Constellium CFO granted 19,690 restricted shares

Guo Jack Q. reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Guo Jack Q. reported acquisition or exercise transactions in this Form 4 filing.

Constellium SE EVP & CFO Jack Q. Guo received a grant of 19,690 ordinary shares in the form of restricted stock units, with no purchase price.

Following this award, he directly holds 210,569 ordinary shares. The RSUs vest in full on March 12, 2029, subject to continued employment.

Insider Trade Summary

Grant/Award: 19,690 shares

Grant/Award 1 txn

Insider Guo Jack Q.

Role EVP & CFO

Type	Security	Shares	Price	Value
Grant/Award	Ordinary shares	19,690	$0.00	$0.00

Holdings After Transaction: Ordinary shares — 210,569 shares (Direct)

Footnotes (1)

1. F1. Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Constellium (CSTM) report for Jack Q. Guo?

Constellium EVP & CFO Jack Q. Guo received a grant of 19,690 restricted stock units. These awards are part of his equity compensation and increase his direct holdings to 210,569 ordinary shares, aligning his interests more closely with long-term company performance.

How many Constellium (CSTM) shares does Jack Q. Guo hold after this grant?

After the restricted stock unit grant, Jack Q. Guo directly holds 210,569 ordinary shares of Constellium SE. This total includes the newly granted 19,690 RSUs, which will convert into shares when they vest, assuming his continued employment through the vesting date.

What are the terms of Jack Q. Guo’s new Constellium (CSTM) restricted stock units?

The award consists of 19,690 restricted stock units that vest in full on March 12, 2029. Vesting is contingent on Jack Q. Guo’s continued employment with Constellium SE, meaning the units are forfeited if that condition is not met before the vesting date.

Did Jack Q. Guo buy Constellium (CSTM) shares in the open market?

No, the transaction reflects a grant of 19,690 restricted stock units at no purchase price, not an open-market share purchase. It is a compensation-related award from Constellium SE rather than a discretionary buy of stock on an exchange.

Is Jack Q. Guo’s Constellium (CSTM) share grant a cash transaction?

The grant is not a cash transaction; it is an equity-based compensation award of 19,690 restricted stock units at a stated price of zero. Value to Jack Q. Guo depends on Constellium’s share price when the units vest in 2029.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/16/2026 - 09:37 AM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP & CFO

3. Date of Earliest Transaction (Month/Day/Year)
03/12/2026

4. 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 Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary shares	03/12/2026	03/12/2026	A		19,690(1)	A	$0	210,569	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the grant of restricted stock units of Constellium SE, which vest in full on March 12, 2029, subject to the Reporting Person's continued employment.

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Jack Guo	03/16/2026
	** 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 4 (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.