MFS SERIES TRUST XI
PRES14A, 1999-07-29
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                               VERTEX ALL CAP FUND
                            VERTEX U.S. ALL CAP FUND
                             VERTEX CONTRARIAN FUND
                500 Boylston Street, Boston, Massachusetts 02116
                            -------------------------


                    Notice of Special Meeting of Shareholders
                           To Be Held August 25, 1999


A Special  Meeting of  Shareholders of each of the Vertex All Cap Fund ("All Cap
Fund"),  Vertex U.S.  All Cap Fund ("U.S.  All Cap Fund") and Vertex  Contrarian
Fund  ("Contrarian  Fund"),  each a series of MFS Series Trust XI (the "Trust"),
will be held at 500 Boylston Street, Boston, Massachusetts, on Wednesday, August
25, 1999 at 9:30 a.m. for the following purposes:

ITEM 1.           To approve or disapprove new Investment  Advisory  Agreements
                  between Vertex Investment Management, Inc. and the Trust, on
                  behalf of each Fund.

ITEM 2.           To ratify the selection of Ernst & Young LLP as the
                  independent  public  accountants to be employed by the Trust
                  on behalf of each Fund for the fiscal year ending  September
                  30, 1999.

ITEM 3.           To consider and act upon any matter incidental to the
                  foregoing and to transact such other  business as may properly
                  come  before  the  Special  Meeting  of  Shareholders  and any
                  adjournments thereof.

    Your Trustees unanimously recommend that you vote in favor of all items.



Only  shareholders of record as of July 30, 1999 will be entitled to vote at the
Special Meeting of Shareholders and at any adjournments thereof.




                                                    STEPHEN E. CAVAN, Secretary
August 10, 1999



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

                                        -1-
<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 MFS
Series  Trust XI (the  "Trust")  on behalf of the  Vertex All Cap Fund ("All Cap
Fund"), Vertex U.S. All Cap Fund ("U.S. All Cap Fund") and the Vertex Contrarian
Fund  (the  "Contrarian  Fund"),  each a series  of the  Trust,  to be used at a
Special  Meeting of  Shareholders  to be held at 500  Boylston  Street,  Boston,
Massachusetts  on  Wednesday,  August  25,  1999,  at  9:30  a.m.,  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  August 10, 1999.  All
properly executed proxies received in time for the Special Meeting (by returning
the  enclosed  proxy  card)  will be voted as  specified  on the proxy or, if no
specification  is made,  in  favor of the  proposals  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, 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 Trust.  In the absence of a notice of revocation,  shares will
be voted in accordance with the proxy received last.

Shareholders of record at the close of business as of July 30, 1999 (the "Record
Date") will be entitled to one vote for each share held. There were ____________
shares of the All Cap Fund ($___  million in net assets),  __________  shares of
the U.S. All Cap Fund ($____ million in net assets) and _________  shares of the
Contrarian Fund ($___ million in net assets) outstanding on the Record Date.


For a free copy of each Fund's  Annual  Report dated  September 30, 1998 and its
semi-annual report dated March 31, 1999, write or call MFS Service Center, Inc.,
at 500 Boylston Street, Boston, Massachusetts 02116 or at (800) 225-2606.


ITEM 1.           TO APPROVE NEW INVESTMENT ADVISORY AGREEMENTS BETWEEN VERTEX
                  INVESTMENT MANAGEMENT,  INC. AND THE TRUST, ON BEHALF OF
                  EACH FUND

GENERAL


The Board of Trustees is  proposing  that  shareholders  approve new  Investment
Advisory  Agreements (the "New Agreements")  with Vertex Investment  Management,
Inc., a Delaware corporation ("VIM" or the "Adviser"), the effect of which would
be to  increase  the rate of  compensation  payable  by each Fund to VIM for its
services  as each  Fund's  investment  adviser and to change the manner in which
this   compensation  is  calculated.   VIM  is  a  wholly-owned   subsidiary  of
Massachusetts Financial Services Company, which

                                        -2-
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serves as the  investment  adviser  to the MFS  Family of  Funds.  The  Trustees
believe that the compensation under each New Agreement is reasonable in light of
comparative fee information,  each Fund's investment performance,  the Adviser's
expenses and  profitability  in managing  each Fund and the nature,  quality and
scope of services provided by VIM to each Fund.


BACKGROUND


The Trust  has  retained  the  Adviser  to  provide  each  Fund with  investment
management  services pursuant to separate  Investment  Advisory  Agreements each
dated April 29, 1998 (the "Current  Agreements").  The Current  Agreements  were
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 July 28, 1999, and most recently approved by Fund shareholders on
April 30,  1998.  The New  Agreements  were  approved by the Board of  Trustees,
including a majority of the Independent  Trustees,  on July 28, 1999, subject to
shareholder approval.


Current  Agreements.  Pursuant to the Current  Agreements,  the Adviser provides
each Fund with overall investment management services, as well as general office
facilities.  The Current  Agreements are substantially  identical to each other.
Subject to such  policies as the Board of Trustees  may  determine,  the Adviser
makes investment decisions for each Fund. As compensation for its services,  the
Adviser is entitled to a  management  fee paid by each Fund that is comprised of
two components (the "Current Fee").  The first component is a basic fee equal to
1.50% per annum of each Fund's  average daily net assets (the "Basic Fee"),  and
the second component is a performance fee adjustment. The Adviser has waived its
right to receive all management fees from each Fund from its inception.

The Current Agreements require each Fund to pay the Adviser,  at the end of each
month,  the Basic Fee of 1.50% (pro rated for the month based upon the number of
days in the month) of such Fund's  average daily net assets  (computed  over the
course of that month),  adjusted  upward or downward by 0.10% (pro rated for the
month based upon the number of days in the month) of such Fund's  average  daily
net assets (computed over the course of the Performance  Period,  defined below)
for each full percentage point that the Fund's  performance  during the prior 12
months  (the  "Performance  Period")  exceeds  or lags  the  performance  of the
Standard & Poor's 500 Stock Index (the "S&P 500 Index").  The maximum adjustment
(up or down) for a Fund's fiscal year can not exceed 1.50%,  so that the minimum
and maximum  management  fee paid by a Fund during any fiscal year is 0% and 3%,
respectively.  The S&P 500 Index is a market value weighted  benchmark of common
stock  performance,  and consists of the 500 largest  stocks (in terms of market
capitalization) in the United States.

Each Fund's  performance is calculated based on the net asset value per share of
the  Fund's  Class  A  shares.  For  purposes  of  calculating  the  performance
adjustment,  any dividends or capital gains  distributions paid by each Fund are
treated as if  reinvested  in

                                        -3-
<PAGE>


Class A shares  at the net  asset  value  per  share as of the  record  date for
payment.  The  performance of the S&P 500 Index is based on changes in its value
over the Performance Period and is adjusted to include as if reinvested any cash
distributions from the companies whose securities comprise the Index.

Because the adjustment to the Basic Fee is based on the comparative  performance
of each Fund and the record of the S&P 500 Index, the controlling  factor is not
whether the Fund performance is up or down, but whether it is up or down more or
less than the record of the Index.  The  comparative  investment  record of each
Fund is based  solely  on the  relevant  Performance  Period  without  regard to
cumulative performance over a longer or shorter period of time.

