MFS UNION STANDARD TRUST
497, 1997-08-05
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<PAGE>

   
                                          PROSPECTUS
                                          August 1, 1997
MFS(R) UNION STANDARD(R)                  Class A Shares of Beneficial Interest
EQUITY FUND                               Class B Shares of Beneficial Interest
(A Member of the MFS Family of Funds(R))  Class C Shares of Beneficial Interest
- -------------------------------------------------------------------------------
                                                                           Page
                                                                           ---
1. Expense Summary .....................................................     2
2. Condensed Financial Information .....................................     3
3. The Fund ............................................................     4
4. Labor Sensitivity Index .............................................     4
5. Investment Objective and Policies ...................................     5
6. Investment Techniques ...............................................     6
7. Management of the Fund ..............................................     9
8. Information Concerning Shares of the Fund ...........................    11
      Purchases ........................................................    11
      Exchanges ........................................................    16
      Redemptions and Repurchases ......................................    17
      Distribution Plan ................................................    19
      Distributions ....................................................    20
      Tax Status .......................................................    20
      Net Asset Value ..................................................    21
      Description of Shares, Voting Rights and Liabilities .............    21
      Performance Information ..........................................    22
      Expenses .........................................................    22
9. Shareholder Services ................................................    23
   Appendix A ..........................................................   A-1
   Appendix B ..........................................................   B-1
    

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES
  AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE
    SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
        PASSED UPON THE ACCURACY OR  ADEQUACY OF THIS PROSPECTUS. ANY
            REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

   
MFS(R) UNION STANDARD(R) EQUITY FUND
500 Boylston Street, Boston, Massachusetts 02116 (617) 954-5000 MFS(R) Union
Standard(R) Equity Fund (the "Fund") is a series of MFS(R) Union Standard(R)
Trust (the "Trust"), a professionally managed open-end, investment management
company. The Fund's investment objective is to provide long term growth of
capital. The Fund invests in companies which meet certain labor sensitivity
criteria selected for inclusion in the ACS Labor Sensitivity Index(SM) (the
"LSI(SM)") and may make economically targeted investments. The LSI is a common
stock index comprised of companies selected based on labor sensitivity criteria.
The minimum initial investment generally is $1,000 per account (see "Information
Concerning Shares of the Fund -- Purchases").
    

The Fund's investment adviser and distributor are Massachusetts Financial
Services Company ("MFS" or the "Adviser") and MFS Fund Distributors, Inc.
("MFD"), respectively, both of which are located at 500 Boylston Street, Boston,
Massachusetts 02116.

INVESTMENT PRODUCTS ARE NOT INSURED BY THE FDIC OR ANY OTHER GOVERNMENT AGENCY,
AND ARE NOT DEPOSITS OR OTHER OBLIGATIONS OF, OR GUARANTEED BY, ANY FINANCIAL
INSTITUTION. SHARES OF MUTUAL FUNDS ARE SUBJECT TO INVESTMENT RISK, INCLUDING
POSSIBLE LOSS OF THE PRINCIPAL AMOUNT INVESTED, AND WILL FLUCTUATE IN VALUE. YOU
MAY RECEIVE MORE OR LESS THAN YOU PAID WHEN YOU REDEEM YOUR SHARES.

   
This Prospectus sets forth concisely the information concerning the Fund that a
prospective investor ought to know before investing. The Fund has filed with the
Securities and Exchange Commission (the "SEC") a Statement of Additional
Information dated August 1, 1997, as amended or supplemented from time to time
(the "SAI"), which contains more detailed information about the Fund. The SAI is
incorporated into this Prospectus by reference. See page 24 for a further
description of the information set forth in the SAI. A copy of the SAI may be
obtained without charge by contacting the Shareholder Servicing Agent (see back
cover for address and phone number). The SEC maintains an Internet World Wide
Web site (http://www.sec.gov) that contains the SAI, materials that are
incorporated by reference into this Prospectus and the SAI, and other
information regarding the Fund. This Prospectus is available on the Adviser's
Internet World Wide Web site at http://www.mfs.com.
    

  INVESTORS SHOULD READ THIS PROSPECTUS AND RETAIN IT FOR FUTURE REFERENCE.
<PAGE>
<TABLE>
<CAPTION>

1.  EXPENSE SUMMARY
SHAREHOLDER TRANSACTION EXPENSES:                                          CLASS A         CLASS B         CLASS C
                                                                           -------         -------         -------
<S>                                                                        <C>             <C>             <C>  
    Maximum Initial Sales Charge Imposed on Purchases of Fund
      Shares (as a percentage of public offering price) ...........        5.75%           0.00%           0.00%
    Maximum Contingent Deferred Sales Charge (as a percentage of
      original purchase price or redemption proceeds, as applicable)   See Below(1)        4.00%           1.00%

   
ANNUAL OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET ASSETS):
    Management Fees ...............................................        0.65%           0.65%           0.65%
    Rule 12b-1 Fees ...............................................        0.35%(2)        1.00%(3)        1.00%(3)
    Other Expenses (after expense limitation)(4)(5) ...............        0.20%           0.20%           0.20%
                                                                           ----            ----            ----
    Total Operating Expenses (after expense limitation)(4) ........        1.20%           1.85%           1.85%
- ------------
(1) Purchases of $1 million or more and certain purchases by retirement plans are not subject to an initial
    sales charge; however, a contingent deferred sales charge (a "CDSC") of 1% will be imposed on such purchases
    in the event of certain redemption transactions within 12 months following such purchases (see "Information
    Concerning Shares of the Fund -- Purchases" below).
(2) The Fund has adopted a distribution plan for its shares in accordance with Rule 12b-1 under the Investment
    Company Act of 1940, as amended (the "1940 Act") (the "Distribution Plan"), which provides that it will pay
    distribution/service fees aggregating up to (but not necessarily all of) 0.35% per annum of the average
    daily net assets attributable to Class A shares. Distribution expenses paid under this Plan, together with
    the initial sales charge, may cause long-term shareholders to pay more than the maximum sales charge that
    would have been permissible if imposed entirely as an initial sales charge. See "Information Concerning
    Shares of the Fund -- Distribution Plan" below.
(3) The Fund's Distribution Plan provides that it will pay distribution/ service fees aggregating up to (but not
    necessarily all of) 1.00% per annum of the average daily net assets attributable to Class B and Class C
    shares, respectively. Distribution expenses paid under the Distribution Plan, together with any CDSC payable
    upon redemption of Class B and Class C shares, may cause long-term shareholders to pay more than the maximum
    sales charge that would have been permissible if imposed entirely as an initial sales charge. See
    "Information Concerning Shares of the Fund -- Distribution Plan" below.
(4) The Adviser has agreed to bear the Fund's expenses attributable to Class A, Class B and Class C shares,
    subject to reimbursement by the Fund, such that "Other Expenses" do not exceed 0.20% per annum of the
    average daily net assets of each such class during the current fiscal year. Otherwise, "Other Expenses" on
    Class A, Class B and Class C shares are estimated to be 0.43% per annum and "Total Operating Expenses" on
    Class A, Class B and Class C shares are estimated to be 1.43%, 2.08% and 2.08% per annum, respectively. See
    "Information Concerning Shares of the Fund -- Expenses."
(5) The Fund has an expense offset arrangement which reduces the Fund's custodian fee based upon the amount of
    cash maintained by the Fund with its custodian and dividend disbursing agent, and may enter into other such
    arrangements and directed brokerage arrangements (which would also have the effect of reducing the Fund's
    expenses). Any such fee reductions are not reflected under "Other Expenses."
    
</TABLE>
                             EXAMPLE OF EXPENSES

An investor would pay the following dollar amounts of expenses on a $1,000
investment in the Fund, assuming (a) 5% annual return and (b) redemption at the
end of each of the time periods indicated (unless otherwise noted):

   
PERIOD          CLASS A               CLASS B                     CLASS C
- ------          -------     ----------------------------  ----------------------
                                               (1)                          (1)
 1 year  .....   $ 69            $ 59          $ 19           $ 29         $ 19
 3 years .....     93              88            58             58           58
- ------------
(1) Assumes no redemption.

The purpose of the expense table above is to assist investors in understanding
the various costs and expenses that a shareholder of the Fund will bear directly
or indirectly. More complete descriptions of the following expenses are set
forth in the following sections of this Prospectus: (i) varying sales charges on
share purchases -- "Purchases"; (ii) varying CDSCs -- "Purchases"; (iii)
management fee -- "Investment Adviser"; and (iv) Rule 12b-1 (i.e., distribution
plan) fees -- "Distribution Plan."
    

THE "EXAMPLE" SET FORTH ABOVE SHOULD NOT BE CONSIDERED A REPRESENTATION OF
FUTURE EXPENSES OF THE FUND; ACTUAL EXPENSES MAY BE GREATER OR LESS THAN THOSE
SHOWN.

   
2.  CONDENSED FINANCIAL INFORMATION
The following information has been audited (except for the six months ended
March 31, 1997) since the inception of the Fund and should be read in
conjunction with the financial statements included in the Fund's Annual Report
to shareholders and subsequent Semi-Annual Report to shareholders. The financial
statements contained therein are incorporated by reference into the SAI. The
financial statements (except for the six month period ended March 31, 1997) are
incorporated in reliance upon the report of the Fund's independent auditors,
given upon their authority, as experts in accounting and auditing. The Fund's
independent auditors are Deloitte & Touche LLP. This information is presented
for the Fund's Class I shares, which were first offered to the public on January
14, 1994. As discussed under "The Fund" below, Class I shares are offered by
means of a separate Prospectus supplement. The Fund's Class A, Class B and Class
C shares were not outstanding during the relevant periods.
    

                             FINANCIAL HIGHLIGHTS
                                CLASS I SHARES
<TABLE>
<CAPTION>
                                     SIX MONTHS ENDED      YEAR ENDED SEPTEMBER 30,       PERIOD ENDED
                                      MARCH 31, 1997      --------------------------      SEPTEMBER 30,
                                        (UNAUDITED)          1996           1995              1994*
- ------------------------------------------------------------------------------------------------------------
<S>                                          <C>               <C>            <C>               <C>   
PER SHARE DATA (FOR A SHARE OUTSTANDING
  THROUGHOUT EACH PERIOD):
Net asset value -- beginning of
  period ...........................         $13.85            $11.85         $ 9.64            $10.00
                                             ------            ------         ------            ------
Income from investment operations# --
  Net investment income(S) .........         $ 0.08            $ 0.18         $ 0.17            $ 0.12
  Net realized and unrealized gain
    (loss) on investments and
    foreign currency transactions ..           1.31              2.25           2.14             (0.48)
                                             ------            ------         ------            ------
    Total from investment operations         $ 1.39            $ 2.43         $ 2.31            $(0.36)
                                             ------            ------         ------            ------
Less distributions declared to
  shareholders --
  From net investment income .......         $(0.19)           $(0.15)        $(0.10)           $  --
  From net realized gain on
    investments ....................          (1.40)            (0.28)           --                --
                                             ------            ------         ------            ------
                                                                                                $
    Total distributions declared to
      shareholders .................         $(1.59)           $(0.43)        $(0.10)              --
                                             ------            ------         ------            ------
Net asset value -- end of period ...         $13.65            $13.85         $11.85            $ 9.64
                                             ======            ======         ======            ======
Total return .......................         10.09%++          20.96%         24.21%           (3.60)%
RATIOS (TO AVERAGE NET ASSETS)/
  SUPPLEMENTAL DATA(S):
  Expenses## .......................          1.00%+            1.00%          1.00%             1.00%+
  Net investment income ............          1.18%+            1.36%          1.58%             1.55%+
PORTFOLIO TURNOVER .................            27%               81%           125%               48%
AVERAGE COMMISSION RATE### .........        $0.0599           $0.0562            --                --
NET ASSETS AT END OF PERIOD (000
  OMITTED) .........................        $55,208           $49,318        $35,842           $22,184

  * For the period from the commencement of investment operations, January 14,
    1994, through September 30, 1994.
  + Annualized.
 ++ Not Annualized.
  # Per share data is based on average shares outstanding.
 ## For fiscal years ending after September 1, 1995, the Fund's expenses are calculated without reduction for fees paid
    indirectly.
### Average commission rate is calculated for funds with fiscal years beginning on or after September 1, 1995.
(S) The investment adviser voluntarily agreed to maintain the expenses of the Fund at not more than 1.00% of the Fund's
    average daily net assets. To the extent actual expenses were over/under this limitation, the net investment income per
    share and the ratios would have been:

    Net investment income ..........         $ 0.08            $ 0.18         $ 0.16            $ 0.07
    RATIOS (TO AVERAGE NET ASSETS):
      Expenses## ...................          0.99%+            1.03%          1.12%             1.64%+
      Net investment income ........          1.19%+            1.33%          1.49%             0.91%+
</TABLE>

3.  THE FUND
The Fund is a diversified series of the Trust, an open-end, investment
management company. The Fund invests in companies which meet certain labor
sensitivity criteria selected for inclusion in the LSI and may make economically
targeted investments. The Trust was organized as a business trust under the laws
of The Commonwealth of Massachusetts on September 1, 1993.

   
Three classes of shares of the Fund are currently offered for sale to the
general public. Class A shares are offered at net asset value plus an initial
sales charge up to a maximum of 5.75% of the offering price (or a CDSC of 1.00%
upon redemption during the first year in the case of certain purchases of $1
million or more and certain purchases by retirement plans) and are subject to an
annual distribution fee and service fee up to a maximum of 0.35% per annum.
Class B shares are offered at net asset value without an initial sales charge
but are subject to a CDSC upon redemption (declining from 4.00% during the first
year to 0% after six years) and an annual distribution fee and service fee up to
a maximum of 1.00% per annum. Class B shares will convert to Class A shares
approximately eight years after purchase. Class C shares are offered at net
asset value without an initial sales charge but are subject to a CDSC of 1.00%
upon redemption during the first year and an annual distribution fee and service
fee up to a maximum of 1.00% per annum. Class C shares do not convert to any
other class of shares of the Fund. In addition, the Fund offers an additional
class of shares, Class I shares, exclusively to certain institutional investors.
Class I shares are made available by means of a separate Prospectus Supplement
provided to institutional investors eligible to purchase Class I shares and are
offered at net asset value without an initial sales charge or CDSC upon
redemption and without an annual distribution and service fee.
    

The Fund's Board of Trustees provides broad supervision over the affairs of the
Fund. A majority of the Trustees of the Fund are not affiliated with the
Adviser. The Adviser is responsible for the management of the Fund's assets and
manages the Fund's portfolio from day to day in accordance with its investment
objective and policies. American Capital Strategies Ltd. ("ACS") administers the
LSI for MFS but has no responsibility for rendering investment advice to MFS or
to the Fund. The selection of investments and the way they are managed depend
upon the conditions and trends in the economy and the financial market places.
The Fund also offers to buy back (redeem) its shares from its shareholders at
any time at net asset value, less any applicable CDSC.

   
4.  LABOR SENSITIVITY INDEX
The LSI is a common stock index developed and maintained by ACS for use by the
Trust and represents the market weighted performance of common stocks of
companies which ACS and the Labor Advisory Board (as described below) determine
meet certain labor sensitivity criteria. The "Labor Sensitivity Index(SM)" and
the "LSI(SM)" are service marks of ACS. The LSI was established on the date the
Fund commenced investment operations (January 14, 1994) and, as of the date of
this Prospectus, is comprised of common stocks of approximately 550 companies
which meet certain quantitative and qualitative labor sensitivity criteria. The
criteria used in developing and maintaining the LSI involve the initial use of
quantitative guidelines and the subsequent use of qualitative guidelines applied
by ACS with the guidance of the Labor Advisory Board (the "Advisory Board"),
which is comprised of senior labor officials, senior managers of companies with
significant labor contracts, academics and other national labor leaders or
experts and has been established by ACS. The Advisory Board provides guidance to
ACS in the development, refinement and application of qualitative and
quantitative labor sensitivity criteria for the development and maintenance of
the LSI. MFS is not affiliated with ACS or the Advisory Board.

In selecting companies for inclusion in the LSI, ACS first compiles a list of
companies with labor agreements. The sources for this list include the research
departments of various international unions, publicly available documents and
government reports. ACS then applies quantitative guidelines which, as of the
date of this Prospectus, measure the degree to which a company's workforce is
unionized. At its discretion, ACS may vary from time to time the labor
sensitivity factors it considers or change the emphasis it places on any
specific factor.
    

After ACS has applied the quantitative guidelines, the list is then reviewed by
the Advisory Board, which assists in the application of qualitative guidelines
which take into account a number of labor sensitivity criteria. The qualitative
factors considered include, as of the date of this Prospectus, whether the
company is manufacturing or has manufactured products on the boycott list of the
AFL-CIO or certain other unions, whether the company is or has been involved in
strikes or lock-outs, and whether the company has demonstrated patterns of
non-compliance with applicable labor or health and safety laws. The Advisory
Board also considers patterns of outsourcing and associated plant closings,
patterns of strikes or lockouts, the degree to which a company's labor relations
vary throughout different divisions, subsidiaries, or parts of their company and
the extent of foreign ownership of a company with a unionized workforce, and
will vary from time to time. This list and any subsequent updates are supplied
to MFS by ACS. MFS will purchase, for the Fund's portfolio, securities of
companies included in the LSI in accordance with its investment objective and
policies, but is under no obligation to purchase any securities of particular
companies included in the LSI. The LSI is updated at least quarterly by ACS. See
"Management of the Fund -- Index Manager" and "-- Advisory Board" below.

Like the Standard & Poor's 500 Index (the "S&P 500"), the LSI is a market
capitalization weighted index and reflects the reinvestment of dividends paid on
the common stocks that comprise the LSI. However, unlike certain other stock
indices, such as the S&P 500, the LSI is not a recognized yardstick or
measurement of investment performance. Because of the criteria applied in the
selection of companies to be included in the LSI, the LSI may exclude entirely
or under- or over-weight particular industry sectors relative to other stock
indices such as the S&P 500. The performance of the LSI may not correlate with
the performance of such other indices, such as the S&P 500.

   
On January 14, 1994, the date that the Fund commenced investment operations, the
unit value of the LSI was established at 100, and as of June 30, 1997, the unit
value of the LSI was 192.22. The unit value of the LSI will be determined once
monthly as of the last day of each month. From time to time the Fund will
compare its total return for a given time period to the performance of the LSI
for the same time period. See "Investment Objective and Policies" and
"Information Concerning Shares of the Fund -- Performance Information" below.
The performance of the LSI shall be measured by comparing the unit value of the
LSI at the end of the time period to the unit value of the LSI at the beginning
of the time period.
    

The Fund intends to readjust its securities holdings periodically so that those
holdings will not include, to the extent reasonably practicable, the securities
of any company which has been eliminated from the LSI, however, the Fund is not
required to sell a security which has been eliminated from the LSI. The timing
and extent of adjustments in the holdings of the Fund will reflect the judgment
of MFS as to the appropriate balance as among the goal of excluding from its
portfolio the securities of any company which has been eliminated from the LSI,
the goal of seeking to achieve the Fund's investment objective and the goal of
minimizing transaction costs. The Fund is not managed by MFS with the objective
of correlating its holdings with the composition of the LSI, but rather of
investing in the securities of those companies contained in the LSI possessing
the best prospects for achieving the Fund's investment objective. The selection
of a company for investment by the Fund does not constitute an endorsement or
validation by the Fund or MFS of the criteria applied by ACS and the Advisory
Board in the development or maintenance of the LSI. ACS does not determine the
investment policies of the Fund or decide which securities of companies included
in the LSI the Fund will buy and sell.

Pursuant to a Proxy Services Agreement between ACS and the Trust, acting on
behalf of the Fund, ACS shall vote all proxies of companies included in the
Fund's portfolio consistent with proxy voting guidelines established by the
AFL-CIO, unless the Board of Trustees of the Trust directs otherwise. These
guidelines obligate ACS to make voting decisions consistent with the economic
best interests of shareholders of the Fund, and set forth considerations to be
taken into account by ACS with respect to certain types of proxy proposals.

5.  INVESTMENT OBJECTIVE AND POLICIES
INVESTMENT OBJECTIVE -- The investment objective of the Fund is to provide
long-term growth of capital. Any investment involves risk and there can be no
assurance that the Fund will achieve its investment objective.

INVESTMENT POLICIES -- The Fund seeks to achieve its investment objective by
investing, under normal market conditions, not less than 65% of its total assets
in equity securities of companies contained in the LSI, and may invest up to 35%
of its total assets in equity securities of companies which are not contained in
the LSI. The Fund's policy is to invest a substantial proportion of its assets
in equity securities of companies believed by the Adviser to possess
opportunities for long-term capital growth with emphasis on progressive,
well-managed companies.

Up to 10% of the Fund's total assets may be invested in equity securities where
such investment is consistent with an economically targeted investment strategy.
An economically targeted investment ("ETI") is an investment designed to produce
a competitive return as measured against the Fund's other investments, as well
as to create collateral economic benefits for a targeted geographical area,
group of people or sector of the economy. Such collateral economic benefits may
include, for example, expanding employment opportunities, increasing the
availability of affordable housing, building or improving schools, health care
facilities or infrastructure, assisting minority- or women-owned businesses,
developing alternative energy systems, reducing pollution and increasing the tax
base. The Fund's ETI strategy is subject to its limitation on investments in
restricted securities. See "Investment Techniques -- Restricted Securities"
below.

The Fund generally expects to be fully invested in equity securities of
companies contained in the LSI and ETI investments, except for cash and cash
equivalent investments and the investments and investment techniques described
below.

While it is not generally the Fund's policy to invest or trade for short-term
profits, the Fund may dispose of a portfolio security whenever MFS is of the
opinion that such security no longer has an appropriate appreciation potential
or when another security appears to offer relatively greater appreciation
potential. Subject to tax requirements, portfolio changes are made without
regard to the length of time a security has been held, or whether a sale would
result in a profit or loss. See "Investment Techniques -- Portfolio Trading"
below.

Although changes in the value of securities subsequent to their acquisition are
reflected in the net asset value of shares of the Fund, such changes may not
affect the income received by the Fund from such securities. However, the
dividends paid by the Fund, if any, will increase or decrease in relation to the
income received by the Fund from its investments, which would in any case be
reduced by the Fund's expenses before it is distributed to shareholders.

   
In addition, the use of options, futures contracts and options on futures
contracts may result in the loss of principal, particularly where such
instruments are traded for other than hedging purposes. See "Investment
Techniques" below.

6.  INVESTMENT TECHNIQUES
Additional information about certain of the investment techniques described
below can be found under the caption "Investment Objectives, Policies and
Restrictions" in the SAI.

EQUITY SECURITIES: The Fund may invest in all types of equity securities,
including the following: common stocks, preferred stocks and preference stocks;
securities such as bonds, warrants or rights that are convertible into stocks;
and depository receipts for those securities. These securities may be listed on
securities exchanges, traded in various over-the-counter markets or have no
organized markets.

SHORT-TERM INVESTMENTS: The Fund may invest in cash or cash equivalents
including, but not limited to, obligations of banks (including certificates of
deposit, bankers' acceptances and repurchase agreements) with assets of $1
billion or more, commercial paper, short-term notes, U.S. Government securities
and related repurchase agreements. U.S. Government securities also include
interests in trusts or other entities representing interests in obligations that
are issued or guaranteed by the U.S. Government, its agencies, authorities or
instrumentalities. During periods of unusual market conditions when MFS believes
that investing for temporary defensive purposes is appropriate, or in order to
meet anticipated redemption requests, a large portion or all of the assets of
the Fund may be invested in cash or cash equivalents.
    

LENDING OF SECURITIES: The Fund may make loans of its portfolio securities. Such
loans will usually be made only to member banks of the Federal Reserve System
and member firms (and subsidiaries thereof) of the New York Stock Exchange (the
"Exchange") and would be required to be secured continuously by collateral in
cash, U.S. Government securities or an irrevocable letter of credit maintained
on a current basis at an amount at least equal to the market value of the
securities loaned. The Fund would continue to collect the equivalent of the
interest on the securities loaned and would also receive either interest
(through investment of cash collateral) or a fee (if the collateral is U.S.
Government securities or a letter of credit). The value of securities loaned
will not exceed 30% of the value of the Fund's total assets.

   
REPURCHASE AGREEMENTS: The Fund may enter into repurchase agreements in order to
earn income on available cash or as a temporary defensive measure. Under a
repurchase agreement, a Fund acquires securities subject to the seller's
agreement to repurchase at a specified time and price. If the seller becomes
subject to a proceeding under the bankruptcy laws or its assets are otherwise
subject to a stay order, the Fund's right to liquidate the securities may be
restricted (during which time the value of the securities could decline). As
discussed in the SAI, the Fund has adopted certain procedures which are intended
to minimize risk.

WHEN-ISSUED SECURITIES: In order to help ensure the availability of suitable
securities for its portfolio, the Fund may purchase securities on a "when-
issued" or on a "forward delivery" basis, which means that the obligations will
be delivered to the Fund at a future date usually beyond customary settlement
time. It is expected that, under normal circumstances, the Fund will take
delivery of such securities. In general, the Fund does not pay for the
securities until received and does not start earning interest on the obligations
until the contractual settlement date. While awaiting delivery of the
obligations purchased on such bases, the Fund will establish a segregated
account consisting of liquid assets equal to the amount of the commitments to
purchase "when-issued" securities.
    

RESTRICTED SECURITIES: The Fund may also purchase securities that are not
registered under the Securities Act of 1933 ("1933 Act") ("restricted
securities"), including those that can be offered and sold to "qualified
institutional buyers" under Rule 144A under the 1933 Act ("Rule 144A
securities"). A determination is made, based upon a continuing review of the
trading markets for a specific Rule 144A security, whether such security is
liquid and thus not subject to the Fund's limitation on investing not more than
15% of its net assets in illiquid investments. The Board of Trustees has adopted
guidelines and delegated to MFS the daily function of determining and monitoring
the liquidity of Rule 144A securities. The Board, however, retains oversight,
focusing on factors such as valuation, liquidity and availability of
information. Investing in Rule 144A securities could have the effect of
decreasing the level of liquidity in the Fund to the extent that qualified
institutional buyers become for a time uninterested in purchasing Rule 144A
securities held in the Fund's portfolio. Subject to the Fund's 15% limitation on
investments in illiquid investments, the Fund may also invest in restricted
securities that may not be sold under Rule 144A, which presents certain risks.
As a result, the Fund might not be able to sell those securities when the
Adviser wishes to do so, or might have to sell them at less than fair value. In
addition, market quotations are less readily available. Therefore, judgment may
at times play a greater role in valuing these securities than in the case of
unrestricted securities.

   
TRANSACTIONS IN OPTIONS AND FUTURES CONTRACTS: The Fund may enter into
transactions in options and futures contracts on a variety of instruments and
indices, in order to protect against declines in the value of portfolio
securities or increases in the cost of securities or other assets to be acquired
and, subject to applicable law, to increase the Fund's gross income.

