MFS MUNICIPAL SERIES TRUST
485BPOS, 1996-08-29
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<PAGE>
   
    As filed with the Securities and Exchange Commission on August 29, 1996
    
                                            1933 Act File No. 2-92915
                                            1940 Act File No. 811-4096

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                               -----------------
                                    FORM N-1A
            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
   
                         POST-EFFECTIVE AMENDMENT NO.30
    
      AND REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940
   
                                AMENDMENT NO. 31
    
                           MFS MUNICIPAL SERIES TRUST
               (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 August 31, 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 on behalf of all of its series
for its fiscal year ended March 31, 1996 on May 28, 1996.
    
<PAGE>
                                    PART C


Item 24. Financial Statements and Exhibits
   
         (a)      *Financial Statements included in Part A:
    
                  MFS Municipal Series Trust (all series)

                           *Financial Highlights for a share of beneficial
                           interest of:

                           each  of  the  California,  Maryland,  Massachusetts,
                           North  Carolina,  South  Carolina,  Virginia and West
                           Virginia   Funds   of  the   Registrant   outstanding
                           throughout the ten-year period ending March 31, 1996;

                           each of the Georgia and New York Funds throughout the
                           period   from   the    commencement   of   investment
                           operations, June 6, 1988, to March 31, 1996;

                           the  Tennessee  Fund  throughout  the period from the
                           commencement  of  investment  operations,  August 12,
                           1988, to March 31, 1996;

                           the  Alabama  Fund  throughout  the  period  from the
                           commencement  of investment  operations,  February 1,
                           1990, to March 31, 1996;

                           each of the Arkansas and Florida Funds throughout the
                           period   from   the    commencement   of   investment
                           operations, February 3, 1992, to March 31, 1996;

                           the  Mississippi  Fund throughout the period from the
                           commencement  of  investment  operations,  August  6,
                           1992, to March 31, 1996;

                           the Pennsylvania  Fund throughout the period from the
                           commencement  of investment  operations,  February 1,
                           1993, to March 31, 1996;

                           the MFS Municipal Income Fund outstanding  throughout
                           the  period  from  the   commencement  of  investment
                           operations, December 29, 1986, to March
                           31, 1996.

                  Financial Statements included in Part B:

                  MFS Municipal Series Trust (all series)

                           At March 31, 1996:
                                    Portfolio of Investments*
                                    Statement of Assets and Liabilities*

                           For the two years ended March 31, 1996:
                                    Statement of Changes in Net Assets*
<PAGE>
                           For the year ended March 31, 1996:
                                    Statement of Operations*
- ----------------------------
* Incorporated  herein by reference to the Funds' Annual Reports to Shareholders
dated  March  31,  1996  which  were  filed  with the  Securities  and  Exchange
Commission ("SEC") via EDGAR on June 6, 1996.

         (b)      Exhibits

                   1                Amended and Restated Declaration of
                                    Trust, dated February 3, 1995.  (1)

                   2                Amended and Restated By-Laws, dated
                                    December 14, 1994. (1)

                   3                Not Applicable.

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

                   5       (a)      Investment Advisory Agreement, dated
                                    August 24, 1984 for all series other than
                                    Arkansas, California, Florida, Louisiana*,
                                    Mississippi, Pennsylvania, Texas*,
                                    Washington*, and MFS Municipal Income
                                    Fund.  (4)

                           (b)      Investment Advisory Agreement, dated
                                    February 1, 1992, for the MFS Arkansas
                                    Municipal Bond Fund.  (4)

                           (c)      Investment Advisory Agreement, dated
                                    February 1, 1992, for the MFS Florida
                                    Municipal Bond Fund.  (4)

                           (d)      Investment Advisory Agreement, dated
                                    February 1, 1992, for the MFS Texas
                                    Municipal Bond Fund*.  (4)

                           (e)      Investment Advisory Agreement, dated
                                    August 1, 1992, for the MFS Mississippi
                                    Municipal Bond Fund.  (4)

                           (f)      Investment Advisory Agreement, dated
                                    August 1, 1992, for the MFS Washington
                                    Municipal Bond Fund*.  (4)

                           (g)      Investment Advisory Agreement, dated
                                    February 1, 1993, for MFS Louisiana
                                    Municipal Bond Fund*.  (4)

                           (h)      Investment Advisory Agreement, dated
                                    February 1, 1993, for MFS Pennsylvania
                                    Municipal Bond Fund.  (4)

                           (i)      Investment Advisory Agreement, dated
                                    September 1, 1993, for MFS California
                                    Municipal Bond Fund.  (4)

*No longer in existence
<PAGE>
                           (j)      Investment Advisory Agreement, dated
                                    September 1, 1993, for the MFS Municipal
                                    Income Fund.  (4)

