<PAGE>
MFS(R) HIGH YIELD OPPORTUNITIES FUND
Supplement to the Current Prospectus
During the period from August 3, 1998, through August 31, 1998 (unless
extended by MFS Fund Distributors, Inc. ("MFD")) (the "Sales Period"), MFD will
pay Cadaret Grant & Co., Inc. 100% of the applicable sales charge on sales of
Class A shares of the Fund sold by them during the Sales Period. In addition,
MFD will pay Cadaret Grant & Co., Inc. an additional commission equal to 0.50%
of the net asset value of all of the Class B shares of the Fund sold by them
during the Sales Period.
The date of this Supplement is August 3, 1998.
<PAGE>
MFS(R) HIGH YIELD OPPORTUNITIES FUND
Supplement to the Current Prospectus
During the period from August 3, 1998, through August 31, 1998 (unless
extended by MFS Fund Distributors, Inc. ("MFD")) (the "Sales Period"), MFD will
pay Nathan & Lewis Securities, Inc. 100% of the applicable sales charge on sales
of Class A shares of the Fund sold by them during the Sales Period. In addition,
MFD will pay Nathan & Lewis Securities, Inc. an additional commission equal to
0.50% of the net asset value of all of the Class B shares of the Fund sold by
them during the Sales Period.
The date of this Supplement is August 3, 1998.
<PAGE>
MFS(R) HIGH YIELD OPPORTUNITIES FUND
Supplement to the Current Prospectus
During the period from August 3, 1998, through August 31, 1998 (unless
extended by MFS Fund Distributors, Inc. ("MFD")) (the "Sales Period"), MFD will
pay EQ Financial Consultants, Inc. 100% of the applicable sales charge on sales
of Class A shares of the Fund sold by them during the Sales Period. In addition,
MFD will pay EQ Financial Consultants, Inc. an additional commission equal to
0.50% of the net asset value of all of the Class B shares of the Fund sold by
them during the Sales Period.
The date of this Supplement is August 3, 1998.
<PAGE>
MFS(R) HIGH YIELD OPPORTUNITIES FUND
Supplement to the Current Prospectus
During the period from August 3, 1998, through August 31, 1998 (unless
extended by MFS Fund Distributors, Inc. ("MFD")) (the "Sales Period"), MFD will
pay Commonwealth Equity Services 100% of the applicable sales charge on sales of
Class A shares of the Fund sold by them during the Sales Period. In addition,
MFD will pay Commonwealth Equity Services an additional commission equal to
0.50% of the net asset value of all of the Class B shares of the Fund sold by
them during the Sales Period.
The date of this Supplement is August 3, 1998.
