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April 15, 2026

Dear Stockholder:

We cordially invite you to attend our 2026 Annual Meeting of Stockholders (the “Annual Meeting”) on Wednesday, May 20, 2026 at 8:30 a.m. (Eastern Time), to be conducted exclusively via live webcast at www.virtualshareholdermeeting.com/ECVT2026.

The Proxy Statement accompanying this letter describes the business we will consider at the Annual Meeting. Your vote is important regardless of the number of shares you own. Whether or not you plan to attend the Annual Meeting, we encourage you to consider the matters presented in the Proxy Statement and vote as soon as possible. Instructions for Internet and telephone voting are attached to your proxy card. If you prefer, you can vote by mail by completing and signing your proxy card and returning it in the enclosed envelope.

We hope that you will be able to join us on May 20^th.

Sincerely,

 

Kurt J. Bitting

The 2026 Annual Meeting of Stockholders (the “Annual Meeting”) of Ecovyst Inc. (the “Company”) will be a virtual meeting conducted exclusively via live webcast at www.virtualshareholdermeeting.com/ECVT2026 on Wednesday, May 20, 2026 at 8:30 a.m. (Eastern Time) for the following purposes as further described in the Proxy Statement accompanying this notice:

Stockholders of record at the close of business on April 13, 2026 are entitled to notice of, and entitled to vote at, the Annual Meeting and any adjournments or postponements thereof.

The Company has determined to hold a virtual Annual Meeting in 2026 in order to facilitate stockholder attendance and participation by enabling stockholders to participate from any location and at no cost. You will be able to attend the Annual Meeting online, vote your shares electronically and submit questions during the meeting by visiting www.virtualshareholdermeeting.com/ECVT2026. To participate in the virtual Annual Meeting, you will need the control number included on your proxy card or voting instruction form. The meeting webcast will begin promptly at 8:30 a.m. (Eastern Time). We encourage you to access the meeting prior to the start time. Online check-in will begin at 8:15 a.m. (Eastern Time), and you should allow ample time for the check-in procedures. If you encounter any difficulties accessing the virtual meeting during the check-in or meeting time, please call the technical support number that will be posted on the virtual stockholder meeting log in page.

By Order of the Board of Directors,

 

Joseph S. Koscinski

Wayne, Pennsylvania

April 15, 2026

This Proxy Statement provides information for stockholders of Ecovyst Inc. (“we,” “us,” “our,” “Ecovyst” and the “Company”), as part of the solicitation of proxies by the Company and its board of directors (the “Board”) from holders of the outstanding shares of the Company’s common stock, par value $0.01 per share (“Common Stock”), for use at the Company’s 2026 annual meeting of stockholders to be held as a virtual meeting conducted exclusively via live webcast at www.virtualshareholdermeeting.com/ECVT2026 on Wednesday, May 20, 2026 at 8:30 a.m. (Eastern Time), and at any adjournments or postponements thereof (the “Annual Meeting”).

At the Annual Meeting, stockholders will be asked to vote either directly or by proxy on the following matters discussed herein:

This Proxy Statement, the proxy card, and the Annual Report to stockholders for the fiscal year ended December 31, 2025 (the “Annual Report”) are being first mailed to stockholders on or about April 15, 2026.

IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE

ANNUAL MEETING TO BE HELD ON MAY 20, 2026: THIS PROXY STATEMENT, THE ANNUAL

REPORT AND THE FORM 10-K FOR FISCAL 2025 ARE AVAILABLE AT WWW.PROXYVOTE.COM.

Although we encourage you to read this Proxy Statement in its entirety, we include this Question and Answers section to provide some background information and brief answers to several questions you might have about the Annual Meeting.

Our Board is providing these materials to you in connection with our Annual Meeting, which will be a virtual meeting conducted exclusively via live webcast at www.virtualshareholdermeeting.com/ECVT2026 on May 20, 2026 at 8:30 a.m. (Eastern Time). Stockholders are invited to attend the Annual Meeting online and are requested to vote on the proposals described herein.

This Proxy Statement contains information relating to the proposals to be voted on at the Annual Meeting, the voting process, the compensation of our directors and named executive officers, and other required information.

There are three proposals scheduled to be voted on at the Annual Meeting:

We will also consider other business properly brought before the Annual Meeting.

The Company has decided to hold a virtual annual meeting in order to facilitate stockholder attendance and participation by enabling stockholders to participate from any location and at no cost.

To participate in the virtual meeting, you will need the control number included on your proxy card or voting instruction form. The meeting webcast will begin promptly at 8:30 a.m. (Eastern Time). We encourage you to access the meeting prior to the start time. Online check-in will begin at 8:15 a.m. (Eastern Time), and you should allow ample time for the check-in procedures. If you encounter any difficulties accessing the virtual meeting during the check-in or meeting time, please call the technical support number that will be posted on the virtual stockholder meeting log-in page.

We are committed to ensuring that stockholders will be afforded substantially the same rights and opportunities to participate as they would at an in-person meeting. You will be able to attend the Annual Meeting online, vote your shares electronically and submit questions during the meeting by visiting www.virtualshareholdermeeting.com/ECVT2026. We will try to answer as many stockholder-submitted questions as time permits that comply with the meeting rules of conduct. However, we reserve the right to edit inappropriate language or to exclude questions that are not pertinent to meeting matters or that are otherwise inappropriate. If we receive substantially similar questions, we will group such questions together and provide a single response to avoid repetition.

You may vote all shares of Common Stock that you owned as of the close of business on the record date, April 13, 2026. You may cast one vote per share, including shares (i) held directly in your name as the stockholder of record and (ii) held for you as the beneficial owner through a broker, bank, or other nominee. The proxy card will indicate the number of shares that you are entitled to vote.

As of April 13, 2026, there were 109,450,306 shares of Common Stock outstanding, all of which are entitled to be voted at the Annual Meeting. A list of stockholders will be available at our headquarters at 600 Lee Road, Suite 200 Wayne, Pennsylvania 19087 for a period of at least ten days prior to the Annual Meeting.

Many of our stockholders hold their shares through brokers, banks, or other nominees, rather than directly in their own names. As summarized below, there are differences between being a stockholder of record and a beneficial owner of shares held in street name.

