Millennium Group files 13G/A on Constellium (NYSE: CSTM) showing 2.5% stake

Rhea-AI Filing Summary

Constellium SE received an amendment to a Schedule 13G reporting that Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander share dispositive and voting power over 3,470,091 ordinary shares of Constellium. The filing (Amendment No. 1) states this equals 2.5% of the class and attaches a Joint Filing Agreement dated April 23, 2026.

Key Figures

Shares disclosed: 3,470,091 shares Percent of class: 2.5% CUSIP: F21107101 +1 more

4 metrics

Shares disclosed 3,470,091 shares Amount reported as shared voting/dispositive power

Percent of class 2.5% Percent of ordinary shares reported on cover pages

CUSIP F21107101 Identifier for Constellium ordinary shares

Joint Filing Agreement date April 23, 2026 Date of Exhibit I attached to the amendment

Key Terms

Schedule 13G/A, Shared Dispositive Power, Joint Filing Agreement

3 terms

Schedule 13G/A regulatory

"Amendment No. 1 ) Constellium SE Ordinary Shares"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Shared Dispositive Power financial

"Shared Dispositive Power 3,470,091.00"

Joint Filing Agreement legal

"Exhibit I: Joint Filing Agreement, dated as of April 23, 2026"

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Constellium SE

(Name of Issuer)

Ordinary Shares

(Title of Class of Securities)

F21107101

(CUSIP Number)

03/31/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): F21107101

1

Names of Reporting Persons

Millennium Management LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 3,470,091.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,470,091.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,470,091.00

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)

2.5 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): F21107101

1

Names of Reporting Persons

Millennium Group Management LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 3,470,091.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,470,091.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,470,091.00

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)

2.5 %

12

Type of Reporting Person (See Instructions)

OO

SCHEDULE 13G

CUSIP Number(s): F21107101

1

Names of Reporting Persons

Israel A. Englander

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 3,470,091.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 3,470,091.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,470,091.00

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)

2.5 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Constellium SE
(b)	Address of issuer's principal executive offices: 300 East Lombard Street, Suite 1710, Baltimore, Maryland 21202
Item 2.
(a)	Name of person filing: Millennium Management LLC Millennium Group Management LLC Israel A. Englander
(b)	Address or principal business office or, if none, residence: Millennium Management LLC 399 Park Avenue New York, New York 10022 Millennium Group Management LLC 399 Park Avenue New York, New York 10022 Israel A. Englander c/o Millennium Management LLC 399 Park Avenue New York, New York 10022
(c)	Citizenship: Millennium Management LLC - Delaware Millennium Group Management LLC - Delaware Israel A. Englander - United States
(d)	Title of class of securities: Ordinary Shares
(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: See response to Item 9 on each cover page.
(b)	Percent of class: See response to Item 11 on each cover page.
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: See response to Item 5 on each cover page.
	(ii) Shared power to vote or to direct the vote: See response to Item 6 on each cover page.
	(iii) Sole power to dispose or to direct the disposition of: See response to Item 7 on each cover page.
	(iv) Shared power to dispose or to direct the disposition of: See response to Item 8 on each cover page. The securities disclosed herein as potentially beneficially owned by Millennium Management LLC, Millennium Group Management LLC and Mr. Englander are held by entities subject to voting control and investment discretion by Millennium Management LLC and/or other investment managers that may be controlled by Millennium Group Management LLC (the managing member of Millennium Management LLC) and Mr. Englander (the sole voting trustee of the managing member of Millennium Group Management LLC). The foregoing should not be construed in and of itself as an admission by Millennium Management LLC, Millennium Group Management LLC or Mr. Englander as to beneficial ownership of the securities held by such entities.
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.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(J), so indicate under Item 3(j) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. See Exhibit I
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 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.

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.

Millennium Management LLC

Signature:	/s/ Gil Raviv
Name/Title:	Gil Raviv, Global General Counsel
Date:	04/23/2026

Millennium Group Management LLC

Signature:	/s/ Gil Raviv
Name/Title:	Gil Raviv, Global General Counsel
Date:	04/23/2026

Israel A. Englander

Signature:	/s/ Israel A. Englander
Name/Title:	Israel A. Englander
Date:	04/23/2026

Exhibit Information

Exhibit I: Joint Filing Agreement, dated as of April 23, 2026, by and among Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander.

FAQ

What does the Constellium (CSTM) Schedule 13G/A amendment report?

The amendment reports that Millennium entities and Israel A. Englander share voting and dispositive power over 3,470,091 ordinary shares. It records a 2.5% stake and includes a joint filing agreement dated April 23, 2026.

Who filed the Schedule 13G/A amendment for CSTM?

Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander are named filers. The filing lists their addresses at 399 Park Avenue, New York and cites Delaware/U.S. citizenship for the entities and individual.

Does the filing claim direct beneficial ownership of the reported shares?

The filing states the shares are held by entities subject to voting control or investment discretion by Millennium and related managers and notes this should not be construed as an admission of beneficial ownership by the filers.

What document formalizes the joint filing between the filers?

A Joint Filing Agreement dated April 23, 2026 is attached as Exhibit I and governs the joint filing by Millennium Management LLC, Millennium Group Management LLC and Israel A. Englander.

What CUSIP and class are reported in the filing?

The filing references CUSIP F21107101 and reports the class as Ordinary Shares of Constellium SE.