<PAGE>
MFS VALUE FUND
MFS EMERGING GROWTH FUND
MFS RESEARCH FUND
Supplement to the Current Prospectus
During the period from January 2, 1996 through February 29, 1996
(unless extended by MFS Fund Distributors, Inc. ("MFD")) (the "Sales Period"),
MFD will pay Morgan Keegan & Company, Inc. ("Morgan Keegan") 100% of the
applicable sales charge on sales of Class A shares of each of the funds listed
above (the "Funds") sold by Morgan Keegan during the Sales Period. In addition,
MFD will pay Morgan Keegan an additional commission equal to 0.50% of the net
asset value of all of the Class B shares of the Fund sold by Morgan Keegan
during the Sales Period.
The date of this Supplement is January 1, 1996.