OPTIONS
    

OPTIONS ON SECURITIES -- The Fund may write (sell) covered call and put options
and purchase call and put options on securities. The Fund will write options on
securities for the purpose of increasing its return on such securities and/or to
protect the value of its portfolio. In particular, where the Fund writes an
option which expires unexercised or is closed out by the Fund at a profit, it
will retain the premium paid for the option which will increase its gross income
and will offset in part the reduced value of the portfolio security underlying
the option, or the increased cost of portfolio securities to be acquired.
However, the writing of options constitutes only a partial hedge, up to the
amount of the premium, less any transaction costs. In contrast, however, if the
price of the underlying security moves adversely to the Fund's position, the
option may be exercised and the Fund will be required to purchase or sell the
underlying security at a disadvantageous price, resulting in losses which may
only be partially offset by the amount of the premium. The Fund may also write
combinations of put and call options on the same security, known as "straddles."
Such transactions can generate additional premium income but also present
increased risk.

By writing a call option on a security, the Fund limits its opportunity to
profit from any increase in the market value of the underlying security, since
the holder will usually exercise the call option when the market value of the
underlying security exceeds the exercise price of the call. However, the Fund
retains the risk of depreciation in value of securities on which it has written
call options.

The Fund may also purchase put or call options in anticipation of market
fluctuations which may adversely affect the value of its portfolio or the prices
of securities that the Fund wants to purchase at a later date. In the event that
the expected market fluctuations occur, the Fund may be able to offset the
resulting adverse effect on its portfolio, in whole or in part, through the
options purchased. The premium paid for a put or call option plus any
transaction costs will reduce the benefit, if any, realized by the Fund upon
exercise or liquidation of the option, and, unless the price of the underlying
security changes sufficiently, the option may expire without value to the Fund.

OPTIONS ON STOCK INDICES -- The Fund may write (sell) covered call and put
options and purchase call and put options on stock indices. The Fund may write
options on stock indices for the purpose of increasing its gross income and to
protect its portfolio against declines in the value of securities it owns or
increases in the value of securities to be acquired. When the Fund writes an
option on a stock index, and the value of the index moves adversely to the
holder's position, the option will not be exercised, and the Fund will either
close out the option at a profit or allow it to expire unexercised. The Fund
will thereby retain the amount of the premium, less related transaction costs,
which will increase its gross income and offset part of the reduced value of
portfolio securities or the increased cost of securities to be acquired. Such
transactions, however, will constitute only partial hedges against adverse price
fluctuations, since any such fluctuations will be offset only to the extent of
the premium received by the Fund for the writing of the option, less related
transaction costs. In addition, if the value of an underlying index moves
adversely to the Fund's option position, the option may be exercised, and the
Fund will experience a loss which may only be partially offset by the amount of
the premium received.

The Fund may also purchase put or call options on stock indices in order,
respectively, to hedge its investments against a decline in value or to attempt
to reduce the risk of missing a market or industry segment advance. The Fund's
possible loss in either case will be limited to the premium paid for the option,
plus related transaction costs.

FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS

FUTURES CONTRACTS -- The Fund may purchase and sell futures contracts on stock
indices ("Futures Contracts"). The Fund will utilize Futures Contracts for
hedging and non-hedging purposes, subject to applicable law. For example,
purchases or sales of stock index futures contracts for hedging purposes are
used to attempt to protect the Fund's current or intended stock investments from
broad fluctuations in stock prices. In the event that an anticipated decrease in
the value of portfolio securities occurs as a result of a general stock market
decline or a general increase in interest rates, the adverse effects of such
changes may be offset, in whole or part, by gains on the sale of such Futures
Contracts. Conversely, the increased cost of portfolio securities to be
acquired, caused by a general rise in the stock market or a general decline in
interest rates may be offset, in whole or in part, by gains on stock index
futures contracts purchased by the Fund. The Fund will incur brokerage fees when
it purchases and sells Futures Contracts, and it will be required to make and
maintain margin deposits.

OPTIONS ON FUTURES CONTRACTS -- The Fund may purchase and write options on
Futures Contracts ("Options on Futures Contracts"). Such investment strategies
will be used for hedging and non-hedging purposes, subject to applicable law.
Put and call Options on Futures Contracts may be traded by the Fund in order to
protect against declines in the values of portfolio securities or against
increases in the cost of securities to be acquired. Purchases of Options on
Futures Contracts may present less risk in hedging the portfolio of the Fund
than the purchase or sale of the underlying Futures Contracts since the
potential loss is limited to the amount of the premium plus related transaction
costs. The writing of such Options, however, does not present less risk than the
trading of Futures Contracts and will constitute only a partial hedge, up to the
amount of the premium received. In addition, if an option is exercised, the Fund
may suffer a loss on the transaction.

RISKS OF TRANSACTIONS IN OPTIONS AND FUTURES CONTRACTS: Although the Fund will
enter into certain transactions in Futures Contracts, Options on Futures
Contracts and options for hedging purposes, such transactions do involve certain
risks. For example, a lack of correlation between the index or instrument
underlying an option or Futures Contract and the assets being hedged, or
unexpected adverse price movements, could render the Fund's hedging strategy
unsuccessful and could result in losses. "Cross hedging" transactions may
involve greater correlation risks. In addition, there can be no assurance that a
liquid secondary market will exist for any contract purchased or sold, and the
Fund may be required to maintain a position until exercise or expiration, which
could result in losses. As noted, the Fund may also enter into transactions in
such instruments for other than hedging purposes (subject to applicable law),
including speculative transactions, which involve greater risk. In particular,
in entering into such transactions, the Fund may experience losses which are not
offset by gains on other portfolio positions, thereby reducing its gross income.
In addition, the markets for such instruments may be extremely volatile from
time to time, as discussed in the SAI, which could increase the risks incurred
by the Fund in entering into such transactions.

Transactions in options may be entered into on U.S. exchanges regulated by the
SEC and in the over-the-counter market. Futures Contracts and Options on
Futures Contracts may be entered into on U.S. exchanges regulated by the
Commodity Futures Trading Commission (the "CFTC").

   
Transactions in options, Futures Contracts and Options on Futures Contracts
entered into for non-hedging purposes involve greater risk and could result in
losses which are not offset by gains on other portfolio assets. For example, the
Fund may sell Futures Contracts on an index of securities in order to profit
from any anticipated decline in the value of the securities comprising the
underlying index. In such instances, any losses on the Futures Contract will not
be offset by gains on an portfolio securities comprising such index, as might
occur in connection with a hedging transaction.

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

PORTFOLIO TRADING
The Fund intends to manage its portfolio by buying and selling securities in
accordance with its investment objective and policies. The Fund will engage in
portfolio trading if it believes a transaction, net of costs (including
custodian charges), will help in attaining its investment objective. For a
description of the strategies which may be used by the Fund in trading portfolio
securities, see "Portfolio Transactions and Brokerage Commissions" in the SAI.

The primary consideration in placing portfolio security transactions with
broker-dealers for execution is to obtain, and maintain the availability of,
execution at the most favorable prices and in the most effective manner
possible. Consistent with the foregoing primary consideration, the Conduct
Rules of the National Association of Securities Dealers, Inc. and such other
policies as the Trustees may determine, MFS may consider sales of shares of
investment company clients of MFD as a factor in the selection of broker-
dealers to execute the Fund's portfolio transactions. For a further discussion
of portfolio trading, see the SAI.

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

   
The SAI includes a discussion of other investment policies and techniques and a
listing of specific investment restrictions which govern the Fund's investment
policies. Certain investment restrictions listed in the SAI may be changed
without shareholder approval unless indicated otherwise (see "Investment
Restrictions" in the SAI). Except with respect to the Fund's policy on borrowing
and investing in illiquid securities, the Fund's investment limitations and
policies are adhered to at the time of purchase or utilization of assets; a
subsequent change in circumstances will not be considered to result in a
violation of policy.

7.  MANAGEMENT OF THE FUND
INVESTMENT ADVISER -- MFS manages the Fund pursuant to an Investment Advisory
Agreement dated December 8, 1993 (the "Advisory Agreement") with the Trust on
behalf of the Fund. Under the Advisory Agreement, MFS provides the Fund with
overall investment advisory services. Mitch Dynan is the portfolio manager of
the Fund. Mr. Dynan, a Vice President of the Adviser, has been employed as a
portfolio manager with the Adviser since June 1986 and has managed the Fund
since March 1, 1997. Subject to such policies as the Trustees may determine, MFS
makes investment decisions for the Fund. For its services and facilities, MFS
receives a management fee, computed and paid monthly, in an amount equal to
0.65% per annum of the average daily net assets of the Fund. For the fiscal year
ended September 30, 1996, MFS received fees under the Advisory Agreement of
$310,911.
    

MFS also serves as investment adviser to each of the other funds in the MFS
Family of Funds (the "MFS Funds") and to MFS Municipal Income Trust, MFS
Multimarket Income Trust, MFS Government Markets Income Trust, MFS Intermediate
Income Trust, MFS Charter Income Trust, MFS Special Value Trust, MFS Union
Standard Trust, MFS Institutional Trust, MFS Variable Insurance Trust, MFS/Sun
Life Series Trust and seven variable accounts, each of which is a registered
investment company established by Sun Life Assurance Company of Canada (U.S.)
("Sun Life of Canada (U.S.)") in connection with the sale of various
fixed/variable annuity contracts. MFS and its wholly owned subsidiary, MFS
Institutional Advisors, Inc., provide investment advice to substantial private
clients.

   
MFS is America's oldest mutual fund organization. MFS and its predecessor
organizations have a history of money management dating from 1924 and the
founding of the first mutual fund in the United States, Massachusetts Investors
Trust. Net assets under management of the MFS organization were approximately
$60.38 billion on behalf of approximately 2.6 million investor accounts as of
June 30, 1997. As of such date, the MFS organization managed approximately $36.5
billion of assets in equity securities and approximately $19.6 billion in fixed
income portfolios and fixed income portfolios of MFS Institutional Advisors,
Inc. Approximately $4.1 billion of the assets managed by MFS are invested in
securities of foreign issuers and non-U.S. dollar denominated securities of U.S.
issuers. MFS is a subsidiary of Sun Life of Canada (U.S.), a subsidiary of Sun
Life of Canada (U.S.) Holdings, Inc., which in turn is a wholly owned subsidiary
of Sun Life Assurance Company of Canada ("Sun Life"). The Directors of MFS are
A. Keith Brodkin, Jeffrey L. Shames, Arnold D. Scott, John D. McNeil and Donald
A. Stewart. Mr. Brodkin is the Chairman, Mr. Shames is the President and Mr.
Scott is the Secretary and a Senior Executive Vice President, of MFS. Messrs.
McNeil and Stewart are the Chairman and the President, respectively, of Sun
Life. Sun Life, a mutual life insurance company, is one of the largest
international life insurance companies and has been operating in the United
States since 1895, establishing a headquarters here in 1973. The executive
officers of MFS report to the Chairman of Sun Life.

A. Keith Brodkin, the Chairman and a Director of MFS, is the Chairman,
President and a  Trustee of the Fund. W. Thomas London, James O. Yost, Ellen
M. Moynihan, Mark E. Bradley, Stephen E. Cavan, and James R. Bordewick, Jr.,
all of whom are officers of MFS, are officers of the Fund.
    

MFS has established a strategic alliance with Foreign & Colonial Management Ltd.
("Foreign & Colonial"). Foreign & Colonial is a subsidiary of two of the world's
oldest financial services institutions, the London-based Foreign & Colonial
Investment Trust PLC, which pioneered the idea of investment management in 1868,
and HYPO-BANK (Bayerische Hypotheken-und Wechsel-Bank AG), the oldest publicly
listed bank in Germany, founded in 1835. As part of this alliance, the portfolio
managers and investment analysts of MFS and Foreign & Colonial share their views
on a variety of investment related issues, such as the economy, securities
markets, portfolio securities and their issuers, investment recommendations,
strategies and techniques, risk analysis, trading strategies and other portfolio
management matters. MFS has access to the extensive international equity
investment expertise of Foreign & Colonial, and Foreign & Colonial has access to
the extensive U.S. equity investment expertise of MFS. MFS and Foreign &
Colonial each have investment personnel working in each other's offices in
Boston and London, respectively.

In certain instances there may be securities which are suitable for the Fund's
portfolio as well as for portfolios of other clients of MFS or clients of
Foreign & Colonial. Some simultaneous transactions are inevitable when several
clients receive investment advice from MFS and Foreign & Colonial, particularly
when the same security is suitable for more than one client. While in some cases
this arrangement could have a detrimental effect on the price or availability of
the security as far as the Fund is concerned, in other cases, however, it may
produce increased investment opportunities for the Fund.

   
ADMINISTRATOR -- MFS provides the Fund with certain financial, legal,
compliance, shareholder communications and other administrative services
pursuant to a Master Administrative Services Agreement dated March 1, 1997.
Under this Agreement, the Fund pays MFS an administrative fee of up to 0.015%
per annum of the Fund's average daily net assets. This fee reimburses MFS for a
portion of the costs it incurs to provide such services.
    

DISTRIBUTOR -- MFD, a wholly owned subsidiary of MFS, is the distributor of
shares of the Fund and also serves as distributor for each of the other MFS
Funds.

SHAREHOLDER SERVICING AGENT -- MFS Service Center, Inc. (the "Shareholder
Servicing Agent"), a wholly owned subsidiary of MFS, performs transfer agency,
certain dividend disbursing agency and other services for the Fund.

INDEX MANAGER -- ACS, a Maryland corporation with offices at 3 Bethesda Metro
Center, Bethesda, Maryland 20814, develops, maintains and furnishes to MFS the
LSI pursuant to an agreement between MFS and ACS. Under this agreement, MFS pays
ACS a fee equal to 0.05% per annum, payable quarterly, of the aggregate average
daily net assets of the Fund, with a minimum quarterly fee of $82,500.

ADVISORY BOARD -- The Advisory Board, established by ACS, assists in the
development and maintenance of the LSI by applying qualitative labor sensitivity
criteria and assisting ACS in developing and refining quantitative labor
sensitivity criteria applied by ACS. The Advisory Board is comprised of senior
labor officials, senior managers of companies with significant labor contracts,
academics and other national labor leaders or experts.

   
8.  INFORMATION CONCERNING SHARES OF THE FUND
PURCHASES
Class A, Class B and Class C shares of the Fund may be purchased at the public
offering price through any dealer. As used in the Prospectus and any appendices
thereto the term "dealer" includes any broker, dealer, bank (including bank
trust departments), registered investment adviser, financial planner and any
other financial institutions having a selling agreement or other similar
agreement with MFD. Dealers may also charge their customers fees relating to
investments in the Fund.

This Prospectus offers Class A, Class B and Class C shares to the general public
which bear sales charges and distribution fees in different forms and amounts,
as described below:
    

CLASS A SHARES: Class A shares are generally offered at net asset value plus an
initial sales charge, but in certain cases are offered at net asset value
without an initial sales charge but subject to a CDSC.

    PURCHASES SUBJECT TO INITIAL SALES CHARGE. Class A shares are offered at
net asset value plus an initial sales charge as follows:

                                       SALES CHARGE* AS
                                        PERCENTAGE OF:
                                 ---------------------------   DEALER ALLOWANCE
                                                  NET AMOUNT    AS A PERCENTAGE
AMOUNT OF PURCHASE               OFFERING PRICE    INVESTED    OF OFFERING PRICE
- ------------------               --------------    --------    -----------------
Less than $50,000 ...............     5.75%          6.10%            5.00%
$50,000 but less than $100,000 ..     4.75           4.99             4.00
$100,000 but less than $250,000 .     4.00           4.17             3.20
$250,000 but less than $500,000 .     2.95           3.04             2.25
$500,000 but less than $1,000,000     2.20           2.25             1.75
$1,000,000 or more ..............     None**         None**        See Below**
- ------------
 * Because of rounding in the calculation of offering price, actual sales 
   charges may be more or less than those calculated using the percentages 
   above.
** A CDSC will apply to such purchases, as discussed below.

MFD allows discounts to dealers (which are alike for all dealers) from the
applicable public offering price, as shown in the above table. In the case of
the maximum sales charge, the dealer retains 5% and MFD retains approximately
3/4 of 1% of the public offering price. The sales charge may vary depending on
the number of shares of the Fund as well as certain other MFS Funds owned or
being purchased, the existence of an agreement to purchase additional shares
during a 13-month period (or 36-month period for purchases of $1 million or
more) or other special purchase programs. A description of the Right of
Accumulation, Letter of Intent and Group Purchase privileges by which the sales
charge may be reduced is set forth in the SAI.

    PURCHASES SUBJECT TO A CDSC (but not subject to an initial sales charge). In
the following five circumstances, Class A shares are offered at net asset value
without an initial sales charge but subject to a CDSC, equal to 1% of the lesser
of the value of the shares redeemed (exclusive of reinvested dividend and
capital gain distributions) or the total cost of such shares, in the event of a
share redemption within 12 months following the purchase:

    (i) on investments of $1 million or more in Class A shares;

    (ii) on investments in Class A shares by certain retirement plans subject to
    the Employee Retirement Income Security Act of 1974, as amended ("ERISA"),
    if, prior to July 1, 1996: (a) the Plan had established an account with the
    Shareholder Servicing Agent and (b) the sponsoring organization had
    demonstrated to the satisfaction of MFD that either (i) the employer had at
    least 25 employees or (ii) the aggregate purchases by the retirement plan of
    Class A shares of the MFS Funds would be in an amount of at least $250,000
    within a reasonable period of time, as determined by MFD in its sole
    discretion;

   
    (iii) on investments in Class A shares by certain retirement plans subject
    to ERISA, if: (a) the retirement plan and/or sponsoring organization
    subscribes to the MFS FUNDamental 401(k) Program or any similar
    recordkeeping system made available by the Shareholder Servicing Agent (the
    "MFS Participant Recordkeeping System"); (b) the plan established an account
    with the Shareholder Servicing Agent on or after July 1, 1996; and (c) the
    aggregate purchases by the retirement plan of Class A shares of the MFS
    Funds will be in an aggregate amount of at least $500,000 within a
    reasonable period of time, as determined by MFD in its sole discretion;

    (iv) on investments in Class A shares by certain retirement plans subject to
    ERISA, if: (a) the plan established an account with the Shareholder
    Servicing Agent on or after July 1, 1996 and (b) the plan has, at the time
    of purchase, a market value of $500,000 or more invested in shares of any
    class or classes of the MFS Funds. THE RETIREMENT PLAN WILL QUALIFY UNDER
    THIS CATEGORY ONLY IF THE PLAN OR ITS SPONSORING ORGANIZATION INFORMS THE
    SHAREHOLDER SERVICING AGENT PRIOR TO THE PURCHASES THAT THE PLAN HAS A
    MARKET VALUE OF $500,000 OR MORE INVESTED IN SHARES OF ANY CLASS OR CLASSES
    OF THE MFS FUNDS. THE SHAREHOLDER SERVICING AGENT HAS NO OBLIGATION
    INDEPENDENTLY TO DETERMINE WHETHER SUCH A PLAN QUALIFIES UNDER THIS
    CATEGORY; AND

    (v) on investments in Class A shares by certain retirement plans subject to
    ERISA; if: (a) the plan establishes an account with the Shareholder
    Servicing Agent on or after July 1, 1997; (b) such plans's records are
    maintained on a pooled basis by the Shareholder Servicing Agent; and (c) the
    sponsoring organization demonstrates to the satisfaction of MFD that, at the
    time of purchase, the employer has at least 200 eligible employees and the
    plan has aggregate assets of at least $2,000,000.

In the case of such purchases, MFD will pay commissions to dealers on new
investments in Class A shares made through such dealers as follows:
    

        COMMISSION PAID
            BY MFD
          TO DEALERS          CUMULATIVE PURCHASE AMOUNT
          ----------          --------------------------
            1.00%             On the first $2,000,000, plus
            0.80%             Over $2,000,000 to $3,000,000, plus
            0.50%             Over $3,000,000 to $50,000,000, plus
            0.25%             Over $50,000,000

For purposes of determining the level of commissions to be paid to dealers with
respect to a shareholder's new investment in Class A shares, purchases for each
shareholder account (and certain other accounts for which the shareholder is a
record or beneficial holder) will be aggregated over a 12- month period
(commencing from the date of the first such purchase).

See "Redemptions and Repurchases -- Contingent Deferred Sales Charge" for
further discussion of the CDSC.

    WAIVERS OF INITIAL SALES CHARGE AND CDSC. In certain circumstances, the
initial sales charge imposed upon purchases of Class A shares and the CDSC
imposed upon redemptions of Class A shares is waived. These circumstances are
described in Appendix A to this Prospectus. In addition to these circumstances,
the CDSC imposed upon the redemption of Class A shares is waived with respect to
shares held by certain retirement plans qualified under Section 401(a) or 403(b)
of the Internal Revenue Code of 1986, as amended (the "Code"), and subject to
ERISA, where:

    (i) the retirement plan and/or sponsoring organization does not subscribe
    to the MFS Participant Recordkeeping System; and

    (ii) the retirement plan and/or sponsoring organization demonstrates to the
    satisfaction of, and certifies to the Shareholder Servicing Agent that the
    retirement plan has, at the time of certification or will have pursuant to a
    purchase order placed with the certification, a market value of $500,000 or
    more invested in shares of any class or classes of the MFS Funds and
    aggregate assets of at least $10 million;

provided, however, that the CDSC will not be waived (i.e., it will be imposed)
in the event that there is a change in law or regulations which results in a
material adverse change to the tax advantaged nature of the plan, or in the
event that the plan and/or sponsoring organization: (i) becomes insolvent or
bankrupt; (ii) is terminated or partially terminated under ERISA or is
liquidated or dissolved; or (iii) is acquired by, merged into, or consolidated
with, any other entity.

CLASS B SHARES: Class B shares are offered at net asset value without an initial
sales charge but subject to a CDSC upon redemption as follows:

     YEAR OF                                                    CONTINGENT
    REDEMPTION                                                DEFERRED SALES
  AFTER PURCHASE                                                  CHARGE
  --------------                                                  ------
First ..................................................            4%
Second .................................................            4%
Third ..................................................            3%
Fourth .................................................            3%
Fifth ..................................................            2%
Sixth ..................................................            1%
Seventh and following ..................................            0%

The CDSC imposed is assessed against the lesser of the value of the shares
redeemed (exclusive of reinvested dividends and capital gain distributions) or
the total cost of such shares. No CDSC is assessed against shares acquired
through the automatic reinvestment of dividends or capital gain distributions.
See "Redemptions and Repurchases -- Contingent Deferred Sales Charge" for
further discussion of the CDSC.

Except as described below, MFD will pay commissions to dealers of 3.75% of the
purchase price of Class B shares purchased through dealers. MFD will also
advance to dealers the first year service fee payable under the Fund's
Distribution Plan (see "Distribution Plan" below) at a rate equal to 0.25% of
the purchase price of such shares. Therefore, the total amount paid to a dealer
upon the sale of Class B shares is 4% of the purchase price of the shares
(commission rate of 3.75% plus a service fee equal to 0.25% of the purchase
price).

Class B shares purchased by a retirement plan whose sponsoring organization
subscribes to the MFS Participant Recordkeeping System and which has established
its account with the Shareholder Servicing Agent on or after July 1, 1996 will
be subject to the CDSC described above, only under limited circumstances, as
explained below under "Waivers of CDSC." With respect to such purchases, MFD
pays an amount to dealers equal to 3.00% of the amount purchased through such
dealers (rather than the 4.00% payment described above), which is comprised of a
commission of 2.75% plus the advancement of the first year service fee equal to
0.25% of the purchase price payable under the Fund's Distribution Plan. As
discussed above, such retirement plans are eligible to purchase Class A shares
of the Fund at net asset value without an initial sales charge but subject to a
1% CDSC if the plan has, at the time of purchase, a market value of $500,000 or
more invested in shares of any class or classes of the MFS Funds. IN THIS EVENT,
THE PLAN OR ITS SPONSORING ORGANIZATION SHOULD INFORM THE SHAREHOLDER SERVICING
AGENT THAT THE PLAN IS ELIGIBLE TO PURCHASE CLASS A SHARES UNDER THIS CATEGORY;
THE SHAREHOLDER SERVICING AGENT HAS NO OBLIGATION INDEPENDENTLY TO DETERMINE
WHETHER SUCH A PLAN QUALIFIES UNDER THIS CATEGORY FOR THE PURCHASE OF CLASS A
SHARES.

    WAIVERS OF CDSC. In certain circumstances, the CDSC imposed upon redemption
of Class B shares is waived. These circumstances are described in Appendix A to
this Prospectus. In addition to these circumstances, the CDSC imposed upon the
redemption of Class B shares is waived with respect to shares held by a
retirement plan whose sponsoring organization subscribes to the MFS Participant
Recordkeeping System and which has established an account with the Shareholder
Servicing Agent on or after July 1, 1996; provided, however, that the CDSC will
not be waived (i.e., it will be imposed) in the event that there is a change in
law or regulations which results in a material adverse change to the tax
advantaged nature of the plan, or in the event that the plan and/or sponsoring
organization: (i) becomes insolvent or bankrupt; (ii) is terminated or partially
terminated under ERISA or is liquidated or dissolved; or (iii) is acquired by,
merged into, or consolidated with, any other entity.

    CONVERSION OF CLASS B SHARES. Class B shares of the Fund that remain
outstanding for approximately eight years will convert to Class A shares of the
Fund. Shares purchased through the reinvestment of distributions paid in respect
of Class B shares will be treated as Class B shares for purposes of the payment
of the distribution and service fees under the Fund's Distribution Plan. See
"Distribution Plan" below. However, for purposes of conversion to Class A
shares, all shares in a shareholder's account that were purchased through the
reinvestment of dividends and distributions paid in respect of Class B shares
(and which have not converted to Class A shares as provided in the following
sentence) will be held in a separate sub-account. Each time any Class B shares
in the shareholder's account (other than those in the sub-account) convert to
Class A shares, a portion of the Class B shares then in the sub-account will
also convert to Class A shares. The portion will be determined by the ratio that
the shareholder's Class B shares not acquired through reinvestment of dividends
and distributions that are converting to Class A shares bears to the
shareholder's total Class B shares not acquired through reinvestment. The
conversion of Class B shares to Class A shares is subject to the continuing
availability of a ruling from the Internal Revenue Service or an opinion of
counsel that such conversion will not constitute a taxable event for federal tax
purposes. There can be no assurance that such ruling or opinion will be
available, and the conversion of Class B shares to Class A shares will not occur
if such ruling or opinion is not available. In such event, Class B shares would
continue to be subject to higher expenses than Class A shares for an indefinite
period.

CLASS C SHARES: Class C shares are offered at net asset value without an initial
sales charge but are subject to a CDSC upon redemption of 1.00% during the first
year. Class C shares do not convert to any other class of shares of the Fund.
The maximum investment in Class C shares that may be made is $1,000,000 per
transaction.

