MFS SERIES TRUST I
497, 1997-10-29
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<PAGE>   1


                             MFS NEW DISCOVERY FUND

      SUPPLEMENT TO THE PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION
               DATED JANUARY 1, 1997 AS REVISED NOVEMBER 1, 1997.


     THE FOLLOWING INFORMATION SHOULD BE READ IN CONJUNCTION WITH THE FUND'S
PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION ("SAI"), DATED JANUARY 1,
1997 AS REVISED NOVEMBER 1, 1997, AND CONTAINS A DESCRIPTION OF CLASS I SHARES.

     CLASS I SHARES ARE AVAILABLE FOR PURCHASE ONLY BY CERTAIN INVESTORS AS
DESCRIBED UNDER THE CAPTION "ELIGIBLE PURCHASERS" BELOW.

EXPENSE SUMMARY

<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES:                                                           CLASS I
                                                                                            -------
<S>                                                                                          <C>
   Maximum Initial Sales Charge Imposed on Purchases of Fund
     Shares (as a percentage of offering price).......................................       None
   Maximum Contingent Deferred Sales Charge (as a percentage
     of original purchase price or redemption proceeds, as applicable)................       None

ANNUAL OPERATING EXPENSES OF THE FUND (AS A PERCENTAGE OF AVERAGE NET ASSETS):
   Management Fees....................................................................       0.90%
   Rule 12b-1 Fees....................................................................       None
   Other Expenses (after expense limitation)(1)((2)...................................       0.25%
                                                                                             ----
   Total Operating Expenses (after expense limitation)(2).............................       1.15%
</TABLE>

- -----------------------
 (1) 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."
(2)  The Adviser has agreed to bear the Fund's expenses, subject to
     reimbursement by the Fund, such that "Other Expenses" do not exceed 0.25%
     per annum of its average daily net assets during the current fiscal year.
     Otherwise, "Other Expenses" and "Total Operating Expenses" would be 4.19%
     and 5.09%, respectively. See "Other Information" below.

                               EXAMPLE OF EXPENSES

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

                   PERIOD                                            CLASS I
                   ------                                            -------
                   1 year......................................        $12
                   3 years.....................................         37

     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. A more complete description of the Fund's
management fee is set forth under the caption "Management of the Fund" in the
Prospectus.

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



                                      -1-
<PAGE>   2


CONDENSED FINANCIAL INFORMATION

The following information should be read in conjunction with the financial
statements (which have not been audited) included in the July 1, 1997 Supplement
to the Statement of Additional Information.

FINANCIAL HIGHLIGHTS - CLASS I SHARES

<TABLE>
<CAPTION>
                                                                                      PERIOD ENDED
NEW DISCOVERY FUND                                                                 FEBRUARY 28, 1997*
- -----------------------------------------------------------------------------------------------------
                                                                                       (UNAUDITED)
<S>                                                                                     <C>    
Per share data (for a share outstanding throughout the period):
Net asset value - beginning of period                                                   $ 10.00
                                                                                        -------
Income from investment operations# -
Net investment income**                                                                 $  0.20
Net realized and unrealized loss
     on investments                                                                       (0.11)
                                                                                        -------
Total from investment operations                                                        $  0.09
                                                                                        -------
Net asset value - end of period                                                         $ 10.09
                                                                                        -------
Total return                                                                               0.90%###
Ratios (to average net assets)/Supplemental data**:
     Expenses                                                                              1.50%##
     Net investment income                                                                12.79%##
Portfolio turnover                                                                          327%
Average commission rate                                                                 $0.0268
Net assets at end of period (000 omitted)                                               $ 1,379
</TABLE>

- --------------------------
#       Per share data for periods is based on average shares outstanding.
##      Annualized.
###     Not annualized.
*       For the period from the commencement of investment operations, 
        January 2, 1997 to February 28, 1997.
**      The investment adviser voluntarily agreed to maintain the expenses of
        the Fund at not more than 1.50% of the Fund's average daily net assets.
        The investment adviser and distributor voluntarily waived their
        management and distribution fee respectively. To the extent actual
        expenses were over/under these limitations or had been incurred by the
        Fund, the net investment income per share and the ratios would have
        been:

     Net investment income                                            $0.15 
     Ratios (to average net assets):
         Expenses                                                      4.92%##
         Net investment income                                         9.37%##


ELIGIBLE PURCHASERS

Class I shares are available for purchase only by the following purchasers
("Eligible Purchasers"):

(i)  certain retirement plans established for the benefit of employees of
     Massachusetts Financial Services Company ("MFS"), the Fund's investment
     adviser, and employees of MFS' affiliates;



                                      -2-

<PAGE>   3

(ii)  any fund distributed by MFS Fund Distributors, Inc. ("MFD"), the Fund's
      distributor, if the fund seeks to achieve its investment objective by
      investing primarily in shares of the Fund and other funds distributed by
      MFD;

(iii) any retirement plan, endowment or foundation which (a) purchases shares
      directly through MFD (rather than through a third party broker or dealer
      or other financial intermediary); (b) has, at the time of purchase of
      Class I shares, aggregate assets of at least $100 million; and (c) invests
      at least $10 million in Class I shares of the Fund either alone or in
      combination with investments in Class I shares of other MFS funds
      distributed by MFD (additional investments may be made in any amount);
      provided that MFD may accept purchases from smaller plans, endowments or
      foundations or in smaller amounts if it believes, in its sole discretion,
      that such entity's aggregate assets will equal or exceed $100 million, or
      that such entity will make additional investments which will cause its
      total investment to equal or exceed $10 million, within a reasonable
      period of time; and

(iv)  bank trust departments which initially invest, on behalf of their trust
      clients, at least $100,000 in Class I shares of the Fund (additional
      investments may be made in any amount); provided that MFD may accept
      smaller initial purchases if it believes, in its sole discretion, that the
      bank trust department will make additional investments, on behalf of its
      trust clients, which will cause its total investment to equal or exceed
      $100,000 within a reasonable period of time.

In no event will the Fund, MFS, MFD or any of their affiliates pay any sales
commissions or compensation to any third party in connection with the sale of
Class I shares; the payment of any such sales commission or compensation would,
under the Fund's policies, disqualify the purchaser as an eligible investor in
Class I shares.

SHARE CLASSES OFFERED BY THE FUND

     Four classes of shares of the Fund currently are offered for sale, Class A
shares, Class B shares, Class C shares and Class I shares. Class I shares are
available for purchase only by Eligible Purchasers, as defined above, and are
described in this Supplement. Class A shares, Class B shares and Class C shares
are described in the Fund's Prospectus and are available for purchase by 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 contingent deferred sales
charge (a "CDSC") of 1.00% upon redemption during the first year in the case of
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 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
1.00% CDSC upon redemption during the first year and an annual distribution fee
and service fee up to a maximum of 1.00% per annum. Class I shares are offered
at net asset value without an initial sales charge or CDSC and are not subject
to a distribution or service fee. Class C shares and Class I shares do not
convert to any other class of shares of the Fund.

OTHER INFORMATION

     Eligible Purchasers may purchase Class I shares only directly through MFD.
Eligible Purchasers may exchange Class I shares of the Fund for Class I shares
of any other MFS Fund available for purchase by such Eligible Purchasers at
their net asset value (if available for sale), and may exchange Class I shares
of the Fund for shares of the MFS Money Market Fund (if available for sale), and
may redeem Class I shares of the Fund at net asset value. Distributions paid by
the Fund with respect to Class I shares generally will be greater than those




                                      -3-

<PAGE>   4

paid with respect to Class A shares, Class B shares and Class C shares because
expenses attributable to Class A shares, Class B shares and Class C shares
generally will be higher.

     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 and class
specific expenses, do not exceed 0.25% 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 August 31, 2006.

                 THE DATE OF THIS SUPPLEMENT IS NOVEMBER 1, 1997





                                      -4-
<PAGE>   5
 
                                                                      PROSPECTUS
                                                      JANUARY 1, 1997 AS REVISED
   
MFS(R) NEW DISCOVERY                                            NOVEMBER 1, 1997
    
FUND                                       CLASS A SHARES OF BENEFICIAL INTEREST
(A member of the MFS Family of Funds(R)    CLASS B SHARES OF BENEFICIAL INTEREST
                                           CLASS C SHARES OF BENEFICIAL INTEREST
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                                         PAGE
                                                                                         -----
<S> <C>                                                                                  <C>
1.  Expense Summary....................................................................      2
2.  Condensed Financial Information....................................................      3
3.  The Fund...........................................................................      4
4.  Investment Objective and Policies..................................................      4
5.  Investment Techniques and Risk Factors.............................................      5
6.  Additional Risk Factors............................................................     10
7.  Management of the Fund.............................................................     13
8.  Information Concerning Shares of the Fund..........................................     14
       Purchases.......................................................................     14
       Exchanges.......................................................................     19
       Redemptions and Repurchases.....................................................     20
       Distribution Plan...............................................................     22
       Distributions...................................................................     23
       Tax Status......................................................................     24
       Net Asset Value.................................................................     24
       Expenses........................................................................     25
       Description of Shares, Voting Rights and Liabilities............................     25
       Performance Information.........................................................     26
9.  Shareholder Services...............................................................     27
Appendix A -- Waivers of Sales Charges.................................................    A-1
</TABLE>
    
 
  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 NEW DISCOVERY FUND
    
500 BOYLSTON STREET, BOSTON, MASSACHUSETTS 02116       (617) 954-5000
 
   
This Prospectus pertains to MFS New Discovery Fund (the "Fund"), a diversified
series of MFS Series Trust I (the "Trust"). The investment objective of the Fund
is capital appreciation. The Fund invests, under normal market conditions, at
least 65% of its total assets in equity securities of companies of any size
which the Fund's investment adviser believes offer superior prospects for
growth, and emphasizes companies in the developing stages of their life cycle
that offer the potential for accelerated earnings or revenue growth (emerging
growth companies), and may invest up to 35% of its total assets in other
securities offering an opportunity for capital appreciation. The Fund may engage
in short sales. The minimum initial investment generally is $1,000 per account
(see "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 and the
Trust that a prospective investor ought to know before investing. The Trust, on
behalf of the Fund, has filed with the Securities and Exchange Commission (the
"SEC") a Statement of Additional Information ("SAI"), dated January 1, 1997 as
revised November 1, 1997, as amended or supplemented from time to time, which
contains more detailed information about the Trust and the Fund. The SAI is
incorporated into this Prospectus by reference. See page 28 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 at http://www.sec.gov site that contains the SAI materials that are
incorporated by reference into the 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>   6
 
1.  EXPENSE SUMMARY
 
   
<TABLE>
<CAPTION>
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
       offering price)...............................  5.75%             0.00%           0.00%
     Maximum Contingent Deferred Sales Charge (as a
       percentage of original purchase price or        See
       redemption proceeds, as applicable)...........  Below(1)          4.00%           1.00%
ANNUAL OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE
  DAILY NET ASSETS):
     Management Fees.................................  0.90%             0.90%           0.90%
     Rule 12b-1 Fees.................................  0.35%(2)        1.00%(3)        1.00%(3)
     Other Expenses (after expense
       limitation)(4)(5).............................  0.25%             0.25%           0.25%
                                                       ----            ----            ----
     Total Operating Expenses (after expense
       limitation)(5)................................  1.50%             2.15%           2.15%
</TABLE>
    
 
- ---------------
 
(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 ("CDSC") of 1% will be imposed on such purchases in the event
    of certain redemption transactions within 12 months following such purchases
    (see "Purchases").
 
   
(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 the 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 "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 shares 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. (See "Distribution Plan" below.)
    
 
(4) 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."
 
   
(5) The Adviser has agreed to bear the Fund's expenses, subject to reimbursement
    by the Fund, such that "Other Expenses" do not exceed 0.25% per annum of the
    Fund's average daily net assets during the current fiscal year. Otherwise,
    "Other Expenses" for Class A, Class B and Class C shares would be 4.19%, per
    annum, respectively and "Total Operating Expenses" for Class A, Class B and
    Class C shares would be 5.44%, 6.09% and 6.09%, respectively. (See
    
    "Information Concerning Shares of the Fund -- Expenses.")
 
                                        2
<PAGE>   7
 
                              EXAMPLE OF EXPENSES
 
An investor would pay the following dollar amounts of expenses on a $1,000
investment in the Fund, assuming (a) a 5% annual return and (b) unless otherwise
noted redemption at the end of each of the time periods indicated:
 
   
<TABLE>
<CAPTION>
                       PERIOD                  CLASS A       CLASS B             CLASS C
        -------------------------------------  -------     -----------     -------------------
        <S>                                    <C>         <C>     <C>     <C>         <C>
                                                                   (1)                   (1)
         1 year..............................    $72       $62     $22       $32         $22
         3 years.............................    102        97      67        67          67
</TABLE>
    
 
- ---------------
(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 Fund expenses are set
forth in the following sections: (i) varying sales charges on share
purchases -- "Purchases"; (ii) varying CDSCs -- "Purchases"; (iii) management
fees -- "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 PAST
OR FUTURE EXPENSES OF THE FUND; ACTUAL EXPENSES MAY BE GREATER OR LESS THAN
THOSE SHOWN.
 
   
2.  CONDENSED FINANCIAL INFORMATION
    
   
The following information should be read in conjunction with the financial
statements (which have not been audited) included in the Fund's Semi-Annual
Report to Shareholders which are incorporated by reference into the SAI. During
the period from January 2, 1997 to February 28, 1997, only Class A shares of the
Fund were available for sale.
    
 
                              FINANCIAL HIGHLIGHTS
 
   
<TABLE>
<CAPTION>
                                         NEW DISCOVERY FUND                                           PERIOD ENDED
- ----------------------------------------------------------------------------------------------------  FEBRUARY 28,
                                                                                                         1997*
                                                                                                      ------------
                                                                                                        CLASS A
                                                                                                      ------------
                                                                                                      (UNAUDITED)
<S>                                                                                                   <C>
Per share data (for a share outstanding throughout the period):
Net asset value -- beginning of period..............................................................    $  10.00
Income from investment operations# --
  Net investment income###..........................................................................    $   0.19
  Net realized and unrealized loss on investments...................................................       (0.10)
                                                                                                         -------
Total from investment operations....................................................................    $   0.09
Net asset value -- end of period....................................................................    $  10.09
                                                                                                         =======
Total return##......................................................................................        0.90%***
Ratios (to average net assets)/Supplemental data###:
  Expenses..........................................................................................        1.50%**
  Net investment income.............................................................................       13.90%**
Portfolio turnover..................................................................................         327%
Average commission rate.............................................................................    $ 0.0268
Net assets at end of period (000 omitted)...........................................................    $    377
</TABLE>
    
 
- ---------------
   
*    For the period from the commencement of investment operations, January 2,
     1997 to February 28, 1997.
    
 
   
**   Annualized.
    
 
   
***  Not annualized.
    
 
   
#   Per share data are based on average shares outstanding.
    
 
                                        3
<PAGE>   8
 
   
##  Total return for Class A shares does not include the applicable sales
    charge. If the charge had been included, the result would have been lower.
    
