6-K

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer
Pursuant to Rule 13a-16 or 15d-16
of the Securities Exchange Act of
1934

For the month of May 2007

SUN LIFE FINANCIAL INC.

(the “Company”)

(Translation of registrant’s name into English)

150 King Street West, Toronto, Ontario, M5H 1J9

(Address of principal executive offices)

[Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.]

Form 20-F o Form 40-F þ

[Indicate be check mark whether the registrant by furnishing the information contained in this Form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.]

Yes o No þ

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82-

N/A

Exhibit

99.1 Press release dated May 31, 2007

SIGNATURE

Pursuant to the requirement of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Sun Life Financial Inc.
			(Registrant)
Date: May 31, 2007	By	/s/ “Thomas A. Bogart”
		Thomas A. Bogart,
		Executive Vice-President & General Counsel

EX-99.1

Sun Life Financial Completes Acquisition of Genworth’s
Employee Benefits Group

Toronto, ON (May 31, 2007) — Sun Life Financial Inc. (TSX/NYSE: SLF) today announced the completion of its acquisition of Genworth Financial, Inc.’s U.S. Employee Benefits Group following approval by all required regulatory authorities in the United States and the Office of the Superintendent of Financial Institutions in Canada. Sun Life’s U.S. group business, combined with Genworth’s Employee Benefits Group, becomes Sun Life Financial Employee Benefits Group, offering customers group life, disability, dental and stop-loss insurance.

“This strategic acquisition significantly strengthens the position of Sun Life in the U.S. and solidifies our top ten leadership position in the important U.S. employee benefits industry,” said Donald A. Stewart, Chief Executive Officer, Sun Life Financial.

The acquired business complements Sun Life’s group business platform and increases the company’s market share across its U.S. group lines of business. Bringing together the two organizations’ market presence and distribution relationships, Sun Life Financial Employee Benefits Group will expand to 34 sales offices across the country.

“This acquisition increases Sun Life’s access to markets, broadens our product and service offerings, and strengthens our distribution platform,” said Bob Salipante, President, Sun Life Financial U.S. “Leveraging Sun Life’s North American resources and multi-site international operating platform, the new organization is poised for long term growth.”

About Sun Life Financial
Sun Life Financial is a leading international financial services organization providing a diverse range of protection and wealth accumulation products and services to individuals and corporate customers. Chartered in 1865, Sun Life Financial and its partners today have operations in key markets worldwide, including Canada, the United States, the United Kingdom, Ireland, Hong Kong, the Philippines, Japan, Indonesia, India, China and Bermuda. As of March 31, 2007, the Sun Life Financial group of companies had total assets under management of CDN$446 billion. Sun Life Financial Inc. trades on the Toronto (TSX), New York (NYSE) and Philippine (PSE) stock exchanges under ticker symbol SLF.

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Media Relations Contact:	Investor Relations Contact:
Susan Jantzi	Kevin Strain
Senior Manager	Vice-President
External Communications & Corporate Affairs	Investor Relations
Tel: 519-888-3160	416-204-8163
susan.jantzi@sunlife.com	investor.relations@sunlife.com