Constellium SE (CSTM) officer Form 3 reports no share ownership

Rhea-AI Filing Summary

Constellium SE filed an initial insider ownership report for a senior executive. The Form 3 identifies an officer serving as President, P&ARP, with the reporting date of the ownership event on 01/01/2026. According to the filing, this reporting person currently holds 0 ordinary shares of Constellium SE directly and reports no derivative securities such as options or warrants. The form is filed for one reporting person and is signed by an attorney-in-fact on 01/02/2026, formally establishing this insider’s baseline ownership position with the company.

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^*

Perkins Matthew B.

(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)
	President, P&ARP

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	0	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 Matthew Perkins	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 Form 3 filed for 01/01/2026 show about insider ownership?

The Form 3 shows that the reporting person, an officer of Constellium SE (CSTM), reports beneficial ownership of 0 ordinary shares as of the event date 01/01/2026.

Who is the reporting person related to Constellium SE (CSTM) in this Form 3 filing?

The reporting person is an officer of Constellium SE with the title President, P&ARP, as disclosed in the relationship section of the filing.

Does the Constellium SE Form 3 report any derivative securities for the insider?

No derivative securities are listed in Table II of the Form 3 for this reporting person, indicating no reported options, warrants, or other convertible securities tied to Constellium SE at that time.

Is this Constellium SE Form 3 filed by one or multiple reporting persons?

The filing indicates that it is a Form filed by One Reporting Person, not a joint or group filing.

When was the Constellium SE insider ownership event and when was the Form 3 signed?

The date of the event requiring the statement is 01/01/2026, and the Form 3 is signed on 01/02/2026 by /s/ Kristine Carpenter as attorney-in-fact for the reporting person.

What type of security is covered in this Constellium SE (CSTM) Form 3?

The Form 3 covers ordinary shares of Constellium SE in Table I, with the amount of securities beneficially owned reported as 0.