MFS SERIES TRUST I
485BPOS, 1996-03-29
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     As filed with the Securities and Exchange Commission on March 29, 1996
    

                                                       1933 Act File No. 33-7638
                                                      1940 Act File No. 811-4777
===============================================================================

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

   
                              --------------------
                                    FORM N-1A
                             REGISTRATION STATEMENT
                                      UNDER
                           THE SECURITIES ACT OF 1933
                         POST-EFFECTIVE AMENDMENT NO. 23

                                       AND
                             REGISTRATION STATEMENT
                                      UNDER
                       THE INVESTMENT COMPANY ACT OF 1940
                                AMENDMENT NO. 25
    

                               MFS SERIES TRUST I
               (Exact Name of Registrant as Specified in Charter)

                500 Boylston, Street, Boston, Massachusetts 02116
                    (Address of Principal Executive Offices)

        Registrant's Telephone Number, Including Area Code: 617-954-5000
           Stephen E. Cavan, Massachusetts Financial Services Company,
                500 Boylston Street, Boston, Massachusetts 02116
                     (Name and Address of Agent for Service)

                  APPROXIMATE DATE OF PROPOSED PUBLIC OFFERING:
  It is proposed that this filing will become effective (check appropriate box)

   
          |_| immediately upon filing pursuant to paragraph (b)
          |X| on March 29,1996 pursuant to paragraph (b)
          |_| 60 days after filing pursuant to paragraph (a)(i)
          |_| on [date] pursuant to paragraph (a)(i)
          |_| 75 days after filing pursuant to paragraph (a)(ii)
          |_| on [date] pursuant to paragraph (a)(ii) of rule 485.
    

          If appropriate, check the following box:
          |_| this post-effective amendment designates a new effective date for 
              a previously filed post-effective amendment

Pursuant to Rule 24f-2, the Registrant has registered an indefinite number of
its shares of Beneficial Interest (without par value), under the Securities Act
of 1933. The Registrant filed a Rule 24f-2 Notice for its fiscal year ended
August 31, 1995 on October 30, 1995.

==============================================================================
<PAGE>

   
The Prospectus dated January 1, 1996 of MFS Cash Reserve Fund is incorporated in
this Post-Effective Amendment No. 23 by reference to the Prospectus of MFS Cash
Reserve Fund filed via EDGAR by the Registrant pursuant to the Rule 497 under
the Securities Act of 1933, as amended, with the Securities and Exchange
Commission on January 4, 1996.
    

<PAGE>
   
                            MFS CASH RESERVE FUND
SUPPLEMENT TO THE PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION DATED
                               JANUARY 1, 1996

    THE FOLLOWING INFORMATION SHOULD BE READ IN CONJUNCTION WITH THE FUND'S
PROSPECTUS AND STATEMENT OF ADDITIONAL INFORMATION ("SAI") DATED JANUARY 1,
1996 AND CONTAINS A DESCRIPTION OF CLASS C SHARES. CAPTIONS CONTAINED IN THIS
SUPPLEMENT CORRESPOND TO THE CAPTIONS CONTAINED IN THE PROSPECTUS.

EXPENSE SUMMARY

<TABLE>
<CAPTION>
SHAREHOLDER TRANSACTION EXPENSES:                                  CLASS A             CLASS B             CLASS C
                                                                   -------             -------             -------
<S>                                                                 <C>                 <C>                 <C>
Maximum Initial Sales Charge Imposed on Purchases of Fund
  Shares (as a percentage of offering price) ................        None               None                None
Maximum Contingent Deferred Sales Charge (as a percentage of
  original purchase price or redemption proceeds, as                 None               4.00%               1.00%
ANNUAL OPERATING EXPENSES OF THE FUND (AS A PERCENTAGE OF
  AVERAGE NET ASSETS):
Management Fees (after applicable fee reduction) (1) ........       0.45%               0.45%               0.45%
Rule 12b-1 Fees .............................................       0.00%(2)            1.00%(3)            1.00%(3)
Other Expenses(4) ...........................................       0.45%               0.48%               0.45%(5)
                                                                    ------              ------              ------
Total Operating Expenses (after applicable fee reduction)(4)        0.90%               1.93%               1.90%

<FN>
- ----------
(1)       The Adviser has voluntarily agreed to reduce its advisory fee to 0.45% per annum of the Fund's average
          daily net assets. This fee reduction may be rescinded at any time without notice to shareholders.
          Absent this reduction, management fees would be 0.55%.
(2)       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"), which provides that it will pay
          distribution/service fees aggregating up to (but not necessarily all of) 0.35% per annum of the average
          daily net assets attributable to the Class A shares (see "Distribution Plans" in the Prospectus).
          Payment of the 0.25% per annum service fee will commence on the date that the value of the net assets
          of the Fund attributable to Class A shares first equals or exceeds $40 million. Payment of the 0.10%
          per annum distribution fee will commence on such date as the Trustees of the Trust may determine.
          Distribution expenses paid under this Plan 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.
(3)       The Fund has adopted separate Distribution Plans for its Class B and its Class C shares in accordance
          with Rule 12b-1 under the 1940 Act, which provide that the Fund 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 the Class B shares under the Class B Distribution Plan and Class C shares under the
          Class C Distribution Plan (see also "Distribution Plans" below and in the Prospectus). Distribution
          expenses paid under these Plans, together with any contingent deferred sales charge (the "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.
(4)       The Fund has an expense offset arrangement which reduces the Fund's custodian fee based upon the amount
          of cash maintained by the Fund with its custodian and dividend disbursing agent, and may enter into
          other such arrangements and directed brokerage arrangements (which would also have the effect of
          reducing the Fund's expenses). Any such fee reductions are not reflected under "Other Expenses."
(5)       Except for the shareholder servicing agent fee component, "Other Expenses" is based on Class A expenses
          incurred during the fiscal year ended August 31, 1995. The shareholder servicing agent fee component of
          "Other Expenses" is a predetermined percentage based upon the Fund's net assets attributable to each
          class.
(6)       Absent the fee reduction, "Total Operating Expenses" for Class A, Class B and Class C shares would have
          been 1.00%, 2.03% and 2.00%, respectively.
</TABLE>
<PAGE>

                             EXAMPLE OF EXPENSES

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

  PERIOD           CLASS A             CLASS B                   CLASS C
  ------           -------        ------------------         ---------------
                                               (1)                       (1)
  1 year ......     $  9          $ 60        $ 20           $31         $21
  3 years .....       29            91          61            66          66
  5 years .....       50           124         104
  10 years ....      111           199(2)      199(2)

- ----------
(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.

    The purpose of the expense table above is to assist investors in
understanding the various costs and expenses that a shareholder of the Fund will
bear directly or indirectly. More complete descriptions of the following Fund
expenses are set forth in the following sections of the Prospectus: (i) varying
CDSCs - "Purchases"; (ii) management fees - "Investment Adviser" and
(iii) Rule 12b-1 (i.e., distribution plan) fees - "Distribution Plans."

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

THE FUND
    Three classes of shares of the Fund currently are offered to the general
public. Class A shares are offered at net asset value and are subject to an
annual distribution fee and service fee up to a maximum of 0.35% per annum.
Class B shares are offered at net asset value without an initial sales charge
but are subject to a CDSC upon redemption (declining from 4.00% during the first
year to 0% after six years) and an annual distribution fee and service fee up to
a maximum of 1.00% per annum; Class B shares will convert to Class A shares
approximately eight years after purchase. Class C shares are offered at net
asset value without an initial sales charge but are subject to a CDSC of 1.00%
upon redemption during the first year and an annual distribution fee and service
fee up to a maximum of 1.00% per annum. Class C shares do not convert to any
other class of shares of the Fund.

INFORMATION CONCERNING SHARES OF THE FUND
PURCHASES
    The Fund offers three classes of shares which bear sales charges and
distribution fees in different forms and amounts. Class A and Class B shares are
described in the Prospectus and SAI, and Class C shares are described below.

    Class C shares are offered at net asset value without an initial sales
charge but are subject to a CDSC of 1.00% upon redemption during the first year.
The maximum investment in Class C shares is $1,000,000 per transaction.

    The CDSC imposed is assessed against the lesser of the value of the shares
redeemed (exclusive of reinvested dividend and capital gain distributions) or
the total cost of such shares. No CDSC is assessed against shares acquired
through the automatic reinvestment of dividend or capital gain distributions. In
certain circumstances, the CDSC imposed upon redemption of Class C shares is
waived. Circumstances under which sales charges imposed on Class B shares are
waived are described in the Prospectus. The CDSC imposed upon redemption of
Class C shares is waived in the same circumstances that apply to the waiver of
the Class B CDSC. See "Redemptions and Repurchases - Contingent Deferred Sales
Charge" below for further discussion of the CDSC.

    MFD will pay dealers 1.00% of the purchase price of Class C shares
purchased through dealers and, as compensation therefor, MFD will retain the
1.00% per annum distribution and service fee paid under the Class C
Distribution Plan by the Fund to MFD for the first year after purchase (see
"Distribution Plans" below). In addition, MFD or its affiliates may from time
to time pay dealers an additional commission equal to 0.50% of the net asset
value of all Class C shares sold by such dealer during the sales period.

    Class C shares are not currently available for purchase by any retirement
plan qualified under Section 401(a) or 403(b) of the Internal Revenue Code of
1986, as amended (the "Code"), if the retirement plan and/or the sponsoring
organization subscribe to the MFS FUNDamental 401(k) Plan or another similar
recordkeeping program made available by the Shareholder Servicing Agent.

EXCHANGES
    Some or all of the Class C shares in an account with the Fund for which
payment has been received by the Fund (i.e., an established account) may be
exchanged for Class C shares of any other fund in the MFS Family of Funds (the
"MFS Funds") at net asset value (if available for sale). No CDSC will be
imposed in connection with an exchange from Class C shares of the Fund to any
other MFS Fund, however the holding period for purposes of calculating the
CDSC will carry over to the acquired shares.

    Prior to April 1, 1996, Class C shares of the MFS Funds were exchangeable
for shares of the MFS Money Market Fund at net asset value. Effective April 1,
1996, Class C shares of the MFS Funds may no longer be exchanged for shares of
the MFS Money Market Fund. However, Class C shares of the Fund are available
for such exchanges effective April 1, 1996.

REDEMPTIONS AND REPURCHASES
    REDEMPTION BY CHECK: Class C shares may be redeemed by check. The Fund's
Prospectus describes the procedures applicable to redeeming Class A shares by
check. These procedures apply to redemptions by Class C shares by check.

    CONTINGENT DEFERRED SALES CHARGE: Investments in Class C shares made on or
after April 1, 1996 ("Direct Purchases") will be subject to a 1.00% CDSC upon
redemption for a period of 12 months. Purchases of Class C shares made during a
calendar month, regardless of when during the month the investment occurred,
will age one year at the close of business on the last day of such month in the
following calendar year. Prior to April 1, 1996, Class C shares of the MFS Funds
were not subject to a CDSC upon redemption. In no event will Class C shares of
the MFS Funds purchased prior to this date be subject to a CDSC. For the purpose
of calculating the CDSC upon redemption of shares acquired in an exchange on or
after April 1, 1996, the purchase of shares acquired in one or more exchanges is
deemed to have occurred at the time of the original purchase of the exchanged
shares (if such original purchase occurred prior to April 1, 1996, then no CDSC
would be imposed upon such a redemption).

    At the time of a redemption, the amount by which the value of a
shareholder's account represented by Direct Purchases exceeds the sum of 12
months of Direct Purchases may be redeemed without charge ("Free Amount").
Moreover, no CDSC is ever assessed on additional shares acquired through the
automatic reinvestment of dividend or capital gain distributions ("Reinvested
Shares"). Therefore, at the time of redemption of Class C shares, (i) any Free
Amount is not subject to the CDSC and (ii) the amount of the redemption equal to
the then-current value of Reinvested Shares is not subject to the CDSC, but
(iii) any amount of the redemption in excess of the aggregate of the then-
current value of Reinvested Shares and the Free Amount is subject to a CDSC.

    The applicability of a CDSC for Class C shares will be unaffected by
exchanges or transfers of registration, except as described in the Prospectus
for Class B shares.

    REINSTATEMENT PRIVILEGE: Class C shareholders of the Fund who have redeemed
their shares have a one-time right to reinvest the redemption proceeds in the
same class of shares of any of the MFS Funds (if shares of such Fund are
available for sale) at net asset value (with a credit for any CDSC paid) within
90 days of the redemption pursuant to the Reinstatement Privilege. If the Class
C shares credited for any CDSC paid are then redeemed within 12 months of the
initial purchase, a CDSC will be imposed upon redemption. Such purchases under
the Reinstatement Privilege are subject to all limitations in the SAI regarding
the privilege.

DISTRIBUTION PLANS
    The Trustees have adopted separate Distribution Plans for Class A, Class B
and Class C shares pursuant to Section 12(b) of the 1940 Act and Rule 12b-1
thereunder, after having concluded that there is a reasonable likelihood that
the Distribution Plans would benefit the Fund and its shareholders. The
Distribution Plans for Class A and Class B shares are described in the
Prospectus (see "Distribution Plans" therein). The Distribution Plan for Class C
shares is described below.

    The Class C Distribution Plan provides that the Fund may pay MFD a service
fee of up to 0.25% per annum of the average daily net assets attributable to
Class C shares in order that MFD may pay expenses on behalf of the Fund relating
to the servicing of Class C shares. The service fee is used by MFD to compensate
dealers which enter into a sales agreement with MFD in consideration for all
personal services and/or account maintenance services rendered by the dealer
with respect to Class C shares owned by investors for whom such dealer is the
dealer or holder of record. MFD may from time to time reduce the amount of
service fees paid for shares sold prior to a certain date. Service fees may be
reduced for a dealer that is the holder or dealer of record for an investor who
owns shares of the Fund having an aggregate net asset value at or above a
certain dollar level. Dealers may from time to time be required to meet certain
criteria in order to receive service fees. MFD or its affiliates are entitled to
retain service fees for which there is no dealer of record or for which
qualification standards have not been met as partial consideration for personal
services and/or account maintenance services performed by MFD or its affiliates
to shareholder accounts.

    The Class C Distribution Plan also provides that the Fund may pay MFD a
distribution fee equal to 0.75% per annum of the Fund's average daily net assets
attributable to Class C shares as partial consideration for distribution
services performed and expenses incurred in the performance of MFD's obligations
under its distribution agreement with the Fund. See "Management of the Fund -
Distributor" in the SAI. While the amount of compensation received by MFD in the
form of distribution fees during any year may be more or less than the expense
incurred by MFD under its distribution agreement with the Fund, the Fund is not
liable to MFD for any losses MFD may incur in performing services under its
distribution agreement with the Fund.

    As discussed under the caption "Purchases" above, Class C shares are offered
at net asset value without an initial sales charge but are subject to a CDSC of
1.00% upon redemption during the first year. MFD will pay a commission to
dealers of 1.00% of the purchase price of Class C shares purchased through
dealers at the time of purchase. In compensation for this 1.00% commission paid
by MFD to dealers, MFD will retain the 1.00% per annum distribution and service
fees paid by the Fund with respect to such shares for the first year after
purchase, and dealers will become eligible to receive from MFD the ongoing 1.00%
per annum distribution and service fees paid by the Fund to MFD with respect to
such shares commencing in the thirteenth month following purchase.

    Fees payable under the Class C Distribution Plan are charged to, and
therefore reduce, income allocated to Class C shares.

DISTRIBUTIONS
    Distributions paid by the Fund with respect to Class A shares will generally
be greater than those paid with respect to Class B and Class C shares because
expenses attributable to Class B and Class C shares will generally be higher.

DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES
    The Fund, one of eight series of MFS Series Trust I, has three classes of
shares entitled Class A, Class B and Class C Shares of Beneficial Interest
(without par value).

PERFORMANCE INFORMATION
    Yield and effective yield calculations for Class C shares assume no CDSC is
paid.

SHAREHOLDER SERVICES
INVESTMENT AND WITHDRAWAL PROGRAMS
    DISTRIBUTION INVESTMENT PROGRAM: Prior to April 1, 1996, distributions made
on Class C shares of the MFS Funds could be automatically invested under the
Distribution Investment Program in shares of the MFS Money Market Fund at net
asset value. Effective April 1, 1996, distributions made on Class C shares of
the MFS Funds may no longer be automatically invested under the Distribution
Investment Program in shares of the MFS Money Market Fund. However, effective
April 1, 1996, distributions made on Class C shares of the MFS Funds may be
automatically invested under this Program in Class C shares of the Fund.

SYSTEMATIC WITHDRAWAL PLAN:
    The aggregate withdrawals of Class C shares in any year pursuant to a
Systematic Withdrawal Plan ("SWP") will not be subject to a CDSC and generally
are limited to 10% of the value of the account at the time of establishment of
the SWP.

DOLLAR COST AVERAGING PROGRAMS
    AUTOMATIC EXCHANGE PLAN: Prior to April 1, 1996, Class C shares of the MFS
Funds were exchangeable under the Automatic Exchange Plan for shares of the MFS
Money Market Fund at net asset value. Effective April 1, 1996, Class C shares of
the MFS Funds may no longer be exchanged under the Automatic Exchange Plan for
shares of the MFS Money Market Fund. However, Class C shares of the Fund are
available for such exchanges effective April 1, 1996.

                 THE DATE OF THIS SUPPLEMENT IS APRIL 1, 1996
    
<PAGE>

   
The Statement of Additional Information dated January 1, 1996 of MFS Cash
Reserve Fund is incorporated in this Post-Effective Amendment No. 23 by
reference to the Statement of Additional Information of MFS Cash Reserve Fund
filed via EDGAR by the Registrant pursuant to the Rule 497 under the Securities
Act of 1933, as amended, with the Securities and Exchange Commission on January
4, 1996.
    
<PAGE>

   
The Annual Report to Shareholders dated August 31, 1995 to MFS Cash Reserve Fund
is incorporated in this Post-Effective Amendment No. 23 by reference to the
Annual Report to Shareholders filed with the Securities and Exchange Commission
via EDGAR on October 27, 1995.
    

<PAGE>
   
                                     PART C
                                     ------


ITEM 24.  FINANCIAL STATEMENTS AND EXHIBITS
          MFS CASH RESERVE FUND

    
         (A) FINANCIAL STATEMENTS INCLUDED IN PARTS A AND B:

   
               INCLUDED IN PART A OF THIS REGISTRATION STATEMENT:
                  For the year ended August 31, 1995, the nine months ended
                  August 31, 1994 and for seven years ended November 30, 1993:
                     Financial Highlights*

               INCLUDED IN PART B OF THIS REGISTRATION STATEMENT:
                  At August 31, 1995:
                     Portfolio of Investments*
                      Statement of Assets and Liabilities*

                  For the year ended August 31, 1995, the nine
                  months ended August 31, 1994 and for the year
                  ended November 30, 1993:
                       Statement of Changes in Net Assets*

                  For the year ended August 31, 1995:
                       Statement of Operations*
- -------------------------------------
*     Incorporated by reference to the MFS Cash Reserve Fund's Annual Report to
      Shareholders dated August 31, 1995, filed with the SEC on October 27,
      1995.

     
         (B) EXHIBITS

              1  (a) Amended and Restated Declaration of Trust, dated
                     January 6, 1995. (5)

                 (b) Amendment to Declaration of Trust, dated October 12, 1995.
                     (7)

   
                 (c) Amendment to Declaration of Trust, dated February 21, 1996;
                     filed herewith.
    

              2      Amended and Restated By-Laws dated December 14, 1994.  (5)

              3      Not Applicable.

              4      Form of Share Certificate for Class A, Class B and Class C
                     Shares. (2)

              5  (a) Investment Advisory Agreement for MFS(R) Cash Reserve
                     Fund, dated September 1, 1993. (7)

                 (b) Investment Advisory Agreement for MFS(R) Managed Sectors
                     Fund, dated September 1, 1993. (7)

                 (c) Investment Advisory Agreement for MFS(R) World Asset
                     Allocation Fund, dated June 2, 1994. (7)

   
                 (d) Investment Advisory Agreement for MFS(R) Equity Income
                     Fund, dated January 2, 1996; filed herewith.

                 (e) Investment Advisory Agreement for MFS(R) Research Growth
                     and Income Fund, dated January 2, 1996; filed herewith.

                 (f) Investment Advisory Agreement for MFS(R) Core Growth Fund,
                     dated January 2, 1996; filed herewith.

