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    SEC Form 11-K filed by Ecovyst Inc.

    6/20/25 4:00:26 PM ET
    $ECVT
    Major Chemicals
    Industrials
    Get the next $ECVT alert in real time by email
    11-K 1 form11-kxsavingplanfinanci.htm 11-K Document


    UNITED STATES
    SECURITIES AND EXCHANGE COMMISSION
    Washington, D.C. 20549
    FORM 11-K
    (Mark One)
    ☒ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
    For the fiscal year ended December 31, 2024
    OR
    ¨
    TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

    For the transition period from                      to                     

    Commission File Number: 001-38221


    Ecovyst 401(k) Savings Plan (Amended and Restated Effective January 1, 2024)
    (Full title of plan)
    Ecovyst Inc.
    600 Lee Road, Suite 200
    Wayne, Pennsylvania, 19087
    (Name of issuer of the securities held pursuant to the plan and address of its principal executive office)

























    Table of contents
    ECOVYST 401(K) SAVINGS PLAN

    Form 11-K
    For the fiscal years ended December 31, 2024 and 2023
    Table of Contents
    Page
    Report of Independent Registered Public Accounting Firm
    3
    Statements of Net Assets Available for Benefits
    4
    Statements of Changes in Net Assets Available for Benefits
    5
    Notes to the Financial Statements
    6
    Supplemental Schedule - Schedule H, Line 4i - Schedule of Assets (Held at End of Year)
    11
    Signature
    12
    Exhibits
    13

    2

    Table of contents
    Report of Independent Registered Public Accounting Firm

    To the Participants and Benefit Plans Committee of
    the Ecovyst 401(k) Savings Plan
    Wayne, Pennsylvania

    Opinion on the Financial Statements
    We have audited the accompanying statements of net assets available for benefits of the Ecovyst 401(k) Savings Plan (the “Plan”) as of December 31, 2024 and 2023, the related statements of changes in net assets available for benefits for the years then ended, and the related notes (collectively, the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 2024 and 2023, and the changes in net assets available for benefits for the years then ended, in conformity with accounting principles generally accepted in the United States of America.
    Basis for Opinion
    These financial statements are the responsibility of the Plan’s management. Our responsibility is to express an opinion on the Plan’s financial statements based on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (PCAOB) and are required to be independent with respect to the Plan in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
    We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. The Plan is not required to have, nor were we engaged to perform, an audit of its internal control over financial reporting. As part of our audits we are required to obtain an understanding of internal control over financial reporting but not for the purpose of expressing an opinion on the effectiveness of the Plan’s internal control over financial reporting. Accordingly, we express no such opinion.
    Our audits included performing procedures to assess the risk of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by the Plan’s management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
    Supplemental Information
    The supplemental information in the accompanying schedule, Schedule H, Line 4i - Schedule of Assets (Held at End of Year) as of December 31, 2024, has been subjected to audit procedures performed in conjunction with the audit of the Plan’s financial statements. The supplemental information is presented for the purpose of additional analysis and is not a required part of the financial statements but included supplemental information required by the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. The supplemental information is the responsibility of the Plan’s management. Our audit procedures included determining whether the supplemental information reconciles to the financial statements or the underlying accounting and other records, as applicable, and performing procedures to test the completeness and accuracy of the information presented in the supplemental information. In forming our opinion on the supplemental information, we evaluated whether the supplemental information, including its form and content, is presented in conformity with the Department of Labor’s Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. In our opinion, the supplemental information is fairly stated, in all material respects, in relation to the financial statements as a whole.

    /s/ Urish Popeck & Co., LLC
    We have served as the Plan’s auditor since 2005.
    State College, Pennsylvania
    June 20, 2025

    3

    Table of contents
    FINANCIAL STATEMENTS

    ECOVYST 401(K) SAVINGS PLAN
    STATEMENTS OF NET ASSETS AVAILABLE FOR BENEFITS


    December 31,
    20242023
    Assets
    Investments, at fair value$250,951,897 $230,553,494 
    Receivables:
    Employer contributions4,751,431 4,806,575 
    Participant notes receivable2,855,791 2,721,570 
    Total receivables7,607,222 7,528,145 
    Net assets available for benefits$258,559,119 $238,081,639 

    The accompanying notes are an integral part of these financial statements.