From time to time, the Trustees,  without  shareholder  approval,  may determine
that another  securities index is a more appropriate  benchmark than the S&P 500
Index for purposes of evaluating  the  performance  of a Fund. In such event,  a
successor  index may be substituted for the Index.  However,  the calculation of
the performance  adjustment for any portion of the  Performance  Period prior to
the  adoption  of the  successor  index  would  still be based  upon the  Fund's
performance compared to the S&P 500 Index.

The Basic Fee is computed  daily,  the  performance fee adjustment is calculated
once per month and the entire management fee,  allocated to each class of shares
in proportion to its average net assets, is normally paid monthly.

New  Agreements.  Shareholders  of each  Fund are being  asked to  approve a New
Agreement with a revised  management fee (the "Proposed  Fee"). The Proposed Fee
differs from the Current Fee in two respects.

First, the Basic Fee component of the investment management fee paid by the Fund
to the  Adviser  would be  increased  from  1.50% per annum to 2.00% per  annum.
Second,  the performance  fee adjustment  would be increased from 0.10% to 0.20%
for each full percentage point that the Fund's  performance  exceeds or lags the
S&P 500 Index..

Because the  performance fee would revolve around a 2.00% per annum Basic Fee as
opposed to a 1.50% per annum Basic Fee, the maximum  adjustment (up or down) for
a Fund's  fiscal year would not exceed  2.00% (as opposed to 1.50%).  Therefore,
the  minimum and  maximum  management  fee paid by a Fund during any fiscal year
would  be 0%  and  4%,  respectively  (as  opposed  to 0% to  3%).  Because  the
performance fee adjustment would increase or decrease in increments of 0.20% for
each full  percentage  point of over- or  under-performance  against the S&P 500
Index, VIM would receive the full 4% management fee if a Fund  out-performed the
Index by 10% or more, and would receive 0 if the Fund  under-performed the Index
by 10% or more.  Without this change in the manner in which the  performance fee
adjustment is calculated  (but assuming the change in the Basic Fee from 1.5% to
2% per annum), a Fund would have to out-perform the Index by 20% or more for VIM
to earn the full 4%  management  fee,  and VIM would  earn  nothing  if the Fund
under-performed  the Index by 20% or more.  These proposed changes in management
fees are the only substantial  difference between the Current

                                        -4-
<PAGE>

Agreements and the New  Agreements,  and the New  Agreements  are  substantially
identical to each other.

If approved by  shareholders  at the Special  Meeting,  the New Agreements  (and
therefore  the Proposed  Fee) will become  effective on October 1, 1999.  If the
amendments  are not  approved  by  shareholders,  the  Current  Agreements  will
continue  in effect in their  present  form,  subject  to the  continuation  and
termination  provisions  contained therein and described below. A description of
the New  Agreements and the services  provided by the Adviser  thereunder is set
forth below. See "Description of the New Agreements" below.


In approving the New Agreements and recommending their approval by shareholders,
the Trustees considered the best interests of the shareholders of each 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 each Fund
approve the New Agreement.

RATIONALE FOR THE PROPOSAL

At the request of the Adviser,  the Board of Trustees  discussed approval of the
New  Agreements  for each Fund at  meetings  held on April 28, 1999 and July 28,
1999. In addition,  the Independent  Trustees also discussed approval of the New
Agreements with their independent counsel. In evaluating the New Agreements, the
Board of Trustees requested and received  information from the Adviser to assist
in  their  deliberations.  The  Trustees  utilized  reports  sourced  by  Lipper
Analytical  Services,  Inc.  ("Lipper"),  a nationally  recognized,  independent
service that monitors  mutual fund  expenses and  performance,  and  significant
amounts of  information  furnished by the Adviser.  The Trustees  reviewed these
materials and considered  various  matters,  discussed below, in determining the
reasonableness  and  fairness  of the  proposed  changes in the  management  fee
payable by each Fund and reached the following conclusions:


o    First,  each Fund uses investment  leverage  through bank  borrowings,  and
     makes  extensive  use of  short  sales  and  various  types  of  derivative
     instruments.  These practices require a significant devotion of management,
     investment, trading and administrative resources;

o    Second,  management  fees  are  calculated  based  upon  net  assets.  As a
     consequence, the Adviser is effectively not compensated for managing assets
     derived from the bank borrowings, which may equal up to 50% of a Fund's net
     assets, notwithstanding that these assets are managed as part of the Fund's
     overall portfolio;


o    Third, the mechanics of the Securities and Exchange  Commission's  mandated
     calculation of the  performance fee adjustment  creates  distortions in the
     amount of compensation paid to an adviser of a rapidly growing or shrinking
     fund.  This  distortion  is a function  of basing the  monthly  performance
     adjustment  calculation  on  average  asset  levels  over  rolling 12 month
     periods.  The Basic Fee is permitted to be

                                        -5-
<PAGE>

     calculated  each month based on the average daily net assets that month. As
     a result,  in a rapidly  growing fund the amount of the Fund's  assets upon
     which a  performance  fee  adjustment  is  calculated  will lag the average
     assets of the Fund  calculated  on a more frequent  basis;  the opposite is
     true in the case of a rapidly shrinking fund;


o    Fourth,  to the  knowledge  of the  Trustees,  there  are very few other
     registered  mutual  funds  which  have the  broad  investment  mandate  and
     investment   practices  of  the  Funds.  This  fact  makes  any  meaningful
     management fee  comparison  between the Funds and other  registered  mutual
     funds problematic. Because the Funds are most similar to unregistered hedge
     funds, a comparison between the Funds and these unregistered hedge funds is
     meaningful.  The  Trustees  understand  that the  management  fee for these
     unregistered  funds  is  generally  a base fee  of3/4of  1% to 11/2% of net
     assets per annum,  plus a performance  fee of 20% of returns which exceed a
     so-called  "hurdle  rate." The hurdle rate is typically set at 6% to 10% of
     returns based on invested capital.  While federal  securities laws prohibit
     this type of fee from being used in connection with registered mutual funds
     like the Fund, this fee would generally far exceed the Proposed Fee;

o    Fifth,  the Adviser has provided high quality services with respect to each
     Fund. The investment performance of each Fund for the one year period ended
     April 30, 1999 (each Fund commenced  investment  operations on May 1, 1998)
     far  exceeded  the  performance  of the S&P 500 Index and the average  fund
     performance of each Fund's comparable Lipper Fund peer group;


o    Sixth,  in today's highly complex  investment  world,  the Trustees and the
     Adviser  both  believe  an  increased  fee  will  help the  Adviser  remain
     competitive  in  attracting,  retaining  and  motivating  the  top  quality
     investment  personnel and other key personnel necessary to manage each Fund
     and provide new and innovative services; and

o    Seventh, the Trustees considered today's ever-expanding securities markets,
     which  operate  continuously  around the globe.  The Trustees  believe that
     additional  resources  will  help  the  Adviser  maintain  state-of-the-art
     computer  systems,   access   information  and  analyze   strategies  using
     sophisticated tools and methodologies.