                 (g) Investment Advisory Agreement for MFS(R) Aggressive Growth
                     Fund, dated January 2, 1996; filed herewith.

                 (h) Investment Advisory Agreement for MFS(R) Special
                     Opportunities Fund, dated January 2, 1996; filed herewith.

    
               6 (a)   Distribution Agreement, dated January 1, 1995.  (5)

                 (b) Dealer Agreement between MFS Fund Distributors, Inc.,
                     ("MFD") and a dealer, dated December 28, 1994 and the
                     Mutual Fund Agreement between MFD and a bank or NASD
                     affiliate, dated December 28, 1994. (1)

               7     Retirement Plan for Non-Interested Person Trustees, dated
                     January 1, 1991. (7)

               8 (a) Custodian Agreement, dated January 28, 1988. (7)

                 (b) Amendment No. 1 to the Custodian Agreement, dated February
                     29, 1988 and October 1, 1989, respectively. (7)

                 (c) Amendment No. 2 to the Custodian Agreement, dated October
                     9, 1991. (7)

                 (d) Custodian Agreement between Investors Bank & Trust and
                     MFS(R) World Asset Allocation Fund dated June 2, 1994. (7)

               9 (a) Shareholder Servicing Agent Agreement, dated September
                     10, 1986. (6)

                 (b) Amendment to the Shareholder Servicing Agent Agreement,
                     dated June 2, 1994. (7)

                 (c) Exchange Privilege Agreement, dated September 1, 1995. (8)

                 (d) Loan Agreement by and among MFS Borrowers and The First
                     National Bank of Boston dated as of September 29, 1989, as
                     amended through and including the second Amendment dated
                     April 21, 1994. (3)

                 (e) Dividend Disbursing Agent Agreement dated September 10,
                     1986. (7)

   
              10 Consent and Opinion of Counsel filed with the Registrant's
                  24f-2 Notice for the fiscal year ended August
                  31, 1995 on October 30, 1995.

              11 (a) Consent of Deloitte & Touche LLP.  (9)

                 (b) Consent of Ernst & Young LLP.  (9)

    
              12 Not Applicable.

              13 Not Applicable.

              14 (a) Forms for Individual Retirement Account Disclosure
                     Statement as currently in effect.  (4)

                 (b) Forms for MFS 403(b) Custodial Account Agreement as
                     currently in effect. (4)

                 (c) Forms for MFS Prototype Paired Defined Contribution Plans
                     as Trust Agreement as currently in effect. (4)

              15 (a) Distribution Plan for Class A Shares of MFS(R) Managed
                     Sectors Fund, dated December 14, 1994. (5)

                 (b) Amended and Restated Distribution Plan for Class B Shares
                     of MFS(R) Managed Sectors Fund, dated December 14, 1994.
                     (5)

                 (c) Distribution Plan for Class A Shares of MFS(R) Cash Reserve
                     Fund, dated December 14, 1994. (5)

                 (d) Distribution Plan for Class B Shares of MFS(R) Cash Reserve
                     Fund, dated December 14, 1994. (5)

                 (e) Distribution Plan for Class A Shares of MFS(R) World Asset
                     Allocation Fund, dated December 14, 1994. (5)

                 (f) Distribution Plan for Class B Shares of MFS(R) World Asset
                     Allocation Fund, dated December 14, 1994. (5)

                 (g) Distribution Plan for Class C Shares of MFS(R) World Asset
                     Allocation Fund dated December 14, 1994. (5)

   
                 (h) Distribution Plans for Class A Shares of MFS(R) Equity
                     Income Fund, MFS(R) Research Growth and Income Fund, MFS(R)
                     Core Growth Fund, MFS(R) Aggressive Growth Fund and MFS(R)
                     Special Opportunities Fund each dated January 2, 1996;
                     filed herewith.

                 (i) Distribution Plans for Class B Shares of MFS(R) Equity
                     Income Fund, MFS(R) Research Growth and Income Fund, MFS(R)
                     Core Growth Fund, MFS(R) Aggressive Growth Fund and MFS(R)
                     Special Opportunities Fund each dated January 2, 1996;
                     filed herewith.

                 (j) Distribution Plans for Class C Shares of MFS(R) Equity
                     Income Fund, MFS(R) Research Growth and Income Fund, MFS(R)
                     Core Growth Fund, MFS(R) Aggressive Growth Fund and MFS(R)
                     Special Opportunities Fund each dated January 2, 1996;
                     filed herewith.

                 (k) Form of Distribution Plan for Class C Shares of MFS(R) Cash
                     Reserve Fund; filed herewith.

    
              16 Schedule for Computation of Performance Quotations - Yield
                 Calculation, Average Annual and Aggregate Total Return and
                 Current Distribution Rate. (1)

   
              17 Not Applicable.

    
              18 Not Applicable.



<PAGE>



                  Power of Attorney, dated August 11, 1994. (7)
- ---------------------
(1)  Incorporated by reference to MFS Municipal Series Trust (File Nos. 2-92915
     and 811-4096) Post-Effective Amendment No. 26 filed with the SEC via EDGAR
     on February 22, 1995.
(2)  Incorporated by reference to MFS Municipal Series Trust (File Nos. 2-92915
     and 811-4096) Post-Effective Amendment No. 28 filed with the SEC via EDGAR
     on July 28, 1995.
(3)  Incorporated by reference to Amendment No. 8 on Form
     N-2 for MFS Municipal Income Trust (File No. 811-4841) filed with the SEC
     via EDGAR on February 28, 1995.
(4)  Incorporated by reference to MFS Series
     Trust IX (File Nos. 2-50409 and 811-2464) Post-Effective Amendment No. 32
     filed with the SEC via EDGAR on August 28, 1995.
(5)  Incorporated by
     reference to the Registrant's Post-Effective Amendment No. 20 filed with
     the SEC via EDGAR on March 30, 1995.
(6)  Incorporated by reference to MFS
     Series Trust II (File Nos. 33-7637 and 811-4775) Post-Effective Amendment
     No. 17 filed with the SEC via EDGAR on October 13, 1995.
(7)  Incorporated
     by reference to the Registrant's Post-Effective Amendment No. 21 filed with
     the SEC via EDGAR on October 17, 1995.
(8)  Incorporated by reference to MFS
     Series Trust X (File Nos. 33-1657 and 811-4492) Post-Effective Amendment
     No. 13 filed with the SEC via EDGAR on November 28, 1995.
   
(9) Incorporated  by reference to Registrant's Post-Effective Amendment No. 22
     filed with the SEC via EDGAR on December 29, 1996.

ITEM 25.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT

    
          Not applicable.

   
ITEM 26.  NUMBER OF HOLDERS OF SECURITIES

          FOR MFS MANAGED SECTORS FUND

                 (1)                                         (2)
         TITLE OF CLASS                        NUMBER OF RECORD HOLDERS

    Class A Shares of Beneficial Interest                    21,243
            (without par value)                    (as of February 29, 1996)

    Class B Shares of Beneficial Interest                    15,820
             (without par value)                   (as of February 29, 1996)

    FOR MFS CASH RESERVE FUND

                  (1)                                        (2)
         TITLE OF CLASS                        NUMBER OF RECORD HOLDERS

    Class A Shares of Beneficial Interest                    2,410
            (without par value)                    (as of February 29, 1996)

    Class B Shares of Beneficial Interest                   15,907
            (without par value)                    (as of February 29, 1996)

    Class C Shares of Beneficial Interest                       0
            (without par value)                    (as of February 29, 1996)

    FOR MFS WORLD ASSET ALLOCATION FUND

                     (1)                                     (2)
       TITLE OF CLASS                            NUMBER OF RECORD HOLDERS

    Class A Shares of Beneficial Interest                5,721
            (without par value)                    (as of February 29, 1996)

    Class B Shares of Beneficial Interest                 6,913
            (without par value)                    (as of February 29, 1996)
 
    Class C Shares of Beneficial Interest                  931
            (without par value)                    (as of February 29, 1996)
  
  FOR MFS EQUITY INCOME FUND

                      (1)                                   (2)
             TITLE OF CLASS                      NUMBER OF RECORD HOLDERS

    Class A Shares of Beneficial Interest                    5
             (without par value)                   (as of February 29, 1996)

    Class B Shares of Beneficial Interest                  - 0 -
             (without par value)                   (as of February 29, 1996)

    Class C Shares of Beneficial Interest                  - 0 -
             (without par value)                   (as of February 29, 1996)

    FOR MFS RESEARCH GROWTH AND INCOME FUND

                      (1)                                    (2)
             TITLE OF CLASS                      NUMBER OF RECORD HOLDERS

    Class A Shares of Beneficial Interest                     3
             (without par value)                   (as of February 29, 1996)

    Class B Shares of Beneficial Interest                  - 0 -
             (without par value)                   (as of February 29, 1996)

    Class C Shares of Beneficial Interest                    0 -
             (without par value)                   (as of February 29, 1996)

    FOR MFS CORE GROWTH FUND

                      (1)                                      (2)
             TITLE OF CLASS                      NUMBER OF RECORD HOLDERS

    Class A Shares of Beneficial Interest                    9
             (without par value)                    (as of February 29, 1996)

    Class B Shares of Beneficial Interest                  - 0 -
             (without par value)                    (as of February 29, 1996)

    Class C Shares of Beneficial Interest                  - 0 -
             (without par value)                    (as of February 29, 1996)

    FOR MFS AGGRESSIVE GROWTH FUND

                     (1)                                     (2)
            TITLE OF CLASS                       NUMBER OF RECORD HOLDERS

    Class A Shares of Beneficial Interest                     59
             (without par value)                     (as of February 29, 1996)

    Class B Shares of Beneficial Interest                   - 0 -
             (without par value)                     (as of February 29, 1996)

    Class C Shares of Beneficial Interest                   - 0 -
             (without par value)                     (as of February 29, 1996)

   FOR MFS SPECIAL OPPORTUNITIES FUND

                     (1)                                     (2)
            TITLE OF CLASS                       NUMBER OF RECORD HOLDERS

   Class A Shares of Beneficial Interest                     16
            (without par value)                      (as of February 29, 1996)

   Class B Shares of Beneficial Interest                    - 0 -
            (without par value)                      (as of February 29, 1996)

   Class C Shares of Beneficial Interest                    - 0 -
            (without par value)                      (as of February 29, 1996)

    


<PAGE>



ITEM 27.  INDEMNIFICATION

     Reference is hereby made to (a) Article V of the Trust's Declaration of
Trust, incorporated by reference to the Registrant's Post-Effective Amendment
No. 20 filed with the SEC via EDGAR on March 30, 1995 and (b) Section 8 of the
Shareholder Servicing Agent Agreeement, incorporated by reference to MFS Series
Trust II, Post-Effective Amendment No. 17 filed with the SEC via EDGAR on
October 13, 1995.

     The Trustees and officers of the Registrant and the personnel of the
Registrant's investment adviser and principal underwriter are insured under an
errors and omissions liability insurance policy. The Registrant and its officers
are also insured under the fidelity bond required by Rule 17g-1 under the
Investment Company Act of 1940, as amended.

   
ITEM 28.  BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

     MFS serves as investment adviser to the following open-end Funds comprising
the MFS Family of Funds: Massachusetts Investors Trust, Massachusetts Investors
Growth Stock Fund, MFS Growth Opportunities Fund, MFS Government Securities
Fund, MFS Government Limited Maturity Fund, MFS Series Trust I (which has eight
series: MFS Managed Sectors Fund, MFS Cash Reserve Fund, MFS World Asset
Allocation Fund, MFS Aggressive Growth Fund, MFS Research Growth and Income
Fund, MFS Core Growth Fund, MFS Equity Income Fund and MFS Special Opportunities
Fund), MFS Series Trust II (which has four series: MFS Emerging Growth Fund, MFS
Capital Growth Fund, MFS Intermediate Income Fund and MFS Gold & Natural
Resources Fund), MFS Series Trust III (which has two series: MFS High Income
Fund and MFS Municipal High Income Fund), MFS Series Trust IV (which has four
series: MFS Money Market Fund, MFS Government Money Market Fund, MFS Municipal
Bond Fund and MFS OTC Fund), MFS Series Trust V (which has two series: MFS Total
Return Fund and MFS Research Fund), MFS Series Trust VI (which has three series:
MFS World Total Return Fund, MFS Utilities Fund and MFS World Equity Fund), MFS
Series Trust VII (which has two series: MFS World Governments Fund and MFS Value
Fund), MFS Series Trust VIII (which has two series: MFS Strategic Income Fund
and MFS World Growth Fund), MFS Series Trust IX (which has three series: MFS
Bond Fund, MFS Limited Maturity Fund and MFS Municipal Limited Maturity Fund),
MFS Series Trust X (which has four series: MFS Government Mortgage Fund,
MFS/Foreign & Colonial Emerging Markets Equity Fund, MFS/Foreign & Colonial
International Growth Fund and MFS/Foreign & Colonial International Growth and
Income Fund), and MFS Municipal Series Trust (which has 19 series: MFS Alabama
Municipal Bond Fund, MFS Arkansas Municipal Bond Fund, MFS California Municipal
Bond Fund, MFS Florida Municipal Bond Fund, MFS Georgia Municipal Bond Fund, MFS
Louisiana Municipal Bond Fund, MFS Maryland Municipal Bond Fund, MFS
Massachusetts Municipal Bond Fund, MFS Mississippi Municipal Bond Fund, MFS New
York Municipal Bond Fund, MFS North Carolina Municipal Bond Fund, MFS
Pennsylvania Municipal Bond Fund, MFS South Carolina Municipal Bond Fund, MFS
Tennessee Municipal Bond Fund, MFS Texas Municipal Bond Fund, MFS Virginia
Municipal Bond Fund, MFS Washington Municipal Bond Fund, MFS West Virginia
Municipal Bond Fund and MFS Municipal Income Fund) (the "MFS Funds"). The
principal business address of each of the aforementioned Funds is 500 Boylston
Street, Boston, Massachusetts 02116.

     MFS also serves as investment adviser of the following no-load, open-end
Funds: MFS Institutional Trust ("MFSIT") (which has seven series), MFS Variable
Insurance Trust ("MVI") (which has twelve series) and MFS Union Standard Trust
("UST") (which has two series). The principal business address of each of the
aforementioned Funds is 500 Boylston Street, Boston, Massachusetts 02116.

     In addition, MFS serves as investment adviser to the following closed-end
Funds: MFS Municipal Income Trust, MFS Multimarket Income Trust, MFS Government
Markets Income Trust, MFS Intermediate Income Trust, MFS Charter Income Trust
and MFS Special Value Trust (the "MFS Closed-End Funds"). The principal business
address of each of the aforementioned Funds is 500 Boylston Street, Boston,
Massachusetts 02116.

     Lastly, MFS serves as investment adviser to MFS/Sun Life Series Trust
("MFS/SL"), Sun Growth Variable Annuity Funds, Inc. ("SGVAF"), Money Market
Variable Account, High Yield Variable Account, Capital Appreciation Variable
Account, Government Securities Variable Account, World Governments Variable
Account, Total Return Variable Account and Managed Sectors Variable Account. The
principal business address of each is One Sun Life Executive Park, Wellesley
Hills, Massachusetts 02181.

     MFS International Ltd. ("MIL"), a limited liability company organized under
the laws of the Republic of Ireland and a subsidiary of MFS, whose principal
business address is 41-45 St. Stephen's Green, Dublin 2, Ireland, serves as
investment adviser to and distributor for MFS International Fund (which has four
portfolios: MFS International Funds-U.S. Equity Fund, MFS International
Funds-U.S. Emerging Growth Fund, MFS International Funds-Global Governments Fund
and MFS International Funds-Charter Income Fund) (the "MIL Funds"). The MIL
Funds are organized in Luxembourg and qualify as an undertaking for collective
investments in transferable securities (UCITS). The principal business address
of the MIL Funds is 47, Boulevard Royal, L-2449 Luxembourg.

     MIL also serves as investment adviser to and distributor for MFS Meridian
U.S. Government Bond Fund, MFS Meridian Charter Income Fund, MFS Meridian Global
Government Fund, MFS Meridian U.S. Emerging Growth Fund, MFS Meridian Global
Equity Fund, MFS Meridian Limited Maturity Fund, MFS Meridian World Growth Fund,
MFS Meridian Money Market Fund, MFS Meridian World Total Return Fund, MFS
Meridian U.S. Equity Fund and MFS Meridian Research Fund (collectively the "MFS
Meridian Funds"). Each of the MFS Meridian Funds is organized as an exempt
company under the laws of the Cayman Islands. The principal business address of
each of the MFS Meridian Funds is P.O. Box 309, Grand Cayman, Cayman Islands,
British West Indies.

     MFS International (U.K.) Ltd. ("MIL-UK"), a private limited company
registered with the Registrar of Companies for England and Wales whose current
address is 4 John Carpenter Street, London, England ED4Y 0NH, is involved
primarily in marketing and investment research activities with respect to
private clients and the MIL Funds and the MFS Meridian Funds.

     MFS Fund Distributors, Inc. ("MFD"), a wholly owned subsidiary of MFS,
serves as distributor for the MFS Funds, MVI, UST and MFSIT.

     Clarendon Insurance Agency, Inc. ("CIAI"), a wholly owned subsidiary of
MFS, serves as distributor for certain life insurance and annuity contracts
issued by Sun Life Assurance Company of Canada (U.S.).

     MFS Service Center, Inc. ("MFSC"), a wholly owned subsidiary of MFS, serves
as shareholder servicing agent to the MFS Funds, the MFS Closed-End Funds,
MFSIT, MVI and UST.

     MFS Asset Management, Inc. ("AMI"), a wholly owned subsidiary of MFS,
provides investment advice to substantial private clients.

     MFS Retirement Services, Inc. ("RSI"), a wholly owned subsidiary of MFS,
markets MFS products to retirement plans and provides administrative and record
keeping services for retirement plans.

     MFS

     The Directors of MFS are A. Keith Brodkin, Jeffrey L. Shames, Arnold D.
Scott, John R. Gardner and John D. McNeil. Mr. Brodkin is the Chairman, Mr.
Shames is the President, Mr. Scott is a Senior Executive Vice President and
Secretary, Bruce C. Avery, William S. Harris, William W. Scott, Jr., and
Patricia A. Zlotin are Executive Vice Presidents, Stephen E. Cavan is a Senior
Vice President, General Counsel and an Assistant Secretary, Joseph W. Dello
Russo is a Senior Vice President, Chief Financial Officer and Treasurer, Robert
T. Burns is a Vice President, Associate General Counsel and an Assistant
Secretary of MFS, and Thomas B. Hastings is a Vice President and Assistant
Treasurer.

                  MASSACHUSETTS INVESTORS TRUST
                  MASSACHUSETTS INVESTORS GROWTH STOCK FUND
                  MFS GROWTH OPPORTUNITIES FUND
                  MFS GOVERNMENT SECURITIES FUND
                  MFS SERIES TRUST I
                  MFS SERIES TRUST V
                  MFS SERIES TRUST VI
                  MFS SERIES TRUST X
                  MFS GOVERNMENT LIMITED MATURITY FUND

     A. Keith Brodkin is the Chairman and President, Stephen E. Cavan is the
Secretary, W. Thomas London is the Treasurer, James O. Yost, Vice President of
MFS, is the Assistant Treasurer, James R. Bordewick, Jr., Vice President and
Associate General Counsel of MFS, is the Assistant Secretary.

     MFS SERIES TRUST II

     A. Keith Brodkin is the Chairman and President, Leslie J. Nanberg, Senior
Vice President of MFS, is a Vice President, Stephen E. Cavan is the Secretary,
W. Thomas London is the Treasurer, James O. Yost is the Assistant Treasurer, and
James R. Bordewick, Jr., is the Assistant Secretary.

     MFS GOVERNMENT MARKETS INCOME TRUST
     MFS INTERMEDIATE INCOME TRUST

     A. Keith Brodkin is the Chairman and President, Patricia A. Zlotin,
Executive Vice President of MFS and Leslie J. Nanberg, Senior Vice President of
MFS, are Vice Presidents, Stephen E. Cavan is the Secretary, W. Thomas London is
the Treasurer, James O. Yost is the Assistant Treasurer, and James R. Bordewick,
Jr., is the Assistant Secretary.

