Issued upon reinvestment
  of dividends ..........           414,928             414,928            522,933             522,933
Shares repurchased ......       (24,926,640)        (24,926,640)       (40,711,796)        (40,711,796)
                               ------------        ------------       ------------       -------------
Net increase (decrease) .         4,097,873        $  4,097,873         (1,414,430)      $  (1,414,430)
                               ============        ============       ============       =============

<CAPTION>
CLASS C (FORMERLY CLASS D)        SHARES              AMOUNT             SHARES              AMOUNT
- ---------------------------------------------------------------------------------------------------------
<S>                            <C>                <C>                 <C>                <C>
Shares sold .............        29,948,381        $ 29,948,381         20,294,283       $  20,294,283
Issued upon reinvestment
  of dividends ..........            15,948              15,948             31,087              31,087
Shares repurchased ......       (30,968,955)        (30,968,955)       (18,970,254)        (18,970,254)
                               ------------        ------------       ------------       -------------
Net increase (decrease) .        (1,004,626)       $ (1,004,626)         1,355,116       $   1,355,116
                               ============        ============       ============       =============

<CAPTION>
CLASS E                           SHARES              AMOUNT             SHARES              AMOUNT
- ---------------------------------------------------------------------------------------------------------
<S>                            <C>                <C>                 <C>                <C>
Shares sold .............       785,239,791        $785,239,791        903,590,545       $ 903,590,545
Issued upon reinvestment
  of dividends ..........         6,052,998           6,052,998          7,580,531           7,580,531
Shares repurchased ......      (796,041,966)       (796,041,966)      (882,055,600)       (882,055,600)
                               ------------        ------------       ------------       -------------
Net increase (decrease) .        (4,749,177)       $ (4,749,177)        29,115,476       $  29,115,476
                               ============        ============       ============       =============

<CAPTION>
CLASS S (FORMERLY CLASS C)        SHARES              AMOUNT             SHARES              AMOUNT
- ---------------------------------------------------------------------------------------------------------
<S>                            <C>                <C>                 <C>                <C>
Shares sold .............        32,645,556        $ 32,645,556         39,426,406       $  39,426,406
Issued upon reinvestment
  of dividends ..........           675,535             675,535            670,467             670,467
Shares repurchased ......       (34,802,202)        (34,802,202)       (41,307,185)        (41,307,185)
                               ------------        ------------       ------------       -------------
Net decrease ............        (1,481,111)       $ (1,481,111)        (1,210,312)      $  (1,210,312)
                               ============        ============       ============       =============
</TABLE>

   
                                       50
    

<PAGE>

STATE STREET RESEARCH MONEY MARKET FUND
<TABLE>

- ----------------------------------------------------------------------------------------------------------------------------
FINANCIAL HIGHLIGHTS
- ----------------------------------------------------------------------------------------------------------------------------

For a share outstanding throughout each year:
<CAPTION>

                                                                                  CLASS B
                                           ---------------------------------------------------------------------------------
                                                                           YEARS ENDED MARCH 31
                                           ---------------------------------------------------------------------------------
                                             1994(1)              1995              1996             1997              1998
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                 <C>               <C>               <C>               <C>
NET ASSET VALUE, BEGINNING OF YEAR ($)       1.000               1.000             1.000             1.000             1.000
                                             -----               -----             -----             -----             -----
  Net investment income ($)*                 0.012               0.032             0.041             0.037             0.040
  Dividends from net investment
    income ($)                              (0.012)             (0.032)           (0.041)           (0.037)           (0.040)
                                             -----               -----             -----             -----             -----
NET ASSET VALUE, END OF YEAR ($)             1.000               1.000             1.000             1.000             1.000
                                             =====               =====             =====             =====             =====
Total return(2) (%)                           1.27(3)             3.27              4.16              3.72              4.09

RATIOS/SUPPLEMENTAL DATA:

Net assets at end of year ($
  thousands)                                 3,028               9,322            11,884            15,982            14,567

Ratio of operating expenses to
  average net assets (%)*                     1.75(4)             1.75              1.75              1.75              1.65

Ratio of net investment income to
  average net assets (%)*                     1.54(4)             3.53              4.06              3.69              4.01

*Reflects voluntary assumption of
  fees or expenses per share
  in each year (Note 3) ($)                  0.007               0.004             0.003             0.002             0.002


