MFS SERIES TRUST I
DEFS14A, 1997-10-20
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<PAGE>
                             MFS NEW DISCOVERY FUND
                   500 Boylston Street, Boston, Massachusetts 02116



                         Notice of Special Meeting of Shareholders
                               To be held October 30, 1997


A Special Meeting of Shareholders of MFS New Discovery Fund (the "Fund") will be
held at 500 Boylston Street,  Boston,  Massachusetts,  on Thursday,  October 30,
1997 at 9:30 a.m. for the following purposes:

ITEM 1.       To  approve  a  new  Investment   Advisory  Agreement  between
              Massachusetts  Financial  Services  Company  ("MFS") and the Fund,
              pursuant to which the  investment  management fee paid by the Fund
              to MFS would be increased from 0.75% per annum to 0.90% per annum.

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 as of October 15, 1997 will be entitled to vote at
the Special Meeting of Shareholders and at any adjournments thereof.




                                                   STEPHEN E. CAVAN, SECRETARY


October 20, 1997






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.


<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 I (the "Trust") on behalf of MFS New Discovery 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 October 30, 1997, 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 October 20, 1997.  All
properly executed proxies received in time for the Special Meeting will be voted
as  specified  on 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  as of October  15,  1997 (the
"Record  Date") will be  entitled  to one vote for each share  held.  There were
160,090.04 shares of the Fund outstanding on the Record Date.

The Fund  commenced  investment  operations  in January,  1997 and completed its
first  fiscal year of  operation  on August 31,  1997.  Accordingly,  the Fund's
Annual  Report is not  available  at this  time.  For a free copy of the  Fund's
Semi-Annual  Report dated February 28, 1997,  write or call MFS Service  Center,
Inc., 500 Boylston Street, Boston, Massachusetts 02116 or (800) 225-2606.

ITEM 1  TO APPROVE A NEW INVESTMENT ADVISORY AGREEMENT BETWEEN  MASSACHUSETTS
        FINANCIAL SERVICES COMPANY AND THE FUND

BACKGROUND

The Fund has  retained  Massachusetts  Financial  Services  Company,  a Delaware
corporation ("MFS" or the "Adviser"),  to provide it with investment  management
services pursuant to an Investment Advisory Agreement dated January 2, 1997 (the
"Current Agreement").

Pursuant to the Current Agreement, MFS provides the Fund with overall investment
management  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 Current Agreement,  computed and paid monthly,  in an amount equal
to 0.75% of the average daily net assets of the Fund on an annualized basis.

At the Special Meeting,  shareholders of the Fund will be asked to approve a new
Investment  Advisory  Agreement  (the "New  Agreement"),  pursuant  to which the
investment  management fee paid by the Fund to MFS would be increased from 0.75%
to 0.90% of the Fund's average daily net assets on an annualized basis. This fee
increase is the only material  difference  between the Current Agreement and the
New Agreement.  A description of the New Agreement and the services  provided by
MFS thereunder is set forth below.

                                        1
<PAGE>

In approving the New 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 New Agreement.

The Current  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 December 11, 1996, and by MFS, as
sole  shareholder  of the Fund, on January 2, 1997. On January 2, 1997,  MFS was
retained  by the Fund to serve  as its  investment  adviser  under  the  Current
Agreement. The New Agreement was approved by the Board of Trustees,  including a
majority of the Independent Trustees, on October 8, 1997, subject to shareholder
approval.

EFFECT OF AN INCREASE IN THE MANAGEMENT FEE

The effect of the proposed  increase in the Fund's  management fee from 0.75% to
0.90% per annum is  illustrated  below.  For the fiscal  period ended August 31,
1997 (the Fund  commenced  investment  operations  on  January  2,  1997),  this
information illustrates the amount the Fund paid to MFS under the present fee of
0.75% per annum, and the amount the Fund would have paid to MFS had the proposed
fee of 0.90% per annum  been in effect  for the  entire  period.  MFS waived its
right to receive  investment  management  fees from the Fund during this period;
therefore, the Fund did not, in fact, incur any management fees for this period.

