6-K

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 December 2020

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

Attached hereto as Exhibit 99.1 is a copy of a press release issued by Constellium SE dated December 22, 2020.

Exhibit Index

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.

EX-99.1

Exhibit 99.1

Constellium Appoints Jean-Christophe Deslarzes as Advisor to the Board of Directors

Paris, December 22, 2020 - Constellium SE (NYSE: CSTM) today announced that Mr. Jean-Christophe Deslarzes will be appointed as a Special Advisor to the Board of Directors in January 2021. The Board expects to put forward the nomination of Mr. Deslarzes as a Non-Executive Director at the Company’s Annual General Meeting to be held in 2021.

Jean-Christophe Deslarzes has been a member of the Board of Directors of The Adecco Group since April 2015 and Chairman of the Board since April 2020. Mr. Deslarzes has also been Chairman of the Board of Directors of ABB India Limited since February 2018.

Mr. Deslarzes began his career in 1991 as a tax and legal consultant at Arthur Andersen in Switzerland. From 1994 to 2010, he worked at Rio Tinto and its predecessor companies, Alcan and Alusuisse, in human resources and general management roles in Europe and Canada, including as Senior Vice President Human Resources and member of the Executive Committee of Alcan Group as well as President and CEO, Downstream Aluminium Businesses, Rio Tinto, based in Canada. He served as Chief Human Resources and Organization Officer and member of the Executive Board at Carrefour Group, based in France, from 2010 to 2013 and most recently as Chief Human Resources Officer and member of the Executive Committee of ABB Group, based in Zurich, Switzerland, from 2013 to 2019.

A Swiss national, Jean-Christophe Deslarzes holds a master’s degree in Law from the University of Fribourg, Switzerland.

Constellium (NYSE: CSTM) is a global sector leader that develops innovative, value added aluminium products for a broad scope of markets and applications, including aerospace, automotive and packaging. Constellium generated €5.9 billion of revenue in 2019.