 
   
### The investment adviser voluntarily agreed to maintain the expenses of the
    Fund at not more than 1.50% of the Fund's average daily net assets. The
    investment adviser and distributor voluntarily waived their management and
    distribution fee, respectively. To the extent actual expenses were
    over/under these limitations or had been incurred by the Fund, the net
    investment income per share and the ratios would have been:
    
 
   
<TABLE>
            <S>                                                            <C>
            Net investment income........................................  $0.14
            Ratios (to average net assets):
              Expenses...................................................   5.42%**
              Net investment income......................................   9.98%**
</TABLE>
    
 
   
3.  THE FUND
    
 
   
The Fund is a series of the Trust, an open-end management investment company
which was organized as a business trust under the laws of The Commonwealth of
Massachusetts on July 30, 1986. The Trust presently consists of thirteen series,
which are offered for sale pursuant to separate prospectuses, and each of which
represents a portfolio with separate investment objectives and policies. Shares
of the Fund are sold continuously to the public and the Fund then uses the
proceeds to buy securities for its portfolio. Three classes of shares 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 Trust's Board of Trustees provides broad supervision over the affairs of the
Fund. MFS is the Fund's investment adviser and is responsible for the management
of the Fund's assets. The officers of the Trust are responsible for its
operations. The Adviser manages the Fund's portfolio from day to day in
accordance with the Fund's investment objective and policies. A majority of the
Trustees are not affiliated with the Adviser. The selection of investments and
the way they are managed depend on the conditions and trends in the economies of
the various countries of the world, their financial markets and the relationship
of their currencies to the U.S. dollar. The Trust also offers to buy back
(redeem) shares of the Fund from shareholders at any time at net asset value,
less any applicable CDSC.
    
 
4.  INVESTMENT OBJECTIVE AND POLICIES
 
   
The Fund's investment objective is capital appreciation. The Fund seeks to
achieve its objective by investing, under normal market conditions, at least 65%
of its total assets in companies that the Adviser believes offer superior
prospects for growth. Such securities may either be listed on securities
exchanges or traded in the over-the-counter markets and may be U.S. or foreign
companies. While companies in which the Fund invests may be of any size, such as
companies in a relatively early stage of development that offer the potential
for accelerated earnings or revenue growth (emerging growth companies), or
larger or more established companies whose rates of earnings growth are expected
to accelerate because of special factors, such as rejuvenated management, new
products, or structural changes in the economy, the Fund will generally invest
in companies with small market capitalizations relative to companies included in
the Standard & Poor's 500 Stock Index. Such companies generally would be
    
 
                                        4
<PAGE>   9
 
   
expected to show earnings growth over time that is well above the growth rate of
the overall economy and the rate of inflation, and would have the products,
management and market opportunities which are usually necessary to become more
widely recognized as growth companies. The Fund seeks to maintain a portfolio
weighted median capitalization of $2 billion or less.
    
 
   
The Fund may also invest in fixed income securities offering an opportunity for
capital appreciation, including up to 10% of its net assets in fixed income
securities rated BB or lower by Standard & Poor's Rating Service ("S&P"), Fitch
Investors Service, Inc. ("Fitch") or Duff & Phelps Credit Rating Co. ("Duff &
Phelps") or Ba or lower by Moody's Investors Service, Inc. ("Moody's"), or if
unrated, determined to be of equivalent quality by the Adviser (commonly
referred to as "junk bonds"). For a description of these ratings, see Appendix B
to this Prospectus (see "Additional Risk Factors -- Lower Rated Bonds" below).
    
 
   
The Fund may engage in short sales of securities which the Adviser expects to
decline in price (see "Investment Techniques -- Short Sales" below).
    
 
   
Consistent with its investment objective and policies described above, the Fund
may also invest up to, but not including, 20% of its net assets in foreign
securities which are not traded on a U.S. exchange (not including American
Depositary Receipts).
    
 
   
The Fund may engage in certain investment techniques as described under the
caption "Investment Techniques" below and in the SAI. The Fund's investments are
subject to certain risks, as described in the above-referenced sections of this
Prospectus and the SAI and as described below under the caption "Additional Risk
Factors."
    
 
5.  INVESTMENT TECHNIQUES AND RISK FACTORS
 
Additional information about certain of these investment techniques can be found
under the caption "Investment Techniques" 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 market.
 
   
FIXED INCOME SECURITIES:  Fixed income securities in which each Fund may invest
include bonds, debentures, mortgage securities, notes, bills, commercial paper,
U.S. Government Securities and certificates of deposit, as well as debt
obligations which may have a call on common stock by means of a conversion
privilege or attached warrants.
    
 
RESTRICTED SECURITIES:  The Fund may purchase securities that are not registered
under the Securities Act of 1933 (the "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 a 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 the
Adviser the daily function of determining and monitoring the liquidity of Rule
144A securities. The Board, however, retains sufficient 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 a 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, a Fund may also invest in restricted securities that may not be
sold under Rule 144A, which presents certain risks. As a result, a Fund might
not be able to sell these 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.
 
LENDING OF PORTFOLIO SECURITIES:  The Fund may seek to increase its income by
lending portfolio securities. Such loans will usually be made to member firms
(and subsidiaries thereof) of the New York Stock Exchange (the "Exchange") and
to member banks of the Federal Reserve System, and would be required to be
secured continuously by collateral in cash, irrevocable letters of credit or
U.S. Government securities maintained on a current basis at an amount at least
equal to the market value of the
 
                                        5
<PAGE>   10
 
securities loaned. If the Adviser determines to lend portfolio securities, it is
intended that the value of the securities loaned would not exceed 30% of the
value of the net assets of the Fund making the loans.
 
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, the 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). The
Fund has adopted certain procedures intended to minimize the risks of such
transactions.
 
"WHEN ISSUED" SECURITIES:  The Fund may purchase securities on a "when-issued"
or on a "forward delivery" basis, which means that the securities will be
delivered to the Fund at a future date usually beyond customary settlement time.
The commitment to purchase a security for which payment will be made on a future
date may be deemed a separate security. In general, the Fund does not pay for
such securities until received, and does not start earning interest on the
securities until the contractual settlement date. While awaiting delivery of
securities purchased on such bases, the Fund will segregate liquid assets
sufficient to cover its commitments.
 
U.S. GOVERNMENT SECURITIES:  The Fund, for temporary defensive purposes, as
discussed below, may invest, in U.S. Government securities, including: (1) the
following U.S. Treasury obligations, which differ only in their interest rates,
maturities and times of issuance: U.S. Treasury bills (maturities of one year or
less); U.S. Treasury notes (maturities of one to ten years); and U.S. Treasury
bonds (generally maturities of greater than ten years), all of which are backed
by the full faith and credit of the U.S. Government; and (2) obligations issued
or guaranteed by U.S. Government agencies, authorities or instrumentalities,
some of which are backed by the full faith and credit of the U.S. Treasury,
e.g., direct pass-through certificates of the Government National Mortgage
Association ("GNMA"); some of which are supported by the right of the issuer to
borrow from the U.S. Government, e.g., obligations of Federal Home Loan Banks;
and some of which are backed only by the credit of the issuer itself, e.g.,
obligations of the Student Loan Marketing Association (collectively, "U.S.
Government Securities"). The term "U.S. Government Securities" also includes
interests in trusts or other entities issuing interests in obligations that are
backed by the full faith and credit of the U.S. Government or are issued or
guaranteed by the U.S. Government, its agencies, authorities or
instrumentalities.
 
INVESTMENTS FOR TEMPORARY DEFENSIVE PURPOSES:  During periods of unusual market
conditions when the Adviser 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
(including foreign currency) or cash equivalents including, but not limited to,
obligations of banks (including certificates of deposit, bankers' acceptances,
time deposits and repurchase agreements), commercial paper, short-term notes,
U.S. Government Securities and related repurchase agreements.
 
FOREIGN GROWTH SECURITIES:  The Fund may invest in securities of foreign growth
companies, including established foreign companies, whose rates of earnings
growth are expected to accelerate because of special factors, such as
rejuvenated management, new products, changes in consumer demand, or basic
changes in the economic environment or which otherwise represent opportunities
for long-term growth. It is anticipated that these companies will primarily be
in nations with more developed securities markets, such as Japan, Australia,
Canada, New Zealand, Hong Kong and most Western European countries, including
Great Britain.
 
EMERGING MARKETS SECURITIES:  Consistent with the Fund's investment objective
and policies, the Fund may invest in securities of issuers whose principal
activities are located in emerging market countries (which may include foreign
governments and their subdivisions, agencies or instrumentalities). Emerging
markets include any country determined by the Adviser to have an emerging market
economy, taking into account a number of factors, including whether the country
has a low- to middle-income economy according to the International Bank for
Reconstruction and Development, the country's foreign currency debt rating, its
political and economic stability and the development of its financial and
capital markets. The Adviser determines whether an issuer's principal activities
are located in an emerging market country by considering such factors as its
country of organization, the principal trading market for its securities and the
source of its revenues and assets. The issuer's principal activities generally
 
                                        6
<PAGE>   11
 
are deemed to be located in a particular country if: (a) the security is issued
or guaranteed by the government of that country or any of its agencies,
authorities or instrumentalities; (b) the issuer is organized under the laws of,
and maintains a principal office in, that country; (c) the issuer has its
principal securities trading market in that country; (d) the issuer derives 50%
or more of its total revenues from goods sold or services performed in that
country; or (e) the issuer has 50% or more of its assets in that country.
 
   
SHORT SALES:  If the Fund anticipates that the price of a security will decline,
it may sell the security short and borrow the same type of security from a
broker or other institution to complete the sale. A Fund may make a profit or
loss depending upon whether the market price of the security decreases or
increases between the date of the short sale and the date on which the Fund must
replace the borrowed security. Possible losses from short sales differ from
losses that could be incurred from a purchase of a security, because losses from
short sales may be unlimited, whereas losses from purchases can equal only the
total amount invested. The Fund will segregate liquid assets to cover its short
sale obligations. A Fund will not sell short securities whose underlying value
exceeds 40% of its net assets.
    
 
   
INDEXED SECURITIES:  The Fund may invest in indexed securities whose value is
linked to foreign currencies, interest rates, commodities, indices or other
financial indicators. Most indexed securities are short to intermediate term
fixed income securities whose values at maturity (i.e., principal value) and/or
interest rates rise or fall according to changes in the value of one or more
specified underlying instruments. Indexed securities may be positively or
negatively indexed (i.e., their principal value or interest rates may increase
or decrease if the underlying instrument appreciates), and may have return
characteristics similar to direct investments in the underlying instrument or to
one or more options on the underlying instrument. Indexed securities may be more
volatile than the underlying instrument itself, and could involve the loss of
all or a portion of the principal amount of the investment.
    
 
   
SWAPS AND RELATED TRANSACTIONS:  As one way of managing its exposure to
different types of investments, the Fund may enter into interest rate swaps,
currency swaps and other types of available swap agreements, such as caps,
collars and floors. Swaps involve the exchange by the Fund with another party of
cash payments based upon different interest rate indices, currencies, and other
prices or rates, such as the value of mortgage prepayment rates. For example, in
the typical interest rate swap, the Fund might exchange a sequence of cash
payments based on a floating rate index for cash payments based on a fixed rate.
Payments made by both parties to a swap transaction are based on a notional
principal amount determined by the parties.
    
 
The Fund may also purchase and sell caps, floors and collars. In a typical cap
or floor agreement, one party agrees to make payments only under specified
circumstances, usually in return for payment of a fee by the counterparty. For
example, the purchase of an interest rate cap entitles the buyer, to the extent
that a specified index exceeds a predetermined interest rate, to receive
payments of interest on a contractually-based principal amount from the
counterparty selling such interest rate cap. The sale of an interest rate floor
obligates the seller to make payments to the extent that a specified interest
rate falls below an agreed-upon level. A collar arrangement combines elements of
buying a cap and selling a floor.
 
   
Swap agreements could be used to shift the Fund's investment exposure from one
type of investment to another. For example, if the Fund agreed to exchange
payments in dollars for payments in foreign currency, in each case based on a
fixed rate, the swap agreement would tend to decrease the Fund's exposure to
U.S. interest rates and increase its exposure to foreign currency and interest
rates. Caps and floors have an effect similar to buying or writing options.
Depending on how they are used, swap agreements may increase or decrease the
overall volatility of the Fund's investments and its share price and yield.
    
 
   
Swap agreements are sophisticated hedging instruments that typically involve a
small investment of cash relative to the magnitude of risks assumed or no
investment of cash. As a result, swaps can be highly volatile and may have a
considerable impact on the Fund's performance. Swap agreements are subject to
risks related to the counterparty's ability to perform, and may decline in value
if the counterparty's creditworthiness deteriorates. The Fund may also suffer
losses if it is unable to terminate outstanding swap agreements or reduce its
exposure through offsetting transactions. Swaps, caps, floors and collars are
highly specialized activities which involve certain risks.
    
 
                                        7
<PAGE>   12
 
   
OPTIONS ON SECURITIES:  The Fund may write (sell) covered put and call options
and purchase put and call options on securities. The Fund will write options on
securities for the purpose of increasing its return and/or to protect the value
of its portfolio. In particular, where the Fund writes an option that 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, 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.
 
In certain instances, the Fund may enter into options on Treasury securities
that are "reset" options or "adjustable strike" options. These options provide
for periodic adjustment of the strike price and may also provide for the
periodic adjustment of the premium during the term of the option.
 
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.
 
"YIELD CURVE" OPTIONS:  The Fund may enter into options on the yield "spread,"
or yield differential, between two securities, a transaction referred to as a
"yield curve" option, for hedging and non-hedging (an effort to increase current
income) purposes. In contrast to other types of options, a yield curve option is
based on the difference between the yields of designated securities rather than
the actual prices of the individual securities, and is settled through cash
payments. Accordingly, a yield curve option is profitable to the holder if this
differential widens (in the case of a call) or narrows (in the case of a put),
regardless of whether the yields of the underlying securities increase or
decrease. Yield curve options written by the Fund will be covered as described
in the SAI. The trading of yield curve options is subject to all the risks
associated with trading other types of options, as discussed
 
                                        8
<PAGE>   13
 
under "Additional Risk Factors" below and in the SAI. In addition, such options
present risks of loss even if the yield on one of the underlying securities
remains constant, if the spread moves in a direction or to an extent which was
not anticipated.
 
FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS:  The Fund may purchase and
sell futures contracts ("Futures Contracts") on stock indices, and may purchase
and sell Futures Contracts on foreign currencies or indices of foreign
currencies. The Fund may also purchase and write options on such Futures
Contracts. All above-referenced options on Futures Contracts are referred to as
"Options on Futures Contracts."
 
Such transactions will be entered into for hedging purposes or for non-hedging
purposes to the extent permitted by applicable law. The Fund will incur
brokerage fees when it purchases and sells Futures Contracts, and will be
required to maintain margin deposits. In addition, Futures Contracts entail
risks. Although the Adviser believes that use of such contracts will benefit the
Fund, if its investment judgment about the general direction of exchange rates
or the stock market is incorrect, the Fund's overall performance may be poorer
than if it had not entered into any such contract and the Fund may realize a
loss. The Fund will not enter into any Futures Contract if immediately
thereafter the value of securities and other obligations underlying all such
Futures Contracts would exceed 50% of the value of its total assets. In
addition, the Fund will not purchase put and call options on Futures Contracts
if as a result more than 5% of its total assets would be invested in such
options.
 
Purchases of Options on Futures Contracts may present less risk in hedging the
Fund's portfolio 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, although it may be necessary to exercise the option to
realize any profit, which results in the establishment of a futures position.
The writing of Options on Futures Contracts, 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.
 
Futures Contracts and Options on Futures Contracts that are entered into by the
Fund will be traded on U.S. and foreign exchanges.
 
FORWARD CONTRACTS:  The Fund may enter into forward foreign currency exchange
contracts for the purchase or sale of a fixed quantity of a foreign currency at
a future date at a price set at the time of the contract ("Forward Contracts").
The Fund may enter into Forward Contracts for hedging purposes and for
non-hedging purposes of increasing the Fund's current income. By entering into
transactions in Forward Contracts for hedging purposes, the Fund may be required
to forego the benefits of advantageous changes in exchange rates and, in the
case of Forward Contracts entered into for non-hedging purposes, the Fund may
sustain losses which will reduce its gross income. Such transactions, therefore,
could be considered speculative. Forward Contracts are traded over-the-counter
and not on organized commodities or securities exchanges. As a result, Forward
Contracts operate in a manner distinct from exchange-traded instruments, and
their use involves certain risks beyond those associated with transactions in
Futures Contracts or options traded on exchanges. The Fund may choose to, or be
required to, receive delivery of the foreign currencies underlying Forward
Contracts it has entered into. Under certain circumstances, such as where the
Adviser believes that the applicable exchange rate is unfavorable at the time
the currencies are received or the Adviser anticipates, for any other reason,
that the exchange rate will improve, the Fund may hold such currencies for an
indefinite period of time. The Fund may also enter into a Forward Contract on
one currency to hedge against risk of loss arising from fluctuations in the
value of a second currency (referred to as a "cross hedge") if, in the judgment
of the Adviser, a reasonable degree of correlation can be expected between
movements in the values of the two currencies. The Fund has established
procedures consistent with statements of the SEC and its staff regarding the use
of Forward Contracts by registered investment companies, which requires use of
segregated assets or "cover" in connection with the purchase and sale of such
contracts.
 
