MFS INSTITUTIONAL TRUST
485BPOS, 1997-01-10
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<PAGE>
   
    As filed with the Securities and Exchange Commission on January 10, 1997
    

                           1933 Act File No. 33-37615
                           1940 Act File No. 811-6174

================================================================================
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                                ---------------

                                   FORM N-1A
                             REGISTRATION STATEMENT
                                     UNDER
                           THE SECURITIES ACT OF 1933
   
                        POST-EFFECTIVE AMENDMENT NO. 14
    
                                      AND
                             REGISTRATION STATEMENT
                                     UNDER
                       THE INVESTMENT COMPANY ACT OF 1940
   
                                AMENDMENT NO. 18
    

                            MFS INSTITUTIONAL 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 January 10, 1997 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

                        STATEMENT PURSUANT TO RULE 24f-2

Pursuant to Rule 24f-2,  the Registrant  has registered an indefinite  number of
securities  under the  Securities Act of 1933 and filed a Rule 24f-2 Notice with
respect to its fiscal year ended June 30, 1996 on August 28, 1996.

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

   
The Prospectus and Statement of Additional Information,  dated November 1, 1996,
of MFS  Institutional  Core  Plus  Fixed  Income  Fund is  incorporated  in this
Post-Effective  Amendment No. 14 by reference to such  documents  filed with the
Securities  and  Exchange  Commission  via EDGAR on  October  30,  1996,  by the
Registrant pursuant to Rule 497 under the Securities Act of 1933, as amended.
    
<PAGE>

                MFS(R) INSTITUTIONAL CORE PLUS FIXED INCOME FUND

      SUPPLEMENT TO THE NOVEMBER 1, 1996 STATEMENT OF ADDITIONAL INFORMATION



                       Statement of Assets and Liabilities
                                  June 30, 1996


       Assets:
            Cash                                         $   110
            Deferred organizational expenses              17,600
                                                         -------
               Total assets                              $17,710


      Liabilities:
           Accrued expenses                               17,600
                                                         -------
               Net assets for 11 shares of
               beneficial interest outstanding           $   110
                                                        ========


      Net Asset Value, Redemption Price
              and Offering Price Per Share               $    10.00
                                                        ===========



NOTES:

(1)      The MFS  Institutional  Core Plus Fixed  Income  Fund (the  "Fund") was
         organized  as a series of MFS  Institutional  Trust  (the  "Trust"),  a
         business trust under the laws of The Commonwealth of Massachusetts. The
         Trust  consists of seven  series of shares or funds.  The Fund has been
         inactive  except  for  matters   relating  to  its   organization   and
         registration as an investment  company under the Investment Company Act
         of 1940 and the  sale of 11  shares  of  beneficial  interest  (initial
         shares) to Massachusetts Financial Services Company.

(2)      Organizational  expenses are being  deferred and will be amortized over
         five years beginning with the  commencement  of investment  operations.
         The  amount  paid  by the  Fund  on  any  redemption  by  Massachusetts
         Financial Services Company, or any current holder of any fund's initial
         shares,  will be  reduced by the pro rata  portion  of any  unamortized
         organizational  expenses  which the number of initial  shares  redeemed
         bears to the total  number of initial  shares  outstanding  immediately
         prior to such redemption.


<PAGE>


INDEPENDENT AUDITORS' REPORT

To the Trustees of MFS Institutional Trust and Shareholders of MFS Institutional
Core Plus Fixed Income Fund:

         We have audited the accompanying statement of assets and liabilities of
MFS Institutional  Core Plus Fixed Income Fund (one of the series comprising MFS
Institutional  Trust)  as of June 30,  1996.  This  financial  statement  is the
responsibility  of the Fund's  management.  Our  responsibility is to express an
opinion on this financial statement based on our audit.

         We conducted our audit in accordance with generally  accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable  assurance  about whether the statement of assets and  liabilities is
free of material  misstatement.  An audit includes  examining,  on a test basis,
evidence  supporting the amounts and  disclosures in the statement of assets and
liabilities. An audit also includes assessing the accounting principles used and
significant  estimates  made by  management,  as well as evaluating  the overall
financial statement presentation.  We believe that our audit of the statement of
assets and liabilities provides a reasonable basis for our opinion.

         In our  opinion,  such  statement  of assets and  liabilities  presents
fairly, in all material  respects,  the financial  position of MFS Institutional
Core Plus  Fixed  Income  Fund at June 30,  1996 in  conformity  with  generally
accepted accounting principles.



DELOITTE & TOUCHE, LLP
Boston, Massachusetts
August 2, 1996








                THE DATE OF THIS SUPPLEMENT IS JANUARY 10, 1997.

