SUPPLEMENT DATED AUGUST 19, 2013

to

PROSPECTUSES DATED APRIL 29, 2013

FOR COMPASS 2 AND COMPASS 3

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

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

1. 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.

2. Pursuant to the approval by the Board of Trustees of the MFS Total Return Portfolio (“the Fund”) and its shareholders, the Fund was reorganized into the MFS Total Return Series, effective at close of business on August 16, 2013.

MFS Total Return Portfolio is no longer available for investment and all references to the Fund are hereby deleted from the prospectus.

THIS SUPPLEMENT SHOULD BE READ AND RETAINED FOR FUTURE REFERENCE.

Compass 2 and Compass 3 US                                                                                                                                          8/2013

SUPPLEMENT DATED AUGUST 19, 2013

to

STATEMENTS OF ADDITIONAL INFORMATION DATED APRIL 29, 2013

FOR COMPASS 2 AND COMPASS 3

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

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

The text under the heading “The Company” in the Statement of Additional Information is replaced with the following:

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. Messrs. Boehly and Walter ultimately control the Company through the following intervening companies:  Delaware Life, Delaware Life Holdings Parent, LLC, Delaware Life Holdings Parent II, LLC, Delaware Life Equity Investors, LLC, DLICM, LLC and DLICT, LLC. The nature of the business of Messrs. Boehly and Walter and these intervening companies is investing in companies engaged in the business of life insurance and annuities.

THIS SUPPLEMENT SHOULD BE READ AND RETAINED FOR FUTURE REFERENCE.

Compass 2 and Compass 3 SAIs (US)                                                                                                                                          6/2013