The CDSC imposed is assessed against the lesser of the value of the shares
redeemed (exclusive of reinvested dividend and capital gain distributions) or
the total cost of such shares. No CDSC is assessed against shares acquired
through the automatic reinvestment of dividend or capital gain distributions.
See "Redemptions and Repurchases -- Contingent Deferred Sales Charge" below
for further discussion of the CDSC.

MFD will pay dealers 1.00% of the purchase price of Class C shares purchased
through dealers and, as compensation therefor, MFD will retain the 1.00% per
annum distribution and service fee paid under the Fund's Distribution Plan by
the Fund to MFD for the first year after purchase (see "Distribution Plan"
below).

Class C shares are not currently available for purchase by any retirement plan
qualified under Sections 401(a) or 403(b) of the Internal Revenue Code of 1986,
as amended (the "Code"), if the retirement plan and/or the sponsoring
organization subscribe to the MFS FUNDamental 401(k) Plan or another similar
recordkeeping program made available by the Shareholder Servicing Agent.

WAIVERS OF CDSC.  In certain circumstances, the CDSC imposed upon redemption
of Class C shares is waived. These circumstances are described in Appendix A
to this Prospectus.

GENERAL: The following information applies to purchases of all classes of the
Fund's shares.

    MINIMUM INVESTMENT. Except as described below, the minimum initial
investment is $1,000 per account and the minimum additional investment is $50
per account. Accounts being established for monthly automatic investments and
under payroll savings programs and tax-deferred retirement programs (other than
IRAs) involving the submission of investments by means of group remittal
statements are subject to a $50 minimum on initial and additional investments
per account. The minimum initial investment for IRAs is $250 per account and the
minimum additional investment is $50 per account. Accounts being established for
participation in the Automatic Exchange Plan are subject to a $50 minimum on
initial and additional investments per account. There are also other limited
exceptions to these minimums for certain tax-deferred retirement programs. Any
minimums may be changed at any time at the discretion of MFD. The Fund reserves
the right to cease offering its shares at any time.

   
    SUBSEQUENT INVESTMENT BY TELEPHONE. Each shareholder may purchase additional
shares of any MFS Fund by telephoning the Shareholder Servicing Agent toll-free
at (800) 225-2606. The minimum purchase amount is $50 and the maximum purchase
amount is $100,000. Shareholders wishing to avail themselves of this telephone
purchase privilege must so elect on their Account Application and designate
thereon a bank and account number from which purchases will be made. If a
telephone purchase request is received by the Shareholder Servicing Agent on any
business day prior to the close of regular trading on the Exchange (generally,
4:00 p.m., Eastern time), the purchase will occur at the closing net asset value
of the shares purchased on that day. The Shareholder Servicing Agent may be
liable for any losses resulting from unauthorized telephone transactions if it
does not follow reasonable procedures designed to verify the identity of the
caller. The Shareholder Servicing Agent will request personal or other
information from the caller, and will normally also record calls. Shareholders
should verify the accuracy of confirmation statements immediately after their
receipt.
    

    RIGHT TO REJECT PURCHASE ORDERS/MARKET TIMING. Purchases and exchanges
should be made for investment purposes only. The Fund and MFD each reserve the
right to reject or restrict any specific purchase or exchange request. In the
event that the Fund or MFD rejects an exchange request, neither the redemption
nor the purchase side of the exchange will be processed.

The Fund is not designed for professional market timing organizations or other
entities using programmed or frequent exchanges. The Fund defines a "market
timer" as an individual, or organization acting on behalf of one or more
individudals, if (i) the individual or organization makes three or more exchange
requests out of the Fund per calender year and (ii) any one of such exchange
requests represents shares equal in value to 1/2 of 1% or more of the Fund's net
assets at the time of the request. Accounts under common ownership or control,
including accounts administered by market timers, will be aggregated for
purposes of this definition.

As noted above, the Fund and MFD each reserves the right to reject or restrict
any specific purchase and exchange request and, in addition, may impose specific
limitations with respect to market timers, including delaying for up to seven
days the purchase side of an exchange request by market timers or specifically
rejecting or otherwise restricting purchase or exchange requests by market
timers. Other funds in the MFS Family of Funds may have different and/or more
restrictive policies with respect to market timers than the Fund. These policies
are disclosed in the prospectuses of these other MFS Funds.

    DEALER CONCESSIONS. Dealers may receive different compensation with respect
to sales of Class A, Class B and Class C shares. In addition, from time to time,
MFD may pay dealers 100% of the applicable sales charge on sales of Class A
shares of certain specified MFS Funds sold by such dealer during a specified
sales period. In addition, MFD or its affiliates may, from time to time, pay
dealers an additional commission equal to 0.50% of the net asset value of all of
the Class B and/or Class C shares of certain specified MFS Funds sold by such
dealer during a specified sales period. In addition, from time to time, MFD, at
its expense, may provide additional commissions, compensation or promotional
incentives ("concessions") to dealers which sell shares of the Fund. Such
concessions provided by MFD may include financial assistance to dealers in
connection with preapproved conferences or seminars, sales or training programs
for invited registered representatives, payment for travel expenses, including
lodging, incurred by registered representatives for such seminars or training
programs, seminars for the public, advertising and sales campaigns regarding one
or more MFS Funds, and/or other dealer-sponsored events. From time to time, MFD
may make expense reimbursements for special training of a dealer's registered
representatives in group meetings or to help pay the expenses of sales contests.
Other concessions may be offered to the extent not prohibited by state laws or
any self-regulatory agency, such as the NASD.

    SPECIAL INVESTMENT PROGRAMS. For shareholders who elect to participate in
certain investment programs (e.g., the Automatic Investment Plan) or other
shareholder services, MFD or its affiliates may either (i) give a gift of
nominal value, such as a hand-held calculator, or (ii) make a nominal charitable
contribution on their behalf.

    RESTRICTIONS ON ACTIVITIES OF NATIONAL BANKS. The Glass-Steagall Act
prohibits national banks from engaging in the business of underwriting,
selling or distributing securities. Although the scope of the prohibition has
not been clearly defined, MFD believes that such Act should not preclude banks
from entering into agency agreements with MFD.  If, however, a bank were
prohibited from so acting, the Trustees would consider what actions, if any,
would be necessary to continue to provide efficient and effective shareholder
services in respect of Shareholders who invested in the Fund through a
national bank. It is not expected that shareholders would suffer any adverse
financial consequence as a result of these occurrences. In addition, state
securities laws on this issue may differ from the interpretation of federal
law expressed herein and banks and financial institutions may be required to
register as broker-dealers pursuant to state law.

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

A shareholder whose shares are held in the name of, or controlled by, a dealer
might not receive many of the privileges and services from the Fund (such as
Right of Accumulation, Letter of Intent and certain recordkeeping services) that
the Fund ordinarily provides.

EXCHANGES
Subject to the requirements set forth below, some or all of the shares in an
account with the Fund for which payment has been received by the Fund (i.e., an
established account) may be exchanged for shares of the same class of any of the
other MFS Funds at net asset value (if available for sale). Shares of one class
may not be exchanged for shares of any other class.

EXCHANGES AMONG MFS FUNDS (EXCLUDING MFS MONEY MARKET FUNDS): No initial sales
charges or CDSC will be imposed in connection with an exchange from shares of an
MFS Fund to shares of any other MFS Fund, except with respect to exchanges from
an MFS money market fund to another MFS Fund which is not an MFS money market
fund (discussed below). With respect to an exchange involving shares subject to
a CDSC, the CDSC will be unaffected by the exchange and the holding period for
purposes of calculating the CDSC will carry over to the acquired shares.

EXCHANGES FROM AN MFS MONEY MARKET FUND: Special rules apply with respect to the
imposition of an initial sales charge or a CDSC for exchanges from an MFS money
market fund to another MFS Fund which is not an MFS money market fund. These
rules are described under the caption "Exchanges" in the Prospectuses of those
MFS money market funds.

EXCHANGES INVOLVING THE MFS FIXED FUND: Class A shares of any MFS Fund held by
certain qualified retirement plans may be exchanged for units of participation
of the MFS Fixed Fund (a bank collective investment fund) (the "Units"), and
Units may be exchanged for Class A shares of any MFS Fund. With respect to
exchanges between Class A shares subject to a CDSC and Units, the CDSC will
carry over to the acquired shares or Units and will be deducted from the
redemption proceeds when such shares or Units are subsequently redeemed,
assuming the CDSC is then payable (the period during which the Class A shares
and the Units were held will be aggregated for purposes of calculating the
applicable CDSC). In the event that a shareholder initially purchases Units and
then exchanges into Class A shares subject to an initial sales charge of an MFS
Fund, the initial sales charge shall be due upon such exchange, but will not be
imposed with respect to any subsequent exchanges between such Class A shares and
Units with respect to shares on which the initial sales charge has already been
paid. In the event that a shareholder initially purchases Units and then
exchanges into Class A shares subject to a CDSC of an MFS Fund, the CDSC period
will commence upon such exchange, and the applicability of the CDSC with respect
to subsequent exchanges shall be governed by the rules set forth in this
paragraph above.

   
GENERAL: A shareholder should read the prospectus of the other MFS Fund into
which an exchange is made and consider the differences in objectives, policies
and restrictions before making any exchange. Exchanges will be made only after
instructions in writing or by telephone (an "Exchange Request") are received for
an established account by the Shareholder Servicing Agent in proper form (i.e.,
if in writing -- signed by the record owner(s) exactly as the shares are
registered; if by telephone -- proper account identification is given by the
dealer or shareholder of record) and each exchange must involve either shares
having an aggregate value of at least $1,000 ($50 in the case of retirement plan
participants whose sponsoring organizations subscribe to the MFS FUNDamental
401(k) Plan or another similar 401(k) recordkeeping system made available by the
Shareholder Servicing Agent) or all the shares in the account. If an Exchange
Request is received by the Shareholder Servicing Agent on any business day prior
to the close of regular trading on the Exchange (generally, 4:00 p.m., Eastern
time), the exchange will occur on that day if all the requirements set forth
above have been complied with at that time and subject to the Fund's right to
reject purchase orders. No more than five exchanges may be made in any one
Exchange Request by telephone. Additional information concerning this exchange
privilege and prospectuses for any of the other MFS Funds may be obtained from
dealers or the Shareholder Servicing Agent. For federal and (generally) state
income tax purposes, an exchange is treated as a sale of the shares exchanged
and, therefore, an exchange could result in a gain or loss to the shareholder
making the exchange. Exchanges by telephone are automatically available to most
non-retirement plan accounts and certain retirement plan accounts. For further
information regarding exchanges by telephone, see "Redemptions by Telephone."
The exchange privilege (or any aspect of it) may be changed or discontinued and
is subject to certain limitations, including certain restrictions on purchases
by market timers.
    

REDEMPTIONS AND REPURCHASES
A shareholder may withdraw all or any portion of the value of his account on any
date on which the Fund is open for business by redeeming shares at their net
asset value (a redemption) or by selling such shares to the Fund through a
dealer (a repurchase). Certain redemptions and repurchases are, however, subject
to a CDSC. See "Contingent Deferred Sales Charge" below. Because the net asset
value of shares of the account fluctuates, redemptions or repurchases, which are
taxable transactions, are likely to result in gains or losses to the
shareholder. When a shareholder withdraws an amount from his account, the
shareholder is deemed to have tendered for redemption a sufficient number of
full and fractional shares in his account to cover the amount withdrawn. The
proceeds of a redemption or repurchase will normally be available within seven
days, except for shares purchased or received in exchange for shares purchased
by check (including certified checks or cashier's checks). Payment of redemption
proceeds may be delayed for up to 15 days from the purchase date in an effort to
assure that such check has cleared.

REDEMPTION BY MAIL: Each shareholder may redeem all or any portion of the shares
in his account by mailing or delivering to the Shareholder Servicing Agent (see
back cover for address) a stock power with a written request for redemption or
letter of instruction, together with his share certificates (if any were
issued), all in "good order" for transfer. "Good order" generally means that the
stock power, written request for redemption, letter of instruction or
certificate must be endorsed by the record owner(s) exactly as the shares are
registered and the signature(s) must be guaranteed in the manner set forth below
under the caption "Signature Guarantee." In addition, in some cases "good order"
will require the furnishing of additional documents. The Shareholder Servicing
Agent may make certain de minimis exceptions to the above requirements for
redemption. Within seven days after receipt of a redemption request in "good
order" by the Shareholder Servicing Agent, the Fund will make payment in cash of
the net asset value of the shares next determined after such redemption request
was received, reduced by the amount of any applicable CDSC described above and
the amount of any income tax required to be withheld, except during any period
in which the right of redemption is suspended or date of payment is postponed
because the Exchange is closed or trading on such Exchange is restricted or to
the extent otherwise permitted by the 1940 Act if an emergency exists. See "Tax
Status" below.

   
REDEMPTION BY TELEPHONE: Each shareholder may redeem an amount from his account
by telephoning the Shareholder Servicing Agent toll-free at (800) 225-2606.
Shareholders wishing to avail themselves of this telephone redemption privilege
must so elect on their Account Application, designate thereon a bank and account
number to receive the proceeds of such redemption, and sign the Account
Application Form with the signature(s) guaranteed in the manner set forth below
under the caption "Signature Guarantee." The proceeds of such a redemption,
reduced by the amount of any applicable CDSC and the amount of any income tax
required to be withheld, are mailed by check to the designated account, without
charge, if the redemption proceeds do not exceed $1,000, and are wired in
federal funds to the designated account if the redemption proceeds exceed
$1,000. If a telephone redemption request is received by the Shareholder
Servicing Agent by the close of regular trading on the Exchange on any business
day, shares will be redeemed at the closing net asset value of the Fund on that
day. Subject to the conditions described in this section, proceeds of a
redemption are normally mailed or wired on the next business day following the
date of receipt of the order for redemption. The Shareholder Servicing Agent
will not be responsible for any losses resulting from unauthorized telephone
transactions if it follows reasonable procedures designed to verify the identity
of the caller. The Shareholder Servicing Agent will request personal or other
information from the caller, and will normally also record calls. Shareholders
should verify the accuracy of confirmation statements immediately after their
receipt.
    

REPURCHASE THROUGH A DEALER: If a shareholder desires to sell his shares through
his dealer (a repurchase), the shareholder can place a repurchase order with his
dealer, who may charge the shareholder a fee. IF THE DEALER RECEIVES THE
SHAREHOLDER'S ORDER PRIOR TO THE CLOSE OF REGULAR TRADING ON THE EXCHANGE AND
COMMUNICATES IT TO MFD BEFORE THE CLOSE OF BUSINESS ON THE SAME DAY, THE
SHAREHOLDER WILL RECEIVE THE NET ASSET VALUE CALCULATED ON THAT DAY, REDUCED BY
THE AMOUNT OF ANY APPLICABLE CDSC AND THE AMOUNT OF ANY INCOME TAX REQUIRED TO
BE WITHHELD.

   
CONTINGENT DEFERRED SALES CHARGE: Investments in Class A, Class B and Class C
shares ("Direct Purchases") will be subject to a CDSC for a period of: (i) with
respect to Class A and Class C shares, 12 months (however, the CDSC on Class A
shares is only imposed with respect to purchases of $1 million or more of Class
A shares or purchases by certain retirement plans of Class A shares); or (ii)
with respect to Class B shares, six years. Purchases of Class A shares made
during a calendar month, regardless of when during the month the investment
occurred, will age one month on the last day of the month and each subsequent
month. Class C share purchases and Class B shares purchased on or after January
1, 1993 will be aggregated on a calendar month basis -- all transactions made
during a calendar month, regardless of when during the month they have occurred,
will age one year at the close of business on the last day of such month in the
following calendar year and each subsequent year. Class B shares of the Fund
purchased prior to January 1, 1993, transactions will be aggregated on a
calendar year basis -- all transactions made during a calendar year, regardless
of when during the year they have occurred, will age one year at the close of
business on December 31 of that year and each subsequent year.
    

At the time of a redemption, the amount by which the value of a shareholder's
account for a particular class of shares represented by Direct Purchases exceeds
the sum of the six calendar year aggregations (12 months in the case of
purchases of Class C shares and of purchases of $1 million or more of Class A
shares or purchases by certain retirement plans of Class A shares) of Direct
Purchases may be redeemed without charge ("Free Amount"). Moreover, no CDSC is
ever assessed on additional shares acquired through the automatic reinvestment
of dividends or capital gain distributions ("Reinvested Shares"). Therefore, at
the time of redemption of a particular class, (i) any Free Amount is not subject
to the CDSC and (ii) the amount of the redemption equal to the then-current
value of Reinvested Shares is not subject to the CDSC, but (iii) any amount of
the redemption in excess of the aggregate of the then-current value of
Reinvested Shares and the Free Amount is subject to a CDSC. The CDSC will first
be applied against the amount of Direct Purchases which will result in any such
charge being imposed at the lowest possible rate. The CDSC to be imposed upon
redemptions of shares will be calculated as set forth in "Purchases" above.

The applicability of a CDSC will be unaffected by exchanges or transfers of
registration, except as described in Appendix A hereto.

GENERAL: The following information applies to redemptions and repurchases of
all classes of the Fund's shares.

    SIGNATURE GUARANTEE. In order to protect shareholders against fraud, the
Fund requires, in certain instances as indicated above, that the shareholder's
signature be guaranteed. In these cases the shareholder's signature must be
guaranteed by an eligible bank, broker, dealer, credit union, national
securities exchange, registered securities association, clearing agency or
savings association. Signature guarantees shall be accepted in accordance with
policies established by the Shareholder Servicing Agent. With respect to written
requests for redemptions, no signature guarantee or evidence that the individual
executing the stock power, written request for redemption or letter of
instruction will be required if the amount of the redemption proceeds does not
exceed specified minimums established from time to time by MFD and the proceeds
are wired or mailed to a predesignated account or address.

    REINSTATEMENT PRIVILEGE. Shareholders of the Fund who have redeemed their
shares have a one-time right to reinvest the redemption proceeds in the same
class of shares of any of the MFS Funds (if shares of such Fund are available
for sale) at net asset value (with a credit for any CDSC paid) within 90 days of
the redemption pursuant to the Reinstatement Privilege. If the shares credited
for any CDSC paid are then redeemed within six years of the initial purchase in
the case of Class B shares or within 12 months of the initial purchase for Class
C Shares and certain Class A share purchases, a CDSC will be imposed upon
redemption. Such purchases under the Reinstatement Privilege are subject to all
limitations in the SAI regarding this privilege.

    INVOLUNTARY REDEMPTIONS/SMALL ACCOUNTS. Due to the relatively high cost of
maintaining small accounts, the Fund reserves the right to redeem shares in any
account for their then-current value if at any time the total investment in such
account drops below $500 because of redemptions or exchanges, except in the case
of accounts being established for monthly automatic investments and certain
payroll savings programs, Automatic Exchange Plan accounts and tax-deferred
retirement plans, for which there is a lower minimum investment requirement. See
"Purchases -- General -- Minimum Investment." Shareholders will be notified that
the value of their account is less than the minimum investment requirement and
allowed 60 days to make an additional investment before the redemption is
processed.

DISTRIBUTION PLAN
The Trustees have adopted a Distribution Plan for Class A, Class B and Class C
shares pursuant to Section 12(b) of the 1940 Act and Rule 12b-1 thereunder (the
"Distribution Plan"), after having concluded that there is a reasonable
likelihood that the Plan would benefit the Fund and its shareholders.

In certain circumstances, the fees described below may not be imposed or are
being waived. These circumstances, if any, are described below under the heading
"Current Level of Distribution and Service Fees."

FEATURES COMMON TO EACH CLASS OF SHARES: There are certain features of the
Distribution Plan that are common to each Class of shares, as described below.

    SERVICE FEES. The Distribution Plan provides that the Fund may pay MFD a
service fee of up to 0.25% of the average daily net assets attributable to the
class of shares to which the Distribution Plan relates (i.e., Class A, Class B
or Class C shares, as appropriate) (the "Designated Class") annually in order
that MFD may pay expenses on behalf of the Fund relating to the servicing of
shares of the Designated Class. The service fee is used by MFD to compensate
dealers which enter into a sales agreement with MFD in consideration for all
personal services and/or account maintenance services rendered by the dealer
with respect to shares of the Designated Class owned by investors for whom such
dealer is the dealer or holder of record. MFD may from time to time reduce the
amount of the service fees paid for shares sold prior to a certain date. Service
fees may be reduced for a dealer that is the holder or dealer of record for an
investor who owns shares of the Fund having an aggregate net asset value at or
above a certain dollar level. Dealers may from time to time be required to meet
certain criteria in order to receive service fees. MFD or its affiliates are
entitled to retain all service fees payable under the Distribution Plan for
which there is no dealer of record or for which qualification standards have not
been met as partial consideration for personal services and/or account
maintenance services performed by MFD or its affiliates to shareholder accounts.

    DISTRIBUTION FEES. The Distribution Plan provides that the Fund may pay MFD
a distribution fee based on the average daily net assets attributable to the
Designated Class as partial consideration for distribution services performed
and expenses incurred in the performance of MFD's obligations under its
distribution agreement with the Fund. See "Management of the Fund --
Distributor" in the SAI. The amount of the distribution fee paid by the Fund
with respect to each class differs under the Distribution Plan, as does the use
by MFD of such distribution fees. Such amounts and uses are described below in
the discussion of the provisions of the Distribution Plan relating to each Class
of shares. While the amount of compensation received by MFD in the form of
distribution fees during any year may be more or less than the expense incurred
by MFD under its distribution agreement with the Fund, the Fund is not liable to
MFD for any losses MFD may incur in performing services under its distribution
agreement with the Fund.

    OTHER COMMON FEATURES. Fees payable under the Distribution Plan are charged
to, and therefore reduce, income allocated to shares of the Designated Class.
The provisions of the Distribution Plan relating to operating policies as well
as initial approval, renewal, amendment and termination are substantially
identical as they relate to each class of shares covered by the Distribution
Plan.

FEATURES UNIQUE TO EACH CLASS OF SHARES: There are certain features of the
Distribution Plan that are unique to each class of shares, as described below.

    CLASS A SHARES. Class A shares are generally offered pursuant to an initial
sales charge, a substantial portion of which is paid to or retained by the
dealer making the sale (the remainder of which is paid to MFD). See "Purchases
- -- Class A Shares" above. In addition to the initial sales charge, the dealer
also generally receives the ongoing 0.25% per annum service fee, as discussed
above.

The distribution fee paid to MFD under the Distribution Plan is equal, on an
annual basis, to 0.10% of the Fund's average daily net assets attributable to
Class A shares. As noted above, MFD may use the distribution fee to cover
distribution-related expenses incurred by it under its distribution agreement
with the Fund, including commissions to dealers and payments to wholesalers
employed by MFD (e.g., MFD pays commissions to dealers with respect to purchases
of $1 million or more and purchases by certain retirement plans of Class A
shares which are sold at net asset value but which are subject to a 1% CDSC for
one year after purchase). See "Purchases -- Class A Shares" above. In addition,
to the extent that the aggregate service and distribution fees paid under the
Distribution Plan do not exceed 0.35% per annum of the average daily net assets
of the Fund attributable to Class A shares, the Fund is permitted to pay such
distribution-related expenses or other distribution- related expenses.

    CLASS B SHARES. Class B shares are offered at net asset value without an
initial sales charge but subject to a CDSC. See "Purchases -- Class B Shares"
above. MFD will advance to dealers the first year service fee described above at
a rate equal to 0.25% of the purchase price of such shares and, as compensation
therefore, MFD may retain the service fee paid by the Fund with respect to such
shares for the first year after purchase. Dealers will become eligible to
receive the ongoing 0.25% per annum service fee with respect to such shares
commencing in the thirteenth month following purchase.

Under the Distribution Plan, the Fund pays MFD a distribution fee equal, on an
annual basis, to 0.75% of the Fund's average daily net assets attributable to
Class B shares. As noted above, this distribution fee may be used by MFD to
cover its distribution-related expenses under its distribution agreement with
the Fund (including the 3.75% commission it pays to dealers upon purchase of
Class B shares, as described under "Purchases -- Class B Shares" above).

    CLASS C SHARES. Class C shares are offered at net asset value without an
initial sales charge but subject to a CDSC. See "Purchases -- Class C shares"
above. MFD will pay a commission to dealers of 1.00% of the purchase price of
Class C shares purchased through dealers at the time of purchase. In
compensation for this 1.00% commission paid by MFD to dealers, MFD will retain
the 1.00% per annum Class C distribution and service fees paid by the Fund with
respect to such shares for the first year after purchase, and dealers will
become eligible to receive from MFD the ongoing 1.00% per annum distribution and
service fees paid by the Fund to MFD with respect to such shares commencing in
the thirteenth month following purchase.

This ongoing 1.00% fee is comprised of the 0.25% per annum service fee paid to
MFD under the Distribution Plan (which MFD in turn pays to dealers), as
discussed above, and a distribution fee paid to MFD (which MFD also in turn pays
to dealers) under the Distribution Plan equal, on an annual basis, to 0.75% of
the Fund's average daily net assets attributable to Class C shares.

   
CURRENT LEVEL OF DISTRIBUTION AND SERVICE FEES: The Fund's Class A, Class B and
Class C distribution and service fees for its current fiscal year are 0.35%,
1.00% and 1.00% per annum, respectively.

DISTRIBUTIONS
The Fund intends to pay substantially all of its net investment income to its
shareholders as dividends on an annual basis. In determining the net investment
income available for distributions, the Fund may rely on projections of its
anticipated net investment income over a longer term, rather than its actual net
investment income for the period. The Fund may make one or more distributions
during the calendar year to its shareholders from any net realized long-term or
short-term capital gains. Shareholders may elect to receive dividends and
capital gain distributions in either cash or additional shares of the same class
to which a distribution is made. See "Tax Status" and "Shareholder Services --
Distribution Options" below. Distributions paid by the Fund with respect to
Class A shares will generally be greater than those paid with respect to Class B
and Class C shares because expenses attributable to Class B and Class C shares
will generally be higher.
    

TAX STATUS
The Fund is treated as an entity separate from the other series of the Trust for
federal income tax purposes. In order to minimize the taxes the Fund would
otherwise be required to pay, the Fund has elected and intends to qualify each
year as a "regulated investment company" under Subchapter M of the Internal
Revenue Code of 1986, as amended (the "Code"). Because the Fund intends to
distribute all of its net investment income and net realized capital gains to
its shareholders in accordance with the timing requirements imposed by the Code,
it is not expected that the Fund will be required to pay any entity level
federal income or excise taxes.

   
Shareholders of the Fund that are not tax-exempt entities will normally have to
pay U.S. federal income taxes, and any state and local taxes, on the dividends
and capital gain distributions they receive from the Fund, whether paid in cash
or additional shares. A portion of the dividends received from the Fund (but
none of the Fund's capital gain distributions) may qualify for the dividends
received deduction for corporations. Shareholders that are not liable for income
taxes, such as pension plans, generally will not pay taxes on Fund dividends or
capital gain distributions. Non-tax-exempt shareholders should consult their tax
advisers before making an investment in the Fund.
    