Stockholder of record: If your shares are registered directly in your name with our transfer agent, Equiniti Trust Company, LLC, you are the stockholder of record with respect to those shares and the proxy materials were sent directly to you. As the stockholder of record, you have the right to grant your voting proxy directly to the individual named on the proxy card and to vote at the Annual Meeting.

Beneficial owner of shares held in street name: If your shares are held in a brokerage account or by a bank or other nominee, then you are the “beneficial owner of shares held in street name” and the proxy materials were forwarded to you by your broker, bank or other nominee, who is considered to be the stockholder of record. As a beneficial owner of shares held in street name, you have the right to instruct the broker, bank or other nominee holding your shares how to vote your shares.

There are four ways to vote:

All shares represented by valid proxies received prior to the taking of the vote at the Annual Meeting will be voted and, where a stockholder specifies by means of the proxy a choice with respect to any matter to be acted upon, the shares will be voted in accordance with the stockholder’s instructions. Even if you plan on attending the Annual Meeting online, we encourage you to vote your shares in advance online, by phone, or by mail to ensure that your vote will be represented at the Annual Meeting.

You may revoke your proxy and change your vote at any time before the taking of the vote at the Annual Meeting.

Stockholders of record. If you are a stockholder of record and you:

then the person named as proxy holder, Joseph S. Koscinski, will vote your shares in the manner recommended by the Board on all matters presented in this Proxy Statement and as he may determine in his best judgment with respect to any other matters properly presented for a vote at the Annual Meeting.

Beneficial owners of shares held in street name. If you are a beneficial owner of shares held in street name and do not provide the broker, bank or other nominee that holds your shares with specific voting instructions, then the broker, bank or other nominee that holds your shares may generally vote your shares in their discretion on “routine” matters, but cannot vote on “non-routine” matters.

The following proposal is considered a routine matter:

A broker, bank or other nominee may generally vote in their discretion on routine matters, and therefore no broker non-votes (as described below) are expected in connection with Proposal 3.

The following proposals are considered non-routine matters:

If the broker, bank or other nominee that holds your shares does not receive instructions from you on how to vote your shares on a non-routine matter, that broker, bank or other nominee will inform the inspector of election that it does not have the authority to vote on the matter with respect to your shares. This is generally referred to as a “broker non-vote.” Therefore, broker non-votes may exist in connection with Proposals 1 and 2.

The presence at the Annual Meeting, online or by proxy, of the holders of Common Stock representing a majority of the shares outstanding and entitled to vote for the election of directors is necessary to constitute a quorum for all purposes.

Proposal 1: Election of directors. Directors are elected by a plurality of the votes cast. Therefore, if you do not vote for a nominee, or you “withhold authority to vote” for a nominee, your vote will not count either “for” or “against” the nominee.

Proposal 2: Advisory vote on the say-on-pay proposal. Generally, approval of any matter presented to stockholders (other than the election of directors) requires the affirmative vote of a majority of the votes cast on the matter. However, because this proposal asks for a non-binding, advisory vote, there is no “required” vote that would constitute approval.

Proposal 3: Ratification of PwC. The affirmative vote of a majority of the votes cast is required to ratify the selection of PwC as the independent registered public accounting firm of the Company for the fiscal year ending December 31, 2026.

Broker non-votes and abstentions are counted as present and entitled to vote for purposes of determining whether a quorum is present. Broker non-votes and abstentions will have no effect on the outcome of Proposals 1 and 2. No broker non-votes are expected in connection with Proposal 3.

The costs of preparing, assembling, and mailing this Proxy Statement, the proxy card, and the Annual Report, along with the cost of posting the proxy materials on a website, are to be borne by us. In addition to the use of mail, our directors, officers, and employees may solicit proxies personally and by telephone, facsimile, and other electronic means. They will receive no compensation in addition to their regular compensation. We may request banks, brokers and other custodians, nominees, and fiduciaries forward copies of the proxy materials to their principals and request authority for the execution of proxies. We may reimburse these banks, brokers, and other custodians for their expenses in doing so.

If you have any questions about the Annual Meeting, voting or your ownership of our Common Stock, please call us at (484) 617-1200 or send an email to InvestorRelations@ecovyst.com.

The Company currently has a classified Board consisting of five directors with terms expiring in 2026 (Class III) and three directors with terms expiring in 2027 (Class I). At the 2024 annual meeting of stockholders, the stockholders voted to approve a proposal to amend the Company’s Second Restated Certificate of Incorporation, as amended and corrected (the “Charter”), to eliminate the classified board structure beginning at the 2025 annual meeting of stockholders (the “Charter Amendment”). The Charter Amendment provides that, subject to the special rights of the holders of any series of Preferred Stock to elect directors, commencing with the election of directors at this Annual Meeting, there shall be a single class of directors, Class I, with all directors of such class having a term that expires at the annual meeting of stockholders to be held in 2027. From and after the annual meeting of stockholders to be held in 2027, the Board shall cease to be classified, and thereafter, all directors shall be elected for terms expiring at the next succeeding annual meeting of stockholders. Ms. Ward and Messrs Brown, Bitting, Bradley, and Fogarty are the Class III directors whose terms expire at the Annual Meeting. Ms. Ward has decided not to stand for re-election.

Our Board has nominated, and stockholders are being asked to re-elect, Messrs. Brown, Bitting, Bradley, and Fogarty as Class I directors with a one-year term expiring at our 2027 annual meeting of stockholders. The Board has also nominated Patti A. Humble for election as a Class I director for a one-year term expiring at our 2027 annual meeting of stockholders.

