NAVELLIER SERIES FUND
PRES14A, 1997-04-10
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<PAGE>
                                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:

|X| Preliminary Proxy Statement
|_| Definitive Proxy Statement
|_| 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



                        Notice of Special Meeting of Shareholders
                                    To be held May 6, 1997


A Special Meeting of  Shareholders of MFS Aggressive  Small Cap Equity Fund (the
"Fund") will be held at 500 Boylston Street, Boston, Massachusetts,  on Tuesday,
May 6, 1997 at 9:30 a.m. for the following purposes:

ITEM 1.       To approve or disapprove an Investment  Advisory Agreement between
              Massachusetts  Financial Services Company ("MFS") and the Fund.

ITEM 2.       To transact such other business as may properly come before the
              Special Meeting of Shareholders and any adjournments thereof.

             Your Trustees  recommend  that you vote in favor of Item 1.

Only  shareholders  of record on April __,  1997 will be entitled to vote at the
Special Meeting of Shareholders and at any adjournments thereof.



                                                   STEPHEN E. CAVAN, SECRETARY


April 21, 1997






YOUR VOTE IS  IMPORTANT.  We would  appreciate  your promptly  voting,  signing,
dating  and  returning  the  enclosed  proxy,  which will help save the Fund the
necessary  and  additional  expense  of  a  second  solicitation.  The  enclosed
addressed envelope requires no postage and is provided for your convenience.


<PAGE>
                                 PROXY STATEMENT

This proxy statement is furnished in connection with the solicitation of proxies
by and on behalf of the Board of Trustees  (the "Board of  Trustees") of The MFS
Series  Trust (the  "Trust") on behalf of MFS  Aggressive  Small Cap Equity Fund
(the  "Fund"),  a  series  of the  Trust,  to be used at a  Special  Meeting  of
Shareholders to be held at 500 Boylston Street, Boston,  Massachusetts on May 6,
1997,  and at any  adjournments  thereof,  for the  purposes  set  forth  in the
accompanying Notice (collectively the "Special Meeting").

This Proxy  Statement,  the Notice of Special  Meeting of  Shareholders  and the
proxy card are being mailed to  shareholders  on or about April 21, 1997,  or as
soon as practicable  thereafter.  All properly executed proxies received in time
for the  Special  Meeting  will be voted as  specified  in the  proxy  or, if no
specification  is made,  in  favor  of the  proposal  referred  to in the  Proxy
Statement.  Any  shareholder  giving a proxy  has the power to revoke it by mail
(addressed to the Secretary of the Trust at its  principal  executive  office of
the Fund, 500 Boylston Street, Boston,  Massachusetts 02116) or in person at the
Special Meeting,  by executing a superseding  proxy or by submitting a notice of
revocation to the Fund.

Shareholders  of record  at the close of  business  on April __,  1997  ("Record
Date") will be entitled to one vote for each share held.  There were  __________
shares of the Fund outstanding on the Record Date.

For a free copy of the  Fund's  Annual  Report for its most  recently  completed
fiscal year ended December 31, 1996,  write or call the Fund's  transfer  agent,
Rushmore Trust and Saving FSB, at 4922 Fairmont Avenue, Bethesda, Maryland 20814
or (800) 621-7874.

ITEM 1 - TO APPROVE OR DISAPPROVE THE INVESTMENT  ADVISORY  AGREEMENT BETWEEN
MASSACHUSETTS  FINANCIAL SERVICES COMPANY AND THE FUND

BACKGROUND

At the Special  Meeting,  shareholders  of the Fund will be asked to approve the
Agreement.  MFS  acts as the  investment  adviser  to the  Fund  pursuant  to an
Investment  Advisory  Agreement  dated  March  16,  1997  between  Massachusetts
Financial Services Company, a Delaware corporation ("MFS" or the "Adviser"), and
the Fund.

Pursuant to the Agreement MFS provides the Fund with overall investment advisory
services,  as well as general office facilities.  Subject to such polices as the
Board of Trustees may determine,  MFS makes  investment  decisions for the Fund.
For its services and facilities, MFS receives an annual management fee under the
Agreement, computed and paid monthly, in an amount equal to 1.25% of the average
daily net assets of the Fund on an annualized basis.

                                       - 1 -
<PAGE>

If the Agreement is approved by  shareholders  at the Special  Meeting,  MFS has
agreed  that the  investment  management  fee paid by the Fund to MFS  under the
Agreement  would be reduced from 1.25% to 0.75% of the Fund's  average daily net
assets  on an  annualized  basis.  This  reduction  of 0.50%  constitutes  a 40%
reduction in the investment advisory fee rate. In addition,  if the Agreement is
approved by  shareholders at the Special  Meeting,  MFS has also agreed that the
fee  paid by the  Fund to MFS  under  the  term  of an  Administrative  Services
Agreement  would be reduced from 0.25% to 0.015% of the Fund's average daily net
assets on an  annualized  basis.  This  reduction  of 0.235%  constitutes  a 94%
reduction  in the  administrative  fee rate.  See the  information  below  under
"Effect of Reduction in Management  Fee." A description of the Agreement and the
services provided by MFS thereunder is set forth below.

