MFS GOVERNMENT SECURITIES FUND
497, 1996-03-04
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                         MFS Government Securities Fund

                   Supplement to the July 1, 1995 Prospectus



The following  information replaces the "Expense Summary" section found on pages
2 and 3 of the Fund's Prospectus dated July 1, 1995:

Expense Summary

Shareholder Transaction Expenses:                   Class A           Class B

Maximum Initial Sales Charge Imposed on
  Purchases of Fund Shares (as a percentage
  of offering price)                                 4.75%             0.00%
Maximum Contingent Deferred Sales Charge
  (as a percentage of original purchase price
  or redemption proceeds, as applicable)          See Below(1)         4.00%

Annual Operating Expenses (as a percentage of average net assets):

Management Fees (after applicable fee
  reduction)(2)                                      0.25%             0.25%
Rule 12b-1 Fees                                      0.35(3)           1.00(4)
Other Expenses                                       0.30              0.37
Total Operating Expenses (after applicable
  fee reduction)(5)                                  0.90%             1.62%

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(1)   Purchases  of $1  million  or more are not  subject  to an  initial  sales
      charge;  however,  a CDSC of 1% will be imposed on such  purchases  in the
      event of certain redemption  transactions  within 12 months following such
      purchases (see "Purchases" below).

(2)   The Adviser has voluntarily  reduced its management fee to 0.25% per annum
      of the Fund's  average daily net assets for an indefinite  period of time.
      Absent such reduction, "Management Fees" would have been 0.40%.

(3)   The  Fund has  adopted  a  Distribution  Plan  for its  Class A shares  in
      accordance  with Rule 12b-1 under the  Investment  Company Act of 1940, as
      amended   (the   "1940   Act"),   which   provides   that  it   will   pay
      distribution/service  fees  aggregating up to (but not necessarily all of)
      0.35% per  annum of the net  assets  of the Fund  attributable  to Class A
      shares (see "Distribution Plans" in the Prospectus). Distribution expenses
      paid under this Plan,  together with the initial  sales charge,  may cause
      long-term  shareholders  to pay more than the  maximum  sales  charge that
      would be permissible if imposed entirely as an initial sales charge.

(4)   The  Fund has  adopted  a  Distribution  Plan  for its  Class B shares  in
      accordance with Rule 12b-1 under the 1940 Act, which provides that it will
      pay  distribution/service  fees  aggregating  up to 1.00% per annum of the
      average net daily assets attributable to its Class B shares.  Distribution
      expenses paid under this Plan, together with any CDSC, may cause long-term
      shareholders  to pay more than the  maximum  sales  charge that would have
      been permissible if imposed entirely as an initial sales charge.

(5)   Absent the  reduction  in the Fund's  management  fees,  "Total  Operating
      Expenses" for Class A and Class B shares of the Fund would have been 1.05%
      and 1.77%, respectively.

                               Example of Expenses

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

         Period                     Class A             Class B
                                                             (1)

         1 year                     $ 56             $ 56     $ 16
         3 years                      75               81       51
         5 years                      95              108       88
         10 years                    153              173(2)   173(2)

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(1)   Assumes no redemption.

(2)   Class B shares convert to Class A shares  approximately  eight years after
      purchase; therefore years nine and ten reflect Class A expenses.

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.  More complete descriptions of the following expenses of the Fund
are set forth in the following  sections of this  Prospectus:  (i) varying sales
charges on share purchases - "Purchases"; (ii) varying CDSCs "Purchases";  (iii)
management fees - "Investment Adviser"; and (iv) Rule 12b-1 (I.E.,  distribution
plan) fees - "Distribution Plans."

The  "Example"  set forth above  reflects the  imposition  of the maximum  sales
charge and should not be considered a representation  of past or future expenses
of a Fund; actual expenses may be greater or less than those shown.

In  addition,  the  first  sentence  at the top of page 9 of the  Prospectus  is
deleted in its entirety and replaced by the following sentence: "Effective March
1, 1996, the Adviser has voluntarily  agreed to reduce the Fund's management fee
to 0.25% of the Fund's  average  daily net assets  for an  indefinite  period of
time."

                 The date of this Supplement is March 1, 1996.


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