Constellium SE (CSTM) EVP & CFO Jack Guo discloses 73,792 shares

Rhea-AI Filing Summary

Constellium SE executive Jack Guo, serving as EVP & CFO, reported his initial ownership of company stock. As of the event date of 01/01/2026, he beneficially owns 73,792 ordinary shares of Constellium SE, all held in a direct ownership capacity. This filing is a routine disclosure required for insiders to report their holdings when they become officers or otherwise subject to reporting rules.

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^*

Guo Jack Q.

(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)
	EVP & CFO

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	73,792	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 Jack Guo	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 insider ownership did Constellium SE (CSTM) disclose in this Form 3?

The filing shows that EVP & CFO Jack Guo beneficially owns 73,792 ordinary shares of Constellium SE in direct ownership.

What is Jack Guos role at Constellium SE (CSTM)?

Jack Guo is identified in the filing as an Officer of Constellium SE, with the title EVP & CFO.

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

The date of the event requiring this statement of beneficial ownership is listed as 01/01/2026.

Does the Constellium SE (CSTM) Form 3 show any derivative securities?

Table II for derivative securities is present but contains no listed derivative positions for Jack Guo in this filing.

Is this Constellium SE (CSTM) Form 3 filed by more than one reporting person?

No. The form indicates it is filed by one reporting person, covering only Jack Guo.

How are the Constellium SE (CSTM) shares held by Jack Guo classified?

The filing classifies the 73,792 ordinary shares as held under Direct (D) ownership.