                        Period ended August 31, 1997
           (commencement of investment operations on January 2, 1997)

                       % of Average
                     Daily Net Assets        Amount of Fee          % Change

Management Fee
     Present Fee          0.75%               $  8,539
     Proposed Fee         0.90%                 10,247
     Difference           0.15%               $  1,708                20.0%

In addition to its provision of investment  management services to the Fund, MFS
provides   administrative  services  to  the  Fund  for  which  it  received  an
administrative  services fee from the Fund of $132  (equivalent on an annualized
basis  to  0.015%  of the  Fund's  average  daily  net  assets)  for the  period
commencing  March 1, 1997 (when the fee was first  imposed)  through  August 31,
1997.  MFS Service  Center,  Inc.  ("MFSC"),  a wholly owned  subsidiary of MFS,
provides  shareholder  agency  services to the Fund.  The Fund pays MFS 0.13% of
it's average  daily net assets for these  services;  however for the period from
the commencement of investment  operations on January 2, 1997 through August 31,
1997, MFSC did not impose this fee.

Shown below is a chart of the  expenses  and fees the Fund  incurred  during its
fiscal  period  ended  August  31,  1997.  Due to the fee  waivers  and  expense
limitations  in place for the Fund,  these expenses and fees are the same as the
expenses  and  fees the Fund  would  have  incurred  if the  proposed  increased
management  fee had been in effect for this period (for  information  as to what
these fees and  expenses  would have been  absent  these fee waivers and expense
limitations, see Footnotes 2 and 5 to the Expense Summary table below).

                                        2
<PAGE>

EXPENSE SUMMARY
<TABLE>
<CAPTION>
<S>                                                            <C>                <C>           <C>           <C>
Shareholder Transaction Expenses:                              Class A            Class B       Class C       Class I
         Maximum Initial Sales Charge Imposed
              on Purchases of Fund Shares (as a
              percentage of offering price)                    4.75%              0.00%         0.00%          0.00%
         Maximum Contingent Deferred Sales
              Charge (as a percentage of
              original purchase price or redemption
              proceeds, as applicable)                      See Below(1)          4.00%         1.00%          None
</TABLE>
Annual Operating Expenses (as a percentage of average daily net assets):
<TABLE>
<CAPTION>
         <S>                                                    <C>               <C>           <C>           <C>
                                                                Class A           Class B       Class C       Class I
         Management Fees (after fee
              reduction) (2)                                   0.00%              0.00%         0.00%          0.00%
         Rule 12b-1 Fees (after fee
              reduction)                                       0.00%(3)           1.00%(4)      1.00%(4)       None
         Other Expenses (after fee
              reduction)(5)(6)                                 1.50%              1.50%         1.50%          1.50%
         Total Operating Expenses
              (after fee reduction)(5)                         1.50%              2.50%         2.50%          1.50%
</TABLE>
- ------------------------------------
(1)      Purchases  of $1 million or more and certain  purchases  by  retirement
         plans are not subject to an initial sales charge; however, a contingent
         deferred sales charge  ("CDSC") of 1% will be imposed on such purchases
         in the  event of  certain  redemption  transactions  within  12  months
         following such purchases.
   
(2)      The Adviser is currently waiving its right to receive  management fees.
         Absent this  waiver,  "Management  Fees" would be 0.75% per annum under
         the Current Agreement and 0.90% per annum under the New Agreement.  The
         0.90% per annum management fee will be imposed  commencing  November 1,
         1997, assuming that shareholders approve the New Agreement.
    
