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                             MFS INSTITUTIONAL TRUST

                 MFS INSTITUTIONAL WORLDWIDE FIXED INCOME FUND
                                  (THE "FUND")


                 Supplement to the December 1, 1995 Prospectus


The  description of portfolio  manager on page 22 of the Prospectus with respect
to the Fund has been deleted and replaced in its entirety by the following:

         "Richard O. Hawkins,  a Senior Vice President of the Adviser,  has been
         employed as a portfolio  manager by the Adviser since 1988 and has been
         the Fund's portfolio manager since January 1, 1996."

                The date of this Supplement is January 31, 1996.



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