Shortly after the end of each calendar year, each non-tax-exempt shareholder
will be sent a statement setting forth the federal income tax status of all
dividends and distributions for that year, including the portion taxable as
ordinary income, the portion taxable as long-term capital gain, the portion, if
any, representing a return of capital (which is free of current taxes but
results in a basis reduction), and the amount, if any, of federal income tax
withheld.

Fund distributions will reduce the Fund's net asset value per share. Nonexempt
shareholders who buy shares shortly before the Fund makes a distribution may
thus pay the full price for the shares and then effectively receive a portion of
the purchase price back as a taxable distribution.

The Fund intends to withhold U.S. federal income tax at the rate of 30% on
dividends and certain other payments that are subject to such withholding, and
that are made to persons who are neither citizens nor residents of the U.S.,
regardless of whether a lower rate may be permitted under an applicable treaty.
The Fund is also required in certain circumstances to apply backup withholding
of 31% on taxable dividends and redemption proceeds paid to any shareholder
(including a shareholder who is neither a citizen nor a resident of the U.S.)
who does not furnish to the Fund certain information and certifications or who
is otherwise subject to backup withholding. Backup withholding will not,
however, be applied to payments that have been subject to 30% withholding.
Prospective investors should read the Fund's Account Application for information
regarding backup withholding of federal income tax and should consult their own
tax advisors as to the tax consequences of an investment in the Fund.

NET ASSET VALUE
The net asset value per share of each class of shares of the Fund is determined
each day during which the Exchange is open for trading. This determination is
made once each day as of the close of regular trading on the Exchange by
deducting the amount of the liabilities attributable to the class from the value
of the assets attributable to the class and dividing the difference by the
number of shares of the class outstanding. Assets in the Fund's portfolio are
valued on the basis of their market or other fair value, as described in the
SAI. The net asset value per share of each class of shares is effective for
orders received by the dealer prior to its calculation and received by MFD prior
to the close of that business day.

DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES
The Fund has three classes of shares which it offers to the general public,
entitled Class A, Class B and Class C Shares of Beneficial Interest (without par
value). The Fund also has a class of shares which it offers exclusively to
certain institutional investors, entitled Class I shares. Each share of a class
represents an equal proportionate interest in the Fund with each other share of
that class subject to any liabilities of the particular class. Shareholders are
entitled to one vote for each share held and may vote in the election of
Trustees and on other matters submitted to meetings of shareholders. Each class
of shares of the Fund will vote separately on any material increase in the fees
under the Distribution Plan or on any other matter that affects solely that
class of shares, but will otherwise vote together with all other classes of
shares of the Fund on all other matters. The Fund has reserved the right to
create series of shares and to issue additional classes of shares. Each class of
shares of a series would participate equally in the earnings, dividends and
assets attributable to that class of that particular series. Shareholders of
each series would be entitled to vote separately to approve investment advisory
agreements or changes in investment restrictions, but shares of all series would
vote together in the election of Trustees and selection of accountants. The Fund
does not intend to hold annual shareholder meetings. The Fund's Declaration of
Trust provides that a Trustee may be removed from office in certain instances
(see "Description of Shares, Voting Rights and Liabilities" in the SAI).

Shares have no pre-emptive or conversion rights (except as set forth above in
"Purchases -- Conversion of Class B Shares"). Shares are fully paid and
non-assessable. Should the Fund be liquidated, shareholders of each class are
entitled to share pro rata in the net assets attributable to that class
available for distribution to shareholders. Shares will remain on deposit with
the Shareholder Servicing Agent and certificates will not be issued except in
connection with pledges and assignments and in certain other limited
circumstances.

The Fund is an entity of the type commonly known as a "Massachusetts business
trust." Under Massachusetts law, shareholders of such a trust may, under certain
circumstances, be held personally liable as partners for its obligations.
However, the risk of a shareholder incurring financial loss on account of
shareholder liability is limited to circumstances in which both inadequate
insurance existed (e.g., fidelity bonding and errors and omissions insurance)
and the Fund itself was unable to meet its obligations.

PERFORMANCE INFORMATION
From time to time, the Fund will provide total rate of return quotations for
each class of its shares and may also quote fund rankings in the relevant fund
category from various sources, such as the Lipper Analytical Services, Inc. and
Wiesenberger Investment Companies Service. From time to time the Fund may also
compare its performance to the LSI. Total rate of return quotations will reflect
the average annual percentage change over stated periods in the value of an
investment in a class of shares of the Fund made at the maximum public offering
price of shares of that class with all distributions reinvested and which will
give effect to the imposition of any applicable CDSC assessed upon redemptions
of the Fund's Class B and Class C shares. Such total rate of return quotations
may be accompanied by quotations which do not reflect the reduction in value of
the initial investment due to the sales charge or the deduction of a CDSC, and
which will thus be higher. The Fund offers multiple classes of shares which were
initially offered for sale to the public on different dates. The calculation of
total rate of return for a class of shares which initially was offered for sale
to the public subsequent to another class of shares of the Fund is based both on
(i) the performance of the Fund's newer class from the date it initially was
offered for sale to the public and (ii) the performance of the Fund's oldest
class from the date it initially was offered for sale to the public up to the
date that the newer class initially was offered for sale to the public. See the
SAI for further information on the calculation of total rate of return for share
classes initially offered for sale to the public on different dates.

The Fund's total rate of return quotations are based on historical performance
and are not intended to indicate future performance. Total rate of return
reflects all components of investment return over a stated period of time. The
Fund's quotations may from time to time be used in advertisements, shareholder
reports or other communications to shareholders. For a discussion of the manner
in which the Fund will calculate its total rate of return, see the SAI. For
further information about the Fund's performance for the fiscal year ended
September 30, 1996, please see the Fund's Annual Report. A copy of the Annual
Report may be obtained without charge by contacting the Shareholder Servicing
Agent (see back cover for address and phone number). In addition to information
provided in shareholder reports, the Fund may, in its discretion, from time to
time, make a list of all or a portion of its holdings available to investors
upon request.

EXPENSES
The Trust pays the compensation of the Trustees who are not officers of MFS and
all expenses of the Fund (other than those assumed by MFS or MFD) including but
not limited to: governmental fees; interest charges; taxes, membership dues in
the Investment Company Institute allocable to the Fund; fees and expenses of
independent auditors, of legal counsel, and of any transfer agent, registrar or
dividend disbursing agent of the Fund; expenses of redeeming shares and
servicing shareholder accounts; expenses of preparing, printing and mailing,
prospectuses, periodic reports, notices and proxy statements to shareholders and
to governmental offiers and commissions; brokerage and other expenses connected
with the execution, recording and settlement of portfolio security transactions;
insurance premiums; fees and expenses of State Street Bank and Trust Company,
the Fund's Custodian, for all services to the Fund, including safekeeping of
funds and securities and maintaining required books and accounts; expenses of
calculating the net asset value of shares of the Fund; and expenses of
shareholder meetings. Expenses relating to the issuance, registration and
qualification of shares of the Fund and the preparation, printing and mailing of
prospectuses are borne by the Fund except that the Distribution Agreement with
MFD requires MFD to pay for prospectuses that are to be used for sales purposes.
Expenses of the Trust which are not attributable to a specific series of the
Trust are allocated between the series in a manner believed by management of the
Trust to be fair and equitable.

   
Subject to termination or revision at the sole discretion of MFS, MFS has agreed
to bear the Fund's expenses such that the Fund's "Other Expenses," which are
defined to include all Fund expenses except for management fees, Rule 12b-1
fees, taxes, extraordinary expenses, brokerage and termination costs do not
exceed 0.20% per annum of its average daily net assets (the "Maximum
Percentage"). The obligation of MFS to bear these expenses terminates on the
last day of the Fund's fiscal year in which the Fund's "Other Expenses" are less
than or equal to the Maximum Percentage. The payments made by MFS on behalf of
the Fund under this arrangement are subject to reimbursement by the Fund to MFS,
which will be accomplished by the payment of an expense reimbursement fee by the
Fund to MFS computed and paid monthly at a percentage of its average daily net
assets for its then current fiscal year, with a limitation that immediately
after such payment the Fund's "Other Expenses" will not exceed the Maximum
Percentage. This expense reimbursement by the Fund to MFS terminates on the
earlier of the date on which payments made by the Fund equal the prior payment
of such reimbursable expenses by MFS or December 31, 1998.
    
9.  SHAREHOLDER SERVICES
Shareholders with questions concerning the shareholder services described below
or concerning other aspects of the Fund should contact the Shareholder Servicing
Agent (see back cover for address and phone number).

ACCOUNT AND CONFIRMATION STATEMENTS -- Each shareholder will receive
confirmation statements showing the transaction activity in his account.
Cancelled checks, if any, will be sent to shareholders monthly. At the end of
each calendar year, each shareholder will receive information regarding the tax
status of reportable dividends and distributions for that year (see "Tax
Status").

DISTRIBUTION OPTIONS -- The following options are available to all accounts
(except Systematic Withdrawal Plan accounts) and may be changed as often as
desired by notifying the Shareholder Servicing Agent:

    -- Dividends and capital gain distributions reinvested in additional
       shares. This option will be assigned if no other option is specified;

    -- Dividends in cash; capital gain distributions reinvested in additional
       shares;

    -- Dividends and capital gain distributions in cash.

Reinvestments (net of any tax withholding) will be made in additional full and
fractional shares of the same class of shares at the net asset value in effect
at the close of business on the last business day of the month. Dividends and
capital gain distributions in amounts less than $10 will automatically be
reinvested in additional shares of the Fund. If a shareholder has elected to
receive dividends and/or capital gain distributions in cash, and the postal or
other delivery service is unable to deliver checks to the shareholder's address
of record or the shareholder does not respond to mailings from the Shareholder
Servicing Agent with regard to uncashed checks, such shareholder's distribution
option will automatically be converted to having all dividends and other
distributions reinvested in additional shares. Any request to change a
distribution option must be received by the Shareholder Servicing Agent by the
record date for a dividend or distribution in order to be effective for that
dividend or distribution. No interest will accrue on amounts represented by
uncashed distribution or redemption checks.

INVESTMENT AND WITHDRAWAL PROGRAMS -- For the convenience of shareholders, the
Fund makes available the following programs designed to enable shareholders to
add to their investment in an account with the Fund or withdraw from it with a
minimum of paper work. The programs involve no extra charge to shareholders
(other than a sales charge in the case of certain Class A share purchases) and
may be changed or discontinued at any time by a shareholder or the Fund.

    LETTER OF INTENT: If a shareholder (other than a group purchaser as
described in the SAI) anticipates purchasing $50,000 or more of Class A shares
of the Fund alone or in combination with shares of any class of other MFS Funds
or the MFS Fixed Fund (a bank collective investment fund) within a 13- month
period (or 36-month period for purchases of $1 million or more), the shareholder
may obtain such shares at the same reduced sales charge as though the total
quantity were invested in one lump sum, subject to escrow arrangements and the
appointment of an attorney for redemptions from the escrow amount if the
intended purchases are not completed, by completing the Letter of Intent section
of the Account Application.

    RIGHT OF ACCUMULATION: A shareholder qualifies for cumulative quantity
discounts on purchases of Class A shares when his new investment, together with
the current offering price value of all holdings of Class A, Class B and Class C
shares of that shareholder in the MFS Funds or the MFS Fixed Fund (a bank
collective investment fund) reaches a discount level.

    DISTRIBUTION INVESTMENT PROGRAM: Shares of a particular class of the Fund
may be sold at net asset value (and without any applicable CDSC) through the
automatic reinvestment of dividend and capital gain distributions from the same
class of another MFS Fund. Furthermore, distributions made by the Fund may be
automatically invested at net asset value (and without any applicable CDSC) in
shares of the same class of another MFS Fund, if shares of such Fund are
available for sale.

    SYSTEMATIC WITHDRAWAL PLAN: A shareholder may direct the Shareholder
Servicing Agent to send him (or anyone he designates) regular periodic payments
based upon the value of his account. Each payment under a Systematic Withdrawal
Plan (a "SWP") must be at least $100, except in certain limited circumstances.
The aggregate withdrawals of Class B and Class C shares in any year pursuant to
a SWP will not be subject to a CDSC and are generally limited to 10% of the
value of the account at the time of the establishment of the SWP. The CDSC will
not be waived in the case of SWP redemptions of Class A shares which are subject
to a CDSC.

    DOLLAR COST AVERAGING PROGRAMS --
    AUTOMATIC INVESTMENT PLAN: Cash investments of $50 or more may be made
through a shareholder's checking account on any day of the month. If the
shareholder does not specify a date, the investment will automatically occur on
the first business day of the month. Required forms are available from the
Shareholder Servicing Agent or investment dealers.

    AUTOMATIC EXCHANGE PLAN: Shareholders having account balances of at least
$5,000 in any MFS Fund may exchange their shares for the same class of shares of
the other MFS Funds (and, in the case of Class C shares, for shares of MFS Money
Market Fund) if such funds are available for sale under the Automatic Exchange
Plan, a dollar cost averaging program. The Automatic Exchange Plan provides for
automatic monthly or quarterly exchanges of funds from the shareholder's account
in an MFS Fund for investment in the same class of shares of other MFS Funds
selected by the shareholder if such fund is available for sale. Under the
Automatic Exchange Plan, exchanges of at least $50 each may be made to up to six
different funds. A shareholder should consider the objectives and policies of a
fund and review its prospectus before electing to exchange money into such fund
through the Automatic Exchange Plan. No transaction fee is imposed in connection
with exchange transactions under the Automatic Exchange Plan. However, exchanges
from MFS Money Market Fund, MFS Government Money Market Fund or Class A shares
of MFS Cash Reserve Fund will be subject to any applicable sales charge. For
federal and (generally) state income tax purposes, an exchange is treated as a
sale of the shares exchanged and, therefore, could result in a capital gain or
loss to the shareholder making the exchange. See the SAI for further information
concerning the Automatic Exchange Plan. Investors should consult their tax
advisers for information regarding the potential capital gain and loss
consequences of transactions under the Automatic Exchange Plan.

    Because a dollar cost averaging program involves periodic purchases of
shares regardless of fluctuating share offering prices, a shareholder should
consider his financial ability to continue his purchases through periods of low
price levels. Maintaining a dollar cost averaging program concurrently with a
withdrawal program could be disadvantageous because of the sales charges
included in share purchases in the case of Class A shares, and because of the
assessment of the CDSC for certain share redemptions in the case of Class A
shares.

TAX-DEFERRED RETIREMENT PLANS -- Except as noted under "Purchases -- Class C
Shares," shares of the Fund may be purchased by all types of tax-deferred
retirement plans, including IRAs, SEP-IRA plans, 401(k) plans, 403(b) plans
and other corporate pension and profit-sharing plans. Investors should consult
with their tax advisers before establishing any of the tax-deferred retirement
plans described above.

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

The Fund's SAI, dated August 1, 1997, as amended or supplemented from time to
time, contains more detailed information about the Fund, including, but not
limited to, information related to: (i) investment objective, policies and
restrictions; (ii) Trustees, officers and investment adviser; (iii) portfolio
transactions; (iv) the method used to calculate performance quotations of the
Fund; (v) various services and privileges provided for the benefit of
shareholders; (vi) the Distribution Plan; (vii) determination of net asset value
of shares of the Fund; and (viii) certain voting rights of shareholders.
<PAGE>
                                                                      APPENDIX A
                            WAIVERS OF SALES CHARGES

   
This Appendix sets forth the various circumstances in which all applicable sales
charges are waived (Section I), the initial sales charge and the contingent
deferred sales charge ("CDSC") for Class A shares is waived (Section II), and
the CDSC for Class B and Class C shares is waived (Section III). As used in this
Appendix, the term "dealer" includes any broker, dealer, bank (including bank
trust departments), registered investment adviser, financial planner and any
other financial institutions having a selling agreement or other similar
agreement with MFS Fund Distributors Inc. ("MFD").
    

I.   WAIVERS OF ALL APPLICABLE SALES CHARGES

     In the following circumstances, the initial sales charge imposed on
     purchases of Class A shares and the CDSC imposed on certain redemptions of
     Class A shares and on redemptions of Class B and Class C shares, as
     applicable, is waived:

     1. DIVIDEND REINVESTMENT

        o Shares acquired through dividend or capital gain reinvestment; and

        o Shares acquired by automatic reinvestment of distributions of
          dividends and capital gains of any fund in the MFS Family of Funds
          ("MFS Funds") pursuant to the Distribution Investment Program.

     2. CERTAIN ACQUISITIONS/LIQUIDATIONS

        o Shares acquired on account of the acquisition or liquidation of assets
          of other investment companies or personal holding companies.

     3. AFFILIATES OF AN MFS FUND/CERTAIN DEALERS. Shares acquired by:

        o Officers, eligible directors, employees (including retired employees)
          and agents of MFS, Sun Life Assurance Company of Canada ("Sun Life")
          or any of their subsidiary companies;

   
        o Trustees and retired trustees of any investment company for which MFD
          serves as distributor;
    

        o Employees, directors, partners, officers and trustees of any sub-
          adviser to any MFS Fund;

        o Employees or registered representatives of dealers and other financial
          institution ("dealers") which have a sales agreement with MFD;

        o Certain family members of any such individual and their spouses
          identified above and certain trusts, pension, profit-sharing or other
          retirement plans for the sole benefit of such persons, provided the
          shares are not resold except to the MFS Fund which issued the shares;
          and

        o Institutional Clients of MFS or MFS Institutional Advisors, Inc.
          ("MFSI").

     4. INVOLUNTARY REDEMPTIONS (CDSC WAIVER ONLY)

        o Shares redeemed at an MFS Fund's direction due to the small size of a
          shareholder's account. See "Redemptions and Repurchases -- General --
          Involuntary Redemptions/ Small Accounts" in the Prospectus.

     5. RETIREMENT PLANS (CDSC WAIVER ONLY). Shares redeemed on account of
        distributions made under the following circumstances:

        INDIVIDUAL RETIREMENT ACCOUNTS ("IRA'S")

        o Death or disability of the IRA owner.

        SECTION 401(a) PLANS ("401(a) PLANS") AND SECTION 403(b) EMPLOYER
        SPONSORED PLANS ("ESP PLANS")

        o Death, disability or retirement of 401(a) or ESP Plan participant;

   
        o Loan from 401(a) or ESP Plan;

        o Financial hardship (as defined in Treasury Regulation Section
          1.401(k)-1(d)(2), as amended from time to time);
    

        o Termination of employment of 401(a) or ESP Plan participant
          (excluding, however, a partial or other termination of the 401(a) or
          ESP Plan);

        o Tax-free return of excess 401(a) or ESP Plan contributions;

        o To the extent that redemption proceeds are used to pay expenses (or
          certain participant expenses) of the 401(a) or ESP Plan (e.g.,
          participant account fees), provided that the 401(a) or ESP Plan
          sponsor subscribes to the MFS FUNDamental 401(k) Plan or another
          similar recordkeeping system made available by the Shareholder
          Servicing Agent; and

        o Distributions from a 401(a) or ESP Plan that has invested its assets
          in one or more of the MFS Funds for more than 10 years from the later
          to occur of: (i) January 1, 1993 or (ii) the date such 401(a) or ESP
          Plan first invests its assets in one or more of the MFS Funds. The
          sales charges will be waived in the case of a redemption of all of the
          401(a) or ESP Plan's shares in all MFS Funds (i.e., all the assets of
          the 401(a) or ESP Plan invested in the MFS Funds are withdrawn),
          unless immediately prior to the redemption, the aggregate amount
          invested by the 401(a) or ESP Plan in shares of the MFS Funds
          (excluding the reinvestment of distributions) during the prior four
          years equals 50% or more of the total value of the 401(a) or ESP
          Plan's assets in the MFS Funds, in which case the sales charges will
          not be waived.

        SECTION 403(b) SALARY REDUCTION ONLY PLANS ("SRO PLANS")

        o Death or disability of SRO Plan participant.

     6. CERTAIN TRANSFERS OF REGISTRATION (CDSC WAIVER ONLY). Shares
        transferred:

        o To an IRA rollover account where any sales charges with respect to the
          shares being reregistered would have been waived had they been
          redeemed; and

        o From a single account maintained for a 401(a) Plan to multiple
          accounts maintained by the Shareholder Servicing Agent on behalf of
          individual participants of such Plan, provided that the Plan sponsor
          subscribes to the MFS FUNDamental 401(k) Plan or another similar
          recordkeeping system made available by the Shareholder Servicing
          Agent.

   
     7. LOAN REPAYMENTS

        o Shares acquired pursuant to repayments by retirement plan participants
          of loans from 401(a) or ESP Plans with respect to which such Plan or
          its sponsoring organization subscribes to the MFS FUNDamental 401(k)
          Program or the MFS Recordkeeper Plus Program (but not the MFS
          Recordkeeper Program).
    

II.  WAIVERS OF CLASS A SALES CHARGES

     In addition to the waivers set forth in Section I above, in the following
     circumstances the initial sales charge imposed on purchases of Class A
     shares and the CDSC imposed on certain redemptions of Class A shares is
     waived:

   
     1. WRAP ACCOUNT INVESTMENTS AND OTHER SIMILAR PROGRAMS

        o Shares acquired by investments through certain dealers (including
          registered investment advisers and financial planners) which have
          established certain operational arrangements with MFD which include a
          requirement that such shares be sold for the sole benefit of clients
          participating in a "wrap" account, mutual fund marketplace account or
          a similar program under which such clients pay a fee to such dealer.

     2. INVESTMENT BY INSURANCE COMPANY SEPARATE ACCOUNTS

        o Shares acquired by insurance company separate accounts.

     3. RETIREMENT PLANS

        ADMINISTRATIVE SERVICES ARRANGEMENTS

        o Shares acquired by retirement plans or trust accounts whose third
          party administrators or dealers have entered into an administrative
          services agreement with MFD or one of its affiliates to perform
          certain administrative services, subject to certain operational and
          minimum size requirements specified from time to time by MFD or one or
          more of its affiliates.

        REINVESTMENT OF DISTRIBUTIONS FROM QUALIFIED RETIREMENT PLANS
    

        o Shares acquired through the automatic reinvestment in Class A shares
          of Class A or Class B distributions which constitute required
          withdrawals from qualified retirement plans.

        Shares redeemed on account of distributions made under the following
        circumstances:

        IRA'S

        o Distributions made on or after the IRA owner has attained the age of
          59 1/2 years old; and

        o Tax-free returns of excess IRA contributions.

        401(a) PLANS

        o Distributions made on or after the 401(a) Plan participant has
          attained the age of 59 1/2 years old; and

        o Certain involuntary redemptions and redemptions in connection with
          certain automatic withdrawals from a Plan.

        ESP PLANS AND SRO PLANS

        o Distributions made on or after the ESP or SRO Plan participant has
          attained the age of 59 1/2 years old.

III. WAIVERS OF CLASS B AND CLASS C SALES CHARGES

   
     In addition to the waivers set forth in Section I above, in the following
     circumstances the CDSC imposed on redemptions of Class B and Class C shares
     is waived:
    

     1. SYSTEMATIC WITHDRAWAL PLAN

   
        o Systematic Withdrawal Plan redemptions with respect to up to 10% per
          year (or 15% per year, in the case of accounts registered as IRAs
          where the redemption is made pursuant to Section 72(t) of the Internal
          Revenue Code of 1986, as amended), of the account value at the time of
          establishment.

     2. DEATH OF OWNER
    

        o Shares redeemed on account of the death of the account owner if the
          shares are held solely in the deceased individual's name or in a
          living trust for the benefit of the deceased individual.

   
     3. DISABILITY OF OWNER

        o Shares redeemed on account of the disability of the account owner if
          shares are held either solely or jointly in the disabled individual's
          name or in a living trust for the benefit of the disabled individual
          (in which case a disability certification form is required to be
          submitted to the Shareholder Servicing Agent).

     4. RETIREMENT PLANS. Shares redeemed on account of distributions made under
        the following circumstances:

        IRA'S, 401(a) PLANS, ESP PLANS AND SRO PLANS

        o Distributions made on or after the IRA owner or the 401(a), ESP or SRO
          Plan participant, as applicable, has attained the age of 70 1/2 years
          old, but only with respect to the minimum distribution under
          applicable Internal Revenue Code ("Code") rules.

        SALARY REDUCTION SIMPLIFIED EMPLOYEE PENSION PLANS ("SAR-SEP PLANS")

        o Distributions made on or after the SAR-SEP Plan participant has
          attained the age of 70 1/2 years old, but only with respect to the
          minimum distribution under applicable Code rules;

        o Death or disability of a SAR-SEP Plan participant.
    
<PAGE>

                                                                    APPENDIX B

              DESCRIPTION OF OBLIGATIONS ISSUED OR GUARANTEED BY
          U.S. GOVERNMENT AGENCIES, AUTHORITIES OR INSTRUMENTALITIES

FHA DEBENTURES are debentures issued by the Federal Housing Administration and
fully and unconditionally guaranteed by the U.S. Government.

GNMA CERTIFICATES are mortgage-backed securities, with timely payment guaranteed
by the full faith and credit of the U.S. Government which represent partial
ownership interests in a pool of mortgage loans issued by lenders such as
mortgage bankers, commercial banks and savings and loan associations. Each
mortgage loan included in the pool is also insured or guaranteed by the Federal
Housing Administration, the Veterans Administration or the Farmers Home
Administration.

FHLMC BONDS are bonds issued and guaranteed by the Federal Home Loan Mortgage
Corporation and are not guaranteed by the U.S. Government.

FNMA BONDS are bonds issued and guaranteed by the Federal National Mortgage
Association and are not guaranteed by the U.S. Government.

PUBLIC HOUSING NOTES AND BONDS are short-term project notes and long-term bonds
issued by public housing and urban renewal agencies in connection with programs
administered by the Department of Housing and Urban Development of the U.S.
Government, the payment of which is guaranteed by the full faith and credit of
the U.S. Government.

SBA DEBENTURES are debentures issued and guaranteed as to principal and
interest by the Small Business Administration of the U.S. Government.

SLMA DEBENTURES are debentures backed by the Student Loan Marketing
Association and are not guaranteed by the U.S. Government.

TITLE XI BONDS are ship financing bonds issued under Title XI of the Merchant
Marine Act of 1936, as amended, and guaranteed by the Maritime Administration of
the U.S. Government.

WASHINGTON METROPOLITAN AREA TRANSIT AUTHORITY BONDS are bonds issued by the
Washington Metropolitan Area Transit Authority and guaranteed by the full faith
and credit of the U.S. Government.

