CSTM files Rule 144 notice for Ordinary Shares

CSTM submitted a Rule 144 notice for Ordinary Shares.

Rhea-AI Filing Summary

CSTM submitted a Rule 144 notice for Ordinary Shares. The filing lists 2,095,000 shares alongside $69,637,800.00 and the figure 136,150,450 with an as of date of 05/26/2026. The notice also records prior acquisition lots: 645,488 (05/29/2013), 2,447,578 (11/03/2017), and 1,096,934 (06/05/2017).

Insights

Securities Compliance Counsel

Rule 144 notice filed listing specific share lots and dates.

The filing lists $69,637,800.00 and 2,095,000 Ordinary Shares with an 05/26/2026 stamp. It records prior acquisition lots dated 05/29/2013, 11/03/2017, and 06/05/2017.

These entries are procedural disclosures required under Rule 144; cash‑flow treatment and intended sale timing are not stated in the excerpt. Subsequent trading activity would appear in market reports or further filings.

Key Figures

Noticed shares: 2,095,000 shares Dollar figure shown: $69,637,800.00 Context figure: 136,150,450 +3 more

6 metrics

Noticed shares 2,095,000 shares listed near broker entries with <date>05/26/2026</date>

Dollar figure shown $69,637,800.00 appears adjacent to the 2,095,000 entry and date <date>05/26/2026</date>

Context figure 136,150,450 listed alongside the other figures with date <date>05/26/2026</date>

IPO lot 645,488 shares acquired <date>05/29/2013</date> in initial public offering

Underwritten offering lot 2,447,578 shares acquired <date>11/03/2017</date> in underwritten offering

Open market purchases 1,096,934 shares acquired <date>06/05/2017</date> via open market purchases

Key Terms

Rule 144, IPO Underwriters, Open Market Purchases

3 terms

Rule 144 regulatory

"144: Securities To Be Sold"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

IPO Underwriters financial

"Purchased in initial public offering | IPO Underwriters"

Open Market Purchases market

"Open Market Purchases | 06/05/2017"

Open market purchases are buys of a company’s shares (or other securities) made on public exchanges at prevailing market prices rather than through private deals. For investors this matters because when a company buys back its own stock it reduces the number of shares available, which can boost per-share earnings and often signals management’s confidence; it also affects supply, demand and short-term liquidity much like someone quietly buying up items from a crowded marketplace.

FAQ

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

What does the CSTM Rule 144 notice report?

The notice reports 2,095,000 Ordinary Shares, associated with $69,637,800.00 and the figure 136,150,450, with an as of date of 05/26/2026. It also lists acquisition lots dated 2013 and 2017.

Which prior acquisition dates are shown in the CSTM excerpt?

The excerpt lists three prior lots: 645,488 shares on 05/29/2013, 2,447,578 shares on 11/03/2017, and 1,096,934 shares on 06/05/2017. Each lot is labeled with its acquisition method.

Does the filing state who will receive proceeds from any sale?

The provided excerpt does not state proceeds recipients or sale instructions. It lists brokers and quantities but cash‑flow treatment is not specified in the visible content; no use‑of‑proceeds language appears in the excerpt.

Is the filing a registration or a resale offering for CSTM?

This document is a Rule 144 notice, which is a disclosure under resale rules; it is not a registration statement. The excerpt lists resale lots and acquisition dates rather than an offering prospectus.

Which brokers or underwriters are referenced in the excerpt?

The excerpt names BNP Paribas Securities Corp. and J.P. Morgan Securities LLC and shows those firms alongside numeric entries including 2,095,000 and $69,637,800.00, linked to the 05/26/2026 date.

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

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Accepted by SEC EDGAR 05/26/2026 - 07:59 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001581835
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	CONSTELLIUM SE
SEC File Number	001-35931
Address of Issuer	300 East Lombard Street Suite 1710 Baltimore MARYLAND 21202
Phone	443-420-7861
Name of Person for Whose Account the Securities are To Be Sold	Bpifrance Participations SA
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	May be deemed an affiliate

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Ordinary Shares	BNP Paribas Securities Corp. 787 7th Avenue New York NY 10019	2095000	69637800.00	136150450	05/26/2026	NYSE
Ordinary Shares	J.P. Morgan Securities LLC 270 Park Avenue New York NY 10017	2095000	69637800.00	136150450	05/26/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Ordinary Shares	05/29/2013	Purchased in initial public offering	IPO Underwriters			645488	05/29/2013	Cash
Ordinary Shares	11/03/2017	Underwritten Offering	Underwriter			2447578	11/03/2017	Cash
Ordinary Shares	06/05/2017	Open Market Purchases	Open Market Purchases			1096934	06/05/2017	Cash

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks	Aggregate market value is as of May 22, 2026. The 1,096,934 shares acquired in open market purchases were acquired and paid for between 6/5/2017 and 9/8/2017
Date of Notice	05/26/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Emmanuel Blot, as Investment Director
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)