OPTIONS ON FOREIGN CURRENCIES:  The Fund may also purchase and write options on
foreign currencies ("Options on Foreign Currencies") for the purpose of
protecting against declines in the dollar value of portfolio securities and
against increases in the dollar cost of securities to be acquired. As in the
case of other types of options, however, the writing of an Option on Foreign
Currency will constitute only a partial hedge, up to the amount of the premium
received, and the Fund may be required to purchase or sell foreign currencies at
disadvantageous exchange rates, thereby incurring losses. The purchase of an
Option on
 
                                        9
<PAGE>   14
 
Foreign Currency may constitute an effective hedge against fluctuations in
exchange rates although, in the event of rate movements adverse to the Fund's
position, it may forfeit the entire amount of the premium paid for the option
plus related transaction costs. The Fund may also choose to, or be required to,
receive delivery of the foreign currencies underlying Options on Foreign
Currencies into which it has entered. Under certain circumstances, such as where
the Adviser believes that the applicable exchange rate is unfavorable at the
time the currencies are received or the Adviser anticipates, for any other
reason, that the exchange rate will improve, the Fund may hold such currencies
for an indefinite period of time.
 
6.  ADDITIONAL RISK FACTORS
 
The following discussion of additional risk factors supplements the risk factors
described above. Additional information concerning risk factors can be found
under the caption "Investment Techniques" in the SAI.
 
EMERGING GROWTH COMPANIES:  Investing in emerging growth companies involves
greater risk than is customarily associated with investing in more established
companies. Emerging growth companies often have limited product lines, markets
or financial resources, and they may be dependent on one-person management. The
securities of emerging growth companies may be subject to more abrupt or erratic
market movements than securities of larger, more established companies or the
market averages in general. Similarly, many of the securities offering the
capital appreciation sought by the Fund will involve a higher degree of risk
than would established growth stocks.
 
   
FIXED INCOME SECURITIES:  To the extent a Fund invests in fixed income
securities, the net asset value of the Fund may change as the general levels of
interest rates fluctuate. When interest rates decline, the value of fixed income
securities can be expected to rise. Conversely, when interest rates rise, the
value of fixed income securities can be expected to decline. The Funds are not
subject to restrictions on the maturities of the fixed income securities they
hold. A Fund's investments in fixed income securities with longer terms to
maturity are subject to greater volatility than the Fund's shorter-term
obligations.
    
 
   
FOREIGN SECURITIES:  The Fund may invest in dollar denominated and non-dollar
denominated foreign securities. Investing in securities of foreign issuers
generally involves risks not ordinarily associated with investing in securities
of domestic issuers. These include changes in currency rates, exchange control
regulations, securities settlement practices, governmental administration or
economic or monetary policy (in the United States or abroad) or circumstances in
dealings between nations. Costs may be incurred in connection with conversions
between various currencies. Special considerations may also include more limited
information about foreign issuers, higher brokerage costs, different accounting
standards and thinner trading markets. Foreign securities markets may also be
less liquid, more volatile and less subject to government supervision than in
the United States. Investments in foreign countries could be affected by other
factors including expropriation, confiscatory taxation and potential
difficulties in enforcing contractual obligations and could be subject to
extended settlement periods. Each Fund may hold foreign currency received in
connection with investments in foreign securities when, in the judgment of the
Adviser, it would be beneficial to convert such currency into U.S. dollars at a
later date, based on anticipated changes in the relevant exchange rate. Each
Fund may also hold foreign currency in anticipation of purchasing foreign
securities.
    
 
OPTIONS, FUTURES CONTRACTS AND FORWARD CONTRACTS:  Although the Fund may enter
into transactions in options, Futures Contracts, Options on Futures Contracts,
Forward Contracts and Options on Foreign Currencies for hedging purposes, such
transactions nevertheless involve certain risks. For example, a lack of
correlation between the 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. The Fund also
may enter into transactions in options, Futures Contracts, Options on Futures
Contracts and Forward Contracts for other than hedging purposes, which involves
greater risk. In particular, such transactions may result in losses for the Fund
which are not offset by gains on other portfolio positions, thereby reducing
gross income. In addition, foreign currency markets may be extremely volatile
from time to time. There also 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.
The SAI contains a description of the nature and trading mechanics of options,
Futures Contracts, Options on Futures Contracts, Forward Contracts and Options
on Foreign Currencies, and includes a discussion of the risks related to
transactions therein.
 
                                       10
<PAGE>   15
 
Transactions in Forward Contracts may be entered into only 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 and on foreign exchanges. In addition, the securities and indices
underlying options, Futures Contracts and Options on Futures Contracts traded by
the Fund will include both domestic and foreign securities.
 
   
AMERICAN DEPOSITARY RECEIPTS:  The Fund may invest in American Depositary
Receipts ("ADRs") which are certificates issued by a U.S. depository (usually a
bank) and represent a specified quantity of shares of an underlying non-U.S.
stock on deposit with a custodian bank as collateral. Because ADRs trade on U.S.
securities exchanges, the Adviser does not treat them as foreign securities.
However, they are subject to many of the risks of foreign securities described
above such as changes in exchange rates and more limited information about
foreign issuers.
    
 
EMERGING MARKET SECURITIES:  The Fund may invest in emerging markets. In
addition to the general risks of investing in foreign securities, investments in
emerging markets involve special risks. Securities of many issuers in emerging
markets may be less liquid and more volatile than securities of comparable
domestic issuers. These securities may be considered speculative and, while
generally offering higher income and the potential for capital appreciation, may
present significantly greater risk. Emerging markets may have different
clearance and settlement procedures, and in certain markets there have been
times when settlements have been unable to keep pace with the volume of
securities transactions, making it difficult to conduct such transactions.
Delays in settlement could result in temporary periods when a portion of the
assets of the Fund is uninvested and no return is earned thereon. The inability
of the Fund to make intended securities purchases due to settlement problems
could cause the Fund to miss attractive investment opportunities. Inability to
dispose of portfolio securities due to settlement problems could result in
losses to the Fund due to subsequent declines in value of the portfolio
security, a decrease in the level of liquidity in the Fund's portfolio, or, if
the Fund has entered into a contract to sell the security, possible liability to
the purchaser. Certain markets may require payment for securities before
delivery, and in such markets the Fund bears the risk that the securities will
not be delivered and that the Fund's payments will not be returned. Securities
prices in emerging markets can be significantly more volatile than in the more
developed nations of the world, reflecting the greater uncertainties of
investing in less established markets and economies. In particular, countries
with emerging markets may have relatively unstable governments, present the risk
of nationalization of businesses, restrictions on foreign ownership, or
prohibitions on repatriation of assets, and may have less protection of property
rights than more developed countries. The economies of countries with emerging
markets may be predominantly based on only a few industries, may be highly
vulnerable to changes in local or global trade conditions, and may suffer from
extreme and volatile debt burdens or inflation rates. Local securities markets
may trade a small number of securities and may be unable to respond effectively
to increases in trading volume, potentially making prompt liquidation of
substantial holdings difficult or impossible at times. Securities of issuers
located in countries with emerging markets may have limited marketability and
may be subject to more abrupt or erratic movements in price.
 
Certain emerging markets may require governmental approval for the repatriation
of investment income, capital or the proceeds of sales of securities by foreign
investors. In addition, if a deterioration occurs in an emerging market's
balance of payments or for other reasons, a country could impose temporary
restrictions on foreign capital remittances. The Fund could be adversely
affected by delays in, or a refusal to grant, any required governmental approval
for repatriation of capital, as well as by the application to the Fund of any
restrictions on investments.
 
Investment in certain foreign emerging market debt obligations may be restricted
or controlled to varying degrees. These restrictions or controls may at times
preclude investment in certain foreign emerging market debt obligations and
increase the expenses of the Fund.
 
   
LOWER RATED BONDS:  The Fund may invest in fixed income securities, and may
invest in convertible securities, rated Baa by Moody's or BBB by S&P, Fitch or
Duff & Phelps and comparable unrated securities. These securities, while
normally exhibiting adequate protection parameters, have speculative
characteristics and changes in economic conditions or other circumstances are
more likely to lead to a weakened capacity to make principal and interest
payments than in the case of higher grade securities.
    
 
                                       11
<PAGE>   16
 
   
The Funds may also invest in securities rated Ba or lower by Moody's or BB or
lower by S&P, Fitch or Duff & Phelps and comparable unrated securities (commonly
known as "junk bonds") to the extent described above. These securities are
considered speculative and, while generally providing greater income than
investments in higher rated securities, will involve greater risk of principal
and income (including the possibility of default or bankruptcy of the issuers of
such securities) and may involve greater volatility of price (especially during
periods of economic uncertainty or change) than securities in the higher rating
categories. However, since yields vary over time, no specific level of income
can ever be assured. These lower rated high yielding fixed income securities
generally tend to reflect economic changes and short-term corporate and industry
developments to a greater extent than higher rated securities which react
primarily to fluctuations in the general level of interest rates (although these
lower rated fixed income securities are also affected by changes in interest
rates, the market's perception of their credit quality, and the outlook for
economic growth). In the past, economic downturns or an increase in interest
rates have, under certain circumstances, caused a higher incidence of default by
the issuers of these securities and may do so in the future, especially in the
case of highly leveraged issuers. During certain periods, the higher yields on a
Fund's lower rated high yielding fixed income securities are paid primarily
because of the increased risk of loss of principal and income, arising from such
factors as the heightened possibility of default or bankruptcy of the issuers of
such securities. Due to the fixed income payments of these securities, a Fund
may continue to earn the same level of interest income while its net asset value
declines due to portfolio losses, which could result in an increase in the
Fund's yield despite the actual loss of principal. The market for these lower
rated fixed income securities may be less liquid than the market for investment
grade fixed income securities, and judgment may at times play a greater role in
valuing these securities than in the case of investment grade fixed income
securities. Changes in the value of securities subsequent to their acquisition
will not affect cash income or yield to maturity to a Fund but will be reflected
in the net asset value of shares of the Fund.
    
 
PORTFOLIO TRADING:  The Fund intends to manage its portfolio by buying and
selling securities, as well as holding securities to maturity, to help attain
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. In trading portfolio securities, the Fund seeks to take advantage of
market developments. 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. (the "NASD") and such
other policies as the Trustees of the Trust may determine, the Adviser may
consider sales of shares of other investment company clients of MFD, the
distributor of shares of the Trust and of the MFS Family of Funds (the "MFS
Funds"), as a factor in the selection of broker-dealers to execute the Fund's
portfolio transactions. From time to time the Adviser may direct certain
portfolio transactions to broker-dealer firms which, in turn, have agreed to pay
a portion of the Fund's operating expenses (e.g., fees charged by the custodian
of the Fund's assets). For the fiscal year ended August 31, 1996, the Fund had a
portfolio turnover rate of 104%. Transaction costs incurred by the Fund and the
realized capital gains and losses of the Fund may be greater than a fund with a
lesser portfolio turnover rate.
                            ------------------------
 
   
The SAI includes a discussion of other investment policies and a listing of
specific investment restrictions which govern the investment policies of the
Fund. The specific investment restrictions listed in the SAI may be changed
without shareholder approval unless indicated otherwise (see the SAI). Except
with respect to the fund's policy on borrowing and investing in illiquid
securities, the Fund's investment limitations, policies and rating standards 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.
    
 
                                       12
<PAGE>   17
 
7.  MANAGEMENT OF THE FUND
 
   
INVESTMENT ADVISER -- The Adviser manages the Fund pursuant to an Investment
Advisory Agreement dated October 30, 1997. The Fund's portfolio manager is Brian
E. Stack, a Vice President of the Adviser. Mr. Stack has been the portfolio
manager of the Fund since the Fund's inception and has been employed as a
portfolio manager by the Adviser since 1993. Prior to 1993, Mr. Stack was
employed by Robertson, Stephens & Co. as a securities analyst. Under the
Advisory Agreement, the Adviser provides the Fund with overall investment
advisory services. Subject to such policies as the Trustees may determine, the
Adviser makes investment decisions for the Fund. For its services and
facilities, the Adviser is entitled to receive a management fee, computed and
paid monthly, in an amount equal to the sum of 0.90% of the Fund's average daily
net assets. For the period from the commencement of investment operations,
January 2, 1997, to November 1, 1997, the Adviser waived its right to receive
management fees from the Fund. On October 30, 1997, shareholders of the Fund
approved an increase in the Fund's management fee from 0.75% per annum to 0.90%
per annum pursuant to a new investment advisory agreement.
    
 
MFS also serves as investment adviser to each of the other MFS Funds and to
MFS(R) 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 U.S., Massachusetts Investors Trust.
Net assets under the management of the MFS organization were approximately $52.3
billion on behalf of approximately 2.2 million investor accounts as of November
29, 1996. As of such date, the MFS organization managed approximately $20.3
billion of assets invested in fixed income funds and fixed income portfolios,
approximately $4.1 billion of assets invested in foreign securities, and
approximately $28.1 billion of assets invested in equity securities. 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 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 U.S. since 1895, establishing
a headquarters office 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 also the Chairman,
President and a Trustee of the Trust. W. Thomas London, Stephen E. Cavan, James
R. Bordewick, Jr., James O. Yost, Ellen Moynihan and Mark E. Bradley, all of
whom are officers of MFS, are officers of the Trust.
    
 
   
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. Some simultaneous
transactions are inevitable when several clients receive investment advice from
MFS, 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 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 of each of the other MFS
Funds.
 
                                       13
<PAGE>   18
 
SHAREHOLDER SERVICING AGENT -- MFS Service Center, Inc. (the "Shareholder
Servicing Agent"), a wholly owned subsidiary of MFS, performs transfer agency
and certain other services for the Fund.
 
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, 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:
- --------------------------------------------------------------------------------
 
<TABLE>
<CAPTION>
                                                        SALES CHARGE* AS                  DEALER
                                                         PERCENTAGE OF:               ALLOWANCE AS A
                                                   OFFERING       NET AMOUNT           PERCENTAGE OF
             AMOUNT OF PURCHASE                     PRICE          INVESTED           OFFERING PRICE
- -------------------------------------------------------------------------------------------------------
<S>                                                <C>            <C>               <C>
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                  1.70
$1,000,000 or more...........................      None**         None**                See Below**
- -------------------------------------------------------------------------------------------------------
</TABLE>
 
 *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 an initial sales charge). In the following
five circumstances, Class A shares of the Fund are also 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
 
                                       14
<PAGE>   19
 
Funds would be in an aggregate 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 establishes 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 establishes 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 plan'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:
 
<TABLE>
<CAPTION>
COMMISSION PAID BY MFD TO DEALERS       CUMULATIVE PURCHASE AMOUNT
- ---------------------------------     -------------------------------
<C>                                   <S>
              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
</TABLE>
 
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 made on or after
April 1, 1996, 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 are 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
 
                                       15
<PAGE>   20
 
     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 as follows:
 
<TABLE>
<CAPTION>
                                        YEAR OF                             CONTINGENT
                                     REDEMPTION                           DEFERRED SALES
                                   AFTER PURCHASE                             CHARGE
                ----------------------------------------------------      ---------------
                <S>                                                       <C>
                First...............................................              4%
                Second..............................................              4%
                Third...............................................              3%
                Fourth..............................................              3%
                Fifth...............................................              2%
                Sixth...............................................              1%
                Seventh and following...............................              0%
</TABLE>
 
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
 
                                       16
<PAGE>   21
 
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 same 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 bear 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 of 1.00% upon redemption during the first
year. Class C shares do not convert to any other class of shares. The maximum
investment in Class C shares is up to $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 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 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 Individual
Retirement Accounts ("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.
 