Ms. Humble, 61, has over 30 years of experience as an accounting and finance executive. From August 2019 until her retirement in December 2024, she served as Chief Accounting Officer for United Parcel Service, a global shipping, receiving and supply chain management company. In addition, she also served in a variety of other capacities with United Parcel Service, including as Vice President, External Reporting; Vice President, Financial Planning & Analysis; Vice President, Global Accounting Shared Services Centers; Controller, Statutory Reporting; Business Unit Controller, International Accounting, for UPS Supply Chain Solutions; Controller, Technical Accounting; Controller, Mergers & Acquisitions; and Director, Accounting and Human Resources at UPS Yamato Partnership dba Unistar Air Cargo joint venture. Since July 2021, she has served as a director of the Institute of Management Accountants, and she currently serves as chair of its Audit Committee and previously as a member of its governance and strategic planning committees. Since September 2021, she has served as a member of the advisory board of the University of Iowa Tippie College of Business Professional Accounting Council. From 2019 until 2023, she also served as a member of the Kennesaw State University Accounting Advisory Committee. Ms. Humble also is a certified public accountant, certified Global Management Accountant, Certified Management Accountant and is certified in Financial Management. In addition, she holds a National Association of Corporate Directors certification. Ms. Humble holds a Bachelor of Business Administration (with high distinction) in Accounting from the University of Iowa. Ms. Humble was selected from among a group of candidates identified by the Nominating and Corporate Governance Committee as part of the Board's recruitment and refreshment process and was nominated for election to the Board as a result of her substantial financial and accounting experience as well as her general business experience.

If elected, the nominees will each hold office until our 2027 annual meeting of stockholders, subject to the election and qualification of each such nominee’s successor and such successor’s earlier death, resignation, or removal.

Each of the above nominees has indicated his or her willingness to serve, if elected. However, if a nominee should be unable to serve, the shares of Common Stock represented by proxies may be voted for a substitute nominee designated by the Board. Management has no reason to believe that any of the above-mentioned persons will not serve his or her term as a director.

We believe that all our nominees possess the professional and personal qualifications necessary for Board service, and we have highlighted particularly noteworthy attributes for each director nominee in the individual biographies below.

The following table sets forth the name, age, and class, as of March 1, 2026, of individuals who currently serve as directors on our Board.

In accordance with our non-employee director compensation policy, which has been in place since the time of our initial public offering (“IPO”), each of our non-employee directors is compensated as follows:

Mr. Fogarty receives the standard director pay package outlined above, plus a $250,000 fee differential for his service as Non-Executive Chairman. The fee differential is paid in the form of an additional annual cash retainer of $50,000 and additional RSUs with a grant date fair value of $200,000. As is the case with the RSUs granted to other non-employee directors, the RSUs which form a part of the fee differential provide for vesting after one year of continued service as director or upon an earlier occurrence of a change in control.

All cash and equity awards granted under the non-employee director compensation policy are granted under, and subject to the limits of, the Ecovyst Inc. 2017 Omnibus Incentive Plan, as amended and restated (the “2017 Plan”). Annual cash retainers are paid quarterly in arrears.

On February 3, 2025, the Company granted 25,674 RSUs to each of Messrs. Althoff, Bradley, and Brown, Ms. Catalano, Ms. Lorance and Ms. Ward. Each RSU award vested subject to the director’s continued service through February 3, 2026 (or upon an earlier occurrence of a change in control). In addition, on February 3, 2025 the Company granted 51,348 RSUs to Mr. Fogarty, consisting of 25,674 RSUs for his service on the Board and 25,674 RSUs as a part of the fee differential for his service as Non-Executive Chair of the Board. Each award of RSUs vested subject to Mr. Fogarty’s continued service through February 3, 2026 (or upon an earlier occurrence of a change in control).

Under our stock ownership guidelines applicable to our non-employee directors, each of our non-employee directors is expected to have ownership of Company stock in an amount equal to at least $625,000 and, until they satisfy their ownership requirements, are subject to a holding requirement with respect to 100% of the shares they acquire upon the vesting or exercise of equity-based awards (on an after-tax basis).

The following table summarizes the ownership of our Common Stock as of December 31, 2025 by our non-employee directors who were serving on our Board as of December 31, 2025:

The following table sets forth certain information with respect to cash compensation and stock awards granted to our non-employee directors in 2025. Mr. Bitting did not receive compensation for his service on our Board in 2025. The compensation that he received in his capacity as an executive officer of the Company is reported in the Summary Compensation Table below.

As a result of the Board’s review of the Company’s corporate governance framework in 2023 to determine if changes to our policies and practices were warranted, the Board included the Charter Amendment on the ballot for the 2024 annual meeting of stockholders. The stockholders voted to approve the Charter Amendment, which provides that following a two-year transition period, the Company’s stockholders will vote on the election of the entire Board on an annual basis. The Board’s decision to propose the Charter Amendment at the 2024 annual meeting of stockholders was informed by the current trend in corporate governance leading away from classified boards in favor of electing all directors annually, and the Board’s recognition that a classified board structure may reduce directors’ accountability to stockholders because stockholders are not provided the opportunity to express a view on each director’s performance by means of an annual vote.

The Board is committed to adhering to best practices in corporate governance. From time to time, the Board will continue to evaluate the governance structure for the Company and may make changes if they are deemed to be in the best interest of the Company and its stockholders.

Our Board currently consists of eight members, with Mr. Fogarty serving as Non-Executive Chairman of the Board. In this capacity, Mr. Fogarty leads all meetings of the Board and of its non-management, independent directors consistent with the provisions of our Corporate Governance Guidelines. Our Board and its committees meet periodically throughout the year, as needed, to oversee management of the Company’s business and affairs for the benefit of its stockholders. During 2025, the Board held ten meetings. Each director attended more than 75% of Board meetings and meetings of its applicable committees on which such directors served in 2025 (during the periods when they served). We encourage, but do not require, our directors to attend annual meetings of stockholders and all of the directors attended our 2025 annual meeting of stockholders.

As set forth in our Corporate Governance Guidelines, our Board and its committees regularly have access to those Company employees as the Board or its committees deems necessary to effectively oversee the management of the Company. At each of our regularly scheduled Board and committee meetings, our executive management team and other Company employees provide information regarding their respective businesses and functions and the Board members have the opportunity to pose questions to such executives and employees.

Also consistent with our Corporate Governance Guidelines, the Board and its committees have the opportunity to engage outside advisers to provide such advice as the Board or its committees requires to effectively oversee the management of the Company.

Periodically throughout the year, the non-employee and independent directors meet in executive session without members of management present. These meetings allow such non-employee and independent directors to discuss issues of importance to the Company, including the business and affairs of the Company and matters concerning management, without any member of management present. As noted above, Mr. Fogarty presides over all such meetings. During 2025, the non-employee and independent directors met without management present at eight meetings of the Board.