In approving the Agreement and recommending  its approval by  shareholders,  the
Trustees considered the best interests of the shareholders of the Fund, and took
into account all such factors as they deemed  relevant.  See "Review  Process of
the Board of Trustees" below.

The Board of  Trustees  unanimously  recommends  that  shareholders  of the Fund
approve the Investment Advisory Agreement with MFS.

The Agreement was most recently  approved by the Board of Trustees,  including a
majority of the  Trustees  who are not  "interested  persons," as defined in the
Investment Company Act of 1940, as amended (the "1940 Act"), (collectively,  the
"Independent  Trustees"),  on March 13, 1997. On this date,  MFS was retained by
the Fund to serve as its investment  adviser under the Agreement and pursuant to
Rule 15a-4 under the 1940 Act  following  the  decision  not to renew the Fund's
advisory  agreement  and other  arrangements  with  Navellier  Management,  Inc.
("NMI")  and  its  affiliates.   NMI  had  served  as  the  Fund's  adviser  and
administrator,   and  an  affiliate  of  NMI  served  as  the  Fund's  principal
underwriter, from the Fund's inception through March 15, 1997.

Rule 15a-4 is designed to permit funds to secure the  services of an  investment
adviser, like MFS, under certain extraordinary circumstances, subject to certain
conditions.  Rule 15a-4  allows new  investment  advisers  to be retained in the
event that the  agreement  between the fund's prior  investment  adviser and the
fund has been  terminated  by generally  unforeseen  events or by the failure to
renew this agreement.  Under this rule, the new investment  adviser to a fund is
permitted to serve the fund under an investment  advisory agreement that has not
yet been approved by  shareholders if (i) the agreement has been approved by the
funds' governing board as specified in the 1940 Act, (ii) the compensation to be
received by the new investment  adviser does not exceed the compensation paid to
the  former  investment  adviser,   and  (iii)  the  agreement  is  approved  by
shareholders  within the 120 day period  following the  termination of the prior
agreement.  MFS has been retained as the Fund's investment adviser in accordance
with Rule 15a-4 and the purpose of this Special  Meeting is to ask  shareholders
to approve the Agreement.

                                       - 2 -
<PAGE>
On March 13, 1997,  MFS also was  retained to serve as the Fund's  administrator
under an agreement  having the same terms,  provisions and fees as the agreement
under  which  NMI  previously  had  acted  as  the  Fund's  administrator.   The
administrative  agreement with MFS, like the prior agreement with NMI,  provides
for a fee paid by the Fund to MFS equal to 0.25% per annum of the Fund's average
daily net  assets.  MFS has  informed  the Fund that it will  reduce the fee for
providing  such  administrative  services  to the Fund  from  0.25% per annum to
0.015% per annum if shareholders  approve the Agreement at the Special  Meeting.
This reduction of 0.235%  constitutes a 94% reduction in the  administrative fee
rate.

On this date, a subsidiary  of MFS, MFS Fund  Distributors,  Inc.  ("MFD"),  was
retained as the Fund's principal underwriter under a Distribution Agreement with
the Fund.

EFFECT OF REDUCTION IN MANAGEMENT FEE

The effect of MFS'  proposal to reduce its  management  fee under the  Agreement
from 1.25% to 0.75%, and its  administrative fee from 0.25% to 0.015%, per annum
of the  Fund's  average  daily  net  assets  if the  Agreement  is  approved  by
shareholders at the Special Meeting is set forth below.  This information  shows
what the Fund's management fee and administrative fee ratios would have been for
the most recent fiscal year if these proposed  reduced fees being offered by MFS
had been in effect,  based on  average  net  assets of the Fund  during  1996 of
$185,895,200.

                           12 months ended December 31, 1996

                         % of Average                                 % Change
                         Daily Net Assets      Amount of Fee        (Reduction)

Management Fee
     Present Fee            1.25%              $2,323,690
     Proposed Fee           0.75%               1,394,214
                            ------             -----------
     Difference            (0.50%)             $   929,476           (40.00%)

Administrative Fee
     Present Fee            0.25%              $464,738
     Proposed Fee           0.015%               27,884
                            -------           ----------
     Difference            (0.235%)            $436,854              (94.00%)


Shown below is a  comparison  between all  expenses  and fees the Fund  incurred
during its fiscal year ended  December 31,  1996,  and the fees and expenses the
Fund would have incurred if the proposed reduced  management and  administrative
fees being  offered by MFS if the  Agreement is approved at the Special  Meeting
had been in effect.
                                       - 3 -
<PAGE>
Shareholder Transaction Expenses
         Maximum Sales Load Imposed on Purchases..........3%
           (as a percentage of offering price)
         Maximum Sales Load Imposed on Reinvested
           Dividends......................................None
         Redemption Fees..................................None