The Trustees reached these conclusions after careful discussion and analysis and
believe that they have  carefully  and  thoroughly  examined the  questions  and
alternatives. In recommending that the shareholders of each Fund approve the New
Agreement,  the Independent Trustees have considered what they believe to be the
best  interests of the  shareholders  of each Fund. In so doing the  Independent
Trustees  were  advised by  independent  counsel,  retained  by the  Independent
Trustees and paid by the Fund,  as to the nature of the matters to be considered
and the standards to be used in reaching their decision.

                                        -6-
<PAGE>

REVIEW PROCESS OF THE BOARD OF TRUSTEES

In reaching  its  decision,  the Board of  Trustees  examined  and weighed  many
factors,  including: (1) the nature, quality and extent of the services rendered
and the  results  achieved by the  Adviser  and its  affiliates  in the areas of
investment management (including investment  performance  comparisons with other
mutual funds and certain indices) and administrative  services; (2) the payments
received by the Adviser and its affiliates from all sources  involving each Fund
and the other  investment  companies  advised by the Adviser and its affiliates;
(3) extensive financial,  personnel and structural information as to the Adviser
and its  affiliates  including  the costs  borne by, and  profitability  of, the
Adviser and its affiliates in providing service of all types to each Fund and to
the other investment  companies  advised by the Adviser and its affiliates;  (4)
the  organizational   capabilities,   financial  condition  and  future  capital
requirements of the Adviser and its affiliates;  (5) an analysis of the proposed
fee rate changes;  (6) information  concerning each Fund's expense ratio on both
an existing and pro forma basis;  (7) information as to the management fees paid
by the other funds advised by the Adviser and its  affiliates;  (8)  competitive
industry fee  structures and expense ratios  including,  specifically  and where
available, the relationship of the Proposed Fee to those typically paid by other
collective investment funds with similar investment objectives; (9) a comparison
of the  overall  profitability  of the Adviser to the  profitability  of certain
other investment advisers, including the Adviser's profitability with respect to
each Fund; and (10) other factors the Board of Trustees deemed relevant. Certain
of these factors are discussed in more detail below.

Portfolio Performance. Each Fund commenced investment operations on May 1, 1998.
The Board of Trustees  determined  that the Adviser has  provided  high  quality
services with respect to each Fund.  In  particular,  the Trustees  reviewed the
performance for Class A shares of each Fund (the only class of shares  currently
offered for sale) against their applicable Lipper peer group. The Trustees noted
that,  for the one year period ended April 30, 1999, the All Cap Fund was ranked
2nd by Lipper out of 263 comparable mutual funds ranked by Lipper;  the U.S. All
Cap Fund was ranked 13th by Lipper out of 263 comparable  mutual funds ranked by
Lipper;  and the Contrarian  Fund was ranked 1st by Lipper out of 192 comparable
mutual  funds  ranked by Lipper.  These  rankings  do not take into  account the
deduction of applicable sales charges.

The Board of Trustees also determined that each Fund's absolute  performance and
performance  relative to comparable mutual funds and indices would not have been
materially affected if the Proposed Fee had been in effect from the commencement
of each Fund's investment operations.

                                        -7-

<PAGE>


Each Fund's total return for the year ended April 30, 1999, in  comparison  with
the total return of the comparable Lipper Fund Average and the S&P 500 Index, is
set forth below:


                            Year Ended April 30, 1999
                                                                          Total
          All Cap Fund                                                   Return

          Class A Shares................................................ 77.75%

          Class A Shares; assuming that the Current Fee was not
          waived by the Adviser*........................................ 76.25%

          Class A Shares; assuming the Proposed Fee was in effect for
          the period*................................................... 75.75%

          Lipper Growth Fund Average.................................... 16.85%

          Standard & Poor's 500 Index................................... 21.98%

                                                                          Total
          U.S. All Cap Fund                                              Return

          Class A Shares................................................ 34.70%

          Class A Shares; assuming that the Current Fee was not
          waived by the Adviser*........................................ 33.20%

          Class A Shares; assuming the Proposed Fee was in effect for
          the period*................................................... 32.70%

          Lipper Growth Fund Average.................................... 16.85%

          Standard & Poor's 500 Index................................... 21.98%

                                        -8-
<PAGE>


          Contrarian Fund

          Class A Shares................................................ 84.14%

          Class A Shares; assuming that the Current Fee was not
          waived by the Adviser*........................................ 82.64%

          Class A Shares; assuming the Proposed Fee was in effect for
          the period*................................................... 82.14%

          Lipper Growth and Income Fund Average......................... 11.88%

          Standard & Poor's 500 Index................................... 21.98%

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

*    If the  Current  Fee or  Proposed  Fee been  charged,  only the  Basic  Fee
     component would have been assessed  because the Funds commenced  investment
     operations on May 1, 1998.  The  performance  fee  adjustment  only applies
     after the Funds have completed 12 months of investment operations.


The S&P 500 Index is unmanaged,  assumes reinvestment of estimated dividends and
does not reflect  fees and  expenses.  Investors  may not invest  directly in an
index. The Lipper Fund Averages and each Fund's performance assume  reinvestment
of capital gains and dividends and do not reflect the deduction of sale charges.


The Trustees also  considered  the nature,  quality and extent of the investment
advisory services rendered by the Adviser to each Fund as well as the background
of the portfolio  managers and other executive  personnel of the Adviser and its
affiliates.  The  Adviser  provided  insights  on the  competition  it  faces in
attracting top quality  personnel and the Trustees reviewed the Adviser's recent
additions of portfolio  managers,  analysts and others  involved in research and
quantitative analysis.


Actual  and Pro  Forma  Management  Fees and  Expenses.  The  Board of  Trustees
considered  the effect of the  Proposed  Fee on each Fund's fee rates and annual
expense  ratios  (which  include  the  management  fee and all  other  operating
expenses  incurred by each Fund).  The table set forth below under "Effect of an
Increase in the Management Fee" provides  comparative data for the fiscal period
ended  September  30,  1998,  assuming  that the Proposed Fee had been in effect
throughout the period.


Costs of Providing  Service and  Profitability.  The Board of Trustees  reviewed
information  concerning  profitability  of the Adviser's  (and its  affiliates')
investment  advisory  and other  activities  and its  financial  condition.  The
information   considered  by  the  Trustees  included  operating  profit  margin
information  both before and after the Adviser's net expenditures for marketing.
The Trustees also reviewed profitability data for the Adviser and its affiliates
on a fund-by-fund basis.

                                        -9-
<PAGE>

The  Trustees  recognized  that the  growth of assets  under  management  by the
Adviser would have positive effects on the Adviser's  profitability even without
the proposed fee increase;  however,  the Trustees also considered the fact that
the proposed fee increase  would  enhance the  Adviser's  ability to attract and
retain  highly  qualified  investment  and  administrative   professional  in  a
competitive investment management environment, and thus address the expectations
of  the  Trustees  regarding  the  performance  of  each  Fund  that  only  such
professionals can satisfy.


Certain  assumptions  and  methods  of  allocation  utilized  by the  Adviser in
preparing  fund-by-fund  data were reviewed by the  Trustees.  While the Adviser
believes  that the  methods  of  allocation  used  were  reasonable,  there  are
limitations  inherent  in  allocating  costs  to  multiple  individual  advisory
products served by an organization  such as the Adviser and its affiliates where
each of the advisory  products draws on, and benefits from, the pooled  research
of the organization.


