Stephen Charles Walters - 23 Feb 2026 Form 4 Insider Report for CONSTELLIUM SE (CSTM)

Role: SVP GC & Secretary
Signature: /s/ Kristine Carpenter, Attorney-in-Fact for Stephen Walters
Issuer symbol: CSTM
Transactions as of: 23 Feb 2026
Net transactions value: -$38,085
Form type: 4
Filing time: 24 Feb 2026, 08:46:19 UTC
Previous filing: 11 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Walters Stephen Charles	SVP GC & Secretary	300 EAST LOMBARD STREET, SUITE 1710, BALTIMORE	/s/ Kristine Carpenter, Attorney-in-Fact for Stephen Walters	24 Feb 2026	0002096129

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CSTM	Ordinary shares	Sale	$38,085	-1,500	-100%	$25.39	0	23 Feb 2026	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.39 to $25.39, 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.

Content

The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.39 to $25.39, 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.