MARTHA BROOKS - 01 Jan 2026 Form 3 Insider Report for CONSTELLIUM SE (CSTM)

Role: Director
Signature: /s/ Kristine Carpenter, Attorney-in-Fact for Martha Brooks
Issuer symbol: CSTM
Transactions as of: 01 Jan 2026
Net transactions value: $0
Form type: 3
Filing time: 02 Jan 2026, 10:44:02 UTC
Previous filing: 26 Jan 2023
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
BROOKS MARTHA	Director	300 EAST LOMBARD STREET, SUITE 1710, BALTIMORE	/s/ Kristine Carpenter, Attorney-in-Fact for Martha Brooks	02 Jan 2026	0001269707

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	CSTM	Ordinary shares						97,741	01 Jan 2026	Direct
holding	CSTM	Ordinary shares						22,000	01 Jan 2026	By spouse
holding	CSTM	Ordinary shares						92,000	01 Jan 2026	Family limited partnership	F1

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

Explanation of Responses:

Id	Content
F1	The Reporting Person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16.