CONSTELLIUM executive files initial ownership report

CONSTELLIUM SE senior vice president and Chief Innovation Officer Jarrett Martin filed an initial Form 3 detailing his equity holdings in the company.

Rhea-AI Filing Summary

CONSTELLIUM SE senior vice president and Chief Innovation Officer Jarrett Martin filed an initial Form 3 detailing his equity holdings in the company. He reports beneficial ownership of 20,091 ordinary shares as of April 1, 2026, consisting of 9,554 ordinary shares held directly and 10,537 restricted stock units that are still subject to vesting restrictions. This filing records his starting ownership position as an officer rather than reporting a new stock purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Jarrett Martin

Role SVP Chief Innovation Officer

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

Holdings After Transaction: Ordinary shares — 20,091 shares (Direct)

Footnotes (1)

1. F1. Amount consists of (i) 9,554 ordinary shares held by the Reporting Person as of April 1, 2026 and (ii) an aggregate of 10,537 restricted stock units which remain subject to vesting restrictions.

Key Figures

Total beneficial ownership: 20,091 ordinary-share equivalent units Directly held ordinary shares: 9,554 shares Restricted stock units: 10,537 RSUs

3 metrics

Total beneficial ownership 20,091 ordinary-share equivalent units As of April 1, 2026; includes shares and RSUs

Directly held ordinary shares 9,554 shares Held by Jarrett Martin as of April 1, 2026

Restricted stock units 10,537 RSUs Remain subject to vesting restrictions as of April 1, 2026

Key Terms

Ordinary shares, restricted stock units, vesting restrictions, Form 3

4 terms

Ordinary shares financial

"Amount consists of (i) 9,554 ordinary shares held by the Reporting Person"

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

restricted stock units financial

"and (ii) an aggregate of 10,537 restricted stock units which remain subject"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

vesting restrictions financial

"10,537 restricted stock units which remain subject to vesting restrictions."

Form 3 regulatory

"INSIDER FILING DATA (Form 3):"

Form 3 is the initial public filing that officers, directors and large shareholders must submit to report their ownership of a company’s securities when they become insiders. It acts like an opening inventory sheet that gives investors a starting point to see who holds significant stakes and to spot later trades or potential conflicts of interest, helping assess insider confidence and transparency.

FAQ

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

What does Jarrett Martin’s Form 3 filing for CONSTELLIUM (CSTM) show?

The Form 3 shows Jarrett Martin’s initial ownership in CONSTELLIUM SE. He reports 20,091 ordinary shares as of April 1, 2026, combining directly held shares and restricted stock units subject to vesting. It records holdings, not a new trade.

How many CONSTELLIUM (CSTM) shares does Jarrett Martin hold directly?

Jarrett Martin holds 9,554 CONSTELLIUM SE ordinary shares directly as of April 1, 2026. These are separate from his restricted stock units, which are additional awards that will convert into shares only if vesting conditions are met.

How many restricted stock units does Jarrett Martin have at CONSTELLIUM (CSTM)?

He holds 10,537 restricted stock units with CONSTELLIUM SE. These RSUs remain subject to vesting restrictions, meaning they will turn into ordinary shares only if specified service or performance conditions are satisfied over time.

Does Jarrett Martin’s Form 3 for CONSTELLIUM (CSTM) indicate a recent stock trade?

The Form 3 does not indicate a recent stock trade. It is an initial ownership report showing Jarrett Martin’s existing holdings—both ordinary shares and restricted stock units—as of April 1, 2026, rather than new purchases or sales.

What role does Jarrett Martin hold at CONSTELLIUM (CSTM) in this Form 3?

In this Form 3, Jarrett Martin is identified as CONSTELLIUM SE’s Senior Vice President and Chief Innovation Officer. The filing links his executive position to his reported equity stake in the company’s ordinary shares and restricted stock units.

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

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Accepted by SEC EDGAR 04/09/2026 - 08:36 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^*

Jarrett Martin

(Last) (First) (Middle)

300 EAST LOMBARD STREET

SUITE 1710

(Street)

BALTIMORE MARYLAND 21202

(City) (State) (Zip)

UNITED STATES

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
04/01/2026

3. Issuer Name and Ticker or Trading Symbol
CONSTELLIUM SE [ CSTM ]

3a. Foreign Trading Symbol

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

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

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

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	20,091(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) 9,554 ordinary shares held by the Reporting Person as of April 1, 2026 and (ii) an aggregate of 10,537 restricted stock units which remain subject to vesting restrictions.

Remarks:

	Kristine Carpenter, Attorney-in-fact for Martin Jarrett	04/09/2026
	** 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.
* Form 3: SEC 1473 (03-26)