SUPPLEMENT DATED AUGUST 17, 2012

TO

PROSPECTUSES DATED MAY 1, 2012 FOR

MFS REGATTA CHOICE, MFS REGATTA GOLD, MFS REGATTA PLATINUM,

SUN LIFE FINANCIAL MASTERS FLEX, SUN LIFE FINANCIAL MASTERS EXTRA,

AND SUN LIFE FINANCIAL MASTERS CHOICE

PROSPECTUS DATED APRIL 29, 2011 FOR

SUN LIFE FINANCIAL MASTERS ACCESS

PROSPECTUS DATED MAY 1, 2008 FOR

MFS REGATTA EXTRA

PROSPECTUSES DATED MAY 1, 2007 FOR

MFS REGATTA CHOICE II AND MFS REGATTA FLEX II

PROSPECTUS DATED JULY 18, 2006 FOR

MFS REGATTA CLASSIC

AND PROSPECTUSES DATED MAY 1, 2006 FOR

MFS REGATTA FLEX FOUR AND MFS REGATTA ACCESS

ISSUED BY SUN LIFE ASSURANCE COMPANY OF CANADA (U.S.)

SUN LIFE OF CANADA (U.S.) VARIABLE ACCOUNT F

On August 9, 2012, shareholders approved the reorganization of the MFS Growth Portfolio (“Growth Portfolio”) into the MFS Growth Series (“Growth Series”) and the Mid Cap Growth Portfolio (“Mid Cap Growth Portfolio”) into the MFS Mid Cap Growth Series (“Mid Cap Growth Series”).  After the close of business on August 17, 2012, all of the assets of the Growth Portfolio will be transferred to the Growth Series and shareholders of the Growth Portfolio will receive shares of the Growth Series in exchange for their Growth Portfolio shares. And, all of the assets of the Mid Cap Growth Portfolio will be transferred to the Mid Cap Growth Series and shareholders of the Mid Cap Growth Portfolio will receive shares of the Mid Cap Growth Series in exchange for their Mid Cap Growth Portfolio shares.  The Growth Portfolio and the Mid Cap Growth Portfolio are no longer available investment options and all references to those Portfolios are deleted from the prospectus.

Please retain this supplement with your prospectus for future reference.