<PAGE>


                                     PART C


Item 24. Financial Statements and Exhibits

         (a)      Financial Statements

   
                  MFS Institutional Core Plus Fixed Income Fund

                  Included in Part A of this Registration Statement:
                           Not Applicable

                  Included in Part B of this Registration Statement: At June 30,
                           1996:
    
                           Statement of Assets and Liabilities
<PAGE>

         (b)      Exhibits on Behalf of MFS Institutional Trust

                   1       (a)      Declaration of Trust, dated September
                                    13, 1990.  (1)

                           (b)      Certificate of Amendment to
                                    Declaration of Trust, dated June 1,
                                    1992.  (1)

                           (c)      Amendment No. 2 to the Declaration of
                                    Trust, dated August 13, 1992.  (1)

                           (d)      Amendment to Declaration of Trust -
                                    Designation of Series, dated May 16,
                                    1995. (1)

                           (e)      Amendment to Declaration of Trust -
                                    Designation of Series, dated August 29,
                                    1995. (2)

                           (f)      Amendment to Declaration of Trust -
                                    Redesignation of Series, dated October
                                    31, 1995. (7)

                           (g)      Amendment to Declaration of Trust -
                                    Redesignation of Series, dated
                                    November 28, 1995.  (7)
<PAGE>

                           (h)      Amendment to Declaration of Trust -
                                    Redesignation of Series, dated April 24,
                                    1996. (8)

                   2       (a)      Amended and Restated By-Laws, dated
                                    June 1, 1992.  (5)

                           (b)      Amendment No. 1 to Amended and
                                    Restated By-Laws, dated October 14,
                                    1993.  (5)

                   3                Not Applicable.

                   4                Form of Share Certificate.  (4)

                   5       (a)      Investment Advisory Agreement
                                    between MFS Emerging Equities Fund
                                    and Massachusetts Financial Services
                                    Company, as adviser, dated August 7,
                                    1992. (5)

                           (b)      Investment Advisory Agreement
                                    between MFS Worldwide Fixed Income
                                    Fund and Massachusetts Financial
                                    Services Company, as adviser, dated
                                    August 7, 1992.  (5)

                           (c)      Investment Advisory Agreement
                                    between the Registrant, on behalf of
                                    MFS Institutional Emerging Markets
                                    Fixed Income Fund, and Massachusetts
                                    Financial Services Company, as adviser,
                                    dated November 30, 1995.  (1)

                           (d)      Investment Advisory Agreement
                                    between the Registrant, on behalf of
                                    MFS Institutional Core Plus Fixed
                                    Income Fund, and Massachusetts
                                    Financial Services Company, as adviser,
                                    dated November 30, 1995.  (7)

                           (e)      Investment Advisory Agreement
                                    between the Registrant, on behalf of
                                    MFS Institutional Research Fund, and
                                    Massachusetts Financial Services
                                    Company, as adviser, dated November
                                    30, 1995.  (7)

                           (f)      Investment Advisory Agreement
                                    between the Registrant, on behalf of
                                    MFS Institutional Mid-Cap Growth
                                    Equity Fund, and Massachusetts
                                    Financial Services Company, as adviser,
                                    dated November 30, 1995.  (7)

                           (g)      Investment Advisory Agreement
                                    between the Registrant, on behalf of
                                    MFS Institutional International Equity
                                    Fund, and Massachusetts Financial
                                    Services Company, as adviser, dated
                                    November 30, 1995.  (7)

                   6                Not Applicable.

                   7                Not Applicable.
<PAGE>

                   8       (a)      Custodian Agreement between the
                                    Registrant and State Street Bank and
                                    Trust Company, dated July 31, 1995. (2)

                           (b)      Amendment to Custodian Contract
                                    dated November 30, 1995.  (7)

                   9       (a)      Amended and Restated Shareholder
                                    Servicing Agent Agreement between
                                    Registrant and MFS Service Center, Inc.
                                    as Shareholder Servicing Agent dated
                                    November 30, 1995. (7)

                           (b)      Exchange Privilege Agreement between the MFS
                                    Institutional  Trust,  on  behalf of each of
                                    its series, and MFS Fund Distributors, Inc.,
                                    dated July 26,
                                    1995.  (7)

                           (c)      Dividend Disbursing Agency
                                    Agreement between the Registrant and
                                    State Street Bank and Trust Company,
                                    dated October 31, 1990. (5)

                           (d)      Loan Agreement by and among the
                                    Banks named therein, the MFS Funds
                                    named therein and The First National
                                    Bank of Boston, dated February 21,
                                    1995. (6)

                  10                Consent and Opinion of Counsel filed
                                    with Registrant's Rule 24f-2 Notice for
                                    the fiscal year ended June 30, 1996 on
                                    August 28, 1996.

