CSTM / Constellium SE - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Articles of Association of Constellium SE dated May 15, 2025**

exhibit31cstmsexaoax15m TRANSLATION FROM FRENCH INTO ENGLISH (solely for convenience of English speaking users) CONSTELLIUM SE A European company with share capital of €2,936,397.

Jack Guo's employment addendum dated June 1, 2025**†

exhibit101jguo-addendum Constellium US Holdings I, LLC 300 East Lombard Street, 17th Floor Baltimore, MD 21202 Personal and Confidential June 1, 2025 Personal / Confidential Jack Guo Employment Addendum Dear Jack, To recognize your significant contributions across Constellium, we would like to designate you as Executive Vice President and CFO, effective June 1, 2025.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PU

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-35931 Constelliu

Second Quarter 2025 Earnings Call July 29, 2025 Jean-Marc Germain Chief Executive Officer Q2 2025 Highlights Safety: Recordable case rate (RCR)(1) of 2.6 per million hours worked in Q2 2025; YTD RCR of 1.8 per million hours worked Shipments: 384 thou

Exhibit 99.2 Second Quarter 2025 Earnings Call July 29, 2025 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and our

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 29, 2025 Constellium SE (Exa

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): July 29, 2025 Constellium SE (Exact name of registrant as specified in its charter) France 001-35931 98-0667516 (State or Other Jurisdiction of Incorporation) (Commission File Number)

Three months ended June 30,

Exhibit 99.1 July 29, 2025 Constellium Reports Second Quarter and First Half 2025 Results; Raises Full Year 2025 Guidance Paris - Constellium SE (NYSE: CSTM) ("Constellium" or the "Company") today reported results for the second quarter and the first half ended June 30, 2025. Second quarter 2025 highlights: • Shipments of 384 thousand metric tons, up 2% compared to Q2 2024 • Revenue of $2.1 billio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 98-0667516 (State or Other Jurisdiction of Incorporation or Organization) (Commission File Number) (I.R.S. Employer Identification No.) 300 East Lombard Street Suite 1710 Baltimore, MD 21202 United States (A

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 22, 2025 (May 15, 2025) Constellium SE (Exact name of registrant as specified in its charter) France 001-35931 98-0667516 (State or Other Jurisdiction of Incorporation) (Commissio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 ☐ TRANSITION REPORT P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-35931 Constelli

First Quarter 2025 Earnings Call April 30, 2025 Jean-Marc Germain Chief Executive Officer Q1 2025 Highlights Safety: Recordable case rate(1) of 1.02 per million hours worked in Q1 2025 Shipments: 372 thousand tons (-2% YoY) Revenue: $2.0 billion (+5%

Exhibit 99.2 First Quarter 2025 Earnings Call April 30, 2025 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and our

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 30, 2025 Constellium SE (Exact name of registrant as specified in its charter) France 001-35931 98-0667516 (State or Other Jurisdiction of Incorporation) (Commission File Number

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Exhibit 99.1 April 30, 2025 Constellium Reports First Quarter 2025 Results and Maintains Full Year 2025 Guidance Paris - Constellium SE (NYSE: CSTM) ("Constellium" or the "Company") today reported results for the first quarter ended March 31, 2025. First quarter 2025 highlights: • Shipments of 372 thousand metric tons, down 2% compared to Q1 2024 • Revenue of $2.0 billion, up 5% compared to Q1 202

Financial Statements and Exhibits, Other Events

falseCONSTELLIUM SE0001563411WASHINGTON PLAZA40-44 RUE WASHINGTONPARISFR7500833173014651NYSE00015634112025-04-152025-04-15 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.

Description of Securities Registered under Section 12 of the Exchange Act**

Exhibit 4.1 DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of the ordinary shares and the Articles of Association of Constellium SE (“Constellium SE” or the “Company”) is a summary and does not purport to be complete. This summary is subject to, and qualified in its entirety by reference to, the complete text of the Company’s

Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY FOR SHAREHOLDERS ON

Exhibit 99.2 Signature [PLEASE SIGN WITHIN BOX] Date Signature (Joint Owners) Date TO VOTE, MARK BLOCKS BELOW IN BLUE OR BLACK INK AS FOLLOWS: KEEP THIS PORTION FOR YOUR RECORDS DETACH AND RETURN THIS PORTION ONLY THIS PROXY CARD IS VALID ONLY FOR SHAREHOLDERS ON THE U.S. REGISTER, AND WHEN SIGNED AND DATED. V69296-P29931-P31037 CONSTELLIUM SE WASHINGTON PLAZA 40-44, RUE WASHINGTON 75008 PARIS, FR

Form of 2025 Long Term Incentive Award Letter for a grant of Restricted Stock Units and Performance Share Units**

Exhibit 10.73 March XX, 2025 FORM 2025 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below. These Units entitle you to receive Constellium Shares (or a cash equivalent, at Constellium’s discretion), subject to the terms and conditions set forth in this Award Letter, in the Constellium 2025 Long Term Inc

Amendment No. 6 to the Constellium SE 2013 Equity Incentive Plan, effective as of March 13, 2025 **

Exhibit 10.61 AMENDMENT NO. 6 TO THE CONSTELLIUM SE 2013 EQUITY INCENTIVE PLAN WHEREAS, Constellium SE, a French Societas Europaea (the “Company”), has adopted the Constellium SE 2013 Equity Incentive Plan (as amended from time to time, the “Plan”); WHEREAS, the Board of Directors of the Company (the “Board”) approved an amendment of the Plan so that the maximum number of shares available under th

2025 Long Term Incentive Award Agreement, effective as of March 13, 2025**

Exhibit 10.71 2025 Long Term Incentive Award Agreement Terms and Conditions Effective as from March 13, 2025 1. BACKGROUND This Award Agreement is adopted under the Constellium SE 2013 Equity Incentive Plan, as amended and restated from time to time (the “Plan”). The Units awarded under this Award Agreement entitle the Participant to receive Constellium Shares or a cash equivalent, subject to the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K/A (Amendment No. 1) (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-

Constellium SE Washington Plaza 40-44 rue Washington 75008 Paris, France PROXY STATEMENT FOR THE ANNUAL GENERAL MEETING OF SHAREHOLDERS to be held on May 15, 2025 The Proxy Statement and Annual Report are available at

TABLE OF CONTENTS Exhibit 99.1   Constellium SE Washington Plaza 40-44 rue Washington 75008 Paris, France PROXY STATEMENT FOR THE ANNUAL GENERAL MEETING OF SHAREHOLDERS to be held on May 15, 2025 The Proxy Statement and Annual Report are available at http://www.constellium.com This Proxy Statement is being furnished to you by the Board of Directors of Constellium SE (the “Company,” “Constellium SE

Form of 2025 Long Term Incentive Award Letter for a grant of Restricted Stock Units**

Exhibit 10.72 March XX, 2025 FORM 2025 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below. These Units entitle you to receive Constellium Shares (or a cash equivalent, at Constellium’s discretion), subject to the terms and conditions set forth in this Award Letter, in the Constellium 2025 Long Term Inc

EX-99.3

Exhibit 99.3

First Amendment to Constellium US Holdings I, LLC U.S. Nonqualified Deferred Compensation and Restoration

1 FIRST AMENDMENT TO CONSTELLIUM US HOLDINGS I, LLC U.S. NONQUALIFIED DEFERRED COMPENSATION AND RESTORATION PLAN The Constellium US Holdings I, LLC U.S. Nonqualified Deferred Compensation and Restoration Plan, effective as of January 1, 2019 (the “Plan”), is hereby amended, effective as of the date this amendment is executed, in the following respects: 1. Sections 2.18 through 2.22 of the Plan are

Worldwide Code of Employee and Business Conduct**

of employee and business conduct Worldwide code WORLDWIDE CODE OF EMPLOYEE AND BUSINESS CODE OF CONDUCT Our Reputation for Integrity is a Priceless Asset ur ambition is to become the most inno- vative, go-to supplier for advanced alu- minium applications, and the safest and most exciting company to work for.

UNITED STATES

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number: 001-35931 Constellium SE

2024 Long Term Incentive Award Agreement, effective as of March 14, 2024**

2024 Long Term Incentive Award Agreement Terms and Conditions Effective as from March 14, 2024 2024 Award Agreement 2 1.

Description of Securities Registered under Section 12 of the Exchange Act**

1 Exhibit 4.1 DESCRIPTION OF SECURITIES REGISTERED UNDER SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of the ordinary shares and the Articles of Association of Constellium SE (“Constellium SE” or the “Company”) is a summary and does not purport to be complete. This summary is subject to, and qualified in its entirety by reference to, the complete text of the Company’

Indenture, dated as of August 8, 2024, among Constellium SE, the guarantors party thereto, Deutsche Bank Trust

EXECUTION VERSION CONSTELLIUM SE and certain Guarantors from time to time parties hereto $350,000,000 6.