     MFS SERIES TRUST III

     A. Keith Brodkin is the Chairman and President, James T. Swanson, Robert J.
Manning, Cynthia M. Brown and Joan S. Batchelder, Senior Vice Presidents of MFS,
Bernard Scozzafava, Vice President of MFS, and Matthew Fontaine, Assistant Vice
President of MFS, are Vice Presidents, Sheila Burns-Magnan and Daniel E.
McManus, Assistant Vice Presidents of MFS, are Assistant Vice Presidents,
Stephen E. Cavan is the Secretary, W. Thomas London is the Treasurer, James O.
Yost is the Assistant Treasurer, and James R. Bordewick, Jr., is the Assistant
Secretary.

     MFS SERIES TRUST IV
     MFS SERIES TRUST IX

     A. Keith Brodkin is the Chairman and President, Robert A. Dennis and
Geoffrey L. Kurinsky, Senior Vice Presidents of MFS, are Vice Presidents,
Stephen E. Cavan is the Secretary, W. Thomas London is the Treasurer, James O.
Yost is the Assistant Treasurer and James R. Bordewick, Jr., is the Assistant
Secretary.

     MFS SERIES TRUST VII

     A. Keith Brodkin is the Chairman and President, Leslie J. Nanberg and
Stephen C. Bryant, Senior Vice Presidents of MFS, are Vice Presidents, Stephen
E. Cavan is the Secretary, W. Thomas London is the Treasurer, James O. Yost is
the Assistant Treasurer and James R. Bordewick, Jr., is the Assistant Secretary.

     MFS SERIES TRUST VIII

     A. Keith Brodkin is the Chairman and President, Jeffrey L. Shames, Leslie
J. Nanberg, Patricia A. Zlotin, James T. Swanson and John D. Laupheimer, Jr.,
Vice President of MFS, are Vice Presidents, Stephen E. Cavan is the Secretary,
W. Thomas London is the Treasurer, James O. Yost is the Assistant Treasurer and
James R. Bordewick, Jr., is the Assistant Secretary.

     MFS MUNICIPAL SERIES TRUST

     A. Keith Brodkin is the Chairman and President, Cynthia M. Brown and Robert
A. Dennis are Vice Presidents, David B. Smith, Geoffrey L. Schechter and David
R. King, Vice Presidents of MFS, are Vice Presidents, Daniel E. McManus,
Assistant Vice President of MFS, is an Assistant Vice President, Stephen E.
Cavan is the Secretary, W. Thomas London is the Treasurer, James O. Yost is the
Assistant Treasurer and James R. Bordewick, Jr., is the Assistant Secretary.

     MFS VARIABLE INSURANCE TRUST
     MFS UNION STANDARD TRUST
     MFS INSTITUTIONAL TRUST

     A. Keith Brodkin is the Chairman and President, Stephen E. Cavan is the
Secretary, W. Thomas London is the Treasurer, James O. Yost is the Assistant
Treasurer and James R. Bordewick, Jr., is the Assistant Secretary.

     MFS MUNICIPAL INCOME TRUST

     A. Keith Brodkin is the Chairman and President, Cynthia M. Brown and Robert
J. Manning are Vice Presidents, Stephen E. Cavan is the Secretary, W. Thomas
London is the Treasurer, James O. Yost, is the Assistant Treasurer and James R.
Bordewick, Jr., is the Assistant Secretary.

     MFS MULTIMARKET INCOME TRUST
     MFS CHARTER INCOME TRUST

     A. Keith Brodkin is the Chairman and President, Patricia A. Zlotin, Leslie
J. Nanberg and James T. Swanson are Vice Presidents, Stephen E. Cavan is the
Secretary, W. Thomas London is the Treasurer, James O. Yost, Vice President of
MFS, is the Assistant Treasurer and James R. Bordewick, Jr., is the Assistant
Secretary.

     MFS SPECIAL VALUE TRUST

     A. Keith Brodkin is the Chairman and President, Jeffrey L. Shames, Patricia
A. Zlotin and Robert J. Manning are Vice Presidents, Stephen E. Cavan is the
Secretary, W. Thomas London is the Treasurer, and James O. Yost, is the
Assistant Treasurer and James R. Bordewick, Jr., is the Assistant Secretary.

     SGVAF

     W. Thomas London is the Treasurer.

     MIL

     A. Keith Brodkin is a Director and the Chairman, Arnold D. Scott and
Jeffrey L. Shames are Directors, Ziad Malek, Senior Vice President of MFS, is
the President, Thomas J. Cashman, Jr., a Senior Vice President of MFS, is a
Senior Vice President, Stephen E. Cavan is a Director, Senior Vice President and
the Clerk, James R. Bordewick, Jr. is a Director, Vice President and an
Assistant Clerk, Robert T. Burns is an Assistant Clerk, Joseph W. Dello Russo is
the Treasurer and Thomas B. Hastings is the Assistant Treasurer.

     MIL-UK

     A. Keith Brodkin is a Director and the Chairman, Arnold D. Scott, Jeffrey
L. Shames, and James R. Bordewick, Jr., are Directors, Stephen E. Cavan is a
Director and the Secretary, Ziad Malek is the President, James E. Russell is the
Treasurer, and Robert T. Burns is the Assistant Secretary.

     MIL FUNDS

     A. Keith Brodkin is the Chairman, President and a Director, Richard B.
Bailey, John A. Brindle and Richard W. S. Baker are Directors, Stephen E. Cavan
is the Secretary, W. Thomas London is the Treasurer, James O. Yost is the
Assistant Treasurer and James R. Bordewick, Jr., is the Assistant Secretary, and
Ziad Malek is a Senior Vice President.

     MFS MERIDIAN FUNDS

     A. Keith Brodkin is the Chairman, President and a Director, Richard B.
Bailey, John A. Brindle, Richard W. S. Baker, Arnold D. Scott and Jeffrey L.
Shames are Directors, Stephen E. Cavan is the Secretary, W. Thomas London is the
Treasurer, James R. Bordewick, Jr., is the Assistant Secretary, James O. Yost is
the Assistant Treasurer, and Ziad Malek is a Senior Vice President.

     MFD

     A. Keith Brodkin is the Chairman and a Director, Arnold D. Scott and
Jeffrey L. Shames are Directors, William W. Scott, Jr., an Executive Vice
President of MFS, is the President, Stephen E. Cavan is the Secretary, Robert T.
Burns is the Assistant Secretary, Joseph W. Dello Russo is the Treasurer, and
Thomas B. Hastings is the Assistant Treasurer.

     CIAI

     A. Keith Brodkin is the Chairman and a Director, Arnold D. Scott and
Jeffrey L. Shames are Directors, Cynthia Orcott is President, Bruce C. Avery is
the Vice President, Joseph W. Dello Russo is the Treasurer, Thomas B. Hastings
is the Assistant Treasurer, Stephen E. Cavan is the Secretary, and Robert T.
Burns is the Assistant Secretary.

     MFSC

     A. Keith Brodkin is the Chairman and a Director, Arnold D. Scott and
Jeffrey L. Shames are Directors, Joseph A. Recomendes, a Senior Vice President
of MFS, is Vice Chairman and a Director, Janet A. Clifford is the Executive Vice
President, Joseph W. Dello Russo is the Treasurer, Thomas B. Hastings is the
Assistant Treasurer, Stephen E. Cavan is the Secretary, and Robert T. Burns is
the Assistant Secretary.

     AMI

     A. Keith Brodkin is the Chairman and a Director, Jeffrey L. Shames, and
Arnold D. Scott are Directors, Thomas J. Cashman, Jr., is the President and a
Director, Leslie J. Nanberg is a Senior Vice President, a Managing Director and
a Director, George F. Bennett, Carol A. Corley, John A. Gee, Brianne Grady and
Kevin R. Parke are Senior Vice Presidents and Managing Directors, Joseph W.
Dello Russo is the Treasurer, Thomas B. Hastings is the Assistant Treasurer and
Robert T. Burns is the Secretary.

     RSI

     William W. Scott, Jr., Joseph A. Recomendes and Bruce C. Avery are
Directors, Arnold D. Scott is the Chairman and a Director, Douglas C. Grip, a
Senior Vice President of MFS, is the President, Joseph W. Dello Russo is the
Treasurer, Thomas B. Hastings is the Assistant Treasurer, Stephen E. Cavan is
the Secretary, Robert T. Burns is the Assistant Secretary and Sharon A. Brovelli
is a Senior Vice President.

     In addition, the following persons, Directors or officers of MFS, have the
affiliations indicated:

    A. Keith Brodkin       Director, Sun Life Assurance Company of Canada
                             (U.S.), One Sun Life Executive Park, Wellesley
                             Hills, Massachusetts
                           Director, Sun Life Insurance and Annuity Company of
                             New York, 67 Broad Street, New York, New York

   John A. Gardner         President and a Director, Sun Life Assurance Company
                             of Canada, Sun Life Centre, 150 King Street West,
                             Toronto, Ontario, Canada (Mr. Gardner is also an
                             officer and/or Director of various subsidiaries and
                             affiliates of Sun Life)

   John D. McNeil         Chairman, Sun Life Assurance Company of Canada,
                             Sun Life Centre, 150 King Street West, Toronto,
                             Ontario, Canada (Mr. McNeil is also an officer
                             and/or Director of various subsidiaries and
                             affiliates of Sun Life)

   Joseph W. Dello Russo   Director of Mutual Fund Operations, The Boston
                             Company, Exchange Place, Boston, Massachusetts
                             (until August, 1994)

    
ITEM 29.  DISTRIBUTORS

          (a)  Reference is hereby made to Item 28 above.

          (b) Reference is hereby made to Item 28 above; the principal business
address of each of these persons is 500 Boylston Street, Boston, Massachusetts
02116.

          (c) Not applicable.

ITEM 30.  LOCATION OF ACCOUNTS AND RECORDS

          The accounts and records of the Registrant are located, in whole or in
part, at the office of the Registrant and the following locations:

                  NAME                                      ADDRESS
                  ----                                      -------
       assachusetts Financial Services                500 Boylston Street
         Company (investment adviser)                 Boston, MA  02116

      MFS Fund Distributors, Inc.                     500 Boylston Street
         (distributor)                                Boston, MA  02116

      State Street Bank and Trust Company             State Street South
         (custodian)                                  5-West
                                                      North Quincy, MA  02171

      Investors Bank & Trust Company                  89 South Street
         (custodian)                                  Boston, MA  02111

      MFS Service Center, Inc.                        500 Boylston Street
         (transfer agent)                             Boston, MA  02116

ITEM 31.  MANAGEMENT SERVICES

          Not applicable.



<PAGE>



ITEM 32.  UNDERTAKINGS

          (a)    Not applicable.

          (b)    Not applicable.
          
          (c) The registrant undertakes to furnish each person to whom a
prospectus is delivered a copy of the Registrant's latest annual report to
Shareholders upon request and without a charge.

          (d) Insofar as indemnification for liability arising under the
Securities Act of 1933 may be permitted to trustees, officers and controlling
persons of the Registrant pursuant to the provisions set forth in Item 27 of
this Part C, or otherwise, the Registrant has been advised that in the opinion
of the Securities and Exchange Commission such indemnification is against public
policy as expressed in the Act and is, therefore, unenforceable. In the event
that a claim for indemnification against such liabilities (other than the
payment by the Registrant of expenses incurred or paid by a trustee, officer or
controlling person of the Registrant in the successful defense of any action,
suit or proceeding) is asserted by such director, officer or controlling person
in connection with the Securities being Registered, the Registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.


<PAGE>

                               SIGNATURES


          Pursuant to the requirements of the Securities Act of 1933 and the
Investment Company Act of 1940, the Registrant certifies that it meets all of
the requirements for effectiveness of this Registration Statement pursuant to
Rule 485(b) under the Securities Act of 1933 and has duly caused this
Post-Effective Amendment to the Registration Statement to be signed on its
behalf by the undersigned, thereto duly authorized, in the City of Boston and
The Commonwealth of Massachusetts on the 25th day of March, 1996.

                                               MFS SERIES TRUST I


                                               By:     JAMES R. BORDEWICK, JR.
                                               Name:   James R. Bordewick, Jr.
                                               Title:  Assistant Secretary

     Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment to its Registration Statement has been signed below by
the following persons in the capacities indicated on March 25, 1996.

             SIGNATURE                            TITLE
             ---------                            -----
A. KEITH BRODKIN*                                Chairman, President (Principal
- ----------------                                  Executive Officer) and Trustee
A. Keith Brodkin                                  


W. THOMAS LONDON*                                Treasurer (Principal Financial
- ----------------                                  Officer and Principal
W. Thomas London                                  Accounting Officer)

RICHARD B. BAILEY*                               Trustee
- -----------------
Richard B. Bailey


MARSHALL N. COHAN*                               Trustee
- -----------------
Marshall N. Cohan


LAWRENCE H. COHN, M.D.*                          Trustee
- -----------------------
Lawrence H. Cohn, M.D.


SIR J. DAVID GIBBONS*                            Trustee
- ---------------------
Sir J. David Gibbons

ABBY M. O'NEILL*                                 Trustee
- ----------------
Abby M. O'Neill


WALTER E. ROBB, III*                             Trustee
- --------------------
Walter E. Robb, III


ARNOLD D. SCOTT*                                 Trustee
- ---------------
Arnold D. Scott


JEFFREY L. SHAMES*                               Trustee
- ------------------
Jeffrey L. Shames


J. DALE SHERRATT*                                Trustee
- -----------------
J. Dale Sherratt


WARD SMITH*                                      Trustee
- -----------
Ward Smith


                                                *By: JAMES R. BORDEWICK, JR.
                                                Name: James R. Bordewick, Jr.
                                                  as Attorney-in-fact
                                                Executed by James R. Bordewick,
                                                Jr. on behalf of those indicated
                                                pursuant to a Power of Attorney
                                                dated August 11, 1994,
                                                incorporated by reference to
                                                Registrant's Post-Effective
                                                Amendment No. 21 filed with the
                                                SEC via EDGAR on October 17,
                                                1995.





<PAGE>

<TABLE>
                                INDEX TO EXHIBITS


<CAPTION>
EXHIBIT NO.                                DESCRIPTION OF EXHIBIT                                  PAGE NO.
- -----------                                ----------------------                                  --------
<S>                          <C>                                                                   <C>

   
     1    (c)                 Amendment to Declaration of Trust, dated February 21, 1996.

     5    (d)                 Investment Advisory Agreement for MFS(R)Equity Income Fund,
                               dated January 2, 1996.

          (e)                 Investment Advisory Agreement for MFS(R) Research Growth and
                               Income Fund, dated January 2, 1996.

          (f)                 Investment Advisory Agreement for MFS(R) Core Growth Fund, dated
                               January 2, 1996.

          (g)                 Investment Advisory Agreement for MFS(R) Aggressive Growth Fund,
                               dated January 2, 1996.

          (h)                 Investment Advisory Agreement for MFS(R) Special Opportunities
                               Fund, dated January 2, 1996.

    15    (h)                 Distribution Plans for Class A Shares of MFS(R)Equity Income
                               Fund, MFS(R)Research Growth and Income Fund, MFS(R)Core Growth
                               Fund, MFS(R)Aggressive Growth Fund and MFS(R)Special
                               Opportunities Fund each dated January 2, 1996.

          (i)                 Distribution Plans for Class B Shares of MFS(R)
                               Equity Income Fund, MFS(R) Research Growth and
                               Income Fund, MFS(R) Core Growth Fund, MFS(R)
                               Aggressive Growth Fund and MFS(R) Special
                               Opportunities Fund each dated January 2, 1996.

          (j)                 Distribution Plans for Class C Shares of MFS(R)
                               Equity Income Fund, MFS(R) Research Growth and
                               Income Fund, MFS(R) Core Growth Fund, MFS(R)
                               Aggressive Growth Fund and MFS(R) Special
                               Opportunities Fund each dated January 2, 1996.

          (k)                 Form of Distribution Plan for Class C Shares of MFS(R) Cash
                               Reserve Fund.
    
</TABLE>


                                                             EXHIBIT NO. 99.1(c)

                               MFS SERIES TRUST I

                           CERTIFICATION OF AMENDMENT

                           TO THE DECLARATION OF TRUST

                          ESTABLISHMENT AND DESIGNATION

                                   OF CLASSES

         The undersigned, being a majority of the Trustees of MFS Series Trust I
(the "Trust"), a business trust organized under the laws of The Commonwealth of
Massachusetts pursuant to an Amended and Restated Declaration of Trust dated
December 14, 1994, as amended (the "Declaration"), acting pursuant to Section
6.10 of the Declaration, do hereby divide the shares of MFS Cash Reserve Fund, a
series of MFS Series Trust I, to create an additional class of shares, within
the meaning of Section 6.10, as follows:

          1.       The additional class of shares is designated "Class C.
                   Shares";

          2.       Class C Shares shall be entitled to all the rights and
                   preferences accorded to shares under the Declaration;

          3.       The purchase price of Class C Shares, the method of
                   determination of the net asset value Class C Shares, the
                   price, terms and manner of redemption of Class C Shares, and
                   the relative dividend rights of holders of Class C Shares
                   shall be established by the Trustees of the Trust in
                   accordance with the Declaration and shall be set forth in the
                   current prospectus and statement of additional information of
                   the Trust or any series thereof, as amended from time to
                   time, contained in the Trust's registration statement under
                   the Securities Act of 1933, as amended;

          4.       Class C Shares shall vote together as a single class except
                   that Shares of a class may vote separately on matters
                   affecting only that class and Shares of a class not affected
                   by a matter will not vote on that matter; and

          5.       A class of Shares of any series of the Trust may be
                   terminated by the Trustees by written notice to the 
                   Shareholders of the class.


<PAGE>



      IN WITNESS WHEREOF, a majority of the Trustees of the Trust have executed
this amendment, in one or more counterparts, all constituting a single
instrument, as an instrument under seal in The Commonwealth of Massachusetts, as
of this 14th day of February, 1996.

A. KEITH BRODKIN                               WALTER E. ROBB, III
- ------------------------------------           ---------------------------------
A. Keith Brodkin                               Walter E. Robb, III
76 Farm Road                                   35 Farm Road
Sherborn, MA  01770                            Sherborn,  MA  01770


RICHARD B. BAILEY                              ARNOLD D. SCOTT
- ------------------------------------           ---------------------------------
Richard B. Bailey                              Arnold D. Scott
63 Atlantic Avenue                             20 Rowes Wharf
Boston,  MA  02110                             Boston, MA  02110


MARSHALL N. COHAN                              JEFFREY L. SHAMES
- ------------------------------------           --------------------------------
Marshall N. Cohan                              Jeffrey L. Shames
2524 Bedford Mews Drive                        60 Brookside Road
Wellington,  FL  33414                         Needham, MA  02192


LAWRENCE H. COHN                               J. DALE SHERRATT
- ------------------------------------           ---------------------------------
Lawrence H. Cohn                               J. Dale Sherratt
45 Singletree Road                             86 Farm Road
Chestnut Hill,  MA  02167                      Sherborn, MA  01770


SIR J. DAVID GIBBONS                           WARD SMITH
- ------------------------------------           ---------------------------------
Sir J. David Gibbons                           Ward Smith
"Leeward"                                      36080 Shaker Blvd
5 Leeside Drive                                Huntington Valley, OH 44022
"Point Shares"
Pembroke,  Bermuda  HM  05


ABBY M. O'NEILL
- ------------------------------------
Abby M. O'Neill
200 Sunset Road
Oyster Bay,  NY  11771


                                                             EXHIBIT NO. 99.5(d)

                          INVESTMENT ADVISORY AGREEMENT

         INVESTMENT ADVISORY AGREEMENT, dated this 2nd day of January, 1996, by
and between MFS SERIES TRUST I, a Massachusetts business trust (the "Trust"), on
behalf of MFS EQUITY INCOME 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, 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 6, 1995, 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 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 0.75% of the
Fund's average daily net assets for its then-current fiscal year. If the Adviser
shall serve for less than the whole of any period specified in this 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-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 January 2, 1998 on which date it will terminate unless its
continuance after January 2, 1998 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.

         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.


<PAGE>



         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed and delivered in their names and on their behalf by the undersigned,
thereunto duly authorized, and their respective seals to be hereto affixed, all
as of the day and year first written above. The undersigned Trustee of the Trust
has executed this Agreement not individually, but as Trustee under the
Declaration.

