2026 Form S-3 (CSTM)

As filed with the Securities and Exchange Commission on June 24, 2026.

Registration No. 333-

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM S-3

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933

Constellium SE

(Exact name of registrant as specified in its charter)


France		98-0667516
(State or other jurisdiction of incorporation or organization)		(I.R.S Employer Identification Number)

300 East Lombard Street,

Suite 1710

Baltimore, MD 21202

(443) 420-7861

(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

Corporation Service Company

80 State Street

Albany, NY 12207-2543

+1 (302) 636-5400

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Copies to:

Peter E. Devlin

Jones Day

250 Vesey Street

New York, NY 10281

(212) 326-3939

Approximate date of commencement of proposed sale to the public: From time to time after this registration

statement becomes effective.

If the only securities being registered on this form are being offered pursuant to dividend or interest

reinvestment plans, please check the following box. ☐

If any of the securities being registered on this form are to be offered on a delayed or continuous basis pursuant

to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or

interest reinvestment plans, check the following box. ☒

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities

Act, please check the following box and list the Securities Act registration statement number of the earlier effective

registration statement for the same offering. ☐

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If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the

following box and list the Securities Act registration statement number of the earlier effective registration statement

for the same offering. ☐

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment

thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities

Act, check the following box. ☒

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D.

filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities

Act, check the following box. ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated

filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,”

“accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange

Act.


Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended

transition period for complying with any new or revised financial accounting standards provided pursuant to Section

7(a)(2)(B) of the Securities Act. ☐

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EXPLANATORY NOTE

Constellium SE is filing this registration statement to replace its registration statement on Form F-3 (File

No. 333-278097), filed with the Securities and Exchange Commission on March 20, 2024 (the “Prior Registration

Statement”), because it determined on June 30, 2025 that it no longer qualified as a “foreign private issuer,” as

determined by Rule 405 under the Securities Act of 1933, as amended, and, as of January 1, 2026, became

ineligible to use the Prior Registration Statement.

PROSPECTUS

Ordinary Shares

Constellium SE

(a Societas Europaea domiciled in France)

__________________________

Constellium SE may from time to time offer to sell our ordinary shares, nominal value €0.02 per share,

which we refer to as the “shares” or the “ordinary shares.” Our ordinary shares are listed on the New York Stock

Exchange under the symbol “CSTM.”

From the date of this prospectus, we may offer ordinary shares from time to time in amounts, at prices and

on terms determined by market conditions at the time of the offering. We may sell or otherwise transfer the ordinary

shares directly or alternatively through underwriters, broker-dealers or agents we select. If we use underwriters,

broker-dealers or agents to sell or transfer the ordinary shares, then we will name them and describe their

compensation in a prospectus supplement. For more information regarding the sales or transfers of ordinary shares

pursuant to this prospectus, please read “Plan of Distribution.”

Investing in our ordinary shares involves risks. Please carefully consider the “Risk Factors” in “Item 1A.

Risk Factors” of our most recent Annual Report on Form 10-K incorporated by reference in this prospectus and the

“Risk Factors” section in any applicable prospectus supplement, for a discussion of the factors you should consider

carefully before deciding to purchase these securities.

Neither the U.S. Securities and Exchange Commission nor any state securities commission has

approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any

representation to the contrary is a criminal offense.

__________________________

The date of this prospectus is June 24, 2026.


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TABLE OF CONTENTS

Page


ABOUT THIS PROSPECTUS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	1
SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	2
RISK FACTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS . . . . . . . . .	4
USE OF PROCEEDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	5
DESCRIPTION OF CAPITAL STOCK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	6
PLAN OF DISTRIBUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	36
LEGAL MATTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39
EXPERTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39
ENFORCEMENT OF JUDGMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	39
WHERE YOU CAN FIND ADDITIONAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	41
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE . . . . . . . . . . . . . . . . . . . . . . . .	42

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ABOUT THIS PROSPECTUS

This prospectus is part of a shelf registration statement that we have filed with the U.S. Securities and

Exchange Commission (the “SEC” or the “Commission”) using a “shelf” registration process. Under this shelf

registration process, we may, from time to time, offer and sell or otherwise transfer the ordinary shares described in

this prospectus and in an accompanying prospectus supplement, if required, in one or more offerings. Unless the

context indicates otherwise, when we refer to “Constellium SE” or the “Company” in this prospectus, we are

referring to Constellium SE; when we refer to “we,” “our,” “us,” “Constellium,” or the “Group” in this prospectus,

we are referring to Constellium SE together with its subsidiaries.

This prospectus provides you with a general description of the ordinary shares we may offer. Each time we

sell our ordinary shares using this prospectus, if and to the extent necessary, we will provide a prospectus

supplement that will contain specific information about the terms of that offering, including the number or amount

of shares being offered, the manner of distribution, the identity of any underwriters or other counterparties and other

specific material terms related to the offering. We may also add, update or change any of the information contained

in this prospectus in a prospectus supplement, a free writing prospectus or in documents we incorporate by reference

into this prospectus. To the extent that any statement that we make in a prospectus supplement, a free writing

prospectus or a document incorporated by reference into this prospectus is inconsistent with statements made in this

prospectus, the statements made in this prospectus will be deemed modified, supplemental or superseded by those

made in such prospectus supplement, free writing prospectus or document incorporated by reference, as applicable.

Accordingly, you should carefully read this prospectus, any prospectus supplement and any applicable free writing

prospectus, together with additional information described under the heading “Incorporation By Reference,” before

you invest in our ordinary shares.

We have not authorized anyone to provide any information other than that contained in or incorporated by

reference into this prospectus and any applicable prospectus supplement or contained in any free writing prospectus

prepared by or on behalf of us or to which we may have referred you. We do not take any responsibility for, and can

provide no assurance as to the reliability of, any other information that others may give you. We have not

authorized any other person to provide you with different or additional information and are not making an offer to

sell or transfer the ordinary shares in any jurisdiction where the offer or sale is not permitted. You should assume

that the information appearing in this prospectus is accurate only as of the date on the front cover of this prospectus,

regardless of the time of delivery of the prospectus or any sale of the ordinary shares. Our business, financial

condition, results of operations and prospects may have changed since the date on the front cover of this prospectus.

For investors outside of the United States, we have not done anything that would permit the offering or

possession or distribution of this prospectus in any jurisdiction where action for that purpose is required, other than

in the United States. You are required to inform yourselves about and to observe any restrictions relating to the

offering and the distribution of this prospectus outside of the United States.

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SUMMARY

This summary is a brief discussion of material information contained in, or incorporated by reference into, this

prospectus, as further described under “Where You Can Find More Information” and “Incorporation by

Reference.” This summary does not contain all of the information that you should consider before investing in

ordinary shares being offered by this prospectus. We urge you to carefully read this entire prospectus, the

documents incorporated by reference into this prospectus and any applicable prospectus supplement relating to the

ordinary shares that you propose to buy, especially any description of investment risks that we may include in any

applicable prospectus supplement or in documents incorporated by reference in this prospectus.

The Company

We are a global leader in the development, manufacture and sale of a broad range of high value-added

specialty rolled and extruded aluminum products to the aerospace, space, defense, packaging, automotive,

commercial transportation and general industrial end-markets. Our business model is to add value by converting

aluminum into semi-fabricated and in some instances fully-fabricated alloyed aluminum products which meet

stringent and performance-critical requirements from our customers. Our product portfolio generally commands

higher margins as compared to less differentiated, more commoditized aluminum products. Our business model aims

to pass through aluminum price exposure by pricing our products to include the cost of the metal purchased and

hedging any remaining exposure to achieve aluminum price neutrality.

Our portfolio of flexible, integrated and strategically located facilities is well invested, technologically

advanced and competitively positioned. We believe that we are a critical supplier to many of our customers given

our world-class technological and R&D capabilities, our intellectual property and more than 50 years of

manufacturing experience. Many of our products are technically advanced, requiring long and complex qualification

processes as well as the need for close customer collaborations including joint product development. We believe that

our strategic footprint, differentiated capabilities, technically advanced product portfolio, integrated approach and

long-standing customer relationships are difficult to replicate and support our competitive position.

Our principal U.S. executive office is 300 East Lombard Street, Suite 1710, Baltimore, MD 21202 and our

telephone number is (443) 420-7861. The address for our agent for service of process in the United States is

Corporation Service Company, 80 State Street, Albany, New York 12207-2543, and its telephone number is + 1

(302) 636-5400.

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RISK FACTORS

Investing in our ordinary shares involves risks. Before making a decision to invest in our ordinary shares,

you should carefully consider the risks described under “Risk Factors” in any prospectus supplement and in our

most recent Annual Report on Form 10-K, and in any updates to those risk factors in our Quarterly Reports on

Form 10-Q or our Current Reports on Form 8-K incorporated herein or in any prospectus supplement, together with

all of the other information appearing or incorporated by reference in this prospectus and any prospectus

supplement, in light of your particular investment objectives and financial circumstances. The risks and uncertainties

that we discuss in any document incorporated by reference in this prospectus are those that we believed as of the

date of the document to be risks which may materially affect us. Additional risks and uncertainties not then known

to us or that we then believed to be immaterial also may materially and adversely affect our business, financial

condition and results of operations.

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

This prospectus and the documents incorporated in it by reference contain “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, but not limited to, “anticipates,” “believes,” “could,” “estimates,” “expects,” “forecasts,” “intends,” “likely,”

“may,” “plans,” “should,” “targets,” “will,” or “would,” and similar expressions (or the negative of these

terminologies or expressions). Forward-looking statements do not relate strictly to historical or current facts and

reflect management’s current assumptions, beliefs, expectations, objectives, plans and projections about the future,

including with respect to our business, results of operations and financial condition. Accordingly, forward-looking

statements are subject to uncertainties, risks and changes that are difficult to predict and many of which are outside

of our control. Such factors include, but are not limited to:

•market competition;

•global or regional economic downturns or adverse changes in industry-specific conditions,

including the impacts of tax and tariff programs, inflation, foreign currency exchange, and

industry consolidation;

•disruption to business operations;

•natural disasters, including severe flooding and other weather-related events;

•geopolitical tensions and conflicts, including the ongoing conflict between Russia and Ukraine and

the ongoing conflict involving the United States, Israel and Iran;

•the inability to meet customer demand and quality requirements;

•the loss of key customers, suppliers or other business relationships;

•supply disruptions;

•excessive inflation;

•potential capacity constraints or lack of effectiveness of our hedging policy activities;

•the loss of key employees;

•levels of indebtedness that could limit our operating flexibility and opportunities; and

•other business or investment considerations that may be disclosed from time to time in our SEC

filings or in other publicly disseminated written documents.

We caution you that the foregoing list may not contain all of the factors that are important to you. In

addition, in light of these risks and uncertainties, the matters referred to in the forward-looking statements contained

in this prospectus and the documents incorporated in it by reference may not in fact occur. We undertake no

obligation to publicly update or revise any forward-looking statement as a result of new information, future events or

otherwise, except as required by law.

USE OF PROCEEDS

Unless we state differently in the applicable prospectus supplement, we expect to use the net proceeds we

receive from the sale of the ordinary shares offered by us pursuant to this prospectus and any applicable prospectus

supplement for general corporate purposes, which could include, in addition to funding operations, acquisitions and

other transactions. We will not receive proceeds from the sale of ordinary shares by persons other than us except as

may otherwise be stated in any applicable prospectus supplement.

DESCRIPTION OF CAPITAL STOCK

This section of the prospectus includes a description of the material terms of the Company’s Articles of

Association as of the date of this prospectus and of specific provisions of the French Code de commerce, which

governs the rights of holders of the Company’s ordinary shares, which we refer to as the “French Commercial

Code.” The following description is intended as a summary only and is qualified in its entirety by reference to the

complete text of the Articles of Association, which is filed as Exhibit 3.1 to the registration statement of which this

prospectus is a part. We urge you to read the full text of that exhibit.

General

The Company’s number with the Paris Trade and Companies Register is 831 763 743. According to the

Articles of Association, the object of the Company, directly or indirectly, in any form, in France and in all countries,

is:

•to incorporate, to participate in, to finance, to collaborate with, to manage, to supervise businesses,

companies and other enterprises and to provide advice and other services;

•to acquire, use and/or assign industrial and intellectual property rights and real property;

•to finance and/or acquire companies and any businesses;

•to borrow, to lend and to raise funds, including through the issue of bonds, debt instruments or

other securities or evidence of indebtedness, as well as to enter into agreements in connection with

the aforementioned activities;

•to invest funds;

•to provide guarantees and security for debts of legal persons or of other companies with which the

Company is affiliated in a Group or for the debts of third parties; and

•to undertake all that which is connected to the foregoing or in furtherance thereof,

all of the above being understood in the broadest sense of the words.

