Martha Brooks - 01 Jan 2026 Form 3 Insider Report for CONSTELLIUM SE (CSTM)

Reporting relationship: Director
Issuer ticker: CSTM
Reported as of: 01 Jan 2026
Net transaction value: $0
SEC form: 3
Accepted by SEC: 02 Jan 2026, 10:44:02 UTC
Prior SEC filing: 26 Jan 2023
Source filing: View source filing
Reporting owner signature: /s/ Kristine Carpenter, Attorney-in-Fact for Martha Brooks

Key filing fact

Martha Brooks filed Form 3 for CONSTELLIUM SE (CSTM) on 02 Jan 2026.

Key facts

This page summarizes Martha Brooks's Form 3 filing for CONSTELLIUM SE (CSTM).
0 reported transactions and 0 derivative rows are listed below.
Accepted by SEC: 02 Jan 2026, 10:44.

Change

Previous filing in this sequence was filed on 26 Jan 2023.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Official SEC source

Ownership activity is grounded in SEC Form 3 disclosures.

View source filing

Reporting Owners (1)

CIK 0001269707 Primary reporting owner

BROOKS MARTHA

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

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

CSTM holding

Ordinary shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 97,741
Date: 01 Jan 2026
Ownership: Direct

CSTM holding

Ordinary shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 22,000
Date: 01 Jan 2026
Ownership: By spouse

CSTM holding

Ordinary shares

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 92,000
Date: 01 Jan 2026
Ownership: Family limited partnership
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote 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.