Company: SLFQF
Filing Date: 2025-02-13
Form Type: S-8
Source: 0001193125-25-026100
Chunk: 1

Company: SUN LIFE FINANCIAL INC
Filing Date: 2025-02-13
Form: S-8
Chunk 1
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er         |     | ☐ |
| Non-accelerated filer   |     | ☐ |     | Smaller reporting company |     | ☐ |
|                         |     |   |     | Emerging growth company   |     | ☐ |

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act ☐

EXPLANATORY NOTE This registration statement on Form S-8(the “Registration Statement”) is being filed for the purpose of registering 1,000,000 common shares, without par value (the “Common Shares”), of Sun Life Financial Inc. (the “Registrant”), which may be offered pursuant to awards under the Sun Life Financial (U.S.) Services Company, Inc. Employee Stock Purchase Plan and the Sun Life Investments LLC Employee Stock Purchase Plan. PART I INFORMATION REQUIRED IN THE SECTION 10(A) PROSPECTUS The documents containing the information specified in Item 1 and Item 2 of Part I of Form S-8will be delivered to participants as specified by Rule 428(b)(1) under the Securities Act. In accordance with the rules and regulations of the Securities and Exchange Commission (the “Commission”) and the instructions to Form S-8,such documents are not being filed with the Commission either as part of this Registration Statement or as prospectuses or prospectus supplements pursuant to Rule 424 under the Securities Act. PART II INFORMATION REQUIRED IN THE REGISTRATION STATEMENT Item 3. Incorporation of Documents by Reference. The following documents, which have heretofore been filed by the Registrant with the Commission pursuant to the Securities Exchange Act of 1934, as amended (the “Exchange Act”), are incorporated by reference herein and shall be deemed to be a part hereof:

| (a) | Exhibits                                                                                                                                                                                     
 99.1 to 99.3 of the                                                                                                                                                                          
 Registrant’s annual report on Form 40-F (File No. 001-15014) (the “Annual Report on Form 40-F”) filed with the Commission on February 12, 2025, including the Registrant’s audited financial 
 statements for the fiscal year ended December 31, 2024;                                                                                                                                      |

| (c) | the description of the Registrant’s Common Shares, under the section captioned “Capital                                                                                                                  
 Structure” in