<CAPTION>
                                                                        CLASS C (FORMERLY CLASS D)
                                           ---------------------------------------------------------------------------------
                                                                           YEARS ENDED MARCH 31
                                           ---------------------------------------------------------------------------------
                                             1994(1)              1995              1996             1997              1998
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                 <C>               <C>               <C>               <C>
NET ASSET VALUE, BEGINNING OF YEAR ($)       1.000               1.000             1.000             1.000             1.000
                                             -----               -----             -----             -----             -----
  Net investment income ($)*                 0.013               0.032             0.041             0.037             0.040
  Dividends from net investment
    income ($)                              (0.013)             (0.032)           (0.041)           (0.037)           (0.040)
                                             -----               -----             -----             -----             -----
NET ASSET VALUE, END OF YEAR ($)             1.000               1.000             1.000             1.000             1.000
                                             =====               =====             =====             =====             =====
Total return(2) (%)                           1.30(3)             3.28              4.16              3.72              4.09

RATIOS/SUPPLEMENTAL DATA:

Net assets at end of year ($
  thousands)                                   174                 842             1,964               959             2,314

Ratio of operating expenses to
  average net assets (%)*                     1.75(4)             1.75              1.75              1.75              1.65

Ratio of net investment income to
  average net assets (%)*                     1.54(4)             3.30              4.08              3.68              4.01

*Reflects voluntary assumption of
  fees or expenses per share
  in each year (Note 3) ($)                  0.002               0.005             0.003             0.002             0.002

- ----------------------------------------------------------------------------------------------------------------------------
(1)  June 1, 1993 (commencement of share class designations) to March 31, 1994.
(2)  Does not reflect any front-end or contingent deferred sales charges. Total return would be lower if the Distributor
     and its affiliates had not voluntarily assumed a portion of the Fund's expenses.
(3)  Not annualized.
(4)  Annualized.
</TABLE>

   
                                       51
    

<PAGE>

<TABLE>
<CAPTION>
                                                                                  Class E
                                          ----------------------------------------------------------------------------------
                                                                           Years ended March 31
                                          ----------------------------------------------------------------------------------
                                             1994(5)              1995              1996             1997              1998
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                 <C>               <C>               <C>               <C>
NET ASSET VALUE, BEGINNING OF YEAR ($)       1.000               1.000             1.000             1.000             1.000
                                             -----               -----             -----             -----             -----
  Net investment income ($)*                 0.025               0.042             0.051             0.047             0.050

  Dividends from net investment
    income ($)                              (0.025)             (0.042)           (0.051)           (0.047)           (0.050)
                                             -----               -----             -----             -----             -----
NET ASSET VALUE, END OF YEAR ($)             1.000               1.000             1.000             1.000             1.000
                                             =====               =====             =====             =====             =====

Total return(2) (%)                           2.48                4.31              5.20              4.78              5.12

RATIOS/SUPPLEMENTAL DATA:

Net assets at end of year
  ($ thousands)                            138,129             150,491           197,109           192,360           221,475

Ratio of operating expenses to
  average net assets (%)*                     0.75                0.75              0.75              0.75              0.65

Ratio of net investment income to
  average net assets (%)*                     2.46                4.26              5.06              4.69              5.01

*Reflects voluntary assumption of
  fees or expenses per share
  in each year (Note 3) ($)                  0.003               0.006             0.003             0.002             0.002


<CAPTION>
                                                                        CLASS S (FORMERLY CLASS C)
                                        ------------------------------------------------------------------------------------
                                                                           YEARS ENDED MARCH 31
                                        ------------------------------------------------------------------------------------
                                              1994(1)             1995              1996             1997             1998
- ----------------------------------------------------------------------------------------------------------------------------
<S>                                          <C>                 <C>               <C>               <C>               <C>
NET ASSET VALUE, BEGINNING OF YEAR ($)       1.000               1.000             1.000             1.000             1.000
                                             -----               -----             -----             -----             -----
  Net investment income ($)*                 0.021               0.042             0.051             0.047             0.050
  Dividends from net investment
    income ($)                              (0.021)             (0.042)           (0.051)           (0.047)           (0.050)
                                             -----               -----             -----             -----             -----
NET ASSET VALUE, END OF YEAR ($)             1.000               1.000             1.000             1.000             1.000
                                             =====               =====             =====             =====             =====
Total return(2) (%)                           2.08(3)             4.31              5.20              4.78              5.12

RATIOS/SUPPLEMENTAL DATA:

Net assets at end of year
  ($ thousands)                              1,786               7,886            16,191            14,710            13,500