                                       17
<PAGE>   22
 
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 reserves 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
individuals, if (i) the individual or organization makes three or more exchange
requests out of the Fund per calendar 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 and exchange requests by market
timers. In the event that any individual or entity is determined either by the
Fund or MFD, in its sole discretion, to be a market timer with respect to any
calendar year, the Fund and/or MFD will reject all exchange requests into the
Fund during the remainder of that year. Other funds in the MFS Funds may have
different and/or more or less 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.
 
                                       18
<PAGE>   23
 
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.
 
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 EXCHANGES FROM MFS MONEY MARKET FUNDS): No
initial sales charge 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 above in this
paragraph.
 
GENERAL: A shareholder should read the prospectus of the other MFS Fund 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
 
                                       19
<PAGE>   24
 
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 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.
 
                                       20
<PAGE>   25
 
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 B and Class C 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. For 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.
 
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.
 
IN-KIND DISTRIBUTIONS. The Trust agrees to redeem shares of the Fund solely in
cash up to the lesser of $250,000 or 1% of the net asset value of the Fund
during any 90-day period for any one shareholder. The Fund has reserved the
right to pay other redemptions either totally or partially, by a distribution
in-kind of securities (instead of cash) from the Fund's portfolio. The
securities distributed in such a distribution would be valued at the same amount
as that assigned to them in calculating the net
 
                                       21
<PAGE>   26
 
asset value for the shares being sold. If a shareholder received a distribution
in-kind, the shareholder could incur brokerage or transaction charges when
converting the securities to cash.
 
   
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, except in the case of accounts
being established for monthly automatic investments and certain payroll savings
programs or exchanges, 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 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 in addition to the service fee described above 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 expenses 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.
 
                                       22
<PAGE>   27
 
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
therefor, 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 of 1.00% upon redemption during the
first year. 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. Prior to November 1, 1997, MFD waived
its right to receive the distribution and service fees for Class A shares.
    
 
DISTRIBUTIONS
The Fund intends to pay substantially all of its net investment income to its
shareholders as dividends at least annually. 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. If the Fund earns less than projected, or
otherwise distributes more than its earnings for the year, a portion of the
distributions may constitute a return of
 
                                       23
<PAGE>   28
 
capital. The Fund may make one or more distributions during the calendar year to
its shareholders from any long-term capital gains and may also make one or more
distributions during the calendar year to its shareholders from short-term
capital gains. Shareholders may elect to receive dividends and capital gain
distributions in either cash or additional shares of the same class with respect
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 intends to qualify each year as a
"regulated investment company" under Subchapter M of 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 federal
income or excise taxes, although the Fund's foreign-source income may be subject
to foreign withholding taxes.
 
Shareholders of the Fund normally 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, whether the distribution is paid in cash or reinvested in
additional shares. A portion of the dividends received from the Fund (but none
of the Fund's capital gains distributions) may qualify for the dividends
received deduction for corporations. Shortly after the end of each calendar
year, each 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.
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 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 at the rate
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 additional
information regarding backup withholding of federal income tax and should
consult their own tax advisers as to the tax consequences to them of an
investment in the Fund.
 
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. 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 values or otherwise at their fair values, as described in the SAI.
All investments and assets are expressed in U.S. dollars based upon current
currency exchange rates. The net asset value per share of each class of shares
is effective for orders received in "good order" by the dealer prior to its
calculation and received by the dealer prior to the close of that business day.
 
                                       24
<PAGE>   29
 
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) 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 repurchasing and redeeming
shares and servicing shareholder accounts; expenses of preparing, printing and
mailing prospectuses, periodic reports, notices and proxy statements to
shareholders and to governmental officers 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 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, transaction costs and class
specific expenses, do not exceed 0.25% 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 August 31, 2006.
    
 
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. As of the date of this
Prospectus, the Trust has thirteen series of shares. The Trust has reserved the
right to create and issue additional classes and series of shares, in which case
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 are entitled to one vote for each share held and shares 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.
Additionally, each class of shares of a series will vote separately on any
material increases 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 series on all other matters.
The Trust does not intend to hold annual shareholder meetings. The Trust'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).
 
Each share of a class of the Fund represents an equal proportionate interest in
that Fund with each other class share, subject to the liabilities of the
particular class. Shares have no pre-emptive or conversion rights (except as set
forth 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
 
                                       25
<PAGE>   30
 
assignments and in certain other limited circumstances. Certain of the MFS
retirement plans own 98% of the Class A shares of the Fund and therefore control
the Fund.
 
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 risk of a shareholder incurring financial loss on account of
shareholder liability would be limited to circumstances in which both inadequate
insurance existed and the Trust itself was unable to meet its obligations.
 
   
As of May 31, 1997, The MFS Defined Contribution Plan, Massachusetts Financial
Services, 500 Boylston Street, Boston, MA 02116-3740 owned, of record, 75.40% of
the outstanding shares of the Fund, and, therefore, controls the Fund.
    
 
PERFORMANCE INFORMATION
From time to time, the Fund may provide yield, current distribution rate and
total rate of return quotations for each class of 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. Yield
quotations are based on the annualized net investment income per share allocated
to each class of a Fund over a 30-day period stated as a percent of the maximum
public offering price of that class on the last day of that period. Yield
calculations for Class B and Class C shares assume no CDSC is paid. The current
distribution rate for each class is generally based upon the total amount of
dividends per share paid by the Fund to shareholders of that class during the
past 12 months and is computed by dividing the amount of such dividends by the
maximum public offering price of that class at the end of such period. Current
distribution rate calculations for Class B and Class C shares assumes no CDSC is
paid. The current distribution rate differs from the yield calculation because
it may include distributions to shareholders from sources other than dividends
and interest, such as premium income from option writing, short-term capital
gains, and return of invested capital, and is calculated over a different period
of time. Total rate of return quotations will reflect the average annual
percentage change over stated periods in the value of an investment in each
class of shares of the Fund made at the maximum public offering price of the
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 the 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.
 
All performance quotations are based on historical performance and are not
intended to indicate future performance. Yield reflects only net portfolio
income as of a stated period of time and current distribution rate reflects only
the rate of distributions paid by the Fund over a stated period of time, while
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 yield, current
distribution rate and total rate of return, see the SAI. For further information
about the Fund's performance for the fiscal year ended August 31, 1996, please
see the Fund's annual report. A copy of the Fund's 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.
 
                                       26
<PAGE>   31
 
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). 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.
 
ACCOUNT AND CONFIRMATION STATEMENTS -- Each shareholder will receive
confirmation statements showing the transaction activity in his account. 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 described below) 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 (including short-term capital gains) in cash; capital gain
       distributions reinvested in additional shares; or
 
    -- 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 record date. 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 distribution 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 Class B or Class C shares 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 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 agreements 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 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 in shares of the
 
                                       27
<PAGE>   32
 
same class of another MFS Fund, if shares of such Fund are available for sale
(without a sales charge and not subject to any applicable CDSC).
 
    SYSTEMATIC WITHDRAWAL PLAN -- A shareholder may direct the Shareholder
Servicing Agent to send to him (or any one 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 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 participate in 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 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 of
shares of 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 transferred 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 an investment program concurrently with a withdrawal program
would 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 share redemption (if applicable) 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, Simplified Employee Pension 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 January 1, 1997 as revised November 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) the Fund's
investment policies and restrictions; (ii) the Trustees, officers and Adviser;
(iii) portfolio trading; (iv) the shares, including rights and liabilities of
shareholders; (v) tax status of dividends and distributions; (vi) the
Distribution Plan; and (vii) various services and privileges provided by the
Fund for the benefit of its shareholders, including additional information with
respect to the exchange privilege.
    
 
                                       28
<PAGE>   33
 
                                                                      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 CDSC for Class
A shares are 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, are waived:
 
1. DIVIDEND REINVESTMENT
 
  - Shares acquired through dividend or capital gain reinvestment; and
 
  - Shares acquired by automatic reinvestment of distributions of dividends and
    capital gains of any fund in the MFS Funds pursuant to the Distribution
    Investment Program.
 
2. CERTAIN ACQUISITIONS/LIQUIDATIONS
 
  - 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:
 
  - Officers, eligible directors, employees (including retired employees) and
    agents of MFS, Sun Life or any of their subsidiary companies;
 
  - Trustees and retired trustees of any investment company for which MFD serves
    as distributor;
 
  - Employees, directors, partners, officers and trustees of any sub-adviser to
    any MFS Fund;
 
   
  - Employees or registered representatives of dealers;
    
 
  - 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
 
  - Institutional Clients of MFS or MFS Institutional Advisors, Inc.
 
4. INVOLUNTARY REDEMPTIONS (CDSC WAIVER ONLY)
 
  - 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.
 
                                       A-1
<PAGE>   34
 
5. RETIREMENT PLANS (CDSC WAIVER ONLY).  Shares redeemed on account of
distributions made under the following circumstances:
 
  INDIVIDUAL RETIREMENT ACCOUNTS ("IRAs")
 
  - Death or disability of the IRA owner.
 
  SECTION 401(a) PLANS ("401(a) PLANS") AND SECTION 403(b) EMPLOYER SPONSORED
PLANS ("ESP PLANS")
 
  - Death, disability or retirement of 401(a) or ESP Plan participant;
 
   
  - Loan from 401(a) or ESP Plan;
    
 
  - Financial hardship (as defined in Treasury Regulation Section
    1.401(k)-1(d)(2), as amended from time to time);
 
  - Termination of employment of 401(a) or ESP Plan participant (excluding,
    however, a partial or other termination of the Plan);
 
  - Tax-free return of excess 401(a) or ESP Plan contributions;
 
  - 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 Plan sponsor subscribes to the MFS FUNDamental
    401(k) Plan or another similar recordkeeping system made available by the
    Shareholder Servicing Agent; and
 
  - 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")
 
  - Death or disability of SRO Plan participant.
 
6. CERTAIN TRANSFERS OF REGISTRATION (CDSC WAIVER ONLY). Shares transferred:
 
  - 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
 
  - 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
    
 
   
  - 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).
    
 
                                       A-2
<PAGE>   35
 
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 are waived:
 
   
1. WRAP ACCOUNT AND FUND "SUPERMARKET" INVESTMENTS
    
 
   
  - 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 Supermarket account or a similar program under which
    such clients pay a fee to such dealer.
    
 
   
2. INVESTMENT BY INSURANCE COMPANY SEPARATE ACCOUNTS
    
 
  - Shares acquired by insurance company separate accounts.
 
   
3. RETIREMENT PLANS
    
 
  ADMINISTRATIVE SERVICES ARRANGEMENTS
 
   
  - 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
 
  - 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:
 
  IRAs
 
  - Distributions made on or after the IRA owner has attained the age of 59 1/2
    years old; and
 
  - Tax-free returns of excess IRA contributions.
 
  401(a) PLANS
 
  - Distributions made on or after the 401(a) Plan participant has attained the
    age of 59 1/2 years old; and
 
  - Certain involuntary redemptions and redemptions in connection with certain
    automatic withdrawals from a 401(a) Plan.
 
  ESP PLANS AND SRO PLANS
 
   
  - Distributions made on or after the ESP or SRO Plan participant has attained
    the age of 59 1/2 years old.
    
 
                                       A-3
<PAGE>   36
 
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
 
  - 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
 
  - 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
 
  - 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:
 
  IRAs, 401(a) PLANS, ESP PLANS AND SRO PLANS
 
  - 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 Code rules.
 
  - Salary Reduction Simplified Employee Pension Plans ("SAR-SEP Plans")
 
  - 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; and
 
  - Death or disability of a SAR-SEP Plan participant.
 
                                       A-4
<PAGE>   37

THE MFS FAMILY OF FUNDS(R) MARK AMERICA'S OLDEST MUTUAL FUND GROUP

The members of the MFS Family of Funds are grouped below according to the 
types of securities in their portfolios. For free prospectuses containing 
more complete information, including the exchange privilege and all charges 
and expenses, please contact your financial adviser or call MFS at 
1-800-225-2606 any business day from 8 a.m. to 8 p.m. Eastern time. This 
material should be read carefully before investing or sending money.

<TABLE>
<S>                                                    <C>
STOCK                                                  WORLD
- ----------------------------------------------------   ----------------------------------------------------
Massachusetts Investors Trust                          MFS(R)/Foreign & Colonial Emerging
Massachusetts Investors Growth Stock Fund                 Markets Equity Fund
MFS(R) Emerging Growth Fund                            MFS(R) International Growth Fund (3)
MFS(R) Equity Income Fund                              MFS(R) International Growth and Income Fund (4)
MFS(R) Growth Opportunities Fund                       MFS(R) World Asset Allocation Fund SM
MFS(R) Large Cap Growth Fund (1)                       MFS(R) World Equity Fund
MFS(R) Managed Sectors Fund                            MFS(R) World Governments Fund
MFS(R) Mid Cap Growth Fund (2)                         MFS(R) World Growth Fund
MFS(R) New Discovery Fund                              MFS(R) World Total Return Fund
MFS(R) Research Fund
MFS(R) Research Growth and Income Fund                 NATIONAL TAX-FREE BOND
MFS(R) Strategic Growth Fund                           ----------------------------------------------------
MFS(R) Union Standard(R) Mark Equity Fund              MFS(R) Municipal Bond Fund
MFS(R) Value Fund                                      MFS(R) Municipal High Income Fund
                                                       MFS(R) Municipal Income Fund
STOCK AND BOND
- ----------------------------------------------------   STATE TAX-FREE BOND
MFS(R) Total Return Fund                               ----------------------------------------------------
MFS(R) Utilities Fund                                  Alabama, Arkansas, California, Florida, Georgia,
                                                       Maryland, Massachusetts, Mississippi, New York,
BOND                                                   North Carolina, Pennsylvania, South Carolina,
- ----------------------------------------------------   Tennessee, Virginia, West Virginia
MFS(R) Bond Fund
MFS(R) Government Mortgage Fund                        MONEY MARKET
MFS(R) Government Securities Fund                      ----------------------------------------------------
MFS(R) High Income Fund                                MFS(R) Cash Reserve Fund
MFS(R) Intermediate Income Fund                        MFS(R) Government Money Market Fund
MFS(R) Strategic Income Fund                           MFS(R) Money Market Fund

LIMITED MATURITY BOND
- ----------------------------------------------------   (1) Formerly MFS(R) Capital Growth Fund.
MFS(R)                                                 (2) Formerly MFS(R) OTC Fund.
Government Limited Maturity Fund                       (3) Formerly MFS(R)/Foreign & Colonial
MFS(R) Limited Maturity Fund                                International Growth Fund.
MFS(R) Municipal Limited Maturity Fund                 (4) Formerly MFS(R)/Foreign & Colonial
                                                            International Growth and Income Fund.
                                                                                                  
                                               
</TABLE>                                               
                                               
                                               
                                               
                                               
<PAGE>   38








Investment Adviser                                [MFS LOGO]
Massachusetts Financial Services Company
500 Boylston Street
Boston, MA 02116
(617) 954-5000

Distributor                                       MFS(R) NEW DISCOVERY FUND
MFS Fund Distributors, Inc.                       
500 Boylston Street                               Prospectus
Boston, MA 02116                                  January 1, 1997
(617) 954-5000                                    as revised
                                                  November 1, 1997
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
Ernst & Young LLP
200 Clarendon Street
Boston, MA 02116






[MFS LOGO]