                  11                Consent of Deloitte & Touche LLP; filed
                                    herewith.

                  12                Not Applicable.

                  13       (a)      Investment representation letter from
                                    initial shareholder of MFS Institutional
                                    Emerging Markets Fixed Income
                                    Fund.  (1)

                  14                Not Applicable.

                  15                Distribution Agreement by and between
                                    MFS Institutional Trust and MFS Fund
                                    Distributors, Inc., dated June 15,
                                    1994.  (5)

                  16                Schedule of Computation for
                                    Performance Quotations - Aggregate
                                    Total Rate of Return, Average Annual
                                    Total Rate of Return and Yield
                                    Calculations.  (3)

   
                  17                Not Applicable.
    
<PAGE>

                  18                Not Applicable.

                  Power of Attorney dated August 12, 1994.  (5)

(1)   Incorporated by reference to Post-Effective Amendment No. 7 to the
      Registrant's Registration Statement on Form N-1A filed with the SEC via
      EDGAR on May 18, 1995.
(2)   Incorporated by reference to Post-Effective Amendment No. 8 to the
      Registrant's Registration Statement on Form N-1A filed with the SEC via
      EDGAR on September 15, 1995.
(3)   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.
(4)   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.
(5)   Incorporated by reference to Post-Effective Amendment No. 9 filed with
      the SEC via EDGAR on October 27, 1995.
(6)   Incorporated by reference to Post-Effective Amendment No. 28 on Form N-2
      for MFS Municipal Income Trust (File No. 811-4841), filed with the SEC
      via EDGAR on February 28, 1995.
(7)   Incorporated by reference to Post-Effective Amendment No. 10 to the
      Registrant's Registration Statement on Form N-1A filed with the SEC via
      EDGAR on February 8, 1996.
(8)   Incorporated by reference to Post-Effective Amendment No. 11 to the
      Registrant's Registration Statement on Form N-1A filed with the SEC via
      EDGAR on April 26, 1996.

Item 25. Persons Controlled by or under Common Control with Registrant

                  Not applicable

Item 26. Number of Holders of Securities

         MFS Institutional Emerging Equities Fund

                  (1)                                (2)
         Title of Class                     Number of Record Holders

   
         Shares of Beneficial Interest               39
         (without par value)                (as of December 31,1996)
    

         MFS Institutional Worldwide Fixed Income Fund

                  (1)                                (2)
         Title of Class                     Number of Record Holders

   
         Shares of Beneficial Interest               22
         (without par value)                (as of December 31,1996)
    
<PAGE>

         MFS Institutional Emerging Markets Income Fund

                  (1)                                (2)
         Title of Class                     Number of Record Holders

   
         Shares of Beneficial Interest                4
         (without par value)                (as of December 31,1996)
    

         MFS Institutional Core Plus Fixed Income Fund

                  (1)                                (2)
         Title of Class                     Number of Record Holders

   
         Shares of Beneficial Interest                3
         (without par value)                (as of December 31,1996)
    

         MFS Institutional Research Fund

                  (1)                                (2)
         Title of Class                     Number of Record Holders

   
         Shares of Beneficial Interest                4
         (without par value)                (as of December 31,1996)
    

         MFS Institutional Mid-Cap Growth Equity Fund

                  (1)                                (2)
         Title of Class                     Number of Record Holders

   
         Shares of Beneficial Interest                6
         (without par value)                (as of December 31,1996)
    

         MFS Institutional International Equity Fund

                  (1)                                (2)
         Title of Class                     Number of Record Holders

   
         Shares of Beneficial Interest                6
         (without par value)                (as of December 31,1996)
    
<PAGE>

Item 27. Indemnification

         Article V of the  Registrant's  Declaration  of Trust provides that the
Registrant  will  indemnify its Trustees and officers  against  liabilities  and
expenses  incurred in connection  with  litigation in which they may be involved
because  of their  offices  with the  Trust,  unless  as to  liabilities  to the
Registrant or its shareholders,  it is finally  adjudicated that they engaged in
willful  misfeasance,  bad faith,  gross negligence or reckless disregard of the
duties  involved in their  offices,  or with respect to any matter  unless it is
adjudicated  that they did not act in good faith in the  reasonable  belief that
their  actions  were in the best  interest of the  Registrant.  In the case of a
settlement,  such  indemnification  will  not be  provided  unless  it has  been
determined in  accordance  with the  Declaration  of Trust that such officers or
Trustees have not engaged in willful misfeasance, bad faith, gross negligence or
reckless disregard of the duties involved in their offices.