Ratio of operating expenses to
  average net assets (%)*                     0.75(4)             0.75              0.75              0.75              0.65

Ratio of net investment income to
  average net assets (%)*                     2.54(4)             4.66              5.03              4.69              5.01

*Reflects voluntary assumption of
  fees or expenses per share
  in each year (Note 3) ($)                  0.006               0.003             0.003             0.002             0.002

- ----------------------------------------------------------------------------------------------------------------------------
(1) June 1, 1993 (commencement of share class designations) to March 31, 1994.
(2) Does not reflect any front-end or contingent deferred sales charges. Total return would be lower if the Distributor and
    its affiliates had not voluntarily assumed a portion of the Fund's expenses.
(3) Not annualized.
(4) Annualized.
(5) Effective November 30, 1993, the Fund discontinued offering Class A shares and any existing Class A shares were
    redesignated Class E shares. Net investment income and dividends amounted to $.011 per share for Class A shares during
    the period June 1, 1993 (commencement of share class designations) to November 30, 1993.
</TABLE>

   
                                       52
    

<PAGE>

- --------------------------------------------------------------------------------
REPORT OF INDEPENDENT ACCOUNTANTS
- --------------------------------------------------------------------------------

TO THE TRUSTEES OF STATE STREET RESEARCH MONEY MARKET TRUST AND
THE SHAREHOLDERS OF STATE STREET RESEARCH MONEY MARKET FUND:

In our opinion, the accompanying statement of assets and liabilities, including
the investment portfolio, 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 State Street Research Money Market
Fund (a series of State Street Research Money Market Trust, hereafter referred
to as the "Trust") at March 31, 1998, and the results of its operations, the
changes in its net assets and the financial highlights for the periods
indicated, in conformity with generally accepted accounting principles. These
financial statements and financial highlights (hereafter referred to as
"financial statements") are the responsibility of the Trust'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 March
31, 1998 by correspondence with the custodian, provide a reasonable basis for
the opinion expressed above.

Price Waterhouse LLP
Boston, Massachusetts
May 8, 1998

                                       53


<PAGE>
STATE STREET RESEARCH MONEY MARKET FUND

- -------------------------------------------------------------------------------
REPORT ON SPECIAL MEETING OF SHAREHOLDERS
- -------------------------------------------------------------------------------

A Special Meeting of Shareholders of the State Street Research Money Market
Fund ("Fund"), a series of State Street Research Money Market Trust ("Trust"),
was convened on December 19, 1997 ("Meeting"), and continued thereafter. The
results of the Meeting are set forth below.
<TABLE>
<CAPTION>

                                                     VOTES (MILLIONS OF
                                                           SHARES)
                                                  -----------------------
ACTION ON PROPOSAL                                  FOR        WITHHELD
- -------------------------------------------------------------------------
<S>                                                <C>            <C>
1. The following persons were elected as Trustees:
   Steve A. Garban ..............................  137.9          3.7
   Malcolm T. Hopkins ...........................  137.9          3.8
   Thomas L. Phillips ...........................  137.9          3.8
   Toby Rosenblatt ..............................  137.8          3.9
   Ralph F. Verni ...............................  137.7          3.9


                                                   VOTES (MILLIONS OF SHARES)
                                                  ----------------------------
ACTION ON PROPOSAL                                 FOR     AGAINST    ABSTAIN
- --------------------------------------------------------------------------------
<S>                                               <C>       <C>         <C>
2.   The Fund's fundamental policy regarding
     investments in illiquid securities was
     amended and was reclassified from
     fundamental to nonfundamental  ............  126.6      5.8        8.7

3.   The Fund's fundamental policy regarding
     industry concentration was amended ........  126.8      5.5        8.7

4.   The Fund's fundamental policies regarding
     diversification of investments were amended  127.7      5.3        8.0

5.   The Fund's fundamental policy on lending
     was amended to clarify the permissibility
     of securities lending .....................  125.3      7.1        8.6

6.   The Fund's policy regarding investments in
     securities of companies with less than
     three (3) years' continuous operation was
     eliminated ................................  119.8     12.7        8.4

7.   The Master Trust Agreement was not amended
     to permit the Trustees to reorganize, merge
     or liquidate a fund without prior
     shareholder approval ......................  117.2     15.4        8.4

8.   The Master Trust Agreement was amended to
     eliminate specified time permitted between
     the record date and any shareholders
     meeting ...................................  123.8      8.2        9.0
</TABLE>


                                       54





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