                                                  MFS SERIES TRUST I on
                                                    behalf of MFS EQUITY INCOME
                                                    FUND, one of its series

                                                  By: A. KEITH BRODKIN
                                                      ----------------
                                                      A. Keith Brodkin
                                                      Chairman and Trustee

                                                  MASSACHUSETTS FINANCIAL
                                                    SERVICES COMPANY

                                                  By: A. KEITH BRODKIN
                                                      ----------------
                                                      A. Keith Brodkin
                                                      Chairman


                                                             EXHIBIT NO. 99.5(e)

                         INVESTMENT ADVISORY AGREEMENT

         INVESTMENT ADVISORY AGREEMENT, dated this 2nd day of January, 1996, by
and between MFS SERIES TRUST I, a Massachusetts business trust (the "Trust"), on
behalf of MFS RESEARCH GROWTH AND INCOME 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, 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 6, 1995, 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 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 0.75% of the
Fund's average daily net assets for its then-current fiscal year. If the Adviser
shall serve for less than the whole of any period specified in this 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-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 January 2, 1998 on which date it will terminate unless its
continuance after January 2, 1998 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.

         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.


<PAGE>


         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed and delivered in their names and on their behalf by the undersigned,
thereunto duly authorized, and their respective seals to be hereto affixed, all
as of the day and year first written above. The undersigned Trustee of the Trust
has executed this Agreement not individually, but as Trustee under the
Declaration.

                                        MFS SERIES TRUST I on
                                          behalf of MFS RESEARCH
                                          GROWTH AND INCOME FUND,
                                          one of its series
                                    
                                        By: A. KEITH BRODKIN
                                            ----------------
                                            A. Keith Brodkin
                                            Chairman and Trustee
                                    
                                        MASSACHUSETTS FINANCIAL
                                          SERVICES COMPANY
                                    
                                        By: A. KEITH BRODKIN
                                            ----------------
                                            A. Keith Brodkin
                                            Chairman
                              

                                                             EXHIBIT NO. 99.5(f)

                          INVESTMENT ADVISORY AGREEMENT

         INVESTMENT ADVISORY AGREEMENT, dated this 2nd day of January, 1996, by
and between MFS SERIES TRUST I, a Massachusetts business trust (the "Trust"), on
behalf of MFS CORE GROWTH 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, 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 6, 1995, 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 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 0.75% of the
Fund's average daily net assets for its then-current fiscal year. If the Adviser
shall serve for less than the whole of any period specified in this 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-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 January 2, 1998 on which date it will terminate unless its
continuance after January 2, 1998 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.

         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.


<PAGE>



         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed and delivered in their names and on their behalf by the undersigned,
thereunto duly authorized, and their respective seals to be hereto affixed, all
as of the day and year first written above. The undersigned Trustee of the Trust
has executed this Agreement not individually, but as Trustee under the
Declaration.

                                             MFS SERIES TRUST I on
                                               behalf of MFS CORE GROWTH
                                               FUND, one of its series

                                             By: A. KEITH BRODKIN
                                                 ----------------
                                                 A. Keith Brodkin
                                                 Chairman and Trustee

                                             MASSACHUSETTS FINANCIAL
                                               SERVICES COMPANY

                                             By: A. KEITH BRODKIN
                                                 ----------------
                                                 A. Keith Brodkin
                                                 Chairman


                                                             EXHIBIT NO. 99.5(g)

                          INVESTMENT ADVISORY AGREEMENT

         INVESTMENT ADVISORY AGREEMENT, dated this 2nd day of January, 1996, by
and between MFS SERIES TRUST I, a Massachusetts business trust (the "Trust"), on
behalf of MFS AGGRESSIVE GROWTH 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, 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 6, 1995, 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 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 0.75% of the
Fund's average daily net assets for its then-current fiscal year. If the Adviser
shall serve for less than the whole of any period specified in this 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-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 January 2, 1998 on which date it will terminate unless its
continuance after January 2, 1998 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.

         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.


<PAGE>



         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed and delivered in their names and on their behalf by the undersigned,
thereunto duly authorized, and their respective seals to be hereto affixed, all
as of the day and year first written above. The undersigned Trustee of the Trust
has executed this Agreement not individually, but as Trustee under the
Declaration.

                                           MFS SERIES TRUST I on
                                             behalf of MFS AGGRESSIVE
                                             GROWTH FUND, one of its series

                                           By: A. KEITH BRODKIN
                                               ----------------
                                               A. Keith Brodkin
                                               Chairman and Trustee

                                           MASSACHUSETTS FINANCIAL
                                             SERVICES COMPANY
                       
                                           By: A. KEITH BRODKIN
                                               ----------------
                                               A. Keith Brodkin
                                               Chairman


                                                             EXHIBIT NO. 99.5(h)

                          INVESTMENT ADVISORY AGREEMENT

         INVESTMENT ADVISORY AGREEMENT, dated this 2nd day of January, 1996, by
and between MFS SERIES TRUST I, a Massachusetts business trust (the "Trust"), on
behalf of MFS SPECIAL OPPORTUNITIES 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, 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 6, 1995, 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 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 0.75% of the
Fund's average daily net assets for its then-current fiscal year. If the Adviser
shall serve for less than the whole of any period specified in this 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-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 January 2, 1998 on which date it will terminate unless its
continuance after January 2, 1998 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.

         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.


<PAGE>



         IN WITNESS WHEREOF, the parties have caused this Agreement to be
executed and delivered in their names and on their behalf by the undersigned,
thereunto duly authorized, and their respective seals to be hereto affixed, all
as of the day and year first written above. The undersigned Trustee of the Trust
has executed this Agreement not individually, but as Trustee under the
Declaration.

                                      MFS SERIES TRUST I on
                                        behalf of MFS SPECIAL
                                        SPECIAL OPPORTUNITIES
                                        FUND, one of its series

                                      By: A. KEITH BRODKIN
                                          ----------------
                                          A. Keith Brodkin
                                          Chairman and Trustee

                                      MASSACHUSETTS FINANCIAL
                                        SERVICES COMPANY

                                      By: A. KEITH BRODKIN
                                          ----------------
                                          A. Keith Brodkin
                                          Chairman


                                                             XHIBIT NO. 99.15(h)

                               MFS SERIES TRUST I

                             MFS EQUITY INCOME FUND

                                DISTRIBUTION PLAN

DISTRIBUTION PLAN with respect to the shares of beneficial interest to be
designated "CLASS A" of the MFS EQUITY INCOME FUND (the "Fund"), a series of MFS
Series Trust I (the "Trust"), a business trust organized and existing under the
laws of The Commonwealth of Massachusetts, dated this 2nd day of January, 1996.

                                   WITNESSETH:

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

WHEREAS, the Trust intends to distribute the Shares of Beneficial Interest
(without par value) of the Fund designated Class A Shares (the "Shares") in part
in accordance with Rule 12b-1 under the Act, ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") in a form approved by the Board of Trustees of the Trust (the "Board
of Trustees") in the manner specified in Rule 12b-1, with MFS Fund Distributors,
Inc., a Delaware corporation, as distributor (the "Distributor"), whereby the
Distributor provides facilities and personnel and renders services to the Fund
in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that the Distributor will enter into
agreements ("Dealer Agreements") with various securities dealers and other
financial intermediaries ("Dealers") pursuant to which the Dealers will act as
dealers of the Shares in connection with the offering of Shares; and

WHEREAS, the Distribution Agreement provides that a sales charge may be paid by
investors who purchase Shares and that the Distributor and Dealers will receive
such sales charge as partial compensation for their services in connection with
sale of Shares; and

WHEREAS, the Board of Trustees, in considering whether the Fund should adopt and
implement this Plan, has evaluated such information as it deemed necessary to an
informed determination as to whether this Plan should be adopted and implemented
and has considered such pertinent factors as it deemed necessary to form the
basis for a decision to use assets of the Fund for such purposes, and has
determined that there is a reasonable likelihood that the adoption and
implementation of this Plan will benefit the Fund and its Class A shareholders;

NOW, THEREFORE, the Board of Trustees hereby adopts this Plan for the Fund as a
plan of distribution relating to the Shares in accordance with Rule 12b-1 under
the Act, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
ongoing maintenance commissions to Dealers (excluding service fees described in
paragraph 4), all expenses of printing (excluding typesetting) and distributing
prospectuses to prospective shareholders and providing such other related
services as are reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses
described in Section 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. As partial consideration for the services performed as specified in
the Distribution Agreement and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.25% per annum of the
average daily net assets of the Fund attributable to the Shares. Such payments
shall commence following shareholder approval of the Plan but only upon
notification by the Distributor to the Fund of the commencement of the Plan (the
"Commencement Date"). All or a portion of the distribution fee paid by the Fund
to the Distributor may be paid by the Distributor to Dealers in consideration of
the Dealer's services as a dealer of the Shares. The Distributor may from time
to time establish minimum amount requirements and additional or different dealer
qualification standards or other criteria to be met by dealers for payment of
any fee under this paragraph 3. It is understood that the Distributor may, but
is not required to, pay reduced fees or no fees under this paragraph 3 to
Dealers with respect to assets represented by Shares that have converted from
shares of beneficial interest of the Fund designated "Class B."

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its Dealer Agreement, the Fund shall on or after the
Commencement Date pay each Dealer a service fee periodically at a rate not to
exceed 0.25% per annum of the portion of the average daily net assets of the
Fund that is represented by Shares that are owned by investors for whom such
Dealer is the holder or dealer of record. The Distributor may from time to time
reduce the amount of the service fee paid to a Dealer with respect to Shares
sold prior to a certain date.

         5. In addition to fees payable pursuant to Sections 3 and 4 hereof, the
expenses permitted to be paid by the Fund pursuant to this Plan on or after the
Commencement Date shall include other distribution related expenses. These other
distribution related expenses may include, but are not limited to, a dealer
commission and a payment to wholesalers employed by the Distributor on net asset
value purchases at or above a certain dollar level.

         The aggregate amount of fees and expenses paid pursuant to Sections 3
and 4 hereof and this Section 5 shall not exceed 0.50% per annum of the average
daily net assets of the Fund attributable to the Shares. No fees shall be paid
pursuant to Section 4 hereof or this Section 5 to any insurance company which
has entered into an agreement with the Trust on behalf of the Fund and the
Distributor that permits such insurance company to purchase Shares from the Fund
at their net asset value in connection with annuity agreements issued in
connection with the insurance company's separate accounts. That portion of the
Fund's average daily net assets on which fees payable under Section 4 hereof and
this Section 5 are calculated may be subject to certain minimum amount
requirements as may be determined, and additional or different dealer or
wholesaler qualification standards that may be established, from time to time by
the Distributor. The Distributor shall be entitled to be paid any fees payable
under Section 4 hereof or this Section 5 with respect to accounts for which no
Dealer of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The fees and expenses payable pursuant to
Section 4 and this Section 5 may from time to time be paid by the Fund to the
Distributor and the Distributor will then pay these expenses on behalf of the
Fund.

         6. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         7. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of the Shares, and (b)
approval by a vote of the Board of Trustees and vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any of the
agreements related to the Plan (the "Qualified Trustees"), such votes to be cast
in person at a meeting called for the purpose of voting on this Plan.

         8. This Plan shall continue in effect indefinitely; provided, however,
that such continuance is subject to annual approval by a vote of the Board of
Trustees and a majority of the Qualified Trustees, such votes to be cast in
person at a meeting called for the purpose of voting on continuance of this
Plan.

         9. This Plan may be amended at any time by the Board of Trustees;
provided that (a) any amendment to increase materially the amount to be spent
for the services described herein shall be effective only upon approval by a
vote of a "majority of the outstanding voting securities" of the Shares and (b)
any material amendment of this Plan shall be effective only upon approval by a
vote of the Board of Trustees and a majority of the Qualified Trustees, such
votes to be cast in person at a meeting called for the purpose of voting on such
amendment. This Plan may be terminated at any time by vote of a majority of the
Qualified Trustees or by a vote of a "majority of the outstanding voting
securities" of the Shares.

         10. The Distributor shall provide the Board of Trustees, and the Board
of Trustees shall review, at least quarterly, a written report of the amounts
expended under the Plan and the purposes for which such expenditures were made.

         11. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         12. For the purposes of this Plan, the terms "interested person" and
"majority of the outstanding voting securities" are used as defined in the Act.
In addition, for purposes of determining the fees payable to Dealers and
wholesalers, the value of the Share's net assets shall be computed in the manner
specified in the Fund's then current prospectus for computation of the net asset
value of the Shares.

         13. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in Section 10 hereof (collectively
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such Record shall be kept in an easily
accessible place for the first two years of said record keeping.

         14. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         15. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                       MFS RESEARCH GROWTH AND INCOME FUND

                                DISTRIBUTION PLAN

DISTRIBUTION PLAN with respect to the shares of beneficial interest to be
designated "CLASS A" of the MFS RESEARCH GROWTH AND INCOME FUND (the "Fund"), a
series of MFS Series Trust I (the "Trust"), a business trust organized and
existing under the laws of The Commonwealth of Massachusetts, dated this 2nd day
of January, 1996.

                                   WITNESSETH:

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

WHEREAS, the Trust intends to distribute the Shares of Beneficial Interest
(without par value) of the Fund designated Class A Shares (the "Shares") in part
in accordance with Rule 12b-1 under the Act, ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") in a form approved by the Board of Trustees of the Trust (the "Board
of Trustees") in the manner specified in Rule 12b-1, with MFS Fund Distributors,
Inc., a Delaware corporation, as distributor (the "Distributor"), whereby the
Distributor provides facilities and personnel and renders services to the Fund
in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that the Distributor will enter into
agreements ("Dealer Agreements") with various securities dealers and other
financial intermediaries ("Dealers") pursuant to which the Dealers will act as
dealers of the Shares in connection with the offering of Shares; and

WHEREAS, the Distribution Agreement provides that a sales charge may be paid by
investors who purchase Shares and that the Distributor and Dealers will receive
such sales charge as partial compensation for their services in connection with
sale of Shares; and

WHEREAS, the Board of Trustees, in considering whether the Fund should adopt and
implement this Plan, has evaluated such information as it deemed necessary to an
informed determination as to whether this Plan should be adopted and implemented
and has considered such pertinent factors as it deemed necessary to form the
basis for a decision to use assets of the Fund for such purposes, and has
determined that there is a reasonable likelihood that the adoption and
implementation of this Plan will benefit the Fund and its Class A shareholders;

NOW, THEREFORE, the Board of Trustees hereby adopts this Plan for the Fund as a
plan of distribution relating to the Shares in accordance with Rule 12b-1 under
the Act, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
ongoing maintenance commissions to Dealers (excluding service fees described in
paragraph 4), all expenses of printing (excluding typesetting) and distributing
prospectuses to prospective shareholders and providing such other related
services as are reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses
described in Section 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. As partial consideration for the services performed as specified in
the Distribution Agreement and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.25% per annum of the
average daily net assets of the Fund attributable to the Shares. Such payments
shall commence following shareholder approval of the Plan but only upon
notification by the Distributor to the Fund of the commencement of the Plan (the
"Commencement Date"). All or a portion of the distribution fee paid by the Fund
to the Distributor may be paid by the Distributor to Dealers in consideration of
the Dealer's services as a dealer of the Shares. The Distributor may from time
to time establish minimum amount requirements and additional or different dealer
qualification standards or other criteria to be met by dealers for payment of
any fee under this paragraph 3. It is understood that the Distributor may, but
is not required to, pay reduced fees or no fees under this paragraph 3 to
Dealers with respect to assets represented by Shares that have converted from
shares of beneficial interest of the Fund designated "Class B."

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its Dealer Agreement, the Fund shall on or after the
Commencement Date pay each Dealer a service fee periodically at a rate not to
exceed 0.25% per annum of the portion of the average daily net assets of the
Fund that is represented by Shares that are owned by investors for whom such
Dealer is the holder or dealer of record. The Distributor may from time to time
reduce the amount of the service fee paid to a Dealer with respect to Shares
sold prior to a certain date.

         5. In addition to fees payable pursuant to Sections 3 and 4 hereof, the
expenses permitted to be paid by the Fund pursuant to this Plan on or after the
Commencement Date shall include other distribution related expenses. These other
distribution related expenses may include, but are not limited to, a dealer
commission and a payment to wholesalers employed by the Distributor on net asset
value purchases at or above a certain dollar level.

         The aggregate amount of fees and expenses paid pursuant to Sections 3
and 4 hereof and this Section 5 shall not exceed 0.50% per annum of the average
daily net assets of the Fund attributable to the Shares. No fees shall be paid
pursuant to Section 4 hereof or this Section 5 to any insurance company which
has entered into an agreement with the Trust on behalf of the Fund and the
Distributor that permits such insurance company to purchase Shares from the Fund
at their net asset value in connection with annuity agreements issued in
connection with the insurance company's separate accounts. That portion of the
Fund's average daily net assets on which fees payable under Section 4 hereof and
this Section 5 are calculated may be subject to certain minimum amount
requirements as may be determined, and additional or different dealer or
wholesaler qualification standards that may be established, from time to time by
the Distributor. The Distributor shall be entitled to be paid any fees payable
under Section 4 hereof or this Section 5 with respect to accounts for which no
Dealer of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The fees and expenses payable pursuant to
Section 4 and this Section 5 may from time to time be paid by the Fund to the
Distributor and the Distributor will then pay these expenses on behalf of the
Fund.

         6. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         7. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of the Shares, and (b)
approval by a vote of the Board of Trustees and vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any of the
agreements related to the Plan (the "Qualified Trustees"), such votes to be cast
in person at a meeting called for the purpose of voting on this Plan.

         8. This Plan shall continue in effect indefinitely; provided, however,
that such continuance is subject to annual approval by a vote of the Board of
Trustees and a majority of the Qualified Trustees, such votes to be cast in
person at a meeting called for the purpose of voting on continuance of this
Plan.

         9. This Plan may be amended at any time by the Board of Trustees;
provided that (a) any amendment to increase materially the amount to be spent
for the services described herein shall be effective only upon approval by a
vote of a "majority of the outstanding voting securities" of the Shares and (b)
any material amendment of this Plan shall be effective only upon approval by a
vote of the Board of Trustees and a majority of the Qualified Trustees, such
votes to be cast in person at a meeting called for the purpose of voting on such
amendment. This Plan may be terminated at any time by vote of a majority of the
Qualified Trustees or by a vote of a "majority of the outstanding voting
securities" of the Shares.

         10. The Distributor shall provide the Board of Trustees, and the Board
of Trustees shall review, at least quarterly, a written report of the amounts
expended under the Plan and the purposes for which such expenditures were made.

         11. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         12. For the purposes of this Plan, the terms "interested person" and
"majority of the outstanding voting securities" are used as defined in the Act.
In addition, for purposes of determining the fees payable to Dealers and
wholesalers, the value of the Share's net assets shall be computed in the manner
specified in the Fund's then current prospectus for computation of the net asset
value of the Shares.

         13. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in Section 10 hereof (collectively
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such Record shall be kept in an easily
accessible place for the first two years of said record keeping.

         14. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         15. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                              MFS CORE GROWTH FUND

                                DISTRIBUTION PLAN

DISTRIBUTION PLAN with respect to the shares of beneficial interest to be
designated "CLASS A" of the MFS CORE GROWTH FUND (the "Fund"), a series of MFS
Series Trust I (the "Trust"), a business trust organized and existing under the
laws of The Commonwealth of Massachusetts, dated this 2nd day of January, 1996.

                                   WITNESSETH:

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

WHEREAS, the Trust intends to distribute the Shares of Beneficial Interest
(without par value) of the Fund designated Class A Shares (the "Shares") in part
in accordance with Rule 12b-1 under the Act, ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") in a form approved by the Board of Trustees of the Trust (the "Board
of Trustees") in the manner specified in Rule 12b-1, with MFS Fund Distributors,
Inc., a Delaware corporation, as distributor (the "Distributor"), whereby the
Distributor provides facilities and personnel and renders services to the Fund
in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that the Distributor will enter into
agreements ("Dealer Agreements") with various securities dealers and other
financial intermediaries ("Dealers") pursuant to which the Dealers will act as
dealers of the Shares in connection with the offering of Shares; and

WHEREAS, the Distribution Agreement provides that a sales charge may be paid by
investors who purchase Shares and that the Distributor and Dealers will receive
such sales charge as partial compensation for their services in connection with
sale of Shares; and

WHEREAS, the Board of Trustees, in considering whether the Fund should adopt and
implement this Plan, has evaluated such information as it deemed necessary to an
informed determination as to whether this Plan should be adopted and implemented
and has considered such pertinent factors as it deemed necessary to form the
basis for a decision to use assets of the Fund for such purposes, and has
determined that there is a reasonable likelihood that the adoption and
implementation of this Plan will benefit the Fund and its Class A shareholders;

NOW, THEREFORE, the Board of Trustees hereby adopts this Plan for the Fund as a
plan of distribution relating to the Shares in accordance with Rule 12b-1 under
the Act, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
ongoing maintenance commissions to Dealers (excluding service fees described in
paragraph 4), all expenses of printing (excluding typesetting) and distributing
prospectuses to prospective shareholders and providing such other related
services as are reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses
described in Section 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. As partial consideration for the services performed as specified in
the Distribution Agreement and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.25% per annum of the
average daily net assets of the Fund attributable to the Shares. Such payments
shall commence following shareholder approval of the Plan but only upon
notification by the Distributor to the Fund of the commencement of the Plan (the
"Commencement Date"). All or a portion of the distribution fee paid by the Fund
to the Distributor may be paid by the Distributor to Dealers in consideration of
the Dealer's services as a dealer of the Shares. The Distributor may from time
to time establish minimum amount requirements and additional or different dealer
qualification standards or other criteria to be met by dealers for payment of
any fee under this paragraph 3. It is understood that the Distributor may, but
is not required to, pay reduced fees or no fees under this paragraph 3 to
Dealers with respect to assets represented by Shares that have converted from
shares of beneficial interest of the Fund designated "Class B."

