Rule 497(d)
FT 421
Supplement to the Prospectus dated April 6, 2000
Sales Charge Discount for Eligible Purchasers
Notwithstanding anything to the contrary in the Prospectus, you can use your
redemption or termination proceeds from any Nike Securities L.P. sponsored
unit investment trust to purchase Units of the Trust in FT 421 during the
initial offering period at the Public Offering Price less 1%. Dealers and
other selling agents will receive a concession or agency commission of 1.75%
of the sales price of Units sold pursuant to this provision.
May 3, 2000