Our Corporate Governance Guidelines provide that our Board shall consist of the number of directors who are independent as is required and determined in accordance with applicable laws and regulations and requirements of the New York Stock Exchange (“NYSE”) and SEC rules. Under our Corporate Governance Guidelines, an “independent” director is one who meets the qualification requirements for being an independent director under applicable laws and the corporate governance listing standards of the NYSE. Our Board evaluates any relationships between each director or director nominee and the Company and makes an affirmative determination whether or not such director or director nominee is independent. As a result of this review, our Board has affirmatively determined that each current member of our Board, with the exception of Mr. Bitting, our Chief Executive Officer, is independent under applicable laws and the corporate governance listing standards of the NYSE and Patti A. Humble, the director nominee for election at this Annual Meeting, is independent under applicable laws and the corporate governance listing standards of the NYSE.

Our Corporate Governance Guidelines provide that the Nominating and Corporate Governance Committee is responsible for reporting annually to the Board an evaluation of the overall performance of the Board. In addition, the written charters of the Audit Committee, Compensation Committee and Nominating and Corporate Governance Committee provide that each such committee shall evaluate its performance on an annual basis using criteria that it has developed and shall report to the Board on its findings. The Board and each committee of the Board conducts such performance reviews on an annual basis.

During fiscal 2025, the Board had four standing committees: the Audit Committee, the Compensation Committee, the Nominating and Corporate Governance Committee, and the Health, Safety, Environment and Security Committee. The charter for each committee can be found in the Investors section of our website at https://investor.ecovyst.com under “Management & Governance” and more information about the primary roles and responsibilities of each committee is set forth below. The members of each committee are appointed by the Board, and, consistent with our Corporate Governance Guidelines, the Board takes into consideration the particular skills of Board members when appointing members to each committee. In addition, from time to time, special committees may be established under the direction of the Board when necessary to address specific issues.

The chairpersons of the standing Board committees regularly provide reports to the full Board regarding the topics of discussions of their respective committee meetings and actions taken at such committee meetings.

The table below provides information about the membership of our standing Board committees during fiscal 2025:

Additional information regarding our Board committees and their roles is set forth below:

Audit Committee — Among other matters, the Audit Committee’s duties and responsibilities are to:

The members of our Audit Committee as of the date of this Proxy Statement are Bryan K. Brown (Chair), Susan F. Ward and Sarah Lorance. Our Board has determined that Mr. Brown, Ms. Ward, and Ms. Lorance each meet the independence requirements of Rule 10A-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and the governance and listing standards of the NYSE. All of the members of the Audit Committee are financially literate and each of Mr. Brown, Ms. Ward, and Ms. Lorance and is also considered an “audit committee financial expert” within the meaning of the applicable rules of the SEC.

Compensation Committee — Among other matters, the Compensation Committee’s duties and responsibilities are to:

The Compensation Committee as of the date of this Proxy Statement consists of David A. Bradley (Chair), Anna Catalano and Kevin M. Fogarty. Our Board has determined that each member of the Compensation Committee meets the independence requirements under the governance and listing standards of the NYSE and are “non-employee directors” under Rule 16b-3 of the Exchange Act.

Nominating and Corporate Governance Committee — Among other matters, the Nominating and Corporate Governance Committee’s duties and responsibilities are to:

The Nominating and Corporate Governance Committee as of the date of this Proxy Statement consists of Anna C. Catalano (Chair), Donald Althoff, and Bryan K. Brown. Our Board has determined that each member of the Nominating and Corporate Governance Committee is independent as defined under the governance and listing standards of the NYSE.

Health, Safety, Environment and Security Committee — Among other matters, the Health, Safety, Environment and Security Committee’s duties and responsibilities are to:

The Health, Safety, Environment and Security Committee as of the date of this Proxy Statement consists of Donald Althoff (Chair), Kurt Bitting, and David A. Bradley.

None of our executive officers serve as a member of the board of directors or compensation committee, or other committee serving an equivalent function, of any other entity that has one or more of its executive officers serving as a member of our Board or Compensation Committee.

It is management’s responsibility to manage risk and bring to the Board’s attention risks that are material to the Company. The Board has oversight responsibility for the systems established to report and monitor the most significant risks applicable to the Company. The Board believes that evaluating the executive team’s management of the various risks confronting the Company is one of its most important areas of oversight.

In accordance with this responsibility, the Board administers its risk oversight role directly and through its committee structure and the committees’ regular reports to the Board at Board meetings. The Board reviews strategic, financial and execution risks and exposures associated with the annual plan and long-term plans, material litigation and other matters that may present material risk to the Company’s operations, plans or prospects, the Company’s reputation, acquisitions and divestitures, senior management succession planning and enterprise risk management.

In connection with risk oversight, Board committees assist with the review, assessment and oversight of the Company’s risk management efforts. The chart below sets forth some examples of the roles Board committees play in risk oversight:

We have an insider trading policy governing the purchase, sale and other dispositions of our securities that applies to our directors, officers, employees, other covered persons, and to the company itself (the “Insider Trading Policy”). We believe that our Insider Trading Policy is reasonably designed to promote compliance with insider trading laws, rules and regulations, as well as applicable NYSE listing standards.

Our Insider Trading Policy also prohibits our directors, officers and employees from entering into hedging or monetization transactions, including through the use of financial instruments such as prepaid variable forwards, equity swaps, collars and exchange funds, because such transactions may permit a director, officer or employee to continue to own securities obtained through our employee benefit plans or otherwise, but without the full risks and rewards of ownership. When that occurs, the individual may no longer have the same objectives as our other stockholders.

A copy of the Insider Trading Policy can be found in Exhibit 19.1 of the Company’s Form 10-K for the fiscal year ended December 31, 2025.

The Company maintains an enterprise risk management process that is designed to identify, assess, mitigate and monitor the risks that the organization faces. The process is guided by an Enterprise Risk Management Charter, which sets forth the primary goals of the

program and is overseen, internally, by a Risk Council that is comprised of members of the executive team, as well as externally through the Audit Committee of the Board. In conducting the program, the Company engages in a series of risk identification workshops in its business units and functions, including finance, legal, environment and sustainability, health and safety, strategy and others. Upon completion of the workshops, the Company develops a listing of the identified risks and risk definitions. Those risks then are evaluated through a risk assessment process in which Company personnel assess the severity, likelihood and existing mitigation effectiveness relating to the identified risks. After compiling the results of the assessment process in 2025, individual risks are assigned to one or more “risk owners” who review the existing mitigation efforts and steps that should be taken to further mitigate the effects of such risks. Those risk owner reviews are then presented to the Audit Committee at its regularly scheduled meetings.