Comparisons  with Other Funds. To the knowledge of the Trustees,  there are very
few other registered  mutual funds which have the broad  investment  mandate and
investment practices of the Funds. This fact makes any meaningful management fee
comparison  between the Funds and other  registered  mutual  funds  problematic.
Because the Funds are most similar to  unregistered  hedge  funds,  a comparison
between the Funds and these unregistered hedge funds is meaningful. The Trustees
understand that the management fee for these  unregistered  funds is generally a
base fee of 3/4 of 1% to 1 1/2% of net assets per annum,  plus a performance fee
of 20% of returns  which  exceed a so-called  "hurdle  rate." The hurdle rate is
typically set at 6% to 10% of returns based on invested  capital.  While federal
securities  laws prohibit  this type of fee from being used in  connection  with
registered  mutual funds such as the Fund,  this fee would  generally far exceed
the Proposed Fee.

The All Cap Fund had a total return of 77.75% for the year ended April 30, 1999.
The maximum management fee the Fund would pay to the Adviser,  assuming that the
Proposed  Fee was in effect for the entire year and the  performance  adjustment
was applied, is 4% per annum,  equaling  approximately $63,913 (assuming average
daily net  assets  for the year of  $1,597,835).  Under the  Proposed  Fee,  the
Adviser would  receive a Basic Fee of 2.00% per annum plus a performance  fee of
0.20% for each 1% of  over-performance  above the S&P 500 Index, up to a maximum
of 2.00%  per  annum.  Therefore,  the  Adviser  is not  compensated  under  the
performance  fee adjustment for  performance  that exceeds 10 percentage  points
above the S&P 500 Index. Because the Fund had a 77.75% total return for the year
ended April 30, 1999, while the S&P 500 Index had a 21.98% total return for this
period, the Adviser's compensation under the performance fee adjustment would be
limited to the 10 percentage  points of  over-performance  above the Index,  but
would not include the additional  45.77  percentage  points of  over-performance
above the Index.

                                        -10-
<PAGE>

A typical  unregistered  hedge  fund  would pay a  performance  fee based on the
entire  amount of the  over-performance  above its  benchmark  index,  after the
hurdle rate has been  satisfied.  Therefore,  assuming that the hedge fund had a
77.75% total return compared to a benchmark return of 21.98% and that the hurdle
rate was 8%, the performance fee would be based upon the 47.77 percentage points
of over-performance (55.77% of over-performance minus the 8% hurdle rate), while
the performance fee for the Fund, as noted above,  would be based only on the 10
percentage points of over-performance.

In  addition,  compared to the hedge fund's basic fee of 3/4 of 1% to 1 1/2% per
annum, which is paid regardless of the fund's  performance,  the Fund's proposed
Basic Fee of 2.00%  per annum  would  fall to 0 if the Fund  under-performs  its
Index by 10 percentage  points.  However,  unlike the Fund, the  performance fee
adjustment for a typical hedge fund is not paid until all prior losses have been
made up.


Non-Advisory  Services  Provided to the Fund. The Board of Trustees reviewed the
general nature of the non-investment  advisory services performed by the Adviser
and its affiliates,  such as  administrative,  transfer agency and  distribution
services and the fees received by the Adviser and its  affiliates for performing
such  services.  In addition to  reviewing  such  services,  the  Trustees  also
considered  the  organizational  structure  employed  by  the  Adviser  and  its
affiliates to provide those services.

EFFECT OF AN INCREASE IN THE MANAGEMENT FEE


The effect of the proposed changes in each Fund's  management fee is illustrated
below.  For the fiscal  period  ended  September  30, 1998 (each Fund  commenced
investment  operations on May 1, 1998), this information  illustrates the amount
each Fund was  obligated  to pay to the Adviser  under the Current  Fee, and the
amount  each  Fund  would  have been  obligated  to pay to the  Adviser  had the
Proposed  Fee been in effect  for the  entire  period.  MFS  waived its right to
receive investment management fees from each Fund during this period;  therefore
the Funds' did not, in fact, incur any management fees for this period.


                         Period ended September 30, 1998
               (commencement of investment operations May 1, 1998)

                                  All Cap Fund

                      % of Average
Management Fee       Daily Net Assets        Amount of Fee        % Change

  Current Fee             1.50%                 $5,848
  Proposed Fee            2.00%                 $7,840
  Difference              0.50%                 $1,992               34%

                                        -11-
<PAGE>

                                U.S. All Cap Fund

                      % of Average
Management Fee       Daily Net Assets        Amount of Fee        % Change

  Current Fee             1.50%                 $1,915
  Proposed Fee            2.00%                 $2,568
  Difference              0.50%                   $653               34%

                                 Contrarian Fund

                      % of Average
Management Fee       Daily Net Assets        Amount of Fee        % Change

  Current Fee             1.50%                 $2,322
  Proposed Fee            2.00%                 $3,106
  Difference              0.50%                   $784               34%


MFS acts as each Fund's  administrator  for which it receives an  administrative
services fee from each Fund.  For the period from May 1, 1998  (commencement  of
investment  operations) to September 30, 1998, the  administrative  services fee
paid to MFS by the All Cap Fund was $59, by the U.S.  All Cap Fund was $19,  and
by the Contrarian  Fund was $23. MFS Service  Center,  Inc.  ("MFSC"),  a wholly
owned subsidiary of MFS, provides  shareholder  agency services to each Fund for
which it received a fee during  this period from the All Cap Fund of $438,  U.S.
All Cap Fund of $144, and Contrarian Fund of $175.

Shown below is a chart of the  expenses and fees each Fund  incurred  during its
fiscal period ended  September 30, 1998,  together with pro forma fees each Fund
would have paid had the Proposed Fee been in effect the entire period.


EXPENSE TABLE

This table describes the fees and expenses that you may pay when you buy, redeem
and hold shares of each Fund.

                                        -12-
<PAGE>

Shareholder Fees (fees paid directly from your investment):

<TABLE>
<CAPTION>
<S>                                      <C>                     <C>                <C>                <C>
                                         Class A                 Class B            Class C            Class I
                                                Pro                     Pro                Pro                Pro
                                    Current     Forma       Current     Forma     Current  Forma     Current  Forma
Maximum Sales Charge (Load
Imposed on Purchases (as a
percentage of offering price).....   5.75%      5.75%        None        None      None     None      None      None

Maximum Deferred Sales Charge
(Load)(as a percentage of original
purchase price or redemption        See        See
proceeds, whichever is less)......  Below(1)   Below(1)     4.00%       4.00%     1.00%    1.00%     None      None

</TABLE>

Annual Fund Operating Expenses (expenses that are deducted from Fund assets):

                                                      All Cap Fund
<TABLE>
<CAPTION>
<S>                                      <C>                     <C>                <C>                <C>
                                         Class A                 Class B            Class C            Class I
                                                Pro                     Pro                Pro                Pro
                                    Current     Forma       Current     Forma     Current  Forma     Current  Forma
Management Fees...................   1.50%      2.00%       1.50%       2.00%     1.50%    2.00%     1.50%    2.00%
Distribution and
   Service (12b-1) Fees2..........   0.35       0.35        1.00        1.00      1.00     1.00      0.00     0.00
Other Expenses3...................   6.77       6.77        6.77        6.77      6.77     6.77      6.77     6.77
                                     ----       ----        ----        ----      ----     ----      ----     ----
Total Annual Fund
   Operating Expenses.............   8.62       9.12        9.27        9.77      9.27     9.77      8.27     8.77
   Fee Waivers and/or Expense
       Reimbursement4.............   6.62       7.12        6.27        6.77      6.27     6.77      6.27     6.77
                                     ====       ====        ====        ====      ====     ====      ====     ====
  Net Expenses....................   2.00%      2.00%       3.00%      3.00%      3.00%    3.00%     2.00%    2.00%