Annual Fund Operating Expenses (as a percentage of average net assets)
                                                          Current      Proposed
         Management Fees...................................1.25%         0.750%
         Administrative Fee................................0.25%         0.015%
         Other Expenses (after expense limitation)1........0.25%         0.360%
         Total Fund Operating Expenses (after expense
           limitation)1....................................1.75%         1.125%


1 MFS has agreed to bear the Fund's normal  operating  expenses  which accrue on
and after March 16, 1997, subject to reimbursement by the Fund, such that "Total
Fund  Operating  Expenses" do not exceed  1.75% per annum of the Fund's  average
daily net assets during the current fiscal year. If this arrangement had been in
place for the Fund's fiscal year ended December 31, 1996,  "Other  Expenses" and
"Total Fund  Operating  Expenses" are estimated to be 0.36% and 1.86% per annum,
respectively.


Examples:  The following example indicates both for the current fee schedule and
the proposed fee schedule,  the direct and indirect  expenses an investor  could
expect  to incur in a  one-year,  three-year,  five-year  and  ten-year  period,
respectively:

                   1 year       3 years      5 years      10 years
Current            $47          $83          $122         $230
Proposed           $41          $65          $ 90         $163

The foregoing example is for illustration only and assumes: (a) that an investor
maintains an average of $1,000  invested in the Fund; (b) payment of the maximum
3% sales load; (c) a 5% annual return;  (d) percentage  amounts listed above for
Annual Fund Operating  Expenses  remain  constant (for all periods shown above);
and (e) reinvestment of all dividends and distributions.  Actual expenses may be
more or less than shown.

FEES OF SIMILAR MFS FUNDS

MFS  also  acts as the  investment  adviser  to  several  registered  investment
companies having similar  investment  objectives and/or policies to those of the
Fund.
                                       - 4 -
<PAGE>
The  following  table  sets  forth the name of each  investment  company  having
similar  investment  objectives  and/or policies to the Fund, the annual rate of
compensation  (i.e., the fee MFS is paid for its services as investment  adviser
to such funds) and the net assets as of December 31, 1996.

                                                           Annual       Fees
       Name                Investment                     Rate of     Waived or
      of Fund               Objective      Net Assets   Compensation   Reduced

MFS Capital Growth Fund   Capital Growth   $581,529,676   0.75%           NO

MFS Emerging Growth Fund  Capital Growth $6,119,734,374   0.75% first     NO
                                                           2.5 billion

                                                          0.70% over
                                                           2.5 billion

MFS Strategic Growth      Capital           $12,070,633   0.75%           NO
Fund                      Appreciation

MFS OTC Fund              Capital Growth   $120,766,345   0.75%           NO

MFS Institutional         Capital Growth   $306,574,929   0.75%           NO
Emerging Equities Fund

MFS  provides  administrative  services  to  these  funds  under  the  terms  of
administrative services agreements providing for a maximum fee equal to 0.015%.

INVESTMENT ADVISER

MFS is  America's  oldest  mutual  fund  organization.  MFS and its  predecessor
organizations  have a  history  of money  management  dating  from  1924 and the
founding of the first mutual fund in the United States,  Massachusetts Investors
Trust.   Net  assets  under  the  management  of  the  MFS   organization   were
approximately  $52.1 billion on behalf of over 2.2 million investor  accounts as
of December  31,  1996.  MFS is a subsidiary  of Sun Life  Assurance  Company of
Canada  (U.S.)  ("Sun Life of Canada  (U.S.)")  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,  John D.  McNeil,  Donald A.
Stewart and Arnold D. Scott.  Mr.  Brodkin is the  Chairman,  Mr.  Shames is the
President and Mr. Scott is the Secretary and a Senior  Executive  Vice President
of MFS.  Messrs.  McNeil  and  Stewart  are  the  Chairman  and  the  President,
respectively,  of Sun Life. The address of Messrs.  Brodkin, Scott and Shames is
500 Boylston Street, Boston,  Massachusetts 02116. The address of Messrs. McNeil
and Stewart is 150 King Street West, Toronto, Canada M5H 1J9. Sun Life, a mutual
life  insurance  company,  is one of the largest  international  life  insurance
companies and has been operating in the United States since 1895, establishing a
headquarters  office here in 1973.  The executive  officers of MFS report to the
Chairman of Sun Life.

                                       - 5 -
<PAGE>

James R. Bordewick,  Jr.,  Stephen E. Cavan, W. Thomas London and James O. Yost,
all of whom are officers of MFS, are also officers of the Trust.