The list of securities set forth above does not purport to be an exhaustive
compilation of all debt obligations issued or guaranteed by U.S. Government
agencies, authorities or instrumentalities. The Fund reserves the right to
invest in debt obligations issued or guaranteed by U.S. Government agencies,
authorities or instrumentalities in addition to those listed above.
<PAGE>
Investment Adviser
Massachusetts Financial Services Company
500 Boylston Street
Boston, MA 02116
(617) 954-5000

Distributor
MFS Fund Distributors, Inc.
500 Boylston Street
Boston, MA 02116
(617) 954-5000

Custodian and Dividend Disbursing Agent
State Street Bank and Trust Company
225 Franklin Street
Boston, MA 02110

   
Shareholder Servicing Agent
MFS Service Center, Inc.
500 Boylston Street
Boston, MA 02116
Toll-free: (800) 225-2606
    

Mailing Address:
P.O. Box 2281
Boston, MA 02107-9906

Independent Auditors
Deloitte & Touche LLP
125 Summer Street
Boston, MA 02110



[LOGO] M F S(SM)
INVESTMENT MANAGEMENT
We invented the mutual fund(SM)


   
MFS(R) UNION STANDARD(R)
EQUITY FUND
500 Boylston Street
Boston, MA 02116


               USE-1-8/97/30M         Union Label [LOGO]
    




[LOGO] M F S(SM)
INVESTMENT MANAGEMENT
We invented the mutual fund(SM)


   
MFS(R) UNION STANDARD(R)
EQUITY FUND
    

Prospectus

August 1, 1997
<PAGE>

[LOGO] M F S(SM)
INVESTMENT MANAGEMENT

   
MFS(R) UNION STANDARD(R)                                  STATEMENT OF
EQUITY FUND                                               ADDITIONAL INFORMATION
    

(A Member of the MFS Family of Funds(R))                  August 1, 1997
- -------------------------------------------------------------------------------

   
                                                                          Page
 1.  Definitions ......................................................      2
 2.  Investment Objective and Policies ................................      2
 3.  Investment Restrictions ..........................................      8
 4.  Management of the Fund ...........................................      9
        Trustees ......................................................      9
        Officers ......................................................      9
        Trustee Compensation Table ....................................      9
        Investment Adviser ............................................      9
        Custodian .....................................................     10
        Shareholder Servicing Agent ...................................     10
        Distributor ...................................................     10
 5.  Portfolio Transactions and Brokerage Commissions .................     11
 6.  Shareholder Services .............................................     12
        Investment and Withdrawal Programs ............................     12
        Exchange Privilege ............................................     14
        Tax-Deferred Retirement Plans .................................     14
 7.  Tax Status .......................................................     15
 8.  Determination of Net Asset Value and Performance .................     16
 9.  Distribution Plan ................................................     18
10.  Description of Shares, Voting Rights and Liabilities .............     18
11.  Independent Auditors and Financial Statements ....................     19
    

MFS UNION STANDARD(SM) EQUITY FUND A Series of MFS(R) Union Standard(SM) Trust
500 Boylston Street, Boston, Massachusetts 02116
(617) 954-5000

This Statement of Additional Information, as amended or supplemented from time
to time (the "SAI"), sets forth information which may be of interest to
investors but which is not necessarily included in the Fund's Prospectus, dated
August 1, 1997. This SAI should be read in conjunction with the Prospectus, a
copy of which may be obtained without charge by contacting the Shareholder
Servicing Agent (see last page for address and phone number).

THIS SAI IS NOT A PROSPECTUS AND IS AUTHORIZED FOR DISTRIBUTION TO PROSPECTIVE
INVESTORS ONLY IF PRECEDED OR ACCOMPANIED BY A CURRENT PROSPECTUS.
<PAGE>

1.  DEFINITIONS
   
   "Fund"                        -- MFS Union Standard(SM) Trust (the
                                    "Trust") is a professionally
                                    managed open-end, management
                                    investment company (a "mutual
                                    fund"). The Trust currently
                                    consists of one series or fund: MFS
                                    Union Standard(SM) Equity Fund (the
                                    "Fund"). Additional funds may be
                                    created by the Trustees from time
                                    to time. The Fund offers its shares
                                    pursuant to a prospectus dated
                                    August 1, 1997, as supplemented or
                                    amended from time to time (the
                                    "Prospectus").
    

   "MFS" or the "Adviser"        -- Massachusetts Financial Services
                                    Company, a Delaware corporation.

   "MFD"                         -- MFS Fund Distributors, Inc., a
                                    Delaware corporation.

   "Prospectus"                  -- The Prospectus of the Fund, dated
                                    August 1, 1997, as amended or
                                    supplemented from time to time.

   
2.  INVESTMENT OBJECTIVE AND POLICIES
    

INVESTMENT OBJECTIVE. The Fund's investment objective is to provide long-term
growth of capital. Any investment involves risk and there can be no assurance
that the Fund will achieve its objective.

   
INVESTMENT POLICIES. The investment policies of the Fund are described in the
Prospectus. In addition, certain of the Fund's investment policies are
described below.

LENDING OF SECURITIES
The Fund may seek to increase its income by lending portfolio securities. Such
loans will usually be made only to member banks of the Federal Reserve System
and to member firms (and subsidiaries thereof) of the New York Stock Exchange
(the "Exchange") and would be required to be secured continuously by collateral
in cash, U.S. Government securities or an irrevocable letter of credit
maintained on a current basis at an amount at least equal to the market value of
the securities loaned. The Fund would have the right to call a loan and obtain
the securities loaned at any time on customary industry settlement notice (which
will usually not exceed five business days). During the existence of a loan, the
Fund would continue to receive the equivalent of the interest or dividends paid
by the issuer on the securities loaned and would also receive compensation based
on investment of the collateral or a fee. The Fund would not, however, have the
right to vote any securities having voting rights during the existence of the
loan, but would call the loan in anticipation of an important vote to be taken
among holders of the securities or of the giving or withholding of their consent
on a material matter affecting the investment. As with other extensions of
credit, there are risks of delay in recovery or even loss of rights in the
collateral shold the borrower fail financially. However, the loans would be made
only to firms deemed by MFS to be of good standing, and when, in the judgment of
MFS, the consideration which could be earned currently from securities loans of
this type justifies the attendant risk. If MFS determines to make securities
loans, it is not intended that the value of the securities loaned would exceed
30% of the value of the Fund's total assets.
    

WHEN-ISSUED SECURITIES
The Fund may purchase securities on a "when-issued" or on a "forward delivery"
basis. It is expected that, under normal circumstances, the Fund will take
delivery of such securities. When the Fund commits to purchase a security on a
"when-issued" or on a "forward delivery" basis, it will set up procedures
consistent with the General Statement of Policy of the Securities and Exchange
Commission (the "SEC") concerning such purchases. Since that policy currently
recommends that an amount of the Fund's assets equal to the amount of the
purchase be held aside or segregated to be used to pay for the commitment, the
Fund will always have liquid assets sufficient to cover any commitments or to
limit any potential risk. However, although each Fund does not intend to make
such purchases for speculative purposes and intends to adhere to the provisions
of SEC policies, purchases of securities on such bases may involve more risk
than other types of purchases. For example, the Fund may have to sell assets
which have been set aside in order to meet redemptions. Also, if the Fund
determines it is necessary to sell the "when-issued" or "forward delivery"
securities before delivery, it may incur a loss because of market fluctuations
since the time the commitment to purchase such securities was made. When the
time comes to pay for "when-issued" or "forward delivery" securities, the Fund
will meet its obligations from the then-available cash flow on the sale of
securities, or, although it would not normally expect to do so, from the sale of
the "when-issued" or "forward delivery" securities themselves (which may have a
value greater or less than the Fund's payment obligation).

REPURCHASE AGREEMENTS
The Fund may enter into repurchase agreements with sellers who are member firms
(or subsidiaries thereof) of the Exchange, members of the Federal Reserve
System, recognized primary U.S. Government securities dealers or institutions
which MFS has determined to be of comparable creditworthiness. The securities
that the Fund purchases and holds through its agent are U.S. Government
securities, the values, including accrued interest, of which are equal to or
greater than the repurchase price agreed to be paid by the seller. The
repurchase price may be higher than the purchase price, the difference being
income to the Fund, or the purchase and repurchase prices may be the same, with
interest at a standard rate due to the Fund together with the repurchase price
on repurchase. In either case, the income to the Fund is unrelated to the
interest rate on the U.S. Government securities.

The repurchase agreement provides that in the event the seller fails to pay the
price agreed upon on the agreed upon delivery date or upon demand, as the case
may be, the Fund will have the right to liquidate the securities. If at the time
the Fund is contractually entitled to exercise its right to liquidate the
securities, the seller is subject to a proceeding under the bankruptcy laws or
its assets are otherwise subject to a stay order, the Fund's exercise of its
right to liquidate the securities may be delayed and result in certain losses
and costs to the Fund. The Fund has adopted and follows procedures which are
intended to minimize the risks of repurchase agreements. For example, the Fund
only enters into repurchase agreements after MFS has determined that the seller
is creditworthy, and MFS monitors the seller's creditworthiness on an ongoing
basis. Moreover, under such agreements, the value, including accrued interest,
of the securities (which are marked to market every business day) is required to
be greater than the repurchase price, and the Fund has the right to make margin
calls at any time if the value of the securities falls below the agreed upon
margin.

OPTIONS

OPTIONS ON SECURITIES -- As noted in the Prospectus, the Fund may write covered
call and put options and purchase call and put options on securities. Call and
put options written by the Fund may be covered in the manner set forth below.

A call option written by the Fund is "covered" if the Fund owns the security
underlying the call or has an absolute and immediate right to acquire that
security without additional cash consideration (or for additional cash
consideration held in a segregated account by its custodian) upon conversion or
exchange of other securities held in its portfolio. A call option is also
covered if the Fund holds a call on the same security and in the same principal
amount as the call written where the exercise price of the call held (a) is
equal to or less than the exercise price of the call written or (b) is greater
than the exercise price of the call written if the difference is maintained by
the Fund in liquid assets in a segregated account with its custodian. A put
option written by the Fund is "covered" if the Fund maintains liquid assets with
a value equal to the exercise price in a segregated account with its custodian,
or else holds a put on the same security and in the same principal amount as the
put written where the exercise price of the put held is equal to or greater than
the exercise price of the put written or where the exercise price of the put
held is less than the exercise price of the put written if the difference is
maintained by the Fund in liquid assets in a segregated account with its
custodian. Put and call options written by the Fund may also be covered in such
other manner as may be in accordance with the requirements of the exchange on
which, or the counterparty with which, the option is traded, and applicable laws
and regulations. If the writer's obligation is not so covered, it is subject to
the risk of the full change in value of the underlying security from the time
the option is written until exercise.

Effecting a closing transaction in the case of a written call option will permit
the Fund to write another call option on the underlying security with either a
different exercise price or expiration date or both, or in the case of a written
put option will permit the Fund to write another put option to the extent that
the exercise price thereof is secured by liquid assets. Such transactions permit
the Fund to generate additional premium income, which will partially offset
declines in the value of portfolio securities or increases in the cost of
securities to be acquired. Also, effecting a closing transaction will permit the
cash or proceeds from the concurrent sale of any securities subject to the
option to be used for other investments of the Fund, provided that another
option on such security is not written. If the Fund desires to sell a particular
security from its portfolio on which it has written a call option, it will
effect a closing transaction in connection with the option prior to or
concurrent with the sale of the security.

The Fund will realize a profit from a closing transaction if the premium paid in
connection with the closing of an option written by the Fund is less than the
premium received from writing the option, or if the premium received in
connection with the closing of an option purchased by the Fund is more than the
premium paid for the original purchase. Conversely, the Fund will suffer a loss
if the premium paid or received in connection with a closing transaction is more
or less, respectively, than the premium received or paid in establishing the
option position. Because increases in the market price of a call option will
generally reflect increases in the market price of the underlying security, any
loss resulting from the repurchase of a call option previously written by the
Fund is likely to be offset in whole or in part by appreciation of the
underlying security owned by the Fund.

The Fund may write options in connection with buy-and-write transactions; that
is, the Fund may purchase a security and then write a call option against that
security. The exercise price of the call the Fund determines to write will
depend upon the expected price movement of the underlying security. The exercise
price of a call option may be below ("in-the-money"), equal to ("at- the-money")
or above ("out-of-the-money") the current vlaue of the underlying security at
the time the option is written. Buy-and-write transactions using in-the-money
call options may be used when it is expected that the price of the underlying
security will decline moderately during the option period. Buy- and-write
transactions using out-of-the-money call options may be used when it is expected
that the premiums received from writing the call option plus the appreciation in
the market price of the underlying security up to the exercise price will be
greater than the appreciation in the price of the underlying security alone. If
the call options are exercised in such transactions, the Fund's maximum gain
will be the premium received by it for writing the option, adjusted upwards or
downwards by the difference between the Fund's purchase price of the security
and the exercise price, less related transaction costs. If the options are not
exercised and the price of the underlying security declines, the amount of such
decline will be offset in part, or entirely by the premium received.

The writing of covered put options is similar in terms of risk/return
characteristics to buy-and-write transactions. If the market price of the
underlying security rises or otherwise is above the exercise price, the put
option will expire worthless and the Fund's gain will be limited to the premium
received, less related transaction costs. If the market price of the underlying
security declines or otherwise is below the exercise price, the Fund may elect
to close the position or retain the option until it is exercised, at which time
the Fund will be required to take delivery of the security at the exercise
price; the Fund's return will be the premium received from the put option minus
the amount by which the market price of the security is below the exercise
price, which could result in a loss. Out-of-the-money, at-the-money and
in-the-money put options may be used by the Fund in the same market environments
that call options are used in equivalent buy-and-write transactions.

The Fund may also write combinations of put and call options on the same
security, known as "straddles," with the same exercise price and expiration
date. By writing a straddle, the Fund undertakes a simultaneous obligation to
sell and purchase the same security in the event that one of the options is
exercised. If the price of the security subsequently rises sufficiently above
the exercise price to cover the amount of the premium and transaction costs, the
call will likely be exercised and the Fund will be required to sell the
underlying security at a below market price. This loss may be offset, however,
in whole or part, by the premiums received on the writing of the two options.
Conversely, if the price of the security declines by a sufficient amount, the
put will likely be exercised. The writing of straddles will likely be effective,
therefore, only where the price of the security remains stable and neither the
call nor the put is exercised. In those instances where one of the options is
exercised, the loss on the purchase or sale of the underlying security may
exceed the amount of the premiums received.

By writing a call option, the Fund limits its opportunity to profit from any
increase in the market value of the underlying security above the exercise price
of the option. By writing a put option, the Fund assumes the risk that it may be
required to purchase the underlying security for an exercise price above its
then current market value, resulting in a capital loss unless the security
subsequently appreciates in value. The writing of options on securities will not
be undertaken by the Fund solely for hedging purposes, and could involve certain
risks which are not present in the case of hedging transactions. Moreover, even
where options are written for hedging purposes, such transactions constitute
only a partial hedge against declines in the value of portfolio securities or
against increases in the value of securities to be acquired, up to the amount of
the premium.

The Fund may purchase options for hedging purposes or to increase its return.
Put options may be purchased to hedge against a decline in the value of
portfolio securities. If such decline occurs, the put options will permit the
Fund to sell the securities at the exercise price, or to close out the options
at a profit. By using put options in this way, the Fund will reduce any profit
if might otherwise have realized in the underlying security by the amount of the
premium paid for the put option and by transaction costs.

The Fund may purchase call options to hedge against an increase in the price of
securities that the Fund anticipates purchasing in the future. If such increase
occurs, the call option will permit the Fund to Purchase the securities at the
exercise price, or to close out the options at a profit. The premium paid for
the call option plus any transaction costs will reduce the benefit, if any,
realized by the Fund upon exercise of the option, and, unless the price of the
underlying security rises sufficiently, the option may expire worthless to the
Fund.

OPTIONS ON STOCK INDICES -- As noted in the Prospectus, the Fund may write
(sell) covered call and put options and purchase call and put options on stock
indices. In contrast to an option on a security, an option on a stock index
provides the holder with the right but not the obligation to make or receive a
cash settlement upon exercise of the option, rather than the right to purchase
or sell a security. The amount of this settlement is equal to (i) the amount, if
any, by which the fixed exercise price of the option exceeds (in the case of a
call) or is below (in the case of a put) the closing value of the underlying
index on the date of exercise, multiplied by (ii) a fixed "index multiplier."

The Fund may cover call options on stock indices by owning securities whose
price changes, in the opinion of MFS, are expected to be siimilar to those of
the underlying index, or by having an absolute and immediate right to acquire
such securities without additional cash consideration (or for additional cash
consideration held in a segregated account by its custodian) upon conversion or
exchange of other securities in its portfolio. Where the Fund covers a call
option on a stock index through ownership of securities, such securities may not
match the composition of the index and, in that event, the Fund will not be
fully covered and could be subject to risk of loss in the event of adverse
changes in the value of the index. The Fund may also cover call options on stock
indices by holding a call on the same index and in the same principal amount as
the call written where the exercise price of the call held (a) is equal to or
less than the exercise price of the call written or (b) is greater than the
exercise price of the call written if the difference is maintained by the Fund
in liquid assets in a segregated account with its custodian. The Fund may cover
put options on stock indices by maintaining liquid assets with a value equal to
the exercise price in a segregated account with its custodian, or by holding a
put on the same stock index and in the same principal amount as the put written
where the exercise price of the put held is equal to or greater than the
exercise price of the put written or where the exercise price of the put held is
less than the exercise price of the put written if the difference is maintained
by the Fund in liquid assets, a segregated account with its custodian. Put and
call options on stock indices may also be covered in such other manner as may be
in accordance with the rules of the exchange on which, or the counterparty with
which, the option is traded and applicable laws and regulations.

The Fund will receive a premium from writing a put or call option, which
increases the Fund's gross income in the event the option expires unexercised or
is closed out at a profit. If the value of an index on which the Fund has
written a call option falls or remains the same, the Fund will realize a profit
in the form of the premium received (less transaction costs) that could offset
all or a portion of any decline in the value of the securities it owns. If the
value of the index rises, however, the Fund will realize a loss in its call
option position, which will reduce the benefit of any unrealized appreciation in
the Fund's stock investments. By writing a put option, the Fund assumes the risk
of a decline in the index. To the extent that the price changes of securities
owned by the Fund correlate with changes in the value of the index, writing
covered put options on indices will increase the Fund's losses in the event of a
market decline, although such losses will be offset in part by the premium
received for writing the option.

The Fund may also purchase put options on stock indices to hedge its investments
against a decline in value. By purchasing a put option on a stock index, the
Fund will seek to offset a decline in the value of securities it owns through
appreciation of the put option. If the value of the Fund's investments does not
decline as anticipated, or if the value of the option does not increase, the
Fund's loss will be limited to the premium paid for the option plus related
transaction costs. The success of this strategy will largely depend on the
accuracy of the correlation between the changes in value of the index and the
changes in value of the Fund's security holdings.

The purchase of call options on stock indices may be used by the Fund to attempt
to reduce the risk of missing a broad market advance, or an advance in an
industry or market segment, at a time when the Fund holds uninvested cash or
short-term debt securities awaiting investment. When purchasing call options for
this purpose, the Fund will also bear the risk of losing all or a portion of the
premium paid if the value of the index does not rise. The purchase of call
options on stock indices when the Fund is substantially fully invested is a form
of leverage, up to the amount of the premium and related transaction costs, and
involves risks of loss and of increased volatility similar to those involved in
purchasing calls on securities the Fund owns.

The index underlying a stock index option may be a "broad-based" index, such as
the Standard & Poor's 500 Index or the New York Stock Exchange Composite Index,
the changes in value of which ordinarily will reflect movements in the stock
market in general. In contrast, certain options may be based on narrower market
indices, such as the Standard & Poor's 100 Index, or on indices of securities of
particular industry groups, such as those of oil and gas or technology
companies. A stock index assigns relative values to the sotcks included in the
index and the index fluctuates with changes in the market values of the stocks
so included. The composition of the index is changed periodically.

FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS

FUTURES CONTRACTS -- As noted in the Prospectus, the Fund may purchase and sell
futures contracts on stock indices ("Futures Contracts"). Such investment
strategies will be used for hedging purposes and for non-hedging purposes,
subject to applicable law.

A Futures Contract is a bilateral agreement providing for the purchase and sale
of a specified type and amount of a financial instrument, or for the making and
acceptance of a cash settlement, at a stated time in the future for a fixed
price. By its terms, a Futures Contract provides for a specified settlement date
on which the difference between the price at which the contract was entered into
and the contract's closing value is settled between the purchaser and seller in
cash. Futures Contracts differ from options in that they are bilateral
agreements, with both the purchaser and the seller equally obligated to complete
the transaction. Futures Contracts call for settlement only on the expiration
date and cannot be "exercised" at any other time during their term.

The purchase or sale of a Futures Contract differs from the purchase or sale of
a security or the purchase of an option in that no purchase price is paid or
received. Instead, an amount of cash or cash equivalents which varies but may be
as low as 5% or less of the value of the contract, must be deposited with the
broker as "initial margin." Subsequent payments to and from the broker, referred
to as "variation margin," are made on a daily basis as the value of the index
underlying the Futures Contract fluctuates, making positions in the Futures
Contract more or less valuable - a process known as "marking to the market."

Purchases or sales of stock index futures contracts are used to attempt to
protect the Fund's current or intended stock investments from broad fluctuations
in stock prices. For example, the Fund may sell stock index futures contracts in
anticipation of or during a market decline to attempt to offset the decrease in
market value of the Fund's securities portfolio that might otherwise result. If
such decline occurs, the loss in value of portfolio securities may be offset, in
whole or part, by gains on the futures position. When the Fund is not fully
invested in the securities market and anticipates a significant market advance,
it may purchase stock index futures contracts in order to gain rapid market
exposure that may, in part or entirely, offset increases in the cost of
securities that the Fund intends to purchase. As such purchases are made, the
corresponding positions in stock index futures contracts will be closed out. In
a substantial majority of these transactions, the Fund will purchase such
securities upon termination of the futures position, but under unusual market
conditions, a long futures position may be terminated without a related purchase
of securities.

OPTIONS ON FUTURES CONTRACTS -- As noted in the Prospectus, the Fund may
purchase and write options to buy or sell futures contracts in which it may
invest ("Options on Futures Contracts"). Such investment strategies will be used
for hedging purposes and for non-hedging purposes, subject to applicable law.

An Option on a Futures Contract provides the holder with the right to enter into
a "long" position in the underlying Futures Contract, in the case of a call
option, or a "short" position in the underlying Futures Contract, in the case of
a put option, at a fixed exercise price up to a stated expiration date or, in
the case of certain options, on such date. Upon exercise of the option by the
holder, the contract market clearinghouse establishes a corresponding short
position for the writer of the option, in the case of a call option, or a
corresponding long position in the case of a put option. In the event that an
option is exercised, the parties will be subject to all the risks associated
with the trading of Futures Contracts, such as payment of initial and variation
margin deposits. In addition, the writer of an Option on a Futures Contract,
unlike the holder, is subject to initial and variation margin requirements on
the option position.

A position in an Option on a Futures Contract may be terminated by the purchaser
or seller prior to expiration by effecting a closing purchase or sale
transaction, subject to the availability of a liquid secondary market which is
the purchase or sale of an option of the same series (i.e., the same exercise
price and expiration date) as the option previously purchased or sold. The
difference between the premiums paid and received represents the trader's profit
or loss on the transaction.

Options on Futures Contracts that are written or purchased by the Fund on U.S.
exchanges are traded on the same contract market as the underlying Futures
Contract, and, like Futures Contracts, are subject to regulation by the
Commodity Futures Trading Commission (the "CFTC") and the performance guarantee
of the exchange clearinghouse.

The Fund may cover the writing of call Options on Futures Contract. (a) through
purchases of the underlying Futures Contract, (b) through ownership of the
instrument, or instruments included in the index underlying the Futures
Contract, or (c) through the holding of a call on the same Futures Contract and
in the same principal amount as the call written where the exercise price of the
call held (i) is equal to or less than the exercise price of the call written or
(ii) is greater than the exercise price of the call written if the difference is
maintained by the Fund in liquid assets in a segregated account with its
custodian The Fund may cover the writing of put Options on Futures Contracts (a)
through sales of the underlying Futures Contract, (b) through segregation of
liquid assets in an amount equal to the value of the security or index
underlying the Futures Contract, or (c) through the holding of a put on the same
Futures Contract and in the same principal amount as the put written where the
exercise price of the put held is equal to or greater than the exercise price of
the put written or where the exercise price of the put held is less than the
exercise price of the put written if the difference is maintained by the Fund in
liquid assets in a segregated account with its custodian. Put and call Options
on Futures Contracts may also be covered in such other manner as may be in
accordance with the rules of the exchange on which the option is traded and
applicable laws and regulations. Upon the exercise of a call Option on a Futures
Contract written by the Fund, the Fund will be required to sell the underlying
Futures Contract which, if the Fund has covered its obligation through the
purchase of such Contract, will serve to liquidate its futures position.
Similarly, where a put Option on a Futures Contract written by the Fund is
exercised, the Fund will be required to purchase the underlying Futures Contract
which, if the Fund has covered its obligation through the sale of such Contract,
will close out its futures position.

The writing of a call option on a Futures Contract for hedging purposes
constitutes a partial hedge against declining prices of the securities or other
instruments required to be delivered under the terms of the Futures Contract. If
the futures price at expiration of the option is below the exercise price, the
Fund will retain the full amount of the option premium, less related transaction
costs, which provides a partial hedge against any decline that may have occurred
in the Fund's portfolio holdings. The writing of a put option on a Futures
Contract constitutes a partial hedge against increasing prices of the securities
or other instruments required to be delivered under the terms of the Futures
Contract. If the futures price at expiration of the option is higher than the
exercise price, the Fund will retain the full amount of the option premium which
provides a partial hedge against any increase in the price of securities which
the Fund intends to purchase. If a put or call option the Fund has written is
exercised, the Fund will incur a loss which will be reduced by the amount of the
premium it receives. Depending on the degree of correlation between changes in
the value of its portfolio securities and the changes in the value of its
futures positions, the Fund's losses from existing Options on Futures Contracts
may to some extent be reduced or increased by changes in the value of portfolio
securities.

The Fund may purchase Options on Futures Contracts for hedging purposes instead
of purchasing or selling the underlying Futures Contracts. For example, where a
decrease in the value of portfolio securities is anticipated as a result of a
projected market-wide decline the Fund could, in lieu of selling Futures
Contracts, purchase put options thereon. In the event that such decrease occurs,
it may be offset, in whole or part, by a profit on the option. Conversely, where
it is projected that the value of securities to be acquired by the Fund will
increase prior to acquisition, due to a market advance the Fund could purchase
call Options on Futures Contracts, rather than purchasing the underlying Futures
Contracts.

RISK FACTORS IN OPTIONS AND FUTURES TRANSACTIONS

RISK OF IMPERFECT CORRELATION OF HEDGING INSTRUMENTS WITH THE FUND'S PORTFOLIO.
The Fund's ability effectively to hedge all or a portion of its portfolio
through transactions in options, Futures Contracts and Options on Futures
Contracts depend on the degree to which price movements in the underlying index
or instrument correlate with price movements in the relevant portion of the
Fund's portfolio. In the case of futures and options based on an index, the
portfolio will not duplicate the components of the index. As a result, the
correlation probably will not be exact. Consequently, the Fund bears the risk
that the price of the portfolio securities being hedged will not move in the
same amount or direction as the underlying index or obligation.

