Constellium director reports holdings of CSTM ordinary shares

Constellium SE director reports share holdings in a beneficial ownership statement dated 01/01/2026.

Rhea-AI Filing Summary

Constellium SE director reports share holdings in a beneficial ownership statement dated 01/01/2026. The reporting person, a director of Constellium SE (CSTM), lists ownership of 97,741 ordinary shares held directly. Additional indirect holdings include 22,000 ordinary shares held by the director's spouse and 92,000 ordinary shares held through a family limited partnership. The reporting person states that beneficial ownership of the indirect holdings is disclaimed except to the extent of her pecuniary interest.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider BROOKS MARTHA

Role Director

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

Holdings After Transaction: Ordinary shares — 97,741 shares (Direct); Ordinary shares — 22,000 shares (Indirect, By spouse); Ordinary shares — 92,000 shares (Indirect, Family limited partnership)

Footnotes (1)

1. F1. The Reporting Person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16.

FAQ

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

What does Constellium SE (CSTM) disclose in this beneficial ownership filing?

This filing discloses that a director of Constellium SE reports ownership of 97,741 ordinary shares directly, plus additional ordinary shares held indirectly through a spouse and a family limited partnership.

How many Constellium SE (CSTM) shares does the director hold directly and indirectly?

The director holds 97,741 ordinary shares directly, 22,000 ordinary shares indirectly through a spouse, and 92,000 ordinary shares indirectly through a family limited partnership.

What is the director’s relationship to Constellium SE (CSTM)?

The reporting person is identified as a director of Constellium SE, as indicated in the relationship section of the ownership statement.

How are the indirect Constellium SE (CSTM) shareholdings structured?

Indirect holdings consist of 22,000 ordinary shares held by the director’s spouse and 92,000 ordinary shares held through a family limited partnership.

Does the director claim full beneficial ownership of all reported Constellium SE (CSTM) shares?

No. The director disclaims beneficial ownership of the indirectly held securities except to the extent of her pecuniary interest, as stated in the explanation of responses.

What is the event date for this Constellium SE (CSTM) ownership report?

The date of the event requiring the statement is 01/01/2026, as specified in the filing.

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Accepted by SEC EDGAR 01/02/2026 - 10:44 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^*

BROOKS MARTHA

(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)

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

5. 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 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	97,741	D
Ordinary shares	22,000	I	By spouse
Ordinary shares	92,000	I(1)	Family limited partnership

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. The Reporting Person disclaims beneficial ownership of these securities except to the extent of her pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16.

Remarks:

	/s/ Kristine Carpenter, Attorney-in-Fact for Martha Brooks	01/02/2026
	** 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.