</TABLE>

                                                   U.S. All Cap Fund
<TABLE>
<CAPTION>
<S>                                      <C>                     <C>                <C>                <C>
                                         Class A                 Class B            Class C            Class I
                                                Pro                     Pro                Pro                Pro
                                    Current     Forma       Current     Forma     Current  Forma     Current  Forma
Management Fees...................   1.50%      2.00%       1.50%      2.00%      1.50%    2.00%     1.50%    2.00%
Distribution and
   Service (12b-1) Fees2..........   0.35       0.35        1.00       1.00       1.00     1.00      0.00     0.00
Other Expenses3...................  20.01      20.01       20.01      20.01      20.01    20.01     20.01    20.01
                                    -----      -----       -----      -----      -----    -----     -----    -----
Total Annual Fund
   Operating Expenses.............  21.86      22.36       22.51      23.01      22.51    23.01     21.51    22.01
   Fee Waivers and/or Expense
       Reimbursement4.............  19.86      20.36       19.51      20.01      19.51    20.01     19.51    20.01
                                    =====      =====       =====      =====      =====    =====     =====    =====
  Net Expenses....................   2.00%      2.00%       3.00%      3.00%      3.00%    3.00%     2.00%    2.00%

</TABLE>
                                        -13-
<PAGE>

                                                    Contrarian Fund
<TABLE>
<CAPTION>
<S>                                      <C>                     <C>                <C>                <C>
                                         Class A                 Class B            Class C            Class I
                                                Pro                     Pro                Pro                Pro
                                    Current     Forma       Current     Forma     Current  Forma     Current  Forma
Management Fees...................   1.50%      2.00%       1.50%      2.00%      1.50%    2.00%     1.50%    2.00%
Distribution and
   Service (12b-1) Fees2..........   0.35       0.35        1.00       1.00       1.00     1.00      0.00     0.00
Other Expenses3...................  13.84      13.84       13.84      13.84      13.84    13.84     13.84    13.84
                                    -----      -----       -----      -----      -----    -----     -----    -----
Total Annual Fund
   Operating Expenses.............  15.69      16.19       16.34      16.84      16.34    16.84     15.34    15.84
   Fee Waivers and/or Expense
       Reimbursement4.............  13.69      14.19       13.34      13.84      13.34    13.84     13.34    13.84
                                    =====      =====       =====      =====      =====    =====     =====    =====
  Net Expenses....................   2.00%      2.00%       3.00%      3.00%      3.00%    3.00%     2.00%    2.00%

</TABLE>

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

(1)    An initial  sales charge will not be deducted  from your  purchase if you
       buy $1 million or more of Class A shares, or if you are investing through
       a retirement  plan and your Class A purchase meets certain  requirements.
       However, in this case, a contingent deferred sales charge (referred to as
       a CDSC) of 1% may be deducted from your redemption proceeds if you redeem
       your investment within 12 months.

(2)    Each Fund adopted a distribution plan under Rule 12b-1 that permits it to
       pay  marketing  and other fees to support  the sale and  distribution  of
       Class  A, B and C  shares  and  the  services  provided  to  you by  your
       financial adviser (referred to as distribution and service fees).

(3)    Each Fund has an expense offset  arrangement  which reduces its custodian
       fee  based  upon the  amount  of cash  maintained  by the  Fund  with its
       custodian and dividend  disbursing  agent. Each Fund may enter into other
       similar  arrangements and directed  brokerage  arrangements,  which would
       also have the effect of reducing the Fund's expenses. "Other Expenses" do
       not take into account these expense reductions,  and are therefore higher
       than the actual expenses of the Fund.

(4)    The  Adviser  has  contractually  agreed to waive  its  right to  receive
       management fees from each Fund. The Adviser has also contractually agreed
       to bear the expenses of each Fund, subject to reimbursement by each Fund,
       such that "Other  Expenses"  do not exceed 2.00% per annum of such Fund's
       average  daily net assets.  Each  Fund's  distributor  has  contractually
       agreed  to waive  its  right to  receive  the  0.35%  per  annum  Class A
       distribution  and  service  fees from each Fund.  These  contractual  fee
       arrangements  will  remain in effect  until at least  February  1,  2000,
       absent an earlier  modification  approved by the Board of Trustees  which
       oversees each Fund.

EXAMPLE OF EXPENSES

These  examples  are  intended to help you compare the cost of investing in each
Fund with the cost of investing in other mutual funds.

The examples assume that:

o      You  invest  $10,000  in a Fund for the time  periods  indicated  and you
       redeem your shares at the end of the time periods;

                                        -14-
<PAGE>

o      Your  investment  has a 5%  return  each  year and  dividends  and  other
       distributions are reinvested; and


o      The Fund's operating  expenses remain the same, except that the Fund's
       total  operating  expenses are assumed to be the Fund's "Net Expenses"
       for the first  year,  and the  Fund's  "Total  Annual  Fund  Operating
       Expenses" for subsequent  years (see "Annual Fund  Operating  Expense"
       table above).


Although your actual costs may be higher or lower,  under these assumptions your
costs would be:

                                  All Cap Fund
<TABLE>
<CAPTION>
<S>                                  <C>               <C>                 <C>                 <C>
                                     1 Year            3 Years             5 Years             10 Years
                                     ------            -------             -------             --------
Class A Shares
Current Fee..................     $766      -      $2,380      -       $3,879      -      $7,176        -
Proposed Fee.................     $766      -      $2,465      -       $4,026      -      $7,401        -
Class B Shares                             (1)                (1)                 (1)                  (1)
Current Fee..................     $703     $303    $2,414    $2,114    $3,974   $3,774    $7,256(2)  $7,256(2)
Proposed Fee.................     $703     $303    $2,502    $2,202    $4,124   $3,924    $7,479     $7,479
Class C Shares
Current Fee..................     $403     $303    $2,114    $2,114    $3,774   $3,774    $7,342     $7,342
Proposed Fee.................     $403     $303    $2,202    $2,202    $3,924   $3,924    $7,561     $7,561
Class I Shares
Current Fee..................     $203      -      $1,851      -       $3,394      -      $6,829        -
Proposed Fee.................     $203      -      $1,942      -       $3,553      -      $7,077        -

</TABLE>

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

(1) Assumes no redemption
(2) Class B shares convert to Class A shares approximately eight years after
    purchase; therefore, years nine and ten reflect Class A expenses.