List of subsidiaries**

Exhibit 21.1 Subsidiaries of Constellium SE as of December 31, 2024 Subsidiary Jurisdiction Alcan International Network México S.A. de C.V. Mexico AluInfra Services SA Switzerland Astrex Inc. Canada Constellium Automotive México, S. DE R.L. DE C.V. Mexico Constellium Automotive México Trading, S. DE R.L. DE C.V. Mexico Constellium Automotive (Nanjing) Co., Ltd. China Constellium Automotive Spain,

Constellium Neuf Brisach as Borrowers, Constellium International S.A.S., as Parent Company, the lenders party

Simmons & Simmons LLP 21 Rue De La Ville L’ Évêque 75008 Paris France T: +33 (0)1 53 29 16 29 F: +33 (0)1 53 29 16 30 17 FEBRUARY 2025 Sixth Amendment to the Inventory Financing Facility Agreement Sixième Avenant au Contrat de Crédit between: entre: Constellium Issoire and Constellium Neuf Brisach as Borrowers Constellium International as Parent Company Factofrance as Arranger and Agent The Financ

Offer Letter between the Company and Ryan Jurkovic, dated September 13, 2016**

Constellium US Holdings I, LLC U.S. Nonqualified Deferred Compensation and Restoration Plan Amendment

Page 1 CONSTELLIUM U.S. HOLDINGS I, LLC U.S. NONQUALIFIED DEFERRED COMPENSATION AND RESTORATION PLAN Amendment No. 2 Section 9.1 of the Constellium US Holdings I, LLC U.S. Nonqualified Deferred Compensation and Restoration Plan, effective as of January 1, 2019, as amended by the First Amendment to such plan, effective as of October 14, 2021 (as amended, the “Plan”) allows Constellium US Holdings I

Form of 2024 Long Term Incentive Award Letter for a grant of Restricted Stock Units and Performance Share

2024 LTIP Award Letter Last Name, First Name March XX, 2024 FORM 2024 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

Indenture, dated as of August 8, 2024, among Constellium SE, the guarantors party thereto and Deutsche Bank

EXECUTION VERSION CONSTELLIUM SE and certain Guarantors from time to time parties hereto €300,000,000 5.

Form of 2024 Long Term Incentive Award Letter for a grant of Restricted Stock Units**

2024 LTIP Award Letter Last Name, First Name March XX, 2024 FORM 2024 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

Philippe Hoffmann Employment contact and amendment to employment contract**

[ENGLISH LANGUAGE TRANSLATION OF ORIGINAL SIGNED DOCUMENTS] Employment contract Between Constellium Valais SA (hereinafter referred to as the employer) and Mr.

Amendment No. 7 to Amended and Restated Credit Agreement, by and among Constellium Muscle Shoals LLC, Constellium Rolled Products Ravenswood, LLC, Constellium Bowling Green LLC, Constellium Holdings Muscle Shoals LLC, Constellium US Holdings I, LLC, Constellium US Intermediate Holdings LLC, the lenders signatory thereto, and Wells Fargo Bank, National Association, as Administrative Agent and Collateral Agent, dated as of August 22, 2024 (incorporated by reference to Exhibit 10.54 of Constellium SE’s Annual Report on Form 10-K filed on February 28, 2025, File No. 001-35931)

[Execution] 8024049.9 AMENDMENT NO. 7 TO AMENDED AND RESTATED CREDIT AGREEMENT This AMENDMENT NO. 7 TO AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment No. 7”), dated as of August 22, 2024, by and among Constellium Muscle Shoals LLC, a Delaware limited liability company (f/k/a Wise Alloys LLC) (“Muscle Shoals”), Constellium Rolled Products Ravenswood, LLC, a Delaware limited liability compan

Fourth Quarter and Full Year 2024 Earnings Call February 20, 2025 Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including Adjusted EBITDA, Free Cash Flow, Adjusted NOPAT, Invested Capital, Adj

Fourth Quarter and Full Year 2024 Earnings Call February 20, 2025 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995.

February 20, 2025 Constellium Reports Fourth Quarter and Full Year 2024 Results; Establishes New Long-Term Targets

Exhibit 99.1 February 20, 2025 Constellium Reports Fourth Quarter and Full Year 2024 Results; Establishes New Long-Term Targets Paris - Constellium SE (NYSE: CSTM) (“Constellium” or the “Company”) today reported results for the fourth quarter and full year ended December 31, 2024. On January 15, 2025, the Company announced that, while it remains a foreign private issuer under applicable rules, it

Financial Statements and Exhibits, Results of Operations and Financial Condition

8-K 1 ef200438818k.htm 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 20, 2025 Constellium SE (Exact name of registrant as specified in its charter) France 001-35931 Not Applicable (State or Other Jurisdiction of Inco

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 15, 2025 Constellium SE (Exact name of registrant as specified in its charter) France 001-35931 Not Applicable (State or Other Jurisdiction of Incorporation) (Commission File

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Exhibit 99.1 PRESS RELEASE January 15, 2025 Constellium to Voluntarily Transition to Reporting in U.S. Dollars Under U.S. GAAP; Will Begin Filing Annual Reports on Form 10-K Paris – Constellium SE (NYSE: CSTM) ("Constellium" or the "Company") announced today that, while it remains a foreign private issuer under applicable rules, it intends to voluntarily file its SEC reports on U.S. domestic issue

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-35

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Par

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Exhibit 99.1 October 23, 2024 Constellium Reports Third Quarter 2024 Results Paris - Constellium SE (NYSE: CSTM) (“Constellium” or the “Company”) today reported results for the third quarter ended September 30, 2024. As a reminder of the press release issued on February 21, 2024 and following the SEC comment letter review process, Constellium will no longer report Value-Added Revenue (VAR), a Non-

Third Quarter 2024 Earnings Call October 23, 2024

Exhibit 99.2 Third Quarter 2024 Earnings Call October 23, 2024 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and ou

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-359

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of August 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Pari

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EX-99.1 2 d848198dex991.htm EX-99.1 Exhibit 99.1 August 27, 2024 Constellium to Appoint Bradley L. Soultz as Special Advisor to the Board of Directors Paris – Constellium SE (NYSE: CSTM) today announced that Mr. Bradley L. Soultz will be appointed as Special Advisor to the Board of Directors in September 2024. The Board expects to put forward the nomination of Mr. Soultz as a Non-Executive Directo

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Exhibit 99.1 July 25, 2024 Constellium Prices Company’s Notes Offering Paris, July 25, 2024 – Constellium SE (NYSE: CSTM) (“Constellium” or the “Company”) announced today that the Company has priced a private offering (the “Notes Offering”) of €300 million of euro denominated senior unsecured notes due 2032 (the “Euro Notes”) and $350 million of U.S. dollar denominated senior unsecured notes due 2

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

IMPORTANT INFORMATION AND CAUTIONARY STATEMENT REGARDING FORWARD- LOOKING STATEMENTS

Exhibit 99.2 IMPORTANT INFORMATION AND CAUTIONARY STATEMENT REGARDING FORWARD- LOOKING STATEMENTS This offering memorandum contains “forward-looking statements” with respect to our business, results of operations and financial condition, and our expectations or beliefs concerning future events and conditions. You can identify certain forward-looking statements because they contain words such as, b

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Exhibit 99.1 July 24, 2024 Constellium Launches Proposed Senior Notes Offering Paris, July 24, 2024 – Constellium SE (NYSE: CSTM) (“Constellium” or the “Company”) announced today the commencement of a proposed private offering of approximately €300 million of euro denominated senior unsecured notes due 2032 (the “Euro Notes”) and $350 million of U.S. dollar denominated senior unsecured notes due 2

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including Adjusted EBITDA, Free Cash Flow and Net debt. These measures are presented because management uses this information to monitor and evalu

Second Quarter 2024 Earnings Call July 23, 2024 Exhibit 99.2 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and our

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Constellium SE Second Quarter Report 2024 INDEX Page Management's discussion and analysis of financial condition and results of operations 3 Constellium SE Unaudited Interim Condensed Consolidated Financial Statements at June 30, 2024 and December 31, 2023 and for the six months ended June 30, 2024 and 2023 F-1 References to “tons” throughout this quarterly report are to metric tons and to “kt” to thousands of metric tons.

1

Exhibit 99.1 July 23, 2024 Constellium Reports Second Quarter and First Half 2024 Results Paris - Constellium SE (NYSE: CSTM) (“Constellium” or the “Company”) today reported results for the second quarter ended June 30, 2024. As a reminder of the press release issued on February 21, 2024 and following the SEC comment letter review process, Constellium will no longer report Value-Added Revenue (VAR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number 001-35931 Constellium SE (Translation of Registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris B

1

Exhibit 99.1 July 3, 2024 Constellium Facilities Impacted by Severe Flooding in Chippis and Sierre Paris – Constellium SE (NYSE: CSTM) announced today that its facilities in Sierre and Chippis in Switzerland were impacted by exceptional flooding from the Rhone River. All operations are currently suspended. We are relieved to report that all employees are safe. Constellium cannot assess at this poi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

CSTM / Constellium SE / Bpifrance Participations SA - SC 13D/A Activist Investment

SC 13D/A 1 tm2416635d1sc13da.htm SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 5 )* Constellium SE (Name of Issuer) Ordinary Shares, nominal value €0.02 per share (Title of Class of Securities) F21107101 (CUSIP Number) Sophie Paquin Bpifrance Participations S.A. 6-8, boulevard Haussmann 75009 P

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 Not applicable (State or Other Jurisdiction of Incorporat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 Not applicable (State or Other Jurisdiction of Incorporation or Organization) (Commission File Number) (I.R.S. Employer Identification No.) Washington Plaza, 40-44 rue Washington 75008 Paris France (Head Off

Filing Fee Table*

Exhibit 107 Calculation of Filing Fee Table Form S-8 Constellium SE Table 1: Newly Registered Securities Security Type  Security Class Title Fee Calculation Rule Amount Registered(1) Proposed Maximum Offering Price Per Unit(2) Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee(3) Equity Ordinary shares, nominal value €0.

As filed with the Securities and Exchange Commission on May 16, 2024

As filed with the Securities and Exchange Commission on May 16, 2024 Registration No.