Outstanding Capital Stock

As of March 31, 2026, the Company’s issued and paid-up share capital amounted to €2,936,397.68

consisting of 146,819,884 ordinary shares, each with a nominal value of €0.02, all of the same class, out of which

136,150,450 were outstanding and 10,669,434 were treasury shares.

French law does not recognize the concept of authorized capital, and any capital increase must be expressly

authorized at an extraordinary shareholders’ meeting of the Company (including by way of delegation granted to the

Board of Directors).

Each ordinary share is entitled to one vote, except for treasury shares which do not have voting rights.

Form of Shares

Pursuant to the Articles of Association, our ordinary shares are available in the form of an entry in a share

register without issuance of a share certificate, and may be registered either on the U.S. register (the “U.S. Register”)

maintained by our transfer agent, Computershare Trust Company, N.A. (“Computershare”), or on accounts

maintained in France in accordance with French requirements (such accounts being collectively referred to as the

“French Register”).

The U.S. Register

Shares registered on the U.S. Register are held either in the name of Cede & Co., acting on behalf of the

Depositary Trust Company (“DTC”), or directly in the name of shareholders. Only shares registered on the U.S.

the New York Stock Exchange (“NYSE”). Shares that are held directly in the name of shareholders may be moved

to banks or brokers in order to access trading on the NYSE. Shares registered on the U.S. Register are in bearer (“au

porteur”) form for purposes of French law.

The ordinary shares of Constellium SE are admitted to the operations of the central depositary Euroclear

France. Uptevia (formerly CACEIS Corporate Trust) acts in France as registered intermediary (“intermédiaire

inscrit”) for the account of the owners of the shares registered on the U.S. Register in accordance with articles L.

228-1 et seq. of the French Commercial Code.

The French Register

Shares registered on the French Register may be in “au nominatif” form (i.e., registered on an account

maintained by or on behalf of the Company) or in “au porteur” form (i.e., registered on an account maintained by an

authorized intermediary in accordance with Article L. 211-3 of the French code monétaire et financier to comply

with French requirements). With respect to shares held in “au nominatif” form, each shareholder may elect to give

instructions directly to the issuer or its agent (“au nominatif pur”) or through an authorized intermediary with which

it has opened a securities account (“nominatif administré”). The accounts on which shares are held in any such

forms (“nominatif pur,” “nominatif administré,” “au porteur”) are collectively referred to as the French Register.

Each shareholder has the option to have its shares registered on the U.S. Register or on the French Register

and, in the latter case, to have its shares held in “au nominatif” or in “au porteur” form.

Any shareholder seeking to transfer its shares from one register to another will have to give proper

instructions, at its own cost, to its broker or the Company, as the case may be.

Restrictions on Share Transfer and Ownership

Our ordinary shares are freely transferable except as otherwise restricted under U.S. or other applicable

laws, which may include securities laws, antitrust laws or laws restricting foreign investment. Under current French

laws and regulations related to foreign investments, the acquisition, directly or indirectly, of 25% or more of the

voting rights of a French company by a non-French investor, or a French investor domiciled outside of France or

controlled by one or more of the former, is subject to prior approval of the French Ministry of the Economy, if the

company is involved, even occasionally, in activities which may impact public order, public security or national

defense interests. Certain activities of certain French subsidiaries of Constellium SE may qualify as such activities

and, therefore, the acquisition, directly or indirectly, of 25% or more of the voting rights of Constellium SE may

require such prior approval.

Issuance of Ordinary Shares

As indicated under “—Form of Shares” above, our shares may be held in either registered (“au nominatif”)

or bearer (“au porteur”) form, at the shareholder’s discretion.

Shares must be issued for a subscription price at least equal to their nominal value, which must be fully

paid unless otherwise agreed. Shares paid in cash must be paid up to at least 25% of their nominal value and, as the

case may be, the whole of any issue premium at the time of issuance.

In order to be traded on the NYSE, shares must be held through a participant in the system managed by

DTC. To that end, shares that are DTC-eligible are recorded in the U.S. Register maintained by Computershare. The

U.S. Register includes all shares traded on the NYSE as well as the shares registered directly in the name of a

shareholder on the U.S. Register.

Shares recorded in the U.S. Register are in bearer (“au porteur”) form, meaning that a registered

intermediary for the account of our beneficial owners (the “French Intermediary”) is registered in France for the

account of the owners of the shares registered on the U.S. Register in accordance with articles L. 228-1 et seq. of the

French Commercial Code.

Shares other than those recorded in the U.S. Register are recorded on the French Register. Such shares may

not be traded on the NYSE (see “—Form of Shares” above). Any shareholder wishing to hold its shares on one or

another register shall, at its own expense, provide instructions to this end to its account holder or to the Company, as

applicable.

As a French company that has listed securities in the United States, we are subject to U.S. securities laws

and regulations regarding trading in the Company’s ordinary shares and certain other matters. Under U.S. securities

laws and regulations, persons are prohibited from trading on the basis of material, non-public information. We apply

the Company’s Insider Trading Policy consistent with U.S. laws and regulations and make this policy available to

our directors and employees to whom these laws and regulations may apply. The rules on insider dealing, unlawful

disclosure of inside information and market manipulation under Regulation (EU) No 596/2014 of the European

Parliament and of the Council of April 16, 2014 on market abuse (and the texts adopted for its implementation)

apply to the Company as an issuer of debt securities that are admitted to trading on the Euro MTF market of the

Luxembourg Stock Exchange.

Rights of Shareholders and Shareholders’ Meetings

Under French law and in general, each shareholder is entitled to one vote per share at any general

shareholders’ meeting unless the Articles of Association provide otherwise. A general shareholders’ meeting is held

annually to, among other things, approve the annual financial statements. General shareholders’ meetings (including

annual meetings) can be ordinary and/or extraordinary, depending upon the resolutions submitted to the vote.

At an extraordinary general shareholders’ meeting (which votes upon any proposal to change the Articles

of Association, including any change in the rights of shareholders), the requisite majority is 2/3 of the votes validly

cast. The quorum necessary for such a meeting to be validly held on the date set by the first convening notice is 1/4

of the voting shares. If this quorum is not reached, then a second meeting is convened with an agenda identical to the

first meeting. If the quorum at the second meeting is not reached, then the second meeting can be postponed to a

date no later than two months after the date on which the second meeting was convened. The quorum for such

second or postponed meeting, as the case may be, to be validly held is 1/5 of the voting shares.

At an ordinary shareholders’ meeting (which votes upon any proposal within the competence of a general

shareholders’ meeting other than an extraordinary shareholders’ meeting, such as approval of annual financial

statements or appointment of directors), the requisite majority is a simple majority (more than 50%) of the votes

validly cast. The quorum necessary for such a meeting to be validly held on the date set by the first convening notice

is 1/5 of the voting shares. If this quorum is not reached, then a second meeting is convened with an agenda identical

to the first meeting and no quorum is required for such second meeting.

Special meetings would bring together the holders of shares of a specified class (if any were to be created)

to vote on an amendment to the rights relating to the shares of such class. A majority at special meetings would be

2/3 of the votes validly cast. The quorum necessary for such a meeting to be validly held on the date set by the first

convening notice would be 1/3 of the voting shares, and, if such quorum is not met, the quorum would be 1/5 of the

voting shares for the meeting held on the date set by the second convening notice or in the case of postponement of

the second meeting.

Except as otherwise provided in the meeting materials made available to the shareholders whose shares are

registered on the U.S. Register, the votes cast at the shareholders’ meetings do not include votes attaching to shares

in respect of which the shareholder did not vote or abstained or returned a blank or spoilt ballot paper (save for blank

proxies which are deemed granted to the chairman of the meeting under French law).

The Articles of Association do not provide for cumulative voting. In accordance with the provisions of the

French Commercial Code applicable as of the date hereof, the right to participate in, and vote at, a shareholders’

meeting is granted to all the shareholders whose shares are fully paid up and for whom a right to attend and vote at a

shareholders’ meeting has been established by registration of their shares in their names or names of the authorized

intermediary acting on their behalf on the fifth business day prior to the shareholders’ meeting at 0:00 (zero hour)

(Paris time) (the “French Record Date”), either in the registered (“au nominatif”) shares accounts held by the

Company (or an agent acting on its behalf) or in the bearer (“au porteur”) shares accounts held by the authorized

intermediary.

Shareholders holding shares registered on the U.S. Register (which include all shares which are listed on

the NYSE, held through a DTC participant, and shares directly recorded in the name of shareholders with

Computershare) vote through the following process:

•their voting instructions are transmitted to the Company via the French Intermediary, acting as

intermediary for the account of all shareholders registered on the U.S. Register, in accordance with

articles L. 228-1 et seq. of the French Commercial Code;

•the French Record Date is set:only the shareholders as of the French Record Date have the right to

participate in, and vote at, a shareholders’ meeting;

•an additional record date is set for all shareholders registered on the U.S. Register, which date is

generally on or about the 50th day before the meeting, subject to approval by the Board of

Directors (the “U.S. Record Date”): the meeting materials are mailed to the shareholders whose

shares are registered on the U.S. Register as of the U.S. Record Date; and

•shareholders who purchase shares between the U.S. Record Date and the French Record Date are

entitled to participate in, and vote at, the shareholders’ meeting as long as they continue to be

shareholders on the French Record Date. Given the short time between the French Record Date

and the shareholders’ meeting date, shareholders as of the French Record Date who become

shareholders subsequent to the U.S. Record Date may not have received the notices and

information received by shareholders holding shares registered on the U.S. Register as of the U.S.

Record Date. To the extent that shareholders as of the U.S. Record Date have sent voting

instructions and sold or otherwise transferred their shares as of the French Record Date, such

voting instructions will be invalidated or modified by the Company, whichever is applicable, in

accordance with the relevant provisions of the French Commercial Code.

Shareholder Proposals and Action by Written Consent

Pursuant to French law, the Board of Directors is required to convene an annual ordinary general meeting

of shareholders for approval of the annual financial statements. This meeting must be held within six months after

the end of each prior fiscal year.

The Board of Directors may also convene an ordinary or extraordinary meeting of shareholders upon

proper notice at any time during the year. If the Board of Directors fails to convene a shareholders’ meeting, then the

auditors may call the meeting. In a bankruptcy, the liquidator or court-appointed agent may also call a shareholders’

meeting in some instances. Any of the following may request the court to appoint an agent to convene a

shareholders' meeting (subject to establishing that such request is in furtherance of the corporate interest):

•one or several shareholders holding at least 5% of the share capital; or

• any interested party or the worker’s committee in cases of urgency.

Shareholders holding a majority of the capital or voting rights after a public take-over bid or exchange offer

or the transfer of a controlling block of shares may also convene a shareholders’ meeting. In general, shareholders

can only take action at shareholders’ meetings on matters listed on the agenda for the meeting. As an exception to

this rule, shareholders may take action with respect to the dismissal and appointment of directors, whether or not the

resolution was listed on the agenda for the meeting.

Under French law, proposals of additional resolutions to be submitted for approval by the shareholders at

the shareholders’ meeting may be submitted to the Board of Directors within the legal time limit (which is no later

than 20 days from the publication of the convening notice (avis de réunion) and no later than 25 days prior to the

date of the shareholders’ meeting) by one or several shareholders holding a specified percentage of shares. The

convening notice (avis de réunion) must be published in France with the BALO at least 35 days before the date of

the shareholders’ meeting and can be consulted at https://www.journal-officiel.gouv.fr/balo/. As the U.S. Record

Date is generally on or about the 50th day before the shareholders’ meeting and the meeting materials are mailed to

the shareholders registered on the U.S. Register shortly thereafter, shareholders wishing to submit proposals of

additional resolutions should consider submitting them before receiving the meeting materials, otherwise they may

have insufficient time for submission of any such resolution. The percentage of shares required to be held by one or

several shareholders to be able to submit proposals of additional resolutions depends on the amount of the share

capital of the Company; based on the Company’s issued share capital of €2,936,397.68 as of March 31, 2026, this

percentage would be 2.88%. Further disclosure regarding shareholder proposals and the annual ordinary general

meeting are set forth in the Company’s annual proxy materials.

Under French law, shareholders’ action by written consent is not permitted in a Societas Europaea.

Shareholder Suits

French law provides that a shareholder, or a group of shareholders, may initiate a legal action to seek

indemnification from the Chief Executive Officer (“CEO”) and/or the directors of a company in the company’s

interest if the company fails to bring such legal action itself. If so, any damages awarded by the court are paid to the

company and any legal fees relating to such action are borne by the relevant shareholder or the group of

shareholders. The plaintiff must remain a shareholder throughout the duration of the legal action. There is no other

case under French law where shareholders may initiate a derivative action to enforce a right of a company.

