Company: SLFQF
Filing Date: 2025-05-09
Form Type: 6-K
Source: 0001097362-25-000018
Chunk: 0

Company: SUN LIFE FINANCIAL INC
Filing Date: 2025-05-09
Form: 6-K
Chunk 0
---
### UNITED STATES

### SECURITIES AND EXCHANGE COMMISSION

#### Washington, D.C. 20549

#### FORM 6-K

#### Report of Foreign Private Issuer

#### Pursuant to Rule 13a-16 or 15d-16

#### under the Securities Exchange Act of

#### 1934

#### For the month of May, 2025
Commission File Number:

#### 001-15014

### SUN LIFE FINANCIAL INC.
<div align='center'>(Translation of registrant’s name into English)</div>

#### 1 York Street, 31

#### st

#### Floor, Toronto, Ontario M5J 0B6
<div align='center'>(Address of principal executive offices)</div>

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 Form 40-F

#### X
Exhibit

99.1 Shareholders’ Report

99.2 Certificates of the Chief Executive Officer and Chief Financial Officer pursuant to Canadian National Instrument 52-109 - Certification of Disclosure in Issuers’ Annual and Interim Filings

99.3 Earnings Coverage Ratio pursuant to Canadian National Instrument 44-102 - Shelf Distributions

### 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 8, 2025 By /s/ “Tracie Allan”

Tracie Allan

VP, Associated General Counsel, Corporate Legal

#### Exhibit 99.1

#### Exhibit 99.2

#### Exhibit 99.3