CONSTELLIUM SE 2024 ANNUAL GENERAL MEETING VOTING RESULTS Total Shares Outstanding: 145,832,473 Total Shares Voted: 127,155,122 Total % of Shares Voted: 87.19% PROPOSALS / RESOLUTIONS TOTAL SHARES VOTED FOR TOTAL SHARES VOTED AGAINST ABSTENTIONS Reso

Exhibit 99.1 CONSTELLIUM SE 2024 ANNUAL GENERAL MEETING VOTING RESULTS Total Shares Outstanding: 145,832,473 Total Shares Voted: 127,155,122 Total % of Shares Voted: 87.19% PROPOSALS / RESOLUTIONS TOTAL SHARES VOTED FOR TOTAL SHARES VOTED AGAINST ABSTENTIONS Resolution 1 Re-appointment of Mr. Jean-Christophe DesLarzes as a director for a term of 3 yrs 124,779,828 2,338,167 37,127 Resolution 2 Re-a

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris Ba

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including Adjusted EBITDA, Free Cash Flow and Net debt. These measures are presented because management uses this information to monitor and evalu

First Quarter 2024 Earnings Call April 24, 2024 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and our expectations or beliefs con

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2024 Commission File Number: 001-3593

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

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Exhibit 99.1 Constellium Reports First Quarter 2024 Results Paris, April 24, 2024 – Constellium SE (NYSE: CSTM) (“Constellium” or the “Company”) today reported results for the first quarter ended March 31, 2024. As a reminder of the press release issued on February 21, 2024 and following the SEC comment letter review process, Constellium will no longer report Value-Added Revenue (VAR), a Non-GAAP

Constellium posts 2024 Annual General Meeting Materials

Exhibit 99.1 Constellium posts 2024 Annual General Meeting Materials Paris, April 12, 2024 – Constellium SE (NYSE: CSTM) (the “Company”) today announced that the notice and agenda and other documents for the Company’s Annual General Meeting of Shareholders to be held on May 2, 2024, at 5 PM CET (11 AM EDT), are available on its website at https://www.constellium.com/investors/shareholder-meetings

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2024 Commission File Number: 001-3593

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

Articles of Association of Constellium SE, dated April 10, 2023

Exhibit 3.1 TRANSLATION FROM FRENCH INTO ENGLISH (solely for convenience of English speaking users) CONSTELLIUM SE A European company with share capital of €2,936,397.68 Registered Office: Washington Plaza, 40-44 rue Washington, 75008 Paris Paris Trade and Companies Register n° 831 763 743 ARTICLES OF ASSOCIATION (as of April 10, 2023) TITLE I FORM, NAME, OBJECT, REGISTERED OFFICE, AND DURATION OF

Calculation of Filing Fee Table

Exhibit 107.1 Calculation of Filing Fee Table Form F-3 (Form Type) Constellium SE (Exact Name of Registrant as Specified in Its Charter) TABLE 1—NEWLY REGISTERED AND CARRY FORWARD SECURITIES(1) Security Type Security Class Title Fee Calculation or Carry Forward Rule Amount Registered Proposed Maximum  Offering Price Per Unit Maximum  Aggregate Offering Price Fee Rate  Amount of Registration  Fee C

As publicly filed with the Securities and Exchange Commission on March 20, 2024

Table of Contents As publicly filed with the Securities and Exchange Commission on March 20, 2024 Registration No.

Form of 2023 Long Term Incentive Award Letter for a grant of Restricted Stock Units**

2023 LTIP Award Letter Last Name, First Name March 15, 2023 FORM 2023 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

Description of Securities Registered under Section 12 of the Exchange Act**

1 Exhibit 2.1 DESCRIPTION OF SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of the ordinary shares and the Articles of Association of Constellium SE (“Constellium SE” or the “Company”) is a summary and does not purport to be complete. This summary is subject to, and qualified in its entirety by reference to, the complete text of the Co

Form of 2023 Long Term Incentive Award Letter for a grant of Restricted Stock Units and Performance Share Units**

2023 LTIP Award Letter Last Name, First Name March 15, 2023 FORM 2023 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

Articles of Association of Constellium SE dated April

TRANSLATION FROM FRENCH INTO ENGLISH (solely for convenience of English speaking users) CONSTELLIUM SE A European company with share capital of €2,936,397.

among Constellium Issoire, Constellium Neuf Brisach, Constellium Extrusions France, as Sellers, Constellium International S.A.S., as Parent Company, Constellium Switzerland A.G., as Sellers' agent, and Factofrance SA, as Factor, dated as of May 31, 2023**

Employment Agreement with Jack Guo dated March 31, 2023**

List of subsidiaries**

Exhibit 21.1 Subsidiaries of Constellium SE as of December 31, 2023 Subsidiary Jurisdiction Alcan International Network México S.A. de C.V. Mexico AluInfra Services SA Switzerland Astrex Inc. Canada Constellium Automotive México, S. DE R.L. DE C.V. Mexico Constellium Automotive México Trading, S. DE R.L. DE C.V. Mexico Constellium Automotive (Nanjing) Co., Ltd. China Constellium Automotive Spain,

Release Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Extrusions Deustchland GmbH, dated August 31, 2023**

Insider Trading Policy, dated as of December 2019

INSIDER TRADING POLICY CONSTELLIUM SE December 2019 (2) 1. INTRODUCTION The United States federal securities laws, Luxembourg securities laws, French securities laws and this Insider Trading Policy prohibit any executive and non-executive members of the Board of Directors, any Executive Officer, or any employee of the Company or its subsidiaries, from purchasing or selling Financial Instruments wh

Certification by Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated as of March

exhibit1222023section30 Exhibit 12.2 Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Jack Guo, certify that: 1. I have reviewed this annual report on Form 20-F of Constellium SE (the “Company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make t

Clawback/Compensation Recovery Policy

1 November 23, 2023 CONSTELLIUM SE CLAWBACK/COMPENSATION RECOVERY POLICY EFFECTIVE AS OF OCTOBER 2, 2023 The Board of Directors (the “Board”) of Constellium SE (the “Company”) has adopted this Clawback/Compensation Recovery Policy (this “Policy”) in accordance with Section 303A.

Borrowers, Constellium International S.A.S., as Parent Company, the lenders party thereto, and Factofrance, as

1 Paris 18365258.6 27 March 2023 / 27 mars 2023 CONSTELLIUM ISSOIRE and / et CONSTELLIUM NEUF BRISACH as Borrowers / les Emprunteurs CONSTELLIUM INTERNATIONAL as Parent Company / la Société-Mère FACTOFRANCE as Arranger and Agent / l’Arrangeur et Agent THE FINANCIAL INSTITUTIONS LISTED IN SCHEDULE 1 / LES INSTITUTIONS FINANCIERES LISTEES EN ANNEXE 1 as Lenders / les Prêteurs FIFTH AMENDMENT TO THE

Certification by Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated as of March

exhibit1312023section90 Exhibit 13.1 Certification by the Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Constellium SE (the “Company”) on Form 20-F for the year ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jean-Marc Germain, Chief Executive Officer of th

Certification by Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated as of March

exhibit1322023section90 Exhibit 13.2 Certification by the Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Constellium SE (the “Company”) on Form 20-F for the year ended December 31, 2023 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jack Guo, Chief Financial Officer of the Company

2023 Long Term Incentive Award Agreement, effective as of March 9, 2023 (incorporated by reference to

2023 Long Term Incentive Award Agreement Terms and Conditions Effective as from March 9, 2023 2023 Award Agreement 2 1.

Form 20-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT O

Certification by Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated as of March

exhibit1212023section30 Exhibit 12.1 Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Jean-Marc Germain, certify that: 1. I have reviewed this annual report on Form 20-F of Constellium SE (the “Company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary

Separation and Release of Claims Agreement with Peter R. Matt, effective April 8, 2023**

SEPARATION AND RELEASE OF CLAIMS AGREEMENT This Separation and Release of Claims Agreement (“Agreement”) is entered into as of the date last written below between Peter R.

Amendment No. 5 to the Constellium SE 2013 Equity Incentive Plan

AMENDMENT NO. 5 TO THE CONSTELLIUM SE 2013 EQUITY INCENTIVE PLAN WHEREAS, Constellium SE, a French Societas Europaea (the “Company”), has adopted the Constellium SE 2013 Equity Incentive Plan (the “Plan”); WHEREAS, the Board of Directors of the Company (the “Board”) approved the extension of the Plan for an indefinite term (unless the Board determines otherwise) and the amendment of the Plan so th

2023 (incorporated by reference to Exhibit 10.37 of Constellium SE's Form 20-F filed on March 18, 2024, File

EXECUTION VERSION Constellium: Third Omnibus Amendment 756361753 THIRD OMNIBUS AMENDMENT This THIRD OMNIBUS AMENDMENT, dated as of September 15, 2023 (this “Amendment”) is: (1) THE THIRD AMENDMENT to the RECEIVABLES SALE AGREEMENT, between Constellium Muscle Shoals LLC, as seller (the “RSA Seller”) and Constellium Muscle Shoals Funding III LLC, as purchaser (the “RSA Purchaser”); and (2) THE THIRD

Consent of Independent Registered Public Accounting Firm**

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

dated July 24, 2023 (incorporated by reference to Exhibit 10.42 of Constellium SE's Form 20-F filed on March

Constellium Constellium Switzerland AG Max Högger-Strasso 6 CH-8048 Zürich Swtzerland T441 (0) 44 438 66 00 ww constellumcom Personal/Confidential Ms.