A shareholder may alternatively or cumulatively bring an individual legal action against the CEO and/or the

directors, provided that the shareholder has suffered distinct damages from those suffered by the company. In this

case, any damages awarded by the court are paid to the relevant shareholder.

Repurchase of Shares; Preemptive Rights; Shareholder Vote on Certain Reorganizations

Under French law, a private company (which the Company is considered to be for French law purposes so

long as its shares are not listed on an EU-regulated market) may not subscribe for newly issued shares in its capital

but may, however, acquire its own shares, under a shareholders’ authorization up to the 10% of the share capital

(effective for a period of up to 12 months), with a view to allocating the repurchased shares:

•within one year of the repurchase, to employees and corporate officers of the company and its

affiliates, under a profit-sharing, free share or share option plan or other share allocation;

•within two years of the repurchase, as payment or in exchange for assets acquired by the company

in connection with a potential acquisition, merger, demerger or contribution-in-kind transaction,

not to exceed 5% of the share capital;

•within five years from the repurchase, to shareholders willing to purchase the shares as part of a

sale process organized by the company.

The repurchased shares not used for one of the above-mentioned purposes and within the above-mentioned

timeframes are automatically cancelled. As of the date hereof, the Company has in place a shareholders’

authorization to the Board of Directors to purchase its own shares.

Also, under French law, a private company (which the Company is considered to be for French law

purposes so long as its shares are not listed on an EU-regulated market) may acquire its own shares, without

shareholder approval, with a view to allocating the repurchased shares, within one year of the repurchase, to

employees and corporate officers of the company and its affiliates under a free share or share option plan or other

share allocation.

For the avoidance of doubt, any allocations of repurchased shares to a profit-sharing, free share or share

option plan or other share allocation are subject to applicable limits under the Constellium SE 2013 Equity Incentive

Plan (as amended from time to time, the “Plan”).

In any case, the number of its own shares owned by the Company and held in treasury cannot exceed 10%

of a total of the Company’s issued shares at any given time. Treasury shares have no voting rights and are not

entitled to receive dividends.

The Company may also acquire its own shares to reduce its share capital, provided that such decision is not

driven by losses and that a purchase offer is made to all shareholders on a pro rata basis, with the approval of the

shareholders at the extraordinary general meeting determining the capital reduction.

Under French law, in case of issuance of additional shares or other securities giving the right, immediately

or in the future, to new shares for cash or set-off against cash debts, the existing shareholders have preferential

subscription rights to such securities on a pro rata basis unless such rights are waived by a two-thirds majority of the

votes held by the shareholders present, represented by proxy or voting by mail at the extraordinary meeting deciding

or authorizing the capital increase. If such rights are not waived by the extraordinary general meeting, each

shareholder may individually exercise or assign its preferential rights, or may choose not to exercise such rights. No

such rights exist with respect to treasury shares.

Generally, under French law, completion of a legal merger (fusion), demerger (scission), dissolution, sale,

lease or exchange of all or substantially all of a company’s assets requires:

• the approval of the Board of Directors; and

• the approval by a two-thirds majority of the votes held by the shareholders present, represented by

proxy or voting by mail at the relevant meeting, or in the case of a legal merger (fusion) with a

non-EU company, approval of all the shareholders of the company.

Anti-Takeover Provisions and Shareholder Disclosure Thresholds

Anti-Takeover Provisions

French law does not contain provisions restricting the ability to change the composition of the Board of

Directors following a change of control.

French law allows shareholders at general meetings to delegate the authority to the Board of Directors to

issue shares or warrants to subscribe for shares, including subsequent to the announcement of a takeover offer for

the Company, which may make it more difficult for a shareholder to obtain a control position.

Crossing of Threshold Notifications

According to the Articles of Association, any natural persons or legal entities acting alone or in concert,

who come to own, directly or indirectly, a number of shares equal to or greater than 5%, 10%, 15%, 20%, 25%,

30%, 33 1/3%, 50%, 66 2/3% or 90% of the total number of shares or voting rights must, within five (5) trading

days after the shareholding threshold is crossed, upwards or downwards, notify the Company, by certified letter with

acknowledgment of receipt, of the total number of shares or voting rights that they own alone, directly or indirectly,

or in concert.

The notification must specify (i) the number of securities held giving deferred rights to the shares to be

issued and the corresponding voting rights and (ii) the number of shares already issued or the voting rights they may

acquire.

Furthermore, according to the Articles of Association, any persons or entities who hold a number of shares

equal to or greater than 10%, 15%, 20% or 25% of the total number of shares or voting rights in the Company shall

inform the Company of the objectives they intend to pursue over the six months to come. In such case, the

notification must specify (i) whether the shareholder is acting alone or in concert, (ii) whether the shareholder plans

to discontinue or continue their purchase, (iii) whether the shareholder plans to acquire control of the Company, and

(iv) whether the shareholder plans to request their appointment or that of another person as director.

Any persons or entities who continue to hold a number of shares or voting rights equal to or greater than the

fractions described above must renew their statement of intent, in compliance with the aforementioned terms, every

six months.

The Company reserves the right to share with the public and shareholders either the objectives that it has

been notified of, or the relevant person’s failure to comply with the aforementioned obligation. These obligations are

in addition to any reporting requirements that may be imposed by Sections 13(d) or 13(g) of the Exchange Act.

For the application of the preceding subparagraphs, the shares or voting rights listed in paragraphs one to

eight of Article L. 233-9 I of the French Commercial Code shall be considered equivalent to the shares or voting

rights held by a shareholder.

Mandatory Takeover Offer

According to the Articles of Association, any natural or legal persons, acting alone or in concert under

Article L. 233-10 of the French Commercial Code, who come into possession, other than following a voluntary

takeover bid, directly or indirectly, of more than 30% of the capital or voting rights of the Company, is required to

file a draft takeover offer for all the capital and securities granting access to the capital or voting rights, and on terms

that comply with applicable U.S. securities laws, the rules and regulations of the SEC and applicable NYSE rules.

The same requirement applies to natural or legal persons, acting alone or in concert, who directly or

indirectly own between 30% and 50% of the total number of equity securities or voting rights of the Company and

who, in less than twelve consecutive months, increase their holding, in capital or voting rights, of at least 1% of the

total number of equity securities or voting rights of the Company.

When a draft offer is submitted, the price proposed must be at least equal to the highest price paid by the

offeror, acting alone or in concert within the meaning of Article L. 233-10 of the French Commercial Code, over a

period of twelve months preceding the event giving rise to the obligation to submit the draft offer.

In the event of a clear change in the characteristics of the Company, if the market for its securities so

justifies or in the absence of a transaction by the offeror, acting alone or in concert, over the Company’s shares

during the twelve-month period mentioned in the first paragraph, the price will be fixed by an expert appointed in

accordance with Article 1592 of the French Civil Code and determined according to objective evaluation criteria

customarily used, the characteristics of the Company and the market for its securities. The expert is required to

take into account, in its assessment, the criteria identified by the Autorité des Marchés Financiers (the “AMF”) and

the French courts.

The obligation to file a draft public offer does not apply if the person or persons concerned justify to the

Company the satisfaction of one of the conditions listed in Articles 234-7 and 234-9 of the AMF General

Regulations. In the event of disagreement between the parties, an expert is appointed by the president of the

commercial court, ruling in the form of interim relief, for the purpose of determining whether or not it is necessary

to file a draft public offer. The expert is required to apply the relevant provisions of the AMF General Regulations

as well as the criteria issued by the AMF and the French courts.

Any breach of the obligation to file a takeover offer as provided in the Articles of Association may give

rise to claims for damages or, as the case may be, action for injunctive relief.

Dividends

Our Board of Directors periodically explores the potential adoption of a dividend program. Any proposal of

our Board of Directors to declare and pay future dividends to holders of our ordinary shares will be at the discretion

of our Board of Directors and will depend on many factors, including our financial condition, earnings, capital

requirements, level of indebtedness, statutory obligations, future prospects and contractual restrictions applying to

the payment of dividends and other considerations that our Board of Directors considers to be relevant. The Board of

Directors has no current intention to adopt a dividend program, and no assurances can be made that any future

dividends will be paid on the ordinary shares.

Under French law, dividends are approved by the shareholders at a shareholders’ meeting. All calculations

to determine the amounts available for dividends or other distributions will be based on our statutory financial

statements which are, as a holding company, different from our consolidated financial statements and which are

prepared in accordance with French generally accepted accounting principles because the Company is a French

company. Dividends may only be paid by a French Societas Europaea (an SE), such as the Company, out of

“distributable profits,” plus any distributable reserves and “distributable premium” that the shareholders decide to

make available for distribution, other than those reserves that are specifically required by law to be maintained.

“Distributable profits” consist of the unconsolidated net profits of the relevant company for each fiscal

year, as increased or reduced by any profit or loss carried forward from prior years.

“Distributable premium” refers to the contribution paid by the shareholders in addition to the par value of

their shares for their subscription that the shareholders decide to make available for distribution.

The Board of Directors may approve the distribution of interim dividends before the approval by the

shareholders of the financial statements for the relevant fiscal year when the interim balance sheet, established

during or at the close of such year and certified by the auditors, reflects that the company has earned distributable

profits since the close of the previous fiscal year, after recognizing the necessary depreciation and provisions and

after deducting prior losses, if any, and the sums to be allocated to reserves, as required by French law and the

Articles of Association, and including any retained earnings. The amount of such interim dividends may not exceed

the amount of the profit so defined. The distribution of interim dividends decided by the Board of Directors must be

ratified by the next shareholders’ meeting. In addition, restrictions contained in agreements governing the

Company's indebtedness may limit our ability to pay dividends on the Company's ordinary shares and the ability of

the Company’s subsidiaries to pay dividends to the Company. Future indebtedness that the Company may incur

may contain similar restrictions.

According to the Articles of Association, distributions payable in cash are to be approved in euros and paid

(i) in euros for the holders of shares under the French Register and (ii) in U.S. dollars for the holders of shares under

the U.S. Register. For the purposes of the payment of the dividend in dollars, the general shareholders’ meeting or,

as the case may be, our Board of Directors, may set the reference date to be considered for the euro/U.S. dollar

exchange rate.

Dividends (if any) shall be paid within nine months after the end of the fiscal year. Cash dividends and

other distributions that have not been collected within five years after the date on which they became due and

payable will revert to the French State.

French exchange control regulations currently do not limit the amount of payments that we may remit to

non-residents of France. Laws and regulations concerning foreign exchange controls do require, however, that all

payments or transfers of funds made by a French resident to a non-resident be handled by an accredited

intermediary, who would be required to comply with relevant laws in making such payments or transfers.

Liquidation Rights and Dissolution

In the event of dissolution and liquidation of the Company, and after the Company has paid all debts and

liquidation expenses, all assets available for distribution shall be distributed to holders of the Company’s ordinary

shares pro rata based on the amount paid upon the shares held by such holders.

Differences in Corporate Law

We are incorporated under the laws of France. The following discussion summarizes material differences

between the rights of holders of our ordinary shares and the rights of holders of the common stock of a typical

corporation incorporated under the laws of the state of Delaware, which result from differences in governing

documents and the laws of France and Delaware.

This discussion does not purport to be a complete statement of the rights of holders of our ordinary shares

under applicable French law and our Articles of Association or the rights of holders of the common stock of a

typical corporation under applicable Delaware law and a typical certificate of incorporation and bylaws.


Delaware	France
Duties of directors
The board of directors of a Delaware corporation bears the ultimate responsibility for managing the business and affairs of a corporation. There is generally only one board of directors. In discharging this function, directors of a Delaware corporation owe fiduciary duties of care and loyalty to the corporation and to its shareholders. The duty of care generally requires that a director act in good faith, with the care that an ordinarily prudent person would exercise under similar circumstances. Under this duty, a director must inform himself of all material information reasonably available regarding a significant transaction. The duty of loyalty requires that a director act in a manner he reasonably believes to be in the best interests of the corporation. Directors must not use their corporate position for personal gain or advantage. In general, but subject to certain exceptions, actions of a director are presumed to have been made on an informed basis, in good faith and in the honest belief that the action taken was in the best interests of the corporation. However, this presumption may be rebutted by evidence of a breach of one of the fiduciary duties. Delaware courts have also imposed a heightened standard of conduct upon directors of a Delaware corporation who take any action designed to defeat a threatened change in control of the corporation. In addition, under Delaware law, when the board of directors of a Delaware corporation approves the sale or break-up of a corporation, the board of directors may, in certain circumstances, have a duty to obtain the highest value reasonably available to the shareholders.	In France, a company organized as a “Societas Europaea” can have a two-tier board structure: a management board comprising managing directors (Directoire) and a supervisory board comprising the non-executive directors (Conseil de Surveillance), or a single-tier board of directors (Conseil d’Administration). The single-tier board of directors of such French company will be comprised of non-executive directors and, if any, executive directors. Under French law, the board of directors supervises the management of the executive officers, sets the guidelines for a company’s activities and oversees their implementation. Subject to the powers expressly assigned by law to the shareholders’ meetings and within the limit of the corporate purpose, the board of directors hears any issue relevant to the company’s operation and, by means of its deliberations, settles the matters of concern to it, taking into consideration the social and environmental impact of the company’s activity. The board of directors proceeds with the controls and checks what it deems advisable. In addition, the board of directors exercises the special powers conferred on it by law As of the date of this document, we have a single-tier Board of Directors consisting of one executive director (the CEO) and ten non-executive directors, two of whom are employee directors appointed to our Board of Directors by, respectively, the French Group Works Council and the European Works Council.