MFS(R) NEW DISCOVERY FUND
500 Boylston Street
Boston, MA 02116


                            MND-1-11/97/60M
<PAGE>   39
 
[MFS LOGO]
   
MFS(R) NEW DISCOVERY FUND                               STATEMENT OF
                                                        ADDITIONAL INFORMATION
    

   
(A member of the MFS Family of Funds(R))                January 1, 1997 as
                                                        revised November 1, 1997
    
- --------------------------------------------------------------------------------
 
   
<TABLE>
<CAPTION>
                                                                                              Page
                                                                                              ----
<C>   <S>                                                                                     <C>
  1. Definitions...........................................................................     2
  2. Investment Objective, Policies and Restrictions.......................................     2
         Investment Techniques.............................................................     2
  3. Management of the Fund................................................................    15
         Trustees..........................................................................    15
         Officers..........................................................................    16
         Trustee Compensation Table........................................................    16
         Investment Adviser................................................................    17
         Custodian.........................................................................    17
         Shareholder Servicing Agent.......................................................    17
         Distributor.......................................................................    18
  4. Portfolio Transactions and Brokerage Commissions......................................    18
  5. Shareholder Services..................................................................    19
         Investment and Withdrawal Programs................................................    19
         Exchange Privilege................................................................    22
         Tax-Deferred Retirement Plans.....................................................    22
  6. Tax Status............................................................................    23
  7. Distribution Plan.....................................................................    24
  8. Determination of Net Asset Value and Performance......................................    25
  9. Description of Shares, Voting Rights and Liabilities..................................    28
 10. Independent Auditors and Financial Statements.........................................    28
</TABLE>
    
 
   
MFS(R) NEW DISCOVERY FUND
    
A series of MFS Series Trust I
500 Boylston Street, Boston, MA 02116
(617) 954-5000
 
   
This Statement of Additional Information ("SAI"), as amended or supplemented
from time to time, sets forth information which may be of interest to investors
but which is not necessarily included in the Fund's Prospectus dated January 1,
1997 as revised November 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 back cover 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>   40
 
1. DEFINITIONS
 
   
<TABLE>
<S>                    <C>  <C>
"Fund"                 --   MFS New Discovery Fund, a diversified series of the
                              Trust.
"Trust"                --   MFS Series Trust I, a Massachusetts business Trust,
                              organized on July 22, 1986. The Trust was known as
                              "MFS Lifetime Managed Sectors Fund" prior to
                              August 1, 1993, and as "Lifetime Managed Sectors
                              Trust" prior to August 3, 1992.
"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 January 1, 1997 as
                              revised November 1, 1997, as amended or
                              supplemented from time to time. 
</TABLE>
    
 
2. INVESTMENT OBJECTIVE, POLICIES AND RESTRICTIONS
 
INVESTMENT OBJECTIVE AND POLICIES. The investment objective and policies of the
Fund are described in the Prospectus and below. The following discussion of the
Fund's investment techniques and restrictions supplements, and should be read in
conjunction with, the information set forth in the "Investment Objective and
Policies," "Investment Techniques" and "Additional Risk Factors" sections of the
Prospectus.
 
INVESTMENT TECHNIQUES
 
LENDING OF PORTFOLIO SECURITIES: The Fund may seek to increase its income by
lending portfolio securities. Such loans will usually be made only to member
firms (and subsidiaries thereof) of the New York Stock Exchange (the "Exchange")
and member banks of the Federal Reserve System, and would be required to be
secured continuously by collateral in cash, an irrevocable letter of credit or
U.S. Government securities maintained on a current basis at an amount at least
equal to the market value of the securities loaned. A Fund would have the right
to call a loan and obtain the securities loaned at any time on customary
industry settlement notice (which will not usually exceed five business days).
For the duration 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 from the investment of the collateral (if the
collateral is in the form of cash). The Fund would not, however, have the right
to vote any securities having voting rights during the existence of the loan,
but the Fund 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 should the borrower of the securities fail financially. However, the
loans would be made only to firms deemed by the Adviser to be of good standing,
and when, in the judgment of the Adviser, the consideration which can be earned
currently from securities loans of this type justifies the attendant risk. If
the Adviser determines to make securities loans, it is intended that the value
of the securities loaned would not exceed 30% of the value of the Fund's net
assets.
 
REPURCHASE AGREEMENTS: The Fund may enter into repurchase agreements with
sellers who are member firms (or a subsidiary thereof) of the Exchange or
members of the Federal Reserve System, recognized primary U.S. Government
securities dealers or institutions which the Adviser 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 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 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 the Adviser has determined that the
seller is creditworthy, and the Adviser monitors that seller's creditworthiness
on an ongoing basis. Moreover, under such agreements, the value 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.
 
"WHEN-ISSUED" SECURITIES: The Fund may purchase securities on a "when-issued" or
on a "forward delivery" basis. When the Fund commits to purchase these
securities on a "when-issued" or "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. Although the Fund does not intend to make such
purchases for speculative purposes and intends to adhere to the provisions of
 
                                        2
<PAGE>   41
 
the SEC policy, 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.
 
FOREIGN SECURITIES: The Fund may invest in dollar-denominated and non
dollar-denominated foreign securities. As discussed in the Prospectus, investing
in foreign securities generally represents a greater degree of risk than
investing in domestic securities due to possible exchange rate fluctuations,
less publicly available information, more volatile markets, less securities
regulation, less favorable tax provisions, war or expropriation. As a result of
its investments in foreign securities, the Fund may receive interest or dividend
payments, or the proceeds of the sale or redemption of such securities, in the
foreign currencies in which such securities are denominated. Under certain
circumstances, such as where the Adviser believes that the applicable exchange
rate is unfavorable at the time the currencies are received or the Adviser
anticipates, for any other reason, that the exchange rate will improve, the Fund
may hold such currencies for an indefinite period of time. While the holding of
currencies will permit the Fund to take advantage of favorable movements in the
applicable exchange rate, such strategy also exposes the Fund to risk of loss if
exchange rates move in a direction adverse to the Fund's position. Such losses
could reduce any profits or increase any losses sustained by the Fund from the
sale or redemption of securities and could reduce the dollar value of interest
or dividend payments received.
 
AMERICAN DEPOSITARY RECEIPTS: The Fund may invest in American Depositary
Receipts ("ADRs") which are certificates issued by a U.S. depository (usually a
bank) and represent a specified quantity of shares of an underlying non-U.S.
stock on deposit with a custodian bank as collateral. ADRs may be sponsored or
unsponsored. A sponsored ADR is issued by a depository which has an exclusive
relationship with the issuer of the underlying security. An unsponsored ADR may
be issued by any number of U.S. depositories. Under the terms of most sponsored
arrangements, depositories agree to distribute notices of shareholder meetings
and voting instructions, and to provide shareholder communications and other
information to the ADR holders at the request of the issuer of the deposited
securities. The depository of an unsponsored ADR, on the other hand, is under no
obligation to distribute shareholder communications received from the issuer of
the deposited securities or to pass through voting rights to ADR holders in
respect of the deposited securities. The Fund may invest in either type of ADR.
Although the U.S. investor holds a substitute receipt of ownership rather than
direct stock certificates, the use of the depository receipts in the U.S. can
reduce costs and delays as well as potential currency exchange and other
difficulties. The Fund may purchase securities in local markets and direct
delivery of these ordinary shares to the local depository of an ADR agent bank
in the foreign country. Simultaneously, the ADR agents create a certificate
which settles at the Fund's custodian in five days. The Fund may also execute
trades on the U.S. markets using existing ADRs. A foreign issuer of the security
underlying an ADR is generally not subject to the same reporting requirements in
the U.S. as a domestic issuer. Accordingly, the information available to a U.S.
investor will be limited to the information the foreign issuer is required to
disclose in its own country and the market value of an ADR may not reflect
undisclosed material information concerning the issuer of the underlying
security. ADRs may also be subject to exchange rate risks if the underlying
foreign securities are denominated in foreign currency.
 
   
SHORT SALES: The Fund may seek to hedge investments or realize additional gains
through short sales. Short sales are transactions in which a Fund sells a
security it does not own, in anticipation of a decline in the market value of
that security. To complete such a transaction, the Fund must borrow the security
to make delivery to the buyer. The Fund then is obligated to replace the
security borrowed by purchasing it at the market price at the time of
replacement. The price at such time may be more or less than the price at which
the security was sold by the Fund. Until the security is replaced, the Fund is
required to repay the lender any dividends or interest which accrue during the
period of the loan. To borrow the security, the Fund also may be required to pay
a premium, which would increase the cost of the security sold. The net proceeds
of the short sale will be retained by the broker, to the extent necessary to
meet margin requirements, until the short position is closed out. The Fund also
will incur transaction costs in effecting short sales.
    
 
   
The Fund will incur a loss as a result of the short sale if the price of the
security increases between the date of the short sale and the date on which the
Fund replaces the borrowed security. The Fund will realize a gain if the
security declines in price between those dates. The amount of any gain will be
decreased, and the amount of any loss increased, by the amount of the premium,
dividends or interest the Fund may be required to pay in connection with a short
sale.
    
 
   
The Fund may make short sales "against the box," i.e., when a security identical
to or convertible or exchangeable into one owned by the Fund is borrowed and
sold short. The Fund may also enter into so called "naked" short sales, i.e.,
when a security identical to or exchangeable into the security borrowed and sold
short is not owned by the Fund.
    
 
   
No securities will be sold short by the Fund if, after effect is given to any
such short sale, the total market value of all securities sold short would
exceed 40% of the value of the Fund's net assets.
    
 
   
Whenever the Fund engages in short sales, its custodian segregates liquid assets
in an amount that, when combined with the amount of collateral deposited with
the broker in connection with the short sale, equals the current market value of
the security sold short. The segregated assets are marked to market daily.
    
 
                                        3
<PAGE>   42
 
INDEXED SECURITIES: The Fund may purchase securities whose prices are indexed to
the prices of other securities, securities indices, currencies, precious metals
or other commodities, or other financial indicators. Indexed securities
typically, but not always, are debt securities or deposits whose value at
maturity (i.e., principal value) or coupon rate is determined by reference to a
specific instrument or statistic. Gold-indexed securities, for example,
typically provide for a maturity value that depends on the price of gold,
resulting in a security whose price tends to rise and fall together with gold
prices. Currency-indexed securities typically are short-term to
intermediate-term debt securities whose maturity values or interest rates are
determined by reference to the values of one or more specified foreign
currencies, and may offer higher yields than U.S. dollar-denominated securities
of equivalent issuers. Currency-indexed securities may be positively or
negatively indexed; that is, their principal value or interest rates may
increase when the specified currency value increases, resulting in a security
that performs similarly to a foreign-denominated instrument, or their maturity
value may decline when foreign currencies increase, resulting in a security
whose price characteristics are similar to a put on the underlying currency.
Currency-indexed securities may also have prices that depend on the values of a
number of different foreign currencies relative to each other.
 
   
The performance of indexed securities depends to a great extent on the
performance of the security, currency, or other instrument to which they are
indexed, and may also be influenced by interest rate changes in the U.S. and
abroad. At the same time, indexed securities are subject to the credit risks
associated with the issuer of the security, and their values may decline
substantially if the issuer's creditworthiness deteriorates and could involve
the loss of all or a portion of the principal amount of the investment. Recent
issuers of indexed securities have included banks, corporations, and certain
U.S. government agencies.
    
 
SWAPS AND RELATED TRANSACTIONS: The Fund may enter into interest rate swaps,
currency swaps and other types of available swap agreements, such as caps,
collars and floors.
 
Swap agreements may be individually negotiated and structured to include
exposure to a variety of different types of investments or market factors.
Depending on their structure, swap agreements may increase or decrease the
Fund's exposure to long or short-term interest rates (in the U.S. or abroad),
foreign currency values, mortgage securities, corporate borrowing rates, or
other factors such as securities prices or inflation rates. Swap agreements can
take many different forms and are known by a variety of names. The Fund is not
limited to any particular form or variety of swap agreement if MFS determines it
is consistent with the Fund's investment objective and policies.
 
The Fund will maintain cash or appropriate liquid assets with its custodian to
cover its current obligations under swap transactions. If the Fund enters into a
swap agreement on a net basis (i.e., the two payment streams are netted out,
with the Fund receiving or paying, as the case may be, only the net amount of
the two payments), the Fund will maintain cash or liquid assets with its
custodian with a daily value at least equal to the excess, if any, of the Fund's
accrued obligations under the swap agreement over the accrued amount the Fund is
entitled to receive under the agreement. If the Fund enters into a swap
agreement on other than a net basis, it will maintain cash or liquid assets with
a value equal to the full amount of the Fund's accrued obligations under the
agreement.
 
The most significant factor in the performance of swaps, caps, floors and
collars is the change in the specific interest rate, currency or other factor
that determines the amount of payments to be made under the arrangement. If the
Adviser is incorrect in its forecasts of such factors, the investment
performance of the Fund would be less than what it would have been if these
investment techniques had not been used. If a swap agreement calls for payments
by the Fund, the Fund must be prepared to make such payments when due. In
addition, if the counterparty's creditworthiness declined, the value of the swap
agreement would be likely to decline, potentially resulting in losses.
 
If the counterparty defaults, the Fund's risk of loss consists of the net amount
of payments that the Fund is contractually entitled to receive. The Fund
anticipates that it will be able to eliminate or reduce its exposure under these
arrangements by assignment or other disposition or by entering into an
offsetting agreement with the same or another counterparty.
 
OPTIONS ON SECURITIES: The Fund may write (sell) covered put and call options,
and purchase put and call 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 counter party 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
 
                                        4
<PAGE>   43
 
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 deposited 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 option 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 value 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 also 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
 
                                        5
<PAGE>   44
 
profit. By using put options in this way, the Fund will reduce any profit it
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 also 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.
 
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, cannot exceed a certain
percentage of the Fund's assets (the "SEC illiquidity ceiling"). Although the
Adviser 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 by the Federal
Reserve Bank of New York. Also, the contracts which the Fund has in place with
such primary dealers will 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 will generally be based on
a multiple of the premium received by a 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
part of the formula price as illiquid for purposes of the SEC illiquidity
ceiling. The Fund may also write over-the-counter options with non-primary
dealers, including foreign dealers, and will treat the assets used to cover
these options as illiquid for purposes of such SEC illiquidity ceiling.
 
RESET OPTIONS: In certain instances, the Fund may enter into options on U.S.
Treasury securities which provide for periodic adjustment of the strike price
and may also provide for the periodic adjustment of the premium during the term
of each such option. Like other types of options, these transactions, which may
be referred to as "reset" options or "adjustable strike" options grant the
purchaser the right to purchase (in the case of a call) or sell (in the case of
a put), a specified type of U.S. Treasury security at any time up to a stated
expiration date (or, in certain instances, on such date). In contrast to other
types of options, however, the price at which the underlying security may be
purchased or sold under a "reset" option is determined at various intervals
during the term of the option, and such price fluctuates from interval to
interval based on changes in the market value of the underlying security. As a
result, the strike price of a "reset" option, at the time of exercise, may be
less advantageous than if the strike price had been fixed at the initiation of
the option. In addition, the premium paid for the purchase of the option may be
determined at the termination, rather than the initiation, of the option. If the
premium is paid at termination, the Fund assumes the risk that (i) the premium
may be less than the premium which would otherwise have been received at the
initiation of the option because of such factors as the volatility in yield of
the underlying Treasury security over the term of the option and adjustments
made to the strike price of the option, and (ii) the option purchaser may
default on its obligation to pay the premium at the termination of the option.
 
OPTIONS ON STOCK INDICES: 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 the Adviser, are expected to be similar 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 in 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
 
                                        6
<PAGE>   45
 
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 stocks 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.
 
