Jack Q. Guo - 01 Jan 2026 Form 3/A - Amendment Insider Report for CONSTELLIUM SE (CSTM)

Role: EVP & CFO
Signature: /s/ Kristine Carpenter, Attorney-in-Fact for Jack Guo
Issuer symbol: CSTM
Transactions as of: 01 Jan 2026
Net transactions value: $0
Form type: 3/A - Amendment
Filing time: 11 Mar 2026, 06:16:11 UTC
Date Of Original Report: 02 Jan 2026
Next filing: 11 Mar 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Guo Jack Q.	EVP & CFO	300 EAST LOMBARD STREET, SUITE 1710, BALTIMORE	/s/ Kristine Carpenter, Attorney-in-Fact for Jack Guo	11 Mar 2026	0002095182

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
holding	CSTM	Ordinary shares						156,722	01 Jan 2026	Direct	F1

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

Explanation of Responses:

Id	Content
F1	Amount consists of (i) 73,792 ordinary shares held by the Reporting Person as of January 1, 2026 and (ii) an aggregate of 82,930 restricted stock units which remain subject to vesting restrictions and which were inadvertently omitted from the Reporting Person's original Form 3 filing.