<PAGE>
MFS GLOBAL TELECOMMUNICATIONS FUND
SUPPLEMENT TO PROSPECTUS DATED JUNE 1, 2000
The description of how to purchase shares under the "How to Purchase, Exchange
and Redeem Shares" section is hereby supplemented as follows:
Initial Offering
For the period from June 1, 2000 through June 26, 2000, the fund's distributor,
MFS Fund Distributors, Inc. will be soliciting subscriptions for Class A, Class
B and Class C shares of the fund. In order to facilitate investment of the
proceeds raised during the initial offering period, the fund will close to
purchases on June 27, 2000. The fund expects to commence its continuous offering
of shares on or about August 1, 2000. During the period when the fund is closed
to purchases, shareholders may redeem existing positions, but the fund will be
closed to any new purchases.
The minimum subscription amount is $1,000. The fund's transfer agent, MFS
Service Center, Inc. ("MFSC"), will accept checks accompanying applications for
the purchase of shares of the fund received on June 27, 2000. Checks received
prior to June 27, 2000 may be returned by MFSC. In addition, exchange orders
from another fund in the MFS Family of Funds will also be accepted on June 27,
2000; exchange orders received prior to that date will be rejected. Shares
subscribed for during the initial offering period will be sold to subscribers on
the purchase date, which is expected to occur not later than June 27, 2000.
The date of this Supplement is June 20, 2000