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VIA EDGAR March 1, 2024 U.S. Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, N.W. Washington, DC 20549 Attn: Ms. Eiko Yaoita Pyles and Mr. Andrew Blume Re: Constellium SE Form 20-F for the fiscal year ended December 31, 2022 Filed March 14, 2023 Form 6-K furnished July 26, 2023 File No. 001-35931 Dear Ms. Pyles and Mr. Blume: Set forth below

For the years ended December 31, (in millions of Euros) 2023 2022 2021 2020 2019 Net income 129 308 262 (17 ) 64 Income tax expense / (benefit) 67 (105 ) 55 (17 ) 18 Income before tax 196 203 317 (34 ) 82 Finance costs - net 141 131 167 159 175 Share

Exhibit 99.1 Constellium Reports Fourth Quarter and Full Year 2023 Results; Announces $300 Million Share Repurchase Program Paris, February 21, 2024 – Constellium SE (NYSE: CSTM) (“Constellium” or the “Company”) today reported results for the fourth quarter and full year ended December 31, 2023. Fourth quarter 2023 highlights: • Shipments of 336 thousand metric tons, down 9% compared to Q4 2022 •

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2024 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Pa

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including VAR, Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow, Adjusted NOPAT, Invested Capital, Adjusted ROIC and Net debt. Thes

Fourth Quarter and Full Year 2023 Earnings Call February 21, 2024 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and our expectati

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VIA EDGAR December 20, 2023 U.S. Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, N.W. Washington, DC 20549 Attn: Ms. Eiko Yaoita Pyles and Mr. Andrew Blume Re: Constellium SE Form 20-F for the fiscal year ended December 31, 2022 Filed March 14, 2023 Form 6-K furnished July 26, 2023 File No. 001-35931 Dear Ms. Pyles and Mr. Blume: Set forth b

Washington Plaza

Washington Plaza 40-44 Rue Washington 75008 Paris FRANCE T + 1 443 420 7861 [email protected] November 29, 2023 Via Edgar U.S. Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing Washington, DC 20549 Attn: Ms. Eiko Yaoita Pyles Mr. Andrew Blume Re: Constellium SE (the “Company”) Form 20-F for the fiscal year ended December 31, 2022 Filed March 14, 20

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VIA EDGAR October 30, 2023 U.S. Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing 100 F Street, N.W. Washington, DC 20549 Attn: Ms. Eiko Yaoita Pyles and Mr. Andrew Blume Re: Constellium SE Form 20-F for the fiscal year ended December 31, 2022 Filed March 14, 2023 Form 6-K furnished February 22, 2023 Form 6-K furnished July 26, 2023 File No. 001-35931 Dear

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Exhibit 99.1 Constellium Reports Third Quarter 2023 Results Paris, October 25, 2023 – Constellium SE (NYSE: CSTM) today reported results for the third quarter ended September 30, 2023. Third quarter 2023 highlights: • Shipments of 369 thousand metric tons, down 5% compared to Q3 2022 • Revenue of €1.7 billion, down 15% compared to Q3 2022 • Value-Added Revenue (VAR) of €704 million, up 5% compared

Third Quarter 2023 Earnings Call October 25, 2023

Exhibit 99.2 Third Quarter 2023 Earnings Call October 25, 2023 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and ou

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 Commission File Number: 001-35

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 40-44 rue Washington 75008 Paris France (Head Office) 300 East Lo

Constellium completes the sale of its Landau, Crailsheim and Burg facilities

EX-99.1 Exhibit 99.1 Constellium completes the sale of its Landau, Crailsheim and Burg facilities Paris, October 04, 2023 – Constellium (NYSE: CSTM) announced today the completion of the sale of three of its soft alloy extrusion facilities located in Landau, Crailsheim and Burg in Germany to Vaessen Aluminium, for a total cash consideration of €48.8 million. This announcement follows the completio

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 Commission File Number: 001-35

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 40-44 rue Washington 75008 Paris France (Head Office) 300 Eas

Washington Plaza

Washington Plaza 40-44 Rue Washington 75008 Paris FRANCE T + 1 443 420 7861 [email protected] October 4, 2023    Via Edgar U.S. Securities and Exchange Commission Division of Corporation Finance Office of Manufacturing Washington, DC 20549 Attn: Ms. Eiko Yaoita Pyles Re: Constellium SE (the “Company”) Form 20-F for the fiscal year ended December 31, 2022 Filed March 14, 2023 Form 6-K furn

FR:CSTM / Constellium SE / Bpifrance Participations SA - SC 13D/A Activist Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 4 )* Constellium SE (Name of Issuer) Ordinary Shares, nominal value €0.02 per share (Title of Class of Securities) F21107101 (CUSIP Number) Sophie Paquin Bpifrance Participations S.A. 6-8, boulevard Haussmann 75009 Paris France +33 1 53 89 55 73 With copy to

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 Commission File Number 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 Commission File Number 001-35931 Constellium SE (Translation of Registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris B

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Constellium SE Second Quarter Report 2023 INDEX Page Management's discussion and analysis of financial condition and results of operations 3 Constellium SE Unaudited Interim Condensed Consolidated Financial Statements at June 30, 2023 and December 31, 2022 and for the six months ended June 30, 2023 and 2022 F-1 2 MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

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EX-99.1 Exhibit 99.1 Constellium Reports Second Quarter and First Half 2023 Results Paris, July 26, 2023 – Constellium SE (NYSE: CSTM) today reported results for the second quarter ended June 30, 2023. Second quarter 2023 highlights: • Shipments of 398 thousand metric tons, down 6% compared to Q2 2022 • Revenue of €2.0 billion, down 14% compared to Q2 2022 • Value-Added Revenue (VAR) of €785 milli

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including VAR, Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses

EX-99.2 Exhibit 99.2 Second Quarter 2023 Earnings Call July 26, 2023 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition,

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 Commission File Number: 001-35931

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Pa

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EX-99.1 Exhibit 99.1 Constellium to Sell Three German Extrusion Plants to Vaessen Aluminium Paris, July 18, 2023 – Constellium SE (NYSE: CSTM) today announced that it signed a binding agreement with Vaessen Aluminium for the sale of three of Constellium’s soft alloy extrusion facilities located in Landau, Crailsheim and Burg in Germany for a total cash consideration of €48.8 million. With nearly 4

Constellium Announces Partial Redemption of 5.875% Senior Notes due 2026

EX-99.1 Exhibit 99.1 Constellium Announces Partial Redemption of 5.875% Senior Notes due 2026 Paris, June 20, 2023 – Constellium SE (NYSE: CSTM) (“Constellium” or the “Company”) today announced that it has called for redemption $50,000,000 of the $300,000,000 outstanding aggregate principal amount of its 5.875% Senior Notes due 2026 (the “Notes”, and the redemption thereof, the “Redemption”), purs

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2023 Commission File Number: 001-35931

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2023 Commission File Number: 001-35931 Constellium SE (Translation of Registrant’s name into English) Washington Plaza, 40-44 rue Washington 75008 Paris France (Head Office) 300 East L

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2023 Commission File Number: 001-35931

6-K 1 d455659d6k.htm 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza 300 East Lombard Street 40-44 rue Washington

CONSTELLIUM SE 2023 ANNUAL GENERAL MEETING VOTING RESULTS Total Shares Outstanding: 146,819,884 Total Shares Voted: 125,187,736 Total % of Shares Voted: 85.27% PROPOSALS / RESOLUTIONS TOTAL SHARES VOTED FOR TOTAL SHARES VOTED AGAINST ABSTENTIONS Reso

EX-99.1 Exhibit 99.1 CONSTELLIUM SE 2023 ANNUAL GENERAL MEETING VOTING RESULTS Total Shares Outstanding: 146,819,884 Total Shares Voted: 125,187,736 Total % of Shares Voted: 85.27% PROPOSALS / RESOLUTIONS TOTAL SHARES VOTED FOR TOTAL SHARES VOTED AGAINST ABSTENTIONS Resolution 1 Re-appointment of Mr. Jean-Marc Germain as a director for a term of 3 yrs 124,831,367 315,467 40,902 Resolution 2 Re-app

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 Not applicable (State or Other Jurisdiction of Incorporat

SD UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 Not applicable (State or Other Jurisdiction of Incorporation or Organization) (Commission File Number) (I.R.S. Employer Identification No.) Washington Plaza, 40-44 rue Washington 75008 Paris France (Head

Constellium posts Annual General Meeting Materials

EX-99.1 Exhibit 99.1 Constellium posts Annual General Meeting Materials Paris, May 24, 2023 – Constellium SE (NYSE: CSTM) (the “Company”) today announced that the notice and agenda and other documents for the Company’s Annual General Meeting of Shareholders to be held on June 8, 2023, at 5 PM CET (11 AM EDT), are available on its website at https://www.constellium.com/investors/shareholder-meeting

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2023 Commission File Number: 001-35931

6-K 1 d503693d6k.htm 6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 40-44 rue Washington 75008 Paris France 300

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EX-99.1 Exhibit 99.1 Constellium Reports First Quarter 2023 Results Paris, April 26, 2023 – Constellium SE (NYSE: CSTM) today reported results for the first quarter ended March 31, 2023. First quarter 2023 highlights: • Shipments of 389 thousand metric tons, down 3% compared to Q1 2022 • Revenue of €2.0 billion, down 1% compared to Q1 2022 • Value-Added Revenue (VAR) of €754 million, up 16% compar

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2023 Commission File Number: 001-3593

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 P

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including VAR, Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses

EX-99.2 First Quarter 2023 Earnings Call April 26, 2023 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and financial condition, and our expectations or bel

Amendment No. 6 to Amended and Restated Credit Agreement, by and among Constellium Muscle Shoals LLC, Constellium Rolled Products Ravenswood, LLC, Constellium Bowling Green LLC, Constellium Holdings Muscle Shoals LLC, Constellium US Holdings I, LLC, Constellium US Intermediate Holdings LLC, the lenders signatory thereto, and Wells Fargo Bank, National Association, as Administrative Agent and Collateral Agent, dated as of June 23, 2022

exhibit4467-amendmentno6 [Execution] 6974498.7 AMENDMENT NO. 6 TO AMENDED AND RESTATED CREDIT AGREEMENT This AMENDMENT NO. 6 TO AMENDED AND RESTATED CREDIT AGREEMENT (this “Amendment No. 6”), dated as of June 23, 2022, by and among Constellium Muscle Shoals LLC, a Delaware limited liability company (f/k/a Wise Alloys LLC) (“Muscle Shoals”), Constellium Rolled Products Ravenswood, LLC, a Delaware l

Articles of Association of Constellium SE dated

exhibit11-cstmseaoax4ap TRANSLATION FROM FRENCH INTO ENGLISH (solely for convenience of English speaking users) CONSTELLIUM SE A European company with share capital of €2,886,031.