"YIELD CURVE" OPTIONS: The Fund may also enter into options on the "spread," or
yield differential, between two fixed income securities, in transactions
referred to as "yield curve" options. In contrast to other types of options, a
yield curve option is based on the difference between the yields of designated
securities, rather than the prices of the individual securities, and is settled
through cash payments. Accordingly, a yield curve option is profitable to the
holder if this differential widens (in the case of a call) or narrows (in the
case of a put), regardless of whether the yields of the underlying securities
increase or decrease.
 
Yield curve options may be used for the same purposes as other options on
securities. Specifically, the Fund may purchase or write such options for
hedging purposes. For example, the Fund may purchase a call option on the yield
spread between two securities, if it owns one of the securities and anticipates
purchasing the other security and wants to hedge against an adverse change in
the yield spread between the two securities. The Fund may also purchase or write
yield curve options for other than hedging purposes (i.e., in an effort to
increase its current income) if, in the judgment of the Adviser, the Fund will
be able to profit from movements in the spread between the yields of the
underlying securities. The trading of yield curve options is subject to all of
the risks associated with the trading of other types of options. In addition,
however, such options present risk of loss even if the yield of one of the
underlying securities remains constant, if the spread moves in a direction or to
an extent which was not anticipated. Yield curve options written by the Fund
will be "covered." A call (or put) option is covered if the Fund holds another
call (or put) option on the spread between the same two securities and maintains
in a segregated account with its custodian liquid assets sufficient to cover the
Fund's net liability under the two options. Therefore, the Fund's liability for
such a covered option is generally limited to the difference between the amount
of the Fund's liability under the option written by the Fund less the value of
the option held by the Fund. Yield curve options may also be covered in such
other manner as may be in accordance with the requirements of the counterparty
with which the option is traded and applicable laws and regulations. Yield curve
options are traded over-the-counter and because they have been only recently
introduced, established trading markets for these securities have not yet
developed. Because these securities are traded over-the-counter, the SEC has
taken the position that yield curve options are illiquid and, therefore, cannot
exceed the SEC illiquidity ceiling. (See "Options on Securities.")
 
FUTURES CONTRACTS: The Fund may purchase and sell futures contracts ("Futures
Contracts") on stock indices, and may purchase and sell Futures Contracts on
foreign currencies or indices of foreign currencies. 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 foreign currency, or
for the making and acceptance of a cash settlement, at a stated time in the
future for a
 
                                        7
<PAGE>   46
 
fixed price. By its terms, a Futures Contract provides for a specified
settlement date on which, in the case of the majority of interest rate and
foreign currency futures contracts, the fixed income securities or currency are
delivered by the seller and paid for by the purchaser, or on which, in the case
of stock index futures contracts and certain interest rate and foreign currency
futures contracts, 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 or
instrument underlying the Futures Contract fluctuates, making positions in the
Futures Contract more or less valuable -- a process known as "mark-to-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.
 
Interest rate Futures Contracts may be purchased or sold to attempt to protect
against the effects of interest rate changes on the Fund's current or intended
investments in fixed income securities. For example, if the Fund owned long-term
bonds and interest rates were expected to increase, the Fund might enter into
interest rate futures contracts for the sale of debt securities. Such a sale
would have much the same effect as selling some of the long-term bonds in the
Fund's portfolio. If interest rates did increase, the value of the debt
securities in the portfolio would decline, but the value of the Fund's interest
rate futures contracts would increase at approximately the same rate, thereby
keeping the net asset value of the Fund from declining as much as it otherwise
would have.
 
Similarly, if interest rates were expected to decline, interest rate futures
contracts may be purchased to hedge in anticipation of subsequent purchases of
long-term bonds at higher prices. Since the fluctuations in the value of the
interest rate futures contracts should be similar to that of long-term bonds,
the Fund could protect itself against the effects of the anticipated rise in the
value of long-term bonds without actually buying them until the necessary cash
became available or the market had stabilized. At that time, the interest rate
futures contracts could be liquidated and the Fund's cash reserves could then be
used to buy long-term bonds on the cash market. The Fund could accomplish
similar results by selling bonds with long maturities and investing in bonds
with short maturities when interest rates are expected to increase. However,
since the futures market is more liquid than the cash market, the use of
interest rate futures contracts as a hedging technique allows the Fund to hedge
its interest rate risk without having to sell its portfolio securities.
 
As noted in the Prospectus, the Fund may purchase and sell foreign currency
futures contracts for hedging purposes, to attempt to protect its current or
intended investments from fluctuations in currency exchange rates. Such
fluctuations could reduce the dollar value of portfolio securities denominated
in foreign currencies, or increase the cost of foreign-denominated securities to
be acquired, even if the value of such securities in the currencies in which
they are denominated remains constant. The Fund may sell futures contracts on a
foreign currency, for example, where it holds securities denominated in such
currency and it anticipates a decline in the value of such currency relative to
the dollar. In the event such decline occurs, the resulting adverse effect on
the value of foreign-denominated securities may be offset, in whole or in part,
by gains on the futures contracts.
 
Conversely, the Fund could protect against a rise in the dollar cost of
foreign-denominated securities to be acquired by purchasing futures contracts on
the relevant currency, which could offset, in whole or in part, the increased
cost of such securities resulting from a rise in the dollar value of the
underlying currencies. Where the Fund purchases futures contracts under such
circumstances, however, and the prices of securities to be acquired instead
decline, the Fund will sustain losses on its futures position which could reduce
or eliminate the benefits of the reduced cost of portfolio securities to be
acquired.
 
FORWARD CONTRACTS: The Fund may enter into contracts for the purchase or sale of
a specific currency at a future date at a price set at the time the contract is
entered into (a "Forward Contract"), for hedging purposes as well as for
non-hedging purposes. The Fund may also enter into Forward Contracts for
"cross-hedging" purposes as noted in the Prospectus. The Fund will enter into
Forward Contracts for the purpose of protecting its current or intended
investments from fluctuations in currency exchange rates.
 
                                        8
<PAGE>   47
 
A Forward Contract to sell a currency may be entered into where the Fund seeks
to protect against an anticipated increase in the exchange rate for a specific
currency which could reduce the dollar value of portfolio securities denominated
in such currency. Conversely, the Fund may enter into a Forward Contract to
purchase a given currency to protect against a projected increase in the dollar
value of securities denominated in such currency which the Fund intends to
acquire.
 
If a hedging transaction in Forward Contracts is successful, the decline in the
value of portfolio securities or the increase in the cost of securities to be
acquired may be offset, at least in part, by profits on the Forward Contract.
Nevertheless, by entering into such Forward Contracts, the Fund may be required
to forego all or a portion of the benefits which otherwise could have been
obtained from favorable movements in exchange rates. The Fund does not presently
intend to hold Forward Contracts entered into until maturity, at which time it
would be required to deliver or accept delivery of the underlying currency, but
will seek in most instances to close out positions in such Contracts by entering
into offsetting transactions, which will serve to fix the Fund's profit or loss
based upon the value of the Contracts at the time the offsetting transaction is
executed.
 
The Fund has established procedures consistent with statements by the SEC and
its staff regarding the use of Forward Contracts by registered investment
companies, which require the use of segregated assets or "cover" in connection
with the purchase and sale of such Contracts. In those instances in which the
Fund satisfies this requirement through segregation of assets, it will maintain,
in a segregated account, liquid assets, which will be marked to market on a
daily basis, in an amount equal to the value of its commitments under Forward
Contracts.
 
OPTIONS ON FUTURES CONTRACTS: The Fund also may purchase and write options to
buy or sell those Futures Contracts in which it may invest ("Options on Futures
Contracts") as described above under "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 Fund (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
Commodities Futures Trading Commission (the "CFTC") and the performance
guarantee of the exchange clearinghouse. In addition, Options on Futures
Contracts may be traded on foreign exchanges. The Fund may cover the writing of
call Options on Futures Contracts (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
 
                                        9
<PAGE>   48
 
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 or changes in interest or exchange rates, 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 in 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 or changes in interest or exchange rates, the Fund could
purchase call Options on Futures Contracts, rather than purchasing the
underlying Futures Contracts.
 
OPTIONS ON FOREIGN CURRENCIES: The Fund may purchase and write options on
foreign currencies for hedging purposes in a manner similar to that in which
futures contracts on foreign currencies, or Forward Contracts, will be utilized.
For example, a decline in the dollar value of a foreign currency in which
portfolio securities are denominated will reduce the dollar value of such
securities, even if their value in the foreign currency remains constant. In
order to protect against such diminutions in the value of portfolio securities,
the Fund may purchase put options on the foreign currency. If the value of the
currency does decline, the Fund will have the right to sell such currency for a
fixed amount in dollars and will thereby offset, in whole in part, the adverse
effect on its portfolio which otherwise would have resulted.
 
Conversely, where a rise in the dollar value of a currency in which securities
to be acquired are denominated is projected, thereby increasing the cost of such
securities, the Fund may purchase call options thereon. The purchase of such
options could offset, at least partially, the effects of the adverse movements
in exchange rates. As in the case of other types of options, however, the
benefit to the Fund deriving from purchases of foreign currency options will be
reduced by the amount of the premium and related transaction costs. In addition,
where currency exchange rates do not move in the direction or to the extent
anticipated, the Fund could sustain losses on transactions in foreign currency
options which would require it to forego a portion or all of the benefits of
advantageous changes in such rates. The Fund may write options on foreign
currencies for the same types of hedging purposes. For example, where the Fund
anticipates a decline in the dollar value of foreign-denominated securities due
to adverse fluctuations in exchange rates it could, instead of purchasing a put
option, write a call option on the relevant currency. If the expected decline
occurs, the option will most likely not be exercised, and the diminution in
value of portfolio securities will be offset by the amount of the premium
received less related transaction costs. As in the case of other types of
options, therefore, the writing of Options on Foreign Currencies will constitute
only a partial hedge.
 
Similarly, instead of purchasing a call option to hedge against an anticipated
increase in the dollar cost of securities to be acquired, the Fund could write a
put option on the relevant currency which, if rates move in the manner
projected, will expire unexercised and allow the Fund to hedge such increased
cost up to the amount of the premium. Foreign currency options written by the
Fund will generally be covered in a manner similar to the covering of other
types of options. As in the case of other types of options, however, the writing
of a foreign currency option will constitute only a partial hedge up to the
amount of the premium, and only if rates move in the expected direction. If this
does not occur, the option may be exercised and the Fund would be required to
purchase or sell the underlying currency at a loss which may not be offset by
the amount of the premium. Through the writing of options on foreign currencies,
the Fund also may be required to forego all or a portion of the benefits which
might otherwise have been obtained from favorable movements in exchange rates.
 
ADDITIONAL RISK FACTORS:
 
OPTIONS, FUTURES AND FORWARD 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, Options on Futures
Contracts, Forward Contracts and options on foreign currencies depends 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, and in the case of futures and options on fixed
income securities, the portfolio securities which are being hedged may not be
the same type of obligation underlying such contract. The use of Forward
Contracts for "cross hedging" purposes may involve greater correlation risks. 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. In
addition, the Fund may enter into transactions in Forward Contracts or options
on foreign currencies in order to hedge
 
                                       10
<PAGE>   49
 
against exposure arising from the currencies underlying such instruments. In
such instances, the Fund will be subject to the additional risk of imperfect
correlation between changes in the value of the currencies underlying such
forwards or options and changes in the value of the currencies being hedged. 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 narrowly-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, options and Forward Contracts 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, futures and forward markets. In this regard, trading by
speculators in options, futures and Forward 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 Contracts 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,
options on currencies 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 forego 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 assets 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 transactions in options (except for Options on Foreign
Currencies), Futures Contracts, Options on Futures Contracts and Forward
Contracts for non-hedging purposes as well as hedging purposes. 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 liquid assets 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. Entering into
transactions in Futures Contracts, Options on Futures Contracts and Forward
Contracts for other than hedging purposes could expose the Fund to significant
risk of loss if foreign currency exchange rates do not move in the direction or
to the extent anticipated.
 
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
 
                                       11
<PAGE>   50
 
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 contract 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 to the
daily limit on a number of consecutive trading days.
 
The trading of Futures Contracts and options is also subject to the risk of
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 exchange 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 portfolios
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 described 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, currency or Futures Contract.
 
RISKS OF TRANSACTIONS RELATED TO FOREIGN CURRENCIES AND TRANSACTIONS NOT
CONDUCTED ON U.S. EXCHANGES -- Transactions in Forward Contracts on foreign
currencies, as well as futures and options on foreign currencies and
transactions executed on foreign exchanges, are subject to all of the
correlation, liquidity and other risks outlined above. In addition, however,
such transactions are subject to the risk of governmental actions affecting
trading in or the prices of currencies underlying such contracts, which could
restrict or eliminate trading and could have a substantial adverse effect on the
value of positions held by the Fund. Further, the value of such positions could
be adversely affected by a number of other complex political and economic
factors applicable to the countries issuing the underlying currencies.
 
Further, unlike trading in most other types of instruments, there is no
systematic reporting of last sale information with respect to the foreign
currencies underlying contracts thereon. As a result, the available information
on which trading systems will be based may not be as complete as the comparable
data on which the Fund makes investment and trading decisions in connection with
other transactions. Moreover, because the foreign currency market is a global,
24-hour market, events could occur in that market which will not be reflected in
the forward, futures or options market until the following day, thereby making
it more difficult for the Fund to respond to such events in a timely manner.
 
Settlements of exercises of over-the-counter Forward Contracts or foreign
currency options generally must occur within the country issuing the underlying
currency, which in turn requires traders to accept or make delivery of such
currencies in conformity with any U.S. or foreign restrictions and regulations
regarding the maintenance of foreign banking relationships, fees, taxes or other
charges.
 
                                       12
<PAGE>   51
 
Unlike transactions entered into by the Fund in Futures Contracts and
exchange-traded options, options on foreign currencies, Forward Contracts and
over-the-counter options on securities are not traded on contract markets
regulated by the CFTC or (with the exception of certain foreign currency
options) the SEC. To the contrary, such instruments are traded through financial
institutions acting as market-makers, although foreign currency options are also
traded on certain national securities exchanges, such as the Philadelphia Stock
Exchange and the Chicago Board Options Exchange, subject to SEC regulation. In
an over-the-counter trading environment, many of the protections afforded to
exchange participants will not be available. For example, there are no daily
price fluctuation limits, and adverse market movements could therefore continue
to an unlimited extent over a period of time. Although the purchaser of an
option cannot lose more than the amount of the premium plus related transaction
costs, this entire amount could be lost. Moreover, the option writer and a
trader of Forward Contracts could lose amounts substantially in excess of their
initial investments, due to the margin and collateral requirements associated
with such positions.
 
In addition, over-the-counter transactions can only be entered into with a
financial institution willing to take the opposite side, as principal, of the
Fund's position unless the institution acts as broker and is able to find
another counterparty willing to enter into the transaction with the Fund. Where
no such counterparty is available, it will not be possible to enter into a
desired transaction. There also may be no liquid secondary market in the trading
of over-the-counter contracts, and the Fund could be required to retain options
purchased or written, or Forward Contracts entered into, until exercise,
expiration or maturity. This in turn could limit the Fund's ability to profit
from open positions or to reduce losses experienced, and could result in greater
losses.
 
Further, over-the-counter transactions are not subject to the guarantee of an
exchange clearinghouse, and the Fund will therefore be subject to the risk of
default by, or the bankruptcy of, the financial institution serving as its
counterparty. One or more of such institutions also may decide to discontinue
their role as market-makers in a particular currency or security, thereby
restricting the Fund's ability to enter into desired hedging transactions. The
Fund will enter into an over-the-counter transaction only with parties whose
creditworthiness has been reviewed and found satisfactory by the Adviser.
 
Options on securities, options on stock indices, Futures Contracts, Options on
Futures Contracts and options on foreign currencies may be traded on exchanges
located in foreign countries. Such transactions may not be conducted in the same
manner as those entered into on U.S. exchanges, and may be subject to different
margin, exercise, settlement or expiration procedures. As a result, many of the
risks of over-the-counter trading may be present in connection with such
transactions.
 