         The Trustees and officers of the  Registrant  and the  personnel of the
Registrant's  investment  adviser  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 thirteen 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,  MFS  Special
Opportunities Fund, MFS Convertible Securities Fund, MFS Blue Chip Fund, MFS New
Discovery Fund, MFS Science and Technology  Fund and MFS Research  International
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
<PAGE>
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 MFS 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 MFS Closed-End Funds is 500 Boylston
Street, Boston, Massachusetts 02116.

         Lastly,  MFS serves as investment  adviser to MFS/Sun Life Series Trust
("MFS/SL"),  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 of the aforementioned
funds is One Sun Life Executive Park, Wellesley Hills, Massachusetts 02181.

         MFS International  Ltd. ("MIL"),  a limited liability company organized
under the laws of Bermuda and a  subsidiary  of MFS,  whose  principal  business
address is Cedar  House,  41 Cedar  Avenue,  Hamilton  HM12  Bermuda,  serves as
investment  adviser to and  distributor  for MFS  American  Fund  (which has six
portfolios:  MFS  American  Funds-U.S.  Equity  Fund,  MFS  American  Funds-U.S.
Emerging Growth Fund, MFS American Funds-U.S. High Yield Bond Fund, MFS American
Funds - U.S. Dollar Reserve Fund, MFS American Funds-Charter Income Fund and MFS
American  Funds-U.S.  Research  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, MFS Meridian  Research Fund and MFS
Emerging Markets Debt 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
<PAGE>

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 Institutional  Advisors,  Inc. ("MFSI"),  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,  Donald A. Stewart 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,  Robert T. Burns is
a Senior Vice President,  Associate  General Counsel and an Assistant  Secretary
of MFS, and Thomas B. Hastings is a Vice President and Treasurer of MFS.

         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., Senior
Vice  President  and  Associate   General  Counsel  of  MFS,  is  the  Assistant
Secretary.
<PAGE>

         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,  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 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,  Assistant  Vice  President  of MFS, and Daniel E.  McManus,  Vice
President  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.
<PAGE>

         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,  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,  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 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.

         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,
Senior Vice President and Chief  Financial  Officer of MFS, is the Treasurer and
Thomas B. Hastings is the Assistant Treasurer.
<PAGE>

         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.

         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.
<PAGE>

         MFSI

         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

         Donald                     A.  Stewart  President  and a Director,  Sun
                                    Life Assurance  Company of Canada,  Sun Life
                                    Centre,  150  King  Street  West,   Toronto,
                                    Ontario,  Canada  (Mr.  Stewart  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.
<PAGE>

         (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 Registrant's  corporate documents are kept by the Registrant at its
offices.   Portfolio  brokerage  orders,  other  purchase  orders,  reasons  for
brokerage  allocation and lists of persons  authorized to transact  business for
the  Registrant  are kept by  Massachusetts  Financial  Services  Company at 500
Boylston Street,  Boston,  Massachusetts 02116.  Shareholder account records are
kept by MFS Service Center, Inc. at 500 Boylston Street,  Boston,  Massachusetts
02116.  Transaction  journals,  receipts  for the  acceptance  and  delivery  of
securities  and cash,  ledgers and trial  balances are kept by State Street Bank
and Trust Company at State Street  South,  5-West,  North Quincy,  Massachusetts
02171.

Item 31. Management Services

         Not applicable.

Item 32. Undertakings

         (a)      Not applicable.

         (b) The  Registrant  undertakes to file a  post-effective  amendment to
this registration  statement,  in order to file financial statements for the MFS
Institutional  Core Plus Fixed Income Fund, which need not be certified,  within
four to six months of the commencement of investment operations of the Fund.

         (c)  Registrant  undertakes to furnish each person to whom a prospectus
is  delivered  with a copy of its  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 10th day of January, 1997.

                                    MFS INSTITUTIONAL 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 January 10, 1997.

         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)


WILLIAM R. GUTOW*          Trustee
William R. Gutow


NELSON J. DARLING, JR.*    Trustee
Nelson J. Darling, Jr.


                                    *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 12, 1994,
                                    filed with Post-Effective Amendment
                                    No. 9 on October 27, 1995.
<PAGE>
                               INDEX TO EXHIBITS



EXHIBIT NO.       DESCRIPTION OF EXHIBIT    PAGE NO.

   
  11         Consent of Deloitte & Touche LLP.
    

<PAGE>
                                                     EXHIBIT NO. 99.11



                         INDEPENDENT AUDITORS' CONSENT



         We  consent  to the  use in this  Post-Effective  Amendment  No.  14 to
Registration  Statement No. 33-37615 of MFS Institutional Trust, relating to the
statement of assets and liabilities,  as of June 30, 1996, of MFS  Institutional
Core Plus Fixed Income Fund of our report dated August 2, 1996.



DELOITTE & TOUCHE, LLP
Deloitte & Touche, LLP
Boston, Massachusetts
January 10, 1997


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