SUPPLEMENT DATED AUGUST 19, 2013

TO PROSPECTUS DATED APRIL 30, 2010

FOR PREFERRED ADVISOR

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

KMA VARIABLE ACCOUNT

Effective August 2, 2013, the parent of Sun Life Assurance Company of Canada (U.S.) is Delaware Life Holdings, LLC (“Delaware Life”).  Delaware Life is a limited liability company formed under the laws of Delaware on December 12, 2012.  Delaware Life is ultimately controlled by Todd L. Boehly and Mark R. Walter.

THIS SUPPLEMENT SHOULD BE READ AND RETAINED FOR FUTURE REFERENCE.

Preferred Advisor 8/2013