6-K

UNITEDSTATES

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

FORM 6-K****

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

SUN LIFE FINANCIAL INC.

(the "Company")

(Translation of registrant's name into English)

1York Street, 31st Floor, Toronto, Ontario, M5J 0B6

(Address of principal executive offices)

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

SIGNATURE

Pursuant to the requirements 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.

Exhibit 99.1

Sun Life announces Annual Meetings of shareholders and voting policyholders and availability of 2023 Annual Report, 2024 Management Information Circular and 2024 Information for Voting Policyholders' Booklet

TORONTO, March 26, 2024 /CNW/ - Sun Life Financial Inc. (TSX: SLF) (NYSE: SLF) (the "Company") today announced that its Annual Meeting of shareholders and the Annual Meeting of voting policyholders of Sun Life Assurance Company of Canada scheduled for Thursday, May 9, 2024 will be held both via live webcast online and in person. The Company also announced that its 2023 Annual Report and its Notice of Annual Meeting and Management Information Circular for the 2024 annual meeting are now available.

Annual Meetings of Shareholders and Voting Policyholders

Shareholders and voting policyholders will have the opportunity to attend the meeting in person, at the address set out below, or virtually from any location. They will have the opportunity to ask questions and vote on a number of important matters regardless of whether they attend the meeting in person or virtually.

Shareholders and voting policyholders are advised to periodically check the Annual Meetings page on sunlife.com in advance of the meeting for updated information.

For detailed instructions on how to join the webcast and vote at the virtual meeting, shareholders should refer to the 2024 Management Information Circular and voting policyholders should refer to the 2024 Information for Voting Policyholders' Booklet and their proxy form or voting instruction form.

Shareholders and voting policyholders are encouragedto vote in advance by one of the methods described in the 2024 Management Information Circular or 2024 Information for Voting Policyholders' Booklet, as applicable, by Tuesday, May 7, 2024 at 5 p.m. (Toronto time).

If you have any questions, please call our transfer agent, TSX Trust Company at the following numbers:

At the conclusion of the Annual Meeting, Barbara G. Stymiest, CM, FCPA, Corporate Director will retire from the Board of Directors.

Meeting Materials

The meeting materials for Sun Life Financial Inc. have been filed with the Canadian securities regulators and the United States Securities and Exchange Commission. Distribution to shareholders began today and materials can also be accessed electronically on:

SEDAR+ at https://www.sedarplus.caEDGAR at https://www.sec.gov/edgar.shtmlOur transfer agent's website at www.meetingdocuments.com/TSXT/slfOur website at www.sunlife.com/2024agm and www.sunlife.com/AnnualReport

Shareholders may obtain printed copies of the audited annual financial statements free of charge by contacting the Company through its website.

The meeting materials for Sun Life Assurance Company of Canada will begin to be distributed to voting policyholders on April 2, 2024 and can be accessed electronically from April 2, 2024 on:

Our transfer agent's website at https://www.meetingdocuments.com/TSXT/sla/

Our website at www.sunlife.com/2024agm.

2023 Annual Report

The 2023 Annual Report includes the Company's management's discussion and analysis, consolidated financial statements, earnings by business group and other Company information.

As part of our commitment of showcasing diverse voices in our community, our 2023 Annual Report proudly features "Golden Season," by Thanh Chuong. Chuong is a distinguished Vietnamese artist renowned for his fusion of modern art's simplicity and the cultural richness of Vietnamese traditions. His artwork encapsulates a serene moment in the Vietnamese countryside, a reminder of the importance of big and small moments in our lives and the impact we can have on each other and our communities.

2023 Sustainability Report

The Company's 2023 Sustainability Report and Public Accountability Statement were also released today and can be accessed at www.sunlife.com/Sustainability.

About Sun Life

Sun Life is a leading international financial services organization providing asset management, wealth, insurance and health solutions to individual and institutional Clients. Sun Life has operations in a number of markets worldwide, including Canada, the United States, the United Kingdom, Ireland, Hong Kong, the Philippines, Japan, Indonesia, India, China, Australia, Singapore, Vietnam, Malaysia and Bermuda. As of December 31, 2023, Sun Life had total assets under management of $1.40 trillion. For more information, please visit www.sunlife.com.

Sun Life Financial Inc. trades on the Toronto (TSX), New York (NYSE) and Philippine (PSE) stock exchanges under the ticker symbol SLF.

Note to editors: All figures in Canadian dollars

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SOURCE Sun Life Financial Inc.

View original content to download multimedia: http://www.newswire.ca/en/releases/archive/March2024/26/c7607.html

%CIK: 0001097362

CO: Sun Life Financial Inc.

CNW 19:46e 26-MAR-24