MFS SERIES TRUST IX /MA/
497, 2000-09-05
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                     MFS(R) International Opportunities Fund
                   MFS(R) International Strategic Growth Fund
                         MFS(R) International Value Fund
                 MFS(R) Intermediate Investment Grade Bond Fund
                            MFS(R) Research Bond Fund
                       MFS(R) Emerging Opportunities Fund
                           MFS(R) Large Cap Value Fund
                          MFS(R) High Quality Bond Fund
                           MFS(R) Strategic Value Fund
                        MFS(R) Emerging Markets Debt Fund
                               MFS(R) Income Fund
                           MFS(R) European Equity Fund
                             MFS(R) High Yield Fund
                         MFS(R) Concentrated Growth Fund
                              VertexSM All Cap Fund
                            VertexSM Contrarian Fund
                              VertexSM Income Fund
                    MFS(R) New York High Income Tax Free Fund
                 MFS(R) Massachusetts High Income Tax Free Fund


          Supplement to the Current Statement of Additional Information

The following  provisions  shall apply to any  retirement  plan (each a "Merrill
Lynch Daily K Plan") whose records are maintained on a daily  valuation basis by
either Merrill Lynch, Pierce, Fenner & Smith Incorporated  ("Merrill Lynch"), or
by an independent  recordkeeper (an "Independent  Recordkeeper")  whose services
are provided through a contract or alliance  arrangement with Merrill Lynch, and
with respect to which the sponsor of such plan has entered into a  recordkeeping
service   agreement   with  Merrill  Lynch  (a  "Merrill   Lynch   Recordkeeping
Agreement").

The initial  sales  charge  imposed on purchases of Class A shares of the Funds,
and the contingent deferred sales charge ("CDSC") imposed on certain redemptions
of Class A shares of the Funds,  is waived in the following  circumstances  with
respect to a Merrill Lynch Daily K Plan:

         (i)   if,  on the  date  the  Plan  sponsor  signs  the  Merrill  Lynch
               Recordkeeping  Agreement,  such  Plan has $3  million  or more in
               assets  invested  in  broker-dealer  sold  funds not  advised  or
               managed by Merrill Lynch Asset Management L.P.  ("MLAM") that are
               made available  pursuant to agreements  between Merrill Lynch and
               such funds' principal underwriters or distributors,  and in funds
               advised  or  managed  by  MLAM  (collectively,   the  "Applicable
               Investments"); or

         (ii)  if  such  Plan's   records  are   maintained  by  an  Independent
               Recordkeeper  and, on the date the Plan sponsor signs the Merrill
               Lynch Recordkeeping  Agreement,  such Plan has $3 million or more
               in assets,  excluding money market funds,  invested in Applicable
               Investments; or

         (iii) such Plan has 500 or more  eligible  employees,  as determined by
               the Merrill  Lynch plan  conversion  manager on the date the Plan
               sponsor signs the Merrill Lynch Recordkeeping Agreement.

The CDSC imposed on  redemptions  of Class B shares of the Fund is waived in the
following circumstances with respect to a Merrill Lynch Daily K Plan:

         (i)   if,  on the  date  the  Plan  sponsor  signs  the  Merrill  Lynch
               Recordkeeping  Agreement,  such Plan has less than $3  million in
               assets invested in Applicable Investments;

         (ii)  if  such  Plan's   records  are   maintained  by  an  independent
               recordkeeper  and, on the date the Plan sponsor signs the Merrill
               Lynch Recordkeeping Agreement, such Plan has less than $3 million
               dollars in assets,  excluding  money  market  funds,  invested in
               Applicable Investments; or

         (iii) such Plan has fewer than 500 eligible employees, as determined by
               the Merrill  Lynch plan  conversion  manager on the date the Plan
               sponsor signs the Merrill Lynch Recordkeeping Agreement.
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No front-end  commissions are paid with respect to any Class A or Class B shares
of the Fund purchased by any Merrill Lynch Daily K Plan.


  The date of this Supplement is August 1, 1999 (as revised September 1, 2000).



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