Perkins RSU holdings corrected in Constellium (NYSE: CSTM) insider filing

Rhea-AI Filing Summary

CONSTELLIUM SE filed an amended Form 3 for executive Matthew B. Perkins, President, P&ARP. The amendment clarifies that he beneficially owns an aggregate of 23,002 restricted stock units, which remain subject to vesting restrictions and were inadvertently omitted from his original Form 3 filing. This is a holdings correction, not a new share purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Perkins Matthew B.

Role President, P&ARP

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

Holdings After Transaction: Ordinary shares — 23,002 shares (Direct)

Footnotes (1)

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Understanding Insider Trading Forms →

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^*

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)
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	23,002(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 an aggregate of 23,002 restricted stock units which remain subject to vesting restrictions and which were inadvertently omitted from the Reporting Person's original Form 3 filing.

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Matthew Perkins	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.

FAQ

What does Constelium (CSTM) disclose in Matthew B. Perkins' amended Form 3?

The amended Form 3 shows Matthew B. Perkins holds 23,002 restricted stock units in CONSTELLIUM SE. These units remain subject to vesting restrictions and were previously inadvertently omitted from his original Form 3 filing, so this amendment corrects his reported holdings.

Did Matthew B. Perkins buy or sell Constelium (CSTM) shares in this Form 3/A?

No, the Form 3/A does not report any new transactions. It simply updates Perkins’ beneficial ownership to include 23,002 restricted stock units that were omitted in error from the original Form 3, with no recorded purchases or sales.

How many Constelium (CSTM) restricted stock units does Matthew B. Perkins hold?

Matthew B. Perkins is reported as holding an aggregate of 23,002 restricted stock units of CONSTELLIUM SE. According to the filing, these RSUs remain subject to vesting restrictions, meaning he does not yet fully own the underlying ordinary shares.

Why was Matthew B. Perkins' original Constelium (CSTM) Form 3 amended?

The original Form 3 was amended because it inadvertently omitted 23,002 restricted stock units. The Form 3/A corrects this oversight by adding these unvested RSUs to Perkins’ reported holdings, improving the accuracy of his beneficial ownership disclosure.

What type of security is reported in Constelium (CSTM) executive Matthew B. Perkins' Form 3/A?

The Form 3/A reports restricted stock units tied to CONSTELLIUM SE ordinary shares. In total, Perkins holds 23,002 RSUs, which are subject to vesting conditions before converting into ordinary shares that he can fully own.