Orion S.A.

Information Concerning Voting and Solicitation

The accompanying proxy is solicited on behalf of the Board of Directors for use at the Company’s 2026 Annual General Meeting to be held at the Company’s headquarters located at 6, Route de Trèves, L-2633 Senningerberg (Municipality of Niederanven), Grand Duchy of Luxembourg on June 25, 2026, at 2:00 p.m. CET, and any adjournment thereof.

On or about May 15, 2026, we will mail to our shareholders of record and beneficial owners a Notice of Internet Availability of Proxy Materials containing instructions on how to access this proxy statement (the “Proxy Statement”) and the annual accounts prepared in accordance with Luxembourg law and based on generally accepted accounting principles in Luxembourg for the financial year that ended on December 31, 2025, and our consolidated financial statements prepared in accordance with Luxembourg law and based on U.S. GAAP for the financial year that ended on December 31, 2025, as well as our Annual Report on Form 10-K.

The Notice of Internet Availability of Proxy Materials will also contain instructions on how you can receive a paper copy of the proxy materials. Our 2025 annual accounts, consolidated financial statements and Annual Report on Form 10-K, Notice of Internet Availability of Proxy Materials and the proxy card are first being made available online on or around May 15, 2026.

Questions and Answers About the General Meeting and Voting

What proposals are scheduled to be voted on at the Annual General Meeting and what is the recommendation of the Board on each of the proposals scheduled to be voted on at the Annual General Meeting?

Shareholders will be asked to vote on the following proposals:

Proposals

We are not aware of any other business to be brought before the Annual General Meeting. If any additional business is properly brought before the Annual General Meeting, proxies will be voted on those matters in accordance with the best judgment of the person or persons acting under the proxies.

How many votes are needed to approve the proposals and what is the effect of broker non-votes, abstentions or withheld votes?

As of April 23, 2026, the Company had 56,388,649 Common Shares issued and outstanding. Each Common Share is entitled to one vote on each matter brought before the Annual General Meeting.

Unless otherwise required by applicable law or by the articles of association of the Company, resolutions at the Annual General Meeting are adopted by a simple majority of the votes validly cast, except for the resolution regarding the frequency on future Say-on-Pay. Therefore, each proposal, except for the proposal regarding the frequency on future Say-on-Pay, made herein can be approved by a simple majority of the votes validly cast, regardless of the proportion of the issued share capital of the Company present or represented at such meeting.

With respect to the resolution regarding the frequency of future Say-on-Pay votes, the frequency of every one, two or three years which collects the highest number of votes validly cast will be determined to be the preferred frequency recommended by the shareholders of the Company.

The holders of Common Shares are not entitled to preemptive rights or cumulative voting on any of the aforementioned proposals, nor are such holders entitled to dissenters’ or appraisal rights with respect to such proposals.

Abstentions, broker non-votes (see below) and nil votes will not be taken into account. A nil vote under Luxembourg law means a vote that does not show clearly the intention of the shareholder to cast a vote for, against or to abstain with regard to a specific resolution.

Who can vote at the Annual General Meeting?

Shareholders as of the Record Date for the Annual General Meeting are entitled to vote at the Annual General Meeting. As of April 23, 2026, the Company had 56,388,649 Common Shares issued and outstanding.

“Shareholder of Record”: Common Shares Registered in Your Name

If on the Record Date your Common Shares were registered directly in your name with our transfer agent, Equiniti, then you are considered a shareholder of record with respect to those Common Shares.

As a shareholder of record, you may vote at the Annual General Meeting or vote by proxy. Whether or not you plan to attend the Annual General Meeting, we urge you to vote over the Internet, by telephone or by filling out and returning the proxy card.

“Beneficial Owner”: Common Shares Registered in the Name of a Broker or Nominee

If on the Record Date, you hold your Common Shares through a bank, brokerage firm or other agent and do not give instructions to your bank, brokerage firm or other agent as to how your Common Shares should be voted at the Annual General Meeting, the Common Shares that you hold through a bank, brokerage firm or other agent will not be voted on Proposals 1 through 9. The Company therefore urges all shareholders who hold their Common Shares through a bank, brokerage firm or other agent to promptly provide voting instructions in accordance with the procedures of their bank, brokerage firm or other agent.

How do I vote?

If you are a shareholder of record, you may use one of the following means:

All Common Shares represented by proxy for the Annual General Meeting duly executed and received by the Voter Deadline will be voted at the Annual General Meeting in accordance with the terms of the proxy. This includes votes submitted via the Internet or by telephone. Submitting your proxy, whether via the Internet, telephone or by mail if you requested a paper proxy card, will not affect your right to vote in person at the Annual General Meeting if you were a shareholder of record as of 11:59 P.M. CET on April 23, 2026, and should you decide to attend the Annual General Meeting and vote your shares at the Annual General Meeting. If you decide to vote in person at the Annual General Meeting, your previous proxy will be revoked and become void.

