<PAGE>
MFS(R) GLOBAL TELECOMMUNICATIONS FUND
Supplement to the Current Statement of Additional Information
The fund's distributor, MFS Fund Distributors, Inc. ("MFD"), will solicit
subscriptions for Class A, Class B and Class C shares of the fund during a
subscription period that is scheduled to begin on June 1, 2000 and end June
26, 2000 (the "initial offering"). The fund seeks to raise approximately
$750,000,000 during this initial offering period and reserves the right to
withdraw, modify or terminate the initial offering without notice, and to
refuse any order in whole or in part. The fund will close to purchases on June
27, 2000 (the "purchase date") in order to facilitate investment of the
proceeds raised during the initial offering. MFD will pay any dealer firm with
sales of $75 million an additional 1.00% commission on shares of the fund
subscribed for by the dealer firm during the initial offering and sold on the
purchase date. The fund expects to commence its continuous offering of shares
on or about August 1, 2000.
The date of this Supplement is June 1, 2000.