[SCHEDULE 13G/A] Constellium SE SEC Filing

Rhea-AI Filing Summary

T. Rowe Price Investment Management, Inc. reports beneficial ownership of 6,274,993 shares of Constellium SE common stock, representing 4.5% of the class. The filer discloses sole voting power over 6,245,150 shares and sole dispositive power over 6,274,993 shares, with no shared voting or dispositive powers reported.

The filing states the securities are held in the ordinary course of business and were not acquired to change or influence control of the issuer. The report classifies the holder as an investment adviser and indicates ownership falls within the scope described as ownership of 5 percent or less of a class.

Positive

• Public disclosure of a substantial institutional position (6,274,993 shares, 4.5% of class)
• Sole voting and dispositive power reported, providing clarity on who directs votes and dispositions

Negative

• None.

Insights

Financial Analyst

TL;DR T. Rowe Price holds a disclosed 4.5% stake in Constellium with full voting and dispositive authority over those shares.

The reported position of 6.27 million shares, representing 4.5% of the outstanding class, is significant enough to register public disclosure but remains below the typical 5% threshold that often triggers heightened investor attention or activist signaling. The breakdown shows almost all shares are under sole voting control, which means the adviser can direct voting decisions for this stake. The filer’s certification that the stake is held in the ordinary course of business and not for control purposes limits the immediate corporate-governance implications. For investors, this filing documents a clear institutional interest without indicating an intent to pursue control or a campaign.

Corporate Governance Expert

TL;DR Institutional disclosure confirms a material passive holding but does not indicate governance activism.

The Schedule 13G classification and the explicit certification that the position is not intended to influence control align with passive investor behavior. Sole voting power over 6.245 million shares implies the adviser will vote proxies for those shares, which can influence close shareholder votes even if the stake is under 5%. However, because the interest is reported as 4.5% and the filer denies an intent to change control, this should be treated as routine institutional ownership rather than a governance event. Monitor future filings for any shift to a Schedule 13D or changes in stated intent.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 6)

CONSTELLIUM SE

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

F21107101

(CUSIP Number)

08/31/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. F21107101

1

Names of Reporting Persons

T. Rowe Price Investment Management, Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MARYLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 6,245,150.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 6,274,993.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,274,993.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.5 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: CONSTELLIUM SE
(b)	Address of issuer's principal executive offices: WASHINGTON PLAZA, 40-44 RUE WASHINGTON, PARIS, I0, 75008
Item 2.
(a)	Name of person filing: T. Rowe Price Investment Management, Inc.
(b)	Address or principal business office or, if none, residence: 1307 Point Street, Baltimore, MD 21231
(c)	Citizenship: Maryland
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: F21107101
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 6274993
(b)	Percent of class: 4.5 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 6245150
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 6274993
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. T. Rowe Price Investment Management, Inc. hereby declares and affirms that the filing of Schedule 13G shall not be construed as an admission that Price Investment Management is the beneficial owner of the securities referred to, which beneficial ownership is expressly denied.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

T. Rowe Price Investment Management, Inc.

Signature:	Ellen York
Name/Title:	Vice President
Date:	09/08/2025

FAQ

What stake does T. Rowe Price hold in Constellium SE (CSTM)?

T. Rowe Price reports beneficial ownership of 6,274,993 shares, representing 4.5% of Constellium SE common stock.

Does T. Rowe Price have voting control over the Constellium shares?

Yes. The filer reports sole voting power over 6,245,150 shares and sole dispositive power over 6,274,993 shares.

Is this filing an indication of an attempt to influence Constellium's control?

No. The filing certifies the securities are held in the ordinary course of business and were not acquired to change or influence control.

Under which filing category was this position reported?

The position is reported on a Schedule 13G, consistent with institutional passive holdings rather than an active acquisition for control.

Does the filing indicate any shared voting or dispositive power?

No. The filing reports 0 shares with shared voting power and 0 shares with shared dispositive power.