If you are not a shareholder of record, please refer to the voting instructions provided by your nominee that will direct you on how to vote your Common Shares.

Your vote is important. Whether or not you plan to attend the Annual General Meeting, we urge you to vote by proxy to ensure that your vote is counted. You may still attend the Annual General Meeting if you have already voted by proxy.

How do I revoke my proxy?

A shareholder giving a proxy has the power to revoke it at any time before it is voted by providing written notice to the Secretary of the Company or by delivering a later-dated proxy or by voting in person at the Annual General Meeting.

What is the quorum requirement for the Annual General Meeting?

There is no quorum requirement. The Annual General Meeting will proceed regardless of the number of Common Shares present or represented by proxy.

What are broker non-votes?

Broker non-votes occur when Common Shares held by a broker for a beneficial owner are not voted because (i) the broker did not receive voting instructions from the beneficial owner, and (ii) the broker lacked discretionary authority to vote the Common Shares on a particular resolution item.

Broker non-votes have no effect on the matters voted upon. Note that if you are a beneficial holder and do not provide specific voting instructions to your broker, the broker that holds your Common Shares will not be authorized to vote on Proposals 1 through 9. The appointment of the independent auditor (Proposal 10) and the ratification of the appointment of the independent registered public accounting firm (Proposal 11) are considered to be routine matters and, accordingly, even if you do not instruct your broker, bank or other nominee on how to vote the Common Shares in your account for Proposal 10 or Proposal 11, brokers will be permitted to exercise their discretionary authority to vote for the appointment of the independent auditor and the ratification of the appointment of the independent registered public accounting firm. We encourage you to provide voting instructions to your broker, whether or not you plan to attend the Annual General Meeting.

What if I return a proxy card but do not make specific choices?

All proxies will be voted in accordance with the instructions specified on the proxy card.

If you do not vote on specific resolution items and you hold your Common Shares through a broker, bank or other nominee and your broker, bank or other nominee does not have discretionary power to vote your shares, your Common Shares may constitute “broker non-votes” (as described above). Voting results will be tabulated and certified by the scrutineer of elections appointed for the Annual General Meeting.

Why did I receive a one-page notice in the mail regarding the Internet availability of proxy materials instead of a full set of proxy materials?

Pursuant to rules adopted by the SEC, the Company uses the Internet as the primary means of furnishing proxy materials to shareholders except where delivery of paper copies of the proxy materials is required by law or requested by a shareholder. Accordingly, on or around May 15, 2026, the Company will mail a Notice of Internet Availability of Proxy Materials (the “Notice of Internet Availability”) to the shareholders. All shareholders will have the ability to access the proxy materials on the website referred to in the Notice of Internet Availability or request a printed set of the proxy materials. Instructions on how to access the proxy materials over the Internet or to request a printed copy may be found in the Notice of Internet Availability and athttps://investor.orioncarbons.com/governance/Proxy-Statements/default.aspx. The Notice of Internet Availability also contains instructions on how to receive, free of charge, paper copies of the proxy materials. If you received the notice, then you will not receive a paper copy of the proxy materials unless you request one. The Company encourages shareholders to take advantage of the availability of the proxy materials on the Internet to help the environment and reduce costs to the Company associated with the physical printing and mailing of proxy materials.

How can I get electronic access to the proxy materials?

The Notice of Internet Availability will provide you with instructions regarding how to use the Internet to:

The Company’s proxy materials are also available athttps://investor.orioncarbons.com/governance/Proxy-Statements/default.aspx. This website address is included for reference only. The information contained on the Company’s website is not incorporated by reference into this Proxy Statement.

Choosing to receive future proxy materials by e-mail will save the Company the cost of printing and mailing documents to you. If you choose to receive future proxy materials by e-mail, you will receive an e-mail message next year with instructions containing a link to those materials and a link to the proxy voting website. Your election to receive proxy materials by e-mail will remain in effect until you terminate it.

Who is paying for this proxy solicitation?

The Company is paying the costs of the solicitation of proxies. Proxies may be solicited on behalf of the Company by our directors, officers, employees or agents in person or by telephone or other electronic means. We will also reimburse brokerage firms and other custodians, nominees and fiduciaries, upon request, for their reasonable expenses incurred in sending proxies and proxy materials to beneficial owners of our Common Shares. We have not retained an outside proxy solicitation firm to assist us with the solicitation of proxies.