MFS SERIES TRUST IX /MA/
497, 1997-01-06
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                            MFS LIMITED MATURITY FUND

                  SUPPLEMENT TO THE SEPTEMBER 1, 1996 PROSPECTUS AND 
                         STATEMENT OF ADDITIONAL INFORMATION



     THE FOLLOWING  INFORMATION  SHOULD BE READ IN  CONJUNCTION  WITH THE FUND'S
PROSPECTUS AND STATEMENT OF ADDITIONAL  INFORMATION ("SAI"),  DATED SEPTEMBER 1,
1996, AND CONTAINS A DESCRIPTION OF CLASS I SHARES.

     CLASS I SHARES ARE  AVAILABLE  FOR  PURCHASE  ONLY BY CERTAIN  INVESTORS AS
DESCRIBED UNDER THE CAPTION "ELIGIBLE PURCHASERS" BELOW.

EXPENSE SUMMARY

SHAREHOLDER TRANSACTION EXPENSES:                                      CLASS I
   Maximum Initial Sales Charge Imposed on Purchases of Fund
     Shares (as a percentage of offering price)........................  None
   Maximum Contingent Deferred Sales Charge (as a percentage
     of original purchase price or redemption proceeds, as applicable).  None

ANNUAL OPERATING EXPENSES OF THE FUND (AS A PERCENTAGE OF AVERAGE NET ASSETS):
   Management Fees.....................................................  0.40%
   Rule 12b-1 Fees.....................................................  None
   Other Expenses(1)(2)................................................  0.40%
                                                                         -----
   Total Operating Expenses............................................  0.80%
 ..............
(1)  "Other  Expenses" is based on Class A expenses  incurred  during the fiscal
     year ended April 30, 1996.
(2)  The Fund  has an  expense  offset  arrangement  which  reduces  the  Fund's
     custodian fee based upon the amount of cash maintained by the Fund with its
     custodian  and  dividend  disbursing  agent,  and may enter into other such
     arrangements and directed brokerage arrangements (which would also have the
     effect of reducing the Fund's  expenses).  Any such fee  reductions are not
     reflected under "Other Expenses."

                               EXAMPLE OF EXPENSES

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

                           PERIOD                              CLASS I

                           1 year.......................         $ 8
                           3 years......................          26

     The  purpose  of  the  expense  table  above  is  to  assist  investors  in
understanding the various costs and expenses that a shareholder of the Fund will
bear  directly  or  indirectly.  A  more  complete  description  of  the  Fund's
management  fee is set forth under the caption  "Management  of the Fund" in the
Prospectus.

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

ELIGIBLE PURCHASERS

Class I shares are  available  for  purchase  only by the  following  purchasers
("Eligible Purchasers"):

(i)  certain  retirement  plans  established  for the  benefit of  employees  of
     Massachusetts  Financial  Services Company ("MFS"),  the Fund's  investment
     adviser, and employees of MFS' affiliates; and

(ii) any fund distributed by MFS Fund  Distributors,  Inc.  ("MFD"),  the Fund's
     distributor,  if the fund  seeks to achieve  its  investment  objective  by
     investing  primarily in shares of the Fund and other funds  distributed  by
     MFD.

In no event will the Fund,  MFS,  MFD or any of their  affiliates  pay any sales
commissions or  compensation  to any third party in connection  with the sale of
Class I shares; the payment of any such sales commission or compensation  would,
under the Fund's policies,  disqualify the purchaser as an eligible  investor of
Class I shares.
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SHARE CLASSES OFFERED BY THE FUND

     Four classes of shares of the Fund currently are offered for sale,  Class A
shares,  Class B shares,  Class C shares and Class I shares.  Class I shares are
available for purchase only by Eligible  Purchasers,  as defined above,  and are
described in this Supplement.  Class A shares, Class B shares and Class C shares
are  described in the Fund's  Prospectus  and are  available for purchase by the
general public.

     Class A shares are offered at net asset value plus an initial  sales charge
up to a maximum of 2.50% of the offering  price (or a contingent  deferred sales
charge (a "CDSC") upon  redemption of 1.00% during the first year in the case of
purchases of $1 million or more and certain purchases by retirement  plans), and
are  subject to an annual  distribution  fee and  service fee up to a maximum of
0.35% per  annum.  Class B shares  are  offered  at net asset  value  without an
initial sales charge but are subject to a CDSC upon  redemption  (declining from
4.00%  during the first  year to 0% after six years) and an annual  distribution
fee and service fee up to a maximum of 1.00% per annum;  Class B shares  convert
to Class A shares  approximately eight years after purchase.  Class C shares are
offered at net asset value  without an initial sales charge but are subject to a
CDSC upon  redemption of 1.00% during the first year and an annual  distribution
fee and  service  fee up to a maximum  of 1.00% per  annum.  Class I shares  are
offered at net asset value  without an initial  sales charge or CDSC and are not
subject  to a  distribution  or service  fee.  Class C and Class I shares do not
convert to any other class of shares of the Fund.

OTHER INFORMATION

     Eligible  Purchasers may purchase Class I shares only directly through MFD.
Eligible  Purchasers  may exchange Class I shares of the Fund for Class I shares
of any other MFS Fund  available  for purchase by such  Eligible  Purchasers  at
their net asset value (if available for sale),  and may exchange  Class I shares
of the Fund for shares of the MFS Money Market Fund (if available for sale), and
may redeem Class I shares of the Fund at net asset value.  Distributions paid by
the Fund with  respect to Class I shares  generally  will be greater  than those
paid with respect to Class A shares,  Class B shares and Class C shares  because
expenses  attributable  to Class A  shares,  Class B shares  and  Class C shares
generally will be higher.

     The Adviser has agreed to pay certain  expenses of the Fund (except for the
fees paid under the Advisory  Agreement)  until February 28, 2002 and to pay the
expenses  relating to the organization of the Fund, all subject to reimbursement
by the Fund. To accomplish such  reimbursement,  the Adviser receives an expense
reimbursement  fee from the Fund in addition  to the  investment  advisory  fee,
computed and paid monthly at a rate of 0.40% per annum of the average  daily net
assets of the Fund. The expense reimbursement  agreement terminates for the Fund
on the earlier of either (i) the date on which the payments  made  thereunder by
the Fund equal the prior payment of such reimbursable expenses by the Adviser or
(ii) February 28, 2002. The Adviser may also terminate the expense reimbursement
agreement at any time by written notice to the Trust.

                 THE DATE OF THIS SUPPLEMENT IS JANUARY 1, 1997


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