List of subsidiaries**

exhibit211-2022cstmlisto Exhibit 21.1 Subsidiaries of Constellium SE as of December 31, 2022 Subsidiary Jurisdiction Alcan International Network México S.A. de C.V. Mexico AluInfra Services SA Switzerland Astrex Inc. Canada Constellium Automotive México, S. DE R.L. DE C.V Mexico Constellium Automotive México Trading, S. DE R.L. DE C.V. Mexico Constellium Automotive (Nanjing) Co., Ltd. China Conste

A.G., as Sellers’ agent, and Factofrance SA, as Factor, dated as of July 21, 2022 (incorporated by reference to

exhibit1028-cstmfactofr Paris 17846958.7 166 SIGNATORIES Made in Paris on 21 July 2022, In six (6) originals CONSTELLIUM INTERNATIONAL as Parent Company /s/ Arina Yemelyanova CONSTELLIUM NEUF BRISACH as Seller /s/ Arina Yemelyanova By: Arina Yemelyanova Title: Authorized signatory By: Arina Yemelyanova Title: Authorized signatory CONSTELLIUM ISSOIRE as Seller /s/ Arina Yemelyanova CONSTELLIUM EXTR

Description of Securities Registered under Section 12 of the Exchange Act**

exhibit212022descriptio 1 Exhibit 2.1 DESCRIPTION OF SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of the ordinary shares and the Articles of Association of Constellium SE (“Constellium SE” or the “Company”) is a summary and does not purport to be complete. This summary is subject to, and qualified in its entirety by reference to, the

Form of 2022 Long Term Incentive Award Letter for a grant of Restricted Stock Units (incorporated by reference to Exhibit 10.30.12 of Constellium SE's Form 20-F filed on March 14, 2023, File No. 001-35931)

exhibit103012-2022ltipl FORM 2022 LTIP Award Letter Last Name, First Name March 10, 2022 FORM 2022 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

(incorporated by reference to Exhibit 10.36 of Constellium SE's Form 20-F filed on March 14, 2023, File No.

exhibit1036-constelliumx EXECUTION VERSION Constellium: Second Omnibus Amendment 748283241 SECOND OMNIBUS AMENDMENT This SECOND OMNIBUS AMENDMENT, dated as of June 28, 2022 (this “Amendment”) is: (1) THE SECOND AMENDMENT to the RECEIVABLES SALE AGREEMENT, between Constellium Muscle Shoals LLC, as seller (the “RSA Seller”) and Constellium Muscle Shoals Funding III LLC, as purchaser; and (2) THE SEC

Certification by Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated as of March

exhibit132-2022cfocertif Exhibit 13.2 Certification by the Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Constellium SE (the “Company”) on Form 20-F for the year ended December 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Peter R. Matt, Chief Financial Officer of the C

Certification by Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated as of March

exhibit121-2022certifica Exhibit 12.1 Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Jean-Marc Germain, certify that: 1. I have reviewed this annual report on Form 20-F of Constellium SE (the “Company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary

Certification by Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated as of March

exhibit131-certification Exhibit 13.1 Certification by the Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Constellium SE (the “Company”) on Form 20-F for the year ended December 31, 2022 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jean-Marc Germain, Chief Executive Officer of t

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Extrusions Deustchland GmbH, dated June 30, 2022

EX-10.95 6 exhibit1095-constelliumx.htm EX-10.95

Form of 2022 Long Term Incentive Award Letter for a grant of Restricted Stock Units and Performance Share Units (incorporated by reference to Exhibit 10.30.13 of Constellium SE's Form 20-F filed on March 14, 2023, File No. 001-35931)

exhibit103013-2022ltipl FORM 2022 LTIP Award Letter Last Name, First Name March 10, 2022 FORM 2022 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 OR ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT O

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Valais S.A. Sierre, dated June 30, 2022

exhibit1084-constelliumx

2022 Long Term Incentive Award Agreement, effective as of March 10, 2022 (incorporated by reference to Exhibit 10.30.11 of Constellium SE's Form 20-F filed on March 14, 2023, File No. 001-35931)

exhibit103011-2022awarda 2022 Long Term Incentive Award Agreement Terms and Conditions Effective as from March 10, 2022 2022 Award Agreement 2 1.

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Extrusions Děčín s.r.o., dated June 30, 2022

exhibit10134-constellium

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Singen GmbH (formerly: Alcan Singen GmbH)Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Singen GmbH (formerly: Alcan Singen GmbH), dated June 30, 2022

exhibit10124-constellium

Consent of Independent Registered Public Accounting Firm**

exhibit151-2022pwcconsen CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Rolled Products Singen GmbH & Co. KG, dated June 30, 2022

exhibit10103-constellium

Certification by Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated as of March

exhibit122-2022certifica Exhibit 12.2 Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Peter R. Matt, certify that: 1. I have reviewed this annual report on Form 20-F of Constellium SE (the “Company”); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to

Fourth Quarter and Full Year 2022 Earnings Call February 22, 2023

EX-99.2 Exhibit 99.2 Fourth Quarter and Full Year 2022 Earnings Call February 22, 2023 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain “forward-looking statements” with respect to our business, results of operations and fin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2023 Commission File Number: 001-3

6-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 7500

Q4 2022 Q4 2021 Var. FY 2022 FY 2021 Var. Shipments (k metric tons) 254 272 (7 )% 1,089 1,104 (1 )% Revenue (€ millions) 1,008 1,037 (3 )% 4,664 3,698 26 % Adjusted EBITDA (€ millions) 71 88 (20 )% 326 344 (5 )% Adjusted EBITDA per metric ton (€) 278

EX-99.1 Exhibit 99.1 Constellium Reports Fourth Quarter and Full Year 2022 Results Paris, February 22, 2023 – Constellium SE (NYSE: CSTM) today reported results for the fourth quarter and full year ended December 31, 2022. Fourth quarter 2022 highlights: • Shipments of 368 thousand metric tons, down 5% compared to Q4 2021 • Revenue of €1.8 billion, up 8% compared to Q4 2021 • Value-Added Revenue (

Constellium to appoint Jack Guo as Chief Financial Officer following Peter Matt’s decision to leave the Company

Exhibit 99.1 Constellium to appoint Jack Guo as Chief Financial Officer following Peter Matt’s decision to leave the Company Paris, February 16, 2023 – Constellium SE (NYSE: CSTM) announced today that, following Peter Matt’s decision to leave the Company to pursue another career opportunity, Jack Guo will be appointed Chief Financial Officer, effective April 1st, 2023. “I am delighted that Peter i

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2023 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2023 Commission File Number: 001-35931 Constellium SE (Translation of registrant’s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Pa

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including VAR, Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses

Third Quarter 2022 Earnings Call October 26, 2022 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain ?forward-looking statements? with respect to our business, results of operations and financial condition, and our expectations or beliefs c

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2022 Commission File Number: 001-35

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2022 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Par

2

Exhibit 99.1 Constellium Reports Third Quarter 2022 Results Paris, October 26, 2022 ? Constellium SE (NYSE: CSTM) today reported results for the third quarter ended September 30, 2022. Third quarter 2022 highlights: ? Shipments of 387 thousand metric tons, down 2% compared to Q3 2021 ? Revenue of ?2.0 billion, up 27% compared to Q3 2021 ? Value-Added Revenue (VAR) of ?673 million, up 21% compared

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2022 Commission File Number 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2022 Commission File Number 001-35931 Constellium SE (Translation of Registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris B

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Constellium SE Second Quarter Report 2022 INDEX Page Management's discussion and analysis of financial condition and results of operations 3 Constellium SE Unaudited Interim Condensed Consolidated Financial Statements at June 30, 2022 and December 31, 2021 and for the three and six months ended June 30, 2022 and 2021 F-1 2 MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF

INDEX TO FINANCIAL STATEMENTS

INDEX TO FINANCIAL STATEMENTS Constellium SE Unaudited Interim Condensed Consolidated Financial Statements at June 30, 2022 and December 31, 2021, and for the three and six months ended June 30, 2022 and 2021.

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including VAR, Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses

Exhibit 99.2 Second Quarter 2022 Earnings Call July 27, 2022 Forward-Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain ?forward-looking statements? with respect to our business, results of operations and financial condition, and our

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2022 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2022 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 40-44 rue Washington 300 East Lombard Street Suite 1710 75008 Paris

2

Exhibit 99.1 Constellium Reports Second Quarter 2022 Results Paris, July 27, 2022 ? Constellium SE (NYSE: CSTM) today reported results for the second quarter ended June 30, 2022. Second quarter 2022 highlights: ? Shipments of 424 thousand metric tons, up 4% compared to Q2 2021 ? Revenue of ?2.3 billion, up 50% compared to Q2 2021 ? Value-Added Revenue (VAR) of ?704 million, up 22% compared to Q2 2

CONSTELLIUM SE 2022 ANNUAL ORDINARY GENERAL MEETING VOTING RESULTS Total Shares Outstanding: 144,301,592 Total Shares Voted: 119,061,570 Total % of Shares Voted: 82.50% PROPOSALS / RESOLUTIONS TOTAL SHARES VOTED FOR TOTAL SHARED VOTED AGAINST ABSTENT

Exhibit 99.1 CONSTELLIUM SE 2022 ANNUAL ORDINARY GENERAL MEETING VOTING RESULTS Total Shares Outstanding: 144,301,592 Total Shares Voted: 119,061,570 Total % of Shares Voted: 82.50% PROPOSALS / RESOLUTIONS TOTAL SHARES VOTED FOR TOTAL SHARED VOTED AGAINST ABSTENTIONS Resolution 1 Appointment of Mr. Emmanuel Blot as a director for a term of three years 118,950,108 76,075 35,387 Resolution 2 Re-appo

2

Exhibit 99.2 All voting items adopted at Constellium?s 2022 Shareholders? Annual Ordinary General Meeting Paris, June 21, 2022 ? Constellium SE (NYSE: CSTM) held its Shareholders? Annual Ordinary General Meeting (AGM) on June 10, 2022 in Paris, France. All voting items presented to the General Meeting were adopted, including the annual accounts for 2021 and the appointment of Directors. Mr. Emmanu

