Constellium SE

Constellium SE, a Societas Europaea ( SE ) incorporated under the law of France with its head office located at Washington Plaza 40-44 rue Washington, Paris, France, is the parent company of the Group. Unless the context indicates otherwise, when we refer to we, our, us, Constellium, the Group and the Company in this document, we are referring to Constellium SE and its subsidiaries. On June 30, 2025, the Company determined it no longer qualified as a foreign private issuer . As from January 1, 2026, when its earlier submission to the US securities law requirements applicable to a domestic issuer ceased to be voluntary, the Company will continue to file annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and comply with all other obligations applicable to companies not qualifying as foreign private issuers as set forth by the New York Stock Exchange ( NYSE ) and the Securities and Exchange Commission ( SEC ). The Group’s U.S. assets are held by Constellium US Holdings I, LLC, a wholly owned subsidiary of Constellium SE. The I.R.S. Employer Identification Number of Constellium US Holdings I, LLC is: 27-4126819. Overview We are a global leader in the development, manufacture and sale of a broad range of high value-added specialty rolled and extruded aluminum products to the aerospace, space, defense, packaging, automotive, commercial transportation and general industrial end-markets.