MFS SERIES TRUST
DEFA14A, 1997-05-15
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                            SCHEDULE 14A INFORMATION


                  Proxy Statement Pursuant to Section 14(a) of the Securities
                           Exchange Act of 1934 (Amendment No. )


Filed by the Registrant |X|      Filed by a Party other than the Registrant |_|


Check the appropriate box:

|_| Preliminary Proxy Statement
|_| Definitive Proxy Statement
|X| Definitive Additional Materials
|_| Soliciting Material Pursuant to Section  240.14a-11(c) or Section 240.14a-12
|_| Confidential  for  Use  of  the  Commission  Only  (as  permitted  by  Rule
    14a-6(e)(2))


                              THE MFS SERIES TRUST
                (Name of Registrant as Specified in its Charter)

      (Name of Person(s) Filing Proxy Statement, if other than the Registrant)


Payment of Filing Fee (Check the appropriate box):

|X| No Fee required
|_| Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

     1)   Title of each class of securities to which transaction applies:

     2)   Aggregate number of securities to which transaction applies:

     3)   Per unit  price  or other  underlying  value of  transaction  computed
          pursuant to Exchange  Act Rule 0-11 (Set forth the amount on which the
          filing fee is calculated and state how it was determined):

     4)   Proposed maximum aggregate value of transaction:

     5)   Total fee paid:

|_| Fee paid previously with preliminary materials.

|_| Check box if any part of the fee is offset as provided by Exchange  Act Rule
    0-11(a)(2)  and  identify the filing for which the  offsetting  fee was paid
    previously.  Identify the previous filing by registration  statement number,
    or the Form or Schedule and the date of its filing.

     1)   Amount Previously Paid:

     2)   Form, Schedule or Registration Statement No.:

     3)   Filing Party:

     4)   Date Filed:
<PAGE>
                      MFS AGGRESSIVE SMALL CAP EQUITY FUND
                              500 Boylston Street
                          Boston, Massachusetts, 02116



                                            May 15, 1997


Dear Shareholder:

A special meeting of  shareholders of MFS Aggressive  Small Cap Equity Fund will
be held on May 23, 1997. This is a very important meeting.  As a shareholder you
are  being  asked  to  approve  your  Board  of  Trustees'  decision  to  retain
Massachusetts  Financial Services Company (MFS) as the new adviser of your fund.
Your Board of Trustees unanimously  recommends that you vote FOR this agreement.
Please  sign,  date  and  mail  today  the  WHITE  proxy  card  in the  enclosed
postage-paid envelope.


                                  WHO IS MFS?

MFS is America's oldest mutual fund organization  dating back to 1924, and as of
January 31,1997, has net assets under management of approximately $54 billion on
behalf of 2.3  million  investor  accounts.  Mr. John W.  Ballen,  a Senior Vice
President of MFS, is the  portfolio  manager for your fund.  Mr. Ballen has been
with MFS since 1984 and is its chief equity officer.

                                MFS PERFORMANCE

MFS' record  speaks for itself.  MFS  manages two other  mutual  funds like your
fund,  categorized  in the Lipper Small Company Growth Funds  universe.  MFS OTC
Fund (OTC) and MFS Emerging  Equities  Fund (MEE) have one year total returns of
19.4% and 19.5%,  respectively,  compared  to your fund's  performance  of 15.4%
under  Navellier.  This  performance is superior to the performance of your fund
under Navellier.  The two-year  cumulative  return for OTC and MEE was 46.0% and
71.8%, respectively,  compared to 66.2% for your fund under Navellier. All these
returns assume the reinvestment of distributions  but exclude the effects of any
sales charges.

                             MFS OFFERS LOWER COSTS

MFS has agreed to reduce your Fund's investment advisory and administrative fees
almost 50% (equal to a reduction of 73.5 basis points) as follows:

o    a 40%  reduction  in your  fund's  investment  advisory  fee from 125 basis
     points, the rate previously paid to Navellier, to 75 basis points.

o    a 94% reduction in your fund's administrative fee from 25 basis points, the
     rate previously paid to Navellier, to 1.5 basis points.

MFS is able to offer your Fund these  lower  fees while  providing  at least the
same level of service the Fund received from Navellier.  While past  performance
is not a guarantee of future  performance,  fee reductions  contribute to better
performance year after year.

                                DO NOT BE MISLED

As you may imagine,  Navellier is not happy by the actions of your Board. It may
threaten his business and his reputation.  Last year,  Navellier  earned fees of
approximately $2.6 million from your fund.

Please be assured that your Board takes its  responsibility  seriously.  We felt
compelled not to renew  Navellier as the fund's  adviser  because of Navellier's
repeated  failures to provide your Board with information as required by federal
securities laws and, ultimately, our loss of confidence in Navellier's operation
of the fund.

Navellier claims your Board acted without your approval.  Your Board is required
to act on your behalf, which we have done. And, we are now asking you to approve
our actions at the special shareholder meeting. DO NOT let Navellier mislead you
into thinking that we are trying to save our jobs. Our actions are NOT about job
security.  The real issue is our  responsibility  of  providing  you with a fund
manager with integrity and performance and at a lower cost.

Navellier  talks about a tax-free  merger.  Voting to approve MFS as your fund's
investment  adviser has NO tax  implications for you. Whether or not you approve
MFS as the  adviser,  the results of this meeting have NO impact on your ability
to consider a tax-free merger into  Navellier's  Performance  Funds or any other
mutual fund at a later date.


                             YOUR VOTE IS IMPORTANT

Your Board of  Trustees  believes  that the  agreement  with MFS is in your best
interest and urges you to vote FOR approval of this agreement.

Please  sign,  date  and  mail  today  the  WHITE  proxy  card  in the  enclosed
postage-paid envelope.

                                            Sincerely,


                                            DONALD A. SIMON
                                            Donald A. Simon
                                            Chairman of the Board


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