The Board believes it is a priority to engage in thoughtful, deliberate director refreshment that expands diversity in experience and critical perspectives in order to benefit all of Ecovyst’s stakeholders. All our current Board members have joined the Board as directors since 2020.

We seek to have a Board that represents diversity as to experience, gender and ethnicity/race, but we do not have a formal policy with respect to diversity. We also seek a Board that reflects a range of talents, ages, tenures, skills, character and expertise, particularly in the areas of leadership, operations, risk management, accounting and finance, strategic planning and the industries in which we operate, sufficient to provide sound and prudent guidance with respect to our operations and interests.

Our Board currently is comprised of eight members, and we believe their ages, experiences, gender and ethnic diversities and skills collectively bring a broad range of outlooks and talents to their services to the Company. For example, four of our current directors – or 50% of the Board composition – bring gender or racial/ethnic diversity to the Board. Two members of our Board also are armed forces veterans. The illustrations below show the make-up of our current Board of Directors based on age, Board tenure, independence, and gender and racial/ethnic diversity.

 

We also strive to recruit and retain qualified directors who bring a diversity of thought and experience to our Board. The chart below shows certain of the various skills and experiences that our Board believes are important to the oversight of the Company and the number of current Board members who bring such skill or experience to the Board.

 

Under its charter, our Nominating and Corporate Governance Committee is responsible for recommending to the Board candidates to stand for election to the Board at the Company’s annual meeting of stockholders and candidates to fill vacancies on the Board that may occur between annual meetings of stockholders. The Nominating and Corporate Governance Committee may receive suggestions for new directors from a number of sources, including Board members and our Chief Executive Officer, and may also, in its discretion, employ a third-party search firm to assist in identifying candidates for director. The Corporate Governance Guidelines provide that each director should possess the combination of skills, professional experience and diversity of viewpoints necessary to oversee the Company’s business. It is the policy of the Board that directors should possess the highest personal and professional ethics, integrity and values, and be committed to representing the long-term interests of the Company’s stakeholders. Board members are expected to become and remain informed about the Company, its business and its industry and rigorously prepare for, attend and participate in all Board and applicable committee meetings. The Nominating and Corporate Governance Committee evaluates each individual in the context of the skills, character, diversity and expertise of the Board as a whole, with the objective of recommending directors that can best perpetuate the success of the Company’s business and represent stockholder interests through the exercise of sound judgment using their diversity of experience. In addition, the Nominating and Corporate Governance Committee considers, in light of our business, each director nominee’s experience, qualifications, attributes and skills that are identified in the biographical and other information contained in this Proxy Statement.

The Nominating and Corporate Governance Committee considers properly submitted recommendations for candidates to the Board from stockholders in accordance with our Bylaws. Any stockholder may submit in writing a candidate for consideration for each

stockholder meeting at which directors are to be elected by no later than the close of business on the 90th day nor earlier than the close of business on the 120th day prior to the anniversary date of the prior year’s annual meeting, except that if the annual meeting is set for a date that is not within 30 days of such anniversary date, we must receive the notice no later than the close of business on the tenth day following the day on which the date of the annual meeting is first disclosed in a public announcement. Any stockholder recommendations for consideration by the Nominating and Corporate Governance Committee should include the candidate’s name, biographical information and the information required by Section 1.2 of our Bylaws. Recommendations should be sent to c/o Secretary, Ecovyst Inc., 600 Lee Road, Suite 200, Wayne, Pennsylvania 19087. The Nominating and Corporate Governance Committee evaluates candidates for director recommended by stockholders in the same manner as candidates from other sources. The Nominating and Corporate Governance Committee will determine whether to interview any candidates and may seek additional information about candidates from third-party sources.

Under our Corporate Governance Guidelines, our Board may select a Chairperson at any time. Mr. Fogarty has served as our Board Non-Executive Chairman since April 2022. As non-Executive Chairman, Mr. Fogarty has the power to call meetings of the independent directors and to preside over such meetings. The Board believes that utilizing a Non-Executive Chairman and the exercise of key Board oversight responsibilities by independent directors is currently in the best interest of our stockholders.

Since our IPO, we have maintained a classified board structure in which directors are divided into three classes and directors of one class are elected each year to serve a three-year term. The Board believed that this classified board structure promoted continuity and stability of strategy, encouraged a long-term perspective by Company management and facilitated the ability of the Board to focus on creating long-term stockholder value. In 2023, the Board reevaluated the classified board structure and concluded that it would be in the best interests of the Company and its stockholders to propose the Charter Amendment, which the stockholders voted to approve at the 2024 annual meeting of stockholders. Pursuant to the Charter Amendment, annual elections of directors have been phased in beginning at the 2025 Annual Meeting, with the declassification process being completed at the 2027 annual meeting of stockholders.

The Chief Executive Officer reviews succession planning and management development with the Board and its applicable committees on an annual basis. This succession planning includes the development of policies and principles for selection of the Chief Executive Officer, including succession in the event of an emergency or retirement.

Our Corporate Governance Guidelines provide that in an uncontested election of directors, any nominee for director who receives a greater number of votes “withheld” from his or her election than votes “for” such election shall promptly tender his or her resignation following certification of the stockholder vote. The Board shall determine whether or not to accept such resignation within a period of 120 days following the stockholder vote, and will promptly publicly disclose its decision to accept or reject the resignation and the reasons for doing so.

Our Corporate Governance Guidelines provide that a director who is also an employee of the Company shall be deemed to have offered his or her resignation from the Board to the Nominating and Corporate Governance Committee at the same time he or she retires, resigns or is terminated from employment with the Company. In addition, directors who retire or otherwise change from the principal occupation or background association they held when they were originally invited to the Board should provide notice to the Nominating and Corporate Governance Committee or the Board and offer to resign from the Board. The Board does not believe that such directors should necessarily leave the Board, but there should be an opportunity for the Board to review the continued appropriateness of such director’s membership under these circumstances.