Delaware	France
	Under French law, each director has a duty towards the company to properly perform his/her duties. Furthermore, each director has a duty to act in the corporate interest of the company. The corporate interest extends to the interests of all corporate stakeholders, such as shareholders, creditors, employees, customers and suppliers. The company is bound vis-à-vis third parties by the actions of its board of directors, even if such actions are not in line with the corporate purpose, unless it can be proven that the third party knew that the action exceeded that purpose or that the third party could not have been unaware of such excess in light of the circumstances; publication of the articles of association (which, under French law, include a description of the corporate purpose) does not per se constitute such proof. Any board resolution regarding a change in the company’s Articles of Association requires shareholders’ approval or ratification. The board of directors may decide in its sole discretion, within the confines of French law and the Articles of Association, to incur additional indebtedness subject to any contractual restrictions pursuant to existing financing arrangements. Under French law, there is no obligation for directors to hold shares in the company unless required by the articles of association. According to our Articles of Association, there is no such obligation. However, the Company adopted internal Share-Ownership Guidelines (“SOGs”) to encourage minimum levels of the Company’s share ownership by its executive director (CEO) and by those of its non-executive directors who receive compensation in such capacity.


Delaware	France
Director terms
The Delaware General Corporation Law generally provides for a one-year term for directors, but permits directorships to be divided into up to three classes with up to three-year terms, with the years for each class expiring in different years, if permitted by the certificate of incorporation, an initial bylaw or a bylaw adopted by the shareholders. A director elected to serve a term on a “classified” board may not be removed by shareholders without cause, except as otherwise provided in the certificate of incorporation. There is no limit to the number of terms a director may serve.	Under French law, a director of a company is appointed for a maximum term of six years. In practice, the articles of association set the directors’ precise term. According to the Articles of Association, the term of office of the Company’s directors is three years and can be renewed without limitation. Directors may be appointed for a shorter term so that the renewal of the directors’ terms of office may be spread out over time. According to the Articles of Association, the number of directors who are more than seventy-five years old may not exceed one third of the directors in office, and, if this limit is exceeded during the terms of office, the oldest director shall automatically be considered to have resigned at the close of the next general meeting. According to the Articles of Association, the Chairman of the Board of Directors cannot be older than seventy- five years. If the Chairman of the Board of Directors reaches this age limit during his or her term as Chairman, he or she is automatically deemed to have resigned from such position. His or her mandate would extend however, until the next meeting of the Board of Directors during which his or her successor is appointed. As set forth in the Articles of Association, the Board of Directors also comprises two employee directors whose term of office is also three years, renewable.


Delaware	France
Director election and vacancies
The Delaware General Corporation Law provides that vacancies and newly created directorships may be filled by a majority of the directors then in office (even though less than a quorum) or by a sole remaining director unless (a) otherwise provided in the certificate of incorporation or bylaws of the corporation or (b) the certificate of incorporation directs that a particular class of stock is to elect such director, in which case a majority of the other directors elected by such class, or a sole remaining director elected by such class, will fill such vacancy.	Under French law, new members of the board of directors of a company are appointed by the general meeting of shareholders by a simple majority. The board of directors which convenes the shareholders’ meeting proposes candidates; shareholders may also propose candidates under certain conditions. The shareholders at the meeting may vote for other candidates than those proposed on the agenda, by a simple majority. Vacancies on the board of directors occurring between shareholders’ meetings may be filled at a board meeting by a majority of the remaining directors, subject to ratification at the next shareholders’ meeting. According to the Articles of Association, the first employee director is appointed by the French Group Works Council and the second by the European Works Council. In the event of a vacancy in a seat of an employee director, the vacant seat is filled in by an employee designated in the same way as the replaced employee director.


Delaware	France
Conflict of interest transactions
Under the Delaware General Corporation Law, an act or transaction between a corporation and its directors or officers may not be the subject of equitable relief, or give rise to an award of damages, if: (1) the material facts as to the director’s or officer’s relationship or interest are disclosed or are known to all members of the board of directors or a committee of the board, and the board or committee in good faith and without gross negligence authorizes the act or transaction by the affirmative votes of a majority of the disinterested directors, even though the disinterested directors be less than a quorum (provided that if a majority of directors are not disinterested, a committee of at least two disinterested directors must approve the act or transaction); (2) the act or transaction is approved or ratified by an informed, uncoerced, affirmative vote of a majority of the votes cast by the disinterested stockholders; or (3) the act or transaction is fair as to the corporation and the corporation’s stockholders. Common or interested directors may be counted in determining the presence of a quorum at a meeting of the board of directors or of a committee which authorizes the act or transaction.	Pursuant to French law and the Articles of Association any agreement between (directly or through an intermediary) a company and any of its directors, its executive corporate officers (“Directeur Général” or any “Directeur Général Délégué”), its shareholders holding more than 10% of its voting rights or companies controlling such shareholders, that is not entered into (i) in the ordinary course of business and (ii) under normal terms and conditions, is subject to a prior authorization of the board of directors, excluding the participation and vote of the interested director. Such agreement is also described in a special report of the statutory auditors to the shareholders and subject to approval at the next ordinary shareholders’ meeting (by a simple majority), excluding the votes of any interested persons. The foregoing requirements also apply to agreements between the company and another entity if one of the company’s directors, or executive corporate officers (“Directeur Général” or any “Directeur Général Délégué”) is an owner, a general partner, manager, director, general manager, member of the executive or supervisory board of the other entity, as well as to agreements in which one of the company’s directors, executive corporate officers (“Directeur Général”or any “Directeur Général Délégué”), shareholders holding more than 10% of its voting rights or companies controlling such shareholders has an indirect interest. If the transaction has not been pre-approved by the board of directors, then it can be nullified if it has prejudicial consequences for the company. If an agreement is not then approved by the shareholders, then the interested person may be held liable for any prejudicial consequences for the company of the unapproved transaction; such transaction will nevertheless remain valid unless it is nullified in case of fraud. Aside from the above rule, there are no specific provisions prohibiting conflicted directors to participate or vote at board meetings. However, as a general rule, directors must act in the interest of the company.
Minimum number of directors
Under the Delaware General Corporation law, a corporation must have at least one director and the number of directors shall be fixed by or in the manner provided in the bylaws (unless specified in the certificate of incorporation of the corporation).	Under French law, a company organized as an SE must have at least three directors. The number of directors is defined by the Articles of Association. Pursuant to the Articles of Association, the Board shall be composed of directors between three and eighteen in number.


Delaware	France
Qualifications of directors
Under the Delaware General Corporation law, a corporation may prescribe qualifications for directors under its certificate of incorporation or bylaws.	French law does not impose any requirement in terms of qualifications of directors for a company whose shares are not listed on an EU-regulated market.
Notice of annual meetings
Under the Delaware General Corporation law, the annual meeting of stockholders shall be held at such place, on such date and at such time as may be designated from time to time by the board of directors or as provided in the certificate of incorporation or by the bylaws.	Under French law and according to the Articles of Association, the annual general meeting of shareholders shall be held at such place, on such date and at such time as may be decided from time to time by the Board of Directors which in principle convenes the meeting and as specified in the convening notice (avis de convocation).
Shareholder proxy voting
Under the Delaware General Corporation law, at any meeting of stockholders, a stockholder may designate another person to act for such stockholder by proxy, but no such proxy shall be voted or acted upon after three years from its date, unless the proxy provides for a longer period.	Under French law and according to the Articles of Association, at any meeting of shareholders, a shareholder may be represented by the intermediary registered on its/his/her behalf; or assign a proxy to another shareholder, to his/her spouse, or to the partner with whom he/she has entered into a civil union (pacte civil de solidarité); or vote by mail; or send a proxy to the company without indicating an assignment, in accordance with the conditions set forth by French law. In this last case, unless otherwise indicated in the proxy, proxies are deemed given to the chairman of the general meeting of shareholders who will vote in favor of the proposals of resolutions presented or approved by the board of directors and against all the other proposals of resolutions.


Delaware	France
Appraisal Rights
Under the Delaware General Corporation Law, a holder of shares of any class or series has the right, in specified circumstances, to dissent from a merger, consolidation, conversion, transfer, domestication or continuance by demanding payment in cash for the stockholder’s shares equal to the fair value of those shares, as determined by the Delaware Court of Chancery in an action timely brought by the corporation or a dissenting stockholder. Delaware law grants these appraisal rights in the case of mergers, consolidations, conversions, transfers, domestications and continuances, but not in the case of a sale or transfer of assets or a purchase of assets for shares. Further, no appraisal rights are available for shares of any class or series of stock, that is: (i) listed on a national securities exchange or (ii) held of record by more than 2,000 holders, unless the agreement of merger or consolidation requires the holders to accept for their shares anything other than: shares of stock of the surviving or resulting corporation, or of the converted entity; shares of stock of another corporation that are listed on a national securities exchange or held of record by more than 2,000 holders; cash in lieu of fractional shares described in the two preceding bullet points; or any combination of the above. In addition, appraisal rights are not available for shares of the surviving corporation if the merger did not require the vote of the stockholders of the surviving corporation.	French law does not provide for the payment of cash or the grant of appraisal rights to dissenting shareholders, except in case of an EU cross-border merger and/or conversion (subject to certain requirements).
How to amend the articles of incorporation
Under the Delaware General Corporation law, generally a corporation may amend its certificate of incorporation if: •its board of directors has adopted a resolution setting forth the amendment proposed and declared its advisability; and •the amendment is adopted by the affirmative votes of a majority (or such greater percentage as may be specified by the corporation) of the outstanding shares entitled to vote on the amendment and a majority (or such greater percentage as may be specified by the corporation) of the outstanding shares of each class or series of stock, if any, entitled to vote on the amendment as a class or series.	Under French law and pursuant to the Articles of Association, only the extraordinary general meeting of shareholders may approve or ratify an amendment to the articles of association. The amendment is validly adopted by the votes of a two thirds (2/3) majority.


Delaware	France
Proxy voting by directors
A director of a Delaware corporation may not issue a proxy representing the director’s voting rights as a director.	According to French law and the Articles of Association, a director may grant another director a proxy to represent him or her at a meeting of the board of directors. No director can hold more than one proxy at any meeting.


Delaware	France
Voting rights
Under the Delaware General Corporation Law, each shareholder is entitled to one vote per share of stock, unless the certificate of incorporation provides otherwise. In addition, the certificate of incorporation may provide for cumulative voting at all elections of directors of the corporation, or at elections held under specified circumstances. Either the certificate of incorporation or the bylaws may specify the number of shares or the amount of other securities that must be represented at a meeting to constitute a quorum, but in no event will a quorum consist of less than one-third of the shares entitled to vote at a meeting, except that, where a separate vote by a class or series or classes or series is required, a quorum will consist of no less than 1/3 of the shares of such class or series or classes or series. Shareholders as of the record date for the meeting are entitled to vote at the meeting, and the board of directors may fix a record date that is no more than 60 days nor less than 10 days before the date of the meeting, and if no record date is set then the record date is the close of business on the day next preceding the day on which notice is given, or, if notice is waived, at the close of business on the day next preceding the day on which the meeting is held. The determination of the shareholders of record entitled to notice or to vote at a meeting of shareholders shall apply to any adjournment of the meeting, but the board of directors may fix a new record date for the adjourned meeting.	Under French law and in general, each shareholder is entitled to one vote per share at any general shareholders’ meeting unless the Articles of Association provide otherwise. A general shareholders meeting is held annually to, among other things, approve the annual financial statements. General shareholders’ meetings (including annual meetings) can be ordinary and/or extraordinary, depending upon the resolutions submitted to the vote. At an extraordinary general shareholders’ meeting (which votes upon any proposal to change the Articles of Association, including any change in the rights of shareholders), the requisite majority is 2/3 of the votes validly cast. The quorum necessary for such a meeting to be validly held on the date set by the first convening notice is 1/4 of the voting shares. If this quorum is not reached, then a second meeting is convened with an agenda identical to the first meeting. If the quorum at the second meeting is not reached, then the second meeting can be postponed to a date no later than two months after the date on which the second meeting was convened. The quorum for such second or postponed meeting, as the case may be, to be validly held is 1/5 of the voting shares. At an ordinary shareholders’ meeting (which votes upon any proposal within the competence of a general shareholders’ meeting other than an extraordinary shareholders’ meeting, such as approval of annual financial statements or appointment of directors), the requisite majority is a simple majority (more than 50%) of the votes validly cast. The quorum necessary for such a meeting to be validly held on the date set by the first convening notice is 1/5 of the voting shares. If this quorum is not reached, then a second meeting is convened with an agenda identical to the first meeting and no quorum is required for such second meeting. Special meetings would bring together the holders of shares of a specified class (if any were to be created) to vote on an amendment to the rights relating to the shares of such class. A majority at special meetings would be 2/3 of the votes validly cast.