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its Dealer Agreement, the Fund shall on or after the
Commencement Date pay each Dealer a service fee periodically at a rate not to
exceed 0.25% per annum of the portion of the average daily net assets of the
Fund that is represented by Shares that are owned by investors for whom such
Dealer is the holder or dealer of record. The Distributor may from time to time
reduce the amount of the service fee paid to a Dealer with respect to Shares
sold prior to a certain date.

         5. In addition to fees payable pursuant to Sections 3 and 4 hereof, the
expenses permitted to be paid by the Fund pursuant to this Plan on or after the
Commencement Date shall include other distribution related expenses. These other
distribution related expenses may include, but are not limited to, a dealer
commission and a payment to wholesalers employed by the Distributor on net asset
value purchases at or above a certain dollar level.

         The aggregate amount of fees and expenses paid pursuant to Sections 3
and 4 hereof and this Section 5 shall not exceed 0.50% per annum of the average
daily net assets of the Fund attributable to the Shares. No fees shall be paid
pursuant to Section 4 hereof or this Section 5 to any insurance company which
has entered into an agreement with the Trust on behalf of the Fund and the
Distributor that permits such insurance company to purchase Shares from the Fund
at their net asset value in connection with annuity agreements issued in
connection with the insurance company's separate accounts. That portion of the
Fund's average daily net assets on which fees payable under Section 4 hereof and
this Section 5 are calculated may be subject to certain minimum amount
requirements as may be determined, and additional or different dealer or
wholesaler qualification standards that may be established, from time to time by
the Distributor. The Distributor shall be entitled to be paid any fees payable
under Section 4 hereof or this Section 5 with respect to accounts for which no
Dealer of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The fees and expenses payable pursuant to
Section 4 and this Section 5 may from time to time be paid by the Fund to the
Distributor and the Distributor will then pay these expenses on behalf of the
Fund.

         6. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         7. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of the Shares, and (b)
approval by a vote of the Board of Trustees and vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any of the
agreements related to the Plan (the "Qualified Trustees"), such votes to be cast
in person at a meeting called for the purpose of voting on this Plan.

         8. This Plan shall continue in effect indefinitely; provided, however,
that such continuance is subject to annual approval by a vote of the Board of
Trustees and a majority of the Qualified Trustees, such votes to be cast in
person at a meeting called for the purpose of voting on continuance of this
Plan.

         9. This Plan may be amended at any time by the Board of Trustees;
provided that (a) any amendment to increase materially the amount to be spent
for the services described herein shall be effective only upon approval by a
vote of a "majority of the outstanding voting securities" of the Shares and (b)
any material amendment of this Plan shall be effective only upon approval by a
vote of the Board of Trustees and a majority of the Qualified Trustees, such
votes to be cast in person at a meeting called for the purpose of voting on such
amendment. This Plan may be terminated at any time by vote of a majority of the
Qualified Trustees or by a vote of a "majority of the outstanding voting
securities" of the Shares.

         10. The Distributor shall provide the Board of Trustees, and the Board
of Trustees shall review, at least quarterly, a written report of the amounts
expended under the Plan and the purposes for which such expenditures were made.

         11. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         12. For the purposes of this Plan, the terms "interested person" and
"majority of the outstanding voting securities" are used as defined in the Act.
In addition, for purposes of determining the fees payable to Dealers and
wholesalers, the value of the Share's net assets shall be computed in the manner
specified in the Fund's then current prospectus for computation of the net asset
value of the Shares.

         13. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in Section 10 hereof (collectively
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such Record shall be kept in an easily
accessible place for the first two years of said record keeping.

         14. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         15. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                           MFS AGGRESSIVE GROWTH FUND

                                DISTRIBUTION PLAN

DISTRIBUTION PLAN with respect to the shares of beneficial interest to be
designated "CLASS A" of the MFS AGGRESSIVE GROWTH FUND (the "Fund"), a series of
MFS Series Trust I (the "Trust"), a business trust organized and existing under
the laws of The Commonwealth of Massachusetts, dated this 2nd day of January,
1996.

                                   WITNESSETH:

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

WHEREAS, the Trust intends to distribute the Shares of Beneficial Interest
(without par value) of the Fund designated Class A Shares (the "Shares") in part
in accordance with Rule 12b-1 under the Act, ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") in a form approved by the Board of Trustees of the Trust (the "Board
of Trustees") in the manner specified in Rule 12b-1, with MFS Fund Distributors,
Inc., a Delaware corporation, as distributor (the "Distributor"), whereby the
Distributor provides facilities and personnel and renders services to the Fund
in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that the Distributor will enter into
agreements ("Dealer Agreements") with various securities dealers and other
financial intermediaries ("Dealers") pursuant to which the Dealers will act as
dealers of the Shares in connection with the offering of Shares; and

WHEREAS, the Distribution Agreement provides that a sales charge may be paid by
investors who purchase Shares and that the Distributor and Dealers will receive
such sales charge as partial compensation for their services in connection with
sale of Shares; and

WHEREAS, the Board of Trustees, in considering whether the Fund should adopt and
implement this Plan, has evaluated such information as it deemed necessary to an
informed determination as to whether this Plan should be adopted and implemented
and has considered such pertinent factors as it deemed necessary to form the
basis for a decision to use assets of the Fund for such purposes, and has
determined that there is a reasonable likelihood that the adoption and
implementation of this Plan will benefit the Fund and its Class A shareholders;

NOW, THEREFORE, the Board of Trustees hereby adopts this Plan for the Fund as a
plan of distribution relating to the Shares in accordance with Rule 12b-1 under
the Act, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
ongoing maintenance commissions to Dealers (excluding service fees described in
paragraph 4), all expenses of printing (excluding typesetting) and distributing
prospectuses to prospective shareholders and providing such other related
services as are reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses
described in Section 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. As partial consideration for the services performed as specified in
the Distribution Agreement and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.25% per annum of the
average daily net assets of the Fund attributable to the Shares. Such payments
shall commence following shareholder approval of the Plan but only upon
notification by the Distributor to the Fund of the commencement of the Plan (the
"Commencement Date"). All or a portion of the distribution fee paid by the Fund
to the Distributor may be paid by the Distributor to Dealers in consideration of
the Dealer's services as a dealer of the Shares. The Distributor may from time
to time establish minimum amount requirements and additional or different dealer
qualification standards or other criteria to be met by dealers for payment of
any fee under this paragraph 3. It is understood that the Distributor may, but
is not required to, pay reduced fees or no fees under this paragraph 3 to
Dealers with respect to assets represented by Shares that have converted from
shares of beneficial interest of the Fund designated "Class B."

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its Dealer Agreement, the Fund shall on or after the
Commencement Date pay each Dealer a service fee periodically at a rate not to
exceed 0.25% per annum of the portion of the average daily net assets of the
Fund that is represented by Shares that are owned by investors for whom such
Dealer is the holder or dealer of record. The Distributor may from time to time
reduce the amount of the service fee paid to a Dealer with respect to Shares
sold prior to a certain date.

         5. In addition to fees payable pursuant to Sections 3 and 4 hereof, the
expenses permitted to be paid by the Fund pursuant to this Plan on or after the
Commencement Date shall include other distribution related expenses. These other
distribution related expenses may include, but are not limited to, a dealer
commission and a payment to wholesalers employed by the Distributor on net asset
value purchases at or above a certain dollar level.

         The aggregate amount of fees and expenses paid pursuant to Sections 3
and 4 hereof and this Section 5 shall not exceed 0.50% per annum of the average
daily net assets of the Fund attributable to the Shares. No fees shall be paid
pursuant to Section 4 hereof or this Section 5 to any insurance company which
has entered into an agreement with the Trust on behalf of the Fund and the
Distributor that permits such insurance company to purchase Shares from the Fund
at their net asset value in connection with annuity agreements issued in
connection with the insurance company's separate accounts. That portion of the
Fund's average daily net assets on which fees payable under Section 4 hereof and
this Section 5 are calculated may be subject to certain minimum amount
requirements as may be determined, and additional or different dealer or
wholesaler qualification standards that may be established, from time to time by
the Distributor. The Distributor shall be entitled to be paid any fees payable
under Section 4 hereof or this Section 5 with respect to accounts for which no
Dealer of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The fees and expenses payable pursuant to
Section 4 and this Section 5 may from time to time be paid by the Fund to the
Distributor and the Distributor will then pay these expenses on behalf of the
Fund.

         6. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         7. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of the Shares, and (b)
approval by a vote of the Board of Trustees and vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any of the
agreements related to the Plan (the "Qualified Trustees"), such votes to be cast
in person at a meeting called for the purpose of voting on this Plan.

         8. This Plan shall continue in effect indefinitely; provided, however,
that such continuance is subject to annual approval by a vote of the Board of
Trustees and a majority of the Qualified Trustees, such votes to be cast in
person at a meeting called for the purpose of voting on continuance of this
Plan.

         9. This Plan may be amended at any time by the Board of Trustees;
provided that (a) any amendment to increase materially the amount to be spent
for the services described herein shall be effective only upon approval by a
vote of a "majority of the outstanding voting securities" of the Shares and (b)
any material amendment of this Plan shall be effective only upon approval by a
vote of the Board of Trustees and a majority of the Qualified Trustees, such
votes to be cast in person at a meeting called for the purpose of voting on such
amendment. This Plan may be terminated at any time by vote of a majority of the
Qualified Trustees or by a vote of a "majority of the outstanding voting
securities" of the Shares.

         10. The Distributor shall provide the Board of Trustees, and the Board
of Trustees shall review, at least quarterly, a written report of the amounts
expended under the Plan and the purposes for which such expenditures were made.

         11. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         12. For the purposes of this Plan, the terms "interested person" and
"majority of the outstanding voting securities" are used as defined in the Act.
In addition, for purposes of determining the fees payable to Dealers and
wholesalers, the value of the Share's net assets shall be computed in the manner
specified in the Fund's then current prospectus for computation of the net asset
value of the Shares.

         13. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in Section 10 hereof (collectively
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such Record shall be kept in an easily
accessible place for the first two years of said record keeping.

         14. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         15. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                         MFS SPECIAL OPPORTUNITIES FUND

                                DISTRIBUTION PLAN

DISTRIBUTION PLAN with respect to the shares of beneficial interest to be
designated "CLASS A" of the MFS SPECIAL OPPORTUNITIES FUND (the "Fund"), a
series of MFS Series Trust I (the "Trust"), a business trust organized and
existing under the laws of The Commonwealth of Massachusetts, dated this 2nd day
of January, 1996.

                                   WITNESSETH:

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

WHEREAS, the Trust intends to distribute the Shares of Beneficial Interest
(without par value) of the Fund designated Class A Shares (the "Shares") in part
in accordance with Rule 12b-1 under the Act, ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") in a form approved by the Board of Trustees of the Trust (the "Board
of Trustees") in the manner specified in Rule 12b-1, with MFS Fund Distributors,
Inc., a Delaware corporation, as distributor (the "Distributor"), whereby the
Distributor provides facilities and personnel and renders services to the Fund
in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that the Distributor will enter into
agreements ("Dealer Agreements") with various securities dealers and other
financial intermediaries ("Dealers") pursuant to which the Dealers will act as
dealers of the Shares in connection with the offering of Shares; and

WHEREAS, the Distribution Agreement provides that a sales charge may be paid by
investors who purchase Shares and that the Distributor and Dealers will receive
such sales charge as partial compensation for their services in connection with
sale of Shares; and

WHEREAS, the Board of Trustees, in considering whether the Fund should adopt and
implement this Plan, has evaluated such information as it deemed necessary to an
informed determination as to whether this Plan should be adopted and implemented
and has considered such pertinent factors as it deemed necessary to form the
basis for a decision to use assets of the Fund for such purposes, and has
determined that there is a reasonable likelihood that the adoption and
implementation of this Plan will benefit the Fund and its Class A shareholders;

NOW, THEREFORE, the Board of Trustees hereby adopts this Plan for the Fund as a
plan of distribution relating to the Shares in accordance with Rule 12b-1 under
the Act, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
ongoing maintenance commissions to Dealers (excluding service fees described in
paragraph 4), all expenses of printing (excluding typesetting) and distributing
prospectuses to prospective shareholders and providing such other related
services as are reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses
described in Section 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. As partial consideration for the services performed as specified in
the Distribution Agreement and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.25% per annum of the
average daily net assets of the Fund attributable to the Shares. Such payments
shall commence following shareholder approval of the Plan but only upon
notification by the Distributor to the Fund of the commencement of the Plan (the
"Commencement Date"). All or a portion of the distribution fee paid by the Fund
to the Distributor may be paid by the Distributor to Dealers in consideration of
the Dealer's services as a dealer of the Shares. The Distributor may from time
to time establish minimum amount requirements and additional or different dealer
qualification standards or other criteria to be met by dealers for payment of
any fee under this paragraph 3. It is understood that the Distributor may, but
is not required to, pay reduced fees or no fees under this paragraph 3 to
Dealers with respect to assets represented by Shares that have converted from
shares of beneficial interest of the Fund designated "Class B."

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its Dealer Agreement, the Fund shall on or after the
Commencement Date pay each Dealer a service fee periodically at a rate not to
exceed 0.25% per annum of the portion of the average daily net assets of the
Fund that is represented by Shares that are owned by investors for whom such
Dealer is the holder or dealer of record. The Distributor may from time to time
reduce the amount of the service fee paid to a Dealer with respect to Shares
sold prior to a certain date.

         5. In addition to fees payable pursuant to Sections 3 and 4 hereof, the
expenses permitted to be paid by the Fund pursuant to this Plan on or after the
Commencement Date shall include other distribution related expenses. These other
distribution related expenses may include, but are not limited to, a dealer
commission and a payment to wholesalers employed by the Distributor on net asset
value purchases at or above a certain dollar level.

         The aggregate amount of fees and expenses paid pursuant to Sections 3
and 4 hereof and this Section 5 shall not exceed 0.50% per annum of the average
daily net assets of the Fund attributable to the Shares. No fees shall be paid
pursuant to Section 4 hereof or this Section 5 to any insurance company which
has entered into an agreement with the Trust on behalf of the Fund and the
Distributor that permits such insurance company to purchase Shares from the Fund
at their net asset value in connection with annuity agreements issued in
connection with the insurance company's separate accounts. That portion of the
Fund's average daily net assets on which fees payable under Section 4 hereof and
this Section 5 are calculated may be subject to certain minimum amount
requirements as may be determined, and additional or different dealer or
wholesaler qualification standards that may be established, from time to time by
the Distributor. The Distributor shall be entitled to be paid any fees payable
under Section 4 hereof or this Section 5 with respect to accounts for which no
Dealer of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The fees and expenses payable pursuant to
Section 4 and this Section 5 may from time to time be paid by the Fund to the
Distributor and the Distributor will then pay these expenses on behalf of the
Fund.

         6. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         7. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of the Shares, and (b)
approval by a vote of the Board of Trustees and vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any of the
agreements related to the Plan (the "Qualified Trustees"), such votes to be cast
in person at a meeting called for the purpose of voting on this Plan.

         8. This Plan shall continue in effect indefinitely; provided, however,
that such continuance is subject to annual approval by a vote of the Board of
Trustees and a majority of the Qualified Trustees, such votes to be cast in
person at a meeting called for the purpose of voting on continuance of this
Plan.

         9. This Plan may be amended at any time by the Board of Trustees;
provided that (a) any amendment to increase materially the amount to be spent
for the services described herein shall be effective only upon approval by a
vote of a "majority of the outstanding voting securities" of the Shares and (b)
any material amendment of this Plan shall be effective only upon approval by a
vote of the Board of Trustees and a majority of the Qualified Trustees, such
votes to be cast in person at a meeting called for the purpose of voting on such
amendment. This Plan may be terminated at any time by vote of a majority of the
Qualified Trustees or by a vote of a "majority of the outstanding voting
securities" of the Shares.

         10. The Distributor shall provide the Board of Trustees, and the Board
of Trustees shall review, at least quarterly, a written report of the amounts
expended under the Plan and the purposes for which such expenditures were made.

         11. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         12. For the purposes of this Plan, the terms "interested person" and
"majority of the outstanding voting securities" are used as defined in the Act.
In addition, for purposes of determining the fees payable to Dealers and
wholesalers, the value of the Share's net assets shall be computed in the manner
specified in the Fund's then current prospectus for computation of the net asset
value of the Shares.

         13. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in Section 10 hereof (collectively
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such Record shall be kept in an easily
accessible place for the first two years of said record keeping.

         14. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         15. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


                                                            EXHIBIT NO. 99.15(i)

                               MFS SERIES TRUST I

                             MFS EQUITY INCOME FUND

                              PLAN OF DISTRIBUTION

PLAN OF DISTRIBUTION with respect to the shares of beneficial interest to be
designated "CLASS B" of the MFS EQUITY INCOME FUND (the "Fund"), a series of MFS
Series Trust I (the "Trust") a Massachusetts business trust, dated this 2nd day
January, 1996.

                                   WITNESSETH:

WHEREAS, the Trust is engaged in business as an open-end management investment
company and is registered under the Investment Company Act of 1940, as amended
(collectively with the rules and regulations promulgated thereunder, the "1940
Act"); and

WHEREAS, the Trust intends to distribute the shares of beneficial interest
(without par value) of the Fund designated Class B Shares (the "Shares") in
accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") (in a form approved by the Board of Trustees of the Trust in a
manner specified in such Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that (a) the Distributor may retain the
services of firms or individuals to act as dealers (the "Dealers") of the Shares
in connection with the offering of Shares, and (b) the Distributor may make
payments for such services to the Dealers out of the fee paid to the Distributor
hereunder, any deferred sales charges imposed by the Distributor in connection
with the repurchase of Shares, its profits or any other source available to it;
and

WHEREAS, the Trust recognizes and agrees that the Distributor may impose certain
deferred sales charges in connection with the repurchase of Shares by the Fund,
and the Distributor may retain (or receive from the Fund, as the case may be)
all such deferred sales charges; and

WHEREAS, the Board of Trustees of the Trust, in considering whether the Fund
should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class B
shareholders;

NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this Plan for
the Fund as a plan for distribution relating to the Shares in accordance with
Rule 12b-1, on the following terms and conditions:

1. As specified in the Distribution Agreement, the Distributor shall provide
facilities, personnel and a program with respect to the offering and sale of
Shares. Among other things, the Distributor shall be responsible for commissions
payable to Dealers, all expenses of printing (excluding typesetting) and
distributing prospectuses to prospective shareholders and providing such other
related services as are reasonably necessary in connection therewith.

2. The Distributor shall bear all distribution-related expenses to the extent
specified in the Distribution Agreement in providing the services described in
paragraph 1, including without limitation, the compensation of personnel
necessary to provide such services and all costs of travel, office expenses
(including rent and overhead), equipment, printing, delivery and mailing costs.

3. It is understood that the Distributor may impose certain deferred sales
charges in connection with the repurchase of Shares by the Fund and the
Distributor may retain (or receive from the Fund, as the case may be) all such
deferred sales charges. As additional consideration for all services performed
and expenses incurred in the performance of its obligations under the
Distribution Agreement, the Fund shall pay the Distributor a distribution fee
periodically at a rate of 0.75% per annum of the Fund's average daily net assets
attributable to the shares.

