Constellium (NYSE: CSTM) SVP reports 99,893-share personal holding

Rhea-AI Filing Summary

Constellium SE executive Nicolas Brun, listed as SVP PA, Comm & Sust, has reported his initial beneficial ownership in the company. As of 01/01/2026, he directly holds 99,893 ordinary shares of Constellium SE. The filing shows no derivative securities such as options or warrants. The form is filed for a single reporting person and is signed by an attorney-in-fact on his behalf.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Brun Nicolas

(Last) (First) (Middle)

300 EAST LOMBARD STREET

SUITE 1710

(Street)

BALTIMORE MD 21202

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
01/01/2026

3. Issuer Name and Ticker or Trading Symbol
CONSTELLIUM SE [ CSTM ]

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP PA, Comm & Sust

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary shares	99,893	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Nicolas Brun	01/02/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 5 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What does Constellium SE's latest insider ownership filing show for CSTM?

The filing shows that Nicolas Brun, an officer of Constellium SE, beneficially owns 99,893 ordinary shares of the company.

Who is the reporting person in this Constellium (CSTM) insider filing?

The reporting person is Nicolas Brun, who serves as SVP PA, Comm & Sust at Constellium SE.

How many Constellium SE (CSTM) shares does the executive directly own?

According to the filing, the executive directly owns 99,893 ordinary shares of Constellium SE, reported as Direct (D) ownership.

Does the Constellium SE insider hold any derivative securities?

The Table II section for derivative securities is blank, indicating no reported derivative securities such as options or warrants.

What is the effective date of the insider ownership reported for CSTM?

The date of the event requiring the statement is listed as 01/01/2026, which is the reference date for the reported holdings.

Is this Constellium SE insider filing for one or multiple reporting persons?

The document indicates that the form is filed by one reporting person, not by a group.