Rule 497(d)
FT 421
CALIFORNIA TECHNOLOGY SELECT PORTFOLIO SERIES
Supplement to the Prospectus dated April 6, 2000
Notwithstanding anything to the contrary in the Prospectus, Unit holders who
acquire Units of California Technology Select Portfolio Series, which, as a
result of a reduction in the aggregate underlying value of the Securities, are
not subject to an initial sales charge will be subject to the maximum remaining
deferred sales charge (initially $.225 per Unit). In such case, the maximum
sales charge may exceed 3.25% of the Public Offering Price per Unit for
California Technology Select Portfolio Series, but in no event will the maximum
sales charge exceed 3.75% of the Public Offering Price per Unit for California
Technology Select Portfolio Series.
April 14, 2000