(3)      The Fund has  adopted  a  Distribution  Plan for its  Class A shares in
         accordance with Rule 12b-1 under the Investment Company Act of 1940, as
         amended (the "1940 Act") (the "Distribution Plan"), which provides that
         it will  pay  distribution/service  fees  aggregating  up to  (but  not
         necessarily  all of) 0.50% per annum of the  average  daily net  assets
         attributable to Class A shares. Distribution and service fees under the
         Class A  Distribution  Plan are  currently  being  waived;  however,  a
         distribution/service  fee of 0.35% per annum will be imposed commencing
         November 1, 1997.  Distribution  expenses paid under the Plan, together
         with the initial sales charge, may cause long-term  shareholders to pay
         more than the maximum sales charge that would have been  permissible if
         imposed entirely as an initial sales charge.
(4)      The Fund has adopted a Distribution Plan for Class B shares and Class C
         shares in accordance with Rule 12b-1 under the 1940 Act, which provides
         that it will pay  distribution/service  fees aggregating up to (but not
         necessarily  all of) 1.00% per annum of the  average  daily net  assets
         attributable to Class B shares under the Class B Distribution  Plan and
         Class C  shares,  respectively  under the  Class C  Distribution  Plan.
         Distribution  expenses paid under the Distribution  Plans, with respect
         to Class B or Class C  shares,  together  with  any CDSC  payable  upon
         redemption  of  Class  B  and  Class  C  shares,  may  cause  long-term
         shareholders  to pay more than the maximum sales charge that would have
         been permissible if imposed entirely as an initial sales charge.
(5)      "Other  Expenses"  are based on estimates of payments to be made during
         the Fund's current fiscal year. The Adviser is bearing certain expenses
         of the Fund,  subject to  reimbursement  by the Fund,  such that "Other
         Expenses" do not exceed 1.50% per annum of the Fund's average daily net
         assets  during the current  fiscal  year and each  fiscal year  through
         August 31, 2006.  This  arrangement may be terminated by the Adviser at
         any time. Otherwise, "Other Expenses" for Class A, Class B, Class C and
         Class I shares  would be 1.73% per annum.  Absent any fee  waivers  and
         reductions,  "Total  Operating  Expenses" for Class A, Class B, Class C
         and  Class  I  shares   would  be  2.98%,   3.48%,   3.48%  and  2.48%,
         respectively,  under the Current Agreement,  and 3.13%, 3.63%, 3.63 and
         2.63%, respectively, under the New Agreement.
 (6)     The Fund has an expense  offset  arrangement  which  reduces the Fund's
         custodian fee based upon the amount of cash maintained by the Fund with
         its custodian and dividend  disbursing  agent, and may enter into other
         such arrangements and 

                                        3
<PAGE>
         directed brokerage arrangements (which would also have the effect of
         reducing  the  Fund's  expenses).  Any  such fee reductions are not 
         reflected under "Other Expenses."

                                  EXAMPLE OF EXPENSES

An  investor  would pay the  following  dollar  amounts of  expenses on a $1,000
investment in the Fund,  assuming (a) a 5% annual return and,  unless  otherwise
noted, (b) redemption at the end of each of the time periods indicated:
<TABLE>
<CAPTION>
<S>                          <C>                  <C>                  <C>                 <C>
                             Class A              Class B              Class C             Class I
                                                           (1)                   (1)
1 year                         $62            $65        $25        $35       $25            $15
3 years                        $93            $108       $78        $78       $78            $47
</TABLE>

- ----------------------------
 (1)     Assumes no redemption.

Because of the  expense  waivers and  limitations  described  above,  the dollar
amount of expenses  would be the same for the Fund's fiscal period ending August
31, 1997 had the proposed management fee been in effect.

The purpose of the expense table above is to assist  investors in  understanding
the  various  costs  and  expenses  that a  shareholder  of each  Fund will bear
directly or indirectly.

The "Example" set forth above should not be considered a representation  of past
or future expenses of a Fund;  actual expenses may be greater or less than those
shown.

FEES OF SIMILAR MFS FUNDS

MFS  also  acts as the  investment  adviser  to  several  registered  investment
companies having similar investment objectives to those of the Fund.
   
The table in Appendix A sets forth the name of each  investment  company managed
by MFS having similar investment objectives to the Fund that primarily invest in
equity securities of domestic companies,  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 of such Fund as of August  31,  1997.  While  these  funds  have
similar investment objectives to the Fund, none of these funds follow the Fund's
policy of seeking to maintain a weighted median  capitalization of $2 billion or
less. MFS provides  administrative services to these funds under the terms of an
administrative  services  agreement  providing for a maximum fee equal to 0.015%
per annum.
    
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  $64.0 billion on behalf of over 2.6 million investor  accounts as
of August 31, 1997. MFS is a subsidiary of Sun Life Assurance  Company of Canada
(U.S.) ("Sun Life of Canada  (U.S.)") which in turn is an indirect  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 

                                        4
<PAGE>
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.

James R.  Bordewick,  Jr.,  Stephen E. Cavan,  W. Thomas London,  James O. Yost,
Ellen M. Moynihan and Mark E. Bradley, 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.