                   6       (a)      Amended and Restated Distribution
                                    Agreement for the MFS Municipal Series
                                    Trust, dated January 1, 1995.  (1)

                           (b)      Form of Dealer Agreement between MFS
                                    Financial Services, Inc. and a dealer, dated
                                    December 28, 1994, and form of Mutual
                                    Fund Agreement between MFS Financial
                                    Services, Inc. and a bank or NASD affiliate,
                                    dated December 28, 1994.  (1)

                   7                Retirement Plan for Non-Interested Person
                                    Trustees, dated January 1, 1991.  (4)

                   8       (a)      Custodian Agreement, dated June 15, 1988.
                                    (4)

                           (b)      Amendment to Custodian Agreement, dated
                                    June 15, 1988.  (4)

                           (c)      Amendment to Custodian Agreement, dated
                                    August 9, 1989.  (4)

                           (d)      Amendment to Custodian Agreement, dated
                                    October 1, 1989.  (4)

                           (e)      Amendment No. 3 to the Custodian
                                    Agreement, dated October 9, 1991.  (4)

                   9       (a)      Shareholder Servicing Agent Agreement,
                                    dated August 1, 1985.  (4)

                           (b)      Amendment to Shareholder Servicing
                                    Agreement, dated December 28, 1993.  (2)

                           (c)      Exchange Privilege Agreement, dated
                                    September 1, 1993.  (4)

                           (d)      Loan  Agreement by and among The Banks Named
                                    Therein,  The MFS Funds Named  Therein,  and
                                    The First  National Bank of Boston as Agent,
                                    dated February 21, 1995.
                                    (3)

                           (e)      Dividend Disbursing Agency Agreement,
                                    dated February 1, 1986.  (4)
   
                  10                24e-2 Opinion of Counsel.  (5)

                  11                Not Applicable.
    
                  12                Not Applicable.

                  13                Investment Representation Letter.  (4)

                  14                Not Applicable.

                  15       (a)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Alabama
                                    Municipal Bond Fund.  (4)
<PAGE>
                           (b)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Arkansas
                                    Municipal Bond Fund.  (4)

                           (c)      Distribution Plan for Class A shares, Plan
                                    of Distribution for Class B shares and Plan
                                    of Distribution for Class C shares for MFS
                                    California Municipal Bond Fund.  (4)

                           (d)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Florida
                                    Municipal Bond Fund.  (4)

                           (e)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Georgia
                                    Municipal Bond Fund.  (4)

                           (f)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Louisiana
                                    Municipal Bond Fund*.  (4)

                           (g)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Maryland
                                    Municipal Bond Fund.  (4)

                           (h)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Massachusetts
                                    Municipal Bond Fund.  (4)

                           (i)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Mississippi
                                    Municipal Bond Fund.  (4)

                           (j)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS New York
                                    Municipal Bond Fund.  (4)

                           (k)      Amended and Restated Distribution Plan
                                    for Class A shares, Plan of Distribution for
                                    Class B shares and Plan of Distribution for
                                    Class C shares for MFS North Carolina
                                    Municipal Bond Fund.  (4)

                           (l)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Pennsylvania
                                    Municipal Bond Fund.  (4)

                           (m)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS South Carolina
                                    Municipal Bond Fund.  (4)

                           (n)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Tennessee
                                    Municipal Bond Fund.  (4)

                           (o)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Texas
                                    Municipal Bond Fund*.  (4)

                           (p)      Amended and Restated Distribution Plan
                                    for Class A shares, Plan of Distribution for
                                    Class B shares and Plan of Distribution for
                                    Class C shares for MFS Virginia Municipal
                                    Bond Fund.  (4)

*No longer in existence
<PAGE>
                           (q)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS Washington
                                    Municipal Bond Fund*.  (4)

                           (r)      Amended and Restated Distribution Plan
                                    for Class A shares and Plan of Distribution
                                    for Class B shares for MFS West Virginia
                                    Municipal Bond Fund.  (4)

                           (s)      Distribution Plan for Class A shares, Plan
                                    of Distribution for Class B shares and Plan
                                    of Distribution for Class C shares for MFS
                                    Municipal Income Fund.  (4)

                  16                Schedule of Computation for Performance
                                    Quotations - Average Annual Total Rate of
                                    Return, Aggregate Total Rate of Return,
                                    Distribution Rate, Tax-Equivalent Yield
                                    and Yield.  (1)
   
                  17                Not Applicable.

                  18                Plan pursuant to Rule 18f-3(d) under the
                                    Investment Company Act of 1940.  (6)
    
                           Power of Attorney, dated August 11, 1994.  (2)
- -----------------------------
*No longer in existence

(1)      Incorporated by reference to Post-Effective Amendment No. 26 to the
         Registration Statement on Form N-1A filed with the SEC via EDGAR on
         February 22, 1995.
(2)      Incorporated by reference to Post-Effective Amendment No. 27 to the
         Registration Statement on Form N-1A filed with the SEC via EDGAR on
         May 31, 1995.
(3)      Incorporated by reference to Post-Effective Amendment No. 8 to the
         Registration Statement 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 Post-Effective Amendment No. 28 to the
         Registration Statement on Form N-1A filed with the SEC via EDGAR on
         July 28, 1995.
   