For example, if the Fund purchases a put option on an index and the index
decreases less than the value of the hedged securities, the Fund would
experience a loss which is not completely offset by the put option. It is also
possible that there may be a negative correlation between the index or
obligation underlying an option or Futures Contract in which the Fund has a
position and the portfolio securities the Fund is attempting to hedge, which
could result in a loss on both the portfolio and the hedging instrument.

It should be noted that stock index futures contracts or options based upon a
narrower index of securities, such as those of a particular industry group, may
present greater risk than options or futures based on a broad market index. This
is due to the fact that a narrower index is more susceptible to rapid and
extreme fluctuations as a result of changes in the value of a small number of
securities. Nevertheless, where the Fund enters into transactions in options or
futures on narrow-based indices for hedging purposes, movements in the value of
the index should, if the hedge is successful, correlate closely with the portion
of the Fund's portfolio or the intended acquisitions being hedged.

The trading of Futures Contracts and options for hedging purposes entails the
additional risk of imperfect correlation between movements in the futures or
option price and the price of the underlying index or obligation. The
anticipated spread between the prices may be distorted due to the differences in
the nature of the markets, such as differences in margin requirements, the
liquidity of such markets and the participation of speculators in the options
and futures markets. In this regard, trading by speculators in options and
Futures Contracts has in the past occasionally resulted in market distortions,
which may be difficult or impossible to predict, particularly near the
expiration of such Contracts.

The trading of Options on Futures Contracts also entails the risk that changes
in the value of the underlying Futures Contract will not be fully reflected in
the value of the option. The risk of imperfect correlation, however, generally
tends to diminish as the maturity date of the Futures Contract or expiration
date of the option approaches.

Further, with respect to options on securities, options on stock indices and
Options on Futures Contracts, the Fund is subject to the risk of market
movements between the time that the option is exercised and the time of
performance thereunder. This could increase the extent of any loss suffered by
the Fund in connection with such transactions.

In writing a covered call option on a security, index or Futures Contract, the
Fund also incurs the risk that changes in the value of the instruments used to
cover the position will not correlate closely with changes in the value of the
option or underlying index or instrument. For example, where the Fund covers a
call option written on a stock index through segregation of securities, such
securities may not match the composition of the index, and the Fund may not be
fully covered. As a result, the Fund could be subject to risk of loss in the
event of adverse market movements.

The writing of options on securities, options on stock indices or Options on
Futures Contracts constitutes only a partial hedge against fluctuations in the
value of the Fund's portfolio. When the Fund writes an option, it will receive
premium income in return for the holder's purchase of the right to acquire or
dispose of the underlying obligation. In the event that the price of such
obligation does not rise sufficiently above the exercise price of the option, in
the case of a call, or fall below the exercise price, in the case of a put, the
option will not be exercised and the Fund will retain the amount of the premium,
less related transaction costs, which will constitute a partial hedge against
any decline that may have occurred in the Fund's portfolio holdings or any
increase in the cost of the instruments to be acquired.

Where the price of the underlying obligation moves sufficiently in favor of the
holder to warrant exercise of the option, however, and the option is exercised,
the Fund will incur a loss which may only be partially offset by the amount of
the premium it received. Moreover, by writing an option, the Fund may be
required to forgo the benefits which might otherwise have been obtained from an
increase in the value of portfolio securities or other assets or a decline in
the value of securities or assess to be acquired.

In the event of the occurrence of any of the foregoing adverse market events,
the Fund's overall return may be lower than if it had not engaged in the hedging
transactions.

The Fund may enter into transactions in options, Futures Contracts and Options
on Futures Contracts not only for hedging purposes, but also for non-hedging
purposes intended to increase portfolio returns. Non-hedging transactions in
such investments involve greater risks and may result in losses which may not be
offset by increases in the value of portfolio securities or declines in the cost
of securities to be acquired. The Fund will only write covered options, such
that cash or securities necessary to satisfy an option exercise will be
segregated at all times, unless the option is covered in such other manner as
may be in accordance with the rules of the exchange on which the option is
traded and applicable laws and regulations. Nevertheless, the method of covering
an option employed by the Fund may not fully protect it against risk of loss
and, in any event, the Fund could suffer losses on the option position which
might not be offset by corresponding portfolio gains.

With respect to the writing of straddles on securities, the Fund incurs the risk
that the price of the underlying security will not remain stable, that one of
the options written will be exercised and that the resulting loss will not be
offset by the amount of the premiums received. Such transactions, therefore,
create an opportunity for increased return by providing the Fund with two
simultaneous premiums on the same security, but involve additional risk, since
the Fund may have an option exercised against it regardless of whether the price
of the security increases or decreases.

RISK OF A POTENTIAL LACK OF A LIQUID SECONDARY MARKET. Prior to exercise or
expiration, a futures or option position can only be terminated by entering into
a closing purchase or sale transaction. This requires a secondary market for
such instruments on the exchange on which the initial transaction was entered
into. While the Fund will enter into options or futures positions only if there
appears to be a liquid secondary market therefor, there can be no assurance that
such a market will exist for any particular contracts at any specific time. In
that event, it may not be possible to close out a position held by the Fund, and
the Fund could be required to purchase or sell the instrument underlying an
option, make or receive a cash settlement or meet ongoing variation margin
requirements. Under such circumstances, if the Fund has insufficient cash
available to meet margin requirements, it will be necessary to liquidate
portfolio securities or other assets at a time when it is disadvantageous to do
so. The inability to close out options and futures positions, therefore, could
have an adverse impact on the Fund's ability effectively to hedge its portfolio,
and could result in trading losses.

The liquidity of a secondary market in a Futures Contract or option thereon may
be adversely affected by "daily price fluctuation limits," established by
exchanges, which limit the amount of fluctuation in the price of a contract
during a single trading day. Once the daily limit has been reached in the
contract, no trades may be entered into at a price beyond the limit, thus
preventing the liquidation of open futures or option positions and requiring
traders to make additional margin deposits. Prices have in the past moved the
daily limit on a number of consecutive trading days.

The trading of Futures Contracts and options is also subject to the risk trading
halts, suspensions, exchange or clearinghouse equipment failures, government
intervention, insolvency of a brokerage firm or clearinghouse or other
disruptions of normal trading activity, which could at times make it difficult
or impossible to liquidate existing positions or to recover excess variation
margin payments.

MARGIN. Because of low initial margin deposits made upon the opening of a
futures or forward position and the writing of an option, such transactions
involve substantial leverage. As a result, relatively, small movements in the
price of the contract can result in substantial unrealized gains or losses.
Where the Fund enters into such transactions for hedging purposes, any losses
incurred in connection therewith should, if the hedging strategy is successful,
be offset, in whole or in part, by increases in the value of securities or other
assets held by the Fund or decreases in the prices of securities or other assets
the Fund intends to acquire. Where the Fund enters into such transactions for
other than hedging purposes, the margin requirements associated with such
transactions could expose the Fund to greater risk.

TRADING AND POSITION LIMITS. The exchanges on which futures and options are
traded may impose limitations governing the maximum number of positions on the
same side of the market and involving the same underlying instrument which may
be held by a single investor, whether acting alone or in concert with others
(regardless of whether such contracts are held on the same or different
exchanges or held or written in one or more accounts or through one or more
brokers). Further, the CFTC and the various contract markets have established
limits referred to as "speculative position limits" on the maximum net long or
net short position which any person may hold or control in a particular futures
or option contract. An exchange may order the liquidation of positions found to
be in violation of these limits and it may impose other sanctions or
restrictions. The Adviser does not believe that these trading and position
limits will have any adverse impact on the strategies for hedging the portfolio
of the Fund.

RISKS OF OPTIONS ON FUTURES CONTRACTS. The amount of risk the Fund assumes when
it purchases an Option on a Futures Contract is the premium paid for the option,
plus related transaction costs. In order to profit from an option purchased,
however, it may be necessary to exercise the option and to liquidate the
underlying Futures Contract subject to the risks of the availability of a liquid
offset market describe herein. The writer of an Option on a Futures Contract is
subject to the risks of commodity futures trading, including the requirement of
initial and variation margin payments, as well as the additional risk that
movements in the price of the option may not correlate with movements in the
price of the underlying security, index or Futures Contract.

POLICIES ON THE USE OF FUTURES AND OPTIONS ON FUTURES CONTRACTS. In order to
assure that the Fund will not be deemed to be a "commodity pool" for purposes of
the Commodity Exchange Act, regulations of the CFTC require that the Fund enter
into transactions in Futures Contracts and Options on Futures Contracts only (i)
for bona fide hedging purposes (as defined in CFTC regulations), or (ii) for
non-hedging purposes, provided that the aggregate initial margin and premiums on
such non-hedging positions does not exceed 5% of the liquidation value of the
Fund's assets.

The Fund has adopted the additional restriction that it will not enter into a
Futures Contract if, immediately thereafter, the value of securities and other
obligations underlying all such Futures Contracts would exceed 50% of the value
of the Fund's total assets. Moreover, the Fund will not purchase put and call
options if as a result more than 5% of its total assets would be invested in
such options.

When the Fund purchases a Futures Contract, an amount of cash or securities will
be deposited in a segregated account with the Fund's custodian so that the
amount so segregated will at all times equal the value of the Futures Contract,
thereby assuring that the leveraging effect of such Futures Contract is
minimized.

The staff of the SEC has taken the position that purchased over-the-counter
options and assets used to cover written over-the-counter options are illiquid
and, therefore, together with other illiquid securities held by a Fund, cannot
exceed 15% of the Fund's assets (the "SEC illiquidity ceiling"). Although MFS
disagrees with this position, the Adviser intends to limit the Fund's writing of
over-the-counter options in accordance with the following procedure. Except as
provided below, the Fund intends to write over-the-counter options only with
primary U.S. Government securities dealers recognized as such by the Federal
Reserve Bank of New York. Also, the contracts the Fund has in place with such
primary dealers provide that the Fund has the absolute right to repurchase an
option it writes at any time at a price which represents the fair market value,
as determined in good faith through negotiation between the parties, but which
in no event will exceed a price determined pursuant to a formula in the
contract. Although the specific formula may vary between contracts with
different primary dealers, the formula generally is based on a multiple of the
premium received by the Fund for writing the option, plus the amount, if any of
the option's intrinsic value (i.e., the amount that the option is in-the-money).
The formula may also include a factor to account for the difference between the
price of the security and the strike price of the option if the option is
written out-of-the-money. The Fund will treat all or a portion of the formula as
illiquid for purposes of the SEC illiquidity ceiling test imposed by the SEC
staff. The Fund may also write over-the-counter options with non-primary dealers
and will treat the assets used to cover these options as illiquid for purposes
of such SEC illiquidity ceiling test.

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

The Fund's limitations, policies and ratings restrictions are adhered to at the
time of purchase or utilization of assets; a subsequent change in circumstances
will not be considered to result in a violation of policy.

   
3.  INVESTMENT RESTRICTIONS
The Fund has adopted the following restrictions which cannot be changed without
the approval of the holders of a majority of the Fund's shares (which, as used
in this SAI, means the lesser of (i) more than 50% of the outstanding shares of
the Trust or the Fund, as applicable, or (ii) 67% or more of the outstanding
shares of the Trust or the Fund, as applicable, present at a meeting if holders
of more than 50% of the outstanding shares of the Trust or the Fund, as
applicable, are represented in person or by proxy). Except for Investment
Restriction (1) and nonfundamental investment policy (1), these investment
restrictions and policies are adhered to at the time of purchase or utilization
of assets; a subsequent change in circumstances will not be considered to result
in a violation of policy.
    

The Trust, on behalf of the Fund, may not:

    (1) borrow amounts in excess of 33 1/3% of its assets including amounts
  borrowed;

    (2) underwrite securities issued by other persons except insofar as the Fund
  may technically be deemed an underwriter under the Securities Act of 1933 in
  selling a portfolio security;

    (3) purchase or sell real estate (including limited partnership interests
  but excluding securities secured by real estate or interests therein and
  securities of companies, such as real estate investment trusts, which deal in
  real estate or interests therein), interests in oil, gas or mineral leases,
  commodities or commodity contracts (excluding Options, Options on Futures
  Contracts, Options on Stock Indices and any other type of option, and Futures
  Contracts) in the ordinary course of its business. The Fund reserves the
  freedom of action to hold and to sell real estate, mineral leases, commodities
  or commodity contracts (including Options, Options on Futures Contracts,
  Options on Stock Indices and any other type of option, and Futures Contracts)
  acquired as a result of the ownership of securities;

    (4) issue any senior securities except as permitted by the Investment
  Company Act of 1940 (the "1940 Act"). For purposes of this restriction,
  collateral arrangements with respect to any type of option (including Options
  on Futures Contracts, Options and Options on Stock Indices), Forward Contracts
  and Futures Contracts and collateral arrangements with respect to initial and
  variation margin are not deemed to be the issuance of a senior security;

    (5) make loans to other persons. For these purposes, the purchase of
  short-term commercial paper, the purchase of a portion or all of an issue of
  debt securities, the lending of portfolio securities, or the investment of the
  Fund's assets in repurchase agreements, shall not be considered the making of
  a loan; or

    (6) purchase any securities of an issuer of a particular industry, if as a
  result, 25% or more of its gross assets would be invested in securities of
  issuers whose principal business activities are in the same industry (except
  obligations issued or guaranteed by the U.S. Government or its agencies and
  instrumentalities and repurchase agreements collateralized by such
  obligations).

In addition, the Fund has adopted the following nonfundamental policies which
may be changed without shareholder approval. The Trust, on behalf of the Fund,
will not:

    (1) invest in illiquid investments, including securities subject to legal or
  contractual restrictions on resale or for which there is no readily available
  market (e.g., trading in the security is suspended or, in the case of unlisted
  securities, where no market exists) if more than 15% of the Fund's net assets
  (taken at market value) would be invested in such securities. Repurchase
  agreements maturing in more than seven days will be deemed to be illiquid for
  purposes of the Fund's limitation on investment in illiquid securities.
  Securities that are not registered under the Securities Act of 1933, as
  amended and sold in reliance on Rule 144A thereunder, but are determined to be
  liquid by the Trust's Board of Trustees (or its delegee), will not be subject
  to this 15% limitation;

    (2) invest more than 5% of the value of the Fund's net assets valued at the
  lower of cost or market, in warrants. Included within such amount, but not to
  exceed 2% of the value of the Fund's net assets, may be warrants which are not
  listed on the New York or American Stock Exchange. Warrants acquired by the
  Fund in units or attached to securities may be deemed to be without value;

    (3) purchase securities issued by any other investment company in excess of
  the amount permitted by the 1940 Act, except when such purchase is part of a
  plan of merger or consolidation; currently, the Fund does not intend to invest
  more than 5% of its net assets in such securities;

    (4) purchase or retain securities of an issuer any of whose officers,
  directors, trustees or security holders is an officer or trustee of the Fund,
  or is an officer or a director of the investment adviser of the Fund, if one
  or more of such persons also owns beneficially more than 0.5% of the
  securities of such issuer, and such persons owning more than 0.5% of such
  securities together own beneficially more than 5% of such securities;

    (5) purchase any securities or evidences of interest therein on margin,
  except that the Fund may obtain such short-term credit as may be necessary for
  the clearance of any transaction and except that the Fund may make margin
  deposits in connection with any type of option (including Options on Futures
  Contracts, Options and Options on Stock Indices) and Futures Contracts;

    (6) sell any security which the Fund does not own unless by virtue of its
  ownership of other securities the Fund has at the time of sale a right to
  obtain securities without payment of further consideration equivalent in kind
  and amount to the securities sold and provided that if such right is
  conditional, the sale is made upon the same conditions;

    (7) invest more than 5% of its gross assets in companies which, including
  predecessors, controlling persons, sponsoring entities, general partners and
  guarantors, have a record of less than three years' continuous operation or
  relevant business experience;

    (8) pledge, mortgage or hypothecate in excess of 33 1/3% of its gross
  assets. For purposes of this restriction, collateral arrangements with respect
  to any type of option (including Options on Futures Contracts, Options and
  Options on Stock Indices), Futures Contracts and payments of initial and
  variation margin in connection therewith, are not considered a pledge of
  assets;

    (9) purchase securities while borrowings from banks under a line of credit
  or similar arrangement exceed 5% of the Fund's total assets;

   
    (10) purchase or sell any put or call option or any combination thereof,
  provided that this shall not prevent (a) the purchase, ownership, holding or
  sale of (i) warrants where the grantor of the warrants is the issuer of the
  underlying securities or (ii) put or call options or combinations thereof with
  respect to securities, indexes of securities, Options on Futures Contracts or
  (b) the purchase, ownership, holding or sale of contracts for the future
  delivery of securities or currencies;

    (11) invest for the purpose of exercising control or management; or

    (12) borrow, except as a temporary measure for extraordinary or emergency
  purposes.

4.  MANAGEMENT OF THE FUND
The Board of Trustees of the Trust provides broad supervision over the affairs
of the Fund. MFS is responsible for the investment management of the Fund's
assets and the officers of the Trust are responsible for its operations. The
Trustees and officers of the Trust are listed below, together with their
principal occupations during the past five years. (Their titles may have varied
during that period.)

TRUSTEES
A. KEITH BRODKIN,* Chairman and President (born 8/4/35)
Massachusetts Financial Services Company, Chairman

NELSON J. DARLING, JR. (born 12/27/20)
Director or Trustee of several corporations or trusts, including Eastern
  Enterprises (diversified holding company), Trustee
Address: 27 School Street, Boston, Massachusetts

WILLIAM R. GUTOW (born 9/27/41)
Private Investor; Real Estate Consultant; Capitol Entertainment (Blockbuster
  Video Franchise), Vice Chairman
Address: 3102 Maple Avenue, #100, Dallas, Texas

OFFICERS
W. THOMAS LONDON,* Treasurer (born 3/1/44)
Massachusetts Financial Services Company, Senior Vice President

STEPHEN E. CAVAN,* Secretary and Clerk (born 11/6/53)
Massachusetts Financial Services Company, Senior Vice President, General
  Counsel and Assistant Secretary

JAMES R. BORDEWICK, JR.,* Assistant Secretary (born 3/6/59)
Massachusetts Financial Services Company, Senior Vice President and Associate
  General Counsel

JAMES 0. YOST,* Assistant Treasurer (born 6/12/60)
Massachusetts Financial Services Company, Vice President

MARK E. BRADLEY,* Assistant Treasurer (born 11/23/59)
Massachusetts Financial Services Company, Vice President (since March 1997);
  Putnam Investments, Vice President (from September 1994 until March 1997);
  Ernst & Young, Senior Tax Manager (until September 1994).

ELLEN M. MOYNIHAN,* Assistant Treasurer (born 11/13/57)
Massachusetts Financial Services Company, Vice President (since September
  1996); Deloitte & Touche LLP, Senior Manager (until September 1996).
- ----------
*"Interested persons" (as defined in the 1940 Act) of the Adviser, whose address
 is 500 Boylston Street, Boston, Massachusetts 02116.
    

Mr. Brodkin and each officer holds comparable positions with certain affiliates
of MFS or with certain other funds of which MFS or a subsidiary is the
investment adviser or distributor. Messrs. Brodkin and Cavan are the Chairman
and the Secretary, respectively, of MFD and hold similar positions with certain
other MFS affiliates.

TRUSTEE COMPENSATION TABLE
The Trust pays the compensation of the Trustees who are not officers of MFS (who
will each receive $1,300 annually plus $150 per meeting and $150 per committee
meeting attended). Set forth below is certain information concerning the cash
compensation paid to the Trustees.

                                      TRUSTEE FEES     TOTAL TRUSTEE FEES
                                          FROM           FROM THE FUND
NAME OF TRUSTEE                         FUND(1)            COMPLEX(2)
- ---------------                         -------            ----------
A. Keith Brodkin ................       $    O              $     0
Nelson J. Darling ...............        2,800               25,133
William R. Gutow ................        2,800               25,133

   
NOTES:
(1) For fiscal year ended September 30, 1996.
(2) For calendar year 1996. All Trustees receiving compensation served as
    Trustees of 18 funds within the MFS Fund Complex (having aggregate net
    assets at December 31, 1996, of approximately $696.4 million).

As of July 1, 1997, the Trustees and officers, as a group, owned less than 1% of
the Fund's shares outstanding on that date.

As of July 1, 1997, U F C W Participating Food Ind. Employers Tri-State Pension
Fund, Pennsakauken, NJ, 08109-3377 was the record owner of 29.21% of the
outstanding shares of the Fund. As of July 1, 1997, C W A Pension & Death
Benefit Trust, Washington, D.C., 10001-2760 was the record owner of 14.27% of
the outstanding shares of the Fund. As of July 1, 1997, Equity League Pension
Trust Fund Amivest Corp Discretionary Investment Manager, New York, New York
10005-2501 was the record owner of 6.06% of the outstanding shares of the Fund.
As of July 1, 1997, Savannah ILA Employers Pension Plan was the record owner of
approximately 12.10% of the outstanding shares of the Fund. As of July 1, 1997,
International Longshoremens Assoc., Southeast Florida Ports Employers Pension
Fund, Miami, Florida 33132-1959 was the record owner of approximately 12.24% of
the outstanding shares of the Fund. As of July 1, 1997, American Federation of
Musicians and Employers Pension Fund Amivest Discretionary investment Manager,
New York, New York 10005-2501 was the record owner of approximately 5.85% of the
outstanding shares of the Fund.
    

The Declaration of Trust provides that the Trust will indemnify its Trustees and
officers against liabilities and expenses incurred in connection with litigation
in which they may be involved because of their offices with the Trust, unless,
as to liabilities of the Trust or its shareholders, it is finally adjudicated
that they engaged in willful misfeasance, bad faith, gross negligence or
reckless disregard of the duties involved in their offices, or with respect to
any matter, unless it is adjudicated that they did not act in good faith in the
reasonable belief that their actions were in the best interest of the Trust. In
the case of settlement, such indemnification will not be provided unless it has
been determined pursuant to the Declaration of Trust, that such officers or
Trustees have not engaged in willful misfeasance, bad faith, gross negligence or
reckless disregard of their duties.

   
INVESTMENT ADVISER
MFS and its predecessor organizations have a history of money management dating
from 1924. MFS is a subsidiary of Sun Life of Canada (U.S.), which is an
indirect wholly owned subsidiary of Sun Life Assurance Company of Canada ("Sun
Life").
    

MFS manages the assets of the Fund pursuant to an Investment Advisory Agreement
with the Trust dated as of December 8, 1993 (the "Advisory Agreement"). Under
the Advisory Agreement, MFS provides the Fund with overall investment advisory
services. Subject to such policies as the Trustees may determine, MFS makes
investment decisions for the Fund. For these services and facilities, the
Adviser receives a management fee, computed and paid monthly, in an amount equal
to 0.65% per annum of the average daily net assets of the Fund.

For the period from the commencement of investment operations on January 14,
1994 to September 30, 1994 and for each of the fiscal years ended September 30,
1995 and 1996, MFS received advisory fees under the Advisory Agreement of
$64,457, $193,107 and $310,911, respectively.

MFS pays the compensation of the Trust's officers and of any Trustee who is an
officer of MFS. MFS also furnishes at its own expense all necessary
administrative services, including office space, equipment, clerical personnel,
investment advisory facilities, and all executive and supervisory personnel
necessary for managing the Fund's investments, effecting its portfolio
transactions and, in general, administering its affairs.

   
The Advisory Agreement with the Fund will remain in effect until August 1, 1998,
and will continue in effect thereafter only if such continuance is specifically
approved at least annually by the Board of Trustees or by vote of a majority of
the Fund's shares (as defined in "Investment Restrictions") and, in either case,
by a majority of the Trustees who are not parties to the Advisory Agreement or
interested persons of any such party. The Advisory Agreement terminates
automatically if it is assigned and may be terminated without penalty by vote of
a majority of the Fund's shares (as defined in "Investment Restrictions") or by
either party on not more than 60 days' nor less than 30 days' written notice.
The Advisory Agreement for the Fund provides that if MFS ceases to serve as the
investment adviser to the Fund, the Fund will change its name so as to delete
the term "MFS" and that MFS may render services to others and may permit other
fund clients to use the term "MFS" in their names. The Advisory Agreement also
provides that neither MFS nor its personnel shall be liable for any error of
judgment or mistake of law or for any loss arising out of any investment or for
any act or omission in the execution and management of the Fund, except for
willful misfeasance, bad faith or gross negligence in the performance of its or
their duties or by reason of reckless disregard of its or their obligations and
duties under the Advisory Agreement.
    

CUSTODIAN
State Street Bank and Trust Company (the "Custodian") is the custodian of the
Fund's assets. The Custodian's responsibilities include safekeeping and
controlling the Fund's cash and securities, handling the receipt and delivery of
securities, determining income and collecting interest on the Fund's
investments, maintaining books of original entry for portfolio and fund
accounting and other required books and accounts, and calculating the daily net
asset value of each class of shares of the Fund. The Custodian does not
determine the investment policies of the Fund or decide which securities the
Fund will buy or sell. The Fund may, however, invest in securities, including
repurchase agreements, issued by the Custodian and may deal with the Custodian
as principal in securities transactions. The Custodian also acts as the dividend
disbursing agent of the Fund. The Custodian has contracted with the Adviser for
the Adviser to perform certain accounting functions related to options
transactions for which the Adviser receives remuneration on a cost basis.

   
SHAREHOLDER SERVICING AGENT
MFS Service Center, Inc. (the "Shareholder Servicing Agent"), a wholly owned
subsidiary of MFS, is the Fund's shareholder servicing agent, pursuant to a
Shareholder Servicing Agreement, as amended, dated November 17, 1995 (the
"Agency Agreement") with the Fund. The Shareholder Servicing Agent's
responsibilities under the Agency Agreement include administering and performing
transfer agent functions and the keeping of records in connection with the
issuance, transfer and redemption of each class of shares of the Fund. For these
services, the Shareholder Servicing Agent will receive a fee calculated as a
percentage of the average daily net assets of the Fund at an effective annual
rate of 0.13% attributable to Class A, Class B and Class C shares, respectively.
In addition, the Shareholder Servicing Agent will be reimbursed by the Fund for
certain expenses incurred by the Shareholder Servicing Agent on behalf of the
Fund. State Street Bank and Trust Company, the dividend and distribution
disbursing agent of the Fund, has contracted with the Shareholder Servicing
Agent to administer and perform certain dividend and distribution disbursing
functions for the Fund.

DISTRIBUTOR
MFD, a wholly owned subsidiary of MFS, serves as distributor for the continuous
offering of shares of the Fund pursuant to a Distribution Agreement, dated July
30, 1997 (the "Distribution Agreement") with the Fund. Prior to January 1, 1995,
MFS Financial Services, Inc. ("FSI"), another wholly owned subsidiary of MFS,
was the Fund's distributor. Where this SAI refers to MFD in relation to the
receipt or payment of money with respect to a period or periods prior to January
1, 1995, such reference shall be deemed to include FSI, as the predecessor in
interest to MFD.

