X0508 4 2026-02-20 0 0001563411 CONSTELLIUM SE CSTM 0002092960 Becker Marcus 300 EAST LOMBARD STREET SUITE 1710 BALTIMORE MD 21202 0 1 0 0 SVP CPO 0 Ordinary shares 2026-02-20 4 S 0 15570 25.5793 D 0 D The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.5793 to $25.5793, inclusive. The reporting person undertakes to provide to Constellium SE, any security holder of Constellium SE, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth herein. /s/ Kristine Carpenter, Attorney-in-Fact for Marcus Becker 2026-02-24