CSTM Constellium SE

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 June 2022

Commission File Number: 001-35931

(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  ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):    Yes  ☐    No  ☒

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):    Yes  ☐    No  ☒

INFORMATION CONTAINED IN THIS FORM 6-K REPORT

Constellium SE (the “Company”) posted voting results for matters submitted at its Annual Ordinary General Meeting of Shareholders held on June 10, 2022 (the “AGM”). The voting results are posted on the Company’s website and are attached and incorporated herein by reference as Exhibit 99.1.

The Company also issued a press release, attached hereto as Exhibit 99.2, announcing the appointment and re-appointment of certain directors, and listing all of the members of the Company’s Board of Directors following the AGM.

The information contained in this Form 6-K is incorporated by reference into any offering circular or registration statement (or into any prospectus that forms a part thereof) filed by Constellium SE with the Securities and Exchange Commission.