MFS also serves as investment adviser to over 100 other funds, including the MFS
Family of Funds (the "MFS Funds"),  MFS Municipal  Income Trust, MFS Multimarket
Income Trust,  MFS Government  Markets  Income Trust,  MFS  Intermediate  Income
Trust,  MFS Charter  Income Trust,  MFS Special Value Trust,  MFS  Institutional
Trust,  MFS Union Standard 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 of Canada (U.S.) in connection with
the sales of various fixed/variable annuity contracts.  MFS and its wholly owned
subsidiary,  MFS Institutional Advisors, Inc., also provide investment advice to
substantial private clients.

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

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

The address of MFS and MFD is 500 Boylston Street, Boston, Massachusetts 02116.

REVIEW PROCESS OF THE BOARD OF TRUSTEES

The Board of Trustees  discussed  approval of the Agreement at a meeting held on
March 13, 1997.  In evaluating  the  Agreement,  the Board of Trustees  reviewed
materials furnished by MFS. At the Board of Trustees meeting, representatives of
MFS  discussed  MFS'  philosophy of  management,  performance  expectations  and
methods of operation insofar as they related to the Fund.

                                       - 6 -
<PAGE>
In approving the Agreement and recommending  its approval by  shareholders,  the
Trustees,  considering the best interests of the  shareholders of the Fund, took
into account all such factors as they deemed  relevant.  Among such factors were
the nature, quality and extent of the services furnished by MFS to the Fund; the
advantages and possible disadvantages to the Fund of having a manager which also
serves other investment companies and private accounts; the investment record of
MFS;  possible  economies of scale;  comparative  data as to advisory  fees; the
risks assumed by MFS;  possible  benefits to MFS from serving as manager to, and
of an affiliate of MFS serving as principal  underwriter  of, the Fund;  current
and  developing  conditions in the financial  services  industry,  including the
entry into the industry of large and highly  capitalized  companies which spend,
and appear to be  prepared  to  continue  to spend,  substantial  sums to engage
personnel  and to  provide  services  to  competing  investment  companies;  the
financial   resources  of  MFS;  the   importance  of  obtaining   high  quality
professional services for the Fund; and various other factors.

In addition, in a press release and a communication sent to Fund shareholders on
March 13, 1997, the  Independent  Trustees stated that their decision to replace
NMI and its affiliates  with MFS and its affiliates was based on the totality of
the facts and circumstances.  They also stated that they had determined that MFS
and MFD would be able to provide  superior  levels of support and service to the
Fund and its  shareholders and that they were  particularly  impressed with MFS'
professionalism  and its  demonstrated  record of strong  performance,  investor
service and management.

The  Board  of  Trustees  also  considered  the  background  and  experience  of
representatives  of MFS who were  elected as  officers of the Trust on March 13,
1997, as well as of John W. Ballen, the Fund's portfolio manager.

The  Independent  Trustees'  decision  not  to  renew  the  investment  advisory
agreement and other arrangements with NMI and its affiliates was based primarily
upon:  (i) NMI's  repeated  failure to provide  the  Independent  Trustees  with
information  that (1) the  Independent  Trustees had requested as required under
applicable  federal  securities laws and state business trust and other laws and
(2) was reasonably  necessary to evaluate (a) the  continuation  of the existing
investment advisory,  administrative  services and distribution  agreements with
NMI and its affiliates,  and (b) proposal by NMI to cause the assets of the Fund
to be  reorganized  into another  fund managed by NMI; and (ii) the  Independent
Trustees' lack of confidence, ultimately, in the operation of the Fund by NMI.

In  connection  with its  decision  not to renew  the  Fund's  prior  investment
advisory  agreement and other  arrangements with NMI and its affiliates,  and to
retain  MFS  and  its  affiliates  to  act  as the  Fund's  investment  adviser,
administrator  and  principal   underwriter,   the  Independent  Trustees,   who
constitute a majority of the Board of Trustees as required by the 1940 Act, have
indicated  their intention not to remain as trustees  indefinitely.  Independent
Trustees  currently  expect  to resign as  Trustees  of

                                       - 7 -
<PAGE>
the Trust no later than eighteen months  following the Special  Meeting.  In the
case of such resignations,  it currently is expected that certain members of the
various boards of trustees who oversee the various MFS Funds would be considered
to fill the vacancies  created by the  resignations  of the current  Independent
Trustees.  The Fund would be required to hold a meeting of shareholders to elect
these new trustees.

Based on its review,  the Board of Trustees,  including  all of the  Independent
Trustees, approved the Agreement with MFS.

DESCRIPTION OF THE INVESTMENT ADVISORY AGREEMENT

Under the Agreement,  MFS provides portfolio  management  services for the Fund,
including investment  research,  advice and supervision.  For its services,  the
Fund currently pays MFS a management fee computed and paid monthly, in an amount
equal to 1.25% per annum of the average  daily net asset  value of the Fund.  If
shareholders  approve the Agreement at the Special Meeting, MFS will immediately
reduce the  investment  advisory fee from 1.25% to 0.75% per annum of the Fund's
average daily net assets.