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2022 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2022 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris B

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 Not applicable (State or Other Jurisdiction of Incorporat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 Not applicable (State or Other Jurisdiction of Incorporation or Organization) (Commission File Number) (I.R.S. Employer Identification No.) Washington Plaza, 40-44 rue Washington 75008 Paris France (Head Off

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2022 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2022 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris B

Constellium posts Annual Ordinary General Meeting Materials

Exhibit 99.1 Constellium posts Annual Ordinary General Meeting Materials Paris, May 24, 2022 ? Constellium SE (NYSE: CSTM) (the ?Company?) today announced that the notice and agenda and other documents for the Company?s Annual Ordinary General Meeting of Shareholders to be held on June 10, 2022, at 16:00 CET (10:00 AM EDT), are available on its website at www.constellium.com and will be available

2

Exhibit 99.1 Constellium Reports First Quarter 2022 Results Paris, April 27, 2022 ? Constellium SE (NYSE: CSTM) today reported results for the first quarter ended March 31, 2022. First quarter 2022 highlights: ? Shipments of 401 thousand metric tons, up 4% compared to Q1 2021 ? Revenue of ?2.0 billion, up 48% compared to Q1 2021 ? Value-Added Revenue (VAR) of ?652 million, up 21% compared to Q1 20

Non-GAAP Measures This presentation includes information regarding certain non-GAAP financial measures, including VAR, Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses

First Quarter 2022 Earnings Call April 27, 2022 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain ?forward-looking statements? with respect to our business, results of operations and financial condition, and our expectations or beliefs con

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2022 Commission File Number: 001-3593

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2022 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

Topic Presenter Start Time Introduction/ Sustainability Jean-Marc Germain CEO 8:00AM P&ARP Peter Basten* BU President 8:40AM AS&I Philippe Hoffmann* BU President 9:05AM Break 9:30AM A&T Ingrid Joerg* BU President 9:45AM Finance Peter Matt EVP and CFO

Analyst Day Muscle Shoals, AL April 6, 2022 Exhibit 99.1 Important Information Forward Looking Statements Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain ?forward-looking statements? with respect to our business, results of operations and financial c

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2022 Commission File Number: 001-3593

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2022 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

Certification by Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated as of

Exhibit 12.1 Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Jean-Marc Germain, certify that: 1. I have reviewed this annual report on Form 20-F of Constellium SE (the ?Company?); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements m

Amendment No. 5 to Amended and Restated Credit Agreement, by and among Constellium Muscle Shoals LLC, Constellium Rolled Products Ravenswood, LLC, Constellium Bowling Green LLC, Constellium Holdings Muscle Shoals LLC, Constellium US Holdings I, LLC, Constellium Property and Equipment Company, LLC, the lenders signatory thereto, and Wells Fargo Bank, National Association, as Administrative Agent and Collateral Agent, dated as of December 3, 2021 (incorporated by reference to Exhibit 4.46.6 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

[Execution] 6714464.7 AMENDMENT NO. 5 TO AMENDED AND RESTATED CREDIT AGREEMENT This AMENDMENT NO. 5 TO AMENDED AND RESTATED CREDIT AGREEMENT (this ?Amendment No. 5?), dated as of December 3, 2021, by and among Constellium Muscle Shoals LLC, a Delaware limited liability company (f/k/a Wise Alloys LLC) (?Muscle Shoals?), Constellium Rolled Products Ravenswood, LLC, a Delaware limited liability compa

Description of Securities Registered under Section 12 of the Exchange Act**

1 Exhibit 2.1 DESCRIPTION OF SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of the ordinary shares and the Articles of Association of Constellium SE (?Constellium SE? or the ?Company?) is a summary and does not purport to be complete. This summary is subject to, and qualified in its entirety by reference to, the complete text of the Co

First Supplemental Indenture (3.750% Sustainability-Linked Senior Notes due 2029), dated as of December 3, 2021, among Constellium US Intermediate Holdings LLC and Deutsche Bank Trust Company Americas, as Trustee (incorporated by reference to Exhibit 4.51.1 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

FIRST SUPPLEMENTAL INDENTURE FIRST SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?) dated as of December 3, 2021, among CONSTELLIUM US INTERMEDIATE HOLDINGS LLC (col- lectively, the ?New Guarantor?), which is a subsidiary of CONSTELLIUM S.

Third Supplemental Indenture (5.875% Senior Notes due 2026), dated as of December 3, 2021, among Constellium US Intermediate Holdings LLC and Deutsche Bank Trust Company Americas, as Trustee (incorporated by reference to Exhibit 4.43.2 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

THIRD SUPPLEMENTAL INDENTURE THIRD SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?) dated as of December 3, 2021, among CONSTELLIUM US INTERMEDIATE HOLDINGS LLC (the ?New Guarantor?), which is a subsidiary of CONSTELLIUM S.

Consent of Independent Registered Public Accounting Firm**

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

Certification by Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated as of

Exhibit 13.1 Certification by the Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Constellium SE (the ?Company?) on Form 20-F for the year ended December 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the ?Report?), I, Jean-Marc Germain, Chief Executive Officer of the Company, certify, purs

Certification by Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated as of

Exhibit 13.2 Certification by the Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Constellium SE (the ?Company?) on Form 20-F for the year ended December 31, 2021 as filed with the Securities and Exchange Commission on the date hereof (the ?Report?), I, Peter R. Matt, Chief Financial Officer of the Company, certify, pursuant

Articles of Association of Constellium SE dated May 26, 2021

TRANSLATION FROM FRENCH INTO ENGLISH (solely for convenience of English speaking users) CONSTELLIUM SE A European company with share capital of ?2.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ☐ REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHA

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ? REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT O

Form of 2021 Long Term Incentive Award Letter for a grant of Restricted Stock Units and Performance Share Units (incorporated by reference to Exhibit 10.30.10 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

? FORM OF ? 2021 LTIP Award Letter Last Name, First Name May 11, 2021 2021 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

Third Supplemental Indenture (4.250% Senior Notes due 2026), dated as of December 3, 2021, among Constellium US Intermediate Holdings LLC and Deutsche Bank Trust Company Americas, as Trustee, Deutsche Bank AG, London Branch, as Principal Paying Agent and Deutsche Bank Luxembourg S.A., as Registrar and Transfer Agent (incorporated by reference to Exhibit 4.45.2 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

a4452thirdsupplindeurnot THIRD SUPPLEMENTAL INDENTURE THIRD SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”) dated as of December 3, 2021, among CONSTELLIUM US INTERMEDIATE HOLDINGS LLC (the “New Guarantor”), which is a subsidiary of CONSTELLIUM S.

First Supplemental Indenture (5.625% Senior Notes due 2028), dated as of December 3, 2021, among Constellium US Intermediate Holdings LLC and Deutsche Bank Trust Company Americas, as Trustee (incorporated by reference to Exhibit 4.49.1 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

a4491firstsupplind5625se FIRST SUPPLEMENTAL INDENTURE FIRST SUPPLEMENTAL INDENTURE (this “Supplemental Indenture”) dated as of December 3, 2021, among CONSTELLIUM US INTERMEDIATE HOLDINGS LLC (col- lectively, the “New Guarantor”), which is a subsidiary of CONSTELLIUM S.

First Omnibus Amendment to the Receivables Sale Agreement between Constellium Muscle Shoals LLC and Constellium Muscle Shoals Funding III LLC, and to the Receivables Purchase Agreement among Constellium Muscle Shoals Funding III LLC, Constellium Muscle Shoals LLC, Deutsche Bank Trust Company Americas, Deutsche Bank AG New York Branch, and Intesa Sanpaolo S.p.A., dated as of December 21, 2021 (incorporated by reference to Exhibit 10.35 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

EXECUTION VERSION Constellium: First Omnibus Amendment 745268061 FIRST OMNIBUS AMENDMENT This FIRST OMNIBUS AMENDMENT, dated as of December 21, 2021 (this ?Amendment?) is: (1) THE FIRST AMENDMENT to the RECEIVABLES SALE AGREEMENT, between Constellium Muscle Shoals LLC, as seller (the ?RSA Seller) and Constellium Muscle Shoals Funding III LLC, as purchaser; and (2) THE FIRST AMENDMENT to the RECEIV

First Supplemental Indenture (3.125% Sustainability-Linked Senior Notes due 2029), dated as of December 3, 2021, among Constellium US Intermediate Holdings LLC and Deutsche Bank Trust Company Americas, as Trustee, Deutsche Bank AG, London Branch, as Principal Paying Agent and Deutsche Bank Luxembourg S.A., as Registrar and Transfer Agent (incorporated by reference to Exhibit 4.52.1 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

FIRST SUPPLEMENTAL INDENTURE FIRST SUPPLEMENTAL INDENTURE (this ?Supplemental Indenture?) dated as of December 3, 2021, among CONSTELLIUM US INTERMEDIATE HOLDINGS LLC (collec- tively, the ?New Guarantor?), which is a subsidiary of CONSTELLIUM S.