4. As partial consideration for the personal services and/or account maintenance
services performed by each Dealer in the performance of its obligations under
its dealer agreement with the Distributor, the Fund shall pay each Dealer a
service fee periodically at a rate not to exceed 0.25% per annum of the portion
of the average daily net assets of the Fund that is represented by Shares that
are owned by investors for whom such Dealer is the holder or dealer of record.
That portion of the Fund's average daily net assets on which the fees payable
under this paragraph 4 hereof are calculated may be subject to certain minimum
amount requirements as may be determined, and additional or different dealer
qualification standards that may be established from time to time, by the
Distributor. The Distributor shall be entitled to be paid any fees payable under
this paragraph 4 hereof with respect to Shares for which no Dealer of record
exists or qualification standards have not been met as partial consideration for
personal services and/or account maintenance services provided by the
Distributor to the Shares. The service fee payable pursuant to this paragraph 4
may from time to time be paid by the Fund to the Distributor and the Distributor
will then pay these fees on behalf of the Fund.

5. The Fund understands that agreements between the Distributor and the Dealers
may provide for payment of commissions to Dealers in connection with the sales
of Shares and may provide for a portion (which may be all or substantially all)
of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

6. The Fund shall pay all fees and expenses of any independent auditor, legal
counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

7. Nothing herein contained shall be deemed to require the Trust to take any
action contrary to its Declaration of Trust or By-Laws or any applicable
statutory or regulatory requirement to which it is subject or by which it is
bound, or to relieve or deprive the Board of Trustees of the responsibility for
and control of the conduct of the affairs of the Fund.

8. This Plan shall become effective upon (a) approval by a vote of at least a
"majority of the outstanding voting securities" of the Shares, and (b) approval
by a vote of the Board of Trustees and a vote of a majority of the Trustees who
are not "interested persons" of the Trust and who have no direct or indirect
financial interest in the operation of the Plan or in any agreement related to
the Plan (the "Qualified Trustees"), such votes to be cast in person at a
meeting called for the purpose of voting on this Plan.

9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

10. This Plan may be amended at any time by the Board of Trustees; provided that
this Plan may not be amended to increase materially the amount of permitted
expenses hereunder without the approval of holders of a "majority of the
outstanding voting securities" of the Shares and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of the Shares.

11. The Fund and the Distributor shall provide the Board of Trustees, and the
Board of Trustees shall review, at least quarterly, a written report of the
amounts expended under this Plan and the purposes for which such expenditures
were made.

12. While this Plan is in effect, the selection and nomination of Qualified
Trustees shall be committed to the discretion of the Trustees who are not
"interested persons" of the Trust.

13. For the purposes of this Plan, the terms "interested persons", "majority of
the outstanding voting securities" and "specifically approved at least annually"
are used as defined in the 1940 Act. In addition, for purposes of determining
the fees payable to the Distributor hereunder, the value of the Fund's net
assets shall be computed in the manner specified in the Fund's then current
prospectus and statement of additional information for computation of the net
asset value of the Shares of the Fund.

14. The Trust shall preserve copies of this Plan, and each agreement related
hereto and each report referred to in paragraph 11 hereof (collectively, the
"Records") for a period of six years from the end of the fiscal year in which
such Record was made and each such record shall be kept in an easily accessible
place for the first two years of said record-keeping.

15. This Plan shall be construed in accordance with the laws of The Commonwealth
of Massachusetts and the applicable provisions of the 1940 Act.

16. If any provision of this Plan shall be held or made invalid by a court
decision, statute, rule or otherwise, the remainder of the Plan shall not be
affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                       MFS RESEARCH GROWTH AND INCOME FUND

                              PLAN OF DISTRIBUTION

PLAN OF DISTRIBUTION with respect to the shares of beneficial interest to be
designated "CLASS B" of the MFS RESEARCH GROWTH AND INCOME FUND (the "Fund"), a
series of MFS Series Trust I (the "Trust") a Massachusetts business trust, dated
this 2nd day January, 1996.

                                   WITNESSETH:

WHEREAS, the Trust is engaged in business as an open-end management investment
company and is registered under the Investment Company Act of 1940, as amended
(collectively with the rules and regulations promulgated thereunder, the "1940
Act"); and

WHEREAS, the Trust intends to distribute the shares of beneficial interest
(without par value) of the Fund designated Class B Shares (the "Shares") in
accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") (in a form approved by the Board of Trustees of the Trust in a
manner specified in such Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that (a) the Distributor may retain the
services of firms or individuals to act as dealers (the "Dealers") of the Shares
in connection with the offering of Shares, and (b) the Distributor may make
payments for such services to the Dealers out of the fee paid to the Distributor
hereunder, any deferred sales charges imposed by the Distributor in connection
with the repurchase of Shares, its profits or any other source available to it;
and

WHEREAS, the Trust recognizes and agrees that the Distributor may impose certain
deferred sales charges in connection with the repurchase of Shares by the Fund,
and the Distributor may retain (or receive from the Fund, as the case may be)
all such deferred sales charges; and

WHEREAS, the Board of Trustees of the Trust, in considering whether the Fund
should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class B
shareholders;

NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this Plan for
the Fund as a plan for distribution relating to the Shares in accordance with
Rule 12b-1, on the following terms and conditions:

1. As specified in the Distribution Agreement, the Distributor shall provide
facilities, personnel and a program with respect to the offering and sale of
Shares. Among other things, the Distributor shall be responsible for commissions
payable to Dealers, all expenses of printing (excluding typesetting) and
distributing prospectuses to prospective shareholders and providing such other
related services as are reasonably necessary in connection therewith.

2. The Distributor shall bear all distribution-related expenses to the extent
specified in the Distribution Agreement in providing the services described in
paragraph 1, including without limitation, the compensation of personnel
necessary to provide such services and all costs of travel, office expenses
(including rent and overhead), equipment, printing, delivery and mailing costs.

3. It is understood that the Distributor may impose certain deferred sales
charges in connection with the repurchase of Shares by the Fund and the
Distributor may retain (or receive from the Fund, as the case may be) all such
deferred sales charges. As additional consideration for all services performed
and expenses incurred in the performance of its obligations under the
Distribution Agreement, the Fund shall pay the Distributor a distribution fee
periodically at a rate of 0.75% per annum of the Fund's average daily net assets
attributable to the shares.

4. As partial consideration for the personal services and/or account maintenance
services performed by each Dealer in the performance of its obligations under
its dealer agreement with the Distributor, the Fund shall pay each Dealer a
service fee periodically at a rate not to exceed 0.25% per annum of the portion
of the average daily net assets of the Fund that is represented by Shares that
are owned by investors for whom such Dealer is the holder or dealer of record.
That portion of the Fund's average daily net assets on which the fees payable
under this paragraph 4 hereof are calculated may be subject to certain minimum
amount requirements as may be determined, and additional or different dealer
qualification standards that may be established from time to time, by the
Distributor. The Distributor shall be entitled to be paid any fees payable under
this paragraph 4 hereof with respect to Shares for which no Dealer of record
exists or qualification standards have not been met as partial consideration for
personal services and/or account maintenance services provided by the
Distributor to the Shares. The service fee payable pursuant to this paragraph 4
may from time to time be paid by the Fund to the Distributor and the Distributor
will then pay these fees on behalf of the Fund.

5. The Fund understands that agreements between the Distributor and the Dealers
may provide for payment of commissions to Dealers in connection with the sales
of Shares and may provide for a portion (which may be all or substantially all)
of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

6. The Fund shall pay all fees and expenses of any independent auditor, legal
counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

7. Nothing herein contained shall be deemed to require the Trust to take any
action contrary to its Declaration of Trust or By-Laws or any applicable
statutory or regulatory requirement to which it is subject or by which it is
bound, or to relieve or deprive the Board of Trustees of the responsibility for
and control of the conduct of the affairs of the Fund.

8. This Plan shall become effective upon (a) approval by a vote of at least a
"majority of the outstanding voting securities" of the Shares, and (b) approval
by a vote of the Board of Trustees and a vote of a majority of the Trustees who
are not "interested persons" of the Trust and who have no direct or indirect
financial interest in the operation of the Plan or in any agreement related to
the Plan (the "Qualified Trustees"), such votes to be cast in person at a
meeting called for the purpose of voting on this Plan.

9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

10. This Plan may be amended at any time by the Board of Trustees; provided that
this Plan may not be amended to increase materially the amount of permitted
expenses hereunder without the approval of holders of a "majority of the
outstanding voting securities" of the Shares and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of the Shares.

11. The Fund and the Distributor shall provide the Board of Trustees, and the
Board of Trustees shall review, at least quarterly, a written report of the
amounts expended under this Plan and the purposes for which such expenditures
were made.

12. While this Plan is in effect, the selection and nomination of Qualified
Trustees shall be committed to the discretion of the Trustees who are not
"interested persons" of the Trust.

13. For the purposes of this Plan, the terms "interested persons", "majority of
the outstanding voting securities" and "specifically approved at least annually"
are used as defined in the 1940 Act. In addition, for purposes of determining
the fees payable to the Distributor hereunder, the value of the Fund's net
assets shall be computed in the manner specified in the Fund's then current
prospectus and statement of additional information for computation of the net
asset value of the Shares of the Fund.

14. The Trust shall preserve copies of this Plan, and each agreement related
hereto and each report referred to in paragraph 11 hereof (collectively, the
"Records") for a period of six years from the end of the fiscal year in which
such Record was made and each such record shall be kept in an easily accessible
place for the first two years of said record-keeping.

15. This Plan shall be construed in accordance with the laws of The Commonwealth
of Massachusetts and the applicable provisions of the 1940 Act.

16. If any provision of this Plan shall be held or made invalid by a court
decision, statute, rule or otherwise, the remainder of the Plan shall not be
affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                              MFS CORE GROWTH FUND

                              PLAN OF DISTRIBUTION

PLAN OF DISTRIBUTION with respect to the shares of beneficial interest to be
designated "CLASS B" of the MFS CORE GROWTH FUND (the "Fund"), a series of MFS
Series Trust I (the "Trust") a Massachusetts business trust, dated this 2nd day
January, 1996.

                                   WITNESSETH:

WHEREAS, the Trust is engaged in business as an open-end management investment
company and is registered under the Investment Company Act of 1940, as amended
(collectively with the rules and regulations promulgated thereunder, the "1940
Act"); and

WHEREAS, the Trust intends to distribute the shares of beneficial interest
(without par value) of the Fund designated Class B Shares (the "Shares") in
accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") (in a form approved by the Board of Trustees of the Trust in a
manner specified in such Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that (a) the Distributor may retain the
services of firms or individuals to act as dealers (the "Dealers") of the Shares
in connection with the offering of Shares, and (b) the Distributor may make
payments for such services to the Dealers out of the fee paid to the Distributor
hereunder, any deferred sales charges imposed by the Distributor in connection
with the repurchase of Shares, its profits or any other source available to it;
and

WHEREAS, the Trust recognizes and agrees that the Distributor may impose certain
deferred sales charges in connection with the repurchase of Shares by the Fund,
and the Distributor may retain (or receive from the Fund, as the case may be)
all such deferred sales charges; and

WHEREAS, the Board of Trustees of the Trust, in considering whether the Fund
should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class B
shareholders;

NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this Plan for
the Fund as a plan for distribution relating to the Shares in accordance with
Rule 12b-1, on the following terms and conditions:

1. As specified in the Distribution Agreement, the Distributor shall provide
facilities, personnel and a program with respect to the offering and sale of
Shares. Among other things, the Distributor shall be responsible for commissions
payable to Dealers, all expenses of printing (excluding typesetting) and
distributing prospectuses to prospective shareholders and providing such other
related services as are reasonably necessary in connection therewith.

2. The Distributor shall bear all distribution-related expenses to the extent
specified in the Distribution Agreement in providing the services described in
paragraph 1, including without limitation, the compensation of personnel
necessary to provide such services and all costs of travel, office expenses
(including rent and overhead), equipment, printing, delivery and mailing costs.

3. It is understood that the Distributor may impose certain deferred sales
charges in connection with the repurchase of Shares by the Fund and the
Distributor may retain (or receive from the Fund, as the case may be) all such
deferred sales charges. As additional consideration for all services performed
and expenses incurred in the performance of its obligations under the
Distribution Agreement, the Fund shall pay the Distributor a distribution fee
periodically at a rate of 0.75% per annum of the Fund's average daily net assets
attributable to the shares.

4. As partial consideration for the personal services and/or account maintenance
services performed by each Dealer in the performance of its obligations under
its dealer agreement with the Distributor, the Fund shall pay each Dealer a
service fee periodically at a rate not to exceed 0.25% per annum of the portion
of the average daily net assets of the Fund that is represented by Shares that
are owned by investors for whom such Dealer is the holder or dealer of record.
That portion of the Fund's average daily net assets on which the fees payable
under this paragraph 4 hereof are calculated may be subject to certain minimum
amount requirements as may be determined, and additional or different dealer
qualification standards that may be established from time to time, by the
Distributor. The Distributor shall be entitled to be paid any fees payable under
this paragraph 4 hereof with respect to Shares for which no Dealer of record
exists or qualification standards have not been met as partial consideration for
personal services and/or account maintenance services provided by the
Distributor to the Shares. The service fee payable pursuant to this paragraph 4
may from time to time be paid by the Fund to the Distributor and the Distributor
will then pay these fees on behalf of the Fund.

5. The Fund understands that agreements between the Distributor and the Dealers
may provide for payment of commissions to Dealers in connection with the sales
of Shares and may provide for a portion (which may be all or substantially all)
of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

6. The Fund shall pay all fees and expenses of any independent auditor, legal
counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

7. Nothing herein contained shall be deemed to require the Trust to take any
action contrary to its Declaration of Trust or By-Laws or any applicable
statutory or regulatory requirement to which it is subject or by which it is
bound, or to relieve or deprive the Board of Trustees of the responsibility for
and control of the conduct of the affairs of the Fund.

8. This Plan shall become effective upon (a) approval by a vote of at least a
"majority of the outstanding voting securities" of the Shares, and (b) approval
by a vote of the Board of Trustees and a vote of a majority of the Trustees who
are not "interested persons" of the Trust and who have no direct or indirect
financial interest in the operation of the Plan or in any agreement related to
the Plan (the "Qualified Trustees"), such votes to be cast in person at a
meeting called for the purpose of voting on this Plan.

9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

10. This Plan may be amended at any time by the Board of Trustees; provided that
this Plan may not be amended to increase materially the amount of permitted
expenses hereunder without the approval of holders of a "majority of the
outstanding voting securities" of the Shares and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of the Shares.

11. The Fund and the Distributor shall provide the Board of Trustees, and the
Board of Trustees shall review, at least quarterly, a written report of the
amounts expended under this Plan and the purposes for which such expenditures
were made.

12. While this Plan is in effect, the selection and nomination of Qualified
Trustees shall be committed to the discretion of the Trustees who are not
"interested persons" of the Trust.

13. For the purposes of this Plan, the terms "interested persons", "majority of
the outstanding voting securities" and "specifically approved at least annually"
are used as defined in the 1940 Act. In addition, for purposes of determining
the fees payable to the Distributor hereunder, the value of the Fund's net
assets shall be computed in the manner specified in the Fund's then current
prospectus and statement of additional information for computation of the net
asset value of the Shares of the Fund.

14. The Trust shall preserve copies of  hereto and each report referred to in
paragraph 11 hereof (collectively, the "Records") for a period of six years from
the end of the fiscal year in which such Record was made and each such record
shall be kept in an easily accessible place for the first two years of said
record-keeping.

15. This Plan shall be construed in accordance with the laws of The Commonwealth
of Massachusetts and the applicable provisions of the 1940 Act.

16. If any provision of this Plan shall be held or made invalid by a court
decision, statute, rule or otherwise, the remainder of the Plan shall not be
affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                           MFS AGGRESSIVE GROWTH FUND

                              PLAN OF DISTRIBUTION

PLAN OF DISTRIBUTION with respect to the shares of beneficial interest to be
designated "CLASS B" of the MFS AGGRESSIVE GROWTH FUND (the "Fund"), a series of
MFS Series Trust I (the "Trust") a Massachusetts business trust, dated this 2nd
day January, 1996.

                                   WITNESSETH:

WHEREAS, the Trust is engaged in business as an open-end management investment
company and is registered under the Investment Company Act of 1940, as amended
(collectively with the rules and regulations promulgated thereunder, the "1940
Act"); and

WHEREAS, the Trust intends to distribute the shares of beneficial interest
(without par value) of the Fund designated Class B Shares (the "Shares") in
accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") (in a form approved by the Board of Trustees of the Trust in a
manner specified in such Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that (a) the Distributor may retain the
services of firms or individuals to act as dealers (the "Dealers") of the Shares
in connection with the offering of Shares, and (b) the Distributor may make
payments for such services to the Dealers out of the fee paid to the Distributor
hereunder, any deferred sales charges imposed by the Distributor in connection
with the repurchase of Shares, its profits or any other source available to it;
and

WHEREAS, the Trust recognizes and agrees that the Distributor may impose certain
deferred sales charges in connection with the repurchase of Shares by the Fund,
and the Distributor may retain (or receive from the Fund, as the case may be)
all such deferred sales charges; and

WHEREAS, the Board of Trustees of the Trust, in considering whether the Fund
should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class B
shareholders;

NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this Plan for
the Fund as a plan for distribution relating to the Shares in accordance with
Rule 12b-1, on the following terms and conditions:

1. As specified in the Distribution Agreement, the Distributor shall provide
facilities, personnel and a program with respect to the offering and sale of
Shares. Among other things, the Distributor shall be responsible for commissions
payable to Dealers, all expenses of printing (excluding typesetting) and
distributing prospectuses to prospective shareholders and providing such other
related services as are reasonably necessary in connection therewith.

2. The Distributor shall bear all distribution-related expenses to the extent
specified in the Distribution Agreement in providing the services described in
paragraph 1, including without limitation, the compensation of personnel
necessary to provide such services and all costs of travel, office expenses
(including rent and overhead), equipment, printing, delivery and mailing costs.

3. It is understood that the Distributor may impose certain deferred sales
charges in connection with the repurchase of Shares by the Fund and the
Distributor may retain (or receive from the Fund, as the case may be) all such
deferred sales charges. As additional consideration for all services performed
and expenses incurred in the performance of its obligations under the
Distribution Agreement, the Fund shall pay the Distributor a distribution fee
periodically at a rate of 0.75% per annum of the Fund's average daily net assets
attributable to the shares.

4. As partial consideration for the personal services and/or account maintenance
services performed by each Dealer in the performance of its obligations under
its dealer agreement with the Distributor, the Fund shall pay each Dealer a
service fee periodically at a rate not to exceed 0.25% per annum of the portion
of the average daily net assets of the Fund that is represented by Shares that
are owned by investors for whom such Dealer is the holder or dealer of record.
That portion of the Fund's average daily net assets on which the fees payable
under this paragraph 4 hereof are calculated may be subject to certain minimum
amount requirements as may be determined, and additional or different dealer
qualification standards that may be established from time to time, by the
Distributor. The Distributor shall be entitled to be paid any fees payable under
this paragraph 4 hereof with respect to Shares for which no Dealer of record
exists or qualification standards have not been met as partial consideration for
personal services and/or account maintenance services provided by the
Distributor to the Shares. The service fee payable pursuant to this paragraph 4
may from time to time be paid by the Fund to the Distributor and the Distributor
will then pay these fees on behalf of the Fund.

5. The Fund understands that agreements between the Distributor and the Dealers
may provide for payment of commissions to Dealers in connection with the sales
of Shares and may provide for a portion (which may be all or substantially all)
of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

6. The Fund shall pay all fees and expenses of any independent auditor, legal
counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

7. Nothing herein contained shall be deemed to require the Trust to take any
action contrary to its Declaration of Trust or By-Laws or any applicable
statutory or regulatory requirement to which it is subject or by which it is
bound, or to relieve or deprive the Board of Trustees of the responsibility for
and control of the conduct of the affairs of the Fund.

8. This Plan shall become effective upon (a) approval by a vote of at least a
"majority of the outstanding voting securities" of the Shares, and (b) approval
by a vote of the Board of Trustees and a vote of a majority of the Trustees who
are not "interested persons" of the Trust and who have no direct or indirect
financial interest in the operation of the Plan or in any agreement related to
the Plan (the "Qualified Trustees"), such votes to be cast in person at a
meeting called for the purpose of voting on this Plan.

9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

10. This Plan may be amended at any time by the Board of Trustees; provided that
this Plan may not be amended to increase materially the amount of permitted
expenses hereunder without the approval of holders of a "majority of the
outstanding voting securities" of the Shares and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of the Shares.