The Board also believes that each director should advise the Nominating and Corporate Governance Committee in advance of accepting an invitation to serve as a member on another board of directors. In general, the Board does not have a policy limiting the number of other public company boards of directors upon which a director may sit. However, the Nominating and Corporate Governance Committee shall consider the number of other boards of directors (or comparable governing bodies), particularly with respect to public companies, on which a prospective nominee is a member. Although the Board does not impose a limit on outside directorships, it does recognize the substantial time commitments attendant to membership on the Board and expects that directors devote all such time as is necessary to fulfill their accompanying responsibilities, both in terms of preparation for, and attendance and participation at, meetings.

Pursuant to our Audit Committee charter and the NYSE listing rules, members may serve on no more than three public company audit committees simultaneously without prior review and determination by the Board that such simultaneous service would not impair the ability of such member to effectively serve on the Company’s Audit Committee.

Pursuant to the retirement and tenure policy contained in the Corporate Governance Guidelines, upon reaching the age of 75, a director shall offer to resign from the Board and all committees thereof effective upon the completion of his or her then-current term, and the Nominating and Corporate Governance Committee shall review the continued appropriateness of that director’s membership on the Board under the circumstances and make a recommendation to the full Board as to whether to accept or decline such offer to resign.

In addition, a non-employee director who has served on the Board for 12 consecutive years shall offer to resign from the Board and all committees thereof effective upon the completion of his or her then-current term, and the Nominating and Corporate Governance Committee shall review the continued appropriateness of that non-employee director’s membership on the Board under the circumstances and make a recommendation to the full Board as to whether to accept or decline such offer to resign. The 12 year service period shall be calculated beginning on the date the non-employee director first joined the Board (whether as a result of election by the Board to fill a director vacancy or election by the stockholders) or, if applicable, the date of the Company’s IPO, whichever is later.

Our Board adopted a Code of Ethics that applies to all of certain senior executive and financial officers, including our Chief Executive Officer and Chief Financial Officer. The full text of our Code of Ethics is available by clicking on “Management & Governance” in the Investors section of our website, www.ecovyst.com.” We intend to post any amendment to, or a waiver from, a provision of our Code of Ethics that applies to our principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions and that relates to any element of the Code of Ethics definition enumerated in paragraph (b) of Item 406 of Regulation S-K by posting such on the same website.

Stockholders and other interested parties may communicate directly with the Board, the non-employee directors or the independent directors as a group, or specified individual directors by writing to such individual or group c/o Secretary, Ecovyst Inc., 600 Lee Road, Suite 200 Wayne, Pennsylvania 19087. The Secretary will forward such communications to the relevant group or individual at or prior to the next meeting of the Board. The Secretary may exclude a communication if it is illegal, unduly hostile or threatening or similarly inappropriate.

The current versions of our Corporate Governance Guidelines, Code of Conduct, Code of Ethics for Senior Executive and Financial Officers and charters for our Audit Committee, Compensation Committee, Nominating and Corporate Governance Committee and Health, Safety, Environment and Security Committee are available by clicking on “Management & Governance” in the Investors section of our website, www.ecovyst.com. These materials are also available in print free of charge to stockholders, upon written request to c/o Secretary, Ecovyst Inc., 600 Lee Road, Suite 200, Wayne, Pennsylvania 19087.

Sustainability is intertwined with our daily business and is reinforced through our strategy and values. We strive to create sustainable products that are safe for the environment, and to reduce waste and increase efficiencies for our customers and stakeholders. We believe that our products contribute to lower emissions and cleaner air. We are committed to creating environmentally responsible products that we believe make a difference in people’s daily lives and for our planet.

While offering products and services that help our customers to advance their own sustainability goals, we also work to advance our commitment to maintain sound environmental, social and governance practices, policies and procedures. For example, we:

The sections that follow provide some highlights of our ESG programs and procedures.

Environmental Stewardship. Our products and technologies continue to address our customers’ sustainability challenges, tightening global regulatory standards and changing consumer preferences. We provide regeneration services that avoid significant landfill or deep well disposal of spent, or used, sulfuric acid and related hazardous and nonhazardous waste streams.

As part of our sustainability commitment regarding our own operations, at our facilities, we apply the principles of the Environmental Management standard of the International Organization for Standardization (ISO 14001) and adhere to the Responsible Care® RC14001 Technical Specifications of the American Chemistry Council (“ACC”).

We maintain policies and procedures to monitor and control HSE risks, and to enable compliance with applicable state, national, and international HSE requirements. We have comprehensive HSE compliance, auditing and management programs in place to assist in our compliance with applicable regulatory requirements and with internal policies and procedures, as appropriate. Each Ecovyst facility has developed and implemented specific critical occupational health, safety, environmental, security and loss control programs.

We also have strong Health and Safety (“H&S”) and Environmental and Sustainability (“E&S”) organizations staffed by professionals who are responsible for health, safety, process safety, sustainability, product stewardship and product safety regulatory compliance. Our H&S and E&S organizational structures feature executive management-level leadership, active oversight by our Board and dedicated H&S and E&S experts on staff. We have a Health, Safety and Process Safety Management leadership and also have Regional H&S Specialists and Managers who are embedded in the field and provide H&S expertise and support to operating sites. In addition, our Vice President — Environment and Sustainability oversees a team of regional Environmental Specialists, Managers and Directors that serve our operating sites.

As an ACC Responsible Care® member company, we continue to monitor and report our HSE metrics annually. Most recently, our 2024 sustainability data for Scope 1 and 2 greenhouse gas (“GHG”) emissions, water withdrawal and the mass of hazardous and nonhazardous waste generated was verified. GHG emissions are verified by an independent third party to a reasonable level of assurance in accordance with the requirements of the WRI/WBSCD GHG Protocol Corporate Accounting and Reporting Standard, revised edition (2004, as amended in 2013) and the GHG Protocol Scope 2 Guidance (2015). The independent third party also verified the Company’s metrics for water withdrawal and waste generated to a reasonable level of assurance. We included the assured data on our website and in our 2024 Sustainability Report, which we published in June 2025.

