Constellium (NYSE: CSTM) SVP receives 5,834-share equity grant

Rhea-AI Filing Summary

CONSTELLIUM SE reported that SVP GC & Secretary Stephen Charles Walters received a grant or award of 5,834 ordinary shares on 2026-03-12. Following this acquisition, he directly owns a total of 25,068 ordinary shares.

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

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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^*

Walters Stephen Charles

(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)
	SVP GC & Secretary

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		5,834	A	$0	25,068	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:

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Stephen Walters	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.

FAQ

What insider transaction did CONSTELLIUM SE (CSTM) report for Stephen Charles Walters?

Stephen Charles Walters received a grant or award of 5,834 ordinary shares. The Form 4 shows this non-derivative acquisition increased his directly held stake in Constellium SE, reflecting updated insider ownership rather than an open-market purchase or sale.

When did the 5,834-share grant to CONSTELLIUM SE SVP Stephen Walters occur?

The grant or award was dated 2026-03-12. On that date, Walters was credited with 5,834 ordinary shares of Constellium SE, as disclosed in the Form 4 insider filing covering his non-derivative equity holdings in the company.

How many CONSTELLIUM SE shares does Stephen Walters own after this Form 4 transaction?

After the transaction, Stephen Walters directly owns 25,068 ordinary shares. The Form 4 states this post-transaction total, reflecting his updated direct ownership position following the 5,834-share grant or award on 2026-03-12.

What type of Form 4 transaction is the 5,834-share award at CONSTELLIUM SE?

The 5,834-share award is classified as a grant, award, or other acquisition. It is coded as an “A” non-derivative transaction, indicating shares were granted rather than bought in the open market or acquired through option exercise.

Does Stephen Walters hold CONSTELLIUM SE shares directly or indirectly after this grant?

Stephen Walters holds these CONSTELLIUM SE shares directly. The Form 4 lists his ownership type as direct, with 25,068 ordinary shares held in his own name following the 5,834-share grant reported in the filing.