Delaware	France
	Except as otherwise provided in the meeting materials made available to the shareholders whose shares are registered on the U.S. Register, the votes cast at the shareholders’ meetings do not include votes attaching to shares in respect of which the shareholder did not vote or abstained or returned a blank or spoilt ballot paper (save for blank proxies which are deemed granted to the chairman of the meeting under French law). The Articles of Association do not provide for cumulative voting. In accordance with the provisions of the French Commercial Code applicable as of the date hereof, the right to participate in, and vote at, a shareholders’ meeting is granted to all the shareholders whose shares are fully paid up and for whom a right to attend and vote at a shareholders’ meeting has been established by registration of their shares in their names or names of the authorized intermediary acting on their behalf on the fifth business day prior to the shareholders’ meeting at 0:00 (zero hour) (Paris time) (the “French Record Date”), either in the registered (“au nominatif”) shares accounts held by the Company (or an agent acting on its behalf) or in the bearer (“au porteur”) shares accounts held by the authorized intermediary. Shareholders holding shares registered on the U.S. Register (which include all shares which are listed on the NYSE, held through a DTC participant and shares directly recorded in the name of shareholders with Computershare) vote through the following process: •their voting instructions are transmitted to the Company via the French Intermediary, acting as intermediary for the account of all shareholders registered on the U.S. Register, in accordance with articles L. 228-1 et seq. of the French Commercial Code; •the French Record Date is set; only the shareholders as of the French Record Date have the right to participate in, and vote at, a shareholders’ meeting; •an additional record date is set for all shareholders registered on the U.S. Register, which date is generally on or about the 50th day before the meeting, subject to approval by the Board of Directors (the “U.S. Record Date”); the meeting materials are mailed to the shareholders whose shares are registered on the U.S. Register as of the U.S. Record Date and •the French Record Date, such voting instructions will be invalidated or modified by the Company, whichever is applicable, in accordance with the relevant provisions of the French Commercial Code.


Delaware	France
	•shareholders who purchase shares between the U.S. Record Date and the French Record Date are entitled to participate in and vote at the shareholders’ meeting as long as they continue to be shareholders on the French Record Date. Given the short time between the French Record Date and the shareholders’ meeting date, shareholders as of the French Record Date who become shareholders subsequent to the U.S. Record Date may not have received the notices and information received by shareholders holding shares registered on the U.S. Register as of the U.S. Record Date. To the extent that shareholders as of the U.S. Record Date have sent voting instructions and sold or otherwise transferred their shares as of the U.S. Record Date have sent voting instructions and sold or otherwise transferred their shares as of the French Record Date, such voting instructions will be invalidated or modified by the Company, whichever is applicable, in accordance with the relevant provisions of the French Commercial Code.


Delaware	France
Shareholder proposals
Delaware law does not provide shareholders an express right to put any proposal before a meeting of shareholders, but it provides that a corporation’s bylaws may provide that if the corporation solicits proxies with respect to the election of directors, it may be required to include in its proxy solicitation materials one or more individuals nominated by a shareholder. In keeping with common law, Delaware corporations generally afford shareholders an opportunity to make proposals and nominations; provided that they comply with the notice provisions in the certificate of incorporation or bylaws.	Pursuant to French law, the Board of Directors is required to convene an annual ordinary general meeting of shareholders for approval of the annual financial statements. This meeting must be held within six months after the end of each prior fiscal year. The Board of Directors may also convene an ordinary or extraordinary meeting of shareholders upon proper notice at any time during the year. If the Board of Directors fails to convene a shareholders’ meeting, then the auditors may call the meeting. In a bankruptcy, the liquidator or court-appointed agent may also call a shareholders’ meeting in some instances. Any of the following may request the court to appoint an agent to convene a shareholders’ meeting (subject to establishing that such request is in furtherance of the corporate interest): •one or several shareholders holding at least 5% of the share capital; or •any interested party or the worker’s committee in cases of urgency. Shareholders holding a majority of the capital or voting rights after a public take-over bid or exchange offer or the transfer of a controlling block of shares may also convene a shareholders’ meeting. In general, shareholders can only take action at shareholders’ meetings on matters listed on the agenda for the meeting. As an exception to this rule, shareholders may take action with respect to the dismissal and appointment of directors, whether or not the resolution was listed on the agenda for the meeting.


Delaware	France
	Under French law, proposals of additional resolutions to be submitted for approval by the shareholders at the shareholders’ meeting may be submitted to the Board of Directors within the legal time limit (which is no later than 20 days from the publication of the convening notice (avis de réunion) and no later than 25 days prior to the date of the shareholders’ meeting) by one or several shareholders holding a specified percentage of shares. The convening notice (avis de réunion) must be published in France with the BALO at least 35 days before the date of the shareholders’ meeting and can be consulted at https://www.journal-officiel.gouv.fr/balo/. As the U.S. Record Date is generally on or about the 50th day before the shareholders’ meeting and the meeting materials are mailed to the shareholders registered on the U.S. Register shortly thereafter, shareholders wishing to submit proposals of additional resolutions should consider submitting them before receiving the meeting materials, otherwise they may have insufficient time for submission of any such resolution. The percentage of shares required to be held by one or several shareholders to be able to submit proposals of additional resolutions depends on the amount of the share capital of the Company; based on the Company’s issued share capital of €2,936,397.68 as of March 31, 2026, this percentage would be 2.88%. Further disclosure regarding shareholder proposals and the annual ordinary general meeting are set forth in the Company’s annual proxy materials.
Action by written consent
Unless otherwise provided in the corporation’s certificate of incorporation, any action required or permitted to be taken at any annual or special meeting of shareholders of a corporation may be taken without a meeting, without prior notice and without a vote, if one or more consents in writing, setting forth the action to be so taken, are signed by the holders of outstanding stock having not less than the minimum number of votes that would be necessary to authorize or take such action at a meeting at which all shares entitled to vote thereon were present and voted. Although permitted by Delaware law, publicly listed companies do not typically permit stockholders of a corporation to take action by written consent.	Under French law, shareholders’ action by written consent is not permitted in a Societas Europaea.


Delaware	France
Shareholder suits
Under the Delaware General Corporation Law, a shareholder may bring a derivative action on behalf of the corporation to enforce the rights of the corporation. An individual also may commence a class action suit on behalf of himself and other similarly situated shareholders where the requirements for maintaining a class action under Delaware law have been met. A person may institute and maintain such a suit only if that person was a shareholder at the time of the transaction which is the subject of the suit. In addition, under Delaware case law, the plaintiff normally must be a shareholder not only at the time of the transaction that is the subject of the suit, but also throughout the duration of the derivative suit. Delaware law also requires that the derivative plaintiff make a demand on the directors of the corporation to assert the corporate claim before the suit may be prosecuted by the derivative plaintiff in court, unless such a demand would be futile.	French law provides that a shareholder, or a group of shareholders, may initiate a legal action to seek indemnification from the CEO and/or the directors of a company in the company’s interest if the company fails to bring such legal action itself. If so, any damages awarded by the court are paid to the company and any legal fees relating to such action are borne by the relevant shareholder or the group of shareholders. The plaintiff must remain a shareholder throughout the duration of the legal action. There is no other case under French law where shareholders may initiate a derivative action to enforce a right of a company. A shareholder may alternatively or cumulatively bring an individual legal action against the CEO and/or the directors, provided that the shareholder has suffered distinct damages from those suffered by the company. In this case, any damages awarded by the court are paid to the relevant shareholder.
Liability of Directors and Officers
Under the Delaware General Corporation Law, a corporation’s certificate of incorporation may include a provision eliminating or limiting the personal liability of a director or officer to the corporation or its stockholders for monetary damages for breach of fiduciary duty as a director or officer. However, no provision can limit or eliminate the liability of a director or officer for: (i) any breach of the duty of loyalty; (ii) acts or omissions not in good faith or which involve intentional misconduct or a knowing violation of law; (iii) a director’s liability under § 174 of Title 8 (relating to willful or negligent payment of unlawful dividends or unlawful stock purchases or redemptions); (iv) any transaction from which the director or officer derived an improper personal benefit; or (v) an officer’s liability in any action by or in the right of the corporation.	To the extent permitted by French law, a company may include a provision to limit the civil liability of a director. According to the Articles of Association, directors shall be reimbursed under certain conditions for (i) reasonable cost of conducting a defense against claims based on acts or failure to act in the exercise of their duties and (ii) any damages payable by them as a result of an act or failure in the exercise of their duties. However there shall be no entitlement to indemnity: •if and to the extent the laws of France would not permit such indemnification; •if and to the extent a competent court has established in a final and conclusive decision that the act or failure to act of the current or former member of the Board may be characterized as willful (faute intentionnelle), intentionally reckless (faute lourde) or falling outside the exercise of its duties (faute détachable); or •if and to the extent the costs, damages or fines payable by the current or former member of the Board are covered by any liability insurance and the insurer has paid out the costs, damages or fines.


Delaware	France
Repurchase of shares
Under the Delaware General Corporation Law, a corporation may purchase or redeem its own shares unless the capital of the corporation is impaired or the purchase or redemption would cause an impairment of the capital of the corporation. A Delaware corporation may, however, purchase or redeem out of capital any of its preferred shares or, if no preferred shares are outstanding, any of its own shares if such shares will be retired upon acquisition and the capital of the corporation will be reduced in accordance with specified limitations.	Under French law, a private company (which the Company is considered to be for French law purposes so long as its shares are not listed on an EU-regulated market) may not subscribe for newly issued shares in its capital, but may, however, acquire its own shares, under a shareholders’ authorization up to the 10% of the share capital (effective for a period of up to 12 months), with a view to allocating the repurchased shares: •within one year of the repurchase, to employees and corporate officers of the company and its affiliates under a profit-sharing, free share or share option plan or other share allocation; •within two years of the repurchase, as payment or in exchange for assets acquired by the company in connection with a potential acquisition, merger, demerger or contribution- in-kind transaction, not to exceed 5% of the share capital; •within five years from the repurchase, to shareholders willing to purchase the shares as part of a sale process organized by the company. The repurchased shares not used for one of the above- mentioned purposes and within the above-mentioned timeframes are automatically cancelled. As of the date hereof, the Company has in place a shareholders’ authorization to the Board of Directors to purchase its own shares. Also, under French law, the Company may acquire its own shares, without shareholders’ approval, with a view to allocating the repurchased shares within one year of the repurchase, to employees and corporate officers of the company and its affiliates under a free share or share option plan or other share allocation. For the avoidance of doubt, any allocations of repurchased shares to a profit-sharing, free share or share option plan or other share allocation are subject to applicable limits under the Constellium SE 2013 Equity Incentive Plan (as amended from time to time, the “Plan”). In any case, the number of its own shares owned by the Company and held in treasury cannot exceed 10% of a total of the Company’s issued shares at any given time. Treasury shares have no voting rights and are not entitled to receive dividends.


Delaware	France
	The Company may also acquire its own shares to reduce its share capital; provided that such decision is not driven by losses and that a purchase offer is made to all shareholders on a pro rata basis, with the approval of the shareholders at the extraordinary general meeting determining the capital reduction.
Anti-takeover provisions
	French law does not contain provisions restricting the ability to change the composition of the Board of Directors following a change of control.


