144 0002093449 XXXXXXXX LIVE 0001563411 Constellium SE 001-35931 300 E Lombard Street suite 1710 Baltimore MD 21202 4124033233 Philippe Hoffmann affiliate Class A Common Stock J.P. Morgan Securities LLC

270 Park Ave 10th Floor New York NY 10017

80000 2115512.55 137801779 03/04/2026 NYSE Class A Common Stock 05/25/2021 RSU Issuance Constellium SE (issuer) N 11246 03/05/2026 Equity Compensation Class A Common Stock 05/25/2021 PSU Issuance Constellium SE (issuer) N 6212 03/05/2026 Equity Compensation Class A Common Stock 04/01/2022 RSU Issuance Constellium SE (issuer) N 13340 03/05/2026 Equity Compensation Class A Common Stock 04/01/2022 PSU Issuance Constellium SE (issuer) N 8162 03/05/2026 Equity Compensation Class A Common Stock 04/07/2023 RSU Issuance Constellium SE (issuer) N 7755 03/05/2026 Equity Compensation Class A Common Stock 04/07/2023 PSU Issuance Constellium SE (issuer) N 23426 03/05/2026 Equity Compensation Class A Common Stock 05/11/2024 RSU Issuance Constellium SE (issuer) N 14833 03/05/2026 Equity Compensation Class A Common Stock 05/11/2024 PSU Issuance Constellium SE (issuer) N 19314 03/05/2026 Equity Compensation Class A Common Stock 03/10/2025 RSU Issuance Constellium SE (issuer) N 14231 03/05/2026 Equity Compensation Class A Common Stock 03/10/2025 PSU Issuance Constellium SE (issuer) N 16906 03/05/2026 Equity Compensation Y 03/04/2026 J.P. Morgan Securities LLC, Workplace Solutions, as Agent and Attorney in Fact for Philippe Hoffmann, Constellium SE