<PAGE>
Rule 424(b)(3)
File No. 333-77041
CALIFORNIA ONLY
SUPPLEMENT DATED OCTOBER 8, 1999 TO PROSPECTUS DATED MAY 1, 1999
MFS REGATTA PLATINUM
COMBINATION FIXED AND VARIABLE ANNUITY
ISSUED BY SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)
Effective October 8, 1999, no Market Value Adjustment will apply to MFS
Regatta Platinum Annuity Contracts issued in the state of California on or after
that date.
THIS SUPPLEMENT IS NOT VALID UNLESS ACCOMPANIED OR PRECEDED BY THE CURRENT
PROSPECTUS FOR THE MFS REGATTA PLATINUM FIXED AND VARIABLE ANNUITY, DATED
MAY 1, 1999 AND SUPPLEMENTED SEPTEMBER 13, 1999, AND THE MFS/SUN LIFE SERIES
TRUST PROSPECTUS DATED MAY 1, 1999. ALL PROSPECTUSES AND SUPPLEMENTS SHOULD
BE READ AND RETAINED FOR FUTURE REFERENCE.
CA SUPP 10/99
<PAGE>
Rule 424(b)(3)
File No. 333-77041
CALIFORNIA, MARYLAND, AND TEXAS ONLY
SUPPLEMENT DATED OCTOBER 8, 1999 TO PROSPECTUS DATED MAY 1, 1999
MFS REGATTA GOLD
VARIABLE AND FIXED ANNUITY
ISSUED BY SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)
For all MFS Regatta Gold Variable and Fixed Annuity Contracts issued in
California, Maryland, or Texas, on or after October 8, 1999, the following
modifications are made to the Profile and the Prospectus for the MFS Regatta
Gold Variable and Fixed Annuity, both dated May 1, 1999, and supplemented
September 13, 1999:
1. The first sentence in Section 3, "Purchasing a Contract" of the Profile is
amended by deleting the sentence in its entirety and replacing it with the
following sentence:
"You may purchase a Contract for $10,000 or more, under most
circumstances."
2. The first sentence under the sub-heading "Amount and Frequency of Purchase
Payments" on page 12 of the Prospectus is amended by deleting the sentence
in its entirety and replacing it with the following sentence:
"The amount of Purchase Payments may vary; however, we will not
accept an initial Purchase Payment of less than $10,000, and each
additional Purchase Payment must be at least $1,000, unless we
waive these limits.
THIS SUPPLEMENT IS NOT VALID UNLESS ACCOMPANIED OR PRECEDED BY THE CURRENT
PROSPECTUS OF MFS REGATTA GOLD VARIABLE AND FIXED ANNUITY, DATED MAY 1, 1999
AND SUPPLEMENTED SEPTEMBER 13, 1999, AND THE MFS/SUN LIFE SERIES TRUST
PROSPECTUS DATED MAY 1, 1999. ALL PROSPECTUSES AND SUPPLEMENTS SHOULD BE READ
AND RETAINED FOR FUTURE REFERENCE.
GOLDSUPP-CA/MD/TX-10/99
<PAGE>
Rule 424(b)(3)
File No. 333-77041
CALIFORNIA ONLY
SUPPLEMENT DATED OCTOBER 8, 1999 TO PROSPECTUS DATED MAY 1, 1999
FUTURITY II
VARIABLE AND FIXED ANNUITY
ISSUED BY SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)
Effective October 8, 1999, no Market Value Adjustment will apply to
Futurity II Annuity Contracts issued in the state of California on or after that
date.
THIS SUPPLEMENT IS NOT VALID UNLESS ACCOMPANIED OR PRECEDED BY THE CURRENT
PROSPECTUS FOR FUTURITY ANNUITY, DATED MAY 1, 1999 AND SUPPLEMENTED
SEPTEMBER 13, 1999. THIS SUPPLEMENT SHOULD BE READ TOGETHER WITH THE CURRENT
FUTURITY II ANNUITY PROSPECTUS, ALL OF ITS SUPPLEMENTS, AND THE PROSPECTUSES
FOR THE UNDERLYING MUTUAL FUNDS. ALL PROSPECTUSES AND SUPPLEMENTS SHOULD BE
RETAINED FOR FUTURE REFERENCE.
FUT 199B
