Company: SLFQF
Filing Date: 2025-02-13
Form Type: S-8
Source: 0001193125-25-026100
Chunk: 0

Company: SUN LIFE FINANCIAL INC
Filing Date: 2025-02-13
Form: S-8
Chunk 0
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As filed with the Securities and Exchange Commission on February 13, 2025 Registration No. 333-______ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 SUN LIFE FINANCIAL INC. (Exact Name of Registrant as Specified in Its Charter)

| Canada                          |     | Not Applicable    |
| (State or Other Jurisdiction of 
 Incorporation or Organization)  |     | -I.R.S. Employer  
 Identification No |

1 York Street, 31st Floor Toronto, Ontario, Canada M5J 0B6 (Address, Including Zip Code of Principal Executive Offices) Sun Life Financial (U.S.) Services Company, Inc. Employee Stock Purchase Plan Sun Life Investments LLC Employee Stock Purchase Plan (Full title of Plans) Sun Life Assurance Company of Canada - U.S. Operations Holdings, Inc. One Sun Life Executive Park Wellesley Hills, Massachusetts 02481 (781) 247-6030 (Name, address and telephone number, including area code, of agent for service) Copies to:

| Leslie Nash                                     
 Sun Life Financial US 96                        
 Worcester Street Wellesley, Massachusetts 02481 
 (781) 416-2161                                  |     | Tracie Allan                                
 Sun Life Financial 1 York                   
 Street, 31st Floor Toronto, Ontario, Canada 
 M5J 0B6 (647) 256-2502                      |     | Christopher R. Bornhorst, Esq. 
 Ellie Kang, Esq. Torys         
 LLP 1114 Avenue of the         
 Americas, 23rd Floor New       
 York, NY 10036 (212) 880-6000  |     | Rima Ramchandani                          
 Jennifer Lennon Torys                     
 LLP 79 Wellington Street West, Suite 3000 
 Toronto, Ontario, Canada                  
 M5K 1N2 (416) 865-0040                    |

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-acceleratedfiler, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2of the Exchange Act.

| Large accelerated filer |     | ☒ |     | Accelerated fil