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

Broker-dealers may be willing to furnish statistical, research and other factual
information  or services  ("Research")  to MFS for no  consideration  other than
brokerage or  underwriting  commissions.  Securities  may be bought or sold from
time to time through such broker-dealers on behalf of the Fund.

The Board (together with the Boards of the other MFS Funds) have directed MFS to
allocate  a total of $39,100 of  commission  business  from the Fund and the MFS
Funds  to  the  Pershing   Division  of   Donaldson,   Lufkin  and  Jenrette  as
consideration for the annual renewal of certain publications  provided by Lipper
Analytical  Securities  Corporation  (which provides  information  useful to the
Board in reviewing the relationship between the Fund and MFS).

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

REVIEW PROCESS OF THE BOARD OF TRUSTEES
   
At the  request of MFS,  the Board of  Trustees  discussed  approval  of the New
Agreement at a meeting held on October 8, 1997. In evaluating the Agreement, the
Board of Trustees reviewed materials furnished by MFS.

In approving the proposed  increase in management  fees (as reflected in the New
Agreement)  and in  unanimously  recommending  this  higher fee for  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.  The
principal  factors  considered by the Trustees were the expenses incurred by MFS
in managing a portfolio of securities issued by small  capitalization  companies
and the fact that the proposed  management fee is

                                        5
    
<PAGE>
   
competitive with fees charged by other advisers for the management of similar
small capitalization portfolios. The Trustees gave equal weight to each of these
factors.
    
The Fund seeks to maintain weighted median capitalization of $2 billion or less,
and   consequently   will  invest  primarily  in  companies  with  small  market
capitalization relative to companies included in the Standard & Poor's 500 Stock
Index.  MFS'  investment  style  is  to  choose  portfolio  investments  through
intensive  analytical  research,  rather than through  quantitative  analysis or
other methods.  MFS retains a group of investment  research analysts who closely
follow the  companies in which the funds advised by MFS invest.  In  considering
whether to approve  the  proposed  management  fee  increase  for the Fund,  the
Trustees  took into account the fact that MFS has devoted,  and will continue to
devote,  substantial  resources  to its  research  efforts with respect to small
capitalization companies, and that these efforts result in increased expenses to
MFS in providing these services to the Fund.

In  addition,  the  Trustees  took into  account a  comparison  of the  proposed
contractual  management  fee  with  fees  charged  by  other  advisers  for  the
management  of small  capitalization  portfolios,  and found  that the  proposed
contractual  management fee was below the median fee charged by these  advisers.
The  Trustees  also  considered  the nature,  quality and scope of the  services
provided by MFS, and concluded that the proposed management fee is reasonable in
light of the  comparative  fee  information,  MFS'  expenses in  managing  small
capitalization portfolios and the nature, quality and scope of services provided
by MFS to the Fund.

DESCRIPTION OF THE NEW AGREEMENT

As noted above, the Current Agreement and the New Agreement are identical except
that the New  Agreement  provides for the payment by the Fund to MFS of a higher
management  fee of 0.90% per annum,  rather  than the  current  fee of 0.75% per
annum (the New Agreement also has a new commencement date and termination date).
Under the New  Agreement,  MFS provides  portfolio  management  services for the
Fund, including investment research, advice and supervision.

The Fund pays its expenses (other than those assumed by MFS or 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 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  portfolio  management  services,  including office space,
equipment, clerical personnel, investment advisory facilities, and all executive
and  supervisory  personnel  necessary for managing the Fund's  investments  and
effecting transactions in its portfolio securities.

                                        6
<PAGE>
The New 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 New Agreement will remain in effect  pursuant to its terms until October 30,
1999 (for the Current  Agreement,  this date is January 2, 1999), 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 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 New
Agreement  is  terminable,  without  penalty,  by the  Board of  Trustees,  by a
Majority  Vote of the Fund's  shareholders  or 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 New  Agreement  terminates  automatically  in the  event  of its
assignment (as defined in the 1940 Act).

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

REQUIRED VOTE

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

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


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.

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 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.

