Constellium (NYSE: CSTM) CFO corrects Form 3 to include RSUs

Rhea-AI Filing Summary

CONSTELLIUM SE executive vice president and CFO Jack Q. Guo amended his insider holdings disclosure. The Form 3/A reports beneficial ownership of 156,722 ordinary shares, consisting of 73,792 ordinary shares held as of January 1, 2026 and 82,930 restricted stock units that remain subject to vesting and were previously omitted.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Guo Jack Q.

Role EVP & CFO

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

Holdings After Transaction: Ordinary shares — 156,722 shares (Direct)

Footnotes (1)

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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^*

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)
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	156,722(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) 73,792 ordinary shares held by the Reporting Person as of January 1, 2026 and (ii) an aggregate of 82,930 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 Jack Guo	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) CFO Jack Guo report in this Form 3/A?

Constelium EVP and CFO Jack Q. Guo reports beneficial ownership of 156,722 ordinary shares. This total includes both directly held shares and restricted stock units that remain subject to vesting conditions as of January 1, 2026.

How many Constellium (CSTM) ordinary shares does the CFO hold directly?

Jack Q. Guo holds 73,792 ordinary shares directly as of January 1, 2026. These shares are separate from his additional restricted stock units, which are part of his equity-based compensation and remain unvested at that date.

How many restricted stock units does the Constelium (CSTM) CFO report?

The filing states that Jack Q. Guo holds 82,930 restricted stock units. These RSUs remain subject to vesting restrictions and were inadvertently omitted from his original Form 3, prompting this amended Form 3/A disclosure.

Why did Constelium (CSTM) file an amended Form 3/A for its CFO?

Constelium filed the amended Form 3/A because 82,930 restricted stock units were inadvertently omitted from Jack Q. Guo’s original Form 3. The amendment corrects his total reported beneficial ownership as of January 1, 2026.

Does the Constelium (CSTM) Form 3/A show any new insider buy or sell transactions?

The Form 3/A does not report new buy or sell transactions. It updates Jack Q. Guo’s holdings detail, specifying directly held ordinary shares and restricted stock units that were previously omitted from his initial beneficial ownership report.