Delaware	France
In addition to other aspects of Delaware law governing fiduciary duties of directors during a potential takeover, the Delaware General Corporation Law also contains a business combination statute that protects Delaware companies from hostile takeovers and from actions following the takeover by prohibiting some transactions once an acquirer has gained a significant holding in the corporation. Section 203 of the Delaware General Corporation Law prohibits “business combinations,” including mergers, sales and leases of assets, issuances of securities and similar transactions by a corporation or a subsidiary with an interested shareholder that beneficially owns 15% or more of a corporation’s voting stock (or which is an affiliate or associate of the corporation and owned 15% or more of the corporation’s outstanding voting stock within the past three years), within three years after the person becomes an interested shareholder, unless: the transaction that will cause the person to become an interested shareholder is approved by the board of directors of the target before the transaction; after the completion of the transaction in which the person becomes an interested shareholder, the interested shareholder holds at least 85% of the voting stock of the corporation not including shares owned by persons who are directors and also officers of interested shareholders and shares owned by specified employee benefit plans; or after the person becomes an interested shareholder, the business combination is approved by the board of directors of the corporation and authorized at an annual or special meeting of stockholders, and not by written consent, by the affirmative vote of at least 66⅔% of the outstanding voting stock which is not owned by the interested shareholder. A Delaware corporation may elect not to be governed by Section 203 by a provision contained in the original certificate of incorporation of the corporation or an amendment to the certificate of incorporation or to the bylaws of the company, which amendment must be approved by a majority of the shares entitled to vote and may not be further amended by the board of directors of the corporation. An amendment adopted by stockholder action to opt out of Section 203 is not effective until twelve months after its adoption in certain cases, and the election shall not apply to any business combination with a person who became an interested stockholder before the amendment’s effective date.	French law allows shareholders at general meetings to delegate the authority to the Board of Directors to issue shares or warrants to subscribe for shares, including subsequent to the announcement of a takeover offer for the Company, which may make it more difficult for a shareholder to obtain a control position.


Delaware	France
Inspection of books and records
Under the Delaware General Corporation Law, any shareholder may inspect for any proper purpose the corporation’s stock ledger, a list of its shareholders and its other books and records during the corporation’s usual hours of business.	The board of directors must provide all required information for the shareholders’ meeting. Under French law, shareholders are entitled to review and copy the list of the shareholders (name and address) who hold their shares in nominative form during 15 days prior to any shareholders’ meeting.
Removal of directors
Under the Delaware General Corporation Law, any director or the entire board of directors may be removed, with or without cause, by the holders of a majority of the shares then entitled to vote at an election of directors, except (a) unless the certificate of incorporation provides otherwise, in the case of a corporation whose board is classified, shareholders may effect such removal only for cause, or (b) in the case of a corporation having cumulative voting, if less than the entire board is to be removed, no director may be removed without cause if the votes cast against his removal would be sufficient to elect him if then cumulatively voted at an election of the entire board of directors, or, if there are classes of directors, at an election of the class of directors of which he is a part.	Under French law, directors may be removed from office, with or without cause, at any shareholders’ meeting without notice or justification, by a simple majority vote of shareholders. Directors cannot be suspended or removed by the board of directors. Under French law, an employee director may be removed from office only in case of a fault in the performance of the directorship, by decision of the president of a French court (Tribunal Judiciaire), at the request of a majority of the directors. An executive corporate officer appointed by the board of directors (CEO (Directeur Général)) can have his or her executive duties terminated at any time by the board of directors. If such executive corporate officer is also a director, he or she will remain non-executive director as his or her duties as a director can only be removed by a shareholders’ meeting.
Preemptive rights
Under the Delaware General Corporation Law, shareholders have no preemptive rights to subscribe to additional issues of stock or to any security convertible into such stock unless, and except to the extent that, such rights are expressly provided for in the certificate of incorporation.	Under French law, in case of issuance of additional shares or other securities giving the right, immediately or in the future, to new shares for cash or set-off against cash debts, the existing shareholders have preferential subscription rights to such securities on a pro rata basis unless such rights are waived by a two-thirds majority of the votes held by the shareholders present, represented by proxy or voting by mail at the extraordinary meeting deciding or authorizing the capital increase. If such rights are not waived by the extraordinary general meeting, each shareholder may individually exercise or assign its preferential rights, or may choose not to exercise such rights. No such rights exist with respect to treasury shares.


Delaware	France
Dividends
Under the Delaware General Corporation Law, a Delaware corporation may, subject to any restrictions contained in its certificate of incorporation, pay dividends out of its surplus (the excess of net assets over capital), or in case there is no surplus, out of its net profits for the fiscal year in which the dividend is declared or the preceding fiscal year (provided that the amount of the capital of the corporation is not less than the aggregate amount of the capital represented by the issued and outstanding stock of all classes having a preference upon the distribution of assets). In determining the amount of surplus of a Delaware corporation, the assets of the corporation, including stock of subsidiaries owned by the corporation, must be valued at their fair market value as determined by the board of directors, without regard to their historical book value. Dividends may be paid in the form of common stock, property or cash.	Our Board of Directors periodically explores the potential adoption of a dividend program. Any proposal of our Board of Directors to declare and pay future dividends to holders of our ordinary shares will be at the discretion of our Board of Directors and will depend on many factors, including our financial condition, earnings, capital requirements, level of indebtedness, statutory obligations, future prospects and contractual restrictions applying to the payment of dividends and other considerations that our Board of Directors considers to be relevant. The Board of Directors has no current intention to adopt a dividend program, and no assurances can be made that any future dividends will be paid on the ordinary shares. Under French law, dividends are approved by the shareholders at a shareholders’ meeting. All calculations to determine the amounts available for dividends or other distributions will be based on our statutory financial statements which are, as a holding company, different from our consolidated financial statements and which are prepared in accordance with French generally accepted accounting principles because the Company is a French company. Dividends may only be paid by a French Societas Europaea (an SE), such as the Company, out of “distributable profits,” plus any distributable reserves and “distributable premium” that the shareholders decide to make available for distribution, other than those reserves that are specifically required by law to be maintained. “Distributable profits” consist of the unconsolidated net profits of the relevant company for each fiscal year, as increased or reduced by any profit or loss carried forward from prior years.


Delaware	France
	“Distributable premium” refers to the contribution paid by the shareholders in addition to the par value of their shares for their subscription that the shareholders decide to make available for distribution. The Board of Directors may approve the distribution of interim dividends before the approval by the shareholders of the financial statements for the relevant fiscal year when the interim balance sheet, established during or at the close of such year and certified by the auditors, reflects that the company has earned distributable profits since the close of the previous fiscal year, after recognizing the necessary depreciation and provisions and after deducting prior losses, if any, and the sums to be allocated to reserves, as required by French law and the Articles of Association, and including any retained earnings. The amount of such interim dividends may not exceed the amount of the profit so defined. The distribution of interim dividends decided by the Board of Directors must be ratified by the next shareholders’ meeting. In addition, restrictions contained in agreements governing the Company’s indebtedness may limit our ability to pay dividends on the Company’s ordinary shares and the ability of the Company’s subsidiaries to pay dividends to the Company. Future indebtedness that the Company may incur may contain similar restrictions. According to the Articles of Association, distributions payable in cash are to be approved in euros and paid (i) in euros for the holders of shares under the French Register and (ii) in U.S. dollars for the holders of shares under the U.S. Register. For the purposes of the payment of the dividend in dollars, the general shareholders’ meeting or, as the case may be, our Board of Directors, may set the reference date to be considered for the euro/U.S. dollar exchange rate. Dividends (if any) shall be paid within nine months after the end of the fiscal year. Cash dividends and other distributions that have not been collected within five years after the date on which they became due and payable will revert to the French State. French exchange control regulations currently do not limit the amount of payments that we may remit to non- residents of France. Laws and regulations concerning foreign exchange controls do require, however, that all payments or transfers of funds made by a French resident to a non-resident be handled by an accredited intermediary, who would be required to comply with relevant laws in making such payments or transfers.


Delaware	France
Shareholder vote on certain reorganizations
Under the Delaware General Corporation Law, the vote of a majority of the outstanding shares of capital stock entitled to vote thereon generally is necessary to approve a merger or consolidation or the sale of substantially all of the assets of a corporation. The Delaware General Corporation Law permits a corporation to include in its certificate of incorporation a provision requiring for any corporate action the vote of a larger portion of the stock or of any class or series of stock than would otherwise be required. Under the Delaware General Corporation Law, no vote of the shareholders of a surviving corporation to a merger is needed; however, unless required by the certificate of incorporation, if (a) the agreement of merger does not amend in any respect the certificate of incorporation of the surviving corporation, (b) the shares of stock of the surviving corporation are not changed in the merger and (c) the number of ordinary shares of the surviving corporation into which any other shares, securities or obligations to be issued in the merger may be converted does not exceed 20% of the surviving corporation’s common shares outstanding immediately prior to the effective date of the merger. In addition, shareholders may not be entitled to vote in certain mergers with other corporations that own 90% or more of the outstanding shares of each class of stock of such corporation, but the shareholders will be entitled to appraisal rights.	Generally, under French law, completion of a legal merger (fusion), demerger (scission), dissolution, sale, lease or exchange of all or substantially all of a company’s assets, requires: •the approval of the Board of Directors; and •the approval by a two-thirds majority of the votes held by the shareholders present, represented by proxy or voting by mail at the relevant meeting, or in the case of a legal merger (fusion) with a non-EU company, approval of all the shareholders of the company.
Compensation of board of directors
Under the Delaware General Corporation Law, the shareholders do not generally have the right to approve the compensation policy for the board of directors or the senior management of the corporation, although certain aspects of the compensation policy may be subject to shareholder vote due to the provisions of federal securities and tax law, as well as stock exchange requirements.	The board of directors determines the remuneration of the executive director (i.e. the CEO (“Directeur Général”) who may (but is not required to) be a director). French law does not provide for any specific rules on remuneration of executive directors for French companies not listed on an EU-regulated market. Executive directors may be granted free shares and stock options of the Company.


Delaware	France
	With respect to the remuneration of non-executive directors, the ordinary shareholders’ meeting votes an envelope for the aggregate amount of fixed annual fees to be allocated to directors for each year. The board of directors will then decide the allocation of these fees among directors. These fees include all cash remunerations granted to directors in such capacity. In addition to the fixed amount of fees approved at the shareholders meeting, the board of directors may grant fees to the chairman of the board in such capacity, and may also, exceptionally, grant additional fees to certain directors in remuneration for separate, specific missions or tasks assigned to them. Non-executive directors are not eligible to receive awards that are to be settled with shares. However, the board of directors may grant share- settled awards (such as free shares or stock options) to the chairman of the board in such capacity.
Action by written consent and quorum requirements at the board of directors
Under the Delaware General Corporation Law, a majority of the total number of directors constitutes a quorum unless the company’s certificate of incorporation or bylaws require a greater number. Unless the certificate of incorporation says otherwise, the bylaws may provide that a number less than a majority constitutes a quorum (but no less than 1/3 of the total number of directors). The vote of the majority of the directors present at a meeting at which a quorum is present shall be the act of the board unless the certificate of incorporation or bylaws require the vote of a greater number. Unless otherwise restricted by the certificate of incorporation or bylaws, the board or any committee may take any action without a meeting if all members consent thereto in writing or by electronic transmission.	Following an amendment of the Articles of Association adopted by the Company’s Annual General Meeting held on May 15, 2025, all decisions of the Board of Directors may be adopted in writing. According to French law and the Articles of Association, a director may grant to another director a proxy to represent him or her at a meeting of the Board of Directors. No director can hold more than one proxy at any meeting. According to French law and the Articles of Association, for the Board’s deliberations to be valid, more than half of the Board members must be present or represented or have voted remotely or, as the case may be, have participated to a written consultation. The Board of Directors’ decisions (including by way of a written consultation) shall be taken by a majority vote; if the votes are tied, the chairman’s vote shall be decisive.

PLAN OF DISTRIBUTION

We may, from time to time, sell, transfer or otherwise dispose of ordinary shares or interests in ordinary

shares on any stock exchange, market or trading facility on which the ordinary shares are traded or in private

transactions. These dispositions may be at fixed prices, at prevailing market prices at the time of sale, at prices

related to the prevailing market price, at varying prices determined at the time of sale, or at negotiated prices.

The ordinary shares being offered by this prospectus may be sold:

•through agents;

•to or through one or more underwriters on a firm commitment or agency basis;

•through put or call option transactions relating to the ordinary shares;

•through broker-dealers (acting as agent or principal);

•directly to purchasers, through a specific bidding or auction process, on a negotiated basis or

otherwise;

•through any other method permitted pursuant to applicable law; or

•through a combination of any such methods of sale.

At the time of any particular offer of the ordinary shares covered by this prospectus, a revised prospectus or

prospectus supplement, if required, will be distributed which will set forth the aggregate amount of ordinary shares

being offered and the terms of the offering, including the name or names of any underwriters, dealers, brokers or

agents, any discounts, commissions, concessions and other items constituting compensation from us and any

discounts, commissions or concessions allowed or reallowed or paid to dealers. Such prospectus supplement, if

required, and, if necessary, a post-effective amendment to the registration statement of which this prospectus is a

part, will be filed with the SEC to reflect the disclosure of additional information with respect to the applicable

distribution of the ordinary shares in any offering. To comply with the laws of certain states, if applicable, the

ordinary shares sold under this prospectus may only be sold through registered or licensed broker-dealers. In

addition, in some states the ordinary shares may not be sold unless they have been registered or qualified for sale in

the applicable state or an exemption from registration or qualification requirements is available and is complied

with.