Options on foreign currencies traded on national securities exchanges are within
the jurisdiction of the SEC, as are other securities traded on such exchanges.
As a result, many of the protections provided to traders on organized exchanges
will be available with respect to such transactions. In particular, all foreign
currency option positions entered into on a national securities exchange are
cleared and guaranteed by the Options Clearing Corporation (the "OCC"), thereby
reducing the risk of counterparty default. Further, a liquid secondary market in
options traded on a national securities exchange may be more readily available
than in the over-the-counter market, potentially permitting the Fund to
liquidate open positions at a profit prior to exercise or expiration, or to
limit losses in the event of adverse market movements.
 
The purchase and sale of exchange-traded foreign currency options, however, is
subject to the risks of the availability of a liquid secondary market described
above, as well as the risks regarding adverse market movements, margining of
options written, the nature of the foreign currency market, possible
intervention by governmental authorities and the effects of other political and
economic events. In addition, exchange-traded options on foreign currencies
involve certain risks not presented by the over-the-counter market. For example,
exercise and settlement of such options must be made exclusively through the
OCC, which has established banking relationships in applicable foreign countries
for this purpose. As a result, the OCC may, if it determines that foreign
governmental restrictions or taxes would prevent the orderly settlement of
foreign currency option exercises, or would result in undue burdens on the OCC
or its clearing member, impose special procedures on exercise and settlement,
such as technical changes in the mechanics of delivery of currency, the fixing
of dollar settlement prices or prohibitions on exercise.
 
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. In addition, the Fund must comply with the requirements of
various state securities laws in connection with such transactions.
 
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. In addition, the Fund will not purchase put and call
options on Futures Contracts 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 ensuring that the leveraging effect of such Futures Contract is
minimized.
 
                                       13
<PAGE>   52
 
   
RISKS OF INVESTING IN LOWER RATED BONDS -- The Fund may invest in fixed income
securities, and may invest in convertible securities, rated Baa by Moody's
Investors Service, Inc. ("Moody's") or BBB by Standard & Poor's Ratings Services
("S&P"), Fitch Investors Service, Inc. ("Fitch") or Duff & Phelps Credit Rating
Co. ("Duff & Phelps"), and comparable unrated securities. These securities,
while normally exhibiting adequate protection parameters, have speculative
characteristics and changes in economic conditions or other circumstances are
more likely to lead to a weakened capacity to make principal and interest
payments than in the case of higher grade fixed income securities.
    
 
   
The Funds may also invest in fixed income securities rated Ba or lower by
Moody's or BB or lower by S&P, Fitch or Duff & Phelps, and comparable unrated
securities (commonly known as "junk bonds") to the extent described in the
Prospectus. No minimum rating standard is required by a Fund. These securities
are considered speculative and, while generally providing greater income than
investments in higher rated securities, will involve greater risk of principal
and income (including the possibility of default or bankruptcy of the issuers of
such securities) and may involve greater volatility of price (especially during
periods of economic uncertainty or change) than securities in the higher rating
categories and because yields vary over time, no specific level of income can
ever be assured. These lower rated high yielding fixed income securities
generally tend to reflect economic changes (and the outlook for economic
growth), short-term corporate and industry developments and the market's
perception of their credit quality (especially during times of adverse
publicity) to a greater extent than higher rated securities which react
primarily to fluctuations in the general level of interest rates (although these
lower rated fixed income securities are also affected by changes in interest
rates). In the past, economic downturns or an increase in interest rates have,
under certain circumstances, caused a higher incidence of default by the issuers
of these securities and may do so in the future, especially in the case of
highly leveraged issuers. The prices for these securities may be affected by
legislative and regulatory developments. The market for these lower rated fixed
income securities may be less liquid than the market for investment grade fixed
income securities. Furthermore, the liquidity of these lower rated securities
may be affected by the market's perception of their credit quality. Therefore,
the Adviser's judgment may at times play a greater role in valuing these
securities than in the case of investment grade fixed income securities, and it
also may be more difficult during times of certain adverse market conditions to
sell these lower rated securities to meet redemption requests or to respond to
changes in the market.
    
 
   
While the Adviser may refer to ratings issued by established credit rating
agencies, it is not a Fund's policy to rely exclusively on ratings issued by
these rating agencies, but rather to supplement such ratings with the Adviser's
own independent and ongoing review of credit quality. To the extent a Fund
invests in these lower rated securities, the achievement of its investment
objectives may be a more dependent on the Adviser's own credit analysis than in
the case of a fund investing in higher quality fixed income securities. These
lower rated securities may also include zero coupon bonds, deferred interest
bonds and PIK bonds.
    
 
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.
 
The policies stated above are not fundamental and may be changed without
shareholder approval, as may the Fund's investment objective.
 
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 a series or class, as applicable or
(ii) 67% or more of the outstanding shares of the Trust or a series or class, as
applicable, present at a meeting at which holders of more than 50% of the
outstanding shares of the Trust or a series or class, as applicable are
represented in person or by proxy):
 
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, Options on Foreign Currency and any other type of option,
 Futures Contracts, any other type of futures contract, and Forward 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, Options on Foreign Currency and any other type of option, Futures
 Contracts, any other type of futures contract, and Forward 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, as amended (the "1940 Act"). For purposes of this restriction,
 collateral arrangements with respect to any type of option (including Options
 on Futures Contracts, Options, Options on Stock Indices and Options on Foreign
 Currencies), short sale, Forward Contracts, Futures Contracts, any other type
 of futures contract, 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
 
                                       14
<PAGE>   53
 
 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, more than 25% 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).
 
   
Except with respect to Investment Restriction (1) and non-fundamental investment
policy (1), these investment 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.
    
 
In addition, the Fund has the following nonfundamental policies which may be
changed without shareholder approval. 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 1933 Act 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 15% 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 10% 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) invest for the purpose of exercising control or management;
 
  (4) purchase securities issued by any other investment company in excess of
 the amount permitted by the 1940 Act; currently, the Fund does not intend to
 invest more than 5% of its net assets in such securities;
 
  (5) purchase or retain securities of an issuer any of whose officers,
 directors, trustees or security holders is an officer or Trustee of the Trust,
 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 1/2 of 1% of the
 securities of such issuer, and such persons owning more than 1/2 of 1% of such
 securities together own beneficially more than 5% of such securities;
 
  (6) 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, Options on Stock Indices and Options on Foreign Currencies), any short
 sale, any type of futures contract (including Futures Contracts), and Forward
 Contracts;
 
  (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, Options on
 Stock Indices and Options on Foreign Currencies), any short sale, any type of
 futures contract (including Futures Contracts), Forward Contracts and payments
 of initial and variation margin in connection therewith, are not considered a
 pledge of assets; or
 
  (9) 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, indices of securities, Options on Foreign Currencies or
 any type of futures contract (including Futures Contracts) or (b) the purchase,
 ownership, holding or sale of contracts for the future delivery of securities
 or currencies.
 
3. MANAGEMENT OF THE FUND
 
The Trust's Board of Trustees provides broad supervision over the affairs of the
Fund. The Adviser 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 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
 
RICHARD B. BAILEY* (born 9/14/26)
Private Investor; Massachusetts Financial Services Company, former Chairman and
  Director (prior to September 30, 1991); Cambridge Bancorp, Director; Cambridge
  Trust Company, Director
 
MARSHALL N. COHAN (born 11/14/26)
Private Investor
Address: 2524 Bedford Mews Drive, Wellington, Florida
 
LAWRENCE H. COHN, M.D., (born 3/11/37)
Brigham and Women's Hospital, Chief of Cardiac Surgery; Harvard Medical School,
  Professor of Surgery
Address: 75 Francis Street, Boston, Massachusetts
 
                                       15
<PAGE>   54
 
THE HON. SIR J. DAVID GIBBONS, KBE (born 6/15/27)
   
Edmund Gibbons Limited, Chief Executive Officer; Colonial Insurance Company,
  Ltd., Chairman; The Bank of N.T. Butterfield & Son Ltd., Chairman (prior to
  November, 1997)
    
Address: 21 Reid Street, Hamilton, Bermuda
 
ABBY M. O'NEILL (born 4/27/28)
Private Investor; Rockefeller Financial Services, Inc. (investment advisers),
  Director
Address: 30 Rockefeller Plaza, Room 5600, New York, New York
 
   
WALTER E. ROBB, III (born 8/18/26)
    
Benchmark Advisors, Inc. (corporate financial consultants), President and
  Treasurer; Benchmark Consulting Group, Inc. (office services), President;
  Landmark Funds (mutual funds), Trustee
Address: 110 Broad Street, Boston, Massachusetts
 
ARNOLD D. SCOTT* (born 12/16/42)
Massachusetts Financial Services Company, Senior Executive Vice President and
  Secretary
 
JEFFREY L. SHAMES* (born 6/2/55)
Massachusetts Financial Services Company, President
 
J. DALE SHERRATT (born 9/23/38)
Insight Resources, Inc. (acquisition planning specialists), President
Address: One Liberty Square, Boston, Massachusetts
 
WARD SMITH (born 9/13/30)
NACCO Industries (holding company), Chairman (prior to June 1994); Sundstrand
  Corporation (diversified mechanical manufacturer), Director
Address: 5875 Landerbrook Drive, Mayfield Heights, Ohio
 
OFFICERS
 
W. THOMAS LONDON,* Treasurer (born 3/1/44)
Massachusetts Financial Services Company, Senior Vice President
 
JAMES O. YOST,* Assistant Treasurer (born 6/12/60)
Massachusetts Financial Services Company, Vice President
 
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)
    
 
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)
    
 
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
- ---------------
 
*"Interested persons" (as defined in the 1940 Act) of the Adviser, whose address
is 500 Boylston Street, Boston, Massachusetts 02116.
 
Each Trustee and 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. Mr. Brodkin, the Chairman of MFD, Messrs. Shames and
Scott, Directors of MFD, and Mr. Cavan, the Secretary of MFD, hold similar
positions with certain other MFS affiliates. Mr. Bailey is a Director of Sun
Life Assurance Company of Canada (U.S.) ("Sun Life of Canada (U.S.)"), the
corporate parent of MFS.
 
While the Fund pays the compensation of the non-interested Trustees and Mr.
Bailey, the Trustees are currently waiving their rights to receive such fees.
The Fund has adopted a retirement plan for non-interested Trustees and Mr.
Bailey. Under this plan, a Trustee will retire upon reaching age 75 and if the
Trustee has completed at least 5 years of service, he would be entitled to
annual payments during his lifetime of up to 50% of such Trustee's average
annual compensation (based on the three years prior to his retirement) depending
on his length of service. A Trustee may also retire prior to age 75 and receive
reduced payments if he has completed at least 5 years of service. Under the
plan, a Trustee (or his beneficiaries) will also receive benefits for a period
of time in the event the Trustee is disabled or dies. These benefits will also
be based on the Trustee's average annual compensation and length of service.
There is no retirement plan provided by the Trust for Messrs. Brodkin, Scott and
Shames. The Fund will accrue its allocable portion of compensation expenses
under the retirement plan each year to cover the current year's service and
amortize past service cost.
 
TRUSTEE COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                           TRUSTEE     RETIREMENT
                            FEES        BENEFIT
                            FROM       ACCRUED AS    TOTAL TRUSTEE
                             THE      PART OF FUND     FEES FROM
         TRUSTEE           FUND(1)     EXPENSE(1)   FUND COMPLEX(3)
- -------------------------- -------    ------------  ---------------
<S>                        <C>        <C>           <C>
Richard B. Bailey.........   $ 0           $0          $ 263,815
A. Keith Brodkin..........     0            0                  0
Marshall N. Cohan.........     0            0            148,624
Dr. Lawrence Cohn.........     0            0            135,874
Sir David Gibbons.........     0            0            135,874
Abby M. O'Neill...........     0            0            129,499
Walter E. Robb, III.......     0            0            148,624
Arnold D. Scott...........     0            0                  0
Jeffrey L. Shames.........     0            0                  0
J. Dale Sherratt..........     0            0            148,624
Ward Smith................     0            0            148,624
</TABLE>
 
- ---------------
 
(1) For the fiscal year ending August 31, 1996.
 
(2) Based upon normal retirement age (75).
 
(3) For calendar year 1995. The non-interested Trustees served as Trustees of 36
     funds within the MFS fund complex (having aggregate net assets at December
     31, 1995, of approximately $12.5 billion) while Mr. Bailey served as
     Trustee of 73 funds within the MFS fund complex (having aggregate net
     assets at December 31, 1995, of approximately $31.7 billion).
 
   
As of May 31, 1997, the Trustees and officers as a group owned less than 1% of
the Fund's shares, not including 111,814.3020 Class I shares of the Fund (which
represent approximately 75.40% of the outstanding shares of the Fund) owned of
record by certain employee benefit plans of MFS of which Messrs. Brodkin, Scott
and Shames are Trustees.
    
 
   
As of May 31, 1997, The First National Bank of Boston, Trustee for IRA R/O Ned
L. Rigsbee, Boston, MA, was the owner of approximately 53.68% of the outstanding
Class A shares of the Fund; Brian E. Stack and Margaret R. Stack, JTWROS, c/o
Massachusetts Financial Services, 500 Boylston Street, Boston, MA 02116-3740,
were the owners of approximately 26.26% of the outstanding Class A shares of the
Fund; Mary Ann Russell and Michael R. Russell, JTWROS c/o Massachusetts
Financial Services, 500 Boylston Street, Boston, MA 02116-3740, were
    
 
                                       16
<PAGE>   55
 
   
the owners of approximately 5.38% of the outstanding Class A Shares of the Fund;
and MFS Defined Contribution Plan c/o Mark Leary, Massachusetts Financial
Services, 500 Boylston Street, Boston, MA 02116-3740, was the owner of
approximately 99.99% of the outstanding Class I 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 determined 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 they 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").
    
 
   
INVESTMENT ADVISORY AGREEMENT -- The Adviser manages the Fund pursuant to an
Investment Advisory Agreement, dated October 30, 1997 (the "Advisory
Agreement"). Under the Advisory Agreement, the Adviser provides the Fund with
overall investment advisory services. Subject to such policies as the Trustees
may determine, the Adviser makes investment decisions for the Fund. For these
services and facilities, the Adviser receives an annual management fee, computed
and paid monthly, as disclosed in the Prospectus under the heading "Management
of the Funds."
    
 
For the period from the commencement of investment operations on January 2, 1996
to the Fund's fiscal year end of August 31, 1996, the Adviser waived its right
to receive management fees from the Fund.
 
The Adviser pays the compensation of the Trust's officers and of any Trustee who
is an officer of the Adviser. The Adviser 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 will remain in effect until October 30, 1999 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 Objective, Policies and 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 Objectives, Policies and Restrictions"), or by either party on not
more than 60 days' nor less than 30 days' written notice. The Advisory Agreement
provides that if MFS ceases to serve as the Adviser to the Fund, the Fund will
change its name so as to delete the initials "MFS" and that MFS may render
services to others and may permit other fund clients to use the initials "MFS"
in their names. The Advisory Agreement also provides that neither the Adviser
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.
    
 
   
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 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.
    
 
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 and dividends 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 of 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 an
Amended and Restated Shareholder Servicing Agreement dated January 2, 1996 (the
"Agency Agreement") with the Trust. 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 up to 0.13%. In addition, the Shareholder Servicing Agent will be
reimbursed by the Fund for
 
                                       17
<PAGE>   56
 
certain expenses incurred by the Shareholder Servicing Agent on behalf of the
Fund. The Custodian has contracted with the Shareholder Servicing Agent to
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 with the
Trust dated as of January 1, 1995 (the "Distribution Agreement").
 
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 a Class A share of the
Fund is calculated by dividing the 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" below).
 
