Gildan Activewear Inc.

Foreign Filer Report • Dec 16, 2025

6-K 1 tm2533121-2_6k.htm 6-K tm2533121-2_6k - none - 1.7031492s

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549

FORM 6-K

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

For the month of: December 2025 Commission File Number: 1-14830

GILDAN ACTIVEWEAR INC.

(Translation of registrant’s name into English)

600 de Maisonneuve Boulevard West 33rd Floor Montréal, Québec Canada H3A 3J2

(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:

Form 20-F ☐ Form 40-F ☒

SIGNATURES

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.

​	​	​	​	GILDAN ACTIVEWEAR INC.				​
​	Date: December 15, 2025	​	​	By:	​	​	/s/ Isabelle Papillon ​ Name: Isabelle Papillon Title:  Corporate Secretary	​

EXHIBIT INDEX

Exhibit	​	​	Description of Exhibit	​
99.1	​	​	Business Acquisition Report, dated December 15, 2025	​