Any public offering price and any discounts or concessions allowed or reallowed or paid to dealers may be

changed from time to time.

The distribution of ordinary shares may be effected from time to time in one or more transactions, including

block transactions and transactions on the NYSE or any other organized market where the ordinary shares may be

traded. The ordinary shares may be sold at a fixed price or prices, which may be changed, or at market prices

prevailing at the time of sale, at prices relating to the prevailing market prices or at negotiated prices. The

consideration may be cash or another form negotiated by the parties. Agents, underwriters or broker-dealers may be

paid compensation for offering and selling the ordinary shares. That compensation may be in the form of discounts,

concessions or commissions to be received from us or the purchasers of the ordinary shares. Any dealers and agents

participating in the distribution of the ordinary shares may be deemed to be underwriters, and compensation received

by them on resale of the ordinary shares may be deemed to be underwriting discounts. If any such dealers or agents

were deemed to be underwriters, then they may be subject to statutory liabilities under the Securities Act of 1933, as

amended (the “Securities Act”).

Agents may from time to time solicit offers to purchase the ordinary shares. If required, we will name in

the applicable prospectus supplement any agent involved in the offer or sale of the ordinary shares and set forth any

compensation payable to the agent. Unless otherwise indicated in a prospectus supplement, any agent will be acting

on a best-efforts basis for the period of its appointment. Any agent selling the ordinary shares covered by this

prospectus may be deemed to be an underwriter, as that term is defined in the Securities Act, of the ordinary shares.

If underwriters are used in a sale, then ordinary shares will be acquired by the underwriters for their own

account and may be resold from time to time in one or more transactions, including negotiated transactions, at a

fixed public offering price or at varying prices determined at the time of sale, or other contractual commitments. In

such an offering, ordinary shares may be offered to the public either through underwriting syndicates represented by

one or more managing underwriters or directly by one or more firms acting as underwriters. If an underwriter or

underwriters are used in the sale of ordinary shares, then an underwriting agreement will be executed with the

underwriter or underwriters with respect to the particular underwritten offering of ordinary shares and will set forth

the terms of the transactions, including compensation of the underwriters and dealers and the public offering price, if

applicable. The prospectus and, if required, prospectus supplement will be used by the underwriters to resell the

ordinary shares.

If a dealer is used in any sale of the ordinary shares, then we or an underwriter will sell the ordinary shares

to the dealer, as principal. The dealer may then resell the ordinary shares to the public at varying prices to be

determined by the dealer at the time of resale. To the extent required, we will set forth in a prospectus supplement

the name of the dealer and the terms of the transactions.

We may directly solicit offers to purchase the ordinary shares and may make sales of ordinary shares

directly to investors. These persons may be deemed to be underwriters within the meaning of the Securities Act

with respect to any resale of the ordinary shares. To the extent required, a prospectus supplement will describe the

terms of any such sales, including the terms of any bidding or auction process, if used.

Agents, underwriters and dealers may be entitled under agreements which may be entered into with us to

indemnification by us against specified liabilities, including liabilities incurred under the Securities Act, or to

contribution by us to payments they may be required to make in respect of such liabilities. If required, a prospectus

supplement will describe the terms and conditions of the indemnification or contribution. Some agents, underwriters

or dealers, or their affiliates may be customers of, engage in transactions with or perform services for us or our

subsidiaries.

Any person participating in the distribution of ordinary shares registered under the registration statement

that includes this prospectus will be subject to applicable provisions of the Exchange Act and the applicable SEC

rules and regulations, including, among others, Regulation M, which may limit the timing of purchases and sales of

any of our ordinary shares by that person. Furthermore, Regulation M may restrict the ability of any person engaged

in the distribution of our ordinary shares to engage in market-making activities with respect to our ordinary shares.

These restrictions may affect the marketability of our ordinary shares and the ability of any person or entity to

engage in market-making activities with respect to our ordinary shares.

Any underwriters to whom offered ordinary shares are sold for public offering and sale may make a market

in such offered ordinary shares, but such underwriters will not be obligated to do so and may discontinue any market

making at any time without notice.

Any ordinary shares that qualify for sale pursuant to Rule 144 or another available exemption from

registration under the Securities Act may be sold under Rule 144 such exemption rather than pursuant to this

prospectus.

To the extent that we make sales to or through one or more underwriters or agents in at-the-market

offerings, we will do so pursuant to the terms of a distribution agreement between us and the underwriters or agents.

If we engage in at-the-market sales pursuant to a distribution agreement, then we will sell our ordinary shares to or

through one or more underwriters or agents, which may act on an agency basis or on a principal basis. During the

term of any such agreement, we may sell ordinary shares on a daily basis in exchange transactions or otherwise as

we agree with the underwriters or agents. The distribution agreement will provide that any ordinary shares sold will

be sold at prices related to the then prevailing market prices for our ordinary shares. Pursuant to the terms of the

distribution agreement, we also may agree to sell, and the relevant underwriters or agents may agree to solicit offers

to purchase, blocks of our ordinary shares. The terms of any at-the-market offering and the applicable distribution

agreement will be set forth in more detail in a prospectus supplement to this prospectus.

If any underwriter or agent acts as principal, or broker-dealer acts as underwriter, then it may engage in

certain transactions that stabilize, maintain or otherwise affect the price of our ordinary shares. We will describe any

such activities in the prospectus supplement relating to the transaction.

We may enter into derivative transactions with third parties or sell ordinary shares not covered by this

prospectus to third parties in privately negotiated transactions. If the applicable prospectus supplement indicates, in

connection with those derivatives, then such third parties (or affiliates of such third parties) may sell ordinary shares

covered by this prospectus and the applicable prospectus supplement, including in short-sale transactions. If so,

such third parties (or affiliates of such third parties) may use ordinary shares pledged by us or borrowed from us or

others to settle those sales or to close out any related open borrowings of shares, and may use ordinary shares

received from us in settlement of those derivatives to close out any related open borrowings of shares. The third

parties (or affiliates of such third parties) in such sale transactions will be underwriters and, if not identified in this

prospectus, will be identified in a prospectus supplement (or a post-effective amendment), if required.

We may loan or pledge ordinary shares to a financial institution or other third party that in turn may sell or

transfer the ordinary shares using this prospectus. Such financial institution or third party may transfer its short

position to investors in our ordinary shares or in connection with a simultaneous offering of other ordinary shares

offered by this prospectus or in connection with a simultaneous offering of other ordinary shares offered by this

prospectus.

LEGAL MATTERS

Unless otherwise specified in a prospectus supplement accompanying this prospectus, certain legal matters

in connection with the offerings pursuant to this prospectus relating to U.S. law will be passed upon for us by Jones

Day. The validity of the ordinary shares offered by this prospectus and other legal matters concerning offerings

pursuant to this prospectus relating to French law will be passed upon for us by Darrois Villey Maillot Brochier

A.A.R.P.I., Paris, France.

EXPERTS

The financial statements and management’s assessment of the effectiveness of internal control over

financial reporting (which is included in Management’s Annual Report on Internal Control over Financial

Reporting) incorporated in this prospectus by reference to the Annual Report on Form 10-K for the year ended

December 31, 2025 have been so incorporated in reliance on the report of PricewaterhouseCoopers Audit, an

independent registered public accounting firm, given on the authority of said firm as experts in auditing and

accounting.

ENFORCEMENT OF JUDGMENTS

The ability of our shareholders in certain countries other than France to bring an action against us may be

limited under applicable law. We are incorporated under the laws of France as a European company (Societas

Europaea) with a corporate seat in Paris, France. Some of our executive officers and members of our board of

directors, and a substantial number of our employees, are citizens or residents of countries other than the United

States. All or a substantial portion of the assets of such persons and a substantial portion of our assets are located

outside the United States.

Accordingly, it may be difficult for shareholders:

-to obtain jurisdiction over us or our non-U.S. resident officers and directors in U.S. courts in actions

predicated on the civil liability provisions of the U.S. federal securities laws (or to effect service of

process within the United States upon such persons);

-to enforce judgments obtained in such actions against us or our non-U.S. resident officers and

directors; and

-to bring an original action in a French court to enforce liabilities based upon the U.S. federal securities

laws against us or our non-U.S. resident officers or directors.

Nevertheless, a final judgment for the payment of money rendered by any federal or state court in the

United States based on civil liability, whether or not predicated solely upon the U.S. federal securities laws, would

be recognized and enforced in France provided that a French judge considers that this judgment meets the French

legal requirements concerning the recognition and the enforcement of foreign judgments and is capable of being

immediately enforced in the United States. A French court is therefore likely to grant the enforcement of a foreign

judgment without a review of the merits of the underlying claim, only if (1) the United States federal or state court

has jurisdiction to render the foreign judgment under the French rules of private international law and (2) that

judgment does not contravene French rules of international public policy (ordre public international) pertaining both

to the merits and to the procedure of the case, including principles of due process (principe du contradictoire) and

notably the right to a fair trial. The French court would also require that the U.S. judgment is not tainted with fraud

and is not incompatible with an earlier judgment rendered or recognized by a French court in the same or related

matter.

In addition, French law guarantees full compensation for the harm suffered but is limited to the actual

damages, so that the victim does not suffer or benefit from the situation. Such system excludes damages such as, but

not limited to, punitive and exemplary damages.

As a result, the enforcement, by U.S. investors, of any judgments obtained in U.S. courts in civil and

commercial matters, including judgments under the U.S. federal securities law against us or members of our board

of directors, officers or certain experts named herein who are residents of France or countries other than the United

States would be subject to the above conditions.

Finally, there may be doubt as to whether a French court would impose civil liability on us, the members of

our board of directors, our officers or certain experts named herein in an original action predicated solely upon the

U.S. federal securities laws brought in a court of competent jurisdiction in France against us or such members,

officers or experts, respectively.

A discovery process in connection with a judicial or administrative U.S. action filed in the United States

could under certain circumstances be adversely affected by applicable laws which could restrict obtaining evidence

directly from a person or entity located in France or from French persons (including in particular blocking statute

(French law No. 68-678 of July 26, 1968, as amended) and/or French and EU data protection rules (French law No.

78-17 of January 6, 1978 on data processing, data files and individual liberties, as modified by subsequent texts, as

well as Regulation (EU) 2016/679 of April 27, 2016 also known as “General Data Protection Regulation”).

WHERE YOU CAN FIND ADDITIONAL INFORMATION

We have filed with the SEC a registration statement on Form S-3 under the Securities Act, with respect to

the ordinary shares offered by this prospectus. However, as is permitted by the rules and regulations of the SEC,

this prospectus, which is part of our registration statement on Form S-3, omits certain non-material information,

exhibits, schedules and undertakings set forth in the registration statement. For further information about us and the

ordinary shares offered by this prospectus please refer to the registration statement.

In addition, we file annual, quarterly and current reports, proxy statements and other information with the

SEC in accordance with the requirements of the Exchange Act. Any statement contained in this prospectus, any

prospectus supplement or a previously filed document incorporated by reference will be deemed to be modified or

superseded for purposes of this prospectus to the extent that a statement contained in any later dated prospectus

supplement or document incorporated by reference modifies or replaces that statement.

The SEC maintains an Internet site that contains reports, proxy and information statements, and other

information regarding issuers, such as us, that file electronically with the SEC (http://www.sec.gov). Information

about us, including certain of the additional information described under “Incorporation of Certain Documents by

Reference,” is also available on the Investor Relations page of our website (https://www.constellium.com/). This

URL and the SEC’s URL are intended to be inactive textual references only. Such information on our or the SEC’s

website is not a part of this prospectus.

INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

We “incorporate by reference” into this prospectus the information we file with the SEC, which means that

we can disclose important information to you by referring you to those documents. The information incorporated by

reference is considered to be a part of this prospectus, and information in documents that we file later with the SEC

will automatically update and supersede information contained in documents filed earlier with the SEC or contained

in this prospectus. In other words, in the case of a conflict or inconsistency between information set forth in this

prospectus and information incorporated by reference into this prospectus, you should rely on the information

contained in this prospectus unless the information incorporated by reference was filed after the date of this

prospectus. We incorporate by reference:

•our Annual Report on Form 10-K for the fiscal year ended December 31, 2025;

•our Quarterly Report on Form 10-Q for the quarter ended March 31, 2026;

•our Current Reports on Form 8-K filed with the SEC on March 12, 2026 and May 21, 2026 (in

each case, except for information contained therein which is furnished rather than filed);

•the portions of our Definitive Proxy Statement on Schedule 14A that are deemed “filed” with the

SEC under the Exchange Act; and

•the description of our ordinary shares found in Amendment No. 3 to Form 8-A, as filed with the

SEC on December 12, 2019 (Commission File No. 001-35931), under the heading “Description of

Securities to be Registered,” including Exhibit 4.1 to our Annual Report on Form 10-K for the

fiscal year ended December 31, 2025 and any subsequent amendment or any report filed for the

purpose of updating such description.

