Constellium SE 6-K, filed Mar 16, 2021

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OFFOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of March 2021

Commission File Number: 001-35931

Constellium SE

(Translation of registrant’s name into English)

WashingtonPlaza

40-44, rue Washington

75008 Paris, France

(Address of principal executive office)

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

On March 11, 2021, Guy Maugis, a member of the Board of Directors of Constellium SE (the “Company”), notified the Company of his intention to resign from the Company’s Board of Directors, effective March 16, 2021, to focus on his other responsibilities and directorships. Mr. Maugis’ resignation is not a result of any disagreement with the Company.

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

SIGNATURE

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.