We also maintain a Product Safety and Product Stewardship management system that is compliant with the RC14001 technical specification and is supported by a dedicated Product Stewardship professional. We conduct Product Stewardship reviews as part of new product development and routinely evaluate product safety risk for raw materials, intermediates, and finished products.

Human Capital. We seek to act in a socially responsible manner through our various HSE programs as described above, our commitment to fostering a workplace culture where every employee feels respected, valued and empowered to contribute their best, engagement with and support for the communities where we live and work, and advancement of socially responsible business practices through partnerships and other industry frameworks.

We believe that a diverse range of experiences, backgrounds and perspectives strengthens our teams and supports innovation, safety and long-term success. We are guided by our core SHINE values (Stewardship, High Standards, Integrity and Engagement) and are intentional in cultivating a workplace where all team members can grow, contribute meaningfully, and thrive.

We are committed to providing equal employment opportunities for all employees and applicants for employment, and do not discriminate on the basis of race, color, religion, sex, sexual orientation, pregnancy, gender identity and expression, national origin, disability, age (40 or above), ancestry, genetic information, marital status, veteran status or any other classification protected by law. This commitment applies to all terms and conditions of employment, including recruiting, hiring, placement, advancement, training, transfer, demotion, lay off and recall, termination, compensation and benefits.

It is our policy to comply with all applicable laws and regulations in each jurisdiction in which we operate in order to provide appropriate working conditions for our colleagues. This means that we comply with applicable laws regarding the employment relationship including those that (1) prohibit child labor, (2) set acceptable working conditions and working hours, (3) provide for fair wages, including minimum wages and overtime, (4) prohibit forced or bonded labor, (5) permit freedom of association and collective bargaining, and (6) prohibit discrimination, harassment and other forms of degrading or inhumane treatment. Using tools such as our Supplier Code of Conduct and contractual provisions, we also hold our business partners to these same standards.

We support our people by acknowledging our workforce is key to our success. We offer highly competitive salaries, benefits, developmental opportunities and work/life balance. We proactively seek to attract, incentivize and retain a talented and motivated workforce. Our global performance management and succession planning processes are designed to provide sufficiently talented personnel to fill key leadership, innovation and manufacturing roles well into the future and to better prepare employees for their future at the Company.

We review our compensation and benefits programs periodically to ensure continued competitiveness. Our benefit programs are designed to help protect the health and financial well-being of our full-time employees and their family members, offering a choice of several medical & dental plans, as well as vision, flexible spending accounts, short-term and long-term disability insurance and an employee assistance program. To help our employees prepare for their future, we also offer a defined contribution savings plan, which includes company contributions.

We benefit from our talented, dedicated and diverse employee population and we actively seek to maintain a workforce that reflects the communities in which we operate. As of December 31, 2025, we had 617 employees, all of which were employed in the United States. Further, as of December 31, 2025, approximately 20% of our executives, managers and professionals were females and 20% were non-white males. As of December 31, 2025, approximately 37% of our employees were represented by a union. We believe we have good relationships with our employees and their respective works councils, unions and other bargaining representatives.

Our strengths, supported by our core values of SHINE, foster a rich culture founded on diversity of thought. We firmly believe that success is achieved through the intellect and commitment of our people, so we employ a long-term human capital program to attract, retain and develop talent for the future. We are proud of our highly collaborative teams that enable an inclusive workplace where employees are encouraged to bring their own experiences to promote innovation from all levels of the organization. This constructive work environment is supplemented with a fully integrated on-line performance management process that improves the communication of aligned goals, encourages consistent feedback and furthers employee engagement. Today, we have women on our leadership team overseeing functions that include E&S and Human Resources.

In 2025, we believe our sites continued to have a positive impact in the communities in which we operate. The following table outlines some of those impacts.

Beginning in 2025, we implemented a paid volunteer leave policy that allows employees to take up to eight hours of pay each calendar year to participate in volunteer activities with approved organizations.

Governance. We maintain and consistently reinforce within our organization a series of policies and practices designed to ensure that decisions made on behalf of our Company are properly made and executed. Our governance programs and policies start with a strong tone at the top and are summarized in our Executive Statement on Ethics and Compliance, which has been issued by our Chief Executive Officer and our Chief Compliance Officer and distributed throughout the organization.

The principles set forth in the Executive Statement are codified in our Code of Conduct, which sets forth the legal and ethical standards to which our employees must adhere, including (a) acting with integrity, (b) avoiding actual or apparent conflicts of interest,

(c) complying with the laws and regulations of federal, state, provincial, local governments, and other appropriate regulatory agencies, (d) complying with all laws and regulations prohibiting fraud, bribery, corrupt practices, anti-competitive activities and trading with embargoed persons and countries, (e) complying with all Company policies and procedures, and (f) actively promoting ethical behavior in the workplace.

Our governance programs and policies can be found on the Company’s sustainability webpages, which are routinely updated and include a description of our enterprise risk management program and our policies on child labor, human trafficking, anti-harassment, antibribery, and cybersecurity all of which are evaluated by third parties, including EcoVadis. In addition, the investors pages of our website contain additional materials regarding our corporate governance process, including our Board committee charters, our Corporate Governance Guidelines, our Code of Conduct, our Supplier Code of Conduct and other documents.

Additional Sustainability Information: Further information about our sustainability programs can be found on our website at https://www.ecovyst.com/sustainability/. The information available on our sustainability website includes our sustainability report, our sustainability goals (and how such goals map to the UN Sustainable Development Goals), materiality matrix, letters of assurance, Global Reporting Initiative (GRI) Disclosure and Sustainability Accounting Standards Board (SASB) Index, our Health Safety Environment & Security Policy Statement, our Corporate Code of Conduct, our Human Rights Policy Statement, a description of our Ethics & Compliance Complaint and Review Process and our Labor Policy. The information contained on our website is not incorporated herein by reference and is not a part of this Proxy Statement.

The following table sets forth the name, age, and position, as of March 1, 2026, of our current executive officers and significant employees.

Michael Feehan became our Vice President and Chief Financial Officer in August 2021. From May 2016 to August 2021, Mr. Feehan served as our Vice President of Finance and Treasurer, and prior to that served as our Corporate Controller beginning in 2008 after joining in 2006. Prior to joining us, Mr. Feehan served as Director of Finance and Corporate Controller for Radnor Holdings Corporation, and began his career in public accounting with Arthur Andersen and KPMG.