                                U.S. All Cap Fund

<TABLE>
<CAPTION>
<S>                                  <C>              <C>                 <C>                   <C>
                                     1 Year           3 Years             5 Years               10 Years
                                     ------           -------             -------               --------
Class A Shares
Current Fee..................     $766     -      $4,325      -       $6,785       -     $10,104           -
Proposed Fee.................     $766     -      $4,387      -       $6,859       -     $10,132           -
Class B Shares                            (1)                (1)                  (1)                     (1)
Current Fee..................     $703    $303    $4,426    $4,216    $6,928    $6,728   $10,130(2)   $10,130(2)
Proposed Fee.................     $703    $303    $4,490    $4,190    $7,003    $6,803   $10,155      $10,155
Class C Shares
Current Fee..................     $403    $303    $4,126    $4,126    $6,728    $6,723   $10,152      $10,152
Proposed Fee.................     $403    $303    $4,190    $4,190    $6,803    $6,803   $10,176      $10,176
Class I Shares
Current Fee..................     $203     -      $3,933      -       $6,533       -     $10,088           -
Proposed Fee.................     $203     -      $3,999      -       $6,613       -     $10,120           -

</TABLE>

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

(1) Assumes no redemption

                                        -15-
<PAGE>

(2) Class B shares convert to Class A shares approximately eight years after
    purchase; therefore, years nine and ten reflect Class A expenses.


                                 Contrarian Fund
<TABLE>
<CAPTION>
<S>                                  <C>               <C>                 <C>                 <C>
                                     1 Year            3 Years             5 Years             10 Years
                                     ------            -------             -------             --------
Class A Shares
Current Fee..................     $766      -      $3,496      -       $5,673      -      $9,378        -
Proposed Fee.................     $766      -      $3,568      -       $5,777      -      $9,469        -
Class B Shares                             (1)                (1)                 (1)                  (1)
Current Fee..................     $703     $303    $3,569    $3,269    $5,801   $5,601    $9,432(2)  $9,432(2)
Proposed Fee.................     $703     $303    $3,644    $3,344    $5,901   $5,707    $9,521     $9,521
Class C Shares
Current Fee..................     $403     $303    $3,269    $3,269    $5,601   $5,601    $9,474     $9,474
Proposed Fee.................     $403     $303    $3,344    $3,344    $5,707   $5,707    $9,561     $9,561
Class I Shares
Current Fee..................     $203      -      $3,045      -       $5,329      -      $9,268        -
Proposed Fee.................     $203      -      $3,122      -       $5,442      -      $9,370        -

</TABLE>

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

(1) Assumes no redemption
(2) Class B shares convert to Class A shares approximately eight years after
    purchase; therefore, years nine and ten reflect Class A expenses.


FEES OF SIMILAR FUNDS MANAGED BY THE ADVISER

The  Adviser  does not act as the  investment  adviser  to any other  registered
investment company having similar investment  objectives and policies to that of
the Funds.  Therefore,  information  concerning  management  fees charged by the
Adviser for similar fund management is not available.


INVESTMENT ADVISER

The Adviser is a wholly-owned  subsidiary of MFS. 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  $114  billion  on behalf of over 4.2
million  investor  accounts as of June 30, 1999. MFS is a subsidiary of Sun Life
Assurance Company of Canada (U.S.) Financial Services Holdings,  Inc. ("Sun Life
of Canada (U.S.)"),  which in turn is an indirect wholly owned subsidiary of Sun
Life Assurance Company of Canada ("Sun Life"). Sun Life, a mutual life insurance
company,  is one of the largest  international life insurance  companies and has
been  operating in the United  States since 1895,  establishing  a  headquarters
office here in 1973.

                                        -16-
<PAGE>

The  Directors  of the Adviser  are  Jeffrey L. Shames and Arnold D. Scott.  Mr.
Shames is also the President of the Adviser.  The address of Messrs.  Shames and
Scott is 500 Boylston Street, Boston, Massachusetts 02116.


Mr.  Shames,  the Chairman,  President  and a Trustee of the Trust,  is also, as
noted above, the President and a Director of the Adviser.  Stephen E. Cavan, the
Secretary of the Trust,  is also the  Secretary  of the Adviser.  As of June 30,
1999,  except  as  noted  below,  no  officer  or  Trustee  of  any  Fund  owned
beneficially  greater than 1% of the outstanding  shares of any Fund. As of June
30, 1999, James R. Bordewick, Jr. owned 1% of the All Cap Fund. As of such date,
the officers and Trustees of each Fund in the aggregate owned  beneficially less
than 1% of the  outstanding  shares of each Fund.  [NOTE - TRUSTEES  ARE SHAMES,
DARLING AND GUTOW AND OFFICERS ARE CAVAN, BORDEWICK,  LONDON, BRADLEY,  MOYNIHAN
AND YOST.]


In certain  instances  there may be  securities  which are suitable for a Fund's
portfolio  as well as for  portfolios  of other  clients of the  Adviser and its
affiliates.  Some simultaneous  transactions are inevitable when several clients
receive investment advice from the Adviser and its affiliates, 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 a Fund is concerned,  in other cases, however, it may produce
increased investment opportunities for a Fund.

Broker-dealers may be willing to furnish statistical, research and other factual
information or services to the Adviser and its  affiliates 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 a Fund.


For the current fiscal year, the Board of Trustees,  together with the Boards of
Trustees  of certain  other  funds  advised by the  Adviser's  affiliates,  have
directed  the  Adviser  and its  affiliates  to  allocate  a total of $72,500 of
commission  business  from the  Funds  and  these  other  funds to the  Pershing
Division  of  Donaldson,  Lufkin and  Jenrette as  consideration  for the annual
renewal of certain  publications  provided by Lipper (which provides information
useful to the Board of Trustees in reviewing the relationship  between each Fund
and the Adviser).


The address of the Adviser and MFS Fund Distributors,  Inc. ("MFD"), each Fund's
distributor, is 500 Boylston Street, Boston, Massachusetts 02116.

DESCRIPTION OF THE NEW AGREEMENTS


As noted above,  the Current  Agreement  for each Fund and the New Agreement for
each Fund are identical except that each New Agreement reflects the Proposed Fee
(each New Agreement  also has a new  commencement  date and  termination  date).
Under each New Agreement, the Adviser provides portfolio management services for
each Fund, including  investment research,  advice and supervision of the Fund's
assets.

                                        -17-
<PAGE>

Each Fund pays its  expenses  (other than those  assumed by the Adviser or MFD),
including:  investment advisory and administrative services;  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 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 each Fund and the  preparation,  printing and mailing
of  prospectuses  for  such  purposes  are  borne by the  Fund  except  that its
Distribution  Agreement with MFD, each Fund's  distributor,  requires MFD to pay
for prospectuses that are to be used for sales purposes.

The Adviser pays the  compensation  of the Trust's  officers who are  affiliated
with the  Adviser or its  affiliates  and any  Trustee  who is an officer of the
Adviser or its  affiliates.  The Adviser  also  furnishes at its own expense all
necessary  portfolio  management  services,  including office space,  equipment,
clerical  personnel,  investment  advisory  facilities,  and all  executive  and
supervisory  personnel  necessary  for  managing  each  Fund's  investments  and
effecting transactions in their portfolio securities.

The New  Agreement  for  each  Fund  provides  that in the  absence  of  willful
misfeasance,  bad faith or gross negligence, the Adviser shall not be liable for
any act or omission in the course of, or in  connection  with,  the rendering of
its services thereunder.