11. The Fund and the Distributor shall provide the Board of Trustees, and the
Board of Trustees shall review, at least quarterly, a written report of the
amounts expended under this Plan and the purposes for which such expenditures
were made.

12. While this Plan is in effect, the selection and nomination of Qualified
Trustees shall be committed to the discretion of the Trustees who are not
"interested persons" of the Trust.

13. For the purposes of this Plan, the terms "interested persons", "majority of
the outstanding voting securities" and "specifically approved at least annually"
are used as defined in the 1940 Act. In addition, for purposes of determining
the fees payable to the Distributor hereunder, the value of the Fund's net
assets shall be computed in the manner specified in the Fund's then current
prospectus and statement of additional information for computation of the net
asset value of the Shares of the Fund.

14. The Trust shall preserve copies of this Plan, and each agreement related
hereto and each report referred to in paragraph 11 hereof (collectively, the
"Records") for a period of six years from the end of the fiscal year in which
such Record was made and each such record shall be kept in an easily accessible
place for the first two years of said record-keeping.

15. This Plan shall be construed in accordance with the laws of The Commonwealth
of Massachusetts and the applicable provisions of the 1940 Act.

16. If any provision of this Plan shall be held or made invalid by a court
decision, statute, rule or otherwise, the remainder of the Plan shall not be
affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                         MFS SPECIAL OPPORTUNITIES FUND

                              PLAN OF DISTRIBUTION

PLAN OF DISTRIBUTION with respect to the shares of beneficial interest to be
designated "CLASS B" of the MFS SPECIAL OPPORTUNITIES FUND (the "Fund"), a
series of MFS Series Trust I (the "Trust") a Massachusetts business trust, dated
this 2nd day January, 1996.

                                   WITNESSETH:

WHEREAS, the Trust is engaged in business as an open-end management investment
company and is registered under the Investment Company Act of 1940, as amended
(collectively with the rules and regulations promulgated thereunder, the "1940
Act"); and

WHEREAS, the Trust intends to distribute the shares of beneficial interest
(without par value) of the Fund designated Class B Shares (the "Shares") in
accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

WHEREAS, the Trust has entered into a distribution agreement (the "Distribution
Agreement") (in a form approved by the Board of Trustees of the Trust in a
manner specified in such Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

WHEREAS, the Trust recognizes and agrees that (a) the Distributor may retain the
services of firms or individuals to act as dealers (the "Dealers") of the Shares
in connection with the offering of Shares, and (b) the Distributor may make
payments for such services to the Dealers out of the fee paid to the Distributor
hereunder, any deferred sales charges imposed by the Distributor in connection
with the repurchase of Shares, its profits or any other source available to it;
and

WHEREAS, the Trust recognizes and agrees that the Distributor may impose certain
deferred sales charges in connection with the repurchase of Shares by the Fund,
and the Distributor may retain (or receive from the Fund, as the case may be)
all such deferred sales charges; and

WHEREAS, the Board of Trustees of the Trust, in considering whether the Fund
should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class B
shareholders;

NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this Plan for
the Fund as a plan for distribution relating to the Shares in accordance with
Rule 12b-1, on the following terms and conditions:

1. As specified in the Distribution Agreement, the Distributor shall provide
facilities, personnel and a program with respect to the offering and sale of
Shares. Among other things, the Distributor shall be responsible for commissions
payable to Dealers, all expenses of printing (excluding typesetting) and
distributing prospectuses to prospective shareholders and providing such other
related services as are reasonably necessary in connection therewith.

2. The Distributor shall bear all distribution-related expenses to the extent
specified in the Distribution Agreement in providing the services described in
paragraph 1, including without limitation, the compensation of personnel
necessary to provide such services and all costs of travel, office expenses
(including rent and overhead), equipment, printing, delivery and mailing costs.

3. It is understood that the Distributor may impose certain deferred sales
charges in connection with the repurchase of Shares by the Fund and the
Distributor may retain (or receive from the Fund, as the case may be) all such
deferred sales charges. As additional consideration for all services performed
and expenses incurred in the performance of its obligations under the
Distribution Agreement, the Fund shall pay the Distributor a distribution fee
periodically at a rate of 0.75% per annum of the Fund's average daily net assets
attributable to the shares.

4. As partial consideration for the personal services and/or account maintenance
services performed by each Dealer in the performance of its obligations under
its dealer agreement with the Distributor, the Fund shall pay each Dealer a
service fee periodically at a rate not to exceed 0.25% per annum of the portion
of the average daily net assets of the Fund that is represented by Shares that
are owned by investors for whom such Dealer is the holder or dealer of record.
That portion of the Fund's average daily net assets on which the fees payable
under this paragraph 4 hereof are calculated may be subject to certain minimum
amount requirements as may be determined, and additional or different dealer
qualification standards that may be established from time to time, by the
Distributor. The Distributor shall be entitled to be paid any fees payable under
this paragraph 4 hereof with respect to Shares for which no Dealer of record
exists or qualification standards have not been met as partial consideration for
personal services and/or account maintenance services provided by the
Distributor to the Shares. The service fee payable pursuant to this paragraph 4
may from time to time be paid by the Fund to the Distributor and the Distributor
will then pay these fees on behalf of the Fund.

5. The Fund understands that agreements between the Distributor and the Dealers
may provide for payment of commissions to Dealers in connection with the sales
of Shares and may provide for a portion (which may be all or substantially all)
of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

6. The Fund shall pay all fees and expenses of any independent auditor, legal
counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

7. Nothing herein contained shall be deemed to require the Trust to take any
action contrary to its Declaration of Trust or By-Laws or any applicable
statutory or regulatory requirement to which it is subject or by which it is
bound, or to relieve or deprive the Board of Trustees of the responsibility for
and control of the conduct of the affairs of the Fund.

8. This Plan shall become effective upon (a) approval by a vote of at least a
"majority of the outstanding voting securities" of the Shares, and (b) approval
by a vote of the Board of Trustees and a vote of a majority of the Trustees who
are not "interested persons" of the Trust and who have no direct or indirect
financial interest in the operation of the Plan or in any agreement related to
the Plan (the "Qualified Trustees"), such votes to be cast in person at a
meeting called for the purpose of voting on this Plan.

9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

10. This Plan may be amended at any time by the Board of Trustees; provided that
this Plan may not be amended to increase materially the amount of permitted
expenses hereunder without the approval of holders of a "majority of the
outstanding voting securities" of the Shares and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of the Shares.

11. The Fund and the Distributor shall provide the Board of Trustees, and the
Board of Trustees shall review, at least quarterly, a written report of the
amounts expended under this Plan and the purposes for which such expenditures
were made.

12. While this Plan is in effect, the selection and nomination of Qualified
Trustees shall be committed to the discretion of the Trustees who are not
"interested persons" of the Trust.

13. For the purposes of this Plan, the terms "interested persons", "majority of
the outstanding voting securities" and "specifically approved at least annually"
are used as defined in the 1940 Act. In addition, for purposes of determining
the fees payable to the Distributor hereunder, the value of the Fund's net
assets shall be computed in the manner specified in the Fund's then current
prospectus and statement of additional information for computation of the net
asset value of the Shares of the Fund.

14. The Trust shall preserve copies of this Plan, and each agreement related
hereto and each report referred to in paragraph 11 hereof (collectively, the
"Records") for a period of six years from the end of the fiscal year in which
such Record was made and each such record shall be kept in an easily accessible
place for the first two years of said record-keeping.

15. This Plan shall be construed in accordance with the laws of The Commonwealth
of Massachusetts and the applicable provisions of the 1940 Act.

16. If any provision of this Plan shall be held or made invalid by a court
decision, statute, rule or otherwise, the remainder of the Plan shall not be
affected thereby.


                                                            EXHIBIT NO. 99.15(j)

                               MFS SERIES TRUST I

                             MFS EQUITY INCOME FUND

                              PLAN OF DISTRIBUTION

         PLAN OF DISTRIBUTION with respect to the shares of beneficial interest
to be designated "CLASS C" of MFS EQUITY INCOME FUND (the "Fund"), a series of
MFS Series Trust I (the "Trust") a Massachusetts business trust, dated this 2nd
day of January, 1996.

                                   WITNESSETH:

         WHEREAS, the Trust is engaged in business as an open-end management
investment company and is registered under the Investment Company Act of 1940,
as amended (collectively with the rules and regulations promulgated thereunder,
the "1940 Act"); and

         WHEREAS, the Trust intends to distribute the shares of beneficial
interest (without par value) of the Fund designated Class C Shares (the
"Shares") in accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and
desires to adopt this Distribution Plan (the "Plan") as a plan of distribution
pursuant to such Rule; and

         WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

         WHEREAS, the Trust has entered into a distribution agreement (the
"Distribution Agreement") (in a form approved by the Board of Trustees of the
Trust in a manner specified in Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

         WHEREAS, the Trust recognizes and agrees that (a) the Distributor may
retain the services of firms or individuals to act as dealers (the "Dealers") of
the Shares in connection with the offering of Shares, and (b) the Distributor
may make payments for such services to the Dealers out of the fee paid to the
Distributor hereunder, any deferred sales charges imposed by the Distributor in
connection with the repurchase of Shares, its profits or any other source
available to it; and

         WHEREAS, the Trust recognizes and agrees that the Distributor may (but
is not required to) impose certain deferred sales charges in connection with the
repurchase of Shares by the Fund, and the Distributor may retain (or receive
from the Fund, as the case may be) all such deferred sales charges; and

         WHEREAS, the Board of Trustees of the Trust, in considering whether the
Fund should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class C
shareholders;

         NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this
Plan for the Fund as a plan for distribution relating to the Shares in
accordance with Rule 12b-1, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
commissions payable to Dealers (including any ongoing maintenance commissions),
all expenses of printing (excluding typesetting) and distributing prospectuses
to prospective shareholders and providing such other related services as are
reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses to the
extent specified in the Distribution Agreement in providing the services
described in paragraph 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. It is understood that the Distributor may (but is not required to)
impose certain deferred sales charges in connection with the repurchase of
Shares by the Fund and the Distributor may retain (or receive from the Fund, as
the case may be) all such deferred sales charges. As additional consideration
for all services performed and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.75% per annum of the
Fund's average daily net assets attributable to the Shares.

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its dealer agreement with the Distributor, the Fund shall pay
each Dealer a service fee periodically at a rate not to exceed 0.25% per annum
of the portion of the average daily net assets of the Fund that is represented
by Shares that are owned by investors for whom such Dealer is the holder or
dealer of record. That portion of the Fund's average daily net assets on which
the fees payable under this paragraph 4 hereof are calculated may be subject to
certain minimum amount requirements as may be determined, and additional or
different dealer qualification standards that may be established, from time to
time by the Distributor. The Distributor shall be entitled to be paid any fees
payable under this paragraph 4 hereof with respect to Shares for which no Dealer
of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The service fee payable pursuant to this
paragraph 4 may from time to time be paid by the Fund to the Distributor and the
Distributor will then pay these fees to Dealers on behalf of the Fund or retain
them in accordance with this paragraph.

         5. The Fund understands that agreements between the Distributor and the
Dealers may provide for payment of commissions to Dealers in connection with the
sales of Shares and may provide for a portion (which may be all or substantially
all) of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

         6. The Fund shall pay all fees and expenses of any independent auditor,
legal counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

         7. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         8. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of Class C, and (b)
approval by a vote of the Board of Trustees and a vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any agreement
related to the Plan (the "Qualified Trustees"), such votes to be cast in person
at a meeting called for the purpose of voting on this Plan.

         9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

         10. This Plan may be amended at any time by the Board of Trustees;
provided that this Plan may not be amended to increase materially the amount of
permitted expenses hereunder without the approval of holders of a "majority of
the outstanding voting securities" of Class C and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of Class C.

         11. The Fund and the Distributor shall provide the Board of Trustees,
and the Board of Trustees shall review, at least quarterly, a written report of
the amounts expended under this Plan and the purposes for which such
expenditures were made.

         12. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         13. For the purposes of this Plan, the terms "interested persons",
"majority of the outstanding voting securities" and "specifically approved at
least annually" are used as defined in the 1940 Act. In addition, for purposes
of determining the fees payable to the Distributor hereunder, the value of the
Fund's net assets shall be computed in the manner specified in the Fund's
then-current prospectus and statement of additional information for computation
of the net asset value of the Shares of the Fund.

         14. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in paragraph 11 hereof (collectively,
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such record shall be kept in an easily
accessible place for the first two years of said record-keeping.

         15. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         16. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                       MFS RESEARCH GROWTH AND INCOME FUND

                              PLAN OF DISTRIBUTION

         PLAN OF DISTRIBUTION with respect to the shares of beneficial interest
to be designated "CLASS C" of MFS RESEARCH GROWTH AND INCOME FUND (the "Fund"),
a series of MFS Series Trust I (the "Trust") a Massachusetts business trust,
dated this 2nd day of January, 1996.

                                   WITNESSETH:

         WHEREAS, the Trust is engaged in business as an open-end management
investment company and is registered under the Investment Company Act of 1940,
as amended (collectively with the rules and regulations promulgated thereunder,
the "1940 Act"); and

         WHEREAS, the Trust intends to distribute the shares of beneficial
interest (without par value) of the Fund designated Class C Shares (the
"Shares") in accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and
desires to adopt this Distribution Plan (the "Plan") as a plan of distribution
pursuant to such Rule; and

         WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

         WHEREAS, the Trust has entered into a distribution agreement (the
"Distribution Agreement") (in a form approved by the Board of Trustees of the
Trust in a manner specified in Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

         WHEREAS, the Trust recognizes and agrees that (a) the Distributor may
retain the services of firms or individuals to act as dealers (the "Dealers") of
the Shares in connection with the offering of Shares, and (b) the Distributor
may make payments for such services to the Dealers out of the fee paid to the
Distributor hereunder, any deferred sales charges imposed by the Distributor in
connection with the repurchase of Shares, its profits or any other source
available to it; and

         WHEREAS, the Trust recognizes and agrees that the Distributor may (but
is not required to) impose certain deferred sales charges in connection with the
repurchase of Shares by the Fund, and the Distributor may retain (or receive
from the Fund, as the case may be) all such deferred sales charges; and

         WHEREAS, the Board of Trustees of the Trust, in considering whether the
Fund should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class C
shareholders;

         NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this
Plan for the Fund as a plan for distribution relating to the Shares in
accordance with Rule 12b-1, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
commissions payable to Dealers (including any ongoing maintenance commissions),
all expenses of printing (excluding typesetting) and distributing prospectuses
to prospective shareholders and providing such other related services as are
reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses to the
extent specified in the Distribution Agreement in providing the services
described in paragraph 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. It is understood that the Distributor may (but is not required to)
impose certain deferred sales charges in connection with the repurchase of
Shares by the Fund and the Distributor may retain (or receive from the Fund, as
the case may be) all such deferred sales charges. As additional consideration
for all services performed and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.75% per annum of the
Fund's average daily net assets attributable to the Shares.

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its dealer agreement with the Distributor, the Fund shall pay
each Dealer a service fee periodically at a rate not to exceed 0.25% per annum
of the portion of the average daily net assets of the Fund that is represented
by Shares that are owned by investors for whom such Dealer is the holder or
dealer of record. That portion of the Fund's average daily net assets on which
the fees payable under this paragraph 4 hereof are calculated may be subject to
certain minimum amount requirements as may be determined, and additional or
different dealer qualification standards that may be established, from time to
time by the Distributor. The Distributor shall be entitled to be paid any fees
payable under this paragraph 4 hereof with respect to Shares for which no Dealer
of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The service fee payable pursuant to this
paragraph 4 may from time to time be paid by the Fund to the Distributor and the
Distributor will then pay these fees to Dealers on behalf of the Fund or retain
them in accordance with this paragraph.

         5. The Fund understands that agreements between the Distributor and the
Dealers may provide for payment of commissions to Dealers in connection with the
sales of Shares and may provide for a portion (which may be all or substantially
all) of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

         6. The Fund shall pay all fees and expenses of any independent auditor,
legal counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

         7. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         8. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of Class C, and (b)
approval by a vote of the Board of Trustees and a vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any agreement
related to the Plan (the "Qualified Trustees"), such votes to be cast in person
at a meeting called for the purpose of voting on this Plan.

         9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

         10. This Plan may be amended at any time by the Board of Trustees;
provided that this Plan may not be amended to increase materially the amount of
permitted expenses hereunder without the approval of holders of a "majority of
the outstanding voting securities" of Class C and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of Class C.

         11. The Fund and the Distributor shall provide the Board of Trustees,
and the Board of Trustees shall review, at least quarterly, a written report of
the amounts expended under this Plan and the purposes for which such
expenditures were made.

         12. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         13. For the purposes of this Plan, the terms "interested persons",
"majority of the outstanding voting securities" and "specifically approved at
least annually" are used as defined in the 1940 Act. In addition, for purposes
of determining the fees payable to the Distributor hereunder, the value of the
Fund's net assets shall be computed in the manner specified in the Fund's
then-current prospectus and statement of additional information for computation
of the net asset value of the Shares of the Fund.

         14. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in paragraph 11 hereof (collectively,
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such record shall be kept in an easily
accessible place for the first two years of said record-keeping.

         15. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         16. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                              MFS CORE GROWTH FUND

                              PLAN OF DISTRIBUTION

         PLAN OF DISTRIBUTION with respect to the shares of beneficial interest
to be designated "CLASS C" of MFS CORE GROWTH FUND (the "Fund"), a series of MFS
Series Trust I (the "Trust") a Massachusetts business trust, dated this 2nd day
of January, 1996.

                                   WITNESSETH:

         WHEREAS, the Trust is engaged in business as an open-end management
investment company and is registered under the Investment Company Act of 1940,
as amended (collectively with the rules and regulations promulgated thereunder,
the "1940 Act"); and

         WHEREAS, the Trust intends to distribute the shares of beneficial
interest (without par value) of the Fund designated Class C Shares (the
"Shares") in accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and
desires to adopt this Distribution Plan (the "Plan") as a plan of distribution
pursuant to such Rule; and

         WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

         WHEREAS, the Trust has entered into a distribution agreement (the
"Distribution Agreement") (in a form approved by the Board of Trustees of the
Trust in a manner specified in Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

         WHEREAS, the Trust recognizes and agrees that (a) the Distributor may
retain the services of firms or individuals to act as dealers (the "Dealers") of
the Shares in connection with the offering of Shares, and (b) the Distributor
may make payments for such services to the Dealers out of the fee paid to the
Distributor hereunder, any deferred sales charges imposed by the Distributor in
connection with the repurchase of Shares, its profits or any other source
available to it; and

         WHEREAS, the Trust recognizes and agrees that the Distributor may (but
is not required to) impose certain deferred sales charges in connection with the
repurchase of Shares by the Fund, and the Distributor may retain (or receive
from the Fund, as the case may be) all such deferred sales charges; and

         WHEREAS, the Board of Trustees of the Trust, in considering whether the
Fund should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class C
shareholders;

         NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this
Plan for the Fund as a plan for distribution relating to the Shares in
accordance with Rule 12b-1, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
commissions payable to Dealers (including any ongoing maintenance commissions),
all expenses of printing (excluding typesetting) and distributing prospectuses
to prospective shareholders and providing such other related services as are
reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses to the
extent specified in the Distribution Agreement in providing the services
described in paragraph 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. It is understood that the Distributor may (but is not required to)
impose certain deferred sales charges in connection with the repurchase of
Shares by the Fund and the Distributor may retain (or receive from the Fund, as
the case may be) all such deferred sales charges. As additional consideration
for all services performed and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.75% per annum of the
Fund's average daily net assets attributable to the Shares.

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its dealer agreement with the Distributor, the Fund shall pay
each Dealer a service fee periodically at a rate not to exceed 0.25% per annum
of the portion of the average daily net assets of the Fund that is represented
by Shares that are owned by investors for whom such Dealer is the holder or
dealer of record. That portion of the Fund's average daily net assets on which
the fees payable under this paragraph 4 hereof are calculated may be subject to
certain minimum amount requirements as may be determined, and additional or
different dealer qualification standards that may be established, from time to
time by the Distributor. The Distributor shall be entitled to be paid any fees
payable under this paragraph 4 hereof with respect to Shares for which no Dealer
of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The service fee payable pursuant to this
paragraph 4 may from time to time be paid by the Fund to the Distributor and the
Distributor will then pay these fees to Dealers on behalf of the Fund or retain
them in accordance with this paragraph.