Certification by Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated as of

Exhibit 12.2 Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Peter R. Matt, certify that: 1. I have reviewed this annual report on Form 20-F of Constellium SE (the ?Company?); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made,

Amendment No. 4 to Amended and Restated Credit Agreement, by and among Constellium Muscle Shoals LLC, Constellium Rolled Products Ravenswood, LLC, Constellium Bowling Green LLC, Constellium Holdings Muscle Shoals LLC, Constellium US Holdings I, LLC, Constellium Property and Equipment Company, LLC, the lenders signatory thereto, and Wells Fargo Bank, National Association, as Administrative Agent and Collateral Agent, dated as of April 27, 2021 (incorporated by reference to Exhibit 4.46.5 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

6508832.12 [Execution] AMENDMENT NO. 4 TO AMENDED AND RESTATED CREDIT AGREEMENT This AMENDMENT NO. 4 TO AMENDED AND RESTATED CREDIT AGREEMENT (this ?Amendment No. 4?), dated as of April 27, 2021, by and among Constellium Muscle Shoals LLC, a Delaware limited liability company (f/k/a Wise Alloys LLC) (?Muscle Shoals?), Constellium Rolled Products Ravenswood, LLC, a Delaware limited liability compan

Letter dated May 12, 2021 signed by Constellium International S.A.S. and BNP Paribas, as agent on behalf of lenders, having amended clause 21.17 of the Term Facility Agreement for a Loan Guaranteed by the French State (PGE Grande Entreprise), dated as of May 13, 2020, by and among Constellium International S.A.S., BNP Paribas, Bpifrance Financement and Société Générale (incorporated by reference to Exhibit 4.50.1 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

Constellium International 40-44, rue Washington 75008 Paris France Tel: +33 (1) 73 01 46 20 www.

Form of 2021 Long Term Incentive Award Letter for a grant of Restricted Stock Units (incorporated by reference to Exhibit 10.30.9 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

? FORM OF ? 2021 LTIP Award Letter Last Name, First Name May 11, 2021 2021 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

Receivables Purchase Agreement, among Constellium Muscle Shoals Funding III LLC, Constellium Muscle Shoals LLC, Deutsche Bank Trust Company Americas, Deutsche Bank AG New York Branch and Intesa Sanpaolo S.p.A., dated as of September 30, 2021 (incorporated by reference to Exhibit 10.33 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

a1033receivablespurchase EXECUTION VERSION 743430296 16500839 RECEIVABLES PURCHASE AGREEMENT This RECEIVABLES PURCHASE AGREEMENT (as it may be amended, modified or supplemented from time to time, this “Agreement”) is made as of September 30, 2021 among Constellium Muscle Shoals Funding III LLC, a Delaware limited liability company, in its capacity as seller hereunder (“Seller”), Constellium Muscle

List of subsidiaries**

Exhibit 21.1 Subsidiaries of Constellium SE as of December 31, 2021 Subsidiary Jurisdiction Alcan International Network M?xico S.A. de C.V. Mexico AluInfra Services SA Switzerland Astrex Inc. Canada Constellium Automotive M?xico, S. DE R.L. DE C.V Mexico Constellium Automotive M?xico Trading, S. DE R.L. DE C.V. Mexico Constellium Automotive (Nanjing) Co., Ltd. China Constellium Automotive Spain, S

Indenture, dated as of June 2, 2021, among Constellium SE, the guarantors party thereto, Deutsche Bank Trust Company Americas, as Trustee, Deutsche Bank AG, London Branch, as Principal Paying Agent and Deutsche Bank Luxembourg S.A., as Registrar and Transfer Agent, providing for the issuance of the 3.125% Sustainability-Linked Senior Notes due 2029 (incorporated by reference to Exhibit 4.52 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

Execution Version CONSTELLIUM SE and certain Guarantors from time to time parties hereto €300,000,000 3.

Receivables Sale Agreement, between Constellium Muscle Shoals LLC and Constellium Muscle Shoals Funding III LLC, dated as of September 30, 2021 (incorporated by reference to Exhibit 10.34 of Constellium SE's Form 20-F filed on March 14, 2022, File No. 001-35931)

EXECUTION VERSION 743429912 RECEIVABLES SALE AGREEMENT This RECEIVABLES SALE AGREEMENT (as it may be amended, modified or supplemented from time to time, this ?Agreement?) is made as of September 30, 2021, between Constellium Muscle Shoals LLC, a Delaware limited liability company (?Seller?) and Constellium Muscle Shoals Funding III LLC, a Delaware limited liability company (?Purchaser?).

2

EX-99.1 2 d264654dex991.htm EX-99.1 Exhibit 99.1 Constellium Reports Fourth Quarter and Full Year 2021 Results Paris, February 23, 2022 – Constellium SE (NYSE: CSTM) today reported results for the fourth quarter and full year ended December 31, 2021. Fourth quarter 2021 highlights: • Shipments of 385 thousand metric tons, up 3% compared to Q4 2020 • Revenue of €1.7 billion, up 37% compared to Q4 2

Non-GAAP measures This presentation includes information regarding certain non-GAAP financial measures, including Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses this

Fourth Quarter and Full Year 2021 Earnings Call February 23, 2022 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain ?forward-looking statements? with respect to our business, results of operations and financial condition, and our expectati

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2022 Commission File Number: 001-3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of February 2022 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Pa

Non-GAAP measures This presentation includes information regarding certain non-GAAP financial measures, including Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses this

Third Quarter 2021 Earnings Call October 27, 2021 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain ?forward-looking statements? with respect to our business, results of operations and financial condition, and our expectations or beliefs c

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 Commission File Number: 001-35

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Par

2

Exhibit 99.1 Constellium Reports Third Quarter 2021 Results Paris, October 27, 2021 ? Constellium SE (NYSE: CSTM) today reported results for the third quarter ended September 30, 2021. Third quarter 2021 highlights: ? Shipments of 395 thousand metric tons, up 12% compared to Q3 2020 ? Revenue of ?1.6 billion, up 35% compared to Q3 2020 ? Net income of ?99 million compared to a net income of ?20 mi

2

Exhibit 99.1 Constellium Announces Partial Redemption of 5.875% Senior Notes due 2026 Paris, October 26, 2021 ? Constellium SE (NYSE: CSTM) (?Constellium? or the ?Company?) today announced that it has called for redemption $200,000,000 of the $500,000,000 outstanding aggregate principal amount of its 5.875% Senior Notes due 2026 (the ?Notes?, and the redemption thereof, the ?Redemption?), pursuant

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 Commission File Number: 001-35

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 Commission File Number: 001-35931 Constellium SE (Translation of Registrant?s name into English) Washington Plaza, 40-44 rue Washington 75008 Paris France (Head Office) 300 East Lo

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 Commission File Number: 001-35

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of October 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Pari

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2021 Commission File Number 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2021 Commission File Number 001-35931 Constellium SE (Translation of Registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris B

INDEX TO FINANCIAL STATEMENTS

INDEX TO FINANCIAL STATEMENTS Constellium SE Unaudited Interim Condensed Consolidated Financial Statements at June 30, 2021 and 2020, and for the six months ended June 30, 2021 and 2020.

MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Constellium SE Second Quarter Report 2021 INDEX Page Management's discussion and analysis of financial condition and results of operations 3 Constellium SE Unaudited Interim Condensed Consolidated Financial Statements at June 30, 2021 and December 31, 2020 and for the three and six months ended June 30, 2021 and 2020 F-1 2 MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2021 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of July 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

2

Exhibit 99.1 Constellium Reports Second Quarter 2021 Results Paris, July 28, 2021 ? Constellium SE (NYSE: CSTM) today reported results for the second quarter ended June 30, 2021. Second quarter 2021 highlights: ? Shipments of 406 thousand metric tons, up 31% compared to Q2 2020 ? Revenue of ?1.5 billion, up 47% compared to Q2 2020 ? Net income of ?108 million compared to a net loss of ?32 million

Non-GAAP measures This presentation includes information regarding certain non-GAAP financial measures, including Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses this

Second Quarter 2021 Earnings Call July 28, 2021 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain ?forward-looking statements? with respect to our business, results of operations and financial condition, and our expectations or beliefs con

2

Exhibit 99.1 Constellium set to join Russell 3000? Index Paris, June 8, 2021 ? Constellium SE (NYSE: CSTM) is set to join the broad-market Russell 3000? Index at the conclusion of the 2021 Russell indexes annual reconstitution, effective after the U.S. market opens on June 28, 2021, according to a preliminary list of additions posted June 4, 2021. Annual Russell indexes reconstitution captures the

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2021 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of June 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 Not applicable (State or Other Jurisdiction of Incorporat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form SD SPECIALIZED DISCLOSURE REPORT CONSTELLIUM SE (Exact Name of Registrant as Specified in Charter) France 001-35931 Not applicable (State or Other Jurisdiction of Incorporation or Organization) (Commission File Number) (I.R.S. Employer Identification No.) Washington Plaza, 40-44 rue Washington 75008 Paris France (Head Off

2

Exhibit 99.2 All voting items adopted at Constellium?s 2021 Annual General Meeting of Shareholders Paris, May 18, 2021 ? Constellium SE (NYSE: CSTM) held its Annual General Meeting of Shareholders (AGM) on May 11, 2021 in Paris, France. All voting items presented to the General Meeting were adopted, including the annual accounts for 2020 and the election of directors. Mr. Michiel Brandjes (for a t

CONSTELLIUM SE 2021 ANNUAL GENERAL MEETING VOTING RESULTS Total Shares Outstanding: 139,983,347 Total Shares Voted: 104,775,780 Total % of Shares Voted: 74.84% PROPOSALS / RESOLUTIONS TOTAL SHARES VOTED FOR TOTAL SHARES VOTED AGAINST ABSTENTIONS Reso

Exhibit 99.1 CONSTELLIUM SE 2021 ANNUAL GENERAL MEETING VOTING RESULTS Total Shares Outstanding: 139,983,347 Total Shares Voted: 104,775,780 Total % of Shares Voted: 74.84% PROPOSALS / RESOLUTIONS TOTAL SHARES VOTED FOR TOTAL SHARES VOTED AGAINST ABSTENTIONS Resolution 1 Appointment of Ms. Isabelle Boccon-Gibod as a director for a term of three years 103,241,620 1,450,482 83,678 Resolution 2 Appoi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2021 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris Ba

2

Exhibit 99.1 Constellium Launches Proposed Sustainability-Linked Senior Notes Offering Paris, May 17, 2021 ? Constellium SE (NYSE: CSTM) (?Constellium? or the ?Company?) announced today the commencement of a proposed private offering of approximately ?300 million of euro denominated sustainability-linked senior unsecured notes due 2029 (the ?Sustainability-Linked Notes?), subject to market and oth

Recent Developments

Exhibit 99.2 Recent Developments Redemption of the 2024 Notes Substantially concurrently with the launch of this offering of the Notes, we intend to issue a notice of redemption for all of our outstanding 5.750% Senior Notes due 2024 (the ?2024 Notes?) (the ?Redemption?), with an expected redemption date of June 16, 2021 (the ?Redemption Date?), at a redemption price equal to 100.958% of the princ

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2021 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris B

2

Exhibit 99.1 Constellium Prices Company?s Sustainability-Linked Notes Offering Paris, May 17, 2021 ? Constellium SE (NYSE: CSTM) (?Constellium? or the ?Company?) today announced that the Company has priced a private offering (the ?Notes Offering?) of ?300 million of Euro denominated sustainability-linked senior unsecured notes due 2029 (the ?Sustainability-Linked Notes?). The Sustainability-Linked

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2021 Commission File Number: 001-35931

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 40-44 rue Washington 75008 Paris France 300 East Lombard Street Suite

As filed with the Securities and Exchange Commission on May 14, 2021

As filed with the Securities and Exchange Commission on May 14, 2021 Registration No.