To the extent that any information contained in any Current Report on Form 8-K, or any exhibit thereto,

was furnished to, rather than filed with, the SEC, such information or exhibit is specifically not incorporated by

reference in this prospectus unless specifically stated otherwise.

We also incorporate by reference any future filings we make with the SEC under Sections 13(a), 13(c), 14

or 15(d) of the Exchange Act, until we sell all of the securities we are offering with this prospectus.

Certain statements in and portions of this prospectus update and replace information in the above-listed

documents incorporated by reference. Likewise, statements in or portions of a future document incorporated by

reference in this prospectus may update and replace statements in and portions of this prospectus or the above-listed

documents. We will provide you without charge, upon your written or oral request to Investor Relations by phone at

+1 (443) 988-0600 or e-mail at investor-relations@constellium.com, or by mail at the address below, a copy of any

of the documents incorporated by reference in this prospectus, other than exhibits to such documents, which are not

specifically incorporated by reference into such documents.

Constellium SE

Washington Plaza, 40-44 rue Washington, 75008 Paris, France

Attention: External Communications

Constellium

300 East Lombard Street, Suite 1710, Baltimore, MD 21202 United States

Attention: Investor Relations

II-1

PART II

INFORMATION NOT REQUIRED IN THE PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution

The following are the estimated expenses to be incurred in connection with the distribution of the securities

registered under this registration statement, which will be paid by us. All amounts shown are estimates except the

SEC registration fee.


SEC Registration Fee			*
Legal Fees and Expenses			**
Accounting Fees and Expenses			**
Miscellaneous			**
Total			*


	*	In accordance with Rules 456(b) and 457(r), we are deferring payment of all of the registration fee required in connection with this registration statement.
	**	The foregoing sets forth the general categories of expenses (other than underwriting discounts and commissions) that we anticipate we will incur in connection with the offering of ordinary shares under this registration statement. Information regarding estimated expenses of issuance and distribution will be provided at the time information as to such offering is included in a prospectus supplement..

Item 15. Indemnification of Directors and Officers

The Articles of Association provide that the members and former members of the board of directors shall

be reimbursed for:

•reasonable cost of conducting a defense against claims, including claims by the Company (other

than such claims for which such members or former members of the board of directors have been

declared responsible for by a final court decision), based on acts or failures to act in the exercise of

their duties or any other duties currently or previously performed by them at our request; and

•any damages payable by them as a result of an act or failure to act in the exercise of their duties or

any other duties currently or previously performed by them at our request.

There shall be no entitlement to indemnity:

•if and to the extent the laws of France would not permit such indemnification;

•if and to the extent a competent court has established in a final and conclusive decision that the act

or failure to act of the current or former member of the board of directors may be characterized as

willful (faute intentionnelle), intentionally reckless (faute lourde) or falling outside the exercise of

its duties (faute détachable); or

•if and to the extent the costs, damages or fines payable by the current or former member of the

board of directors are covered by any liability insurance and the insurer has paid out the costs,

damages or fines.

Except if the claim is instituted by the Company itself, the relevant current or former member of the board

of directors is required to follow the Company’s instructions relating to the manner of his or her defense and consult

with the Company in advance about the manner of such defense. In addition, the person concerned may not: (i)

acknowledge any personal liability, (ii) waive any defense, or (iii) agree on a settlement, without the Company’s

prior written consent. The Company may take out liability insurance for the benefit of current or former members of

the board of directors.

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to directors,

officers or persons controlling us pursuant to the foregoing provisions, we have been informed that, in the opinion of

the Commission, indemnification is against public policy as expressed in the Securities Act and is therefore

unenforceable.

II-2

Item 16. Exhibits


Exhibit No.	Description
1.1	Form of Underwriting Agreement*
3.1	Articles of Association of Constellium SE, dated May 15, 2025 (incorporated by reference to Exhibit 3.1 of Constellium SE’s Form 10-Q filed on July 31, 2025, File No. 001-35931)
5.1	Opinion of Darrois Villey Maillot Brochier A.A.R.P.I., French counsel to Constellium SE, as to the validity of the ordinary shares
23.1	Consent of PricewaterhouseCoopers Audit, Independent Registered Public Accounting Firm
23.2	Form of Consent of Darrois Villey Maillot Brochier A.A.R.P.I. (included in Exhibit 5.1)
24.1	Powers of Attorney (included on signature page to the registration statement)
107	Calculation of Filing Fee Table

*To be filed, if necessary, as an exhibit to a post-effective amendment to this registration statement or as an exhibit to a Form

8-K to be filed by the registrant in connection with a specific offering, and incorporated herein by reference.

Item 17. Undertakings

(a) The undersigned registrant hereby undertakes:

(1) To file, during any period in which offers or sales are being made, a post-effective amendment to

this registration statement:

(i)to include any prospectus required by Section 10(a)(3) of the Securities Act of

1933, as amended;

(ii)to reflect in the prospectus any facts or events arising after the effective date of

the registration statement (or the most recent post-effective amendment thereof)

which, individually or in the aggregate, represent a fundamental change in the

information set forth in the registration statement. Notwithstanding the

foregoing, any increase or decrease in volume of securities offered (if the total

dollar value of securities offered would not exceed that which was registered)

and any deviation from the low or high end of the estimated maximum offering

range may be reflected in the form of prospectus filed with the Commission

pursuant to Rule 424(b) if, in the aggregate, the changes in volume and price

represent no more than 20% change in the maximum aggregate offering price set

forth in the “Calculation of Filing Fee Tables” in the effective registration

statement; and

(iii)to include any material information with respect to the plan of distribution not

previously disclosed in the registration statement or any material change to such

information in the registration statement;

provided, however, that paragraphs (a)(1)(i), (ii), and (iii) above do not apply if the information

required to be included in a post-effective amendment by those paragraphs is contained in reports filed with

or furnished to the Commission by the registrant pursuant to Section 13 or Section 15(d) of the U.S.

Securities Exchange Act of 1934, as amended, that are incorporated by reference in this registration

II-3

statement or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration

statement.

(2) That, for the purpose of determining any liability under the Securities Act, each such post-

effective amendment shall be deemed to be a new registration statement relating to the securities

offered therein, and the offering of such securities at that time shall be deemed to be the initial

bona fide offering thereof.

(3) To remove from registration by means of a post-effective amendment any of the securities being

registered which remain unsold at the termination of the offering.

(4) That, for the purpose of determining any liability under the Securities Act to any purchaser:

(i)Each prospectus filed by the registrant pursuant to Rule 424(b)(3) shall be

deemed to be part of the registration statement as of the date the filed prospectus

was deemed part of and included in the registration statement; and

(ii)Each prospectus required to be filed pursuant to Rule 424(b)(2), (b)(5), or (b)(7)

as part of a registration statement in reliance on Rule 430B relating to an

offering made pursuant to Rule 415(a)(1)(i), (vii), or (x) for the purpose of

providing the information required by Section 10(a) of the Securities Act shall

be deemed to be part of and included in the registration statement as of the

earlier of the date such form of prospectus is first used after effectiveness or the

date of the first contract of sale of securities in the offering described in the

prospectus. As provided in Rule 430B, for liability purposes of the issuer and

any person that is at that date an underwriter, such date shall be deemed to be a

new effective date of the registration statement relating to the securities in the

registration statement to which that prospectus relates, and the offering of such

securities at that time shall be deemed to be the initial bona fide offering thereof.

Provided, however, that no statement made in a registration statement or

prospectus that is part of the registration statement or made in a document

incorporated or deemed incorporated by reference into the registration statement

or prospectus that is part of the registration statement will, as to a purchaser with

a time of contract of sale prior to such effective date, supersede or modify any

statement that was made in the registration statement or prospectus that was part

of the registration statement or made in any such document immediately prior to

such effective date.

(5) That, for the purpose of determining liability of a registrant under the Securities Act to any

purchaser in the initial distribution of the securities, the undersigned registrant undertakes that in a

primary offering of securities of the undersigned registrant pursuant to this registration statement,

regardless of the underwriting method used to sell the securities to the purchaser, if the securities

are offered or sold to such purchaser by means of any of the following communications, the

undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such

securities to such purchaser:

(i)Any preliminary prospectus or prospectus of the undersigned registrant relating

to the offering required to be filed pursuant to Rule 424;

(ii)Any free writing prospectus relating to the offering prepared by or on behalf of

the undersigned registrant or used or referred to by the undersigned registrant;

(iii)The portion of any other free writing prospectus relating to the offering

containing material information about the undersigned registrant or its securities

provided by or on behalf of the undersigned registrant; and

(iv)Any other communication that is an offer in the offering made by the

undersigned registrant to the purchaser.

II-4

(b) The undersigned registrant hereby undertakes that, for purposes of determining any liability under the

Securities Act, each filing of the registrant's annual report pursuant to Section 13(a) or 15(d) of the

Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan's annual

report pursuant to Section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference

in the registration statement shall be deemed to be a new registration statement relating to the securities

offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide

offering thereof.

officers and controlling persons of the registrant pursuant to the foregoing provisions, or otherwise, the

registrant has been advised that in the opinion of the Securities and Exchange Commission such

indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the

event that a claim for indemnification against such liabilities (other than the payment by the registrant of

expenses incurred or paid by a director, officer or controlling person of the registrant in the successful

defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in

connection with the securities being registered, the registrant will, unless in the opinion of its counsel the

matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question

whether such indemnification by it is against public policy as expressed in the Act and will be governed by

the final adjudication of such issue.

II-5

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable

grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration

statement to be signed on its behalf by the undersigned, thereunto duly authorized, in Paris, France, on June 24,

2026.

Constellium SE

By: /s/ Ingrid Joerg

Name: Ingrid Joerg

Title: Chief Executive Officer and Director

POWER OF ATTORNEY

KNOW ALL PERSONS BY THESE PRESENTS, that the undersigned hereby constitute and appoint

Ingrid Joerg, Jack Guo, and Stephen Walters, and, each of them, individually, in each case as his or her true and

lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him and in his name, place

and stead in any and all capacities, in connection with this registration statement, including to sign in the name and

on behalf of the undersigned, this registration statement and any and all amendments thereto, including post-

effective amendments and registration statements filed pursuant to Rule 462 under the U.S. Securities Act of 1933,

and to file the same, with all exhibits thereto, and other documents in connection therewith, with the U.S. Securities

and Exchange Commission, granting unto such attorneys-in-fact and agents full power and authority to do and

perform each and every act and thing requisite and necessary to be done in and about the premises, as fully to all

intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said

attorneys-in-fact and agents, or his or her substitute, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed by

the following persons in the capacities and on the dates indicated.

II-6


Signature	Title	Date

/s/ Ingrid Joerg	Chief Executive Officer and Director	6/24/2026
Ingrid Joerg	(Principal Executive Officer)

/s/ Jack Guo	Executive Vice President and	6/24/2026
Jack Guo	Chief Financial Officer
	(Principal Financial and Accounting Officer)

/s/ Jean-Christophe Deslarzes	Chairman	6/24/2026
Jean-Christophe Deslarzes

/s/ John Ormerod	Director	6/24/2026
John Ormerod

/s/ Lori A. Walker	Director	6/24/2026
Lori A. Walker

/s/ Martha Brooks	Director	6/24/2026
Martha Brooks

/s/ Isabelle Boccon-Gibod	Director	6/24/2026
Isabelle Boccon-Gibod

/s/ Jean-Philippe Puig	Director	6/24/2026
Jean-Philippe Puig

/s/ Jean-Francois Verdier	Employee Director	6/24/2026
Jean-François Verdier

/s/ Wiebke Weiler	Employee Director	6/24/2026
Wiebke Weiler

/s/ Emmanuel Blot	Director	6/24/2026
Emmanuel Blot

/s/ Bradley Soultz	Director	6/24/2026
Bradley Soultz

II-7

AUTHORIZED REPRESENTATIVE

Pursuant to the requirements of Section 6(a) of the Securities Act, the undersigned has caused this

registration statement to be signed solely in the capacity as the duly authorized representative of Constellium SE in

the United States on June 24, 2026.

Constellium US Holdings I, LLC

By: /s/ Jack Guo

Name: Jack Guo

Title: President