         5. The Fund understands that agreements between the Distributor and the
Dealers may provide for payment of commissions to Dealers in connection with the
sales of Shares and may provide for a portion (which may be all or substantially
all) of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

         6. The Fund shall pay all fees and expenses of any independent auditor,
legal counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

         7. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         8. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of Class C, and (b)
approval by a vote of the Board of Trustees and a vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any agreement
related to the Plan (the "Qualified Trustees"), such votes to be cast in person
at a meeting called for the purpose of voting on this Plan.

         9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

         10. This Plan may be amended at any time by the Board of Trustees;
provided that this Plan may not be amended to increase materially the amount of
permitted expenses hereunder without the approval of holders of a "majority of
the outstanding voting securities" of Class C and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of Class C.

         11. The Fund and the Distributor shall provide the Board of Trustees,
and the Board of Trustees shall review, at least quarterly, a written report of
the amounts expended under this Plan and the purposes for which such
expenditures were made.

         12. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         13. For the purposes of this Plan, the terms "interested persons",
"majority of the outstanding voting securities" and "specifically approved at
least annually" are used as defined in the 1940 Act. In addition, for purposes
of determining the fees payable to the Distributor hereunder, the value of the
Fund's net assets shall be computed in the manner specified in the Fund's
then-current prospectus and statement of additional information for computation
of the net asset value of the Shares of the Fund.

         14. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in paragraph 11 hereof (collectively,
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such record shall be kept in an easily
accessible place for the first two years of said record-keeping.

         15. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         16. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                           MFS AGGRESSIVE GROWTH FUND

                              PLAN OF DISTRIBUTION

         PLAN OF DISTRIBUTION with respect to the shares of beneficial interest
to be designated "CLASS C" of MFS AGGRESSIVE GROWTH FUND (the "Fund"), a series
of MFS Series Trust I (the "Trust") a Massachusetts business trust, dated this
2nd day of January, 1996.

                                   WITNESSETH:

         WHEREAS, the Trust is engaged in business as an open-end management
investment company and is registered under the Investment Company Act of 1940,
as amended (collectively with the rules and regulations promulgated thereunder,
the "1940 Act"); and

         WHEREAS, the Trust intends to distribute the shares of beneficial
interest (without par value) of the Fund designated Class C Shares (the
"Shares") in accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and
desires to adopt this Distribution Plan (the "Plan") as a plan of distribution
pursuant to such Rule; and

         WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

         WHEREAS, the Trust has entered into a distribution agreement (the
"Distribution Agreement") (in a form approved by the Board of Trustees of the
Trust in a manner specified in Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

         WHEREAS, the Trust recognizes and agrees that (a) the Distributor may
retain the services of firms or individuals to act as dealers (the "Dealers") of
the Shares in connection with the offering of Shares, and (b) the Distributor
may make payments for such services to the Dealers out of the fee paid to the
Distributor hereunder, any deferred sales charges imposed by the Distributor in
connection with the repurchase of Shares, its profits or any other source
available to it; and

         WHEREAS, the Trust recognizes and agrees that the Distributor may (but
is not required to) impose certain deferred sales charges in connection with the
repurchase of Shares by the Fund, and the Distributor may retain (or receive
from the Fund, as the case may be) all such deferred sales charges; and

         WHEREAS, the Board of Trustees of the Trust, in considering whether the
Fund should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class C
shareholders;

         NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this
Plan for the Fund as a plan for distribution relating to the Shares in
accordance with Rule 12b-1, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
commissions payable to Dealers (including any ongoing maintenance commissions),
all expenses of printing (excluding typesetting) and distributing prospectuses
to prospective shareholders and providing such other related services as are
reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses to the
extent specified in the Distribution Agreement in providing the services
described in paragraph 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. It is understood that the Distributor may (but is not required to)
impose certain deferred sales charges in connection with the repurchase of
Shares by the Fund and the Distributor may retain (or receive from the Fund, as
the case may be) all such deferred sales charges. As additional consideration
for all services performed and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.75% per annum of the
Fund's average daily net assets attributable to the Shares.

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its dealer agreement with the Distributor, the Fund shall pay
each Dealer a service fee periodically at a rate not to exceed 0.25% per annum
of the portion of the average daily net assets of the Fund that is represented
by Shares that are owned by investors for whom such Dealer is the holder or
dealer of record. That portion of the Fund's average daily net assets on which
the fees payable under this paragraph 4 hereof are calculated may be subject to
certain minimum amount requirements as may be determined, and additional or
different dealer qualification standards that may be established, from time to
time by the Distributor. The Distributor shall be entitled to be paid any fees
payable under this paragraph 4 hereof with respect to Shares for which no Dealer
of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The service fee payable pursuant to this
paragraph 4 may from time to time be paid by the Fund to the Distributor and the
Distributor will then pay these fees to Dealers on behalf of the Fund or retain
them in accordance with this paragraph.

         5. The Fund understands that agreements between the Distributor and the
Dealers may provide for payment of commissions to Dealers in connection with the
sales of Shares and may provide for a portion (which may be all or substantially
all) of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

         6. The Fund shall pay all fees and expenses of any independent auditor,
legal counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

         7. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         8. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of Class C, and (b)
approval by a vote of the Board of Trustees and a vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any agreement
related to the Plan (the "Qualified Trustees"), such votes to be cast in person
at a meeting called for the purpose of voting on this Plan.

         9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

         10. This Plan may be amended at any time by the Board of Trustees;
provided that this Plan may not be amended to increase materially the amount of
permitted expenses hereunder without the approval of holders of a "majority of
the outstanding voting securities" of Class C and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of Class C.

         11. The Fund and the Distributor shall provide the Board of Trustees,
and the Board of Trustees shall review, at least quarterly, a written report of
the amounts expended under this Plan and the purposes for which such
expenditures were made.

         12. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         13. For the purposes of this Plan, the terms "interested persons",
"majority of the outstanding voting securities" and "specifically approved at
least annually" are used as defined in the 1940 Act. In addition, for purposes
of determining the fees payable to the Distributor hereunder, the value of the
Fund's net assets shall be computed in the manner specified in the Fund's
then-current prospectus and statement of additional information for computation
of the net asset value of the Shares of the Fund.

         14. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in paragraph 11 hereof (collectively,
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such record shall be kept in an easily
accessible place for the first two years of said record-keeping.

         15. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         16. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


<PAGE>


                               MFS SERIES TRUST I

                         MFS SPECIAL OPPORTUNITIES FUND

                              PLAN OF DISTRIBUTION

         PLAN OF DISTRIBUTION with respect to the shares of beneficial interest
to be designated "CLASS C" of MFS SPECIAL OPPORTUNITIES FUND (the "Fund"), a
series of MFS Series Trust I (the "Trust") a Massachusetts business trust, dated
this 2nd day of January, 1996.

                                   WITNESSETH:

         WHEREAS, the Trust is engaged in business as an open-end management
investment company and is registered under the Investment Company Act of 1940,
as amended (collectively with the rules and regulations promulgated thereunder,
the "1940 Act"); and

         WHEREAS, the Trust intends to distribute the shares of beneficial
interest (without par value) of the Fund designated Class C Shares (the
"Shares") in accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and
desires to adopt this Distribution Plan (the "Plan") as a plan of distribution
pursuant to such Rule; and

         WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

         WHEREAS, the Trust has entered into a distribution agreement (the
"Distribution Agreement") (in a form approved by the Board of Trustees of the
Trust in a manner specified in Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares; and

         WHEREAS, the Trust recognizes and agrees that (a) the Distributor may
retain the services of firms or individuals to act as dealers (the "Dealers") of
the Shares in connection with the offering of Shares, and (b) the Distributor
may make payments for such services to the Dealers out of the fee paid to the
Distributor hereunder, any deferred sales charges imposed by the Distributor in
connection with the repurchase of Shares, its profits or any other source
available to it; and

         WHEREAS, the Trust recognizes and agrees that the Distributor may (but
is not required to) impose certain deferred sales charges in connection with the
repurchase of Shares by the Fund, and the Distributor may retain (or receive
from the Fund, as the case may be) all such deferred sales charges; and

         WHEREAS, the Board of Trustees of the Trust, in considering whether the
Fund should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class C
shareholders;

         NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this
Plan for the Fund as a plan for distribution relating to the Shares in
accordance with Rule 12b-1, on the following terms and conditions:

         1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
commissions payable to Dealers (including any ongoing maintenance commissions),
all expenses of printing (excluding typesetting) and distributing prospectuses
to prospective shareholders and providing such other related services as are
reasonably necessary in connection therewith.

         2. The Distributor shall bear all distribution-related expenses to the
extent specified in the Distribution Agreement in providing the services
described in paragraph 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

         3. It is understood that the Distributor may (but is not required to)
impose certain deferred sales charges in connection with the repurchase of
Shares by the Fund and the Distributor may retain (or receive from the Fund, as
the case may be) all such deferred sales charges. As additional consideration
for all services performed and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.75% per annum of the
Fund's average daily net assets attributable to the Shares.

         4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its dealer agreement with the Distributor, the Fund shall pay
each Dealer a service fee periodically at a rate not to exceed 0.25% per annum
of the portion of the average daily net assets of the Fund that is represented
by Shares that are owned by investors for whom such Dealer is the holder or
dealer of record. That portion of the Fund's average daily net assets on which
the fees payable under this paragraph 4 hereof are calculated may be subject to
certain minimum amount requirements as may be determined, and additional or
different dealer qualification standards that may be established, from time to
time by the Distributor. The Distributor shall be entitled to be paid any fees
payable under this paragraph 4 hereof with respect to Shares for which no Dealer
of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The service fee payable pursuant to this
paragraph 4 may from time to time be paid by the Fund to the Distributor and the
Distributor will then pay these fees to Dealers on behalf of the Fund or retain
them in accordance with this paragraph.

         5. The Fund understands that agreements between the Distributor and the
Dealers may provide for payment of commissions to Dealers in connection with the
sales of Shares and may provide for a portion (which may be all or substantially
all) of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

         6. The Fund shall pay all fees and expenses of any independent auditor,
legal counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

         7. Nothing herein contained shall be deemed to require the Trust to
take any action contrary to its Declaration of Trust or By-Laws or any
applicable statutory or regulatory requirement to which it is subject or by
which it is bound, or to relieve or deprive the Board of Trustees of the
responsibility for and control of the conduct of the affairs of the Fund.

         8. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of Class C, and (b)
approval by a vote of the Board of Trustees and a vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any agreement
related to the Plan (the "Qualified Trustees"), such votes to be cast in person
at a meeting called for the purpose of voting on this Plan.

         9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.

         10. This Plan may be amended at any time by the Board of Trustees;
provided that this Plan may not be amended to increase materially the amount of
permitted expenses hereunder without the approval of holders of a "majority of
the outstanding voting securities" of Class C and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of Class C.

         11. The Fund and the Distributor shall provide the Board of Trustees,
and the Board of Trustees shall review, at least quarterly, a written report of
the amounts expended under this Plan and the purposes for which such
expenditures were made.

         12. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

         13. For the purposes of this Plan, the terms "interested persons",
"majority of the outstanding voting securities" and "specifically approved at
least annually" are used as defined in the 1940 Act. In addition, for purposes
of determining the fees payable to the Distributor hereunder, the value of the
Fund's net assets shall be computed in the manner specified in the Fund's
then-current prospectus and statement of additional information for computation
of the net asset value of the Shares of the Fund.

         14. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in paragraph 11 hereof (collectively,
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such record shall be kept in an easily
accessible place for the first two years of said record-keeping.

         15. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

         16. If any provision of this Plan shall be held or made invalid by a
court decision, statute, rule or otherwise, the remainder of the Plan shall not
be affected thereby.


                                                            EXHIBIT NO. 99.15(k)

                               MFS SERIES TRUST I

                              MFS CASH RESERVE FUND

                              PLAN OF DISTRIBUTION

PLAN OF DISTRIBUTION with respect to the shares of beneficial interest to be
designated "CLASS C" of MFS CASH RESERVE FUND (the "Fund"), a series of MFS
Series Trust I, a Massachusetts business trust, dated February 14, 1996.

                                   WITNESSETH:

      WHEREAS, the Trust is engaged in business as an open-end management
investment company and is registered under the Investment Company Act of 1940,
as amended (collectively with the rules and regulations promulgated thereunder,
the "1940 Act"); and

      WHEREAS, the Trust intends to distribute the shares of beneficial interest
(without par value) of the Fund designated Class C Shares (the "Shares") in
accordance with Rule 12b-1 under the 1940 Act ("Rule 12b-1"), and desires to
adopt this Distribution Plan (the "Plan") as a plan of distribution pursuant to
such Rule; and

      WHEREAS, the Trust desires for MFS Fund Distributors, Inc., a Delaware
corporation, to provide certain distribution services for the Fund (the
"Distributor"); and

      WHEREAS, the Trust has entered into a distribution agreement (the
"Distribution Agreement") (in a form approved by the Board of Trustees of the
Trust in a manner specified in Rule 12b-1) with the Distributor, whereby the
Distributor will provide facilities and personnel and render services to the
Fund in connection with the offering and distribution of the Shares (the
"Distribution Agreement"); and

      WHEREAS, the Trust recognizes and agrees that (a) the Distributor may
retain the services of firms or individuals to act as dealers (the "Dealers") of
the Shares in connection with the offering of Shares, and (b) the Distributor
may make payments for such services to the Dealers out of the fee paid to the
Distributor hereunder, any deferred sales charges imposed by the Distributor in
connection with the repurchase of Shares, its profits or any other source
available to it; and

      WHEREAS, the Trust recognizes and agrees that the Distributor may (but is
not required to) impose certain deferred sales charges in connection with the
repurchase of Shares by the Fund, and the Distributor may retain (or receive
from the Fund as the case may be) all such deferred sales charges; and

      WHEREAS, the Board of Trustees of the Trust, in considering whether the
Fund should adopt and implement this Plan, has evaluated such information as it
deemed necessary to an informed determination as to whether this Plan should be
adopted and implemented and has considered such pertinent factors as it deemed
necessary to form the basis for a decision to use assets of the Fund for such
purposes, and has determined that there is a reasonable likelihood that the
adoption and implementation of this Plan will benefit the Fund and its Class C
shareholders;

      NOW, THEREFORE, the Board of Trustees of the Trust hereby adopts this Plan
for the Fund as a plan for distribution relating to the Shares in accordance
with Rule 12b-1, on the following terms and conditions:

      1. As specified in the Distribution Agreement, the Distributor shall
provide facilities, personnel and a program with respect to the offering and
sale of Shares. Among other things, the Distributor shall be responsible for any
commissions payable to Dealers (including any ongoing maintenance commissions),
all expenses of printing (excluding typesetting) and distributing prospectuses
to prospective shareholders and providing such other related services as are
reasonably necessary in connection therewith.

      2. The Distributor shall bear all distribution-related expenses to the
extent specified in the Distribution Agreement in providing the services
described in paragraph 1, including without limitation, the compensation of
personnel necessary to provide such services and all costs of travel, office
expenses (including rent and overhead), equipment, printing, delivery and
mailing costs.

      3. It is understood that the Distributor may (but is not required to)
impose certain deferred sales charges in connection with the repurchase of
Shares by the Fund and the Distributor may retain (or receive from the Fund, as
the case may be) all such deferred sales charges. As additional consideration
for all services performed and expenses incurred in the performance of its
obligations under the Distribution Agreement, the Fund shall pay the Distributor
a distribution fee periodically at a rate not to exceed 0.75% per annum of the
Fund's average daily net assets attributable to the Shares.

      4. As partial consideration for the personal services and/or account
maintenance services performed by each Dealer in the performance of its
obligations under its dealer agreement with the Distributor, the Fund shall pay
each Dealer a service fee periodically at a rate not to exceed 0.25% per annum
of the portion of the average daily net assets of the Fund that is represented
by Shares that are owned by investors for whom such Dealer is the holder or
dealer of record. That portion of the Fund's average daily net assets on which
the fees payable under this paragraph 4 hereof are calculated may be subject to
certain minimum amount requirements as may be determined, and additional or
different dealer qualification standards that may be established, from time to
time by the Distributor. The Distributor shall be entitled to be paid any fees
payable under this paragraph 4 hereof with respect to Shares for which no Dealer
of record exists or qualification standards have not been met as partial
consideration for personal services and/or account maintenance services provided
by the Distributor to the Shares. The service fee payable pursuant to this
paragraph 4 may from time to time be paid by the Fund to the Distributor and the
Distributor will then pay these fees to Dealers on behalf of the Fund or retain
them in accordance with this paragraph.

      5. The Fund understands that agreements between the Distributor and the
Dealers may provide for payment of commissions to Dealers in connection with the
sales of Shares and may provide for a portion (which may be all or substantially
all) of the fees payable by the Fund to the Distributor under the Distribution
Agreement to be paid by the Distributor to the Dealers in consideration of the
Dealer's services as a dealer of the Shares. Except as described in paragraph 4,
nothing in this Plan shall be construed as requiring the Fund to make any
payment to any Dealer or to have any obligations to any Dealer in connection
with services as a dealer of the Shares. The Distributor shall agree and
undertake that any agreement entered into between the Distributor and any Dealer
shall provide that, except as provided in paragraph 4, such Dealer shall look
solely to the Distributor for compensation for its services thereunder and that
in no event shall such Dealer seek any payment from the Fund.

      6. The Fund shall pay all fees and expenses of any independent auditor,
legal counsel, investment adviser, administrator, transfer agent, custodian,
shareholder servicing agent, registrar or dividend disbursing agent of the Fund;
expenses of distributing and redeeming Shares and servicing shareholder
accounts; expenses of preparing, printing and mailing prospectuses, shareholder
reports, notices, proxy statements and reports to governmental officers and
commissions and to shareholders of the Fund, except that the Distributor shall
be responsible for the distribution-related expenses as provided in paragraphs 1
and 2 hereof.

      7. Nothing herein contained shall be deemed to require the Trust to take
any action contrary to its Declaration of Trust or By-Laws or any applicable
statutory or regulatory requirement to which it is subject or by which it is
bound, or to relieve or deprive the Board of Trustees of the responsibility for
and control of the conduct of the affairs of the Fund.

      8. This Plan shall become effective upon (a) approval by a vote of at
least a "majority of the outstanding voting securities" of Class C, and (b)
approval by a vote of the Board of Trustees and a vote of a majority of the
Trustees who are not "interested persons" of the Trust and who have no direct or
indirect financial interest in the operation of the Plan or in any agreement
related to the Plan (the "Qualified Trustees"), such votes to be cast in person
at a meeting called for the purpose of voting on this Plan.

      9. This Plan shall continue in effect indefinitely; provided that such
continuance is "specifically approved at least annually" by a vote of both a
majority of the Trustees of the Trust and a majority of the Qualified Trustees.
If such annual approval is not obtained, this Plan shall expire 12 months after
the effective date of the last approval.

      10. This Plan may be amended at any time by the Board of Trustees;
provided that this Plan may not be amended to increase materially the amount of
permitted expenses hereunder without the approval of holders of a "majority of
the outstanding voting securities" of Class C and may not be materially amended
in any case without a vote of a majority of both the Trustees and the Qualified
Trustees. This Plan may be terminated at any time by a vote of a majority of the
Qualified Trustees or by a vote of the holders of a "majority of the outstanding
voting securities" of Class C.

      11. The Fund and the Distributor shall provide the Board of Trustees, and
the Board of Trustees shall review, at least quarterly, a written report of the
amounts expended under this Plan and the purposes for which such expenditures
were made.

      12. While this Plan is in effect, the selection and nomination of
Qualified Trustees shall be committed to the discretion of the Trustees who are
not "interested persons" of the Trust.

      13. For the purposes of this Plan, the terms "interested persons",
"majority of the outstanding voting securities" and "specifically approved at
least annually" are used as defined in the 1940 Act. In addition, for purposes
of determining the fees payable to the Distributor hereunder, the value of the
Fund's net assets shall be computed in the manner specified in the Fund's
then-current prospectus and statement of additional information for computation
of the net asset value of the Shares of the Fund.

      14. The Trust shall preserve copies of this Plan, and each agreement
related hereto and each report referred to in paragraph 11 hereof (collectively,
the "Records") for a period of six years from the end of the fiscal year in
which such Record was made and each such record shall be kept in an easily
accessible place for the first two years of said record-keeping.

         15. This Plan shall be construed in accordance with the laws of The
Commonwealth of Massachusetts and the applicable provisions of the 1940 Act.

      16. If any provision of this Plan shall be held or made invalid by a court
decision, statute, rule or otherwise, the remainder of the Plan shall not be
affected thereby.



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