Amendment No. 4 to the Constellium SE 2013 Equity Incentive Plan, effective as of May 14, 2021*

Exhibit 99.5 AMENDMENT NO. 4 TO THE CONSTELLIUM SE 2013 EQUITY INCENTIVE PLAN WHEREAS, Constellium SE, a French Societas Europaea (the ?Company?), has adopted the Constellium SE 2013 Equity Incentive Plan (the ?Plan?); WHEREAS, the Board of Directors of the Company (the ?Board?) and the shareholders of the Company previously approved an increase to the number of Class A ordinary shares, par value

Articles of Association of Constellium SE, dated May 11, 2021*

Exhibit 4.1 TRANSLATION FROM FRENCH INTO ENGLISH (solely for convenience of English speaking users) CONSTELLIUM SE A European company with share capital of ?2,799,911.68 Registered Office: Washington Plaza, 40-44 rue Washington, 75008 Paris Paris Trade and Companies Register n? 831 763 743 ARTICLES OF ASSOCIATION (as of May 11, 2021) TITLE I FORM, NAME, OBJECT, REGISTERED OFFICE, AND DURATION OF T

Current Report of Foreign Issuer - 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of May 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris Ba

2

Exhibit 99.1 Constellium Reports First Quarter 2021 Results Paris, April 28, 2021 ? Constellium SE (NYSE: CSTM) today reported results for the first quarter ended March 31, 2021. First quarter 2021 highlights: ? Shipments of 385 thousand metric tons, down 2% compared to Q1 2020 ? Revenue of ?1.3 billion, down 7% compared to Q1 2020 ? Net income of ?48 million compared to net loss of ?31 million in

Non-GAAP measures This presentation includes information regarding certain non-GAAP financial measures, including Adjusted EBITDA, Adjusted EBITDA per metric ton, Free Cash Flow and Net debt. These measures are presented because management uses this

First Quarter 2021 Earnings Call April 28, 2021 Exhibit 99.2 Certain statements contained in this presentation may constitute forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. This presentation may contain ?forward-looking statements? with respect to our business, results of operations and financial condition, and our expectations or beliefs con

Current Report of Foreign Issuer - 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

Constellium posts Annual General Meeting Materials

Exhibit 99.1 Constellium posts Annual General Meeting Materials Paris, April 21, 2021 ? Constellium SE (NYSE: CSTM) (the ?Company?) today announced that the notice and agenda and other documents for the Company?s Annual General Meeting of Shareholders to be held on May 11, 2021, at 16:00 CET (10:00 AM EDT), are available on its website at www.constellium.com and will be available free of charge at

Current Report of Foreign Issuer - 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of April 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza, 300 East Lombard Street 40-44 rue Washington Suite 1710 75008 Paris

Certification by Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated as of March 1

Exhibit 13.1 Certification by the Chief Executive Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Constellium SE (the ?Company?) on Form 20-F for the year ended December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the ?Report?), I, Jean-Marc Germain, Chief Executive Officer of the Company, certify, purs

Form of 2020 Long Term Incentive Award Letter for a grant of Restricted Stock Units (incorporated by reference to Exhibit 10.30.7 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

?FORM OF? 2020 LTIP Award Letter Last Name, First Name April 7, 2020 2020 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Extrusions Deustchland GmbH, dated April 30, 2020 (incorporated by reference to Exhibit 10.9.4 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

Certification by Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated as of March 1

Exhibit 12.1 Certification by the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Jean-Marc Germain, certify that: 1. I have reviewed this annual report on Form 20-F of Constellium SE (the ?Company?); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements m

Consent of Independent Registered Public Accounting Firm**

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Nos.

Certification by Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, dated as of March 1

Exhibit 13.2 Certification by the Chief Financial Officer Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 In connection with the Annual Report of Constellium SE (the ?Company?) on Form 20-F for the year ended December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the ?Report?), I, Peter R. Matt, Chief Financial Officer of the Company, certify, pursuant

- 20-F

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 20-F ? REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 OR ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT O

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Extrusions Děčín s.r.o., dated April 30, 2020 (incorporated by reference to Exhibit 10.13.3 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

as Borrowers, Constellium International S.A.S., as Parent Company, the lenders party thereto, and Factofrance, as

Term Facility Agreement for a Loan Guaranteed by the French State (PGE Grande Entreprise), dated as of May 13, 2020, by and among Constellium International S.A.S., BNP Paribas, Bpifrance Financement and Société Générale (incorporated by reference to Exhibit 4.50 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

07/1692735214 1 Execution version 13 May 2020 CONSTELLIUM INTERNATIONAL as Company and BNP PARIBAS as Coordinator and BNP PARIBAS BPIFRANCE FINANCEMENT SOCIETE GENERALE As Original Lenders and BNP PARIBAS as Agent and Security Agent EUR 180,000,000 TERM FACILITY AGREEMENT FOR A LOAN GUARANTEED BY THE FRENCH STATE (PGE GRANDE ENTREPRISE) Herbert Smith Freehills Paris LLP 07/1692735214 2 TABLE OF CONTENTS Clause Headings Page SECTION 1 INTERPRETATION .

Form of 2020 Long Term Incentive Award Letter for a grant of Restricted Stock Units and Performance Share Units (incorporated by reference to Exhibit 10.30.8 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

?FORM OF? 2020 LTIP Award Letter Last Name, First Name April 7, 2020 2020 Long Term Incentive Award Letter Dear First Name, I am pleased to inform you that you have received a Grant of Units in the amounts set forth below.

Amendment No. 3 to Amended and Restated Credit Agreement, by and among Constellium Muscle Shoals LLC, Constellium Rolled Products Ravenswood, LLC, Constellium Bowling Green LLC, Constellium Holdings Muscle Shoals LLC, Constellium US Holdings I, LLC, Constellium Property and Equipment Company, LLC, the lenders signatory thereto, and Wells Fargo Bank, National Association, as Administrative Agent and Collateral Agent, dated as of September 25, 2020 (incorporated by reference to Exhibit 4.46.4 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

3956191v2 [Execution] AMENDMENT NO. 3 TO AMENDED AND RESTATED CREDIT AGREEMENT This AMENDMENT NO. 3 TO AMENDED AND RESTATED CREDIT AGREEMENT (this ?Amendment No. 3?), dated as of September 25, 2020, by and among Constellium Muscle Shoals LLC, a Delaware limited liability company (f/k/a Wise Alloys LLC) (?Muscle Shoals?), Constellium Rolled Products Ravenswood, LLC, a Delaware limited liability com

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Rolled Products Singen GmbH & Co. KG, dated April 30, 2020 (incorporated by reference to Exhibit 10.10.2 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

Amendment and Restatement Agreement among Constellium Issoire, Constellium Neuf Brisach and Constellium Extrusions France, as Sellers, Constellium International S.A.S., as Parent Company, Constellium Switzerland A.G., as Sellers’ agent, and Factofrance SA, as Factor, dated as of May 26, 2020 (incorporated by reference to Exhibit 10.27 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Singen GmbH (formerly Alcan Singen GmbH)Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Singen GmbH (formerly Alcan Singen GmbH), dated April 30, 2020 (incorporated by reference to Exhibit 10.12.3 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

List of subsidiaries**

Subsidiaries of Constellium SE as of December 31, 2020 Subsidiary Jurisdiction Alcan International Network (Thailand) Co.

Description of Securities Registered under Section 12 of the Exchange Act**

1 Exhibit 2.1 DESCRIPTION OF SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934 The following description of the ordinary shares and the Articles of Association of Constellium SE (?Constellium? or the ?Company?) is a summary and does not purport to be complete. This summary is subject to, and qualified in its entirety by reference to, the complete text of the Compa

Amendment Agreement to a Factoring Agreement between TARGOBANK AG and Constellium Valais S.A. Sierre, dated April 30, 2020 (incorporated by reference to Exhibit 10.8.3 of Constellium SE's Form 20-F filed on March 17, 2021, File No. 001-35931)

Third Amendment to the Facility Agreement, by and among Constellium Issoire and Constellium Neuf Brisach, as Borrowers, Constellium International, as Parent Company, the lenders party thereto, and Factofrance, as Arranger and Agent, dated as of March 15, 2019

Certification by Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, dated as of March 1

Exhibit 12.2 Certification by the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 I, Peter R. Matt, certify that: 1. I have reviewed this annual report on Form 20-F of Constellium SE (the ?Company?); 2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made,

Current Report of Foreign Issuer - FORM 6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 6-K REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934 For the month of March 2021 Commission File Number: 001-35931 Constellium SE (Translation of registrant?s name into English) Washington Plaza 40-44, rue Washington 75008 Paris, France (Address of principal exec