The  Fund  pays  its  expenses  (other  than  those  assumed  by MFS or MFS Fund
Distributors  Inc.,  the  Fund's  principal  underwriter  ("MFD")),   including:
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;
expenses of  preparing,  printing and mailing  share  certificates,  shareholder
reports,  notices,  proxy  statements and reports 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 Rushmore  Trust and Savings FSB, the Fund's  Custodian  and
Transfer Agent, 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  for such
purposes are borne by the Fund except that its Distribution  Agreement with MFD,
the Fund's principal underwriter,  required MFS to pay for prospectuses that are
to be used for sales purposes.

MFS pays the  compensation  of the Trust's  officers who are affiliated with MFS
and any Trustee who is an officer of MFS. 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 securities, and, in general, administering its affairs.

                                       - 8 -
<PAGE>
The Agreement provides that in the absence of willful misfeasance,  bad faith or
gross negligence,  MFS shall not be liable for any act or omission in the course
of, or in connection with, the rendering of its services thereunder.

The Agreement  will remain in effect  pursuant to its terms in  accordance  with
Rule 15a-4 under the 1940 Act until July 14, 1997; if approved by  shareholders,
the  Agreement  will then  remain in effect  pursuant  to its  terms,  except to
reflect that MFS will reduce its management fee to 0.75% from 1.25%, until March
14, 1999, and thereafter with respect to the Fund for successive  periods if and
so long as such  continuation is specifically  approved at least annually by (a)
the Board of Trustees or (b) the affirmative vote of the lesser of (1) more than
fifty percent  (50%) of the  outstanding  shares of the Fund or (2)  sixty-seven
percent  (67%) or more of the shares of the Fund  present at the meeting if more
than fifty percent (50%) of the  outstanding  shares of the Fund are represented
at the  meeting  in person or by proxy (a  "Majority  Vote"),  provided  that in
either event the continuation  also is approved by a majority of the Independent
Trustees by a vote cast in person at a meeting  called for the purpose of voting
on such approval. The Agreement is terminable,  without penalty, by the Board of
Trustees, by a Majority Vote of the Fund's shareholders, by MFS, in each case on
not more than sixty nor less than thirty days' written notice to the other party
and to the Fund.  The  Agreement  terminates  automatically  in the event of its
assignment (as defined in the 1940 Act).

The  description  of the  Agreement is qualified in its entirety by reference to
the Agreement which is attached as Appendix A in this proxy statement.


REQUIRED VOTE

Approval of the Agreement  requires a Majority  Vote of the Fund's  shareholders
(as defined above).

If for any reason the Agreement  between MFS and the Fund is not approved at the
Special  Meeting,  MFS has  informed  the  Board of  Trustees  that MFS will not
continue to serve as the Fund's investment  adviser after July 14, 1997. In such
event,  the Board of Trustees  will  consider  such other  arrangements  for the
management  of the  Fund as they  consider  to be in the best  interests  of the
shareholders of the Fund.

The Board of Trustees  unanimously  recommends  that the  shareholders  vote FOR
approval of the Agreement with MFS.

MANNER OF VOTING PROXIES

All proxies received by the management will be voted on all matters presented at
the Special Meeting and at any adjournments  thereof,  and if not limited to the
contrary, will be voted FOR Item 1.

                                       - 9 -
<PAGE>
Broker-dealer  firms  holding  Fund  shares in "street  name" for the benefit of
their customers and clients will request the  instructions of such customers and
clients  on how to vote  their  shares  on Item 1 before  the  Special  Meeting.
Proxies  which are  returned but which are marked  "abstain"  will be counted as
present for the purposes of a quorum.  However,  abstentions will not be counted
as votes cast. Abstentions will have the same effect as a vote against Item 1.

The  management  knows of no other  matters  to be brought  before  the  Special
Meeting.  If, however, any other matters come before the Special Meeting and any
adjournments thereof, it is the management's  intention that proxies not limited
to the  contrary  will be voted in  accordance  with the judgment of the persons
named in the enclosed form of proxy.

SUBMISSION OF CERTAIN PROPOSALS

The Trust is a Delaware  business  trust,  and as such is not  required  to hold
annual meetings of shareholders.  However,  meetings of shareholders may be held
from  time to time to  consider  such  matters  as the  approval  of  investment
management agreements or changes in certain investment  restrictions.  Proposals
of  shareholders  which are  intended to be  presented  at future  shareholder's
meetings  must be received by the Trust a  reasonable  time prior to the Trust's
solicitation of proxies relating to such future meeting.


ADDITIONAL INFORMATION

The  information  contained  in this proxy  statement  relating  to MFS has been
furnished by MFS.