The Distribution Agreement will remain in effect until August 1, 1998 and will
continue in effect thereafter only if such continuance is specifically approved
at least annually by the Board of Trustees or by vote of a majority of the
Trust's shares (as defined in "Investment Restrictions") and in either case, by
a majority of the Trustees who are not parties to such Distribution Agreement or
interested persons of any such party. The Distribution Agreement terminates
automatically if it is assigned and may be terminated without penalty by either
party on not more than 60 days' nor less than 30 days' notice.
    

CLASS A SHARES: MFD acts as agent in selling Class A shares of the Fund to
dealers. The public offering price of Class A shares of the Fund is their net
asset value next computed after the sale plus a sales charge which varies based
upon the quantity purchased. The public offering price of Class A shares of the
Fund is calculated by dividing net asset value of a Class A share by the
difference (expressed as a decimal) between 100% and the sales charge percentage
of offering price applicable to the purchase (see "Purchases" in the
Prospectus). The sales charge scale set forth in the Prospectus applies to
purchases of Class A shares of the Fund alone or in combination with shares of
all classes of certain other funds in the MFS Family of Funds (the "MFS Funds")
and other Funds (as noted under Right of Accumulation) by any person, including
members of a family unit (e.g., husband, wife and minor children) and bona fide
trustees, and also applies to purchases made under the Right of Accumulation or
a Letter of Intent (see "Investment and Withdrawal Programs" below). A group
might qualify to obtain quantity sales charge discounts (see "Investment and
Withdrawal Programs" in this SAI).

Class A shares of the Fund may be sold at their net asset value to certain
persons or in certain instances as described in the Prospectus. Such sales are
made without a sales charge to promote good will with employees and others with
whom MFS, MFD and/or the Fund have business relationships, and because the sales
effort, if any, involved in making such sales is negligible.

   
MFD allows discounts to dealers (which are alike for all dealers) from the
applicable public offering price of the Class A shares. Dealer allowances
expressed as a percentage of offering price for all offering prices are set
forth in the Prospectus (see "Purchases" in the Prospectus). The difference
between the total amount invested and the sum of (a) the net proceeds to the
Fund and (b) the dealer commission, is the commission paid to the distributor.
Because of rounding in the computation of offering price, the portion of the
sales charge paid to the distributor may vary and the total sales charge may be
more or less than the sales charge calculated using the sales charge expressed
as a percentage of offering price or as a percentage of the net amount invested
as listed in the Prospectus. In the case of the maximum sales charge, the dealer
retains 5% and MFD retains approximately 3/4 of 1% of the public offering price.
In addition, MFD pays a commission to dealers who initiate and are responsible
for purchases of $1 million or more as described in the Prospectus.
    

CLASS B SHARES, CLASS C SHARES AND CLASS I SHARES: MFD acts as agent in selling
Class B shares, Class C shares and Class I shares to dealers. The public
offering price of Class B shares, Class C shares and Class I shares is their net
asset value next computed after the sale (see "Purchases" in the Prospectus and
the Prospectus Supplement to which Class I shares are offered).

GENERAL: On occasion, MFD may obtain brokers loans from various banks, including
the custodian banks for the MFS Funds, to facilitate the settlement of sales of
shares of the Fund to dealers. MFD may benefit from its temporary holding of
funds paid to it by investment dealers for the purchase of Fund shares. Neither
MFD nor dealers are permitted to delay placing orders to benefit themselves by a
price change.

   
The Distribution Agreement will remain in effect until August 1, 1998, and will
continue in effect thereafter only if such continuance is specifically approved
at least annually by the Board of Trustees or by vote of a majority of the
Fund's shares and, in either case, by a majority of the Trustees who are not
parties to the Distribution Agreement or interested persons of any such party.
The Distribution Agreement terminates automatically if it is assigned and may be
terminated without penalty by either party on not more than 60 days' nor less
than 30 days' notice.
    

5.  PORTFOLIO TRANSACTIONS AND BROKERAGE
    COMMISSIONS
Specific decisions to purchase or sell securities for the Fund are made by a
portfolio manager who is an employee of the Adviser and who is appointed and
supervised by its senior officers. Changes in the Fund's investments are
reviewed by the Board of Trustees. The Fund's portfolio manager may serve other
clients of the Adviser or any subsidiary of the Adviser in a similar capacity.

The primary consideration in placing portfolio security transactions with
broker-dealers for execution is to obtain and maintain the availability of
execution at the most favorable prices and in the most effective manner
possible. MFS has complete freedom as to the markets in and the broker-dealer
through which it seeks this result.

MFS attempts to achieve this result by selecting broker-dealers to execute
portfolio transactions on behalf of the Fund and other clients of MFS on the
basis of their professional capability, the value and quality of their brokerage
services, and the level of their brokerage commissions.

In the case of securities which are principally traded in the over-the-counter
market on a net basis through dealers acting for their own account and not as
brokers (where no stated commissions are paid but the prices include a dealer's
markup or markdown), MFS normally seeks to deal directly with the primary market
makers, unless in its opinion, better prices are available elsewhere. In the
case of securities purchased from underwriters, the cost of such securities
generally includes a fixed underwriting commission or concession. Securities
firms or futures commission merchants may receive brokerage commissions on
transactions involving options, Futures Contracts and Options on Futures
Contracts and the purchase and sale of underlying securities upon exercise of
options. The brokerage commissions associated with buying and selling options
may be proportionately higher than those associated with general securities
transactions.

From time to time, soliciting dealer fees-are available to MFS on the tender of
the Fund's portfolio securities in so-called tender or exchange offers. Such
soliciting dealer fees are in effect recaptured for the Fund by MFS. At present
no other recapture arrangements are in effect.

Under the Advisory Agreement and as permitted by Section 28(e) of the Securities
Exchange Act of 1934, MFS may cause the Fund to pay a broker-dealer which
provides brokerage and research services to MFS an amount of commission for
effecting a securities transaction for the Fund in excess of the amount other
broker-dealers would have charged for the transaction if MFS determines in good
faith that the greater commission is reasonable in relation to the value of the
brokerage and research services provided by the executing broker-dealer viewed
in terms of either a particular transaction or MFS's overall responsibilities to
the Fund or to its other clients. Not all of such services are useful or of
value in advising the Fund.

The term "brokerage and research services" includes advice as to the value of
securities, the advisability of purchasing or selling securities, and the
availability of purchasers or sellers of securities; furnishing analyses and
reports concerning issues, industries, securities, economic factors and trends,
portfolio strategy and the performance of accounts; and effecting securities
transactions and performing functions incidental thereto such as clearance and
settlement.

Although commissions paid on every transaction will, in the judgment of MFS, be
reasonable in relation to the value of the brokerage services provided,
commissions exceeding those which another broker might charge may be paid to
broker-dealers who were selected to execute transactions on behalf of the Fund
and MFS's other clients in part for providing advice as to the availability of
purchasers or sellers of securities and services in effecting securities
transactions and performing functions incidental thereto such as clearance and
settlement.

Broker-dealers may be willing to furnish statistical, research and other factual
information or services ("Research") to MFS for no consideration other than
brokerage or underwriting commissions. Securities may be bought or sold from
time to time through such broker-dealers on behalf of the Fund. The Trustees
(together with the Trustees of the other MFS Funds) have directed MFS to
allocate a total of $39,100 of commission business from the various MFS Funds to
the Pershing Division of Donaldson, Lufkin & Jenrette as consideration for the
annual renewal of the certain publications provided by Lipper Analytical
Securities Corporation (which provides information useful to the Trustees in
reviewing the relationship between the Fund and MFS).

The investment management personnel of MFS attempt to evaluate the quality of
Research provided by brokers. Results of this effort are sometimes used by MFS
as a consideration in the selection of brokers to execute portfolio
transactions. However, MFS is unable to quantify the amount of commissions which
will be paid as a result of such Research because a substantial number of
transactions will be effected through brokers which provide Research but which
were selected principally because of their execution capabilities.

The management fee that the Fund pays to MFS will not be reduced as a
consequence of the receipt of brokerage and research services by MFS. To the
extent the Fund's portfolio transactions are used to obtain such services, the
brokerage commissions paid by the Fund will exceed those that might otherwise be
paid, by an amount which cannot be presently determined. Such services would be
useful and of value to MFS in serving both the Fund and other clients and,
conversely, such services obtained by the placement of brokerage business of
other clients would be useful to MFS in carrying out its obligations to the
Fund. While such services are not expected to reduce the expenses of MFS, MFS
would, through use of the services, avoid the additional expenses which would be
incurred if it should attempt to develop comparable information through its own
staff.

Consistent with the foregoing primary consideration, the Conduct Rules of the
National Association of Securities Dealers, Inc. (the "NASD") and such other
policies as the Trustees may determine, the Adviser may consider sales of shares
of the Fund and of the other investment company clients of MFD as a factor in
the selection of broker-dealers to execute the Fund's portfolio transactions.

In certain instances there may be securities which are suitable for the Fund's
portfolio as well as for that of one or more of the other clients of the Adviser
or any subsidiary of the Adviser. Investment decisions for the Fund and for such
other clients are made with a view to achieving their respective investment
objectives. It may develop that a particular security is bought or sold for only
one client even though it might be held by, or bought or sold for, other
clients. Likewise, a particular security may be bought for one or more clients
when one or more other clients are selling that same security. Some simultaneous
transactions are inevitable when several clients receive investment advice from
the same investment adviser, particularly when the same security is suitable for
the investment objectives of more than one client. When two or more clients are
simultaneously engaged in the purchase or sale of the same security, the
securities are allocated among clients in a manner believed by the Adviser to be
equitable to each. It is recognized that in some cases this system could have a
detrimental effect on the price or volume of the security as far as the Fund is
concerned. In some cases, however, the Fund believes that its ability to
participate in volume transactions will produce better executions for the Fund.

For each of the fiscal years ended September 30, 1996 and 1995, the Fund paid
total brokerage commissions of $78,481 and $115,591, respectively on total
transactions of $61,985,397 and $73,027,727, respectively. For the period from
commencement of investment operations on January 14, 1994 to September 30, 1994,
the Fund paid total brokerage commissions of $39,724 on total transactions of
$34,413,987.

6.  SHAREHOLDER SERVICES

INVESTMENT AND WITHDRAWAL PROGRAMS -- The Fund makes available the following
programs designed to enable shareholders to add to their investment or withdraw
from it with a minimum of paper work. These are described below and in certain
cases, in the Prospectus. The programs involve no extra charge to shareholders
(other than a sales charge in the case of certain Class A share purchases) and
may be changed or discontinued at any time by a shareholder or the Fund.

  LETTER OF INTENT: If a shareholder (other than a group purchaser described
below) anticipates purchasing $50,000 or more of Class A shares of the Fund
alone or in combination with shares of Class B or Class C of the Fund or any of
the classes of other MFS Funds or MFS Fixed Fund (a bank collective investment
fund) within a 13-month period (or 36-month period, in the case of purchases of
$1 million or more), the shareholder may obtain Class A shares of the Fund at
the same reduced sales charge as though the total quantity were invested in one
lump sum by completing the Letter of Intent section of the Account Application
or filing a separate Letter of Intent application (available from the
Shareholder Servicing Agent) within 90 days of the commencement of purchases.
Subject to acceptance by MFD and the conditions mentioned below, each purchase
will be made at a public offering price applicable to a single transaction of
the dollar amount specified in the Letter of Intent application. The shareholder
or his dealer must inform MFD that the Letter of Intent is in effect each time
shares are purchased. The shareholder makes no commitment to purchase additional
shares, but if his purchases within 13 months (or 36 months in the case of
purchases of $1 million or more) plus the value of shares credited toward
completion of the Letter of Intent do not total the sum specified, he will pay
the increased amount of the sales charge as described below. Instructions for
issuance of shares in the name of a person other than the person signing the
Letter of Intent application must be accompanied by a written statement from the
dealer stating that the shares were paid for by the person signing such Letter.
Neither income dividends nor capital gain distributions taken in additional
shares will apply toward the completion of the Letter of Intent. Dividends and
distributions of other MFS Funds automatically reinvested in shares of the Fund
pursuant to the Distribution Investment Program also will not apply toward
completion of the Letter of Intent.

Out of the shareholder's initial purchase (or subsequent purchases if
necessary), 5% of the dollar amount specified in the Letter of Intent
application shall be held in escrow by the Shareholder Servicing Agent in the
form of shares registered in the shareholder's name. All income dividends and
capital gain distributions on escrowed shares will be paid to the shareholder or
to his order. When the minimum investment so specified is completed (either
prior to or by the end of the 13-month period or 36-month period, as
applicable), the shareholder will be notified and the escrowed shares will be
released.

If the intended investment is not completed, the Shareholder Servicing Agent
will redeem an appropriate number of the escrowed shares in order to realize
such difference. Shares remaining after any such redemption will be released by
the Shareholder Servicing Agent. By completing and signing the Account
Application or separate Letter of Intent application, the shareholder
irrevocably appoints the Shareholder Servicing Agent his attorney to surrender
for redemption any or all escrowed shares with full power of substitution in the
premises.

   
  RIGHT OF ACCUMULATION: A shareholder qualifies for cumulative quantity
discounts on the purchase of Class A shares when that shareholder's new
investment, together with the current offering price value of all holdings of
Class A, Class B and Class C shares of that shareholder in the MFS Funds or the
MFS Fixed Fund (a bank collective investment fund) reaches a discount level. See
"Purchases" in the Prospectus for the sales charges on quantity discounts. For
example, if a shareholder owns shares with a current offering price value of
$25,000 and purchases an additional $25,000 of Class A shares of the Fund, the
sales charge for the $25,000 purchase would be at the rate of 4.75% (the rate
applicable to single transactions of $50,000). A shareholder must provide the
Shareholder Servicing Agent (or his investment dealer must provide MFD) with
information to verify that the quantity sales charge discount is applicable at
the time the investment is made.

SUBSEQUENT INVESTMENT BY TELEPHONE: Each shareholder may purchase additional
shares of any MFS Fund by telephoning the Shareholder Servicing Agent toll-free
at (800) 225-2606. The minimum purchase amount is $50 and the maximum purchase
amount is $100,000. Shareholders wishing to avail themselves of this telephone
purchase privilege must so elect on their Account Application and designate
thereon a bank and account number from which purchases will be made. If a
telephone purchase request is received by the Shareholder Servicing Agent on any
business day prior to the close of regular trading on the Exchange (generally,
4:00 p.m., Eastern time), the purchase will occur at the closing net asset value
of the shares purchased on that day. The Shareholder Servicing Agent may be
liable for any losses resulting from unauthorized telephone transactions if it
does not follow reasonable procedures designed to verify the identity of the
caller. The Shareholder Servicing Agent will request personal or other
information from the caller, and will normally also record calls. Shareholders
should verify the accuracy of confirmation statements immediately after their
receipt.
    

  DISTRIBUTION INVESTMENT PROGRAM: Distributions of dividends and capital gains
made by the Fund with respect to a particular class of shares may be
automatically invested in shares of the same class of one of the other MFS Funds
if shares of the fund are available for sale. Such investments will be subject
to additional purchase minimums. Distributions will be invested at net asset
value (exclusive of any sales charge) and will not be subject to a CDSC.
Distributions will be invested at the close of business on the payable date for
the distribution. A shareholder considering the Distribution Investment Program
should obtain and read the prospectus of the other fund and consider the
differences in objectives and policies before making any investment.

  SYSTEMATIC WITHDRAWAL PLAN: A shareholder may direct the Shareholder Servicing
Agent to send him (or anyone he designates) regular periodic payments based upon
the value of his account. Each payment under a Systematic Withdrawal Plan
("SWP") must be at least $100, except in certain limited circumstances. The
aggregate withdrawals of Class B shares in any year pursuant to a SWP generally
are limited to 10% of the value of the account at the time of the establishment
of the SWP. SWP payments are drawn from the proceeds of share redemptions held
in the shareholder's account (which would be a return of principal and, if
reflecting a gain, would be taxable). Redemptions of Class B and Class C shares
will be made in the following order: (i) to the extent necessary, any "Free
Amount"; (ii) any "Reinvested Shares" and (iii) to the extent necessary, the
"Direct Purchase" subject to the lowest CDSC (as such terms are defined in
"Contingent Deferred Sales Charge" in the Prospectus). The CDSC will be waived
in the case of redemptions of Class B and Class C shares pursuant to a SWP, but
will not be waived in the case of SWP redemptions of Class A shares which are
subject to a CDSC. To the extent that redemptions for such periodic withdrawals
exceed dividend income reinvested in the account, such redemptions will reduce
and may eventually exhaust the number of shares in the shareholder's account.
All dividend and capital gain distributions for an account with a SWP will be
reinvested in additional full and fractional shares of the Fund at the net asset
value in effect at the close of business on the record date for such
distributions. To initiate this service, shares having an aggregate value of at
least $5,000 either must be held on deposit by, or certificates for such shares
must be deposited with, the Shareholder Servicing Agent. With respect to Class A
shares, maintaining a withdrawal plan concurrently with an investment program
would be disadvantageous because of the sales charges included in share
purchases and the imposition of a CDSC on certain redemptions. The shareholder
may deposit into the account additional shares of the Fund, change the payee or
change the dollar amount of each payment. The Shareholder Servicing Agent may
charge the account for services rendered and expenses incurred beyond those
normally assumed by the Fund with respect to the liquidation of shares. No
charge is currently assessed against the account, but one could be instituted by
the Shareholder Servicing Agent on 60 days' notice in writing to the shareholder
in the event that the Fund ceases to assume the cost of these services. The Fund
may terminate any SWP for an account if the value of the account falls below
$5,000 as a result of share redemptions (other than as a result of a SWP) or an
exchange of shares of the Fund for shares of another MFS Fund. Any SWP may be
terminated at any time by either the shareholder or the Fund.

  INVEST BY MAIL: Additional investments of $50 or more may be made at any time
by mailing a check payable to the Fund directly to the Shareholder Servicing
Agent. The shareholder's account number and the name of his investment dealer
must be included with each investment.

  GROUP PURCHASES: A bona fide group and all its members may be treated as a
single purchaser and, under the Right of Accumulation (but not a Letter of
Intent), obtain quantity sales charge discounts on the purchase of Class A
shares if the group (1) gives its endorsement or authorization to the investment
program so it may be used by the investment dealer to facilitate solicitation of
the membership, thus effecting economies of sales effort; (2) has been in
existence for at least six months and has a legitimate purpose other than to
purchase mutual fund shares at a discount; (3) is not a group of individuals
whose sole organizational nexus is as credit cardholders of a company,
policyholders of an insurance company, customers of a bank or broker-dealer,
clients of an investment adviser or other similar group; and (4) agrees to
provide certification of membership of those members investing money in the MFS
Funds upon the request of MFD.

  AUTOMATIC EXCHANGE PLAN: Shareholders having account balances of at least
$5,000 in any MFS Fund may exchange their shares for the same class of shares of
the other MFS Funds (if available for sale) under the Automatic Exchange Plan.
The Automatic Exchange Plan provides for automatic exchanges of funds from the
shareholder's account in an MFS Fund for investment in the same class of shares
of other MFS Funds selected by the shareholder. Under the Automatic Exchange
Plan, exchanges of at least $50 each may be made to up to six different funds
effective on the seventh day of each month or of every third month, depending
whether monthly or quarterly exchanges are elected by the shareholder. If the
seventh day of the month is not a business day, the transaction will be
processed on the next business day. Generally, the initial exchange will occur
after receipt and processing by the Shareholder Servicing Agent of an
application in good order. Exchanges will continue to be made from a
shareholder's account in any MFS Fund as long as the balance of the account is
sufficient to complete the exchanges. Additional payments made to a
shareholder's account will extend the period that exchanges will continue to be
made under the Automatic Exchange Plan. However, if additional payments are
added to an account subject to the Automatic Exchange Plan shortly before an
exchange is scheduled, such funds may not be available for exchanges until the
following month; therefore, care should be used to avoid inadvertently
terminating the Automatic Exchange Plan through exhaustion of the account
balance.

No transaction fee will be charged for exchanges in connection with the
Automatic Exchange Plan. However, exchanges of shares of MFS Money Market Fund,
MFS Government Money Market Fund and Class A shares of MFS Cash Reserve Fund
will be subject to any applicable sales charge. Changes in amounts to be
exchanged to each fund, the funds to which exchanges are to be made and the
timing of exchanges (monthly or quarterly), or termination of a shareholder's
participation in the Automatic Exchange Plan will be made after instructions in
writing or by telephone (an "Exchange Change Request") are received by the
Shareholder Servicing Agent in proper form (i.e., if in writing -- signed by the
record owner(s) exactly as shares are registered; if by telephone -- proper
account identification is given by the dealer or shareholder of record). Each
Exchange Change Request (other than termination of participation in the program)
must involve at least $50. Generally, if an Exchange Change Request is received
by telephone or in writing before the close of business on the last business day
of a month, the Exchange Change Request will be effective for the following
month's exchange.

A shareholder's right to make additional investments in any of the MFS Funds, to
make exchanges of shares from one MFS Fund to another and to withdraw from an
MFS Fund, as well as a shareholder's other rights and privileges, are not
affected by a shareholder's participation in the Automatic Exchange Plan.

The Automatic Exchange Plan is part of the Exchange Privilege. For additional
information regarding the Automatic Exchange Plan, including the treatment of
any CDSC, see "Exchange Privilege" below.

  REINSTATEMENT PRIVILEGE: Shareholders of the Fund and shareholders of the
other MFS Funds (except MFS Money Market Fund, MFS Government Money Market Fund
and Class A shares of MFS Cash Reserve Fund in the case where the shares are
acquired through direct purchase or reinvested dividends) who have redeemed
their shares have a one-time right to reinvest the redemption proceeds in the
same class of shares of any of the MFS Funds (if shares of the fund are
available for sale) at net asset value (without a sales charge) and, if
applicable, with credit for any CDSC paid. In the case of proceeds reinvested in
shares of MFS Money Market Fund, MFS Government Money Market Fund or Class A
shares of MFS Cash Reserve Fund, the shareholder has the right to exchange the
acquired shares for shares of another MFS Fund at net asset value pursuant to
the exchange privilege described below. Such a reinvestment must be made within
90 days of the redemption and is limited to the amount of the redemption
proceeds. If the shares credited for any CDSC paid are then redeemed within six
years of their initial purchase in the case of Class B shares or within 12
months of the initial purchase of Class C shares and certain Class A shares, a
CDSC will be imposed upon redemption. Although redemptions and repurchases of
shares are taxable events, a reinvestment within a certain period of time in the
same fund may be considered a "wash sale" and may result in the inability to
recognize currently all or a portion of a loss realized on the original
redemption for federal income tax purposes.
Please see your tax adviser for further information.

EXCHANGE PRIVILEGE -- Subject to the requirements set forth below, some or all
of the shares in an account with the Fund for which payment has been received by
the Fund (i.e., an established account) may be exchanged for shares of the same
class of any of the other MFS Funds (if available for sale and if the purchaser
is eligible to purchase the Class of shares) at their net asset value. Exchanges
will be made only after instructions in writing or by telephone (an "Exchange
Request") are received for an established account by the Shareholder Servicing
Agent.

Each Exchange Request must be in proper form (i.e., if in writing -- signed by
the record owner(s) exactly as the shares are registered; if by telephone --
proper account identification is given by the dealer or shareholder of record),
and each exchange must involve either shares having an aggregate value of at
least $1,000 ($50 in the case of retirement plan participants whose sponsoring
organizations subscribe to the MFS FUNDamental 401(k) Plan or another similar
401(k) recordkeeping system made available by the Shareholder Servicing Agent)
or all the shares in the account. Each exchange involves the redemption of the
shares of the Fund to be exchanged and the purchase at net asset value (i.e.,
without a sales charge) of shares of the same class of the other MFS Fund. Any
gain or loss on the redemption of the shares exchanged is reportable on the
shareholder's federal income tax return, unless both the shares received and the
shares surrendered in the exchange are held in a tax-deferred retirement plan or
other tax-exempt account. If the Exchange Request is received by the Shareholder
Servicing Agent prior to the close of regular trading on the Exchange on any
business day, the exchange usually will occur on that day if all the
requirements set forth above have been complied with at that time. However,
payment of the redemption proceeds by the Fund, and thus the purchase of shares
of the other MFS Fund, may be delayed for up to seven days if the Fund
determines that such a delay would be in the best interest of all its
shareholders. No more than five exchanges may be made in any one Exchange
Request by telephone. Investment dealers which have satisfied criteria
established by MFD may also communicate a shareholder's Exchange Request to MFD
by facsimile subject to the requirements set forth above.

No CDSC is imposed on exchanges among the MFS Funds, although liability for the
CDSC is carried forward to the exchanged shares. For purposes of calculating the
CDSC upon redemption of shares acquired in an exchange, the purchase of shares
acquired in one or more exchanges is deemed to have occurred at the time of the
original purchase of the exchanged shares.

Additional information with respect to any of the MFS Funds, including a copy of
its current prospectus, may be obtained from investment dealers or the
Shareholder Servicing Agent. A shareholder considering an exchange should obtain
and read the prospectus of the other MFS Fund and consider the differences in
objectives and policies before making any exchange. Shareholders of the other
MFS Funds (except shares of MFS Money Market Fund, MFS Government Money Market
Fund and Class A shares of MFS Cash Reserve Fund acquired through direct
purchase and dividends reinvested prior to June 1, 1992) have the right to
exchange their shares for shares of the MFS Funds, subject to the conditions, if
any, set forth in their respective prospectuses. In addition, unitholders of the
MFS Fixed Fund have the right to exchange their units (except units acquired
through direct purchases) for shares of the Fund, subject to the conditions, if
any, imposed upon such unitholders by the MFS Fixed Fund.

Any state income tax advantages for investment in shares of each state- specific
series of MFS Municipal Series Trust may only benefit residents of such states.
Investors should consult with their own tax advisers to be sure this is an
appropriate investment, based on their residency and each state's income tax
laws.

The exchange privilege (or any aspect of it) may be changed or discontinued and
is subject to certain limitations (see "Purchases" in the Prospectus).

TAX-DEFERRED RETIREMENT PLANS -- Shares of the Fund may be purchased by certain
types of tax-deferred retirement plans. MFD makes available through investment
dealers plans and/or custody agreements for the following:

  Individual Retirement Accounts (IRAs) (for individuals and their non- employed
  spouses who desire to make limited contributions to a tax-deferred retirement
  program and, if eligible, to receive a federal income tax deduction for
  amounts contributed);

  Simplified Employee Pension (SEP-IRA) Plans;

  Retirement Plans Qualified under Section 401(k) of the Internal Revenue Code
  of 1986, as amended (the "Code");

  403(b) Plans (deferred compensation arrangements for employees of public
  school systems and certain non-profit organizations); and

  Certain other qualified pension and profit-sharing plans.

The plan documents provided by MFD designate a trustee or custodian (unless
another trustee or custodian is designated by the individual or group
establishing the plan) and contain specific information about the plans. Each
plan provides that dividends and distributions will be reinvested automatically.
For further details with respect to any plan, including fees charged by the
trustee, custodian or MFD, tax consequences and redemption information, see the
specific documents for that plan. Plan documents other than those provided by
MFD may be used to establish any of the plans described above. Third party
administrative services, available for some corporate plans, may limit or delay
the processing of transactions.