Class A shares of the Fund may be sold at their net asset value to certain
persons and 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 the 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 5.00% and MFD retains approximately 3/4 of 1% of the public
offering price. MFD, on behalf of the Fund, 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, Class C and Class I shares of the Fund. The public offering price of
Class B, Class C and Class I shares is their net asset value next computed after
the sale (see "Purchases" in the Prospectus and the Prospectus supplement
pursuant to which Class I shares are offered).
 
   
GENERAL: Neither MFD nor dealers are permitted to delay placing orders to
benefit themselves by a price change. 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.
    
 
The Distribution Agreement will remain in effect until August 1, 1997 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 Objective, Policies and
Restrictions -- Investment Restrictions") 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.
 
4. PORTFOLIO TRANSACTIONS AND BROKERAGE
   COMMISSIONS
 
Specific decisions to purchase or sell securities for the Fund are made by
persons affiliated with the Adviser. Any such person may serve other clients of
the Adviser, or any subsidiary of the Adviser in a similar capacity. Changes in
the Fund's investments are reviewed by the Board of Trustees.
 
The primary consideration in placing portfolio security transactions is
execution at the most favorable prices. The Adviser has complete freedom as to
the markets in and broker-dealers through which it seeks this result. In the
U.S. and in some other countries debt securities are traded principally in the
over-the-counter market on a net basis through dealers acting for their own
account and not as brokers. In other countries both debt and equity securities
are traded on exchanges at fixed commission rates. The cost of securities
purchased from underwriters includes an underwriter's commission or concession,
and the prices at which securities are purchased and sold from and to dealers
include a dealer's mark-up or mark-down. The Adviser normally seeks to deal
directly with the primary market makers or on major exchanges unless, in its
opinion, better prices are available elsewhere. Subject to the requirement of
seeking execution at the best available price, securities may, as authorized by
the Advisory Agreement, be bought from or sold to dealers who have furnished
statistical, research and other information or services to the Adviser. At
present no arrangements for the recapture of commission payments are in effect.
 
Consistent with the foregoing primary consideration, the Rules of Fair Practice
of the National Association of Securities Dealers,
 
                                       18
<PAGE>   57
 
Inc. ("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.
 
Under the Advisory Agreement and as permitted by Section 28(e) of the Securities
Exchange Act of 1934, the Adviser may cause a Fund to pay a broker-dealer which
provides brokerage and research services to the Adviser, 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 the Adviser
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 their
respective overall responsibilities to the Fund or to their 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 investing in, purchasing or selling securities,
and the availability of securities or 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 the
Adviser, 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 the Adviser's other clients in part for providing advice as to the
availability of securities or 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 the Adviser 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 the
Adviser to allocate a total of $39,100 of commission business from the MFS Funds
to the Pershing Division of Donaldson Lufkin & Jenrette as consideration for the
annual renewal of certain publications provided by Lipper Analytical Services
Corporation (which provides information useful to the Trustees in reviewing the
relationship between the Fund and the Adviser).
 
The Adviser's investment management personnel attempt to evaluate the quality of
Research provided by brokers. The Adviser sometimes uses evaluations resulting
from this effort as a consideration in the selection of brokers to execute
portfolio transactions.
 
   
The management fee of the Adviser will not be reduced as a consequence of the
Adviser's receipt of brokerage and research service. To the extent the Fund's
portfolio transactions are used to obtain brokerage and research services, the
brokerage commissions paid by the Fund will exceed those that might otherwise be
paid for such portfolio transactions, or for such portfolio transactions and
research, by an amount which cannot be presently determined. Such services would
be useful and of value to the Adviser 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 the Adviser in carrying out its obligations
to the Fund. While such services are not expected to reduce the expenses of the
Adviser, the Adviser 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.
    
 
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 other cases, however, the Fund believes that its ability to
participate in volume transactions will produce better executions for the Fund.
 
5. 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 any class of 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
 
                                       19
<PAGE>   58
 
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
will also 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 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 MFS Fixed 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 $37,500 and purchases an additional $12,500 of Class A
shares of the Fund, the sales charge for the $12,500 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 that 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 subject to any 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 and Class C shares in any year pursuant to a
SWP generally are limited to 10% of the value of the account at the time of
establishment of the SWP. SWP payments are drawn from the proceeds of share
redemptions (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) any "Reinvested Shares"; (ii) to the extent necessary, any
"Free Amount"; 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
 
                                       20
<PAGE>   59
 
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 received in 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 the 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 groups; 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 participate in 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 (if available for sale). 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
transfer 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 for exchanges will be charged 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 the 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 holders of Class A shares of MFS Cash Reserve Fund in the case where shares
of such funds are acquired through direct purchase or
 
                                       21
<PAGE>   60
 
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 MFS Money Market Fund, MFS Government Money Market
Fund and 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 the initial purchase in the case of Class B shares
or 12 months of the initial purchase in the case 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 of the
same class 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 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 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. No more than five exchanges may be made in any
one Exchange Request by telephone. If the Exchange Request is received by the
Shareholder Servicing Agent prior to the close of regular trading on the
Exchange 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. 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 fund and consider the differences in
objectives and policies before making any exchange. 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 for shares acquired through direct
purchase and dividends reinvested prior to June 1, 1992) have the right to
exchange their shares for shares of the Fund, 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 all 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.
 
                                       22
<PAGE>   61
 
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.
 
An investor should consult with his tax Adviser 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 Section 401(a) or 403(b) recordkeeping program made
available by the Shareholder Servicing Agent.
 
6. 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 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 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 requirements imposed by the Code, it
is not expected that the Fund will be required to pay any federal income or
excise taxes, although the Fund's foreign-source income may be subject to
foreign withholding taxes. If the Fund should fail to qualify as a "regulated
investment company" in any year, the Fund would incur a regular corporate
federal income tax upon its taxable income and Fund distributions would
generally be taxable as ordinary dividend income to the shareholders.
    
 
   
Shareholders of the Fund normally 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 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 is normally eligible for the dividends received deduction for
corporations if the recipient otherwise qualifies for that deduction with
respect to its holding of Fund shares. Availability of the deduction for
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 reinvested in additional shares, are taxable to shareholders as long-
term capital gains without regard to the length of time shareholders have held
their shares. It is uncertain at this time whether all or any part of such
capital gains will be eligible to be taxed at a maximum rate below 28%. 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
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. 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;
individual shareholders realizing a long-term capital gain will be eligible for
reduced tax rates if the shares were held for more than 18 months. 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 ninety 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 that 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 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, Futures Contracts, Forward Contracts, short
sales "against the box," and Swaps and related transactions 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.
    
 
                                       23
<PAGE>   62
 
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 would 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 which could alter the effects of these rules. The Fund will limit its
activities in options, Futures Contracts, Forward Contracts, and swaps and
related transactions to the extent necessary to meet the requirements of
Subchapter M of the Code.
 
   
Special tax considerations apply with respect to foreign investments of the
Fund. Foreign exchange gains or losses realized by the Fund will generally be
treated as ordinary income and losses. Use of foreign currencies for non-hedging
purposes and investment by the Fund in certain "passive foreign investment
companies" may be limited in order to avoid a tax on the Fund. The Fund may
elect to mark to market any investments in "passive foreign investment
companies" on the last day of each taxable year. This election may cause the
Fund to recognize ordinary income prior to the receipt of cash payments with
respect to those investments; 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. Investment income received by the Fund
from foreign securities may be subject to foreign income taxes withheld at the
source; the Fund does not expect to be able to pass through to shareholders
foreign tax credits with respect to such foreign taxes. The United States has
entered into tax treaties with many foreign countries that may entitle the Fund
to a reduced rate of tax or an exemption from tax on such income; the Fund
intends to qualify for treaty reduced rates where available. It is not possible,
however, to determine the Fund's effective rate of foreign tax in advance since
the amount of the Fund's assets to be invested within various countries is not
known.
    
 
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 a rate of 30%. The Fund intends to
withhold U.S. federal income tax at the rate of 30% on dividends and other
payments 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 may also be
subject to tax under the laws of their own jurisdictions. 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 that have been subject to
30% withholding.
 
The Fund will not be required to pay Massachusetts income or excise taxes as
long as it qualifies as a regulated investment company under the Code.
 
7. 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 each
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 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 effect 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 or 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 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.
 
                                       24
<PAGE>   63
 
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 expense and
equipment.
 
   
During the period from the commencement of investment operations, January 2,
1996, to the fiscal year ended August 31, 1996, distribution and service fees
under the Distribution Plan were not imposed.
    
 
   
GENERAL: The Distribution Plan will remain in effect until August 1, 1997, 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.
    
 
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, the Exchange is open for trading every weekday except for the
following holidays (or the days on which they are observed): New Year's Day;
Presidents' Day; Martin Luther King Day; Good Friday; Memorial Day; Independence
Day; Labor Day; Thanksgiving Day and Christmas Day.) 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. Equity securities in the Fund's portfolio are
valued at the last sale price on the exchange on which they are primarily traded
or on the Nasdaq Stock Market system for unlisted national market issues, or at
the last quoted bid price for listed securities in which there were no sales
during the day or for unlisted securities not reported on the Nasdaq Stock
Market system. Bonds and other fixed income securities (other than short-term
obligations) of U.S. issuers 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 quoted
prices or exchange or over-the-counter prices, since such valuations are
believed to reflect more accurately the fair value of such securities. Forward
Contracts will be valued using a pricing model taking into consideration market
data from an external pricing source. Use of the pricing services has been
approved by the Board of Trustees. All other 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 (whether
domestic or foreign) 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 Stock Market 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. Short-term obligations 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 upon dealer supplied valuations. Portfolio investments
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.
    
 
Generally, trading in foreign securities is substantially completed each day at
various times prior to the close of regular trading on the Exchange.
Occasionally, events affecting the values of such securities may occur between
the times at which they are determined and the close of regular trading on the
Exchange which will not be reflected in the computation of the Fund's net asset
value unless the Trustees deem that such event would materially affect the net
asset value in which case an adjustment would be made.
 
All investments and assets are expressed in U.S. dollars based upon current
currency exchange rates. A share's net asset value
 
                                       25
<PAGE>   64
 
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 (5.75% maximum with respect to Class A shares) 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 class of 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 aggregate total rate of return for Class A shares of the Fund for the period
from January 2, 1997 (commencement of investment operations) to February 28,
1997 was -3.91% (including the effect of the sales charge) and 0.90% (without
the effect of the sales charge). Class B and Class C shares were not available
for sale during this period. The aggregate total rate of return for Class I
shares of the Fund during this period was 0.90%.
    
 
Total rate of return figures would have been lower if fee reductions were not in
place. These figures are not calculated on an annualized basis. The aggregate
total return represents a limited time frame and may not be indicative of future
performance.
 
YIELD: Any yield quotation for a class of shares of the Fund is based on the
annualized net investment income per share of that class for the 30-day period.
The yield for each class of the Fund is calculated by dividing the net
investment income allocated to that class earned during the period by the
maximum offering price per share of that class of the Fund on the last day of
the period. The resulting figure is then annualized. Net investment income per
share of a class is determined by dividing (i) the dividends and interest
allocated to that class during the period, minus accrued expense of that class
for the period by (ii) the average number of shares of the class entitled to
receive dividends during the period multiplied by the maximum offering price per
share on the last day of the period. The Fund's yield calculations assume a
maximum sales charge of 5.75% in the case of Class A shares and no payment of
any CDSC in the case of Class B and Class C shares.
 
   
CURRENT DISTRIBUTION RATE: Yield, which is calculated according to a formula
prescribed by the SEC, is not indicative of the amounts which were or will be
paid to the Fund's shareholders. Amounts paid to shareholders of each class are
reflected in the quoted "current distribution rate" for that class. The current
distribution rate for a class is computed by dividing the total amount of
dividends per share paid by the Fund to shareholders of that class during the
past 12 months by the maximum public offering price of that class at the end of
such period. Under certain circumstances, such as when there has been a change
in the amount of dividend payout, or a fundamental change in investment
policies, it might be appropriate to annualize the dividends paid over the
period such policies were in effect, rather than using the dividends during the
past 12 months. The current distribution rate differs from the yield computation
because it may include distributions to shareholders from sources other than
dividends and interest, such as premium income from option writing, short-term
capital gains and return of invested capital, and is calculated over a different
period of time. The Fund's current distribution rate calculation for Class A
shares assumes a maximum sales charge of 5.75%. The Fund's
    
 
                                       26
<PAGE>   65
 
current distribution rate calculation for Class B and Class C shares assumes no
CDSC is paid.
 
GENERAL: 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 and
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 similar or related matters.
 
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.
 
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: 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 Planning(sm) program, an intergenerational 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.
 
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 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.
 
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 in 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.
 
                                       27
<PAGE>   66
 
  -- 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(R) becomes money manager of MFS(R) Union Standard Trust, the
     first Trust to invest solely 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. DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES
 
The 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 of any series into a
greater or lesser number of shares without thereby changing the proportionate
beneficial interests in that series. The Trustees have currently authorized
shares of the Fund and thirteen other series. The Declaration of Trust further
authorizes the Trustees to classify or reclassify any series of shares 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, Class C and Class I
shares). Of the twelve other series of the Trust, all offer Class A and Class B
shares, eleven offer Class C shares and eleven offer 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, 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 shareholders. The
Trust reserves the right to create and issue a number of series and additional
classes of shares, in which case the shares of each class of a series would
participate equally in the earnings, dividends and assets allocable to that
class of the particular series.
 
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.
To the extent a shareholder of the Fund owns a controlling percentage of the
Fund's shares, such shareholder may affect the outcome of such matters to a
greater extent than other Fund shareholders (see "Description of Shares, Voting
Rights and Liabilities" in the Prospectus). Although Trustees are not elected
annually by the shareholders, the Declaration of Trust provides that a Trustee
may be removed from office at a meeting of shareholders by a vote of two-thirds
of the outstanding shares of the Trust. A meeting of shareholders will be called
upon the request of shareholders of record holding in the aggregate not less
than 10% of the outstanding voting securities of the Trust. No material
amendment may be made to the Declaration of Trust without the affirmative vote
of a majority of the Trust's outstanding shares (as defined in "Investment
Restrictions"). The Trust or any series of the Trust may be terminated (i) upon
the merger or consolidation of the Trust or any series of the Trust with another
organization or upon the sale of 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 the Trust's or the affected
series' outstanding shares voting as a single class, or of the affected series
of the Trust, 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 the
affected series' outstanding shares will be sufficient, or (ii) upon liquidation
and distribution of the assets of a Fund, if approved by the vote of the holders
of two-thirds of its outstanding shares of the Trust, or (iii) by the Trustees
by written notice to its shareholders. If not so terminated, the Trust 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 the Trust shall maintain appropriate insurance (for example,
fidelity bonding and errors and omissions insurance) for the protection of the
Trust and its shareholders and the Trustees, officers, employees and agents of
the Trust 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
Trust 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 his willful misfeasance, bad
faith, gross negligence, or reckless disregard of the duties involved in the
conduct of his office.
 
10. INDEPENDENT AUDITORS AND
     FINANCIAL STATEMENTS
 
Ernst & Young 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 unaudited Semiannual Report, consisting of the Portfolio of Investments at
February 28, 1997, the Statement of Assets and Liabilities at February 28, 1997,
the Statement of Operations for the period from the commencement of investment
operations
    
 
                                       28
<PAGE>   67
 
   
on January 2, 1997 to February 28, 1997, Statement of Changes in Net Assets for
the period from commencement of investment operations on January 2, 1997 to
February 28, 1997, and the Notes to the financial statements are incorporated
herein by reference to the Semiannual Report to shareholders filed with the SEC
on May 2, 1997.
    
 
                                       29
<PAGE>   68
   
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
Ernst & Young, LLP
200 Clarendon Street, Boston, MA 02116
    
 



   
MFS(R) NEW DISCOVERY FUND
    
 
500 BOYLSTON STREET
BOSTON, MA 02116
 
[MFS LOGO]
 
   
                                                                MND-13-11/97/500
    


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