To obtain the necessary representation at the Special Meeting, solicitations may
be made by mail, telephone, or interview by Georgeson & Company ("Georgeson") or
its agents as well as by officers of the Fund,  employees of MFS and  securities
dealers by whom shares of the Fund have been sold.  It is  anticipated  that the
total cost of any such solicitations,  if made by Georgeson or its agents, would
be approximately $[20,000] plus out-of-pocket expenses, and if made by any other
party, would be nominal.

In the event that  sufficient  votes in favor of the  proposal  set forth in the
Notice of Special  Meeting are not received by May 6, 1997, the persons named as
appointed   proxies  on  the  enclosed  proxy  card  may  propose  one  or  more
adjournments of the Special  Meeting to permit further  solicitation of proxies.
Any such  adjournment  will  require  the  affirmative  vote of the holders of a
majority  of the  shares  present  in person or by proxy at the  session  of the
meeting to be adjourned.  The persons named as appointed proxies on the enclosed
proxy card will vote in favor of the proposal for which

                                       - 10 -
<PAGE>
further  solicitation  of proxies is to be made. They will vote against any such
adjournment those proxies required to be voted against such proposal.  The costs
of any such additional  solicitation and of any adjourned  session will by borne
by the Fund.

The expense of solicitations as well as the preparation, printing and mailing of
the enclosed form of proxy, and this Proxy Statement, will be borne by the Fund.
The Fund will  reimburse  banks,  brokers and other  persons  holding the Fund's
shares  registered in their names or in the names of their  nominees,  for their
expenses  incurred in sending proxy  material to and obtaining  proxies from the
beneficial owners of such shares.

                   IT IS IMPORTANT THAT PROXIES BE RETURNED PROMPTLY






April 21, 1997                            MFS Aggressive Small Cap Equity Fund

















                                       - 11 -
<PAGE>
                                                                    APPENDIX A

 Note:  Bracketed material in Article 3 reflects the reduced investment advisory
 fee under which MFS has agreed to serve if the Agreement is approved by
 shareholders at the Special Meeting.


                          INVESTMENT ADVISORY AGREEMENT


         INVESTMENT ADVISORY  AGREEMENT,  dated this 16th day of March, 1997, by
and between THE MFS SERIES TRUST, a business trust  organized  under the laws of
the State of Delaware (the "Trust"),  on behalf of the MFS AGGRESSIVE  SMALL CAP
EQUITY FUND (the "Fund"),  a series of the Trust,  and  MASSACHUSETTS  FINANCIAL
SERVICES COMPANY, a Delaware corporation (the "Adviser").

                                   WITNESSETH:

         WHEREAS,  the Trust is engaged in business  as an  open-end  investment
company registered under the Investment Company Act of 1940; and

         WHEREAS,  the  Adviser is willing to provide  business services to the
Fund on the terms and  conditions hereinafter set forth;

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
of the parties  hereto as herein set forth,  the parties  covenant  and agree as
follows:

         Article 1. Duties of the Adviser.  The Adviser  shall  provide the Fund
with such investment  advice and supervision as the latter may from time to time
consider  necessary for the proper  supervision of its funds.  The Adviser shall
act as Adviser to the Fund and as such shall furnish  continuously an investment
program  and  shall  determine  from  time  to time  what  securities  shall  be
purchased, sold or exchanged and what portion of the assets of the Fund shall be
held uninvested,  subject always to the restrictions of the Declaration of Trust
of the Trust and By-Laws,  each as amended from time to time (respectively,  the
"Declaration"  and the "By-Laws"),  to the provisions of the Investment  Company
Act of 1940 and the Rules,  Regulations and orders  thereunder and to the Fund's
then-current  Prospectus  and Statement of Additional  Information.  The Adviser
shall also make recommendations as to the manner in which voting rights,  rights
to consent to  corporate  action and any other rights  pertaining  to the Fund's
portfolio  securities  shall  be  exercised.  Should  the  Trustees  at any time
however, make any definite  determination as to the investment policy and notify
the Adviser thereof in writing, the Adviser shall be bound by such determination
for the period,  if any,  specified in such notice or until  similarly  notified
that such determination  shall be revoked.  The Adviser shall take, on behalf of
the Fund,  all actions  which it deems  necessary  to implement  the  investment
policies determined as provided above, and in

                                       A-1
<PAGE>
particular to place all orders for the purchase or sale of portfolio  securities
for the Fund's account with brokers or dealers  selected by it, and to that end,
the Adviser is authorized as the agent of the Fund to give  instructions  to the
Custodian of the Fund as to the  deliveries of  securities  and payments of cash
for the account of the Fund. In connection with the selection of such brokers or
dealers and the placing of such orders,  the Adviser is directed to seek for the
Fund execution at the most  reasonable  price by responsible  brokerage firms at
reasonably  competitive  commission  rates. In fulfilling  this  requirement the
Adviser  shall not be deemed to have acted  unlawfully  or to have  breached any
duty,  created by this  Agreement or  otherwise,  solely by reason of its having
caused the Fund to pay a broker or dealer an amount of commission  for effecting
a securities transaction in excess of the amount of commission another broker or
dealer  would have  charged  for  effecting  that  transaction,  if the  Adviser
determined  in good faith  that such  amount of  commission  was  reasonable  in
relation to the value of the  brokerage and research  services  provided by such
broker or dealer,  viewed in terms of either that particular  transaction or the
Adviser's overall responsibilities with respect to the Fund and to other clients
of the Adviser as to which the Adviser exercises investment discretion.

