MFS SERIES TRUST X
497, 2000-10-25
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                             MFS(R)NEW ENDEAVOR FUND

           Supplement dated October 25, 2000 to the Current Prospectus


This Supplement  supplements certain  information in the fund's Prospectus.  The
caption  headings used in this Supplement  correspond with the caption  headings
used in the Prospectus.

1.   Expense Summary

     Expense Table.  This table describes the fees and expenses that you may pay
     when you buy, redeem and hold shares of the fund.

     Shareholder Fees (fees paid directly from your investment):
<TABLE>
<CAPTION>

                                                                   Class A            Class B           Class C
     <S>                                                            <C>                <C>               <C>
     Maximum Sales Charge (Load) Imposed on Purchases (as a
     percentage of offering price)........................          5.75%              0.00%             0.00%

     Maximum Deferred Sales Charge (Load) (as a percentage
     of original purchase price or redemption proceeds,
     whichever is less)...................................       See Below(1)          4.00%             1.00%

     Annual Fund Operating Expenses (expenses that are deducted from fund assets):

     Management Fees......................................          0.90%              0.90%             0.90%
     Distribution and Service (12b-1) Fees(2).............          0.35%              1.00%             1.00%
     Other Expenses.......................................          3.88%              3.88%             3.88%
                                                                    -----              -----             -----
     Total Annual Fund Operating Expenses.................          5.13%              5.78%             5.78%
     Expense Reimbursement(3).............................         (3.93)%            (3.58)%           (3.58)%
                                                                   -------            -------           -------
     Net Expenses(4)......................................          1.20%              2.20%             2.20%
</TABLE>

----------------------------

(1)  An initial  sales charge will not be deducted from your purchase if you buy
     $1 million  or more of class A shares,  or if you are  investing  through a
     retirement  plan and your  class A  purchase  meets  certain  requirements.
     However,  in this case, a contingent deferred sales charge referred to as a
     CDSD of 1% may be deducted from your redemption proceeds if you redeem your
     investment within 12 months.

(2)  The fund  adopted a  distribution  plan under Rule 12b-1 that permits it to
     pay marketing and other fees to support the sale and  distribution of class
     A, B and C  shares  and the  services  provided  to you by  your  financial
     adviser (referred to as distribution and service fees).

(3)  "Other Expenses" for the fund are based on estimates for the fund's current
     fiscal  year.  MFS has  contractually  agreed to bear the  fund's  expenses
     subject to  reimbursement,  such that "Other  Expenses"  after  taking into
     account the  expense  offset  arrangement  described  below,  do not exceed
     0.30%. In addition, the fund's distributor, MFS Fund Distributors, Inc. has
     contractually  agreed to waive the fund's class A distribution  and service
     fees.  These  contractual  fee  arrangements  will continue  until at least
     October 1, 2001,  absent an earlier  modification  approved by the board of
     trustees which oversees the fund.

(4)  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.  The fund may enter into other
     similar  arrangements and directed brokerage  arrangements which would also
     have the effect of reducing the fund's  expenses.  "Other  Expenses" do not
     take into account these expense  reductions,  and therefore are higher than
     the actual  expenses of the fund. Had these fee reductions  been taken into
     account, "Net Expenses" would be lower.

Example of Expenses. These examples are intended to help you compare the cost of
investing in the fund with the cost of investing in other mutual funds.

The example assume that:
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     o    You invest $10,000 in the fund for the time periods  indicated and you
          redeem your shares at the end of the time periods;

     o    Your  investment  has a 5% return  each year and  dividends  and other
          distributions are reinvested; and

     o    The fund's  operating  expenses remain the same except that the fund's
          total  operating  expenses are assumed to be the fund's "Net Expenses"
          for the first  year,  and the  fund's  "Total  Annual  Fund  Operating
          Expenses" for subsequent years (see Expense Table).

Although your actual costs may be higher or lower,  under these assumptions your
costs would be:

     Share Class                                        Year 1        Year 3
     Class A shares                                      $685         $1,688
     Class B Shares
          Assuming redemption at end of period            583          1,667
          Assuming no redemption                          183          1,367
     Class C Shares
          Assuming redemption at end of period            283          1,367
          Assuming no redemption                          183          1,367

2.   DESCRIPTION OF SHARE CLASSES

     Distribution and Service Fees

     The fund has  adopted  a plan  under  Rule  12b-1  that  permits  it to pay
     marketing and other fees to support the sale and distribution of class A, B
     and C shares and the services  provided to you by your  financial  adviser.
     These annual  distribution and service fees may equal up to 0.35% for class
     A shares (0.10%  distribution fee and 0.25% service fee) and 1.00% for each
     of class B and class C shares (a 0.75% distribution fee and a 0.25% service
     fee),  and are paid out of the assets of these  classes.  Over time,  these
     fees  will  increase  the cost of your  shares  and may cost you more  than
     paying  other types of sales  charges.  MFD has waived its right to receive
     the class A service fee and the class A distribution fee as described under
     "Expense Summary".


                The date of this Supplement is October 25, 2000.


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