(5)      Incorporated by reference to Post-Effective Amendment No. 29 to the
         Registration Statement on Form N-1A filed with the SEC via EDGAR on
         July 29, 1996.
(6)      Incorporated by reference to MFS Series Trust I (File Nos. 33-7638
         and 811-4777) Post-Effective Amendment No. 25 filed with the SEC via
         EDGAR on August 27, 1996.
    
Item 25. Persons Controlled by or under Common Control with Registrant

         Not applicable.
<PAGE>
Item 26. Number of Holders of Securities

               (1)                                     (2)
         Title of Class                    Number of Record Holders
   
                                            (As of July 31, 1996)
    
                                            Class A Shares
   
         Shares of Beneficial Interest      Alabama Series             1,364
                  (without par value)       Arkansas Series            3,362
                                            California Series          4,095
                                            Florida Series             1,587
                                            Georgia Series             1,594
                                            Maryland Series            3,911
                                            Massachusetts Series       4,637
                                            Mississippi Series         1,863
                                            New York Series            3,204
                                            North Carolina Series      9,194
                                            Pennsylvania Series          664
                                            South Carolina Series      3,434
                                            Tennessee Series           2,323
                                            Virginia Series            9,237
                                            West Virginia Series       3,057
                                            MFS Municipal Income Fund  3,988

                                            Class B Shares

         Shares of Beneficial Interest      Alabama Series               152
                  (without par value)       Arkansas Series              199
                                            California Series            707
                                            Florida Series               288
                                            Georgia Series               318
                                            Maryland Series              504
                                            Massachusetts Series         340
                                            Mississippi Series           282
                                            New York Series              954
                                            North Carolina Series        982
                                            Pennsylvania Series        1,079
                                            South Carolina Series        509
                                            Tennessee Series             280
                                            Virginia Series              695
                                            West Virginia Series         421
                                            MFS Municipal Income Fund  2,442
    
<PAGE>
                                            Class C Shares
   
         Shares of Beneficial Interest      California Series             86
                  (without par value)       North Carolina Series        206
                                            Virginia Series              102
                                            MFS Municipal Income Fund    483
    
Item 27. Indemnification

         Reference is hereby made to (a) Article V of  Registrant's  Declaration
of  Trust,  filed  as an  Exhibit  to  Post-Effective  Amendment  No.  26 to its
Registration  Statement;  (b) Section 4 of the  Distribution  Agreement  between
Registrant   and  MFS  Fund   Distributors,   Inc.,   filed  as  an  Exhibit  to
Post-Effective  Amendment  No. 26;  and (c) the  undertaking  of the  Registrant
regarding  indemnification set forth in its Registration  Statement as initially
filed.

         The Trustees and officers of the  Registrant  and the  personnel of the
Registrant's  investment adviser and distributor will be 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.

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 16 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  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 Virginia  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
    
<PAGE>
   
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, MFS  International  Funds - U.S.  Dollar Reserve 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.
    
<PAGE>
   
         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.
    
<PAGE>
   
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.
    
<PAGE>
   
         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, Richard W. S. Baker and William F. Waters 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, Jeffrey L.
Shames and William F. Waters 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.
    
<PAGE>
   
         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. and Bruce C. Avery are Directors, Arnold D.
Scott is the Chairman and a Director, 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
and Martin E. Beaulieu are Senior Vice Presidents.

         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 R. 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)
    
<PAGE>
   
         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.

         (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

         Massachusetts Financial Services   500 Boylston Street
         Company (investment adviser)       Boston, MA  02116

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

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

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

Item 31. Management Services

         Not applicable.

Item 32. Undertakings

         (a)  Not applicable.

         (b)  Not applicable.
<PAGE>

         (c)  The  Registrant  undertakes  to  furnish  each  person  to  whom a
prospectus  of a  series  of the  Registrant  is  delivered  with a copy of that
series' latest annual report to shareholders upon request and without 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 27th day of August, 1996.

                                    MFS MUNICIPAL SERIES TRUST


                                    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 August 27, 1996.

         SIGNATURE                          TITLE


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


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


RICHARD B. BAILEY*         Trustee
Richard B. Bailey


MARSHALL N. COHAN*         Trustee
Marshall N. Cohan


LAWRENCE H. COHN*          Trustee
Lawrence H. Cohn


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 and filed with the
                                    Securities and Exchange Commission
                                    on May 31, 1995 with Post-Effective
                                    Amendment No. 27.


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