         Article 2.  Allocation  of Charges  and  Expenses.  The  Adviser  shall
furnish at its own expense  investment  advisory  and  administrative  services,
office  space,  equipment  and clerical  personnel  necessary  for servicing the
investments  of the  Fund  and  maintaining  its  organization,  and  investment
advisory  facilities  and executive and  supervisory  personnel for managing the
investments  and effecting the portfolio  transactions  of the Fund. The Adviser
shall arrange, if desired by the Trust, for Directors, officers and employees of
the  Adviser  to serve as  Trustees,  officers  or  agents  of the Trust if duly
elected or appointed to such positions and subject to their  individual  consent
and to any  limitations  imposed by law. It is understood that the Fund will pay
all of its own expenses including, without limitation,  compensation of Trustees
"not affiliated" with the Adviser;  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  stock  certificates,  shareholder  reports,
notices,  proxy statements and reports 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 the 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; expenses of shareholders'
meetings; and expenses relating to the issuance,  registration and qualification
of shares of the Fund and the preparation,  printing and mailing of prospectuses
for such purposes (except to the extent that any Distribution Agreement to which
the Trust is a party on behalf of the Fund provides that another party is to pay
some or all of such expenses).

                                       A-2
<PAGE>
         Article 3. Compensation of the Adviser. For the services to be rendered
and the  facilities  to be  provided,  the  Fund  shall  pay to the  Adviser  an
investment  advisory  fee  computed  and paid monthly at an annual rate of 1.25%
[0.75%] of the Fund's average daily net assets for its then-current fiscal year.
If the Adviser  shall serve for less than the whole of any period  specified  in
this Section 3, the compensation  (including the expense  reimbursement) payable
to the Adviser with respect to the Fund will be prorated.

         Article 4. Special Services.  Should the Trust have occasion to request
the  Adviser  to perform  services  not herein  contemplated  or to request  the
Adviser to arrange  for the  services of others,  the  Adviser  will act for the
Trust on  behalf  of the Fund  upon  request  to the best of its  ability,  with
compensation  for the Adviser's  services to be agreed upon with respect to each
such occasion as it arises.

         Article 5.  Covenants of the Adviser.  The Adviser  agrees that it will
not deal with itself, or with the Trustees of the Trust or the Trust's principal
underwriter, if any, as principals in making purchases or sales of securities or
other  property  for  the  account  of the  Fund,  except  as  permitted  by the
Investment Company Act of 1940 and the Rules,  Regulations or orders thereunder,
will not take a long or short  position  in the  shares  of the Fund  except  as
permitted by the  Declaration,  and will comply with all other provisions of the
Declaration  and the By-Laws and the  then-current  Prospectus  and Statement of
Additional Information of the Fund relative to the Adviser and its Directors and
officers.

         Article 6.  Limitation  of Liability of the Adviser.  The Adviser shall
not 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 duties and obligations  hereunder.  As used
in this Article 6, the term  "Adviser"  shall  include  Directors,  officers and
employees of the Adviser as well as that corporation itself.

         Article 7.  Activities  of the Adviser.  The services of the Adviser to
the Fund are not  deemed  to be  exclusive,  the  Adviser  being  free to render
investment  advisory  and/or  other  services to others.  The Adviser may permit
other fund  clients to use the initials  "MFS" in their  names.  The Fund agrees
that if the Adviser  shall for any reason no longer serve as the Adviser for the
Fund,  the Fund will change its name so as to delete the initials  "MFS".  It is
understood that the Trustees,  officers and shareholders of the Trust are or may
be or become interested in the Adviser, as Directors,  officers,  employees,  or
otherwise and that  Directors,  officers and employees of the Adviser are or may
become  similarly  interested in the Fund, and that the Adviser may be or become
interested in the Fund as a shareholder or otherwise.

         Article 8. Duration,  Termination and Amendment of this Agreement. This
Agreement  shall  become  effective  on the date first  above  written and shall
govern the

                                       A-3
<PAGE>
relations between the parties hereto thereafter, and shall remain in force after
July 16,  1997,  only if  approved  prior to that date by "vote of a majority of
outstanding  voting  securities"  of the Fund, in which event it shall remain in
force  until  March  16,  1999,  on  which  date it will  terminate  unless  its
continuance  after March 16, 1999 is  "specifically  approved at least annually"
(i) by the  vote  of a  majority  of the  Trustees  of the  Trust  who  are  not
"interested  persons" of the Trust or of the  Adviser at a meeting  specifically
called  for the  purpose  of voting on such  approval,  and (ii) by the Board of
Trustees  of the Trust,  or by "vote of a  majority  of the  outstanding  voting
securities" of the Fund.