The New Agreement for each Fund, if approved,  will remain in effect pursuant to
its terms until  September  30, 2001 (for the Current  Agreement  for each Fund,
this date is April 29, 2000), and thereafter for successive  one-year 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 a  majority  of the
outstanding  voting  securities  of the Fund,  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.  Under the 1940 Act, a "vote of a majority of the  outstanding  voting
securities"  of the Fund  means the  affirmative  vote of the lesser of (1) more
than 50% of the outstanding  shares of the Fund or (2) 67% or more of the shares
present at a shareholders'  meeting if more than 50% of the  outstanding  shares
are  represented  at the  meeting  in person  or by proxy (a "1940 Act  Majority
Vote"). The New Agreement for each Fund is terminable,  without penalty,  by the
Board of Trustees,  by a 1940 Act Majority Vote of the Fund's shareholders or by
the  Adviser,  in each case on not more than  sixty nor less than  thirty  days'
written notice to the other party and to the Fund. The New Agreement  terminates
automatically in the event of its assignment (as defined in the 1940 Act).

                                        -18-
<PAGE>

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

REQUIRED VOTE

Approval of the New Agreement for each Fund requires a 1940 Act Majority Vote of
that Fund's shareholders (as defined above).

The Board of Trustees unanimously recommends that shareholders of each Fund vote
FOR approval of the New Agreement.


ITEM 2.  RATIFICATION OF SELECTION OF ACCOUNTANTS


It is intended  that proxies not limited to the contrary  will be voted in favor
of ratifying the  selection,  by a majority of the  Independent  Trustees of the
Trust,  of  Ernst & Young  LLP  pursuant  to  Section  32 (a) of the 1940 Act as
independent  public  accountants.  Ernst & Young LLP has been engaged to certify
every  financial  statement of the Trust on behalf of each Fund  required by any
law or regulation to be certified by independent  public  accountants  and filed
with the SEC in respect of all or any part of the fiscal year  ending  September
30, 1999. Ernst & Young LLP has no direct or material  indirect  interest in the
Trust or any  Fund.  A  representative  of Ernst & Young LLP is  expected  to be
present at the Special  Meeting and will have an opportunity to make a statement
if he desires to do so. Such  representative is also expected to be available to
respond to appropriate questions.


The Board of Trustees unanimously recommends that shareholders of each Fund vote
FOR the approval of this item.

MANNER OF VOTING PROXIES

All proxies received by management will be voted on all matters presented at the
Special  Meeting  and at any  adjournments  therefor,  and if not limited to the
contrary, will be voted FOR Items 1 and 2.

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,
and will have no effect on the vote with respect to Item 2.

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 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.

                                        -19-
<PAGE>

SUBMISSION OF CERTAIN PROPOSALS

The Trust is a Massachusetts 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
advisory 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

As of the Record Date, [PROVIDE 5% HOLDER INFORMATION]

The information  contained in this proxy  statement  relating to the Adviser has
been  furnished  by the  Adviser.  The  Adviser  will pay all costs of the proxy
solicitation.

In the event that  sufficient  votes in favor of the  proposals set forth in the
Notice of Special Meeting are not received by August 25, 1999, 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 any such adjournment  those proxies required to
be voted in favor of the proposal for which 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 Adviser.

                IT IS IMPORTANT THAT PROXIES BE RETURNED PROMPTLY

August 10, 1999

                                        -20-
<PAGE>



                                                                      EXHIBIT A

                                     FORM OF

                          INVESTMENT ADVISORY AGREEMENT





         INVESTMENT ADVISORY AGREEMENT,  dated this 30th day of September, 1999,
by and  between  MFS  SERIES  TRUST  XI, a  Massachusetts  business  trust  (the
"Trust"),  on behalf of VERTEX  ____________  FUND,  a series of the Trust  (the
"Fund"),  and VERTEX INVESTMENT  MANAGEMENT,  INC., 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 Trust's Amended and
Restated  Declaration  of Trust,  dated January 24, 1996,  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  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
<PAGE>


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.

The Adviser may from time to time enter into sub-investment  advisory agreements
with one or more  investment  advisers  with such  terms and  conditions  as the
Adviser may determine,  provided that such  sub-investment  advisory  agreements
have been approved in accordance  with  applicable  provisions of the Investment
Company Act of 1940.  Subject to the  provisions of Article 6, the Adviser shall
not be liable for any error of judgment or mistake of law by any  sub-adviser or
for any loss arising out of any  investment  made by any  sub-adviser or for any
act or omission in the execution and management of the Fund by any sub-adviser.

         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
<PAGE>

Agreement to which the Trust is a party  provides  that another  party is to pay
some or all of such expenses).


         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 a base
investment advisory fee subject to a performance  adjustment,  computed and paid
monthly,  beginning,  in the case of the  performance  adjustment  only,  in the
thirteenth  month  following  commencement  of operations of the Fund.  The base
investment  advisory  fee  shall be at an  annual  rate of  1.50% of the  Fund's
average daily net assets from May 1, 1998 through  September 30, 1999, and 2.00%
of the Fund's average daily net assets thereafter.  The base investment advisory
fee shall be increased by 0.10% (for all  performance  periods ended on or prior
to September 30, 1999) or 0.20% (for all  performance  periods ended on or after
October 31, 1999) for each full 1% that the investment  performance of a Class A
share of  beneficial  interest  of the Fund  during the  performance  period has
exceeded  the  investment  record of the index,  and shall be decreased by 0.10%
(for all  performance  periods ended on or prior to September 30, 1999) or 0.20%
(for all  performance  periods ended on or after October 31, 1999) for each full
1% by which the investment performance of a Class A share of beneficial interest
of the Fund  during the  performance  period  has been less than the  investment
record of the index; provided, however, that no increase or decrease in the base
investment  advisory  fee rate shall  exceed 1.50% per annum for the period from
May 1, 1998 through September 30, 1999, and 2.00% per annum thereafter.  As used
in this Article 3, the term "index" means such  appropriate  index of securities
prices as the Trust's Board of Trustees  shall choose from time to time, and the
term  "performance  period" means the twelve month period ending on the last day
of the month immediately  preceding the monthly  computation  called for by this
Article 3. In  computing  the  amount of the base fee,  the fee shall be applied
against the Fund's  average  daily net assets  computed over the month for which
the base fee is paid; in computing the amount of the performance adjustment, the
adjustment shall be applied against the Fund's average daily net assets computed
over the performance  period. If the Adviser shall serve for less than the whole
of any  period  specified  in this  Article 3, the  compensation  payable to the
Adviser with respect to the Fund shall 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
distributor, 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.
<PAGE>

         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  and its
successors or assignees may permit other fund clients to use the initials  "MFS"
in their  names.  The Fund  agrees  that if the  Adviser  or its  successors  or
assignees  shall for any reason no longer  serve as the  Adviser to the Fund and
the Fund's name contains the initials "MFS", 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 Trust,
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 relations between the parties hereto thereafter,  and shall remain in
force  until  September  30,  2001 on which  date it will  terminate  unless its
continuance  after  September  30,  2001  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  amendment is approved by
"vote of a majority of the outstanding voting securities" of the Fund.