                                        7     
<PAGE>

ADDITIONAL INFORMATION

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

The First National Bank of Boston,  Trustee for IRA R/O Ned Rigsbee,  Boston, MA
and the MFS Defined  Contribution  Plan, 500 Boylston Street,  Boston, MA, owned
approximately 12.59% and 74.55%,  respectively,  of the shares of the Fund as of
October 15, 1997.

In the event that  sufficient  votes in favor of the  proposal  set forth in the
Notice of Special  Meeting are not  received by October  30,  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 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 MFS.

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 MFS. MFS
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






October 20 , 1997                                        MFS New Discovery Fund

                                        8
<PAGE>
                                                                     APPENDIX A
                    SIMILAR INVESTMENT COMPANIES ADVISED BY MFS
<TABLE>
<CAPTION>
             <S>                           <C>                          <C>                    <C>                      <C>
                                                                                               Annual Rate of           Fees Waived
             Name of Fund                  Investment Objective         Net Assets              Compensation          or Reduced To

Massachusetts Investors Trust          Long-term Capital Growth     $5,017,499,275     0.30% of first $200M           No
                                                                                       0.24% of next $300M
                                                                                       0.12% in excess of $500M

Massachusetts Investors Growth         Long-term Capital Growth     $1,677,690,241     0.50% of first $200M           No
  Stock Fund                                                                           0.40% of next $300M
                                                                                       0.20% in excess of $500M

MFS Blue Chip Fund                     Capital Appreciation         $      727,489     0.65%                          0.00%

Capital Appreciation Series            Capital Appreciation         $1,290,632,877     0.75% of first $1B             No
                                                                                       0.675% of next $500M
                                                                                       0.65% in excess of $1.5B

Capital Appreciation Variable Acct.    Capital Appreciation         $   632,165,393    0.75% of first $300M           No
                                                                                       0.675% in excess of $300M

Conservative Growth Series             Long-term Capital Growth     $   926,799,243    0.55%                          No

MFS Core Growth Fund                   Capital Appreciation         $     2,757,143    0.75%                          0.00%

MFS Emerging Growth Fund               Long-term Capital Growth     $ 8,578,702,895    0.75% of first $2.5B           No
                                                                                       0.70% of next $4.5B
                                                                                       0.65% in excess of $7B

MFS Emerging Growth Series             Long-term Capital Growth     $   302,903,022    0.75%                          No

Emerging Growth Series                 Long-term Capital Growth     $   387,964,082    0.75% of first $300M           No
                                                                                       0.675% in excess of $300M

MFS Growth Opportunities Fund          Capital Growth               $   952,113,677    0.50% of first $200M           No
                                                                                       0.40% in excess of $200M

MFS Institutional Emerging Equities    Long-term Capital Growth     $   383,751,697    0.75%                          No
  Fund

MFS Institutional Mid-Cap Growth       Long-term Capital Growth     $    26,619,145    0.60%                          No
  Equity Fund

MFS Large Cap Growth Fund              Capital Growth               $   641,057,624    0.75% of first $1B             No
                                                                                       0.65% in excess of $1B

MFS Managed Sectors Fund               Capital Appreciation         $   446,064,516    0.75%                          No

Managed Sectors Series                 Capital Appreciation         $   329,900,679    0.75% of first $300M           No
                                                                                       0.675% in excess of $300M

Managed Sectors Variable Account       Capital Appreciation         $   121,447,332    0.75% of first $300M           No
                                                                                       0.675% in excess of $300M

MFS Mid Cap Growth Fund                Long-term Capital Growth     $   122,510,691    0.75%                          No

MFS Research Fund                      Long-term Capital Growth     $ 4,176,067,395    On Average Net Assets:         No
                                                                                       0.40% of first $100M
                                                                                       0.32% of next $400M
                                                                                       0.288% in excess of $500M
                                                                                                       plus
                                                                                       On Gross Income:
                                                                                       5.0% of first $2M
                                                                                       4.0% of next $8M
                                                                                       3.6% in excess of $10M

MFS Research Series                    Long-term Capital Growth     $   241,756,218    0.75%                          No

MFS Institutional Research Fund        Long-term Capital Growth     $    44,141,053    0.60%                          No

Research Series                        Long-term Capital Growth     $   563,233,099    0.75% of first $300M           No
                                                                                       0.675% in excess of $300M