         This Agreement may be terminated at any time without the payment of any
penalty by the  Trustees  or by "vote of a majority  of the  outstanding  voting
securities" of the Fund, or by the Adviser,  in each case on not more than sixty
days' nor less than  thirty  days'  written  notice  to the  other  party.  This
Agreement shall automatically terminate in the event of its "assignment."

         This  Agreement  may be amended  only if such  agreement is approved by
"vote of a majority of the outstanding voting securities" of the Fund.

         The  terms  "specifically  approved  at  least  annually",  "vote  of a
majority  of  the  outstanding  voting  securities",  "assignment",  "affiliated
person",  and "interested person",  when used in this Agreement,  shall have the
respective  meanings  specified,  and shall be construed in a manner  consistent
with,  the  Investment  Company  Act of  1940  and  the  Rules  and  Regulations
promulgated thereunder,  subject,  however, to such exemptions as may be granted
by the Securities and Exchange Commission under said Act.














                                       A-4
<PAGE>
         IN WITNESS  WHEREOF,  the  parties  have caused  this  Agreement  to be
executed and  delivered  in their names and on their behalf by the  undersigned,
thereunto duly authorized,  and their respective seals to be hereto affixed, all
as of the day and year first written above. The undersigned Trustee of the Trust
has  executed  this  Agreement  not  individually,  but  as  Trustee  under  the
Declaration  and the  obligations  of this Agreement are not binding upon any of
the Trustees or shareholders of the Trust, individually, but bind only the trust
estate applicable to the Fund.

                                       THE MFS SERIES TRUST, on
                                         behalf of the MFS
                                         AGGRESSIVE SMALL CAP
                                         EQUITY FUND



                                       By: /s/Stephen E. Cavan
                                              Stephen E. Cavan, as
                                              Secretary and not individually


                                       MASSACHUSETTS FINANCIAL
                                         SERVICES COMPANY



                                       By: /s/ A. Keith Brodkin
                                               A. Keith Brodkin
                                               Chairman















                                       A-5
<PAGE>
     THIS PROXY IS SOLICITED BY AND ON BEHALF OF THE BOARD OF TRUSTEES OF
                     MFS(R) AGGRESSIVE SMALL CAP EQUITY FUND
           Proxy for the Special Meeting of Shareholders, May 6, 1997.

The undersigned  hereby appoints JAMES R. BORDEWICK,  JR.,  STEPHEN E. CAVAN, W.
THOMAS LONDON, AND ARNOLD D. SCOTT and each of them, proxies with several powers
of  substitution,  to  vote  for  the  undersigned  at the  Special  Meeting  of
Shareholders of MFS AGGRESSIVE SMALL CAP EQUITY FUND, to be held at 500 Boylston
Street, Boston, Massachusetts,  on Tuesday, May 6, 1997, notice of which meeting
and the  Proxy  Statement  accompanying  the  same  have  been  received  by the
undersigned,  or at any  adjournment  thereof,  upon the  following  matters  as
described in the Notice of Meeting and accompanying Proxy Statement.

WHEN PROPERLY  EXECUTED,  THIS PROXY WILL BE VOTED IN THE MANNER DIRECTED HEREIN
BY THE UNDERSIGNED SHAREHOLDER.  ALL PROPOSALS (SET FORTH ON THE REVERSE OF THIS
PROXY CARD) HAVE BEEN  PROPOSED BY THE BOARD OF  TRUSTEES.  IF NO  DIRECTION  IS
GIVEN ON THESE PROPOSALS,  THIS PROXY CARD WILL BE VOTED "FOR" ITEM 1. THE PROXY
WILL BE VOTED IN  ACCORDANCE  WITH THE  HOLDER'S  BEST  JUDGMENT AS TO ANY OTHER
MATTER.



   PLEASE VOTE AND SIGN ON OTHER SIDE AND RETURN PROMPTLY IN ENCLOSED ENVELOPE.

Please sign this proxy  exactly as your name appears on the reverse side of this
card. Joint owners should each sign personally.  Trustees and other  fiduciaries
should  indicate the  capacity in which they sign,  and where more than one name
appears,  a majority must sign. If a corporation,  this signature should be that
of an authorized officer who should state his or her title.

  X   PLEASE MARK VOTES
     AS IN THIS EXAMPLE

1.)  APPROVAL OF INVESTMENT                    For       Against       Abstain
     ADVISORY AGREEMENT WITH MFS
                                              ------      -------        ------




Please be sure to sign and date this Proxy.      Date:  ___________________




Shareholder sign here_____________________       Co-owner sign here____________


Mark box at right if comments or address change
have been noted on the reverse side of this card.    _____
<PAGE>


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