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.

Indicate by check mark if the registrant is submitting the Form 6-K  in paper as permitted by Regulation S-T Rule 101(b)(1):____

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):____

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 virtual Annual Meetings of shareholders and voting policyholders and availability of 2019 Annual Report, 2020 Management Information Circular and 2020 Information for Voting Policyholders' Booklet

Sun Life also releasesits 2019 Sustainability Report and 2019 Public Accountability Statement

TORONTO, March 26, 2020 /CNW/ - Sun Life Financial Inc. (TSX: SLF) (NYSE: SLF) today announced that its Annual Meeting of shareholders and the Annual Meeting of voting policyholders of Sun Life Assurance Company of Canada scheduled for Tuesday, May 5, 2020 will be held in a virtual-only format. The Company also announced that its 2019 Annual Report and its Notice of Annual Meeting and Management Information Circular are now available.

Virtual Annual Meetings of Shareholdersand Voting PolicyholdersAt Sun Life, we're in the business of helping our Clients achieve lifetime financial security and live healthier lives. We have been actively monitoring COVID-19 developments and the directives provided by Government officials and public health authorities.

The health and well-being of our employees, Clients, investors and communities is our top priority. Sun Life is doing its part to help contain the spread of the COVID-19 virus. In line with the latest directives and guidance from public health authorities and the Provincial and Federal Governments, this year's annual meetings will be held as a live webcast only. Shareholders and voting policyholders will have the opportunity to attend the meeting online in real time regardless of their location, submit questions and vote on a number of important matters. Shareholders, voting policyholders, investors or members of the public will not be able to attend the meeting in person.

Sun Life's virtual Annual Meeting will be held Tuesday, May 5, 2020 at 5 p.m. (Toronto time) by live webcast at https://web.lumiagm.com/186947015 using the password sunlife2020. For detailed instructions on how to join the webcast and vote at the virtual meeting, shareholders should refer to the 2020 Management Information Circular and voting policyholders should refer to the Information for Voting Policyholders' Booklet and their proxy form or voting instruction form.

Shareholders and voting policyholders areencouraged to vote in advance by one of the methods described in the 2020 Management Information Circular or Information for VotingPolicyholders' Booklet, as applicable. Registered shareholders are asked to return their completed proxies or exercise their voteby the voting deadline, Friday, May 1, 2020 at 5 p.m. (Toronto time).  Voting policyholders are asked to return their proxiesno later than 5 p.m. (Toronto time) on April 28, 2020.

If you have any questions, please call our transfer agent, AST Trust Company (Canada) at the following numbers:

Meeting MaterialsThe 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 they can also be accessed electronically on:

SEDAR at https://www.sedar.com

EDGAR at https://www.sec.gov/edgar.shtmlOur transfer agent's website at https://www.meetingdocuments.com/astca/slf

Our website at www.sunlife.com/2019AnnualReport and www.sunlife.com/AnnualMeetingMaterials.

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

The 2019 Annual Report includes the Company's management's discussion and analysis, consolidated financial statements, earnings by business group and other Company information.

The meeting materials for Sun Life Assurance Company of Canada can be accessed electronically on:

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

Our website at www.sunlife.com/2019AnnualReport and www.sunlife.com/AnnualMeetingMaterials.

2019 Sustainability ReportThe Company's 2019 Sustainability Report and Public Accountability Statement were also released today and can be accessed at www.sunlife.com/Sustainability. The report highlights Sun Life's achievements and efforts to create a more sustainable world while delivering for Clients, employees and communities.  In addition, it outlines Sun Life's new sustainability plan, which focuses on three key areas where Sun Life has the greatest opportunity to drive meaningful change: increasing financial security, fostering healthier lives, and advancing sustainable investing. This is underlined by Sun Life's continued commitment to be a trusted and responsible business.

About Sun LifeSun Life is a leading international financial services organization providing insurance, wealth and asset management solutions to individual and corporate 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, 2019, Sun Life had total assets under management of C$1,099 billion. 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.

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SOURCE Sun Life Financial Inc.

View original content to download multimedia: http://www.newswire.ca/en/releases/archive/March2020/26/c9187.html

%CIK: 0001097362

CO: Sun Life Financial Inc.

CNW 18:54e 26-MAR-20