Investors should consult with their tax advisers before establishing any of the
tax-deferred retirement plans described above.

Class C shares are not currently available for purchase by any retirement plan
qualified under Internal Revenue Code section 401(a) or 403(b) if the retirement
plan and/or the sponsoring organization subscribe to the MFS FUNDamental 401(k)
Plan or another similar 401(a) or 403(b) recordkeeping program made available by
the Shareholder Servicing Agent.

7.  TAX STATUS

The Fund has elected to be treated and intends to qualify each year as a
"regulated investment company" under Subchapter M of the Internal Revenue Code
of 1986, as amended (the "Code"), by meeting all applicable requirements of
Subchapter M, including requirements as to the nature of the Fund's gross
income, the amount of Fund distributions, and the composition and holding period
of the Fund's portfolio assets. Because the Fund intends to distribute all of
its net investment income and net realized capital gains to shareholders in
accordance with the timing and requirements imposed by the Code, it is not
expected that the Fund will be required to pay any federal income or excise
taxes. If the Fund should fail to qualify as a "regulated investment company" in
any year, the Fund would incur regular corporate federal income tax upon its
taxable income and Fund distributions would generally be taxable as ordinary
dividend income to non-exempt shareholders.

Tax-exempt shareholders generally will not pay taxes on Fund distributions.
Shareholders of the Fund that are not tax-exempt entities will have to pay
federal income taxes and any state or local taxes on the dividends and capital
gain distributions they receive from the Fund. Dividends from ordinary income
and any distributions from net short-term capital gains are taxable to non
tax-exempt shareholders as ordinary income for federal income tax purposes,
whether the distributions are paid in cash or reinvested in additional shares. A
portion of the Fund's ordinary income dividends (but none of its capital gains)
is normally eligible for the dividends-received deduction for corporations if
the recipient otherwise qualifies for that deduction with respect to its holding
of the Fund's shares. Availability of the deduction to particular corporate
shareholders is subject to certain limitations and deducted amounts may be
subject to the alternative minimum tax or result in certain basis adjustments.
Distributions of net capital gains (i.e., the excess of net long-term capital
gains over net short-term capital losses), whether paid in cash or in reinvested
additional shares, are taxable to non-exempt shareholders as long-term capital
gains without regard to the length of time the shareholders have held their
shares. Any Fund dividend that is declared in October, November, or December of
any calendar year, that is payable to shareholders of record in such a month,
and that is paid the following January will be treated as if received by the
shareholders on December 31 of the year in which the dividend is declared. The
Fund will notify non-tax-exempt shareholders regarding the federal tax status of
its distributions after the end of each calendar year.

Any Fund distribution will have the effect of reducing the per share net asset
value of shares in the Fund by the amount of the distribution. Non-tax-exempt
shareholders purchasing shares shortly before the record date of any
distribution may thus pay the full price for the shares and then effectively
receive a portion of the purchase price back as a taxable distribution.

In general, any gain or loss realized upon a taxable disposition of shares of
the Fund by a shareholder that holds such shares as a capital asset will be
treated as a long-term capital gain or loss if the shares have been held for
more than twelve months and otherwise as a short-term capital gain or loss.
However, any loss realized upon a disposition of shares in the Fund held for six
months or less will be treated as a long-term capital loss to the extent of any
distributions of net capital gain made with respect to those shares. Any loss
realized upon a disposition of shares may also be disallowed under rules
relating to wash sales. Gain may be increased (or loss reduced) upon a
redemption of Class A shares of the Fund within 90 days after their purchase
followed by any purchase (including purchases by exchange or by reinvestment)
without payment of an additional sales charge of Class A shares of the Fund or
of another MFS Fund (or any other shares of an MFS Fund generally sold subject
to a sales charge).

The Fund's current dividend and accounting policies will affect the amount,
timing, and character of distributions to shareholders, and may, under certain
circumstances, make an economic return of capital taxable to shareholders.

Any investment in zero coupon bonds and certain securities purchased at a market
discount will cause the Fund to recognize income prior to the receipt of cash
payments with respect to those securities. In order to distribute this income
and avoid a tax on the Fund, the Fund may be required to liquidate portfolio
securities that it might otherwise have continued to hold, potentially resulting
in additional taxable gain or loss to the Fund.

The Fund's transactions in options and Futures Contracts will be subject to
special tax rules that may affect the amount, timing and character of Fund
income and distributions to shareholders. For example, certain positions held by
the Fund on the last business day of each taxable year will be marked to market
(i.e., treated as if closed out) on that day, and any gain or loss associated
with the positions will be treated as 60% long-term and 40% short-term capital
gain or loss. Certain positions held by the Fund that substantially diminish its
risk of loss with respect to other positions in its portfolio may constitute
"straddles," and may be subject to special tax rules that could cause deferral
of Fund losses, adjustments in the holding periods of Fund securities and
conversion of short-term into long-term capital losses. Certain tax elections
exist for straddles that may alter the effects of these rules. The Fund will
limit its activities in options and Futures Contracts to the extent necessary to
meet the requirements of Subchapter M of the Code.

Dividends and certain other payments to persons who are not citizens or
residents of the United States or U.S. entities ("Non-U.S. Persons") are
generally subject to U.S. tax withholding at the rate of 30%. The Fund intends
to withhold U.S. federal income tax at the rate of 30% on any taxable dividends
or other payments made to Non-U.S. Persons that are subject to such withholding,
regardless of whether a lower rate may be permitted under an applicable treaty.
Any amounts overwithheld may be recovered by such persons by filing a claim for
refund with the U.S. Internal Revenue Service within the time period appropriate
to such claims. Distributions received from the Fund by Non-U.S. Persons also
may be subject to tax under the laws of their jurisdiction. The Fund is also
required in certain circumstances to apply backup withholding at the rate of 31%
on taxable dividends and redemption proceeds paid to any shareholder (including
a Non-U.S. Person) who does not furnish to the Fund certain information and
certifications or who is otherwise subject to backup withholding. Backup
withholding will not, however, be applied to payments which have been subject to
30% withholding.

As long as the Fund qualifies for treatment as a regulated investment company
under the Code, it will not be subject to any Massachusetts excise or income
taxes.

8.  DETERMINATION OF NET ASSET VALUE AND PERFORMANCE

NET ASSET VALUE: The net asset value per share of each class of the Fund is
determined each day during which the Exchange is open for trading. (As of the
date of this SAI, such Exchange is open for trading every weekday except for the
following holidays or the days on which they are observed: New Year's Day,
Martin Luther King Day, Presidents' Day, Good Friday, Memorial Day, Independence
Day, Labor Day, Thanksgiving Day and Christmas Day.) This determination is made
once during each such day as of the close of regular trading on such Exchange by
deducting the amount of the liabilities attributable to the class from the value
of the assets attributable to the class and dividing the difference by the
number of shares of the class outstanding. Securities, Futures Contracts and
options in the Fund's portfolio (other than short-term obligations) for which
the principal market is one or more securities or commodities exchanges will be
valued at the last reported sale price or at the settlement price prior to the
determination (or if there has been no current sale, at the closing bid price)
on the primary exchange on which such securities, Futures Contracts or options
are traded; but if a securities exchange is not the principal market for
securities, such securities will, if market quotations are readily available, be
valued at current bid prices, unless such securities are reported on the NASDAQ
system, in which case they are valued at the last sale price or, if no sales
occurred during the day, at the last quoted bid price. Debt securities (other
than short-term obligations but including listed securities) in the Fund's
portfolio are valued on the basis of valuations furnished by a pricing service
which utilizes both dealer-supplied valuations and electronic data processing
techniques which take into account appropriate factors such as institutional-
size trading in similar groups of securities, yield, quality, coupon rate,
maturity, type of issue, trading characteristics and other market data, without
exclusive reliance upon exchange or over-the-counter prices, since such
valuations are believed to reflect more accurately the fair value of such
securities. Short-term obligations, if any, in the Fund's portfolio are valued
at amortized cost, which constitutes fair value as determined by the Board of
Trustees. Short-term obligations with a remaining maturity in excess of 60 days
will be valued based upon dealer supplied valuations. Portfolio securities and
over-the-counter options, for which there are no such quotations or valuations
are valued at fair value as determined in good faith by or at the direction of
the Board of Trustees. A share's net asset value is effective for orders
received by the dealer prior to its calculation and received by MFD prior to the
close of that business day.

PERFORMANCE INFORMATION
TOTAL RATE OF RETURN: The Fund will calculate its total rate of return for each
class of shares for certain periods by determining the average annual compounded
rates of return over those periods that would cause an investment of $1,000
(made with all distributions reinvested and reflecting the CDSC or the maximum
public offering price) to reach the value of that investment at the end of the
periods. The Fund may also calculate (i) a total rate of return, which is not
reduced by the CDSC (4% maximum for Class B shares and 1% maximum for Class C
shares) and therefore may result in a higher rate of return, (ii) a total rate
of return assuming an initial account value of $1,000, which will result in a
higher rate of return since the value of the initial account will not be reduced
by the sales charge applicable to Class A shares (5.75% maximum), and/or (iii)
total rates of return which represent aggregate performance over a period or
year-by-year performance, and which may or may not reflect the effect of the
maximum or other sales charge or CDSC.

The Fund offers multiple classes of shares which were initially offered for sale
to the public on different dates. The calculation of total rate of return for a
class of shares which initially was offered for sale to the public subsequent to
another class of shares of the Fund is based both on (i) the performance of the
Fund's newer class from the date it initially was offered for sale to the public
and (ii) the performance of the Fund's oldest class from the date it initially
was offered for sale to the public up to the date that the newer class initially
was offered for sale to the public.

   
As discussed in the Prospectus, the sales charges, expenses and expense ratios,
and therefore the performance, of the Fund's classes of shares differ. In
calculating total rate of return for a newer class of shares in accordance with
certain formulas required by the SEC, the performance will be adjusted to take
into account the fact that the newer class is subject to a different sales
charge than the oldest class (e.g., if the newer class is Class A shares, the
total rate of return quoted will reflect the deduction of the initial sales
charge applicable to Class A shares; if the newer class is Class B shares, the
total rate of return quoted will reflect the deduction of the CDSC applicable to
Class B shares). However, the performance will not be adjusted to take into
account the fact that the newer class of shares bears different class specific
expenses than the oldest shares (e.g., Rule 12b-1 fees). Therefore, the total
rate of return quoted for a newer class of shares will differ from the return
that would be quoted had the newer class of shares been outstanding for the
entire period over which the calculation is based (i.e., the total rate of
return quoted for the newer class will be higher than the return that would have
been quoted had the newer class of shares been outstanding for the entire period
over which the calculation is based if the class specific expenses for the newer
class are higher than the class specific expenses of the oldest class, and the
total rate of return quoted for the newer class will be lower than the return
that would be quoted had the newer class of shares been outstanding for this
entire period if the class specific expenses for the newer class are lower than
the class specific expenses of the oldest class). The average annual total rate
of return for Class I shares for the one-year period ended March 31, 1997 and
for the period from January 14, 1994 (commencement of investment operations) to
March 31, 1997 was 16.04% and 15.64%, respectively. Class A, Class B and Class C
shares were not offered for sale prior to the date of this SAI. The average
annual total rate of return for the LSI for the one-year period ended March 31,
1997 and for the period from January 14, 1994 to March 31, 1997 was 16.50% and
16.90%, respectively.
    

GENERAL: From time to time, the Fund may quote, and compare its performance to,
the LSI. In addition, from time to time, the Fund may, as appropriate, quote
Fund rankings or reprint all or a portion of evaluations of Fund performance and
operations appearing in various independent publications, including but not
limited to the following: Money, Fortune, U.S. News and World Report,
Kiplinger's Personal Finance, The Wall Street Journal, Barron's, Investors
Business Daily, Newsweek, Financial World, Financial Planning, Investment
Advisor, USA Today, Pensions and Investments, SmartMoney, Forbes, Global
Finance, Registered Representative, Institutional Investor, the Investment
Company Institute, Johnson's Charts, Morningstar, Lipper Analytical Services,
Inc., CDA Wiesenberger, Shearson Lehman and Salomon Bros. Indices, Ibbotson,
Business Week, Lowry Associates, Media General, Investment Company Data, The New
York Times, Your Money, Strangers Investment Advisor, Financial Planning on Wall
Street, Standard and Poor's, Individual Investor, The 100 Best Mutual Funds You
Can Buy by Gordon K. Williamson, Consumer Price Index, and Sanford C. Bernstein
& Co. Fund performance may also be compared to the performance of other mutual
funds tracked by financial or business publications or periodicals.

The Fund may also quote evaluations mentioned in independent radio or television
broadcasts.

From time to time, the Fund may use charts and graphs to illustrate the past
performance of various indices such as those mentioned above and illustrations
using hypothetical rates of return to illustrate the effects of compounding and
tax-deferral.

The Fund may advertise examples of the effects of periodic investment plans,
including the principle of dollar cost averaging. In such a program, an investor
invests a fixed dollar amount in a fund at periodic intervals, thereby
purchasing fewer shares when prices are high and more shares when prices are
low. While such a strategy does not assure a profit or guard against a loss in a
declining market, the investor's average cost per share can be lower than if
fixed numbers of shares are purchased at the same intervals.

From time to time, the Fund may discuss or quote its current portfolio manager
as well as other investment personnel, including such persons' views on: the
economy; securities markets; portfolio securities and their issuers; investment
philosophies, strategies, techniques and criteria used in the selection of
securities to be purchased or sold for the Fund; the Fund's portfolio holdings;
the investment research and analysis process; the formulation and evaluation of
investment recommendations; and the assessment and evaluation of credit,
interest rate, market and economic risks. and other similar or related matters.

From time to time the Fund may also discuss or quote the views of its
distributor, its investment adviser and other financial planning, legal, tax,
accounting, insurance, estate planning and other professionals, or from surveys,
regarding individual and family financial planning. Such views may include
information regarding the following: retirement planning; tax management
strategies; estate planning; general investment techniques (e.g., asset
allocation and disciplined saving and investing); business succession; ideas and
information provided through the MFS Heritage Planningsm program, an
inter-generational financial planning assistance program; issues with respect to
insurance (e.g., disability and life insurance and Medicare supplemental
insurance); issues regarding financial and health care management for elderly
family members; and other similar or related matters.

MFS FIRSTS: MFS has a long history of innovations.

     --    1924 -- Massachusetts Investors Trust is established as the first
           open-end mutual fund in America.

     --    1924 -- Massachusetts Investors Trust is the first mutual fund to
           make full public disclosure of its operations in shareholder reports.

     --    1932 -- One of the first internal research departments is established
           to provide in-house analytical capability for an investment
           management firm.

     --    1933 -- Massachusetts Investors Trust is the first mutual fund to
           register under the Securities Act of 1933 ("Truth in Securities Act"
           or "Full Disclosure Act").

     --    1936 -- Massachusetts Investors Trust is the first mutual fund to
           allow shareholders to take capital gain distributions either in
           additional shares or cash.

     --    1976 -- MFS(R) Municipal Bond Fund is among the first municipal bond
           funds established.

     --    1979 -- Spectrum becomes the first combination fixed/ variable
           annuity with no initial sales charge.

     --    1981 -- MFS(R) World Governments Fund is established as America's
           first globally diversified fixed-income mutual fund.

     --    1984 -- MFS(R) Municipal High Income Fund is the first open-end
           mutual fund to seek high tax-free income from lower-rated municipal
           securities.

     --    1986 -- MFS(R) Managed Sectors Fund becomes the first mutual fund to
           target and shift investments among industry sectors for shareholders.

     --    1986 -- MFS(R) Municipal Income Trust is the first closed-end,
           high-yield municipal bond fund traded on the New York Stock Exchange.

     --    1987 -- MFS(R) Multimarket Income Trust is the first closed-end,
           multimarket high income fund listed on the New York Stock Exchange.

     --    1989 -- MFS(R) Regatta becomes America's first non-qualified
           market-value-adjusted fixed/variable annuity.

     --    1990 -- MFS(R) World Total Return Fund is the first global balanced
           fund.

     --    1993 -- MFS(R) World Growth Fund is the first global emerging markets
           fund to offer the expertise of two sub-advisers.

     --    1993 -- MFS becomes money manager of MFS(R) Union Standard Trust, the
           first Trust to invest in companies deemed to be union-friendly by an
           Advisory Board of senior labor officials, senior managers of
           companies with significant labor contracts, academics and other
           national labor leaders or experts.

9.  DISTRIBUTION PLAN
The Trustees have adopted a Distribution Plan for Class A, Class B and Class C
shares (the "Distribution Plan") pursuant to Section 12(b) of the 1940 Act and
Rule 12b-1 thereunder (the "Rule") after having concluded that there is a
reasonable likelihood that the Distribution Plan would benefit the Fund and the
respective class of shareholders. The provisions of the Distribution Plan are
severable with respect to each Class of shares offered by the Fund. The
Distribution Plan is designed to promote sales, thereby increasing the net
assets of the Fund. Such an increase may reduce the Fund's expense ratio to the
extent the Fund's fixed costs are spread over a larger net asset base. Also, an
increase in net assets may lessen the adverse effects that could result were the
Fund required to liquidate portfolio securities to meet redemptions. There is,
however, no assurance that the net assets of the Fund will increase or that the
other benefits referred to above will be realized.

The Distribution Plan is described in the Prospectus under the caption
"Distribution Plan," which is incorporated herein by reference. The following
information supplements this Prospectus discussion.

SERVICE FEES: With respect to Class A shares, no service fees will be paid: (i)
to any dealer who is the holder or dealer of record for investors who own Class
A shares having an aggregate net asset value less than $750,000, or such other
amount as may be determined from time to time by MFD (MFD, however, may waive
this minimum amount requirement from time to time); or (ii) to any insurance
company which has entered into an agreement with the Fund and MFD that permits
such insurance company to purchase Class A shares from the Fund at their net
asset value in connection with annuity agreements issued in connection with the
insurance company's separate accounts. Dealers may from time to time be required
to meet certain other criteria in order to receive service fees.

With respect to the Class B shares, except in the case of the first year service
fee, no service fees will be paid to any securities dealer who is the holder or
dealer of record for investors who own Class B shares having an aggregate net
asset value of less than $750,000 or such other amount as may be determined by
MFD from time to time. MFD, however, may waive this minimum amount requirement
from time to time. Dealers may from time to time be required to meet certain
other criteria in order to receive service fees.

MFD or its affiliates shall be entitled to receive any service fee payable under
the Distribution Plan for which there is no dealer of record or for which
qualification standards have not been met as partial consideration for personal
services and/or account maintenance services performed by MFD or its affiliates
for shareholder accounts.

DISTRIBUTION FEES: The purpose of distribution payments to MFD under the
Distribution Plan is to compensate MFD for its distribution services to the
Fund. MFD pays commissions to dealers as well as expenses of printing
prospectuses and reports used for sales purposes, expenses with respect to the
preparation and printing of sales literature and other distribution related
expenses, including, without limitation, the cost necessary to provide
distribution-related services, or personnel, travel, office expenses and
equipment.

   
For each of the fiscal years ended September 30, 1996 and 1995, the class of
shares currently referred to as Class I shares incurred expenses under the
Distribution Plan of $71,836 and $44,473, respectively (equal to 0.15% per annum
of its average daily net assets), all of which MFD retained. For the period from
commencement of investment operations on January 14, 1994 to September 30, 1994,
the class of shares currently referred to as Class I shares incurred expenses
under the Distribution Plan of $14,882 (equal to 0.15% per annum of its average
daily net assets) all of which MFD retained. As of August 1, 1997, the
Distribution Plan for the class of shares now known as Class I shares has been
terminated.

GENERAL: The Distribution Plan will remain in effect until August 1, 1998, and
will continue in effect thereafter only if such continuance is specifically
approved at least annually by vote of both the Trustees and a majority of the
Trustees who are not "interested persons" or financially interested parties of
such Plan ("Distribution Plan Qualified Trustees"). The Distribution Plan also
requires that the Fund and MFD each shall provide the Trustees, and the Trustees
shall review, at least quarterly, a written report of the amounts expended (and
purposes therefor) under such Plan. The Distribution Plan may be terminated at
any time by vote of a majority of the Distribution Plan Qualified Trustees or by
vote of the holders of a majority of the respective class of the Fund's shares
(as defined in "Investment Restrictions"). All agreements relating to the
Distribution Plan entered into between the Fund or MFD and other organizations
must be approved by the Board of Trustees, including a majority of the
Distribution Plan Qualified Trustees. Agreements under the Distribution Plan
must be in writing, will be terminated automatically if assigned, and may be
terminated at any time without payment of any penalty, by vote of a majority of
the Distribution Plan Qualified Trustees or by vote of the holders of a majority
of the respective class of the Fund's shares. The Distribution Plan may not be
amended to increase materially the amount of permitted distribution expenses
without the approval of a majority of the respective class of the Fund's shares
(as defined in "Investment Restrictions") or may not be materially amended in
any case without a vote of the Trustees and a majority of the Distribution Plan
Qualified Trustees. The selection and nomination of Distribution Plan Qualified
Trustees shall be committed to the discretion of the non-interested Trustees
then in office. No Trustee who is not an "interested person" has any financial
interest in the Distribution Plan or in any related agreement.

10.  DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES
The Fund's Declaration of Trust permits the Trustees to issue an unlimited
number of full and fractional Shares of Beneficial Interest (without par value)
of one or more separate series and to divide or combine the shares into a
greater or lesser number of shares without thereby changing the proportionate
beneficial interests in the Fund. The Declaration of Trust further authorizes
the Trustees to classify or reclassify the shares of the Fund into one or more
classes. Pursuant thereto, the Trustees have authorized the issuance of four
classes of shares of the Fund, Class A, Class B and Class C shares, as well as
Class I shares. Each share of a class of the Fund represents an equal
proportionate interest in the assets of the Fund allocable to that class. Upon
liquidation of the Fund, the shareholders of each class of the Fund are entitled
to share pro rata in the Fund's net assets allocable to such class available for
distribution to its shareholders. The Trust reserves the right to create and
issue additional series of shares, in which case the shares of each series would
participate equally in the earnings, dividends and assets of the particular
series (subject to any class expenses) and each series may be entitled to vote
separately to approve investment advisory agreements or changes in investment
restrictions, but shareholders of all series would vote together in the election
of Trustees and the selection of accountants. The Trust reserves the right to
create additional classes of shares.
    

Shareholders are entitled to one vote for each share held and may vote in the
election of Trustees and on other matters submitted to meetings of shareholders.
Although Trustees are not elected annually by the shareholders, shareholders
have under certain circumstances the right to remove one or more Trustees in
accordance with the provisions of Section 16(c) of the 1940 Act. No material
amendment may be made to the Declaration of Trust without the affirmative vote
of a majority of the Trust's shares. Shares have no pre-emptive or conversion
rights. Shares are fully paid and non-assessable. The Trust may merge or
consolidate with another organization or sell all or substantially all of its
assets (or all or substantially all of the assets belonging to any series of the
Trust), if approved by the vote of the holders of two-thirds of its outstanding
shares voting as a single class, or of the affected series of the Trust, as the
case may be, except that if the Trustees recommend such merger, consolidation or
sale, the approval by vote of the holders of a majority of the Trust's or
affected series outstanding shares (as defined in "Investment Restrictions")
will be sufficient. The Trust or a series of the Trust may be terminated upon
liquidation and distribution of its assets, if approved by the vote of the
holders of two-thirds of its outstanding shares or by the Trustees by written
notice. If not so terminated, the Fund will continue indefinitely.

The Trust is an entity of the type commonly known as a "Massachusetts business
trust." Under Massachusetts law, shareholders of such a trust may, under certain
circumstances, be held personally liable as partners for its obligations.
However, the Declaration of Trust contains an express disclaimer of shareholder
liability for acts or obligations of the Trust and provides for indemnification
and reimbursement of expenses out of Trust property for any shareholder held
personally liable for the obligations of the Trust. The Declaration of Trust
also provides that it shall maintain appropriate insurance (for example,
fidelity bonding and errors and omissions insurance) for the protection of the
Trust, its shareholders, Trustees, officers, employees and agents covering
possible tort and other liabilities. Thus, the risk of a shareholder incurring
financial loss on account of shareholder liability is limited to circumstances
in which both inadequate insurance existed and the Fund itself was unable to
meet its obligations.

The Declaration of Trust further provides that obligations of the Trust are not
binding upon the Trustees individually but only upon the property of the Trust
and that the Trustees will not be liable for any action or failure to act, but
nothing in the Declaration of Trust protects a Trustee against any liability to
which he would otherwise be subject by reason of willful misfeasance, bad faith,
gross negligence, or reckless disregard of the duties involved in the conduct of
his office.

11.  INDEPENDENT AUDITORS AND FINANCIAL STATEMENTS
Deloitte & Touche LLP are the Fund's independent auditors, providing audit
services, tax services, and assistance and consultation with respect to the
preparation of filings with the SEC.

   
The Portfolio of Investments and Statement of Assets and Liabilities at
September 30, 1996, the Statement of Operations for the year ended September 30,
1996, the Statement of Changes in Net Assets for each of the years in the
two-year period ended September 30, 1996, the Notes to Financial Statements and
the Independent Auditors' Report, each of which is included in the Annual Report
to Shareholders of the Fund, are incorporated by reference into this SAI in
reliance upon the report of Deloitte & Touche LLP, independent auditors, given
upon their authority as experts in accounting and auditing. A copy of the Annual
Report accompanies this SAI.

The Portfolio of Investments and the Statement of Assets and Liabilities at
March 31, 1997, the Statement of Operations for the six months ended March 31,
1997, the Statements of Changes in Net Assets for the six months ended March 31,
1997 and the year ended September 30, 1996, and the Notes to Financial
Statements, each of which is included in the unaudited Semi-Annual Report to
Shareholders of the Fund, are incorporated by reference into this SAI. A copy of
the Semi-Annual Report accompanies this SAI.
    
<PAGE>

INVESTMENT ADVISER
Massachusetts Financial Services Company
500 Boylston Street, Boston, MA 02116
(617) 954-5000

DISTRIBUTOR
MFS Fund Distributors, Inc.
500 Boylston Street, Boston, MA 02116
(617) 954-5000

CUSTODIAN AND DIVIDEND DISBURSING AGENT 
State Street Bank and Trust Company 225
Franklin Street, Boston, MA 02110

   
SHAREHOLDER SERVICING AGENT
MFS Service Center, Inc.
500 Boylston Street, Boston, MA 02116
Toll free: (800) 225-2606
    

MAILING ADDRESS
P.O. Box 2281, Boston, MA 02107-9906

INDEPENDENT AUDITORS
Deloitte & Touche LLP
125 Summer Street, Boston, MA 02110


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INVESTMENT MANAGEMENT
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MFS(R) UNION STANDARD(R) EQUITY FUND
500 Boylston Street
Boston, MA 02116
    

                                  
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