MFS Science & Technology Fund          Capital Appreciation         $     2,518,751    0.75%                          0.00%

MFS Special Opportunities Fund         Capital Appreciation         $     3,939,672    0.75%                          0.00%

</TABLE>

                                        9
<PAGE>
<TABLE>
<CAPTION>
             <S>                           <C>                           <C>                   <C>                     <C>
                                                                                               Annual Rate of          Fees Waived
             Name of Fund                  Investment Objective          Net Assets             Compensation          or Reduced To


MFS Strategic Growth Fund              Capital Appreciation         $    56,243,040    0.75%                          No

MFS Utilities Fund                     Capital Growth               $   182,081,128    0.375% of Average Net          0.50%
                                                                                       Assets; 6.25% Income

MFS Utilities Series                   Capital Growth               $    20,000,035    0.75%                          No

Utilities Series                       Capital Growth               $    92,740,341    0.75% of first $300M           No
                                                                                       0.675% in excess of $300M

MFS Union Standard Equity Fund         Long-term Capital Growth     $    65,095,081    0.65%                          No

MFS Value Fund                         Capital Appreciation         $ 1,033,403,871    0.75%                          No

MFS Value Series                       Capital Appreciation         $     5,837,260    0.75%                          No

Value Series                           Capital Appreciation         $    57,492,602    0.75% of first $300M           No
                                                                                       0.675% in excess of $300M
</TABLE>

                                        10
<PAGE>
                                                                   APPENDIX B


                            INVESTMENT ADVISORY AGREEMENT


         INVESTMENT ADVISORY AGREEMENT, dated this 30th day of October, 1997, by
and between MFS SERIES TRUST I, a Massachusetts business trust (the "Trust"), on
behalf  of MFS NEW  DISCOVERY  FUND,  a series of the Trust  (the  "Fund"),  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 this Investment  Advisory Agreement was approved by the Trust's
Board of Trustees on October 8, 1997, and by shareholders of the Fund on October
30, 1997; 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  December 14, 1994, 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
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 

                                        11
<PAGE>
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 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  provided,  the Fund shall pay to the Adviser an  investment
advisory  fee  computed and paid monthly at an annual rate equal to 0.90% 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 Article 3,
the compensation to the Adviser 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
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-

                                        12
<PAGE>
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 to 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 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  October  30,  1999 on  which  date it will  terminate  unless  its
continuance after October 30, 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  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
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," 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.

                                        13
<PAGE>

         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 I on
                                        behalf of MFS NEW
                                        DISCOVERY  FUND, one of its
                                        series



                                      By:______________________
                                          A. Keith Brodkin
                                          Chairman and Trustee



                                      MASSACHUSETTS FINANCIAL
                                        SERVICES COMPANY



                                      By:_______________________
                                          Jeffrey L. Shames
                                          President

                                        14
<PAGE>
     THIS PROXY IS SOLICITED BY AND ON BEHALF OF THE BOARD OF TRUSTEES OF
                          MFS(R) NEW DISCOVERY FUND
           Proxy for the Special Meeting of Shareholders, October 30, 1997

The undersigned  hereby appoints JAMES R. BORDEWICK,  JR.,  STEPHEN E. CAVAN, W.
THOMAS LONDON, 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  NEW  DISCOVERY  FUND,  to be  held  at  500  Boylston  Street,  Boston,
Massachusetts,  on  Thursday,  October  30,  1997 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 PROPOSAL HAS BEEN PROPOSED BY THE BOARD OF
TRUSTEES.  IF NO  DIRECTION  IS GIVEN ON THE  PROPOSAL,  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 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.

  X   PLEASE MARK VOTES
      AS IN THIS EXAMPLE
   
1.)   TO APPROVE A NEW INVESTMENT ADVISORY             For     Against  Abstain
      AGREEMENT BETWEEN MASSACHUSETTS
      FINANCIAL SERVICES COMPANY ("MFS") AND          ______   _______   ______
      THE FUND, PURSUANT TO WHICH THE INVESTMENT
      MANAGEMENT FEE PAID BY THE FUND TO MFS
      WOULD BE INCREASED FROM 0.75% PER ANNUM TO
      0.90% PER ANNUM.
    
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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