Constellium executive corrects Form 3 holdings

CONSTELLIUM SE executive Stephen Charles Walters filed an amended Form 3 to correct his reported equity holdings.

Rhea-AI Filing Summary

CONSTELLIUM SE executive Stephen Charles Walters filed an amended Form 3 to correct his reported equity holdings. The amendment shows a total interest in 20,734 ordinary-share-linked units, consisting of 1,500 ordinary shares held directly as of January 1, 2026 and 19,234 restricted stock units that remain subject to vesting restrictions and were previously omitted from his original Form 3 and one Form 4. This update does not reflect any new share purchases or sales, but rather a clarification of prior disclosures.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Walters Stephen Charles

Role SVP GC & Secretary

Type	Security	Shares	Price	Value
holding	Ordinary shares	--	--	--

Holdings After Transaction: Ordinary shares — 20,734 shares (Direct)

Footnotes (1)

1. F1. Amount consists of (i) 1,500 ordinary shares held by the Reporting Person as of January 1, 2026 and (ii) an aggregate of 19,234 restricted stock units which remain subject to vesting restrictions and which were inadvertently omitted from the Reporting Person's original Form 3 filing and one Form 4 filed by the Reporting Person prior to the date of this amendment.

FAQ

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

What does the amended Form 3 for CONSTELLIUM SE (CSTM) report for Stephen Walters?

The amended Form 3 updates Stephen Walters’ reported holdings to 20,734 ordinary-share-linked units. This consists of 1,500 ordinary shares and 19,234 restricted stock units, correcting prior underreported amounts without reflecting any new buy or sell transactions.

How many CONSTELLIUM SE (CSTM) ordinary shares does Stephen Walters hold directly?

Stephen Walters holds 1,500 CONSTELLIUM SE ordinary shares directly as of January 1, 2026. In addition, he is credited with 19,234 restricted stock units that remain subject to vesting, bringing his total reported interest to 20,734 units.

What are the restricted stock units disclosed in the CONSTELLIUM SE (CSTM) Form 3/A?

The filing lists 19,234 restricted stock units for Stephen Walters. These units are tied to CONSTELLIUM SE ordinary shares, remain subject to vesting conditions, and were inadvertently omitted from his original Form 3 and one prior Form 4 filing.

Does the CONSTELLIUM SE (CSTM) Form 3/A indicate insider buying or selling by Stephen Walters?

No, the Form 3/A does not indicate new buying or selling activity. It corrects previously reported holdings by adding 19,234 restricted stock units and confirming 1,500 directly held ordinary shares, clarifying his total reported interest of 20,734 units.

Why did CONSTELLIUM SE (CSTM) executive Stephen Walters amend his Form 3?

Stephen Walters amended his Form 3 because 19,234 restricted stock units were inadvertently omitted from his original Form 3 and one earlier Form 4. The amendment corrects his total reported interest without changing any past transaction prices or volumes.

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

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Accepted by SEC EDGAR 03/11/2026 - 06:23 AM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

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. 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 GC & Secretary

5. If Amendment, Date of Original Filed (Month/Day/Year)
01/02/2026

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	20,734(1)	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:

1. Amount consists of (i) 1,500 ordinary shares held by the Reporting Person as of January 1, 2026 and (ii) an aggregate of 19,234 restricted stock units which remain subject to vesting restrictions and which were inadvertently omitted from the Reporting Person's original Form 3 filing and one Form 4 filed by the Reporting Person prior to the date of this amendment.

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Stephen Walters	03/11/2026
	** 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.