Joseph S. Koscinski became our Vice President, Chief Administrative Officer, General Counsel and Secretary in January 2023 after having served as Vice President, General Counsel and Secretary from November 2015 to December 2022. From August 1995 to October 2015, Mr. Koscinski was an attorney in the Business Services Group of Babst, Calland, Clements and Zomnir, P.C., a law firm in Pittsburgh, Pennsylvania, where he was named a shareholder in 2003 and where his corporate practice included mergers and acquisitions, real estate matters and commercial contracts. While in private practice, Mr. Koscinski served as our outside Corporate Counsel from 2005 to 2015.

Colleen Grace Donofrio became our Vice President—Environment and Sustainability in August 2023. Prior to joining Ecovyst, Mrs. Donofrio was a shareholder in the environmental law practice of Pittsburgh, PA.-based Babst, Calland, Clements and Zomnir, P.C., where she served as outside environmental counsel to Ecovyst and its predecessors from 2005 until August 2023.

Paul Hoelzer became our Vice President—Operations in September 2025. From October of 2022 to September of 2025, Mr. Hoelzer served as our Global Director of Health, Safety, and Process Safety Management, and prior to that served as Director of Manufacturing of our subsidiary Eco Services Operations Corp. from June 2019 to October 2022. From January 2008 to June 2019, Mr. Hoelzer held a variety of operational roles of increasing responsibility with AkzoNobel. Prior to that, Mr. Hoelzer held several operational roles at Imperial Chemical Industries and DuPont.

Kara L. Thornton became our Vice President and Chief Human Resources Officer in January 2024. She has a long successful career in human resource management. Prior to Ecovyst and from July 2019 until January 2024, Ms. Thornton served as Senior Vice President of HR at Neuronetics, a public medical device company based in Malvern, Pennsylvania. Her career also includes HR roles at Sun Pharmaceutical Industries from May 2018 until July 2019, DSM North America from August 2008 until May 2018, and Johnson & Johnson from December 2004 until August 2007. Prior to that, she held HR roles at Bayer Healthcare and Sankyo Pharma.

Mark Baunchalk became our Senior Vice President – Business Development and Strategy in February 2026. Prior to Ecovyst and from February 2017 until January 2026, he served as Head of Corporate M&A and Strategy for AkzoNobel N.V. Prior to that, he served in various business development and strategy roles at The Chemours Company and the DuPont Company.

The following table sets forth information regarding the beneficial ownership of our Common Stock as of April 13, 2026 by:

The percentage ownership information shown in the table below is based upon 109,450,306 shares of Common Stock outstanding as of April 13, 2026.

Information with respect to beneficial ownership has been furnished by each director, director nominee officer, or beneficial owner of more than 5% of our Common Stock. We have determined beneficial ownership in accordance with the rules of the SEC. These rules generally attribute beneficial ownership of shares to persons who possess sole or shared voting or investment power with respect to such shares. The information does not necessarily indicate beneficial ownership for any other purpose. Under these rules, the number of shares of Common Stock deemed outstanding includes shares issuable upon the exercise of options held by the respective person or group which may be exercised within 60 days after April 13, 2026. Such shares are deemed to be outstanding and beneficially owned by the person holding those options for the purpose of computing the percentage ownership of that person or entity, but they are not treated as outstanding for the purpose of computing the percentage ownership of any other person or entity.

Unless otherwise indicated below, the address for each listed director, director nominee officer and stockholder is c/o Ecovyst Inc., 600 Lee Road, Suite 200, Wayne, Pennsylvania 19087. The inclusion in the following table of those shares, however, does not constitute an admission that the named stockholder is a direct or indirect beneficial owner. Unless otherwise indicated and subject to applicable community property laws, to our knowledge, each stockholder named in the following table possesses sole voting and investment power over the shares listed, except for those jointly owned with that person’s spouse.

We entered into certain product sale transactions with affiliates of INEOS Limited (“INEOS”), a beneficial owner until June 30, 2025, during fiscal year 2025. We had sales of $3,183,697 to companies affiliated with INEOS during the fiscal year ended December 31, 2025. Since October 2019, our former AM&C segment and an affiliate of INEOS also were parties to a Supply and Distribution Agreement pursuant to which our former AM&C segment, on an arms-length basis, had the ability to purchase and distribute certain INEOS catalyst products. All of such transactions with the affiliates of INEOS were approved by our Nominating and Corporate Governance Committee pursuant to the policies and procedures described below.

Our Board has adopted a written policy with respect to the review, approval, and ratification of related party transactions. Under the policy, the Nominating and Corporate Governance Committee is responsible for reviewing and approving related party transactions. The policy applies to transactions, arrangements and relationships (including any indebtedness or guarantee of indebtedness) or any series of similar transactions, arrangements or relationships in which the aggregate amount involved will, or may be expected to, exceed $120,000 during the applicable period, and where we (or one of our subsidiaries) are a participant and in which a related party has or will have a direct or indirect material interest. In the course of reviewing potential related party transactions, the Nominating and Corporate Governance Committee will consider the nature of the related party’s interest in the transaction; the presence of standard prices, rates or charges or terms otherwise consistent with arms-length dealings with unrelated third parties; the materiality of the transaction to each party; the reasons for the Company entering into the transaction with the related party; the potential effect of the transaction on the status of a director as an independent, outside or disinterested director or committee member; and any other factors the Nominating and Corporate Governance Committee may deem relevant.

The Compensation Committee has reviewed and discussed the Compensation Discussion and Analysis section set forth below with our management. Based on this review and discussion, the Compensation Committee recommended to our Board that the Compensation Discussion and Analysis section be included in this Proxy Statement, which will be incorporated by reference in our Annual Report on Form 10-K for the fiscal year ended December 31, 2025.

Respectfully submitted by the Compensation Committee of our Board

David A. Bradley, Chair

Anna C. Catalano

Kevin M. Fogarty

This section discusses the principles underlying the material components of our executive compensation program for our executive officers who are named in the Summary Compensation Table and the factors relevant to an analysis of our executive compensation policies and decisions. For the year ended December 31, 2025, our named executive officers (“NEOs”) were as follows.