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 x FORM 40-F o On March 25, 2025, Amer Sports, Inc. (the “Company”) issued its annual report for the year ended December 31, 2024. A copy of the Company’s annual report is furnished as Exhibit 99.1 to this Report of Foreign Private Issuer on Form 6-K.

The information contained in this Report on Form 6-K (including Exhibit 99.1) shall not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference into any of the Company’s filing under the Securities Act of 1933, as amended, or the Exchange Act.

The following exhibit is furnished as part of this Report on Form 6-K:

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 hereunder.

Date: March 25, 2025