         Article  9.  Scope  of  Trust's  Obligations.  A copy  of  the  Trust's
Declaration of Trust is on file with the Secretary of State of The  Commonwealth
of  Massachusetts.  The Adviser  acknowledges that the obligations of or arising
out of  this  Agreement  are  not  binding  upon  any of the  Trust's  trustees,
officers, employees, agents or shareholders individually, but are binding solely
upon the assets and property of the Trust.  If this Agreement is executed by the
Trust  on  behalf  of one or more  series  of the  Trust,  the  Adviser  further
acknowledges  that the assets and  liabilities  of each  series of the Trust are
<PAGE>

separate  and  distinct  and  that the  obligations  of or  arising  out of this
Agreement are binding  solely upon the assets or property of the series on whose
behalf the Trust has executed this Agreement.

         Article  10.  Definitions.  The terms  "specifically  approved at least
annually,"  "vote  of  a  majority  of  the  outstanding   voting   securities,"
"assignment,"   "affiliated  person,"  "investment   performance,"   "investment
record," 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.

         Article 11. Record Keeping. The Adviser will maintain records in a form
acceptable to the Trust and in compliance  with the rules and regulations of the
Securities  and  Exchange  Commission,  including  but not  limited  to  records
required to be maintained by Section 31(a) of the Investment Company Act of 1940
and the rules  thereunder,  which at all times will be the property of the Trust
and will be available for inspection and use by the Trust.

         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.


                                      MFS SERIES TRUST XI, on behalf of
                                      VERTEX __________ FUND, one of its series


                                      By:
                                           James R. Bordewick, Jr.
                                           Assistant Secretary



                                      VERTEX INVESTMENT MANAGEMENT, INC.


                                      By:
                                           Jeffrey L. Shames
                                           Chairman




<PAGE>


        THIS PROXY IS SOLICITED AND ON BEHALF OF THE BOARD OF TRUSTEES OF
                              VERTEX ALL CAP FUND
         Proxy for the Special Meeting of Shareholders, August 25, 1999

The undersigned  hereby appoints JAMES R. BORDEWICK,  JR.,  STEPHEN E. CAVAN, W.
THOMAS LONDON,  ARNOLD D. SCOTT,  JEFFREY L. SHAMES,  and each of them,  proxies
with several powers of substitution,  to vote for the undersigned at the Special
Meeting  of  Shareholders  of VERTEX  ALL CAP FUND,  to be held at 500  Boylston
Street,  Boston,  Massachusetts,  on  Wednesday,  August 25,  1999 at 9:30 a.m.,
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. THE PROPOSALS HAVE BEEN PROPOSED BY THE BOARD OF
TRUSTEES.  IF NO  DIRECTION IS GIVEN ON THE  PROPOSALS,  THIS PROXY CARD WILL BE
VOTED  "FOR"  ITEMS 1 AND 2. THE  PROXY  WILL BE VOTED  IN  ACCORDANCE  WITH THE
HOLDER'S BEST JUDGMENT AS TO ANY OTHER MATTER.


         PLEASE VOTE AND SIGN AND RETURN PROMPTLY IN ENCLOSED ENVELOPE.


Please sign this proxy  exactly as your name  appears.  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.

         PLEASE MARK VOTES
         AS IN THIS EXAMPLE

1.)      NEW ADVISORY AGREEMENT WITH            For        Against      Abstain
         VERTEX INVESTMENT MANAGEMENT, INC.
                                                ------     ------       ------


2.)      RATIFICATION OF
         SELECTION OF ACCOUNTANTS               ______     ______       ______




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


Shareholder sign here__________________  Co-owner sign here:___________________




Mark Line at right if comments or address change
have been noted on the reverse side of this card.             ______





<PAGE>


        THIS PROXY IS SOLICITED AND ON BEHALF OF THE BOARD OF TRUSTEES OF
                            VERTEX U.S. ALL CAP FUND
         Proxy for the Special Meeting of Shareholders, August 25, 1999

The undersigned  hereby appoints JAMES R. BORDEWICK,  JR.,  STEPHEN E. CAVAN, W.
THOMAS LONDON,  ARNOLD D. SCOTT,  JEFFREY L. SHAMES,  and each of them,  proxies
with several powers of substitution,  to vote for the undersigned at the Special
Meeting of  Shareholders of VERTEX U.S. ALL CAP FUND, to be held at 500 Boylston
Street,  Boston,  Massachusetts,  on  Wednesday,  August 25,  1999 at 9:30 a.m.,
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. THE PROPOSALS HAVE BEEN PROPOSED BY THE BOARD OF
TRUSTEES.  IF NO  DIRECTION IS GIVEN ON THE  PROPOSALS,  THIS PROXY CARD WILL BE
VOTED  "FOR"  ITEMS 1 AND 2. THE  PROXY  WILL BE VOTED  IN  ACCORDANCE  WITH THE
HOLDER'S BEST JUDGMENT AS TO ANY OTHER MATTER.


         PLEASE VOTE AND SIGN AND RETURN PROMPTLY IN ENCLOSED ENVELOPE.


Please sign this proxy  exactly as your name  appears.  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.

         PLEASE MARK VOTES
         AS IN THIS EXAMPLE

1.)      NEW ADVISORY AGREEMENT WITH            For        Against      Abstain
         VERTEX INVESTMENT MANAGEMENT, INC.
                                                ------     ------       ------


2.)      RATIFICATION OF
         SELECTION OF ACCOUNTANTS               ______     ______       ______




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



Shareholder sign here____________________   Co-owner sign here:________________




Mark Line at right if comments or address change
have been noted on the reverse side of this card.             ______





<PAGE>


        THIS PROXY IS SOLICITED AND ON BEHALF OF THE BOARD OF TRUSTEES OF
                             VERTEX CONTRARIAN FUND
         Proxy for the Special Meeting of Shareholders, August 25, 1999

The undersigned  hereby appoints JAMES R. BORDEWICK,  JR.,  STEPHEN E. CAVAN, W.
THOMAS LONDON,  ARNOLD D. SCOTT,  JEFFREY L. SHAMES,  and each of them,  proxies
with several powers of substitution,  to vote for the undersigned at the Special
Meeting of  Shareholders of VERTEX  CONTRARIAN  FUND, to be held at 500 Boylston
Street,  Boston,  Massachusetts,  on  Wednesday,  August 25,  1999 at 9:30 a.m.,
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. THE PROPOSALS HAVE BEEN PROPOSED BY THE BOARD OF
TRUSTEES.  IF NO  DIRECTION IS GIVEN ON THE  PROPOSALS,  THIS PROXY CARD WILL BE
VOTED  "FOR"  ITEMS 1 AND 2. THE  PROXY  WILL BE VOTED  IN  ACCORDANCE  WITH THE
HOLDER'S BEST JUDGMENT AS TO ANY OTHER MATTER.


         PLEASE VOTE AND SIGN AND RETURN PROMPTLY IN ENCLOSED ENVELOPE.


Please sign this proxy  exactly as your name  appears.  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.

         PLEASE MARK VOTES
         AS IN THIS EXAMPLE

1.)      NEW ADVISORY AGREEMENT WITH            For        Against      Abstain
         VERTEX INVESTMENT MANAGEMENT, INC.
                                               ------     ------       ------


2.)      RATIFICATION OF
         SELECTION OF ACCOUNTANTS              ______     ______       ______




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




Shareholder sign here___________________  Co-owner sign here:_________________




Mark Line at right if comments or address change
have been noted on the reverse side of this card.             ______



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