    4

    Table of contents
    ECOVYST 401(K) SAVINGS PLAN
    STATEMENTS OF CHANGES IN NET ASSETS AVAILABLE FOR BENEFITS


    Years ended December 31,
    20242023
    Additions
    Investment income:
    Dividends$11,577,486 $8,243,341 
    Contributions:
    Employer6,482,340 6,353,251 
    Participants7,561,554 7,096,842 
    Rollovers1,890,605 726,198 
    Total contributions15,934,499 14,176,291 
    Interest income on participant notes receivable219,903 163,880 
    Total additions27,731,888 22,583,512 
    Deductions
    Benefits paid to participants25,432,398 21,625,359 
    Administrative expenses116,660 98,909 
    Total deductions25,549,058 21,724,268 
    Net appreciation in fair value of investments18,294,650 27,620,134 
    Net increase in net assets available for benefits20,477,480 28,479,378 
    Net assets available for benefits, beginning of year238,081,639 209,602,261 
    Net assets available for benefits, end of year$258,559,119 $238,081,639 

    The accompanying notes are an integral part of these financial statements.

    5

    Table of contents

    ECOVYST 401(K) SAVINGS PLAN
    NOTES TO THE FINANCIAL STATEMENTS


    1. Description of Plan:
    The following description of the Ecovyst 401(k) Savings Plan (the “Plan”) provides only general information. Participants should refer to the plan document or summary plan description for a more complete description of the Plan’s provisions.
    General
    The Plan is a defined contribution plan covering substantially all U.S. employees of Ecovyst Catalyst Technologies, LLC (the “Company”) and its participating affiliates. The Plan provides for a cash-deferred option and is qualified under Section 401(k) of the Internal Revenue Code (“IRC”). It is subject to the provisions of the Employee Retirement Income Security Act of 1974 (“ERISA”). The Plan is interpreted, administered and operated by an administrative committee (the “Benefit Plans Committee”) comprised entirely of executives of the Company.
    The plan document provides for a Company investment program as a component of the Plan, which allows for the establishment of a parent company stock account through which participants may elect to invest in common shares of Ecovyst Inc., the parent of the Company (the “Parent Company”). A participant’s investment in the Ecovyst Stock Fund (the “Parent Company’s common stock”) is limited to 15% of the participant’s total account value.
    Plan Amendments and Changes
    Effective January 1, 2024, the Company added a Roth after-tax contribution and a Roth in-plan conversion feature to the Plan. The Roth after-tax contribution allows participants to contribute money after taxes to the plan today, which can be withdrawn tax-free at retirement provided certain requirements are met. Roth after-tax contributions are matched the same as pre-tax deferral contributions. The Roth in-plan conversion feature allows participants to turn pre-tax and traditional after-tax money into Roth savings, which can be withdrawn tax-free at retirement provided certain requirements are met.
    As a result of this amendment, the Plan increased the combined pre-tax and Roth contribution limit that highly compensated employees may elect from 15% to 20% of their basic earnings.
    Contributions
    The Plan provides for employee discretionary salary reduction (pre-tax) contributions. Non-highly compensated participating employees may elect to contribute up to 50% of their basic earnings to the Plan and highly compensated employees may elect to contribute up to 20% of their basic earnings (“basic contributions”). The Company will make matching contributions of 50% of the first 6% of an employee’s elective deferrals of their basic earnings. Due to limitations imposed by the IRC, the aggregate amount of compensation deferral pre-tax contributions with respect to any participant could not exceed $23,000 and $22,500 for the years ended December 31, 2024 and 2023, respectively. In addition, participants who attained age 50 by the end of the respective plan year were eligible to make additional catch up contributions of $7,500 for the years ended December 31, 2024 and 2023. Employees may also elect to make additional after-tax contributions (“voluntary contributions”), the maximum aggregate amount of which may not exceed 10% of the employee’s basic earnings for the calendar year. Participants may also roll-over amounts representing distributions from other qualified defined contribution plans.
    The Company makes annual contributions (“Annual Contributions”) ranging from 4% to 8% of eligible compensation for the plan year depending on certain factors such as age and years of service. Amounts totaling $4,602,923 and $4,632,498 were contributed as Annual Contributions for the years ended December 31, 2024 and 2023, respectively, which are included (along with Company matching contributions) in employer contributions in the Statements of Changes in Net Assets Available for Benefits.
    Investment Options
    Contributions to the Plan are invested, at the direction of the participants in accordance with ERISA Sec. 404(c), in a series of mutual funds or the Parent Company’s common stock. The Plan currently offers mutual funds or shares of the Parent Company’s common stock as investment options for participants through the Plan’s trustee, Vanguard Fiduciary Trust Company (“VFTC”). Participants determine the amount to be invested and may make changes in their investment elections at any time.
    Participant Accounts
    Each participant’s account is credited with the participant’s contributions, Company contributions and Plan earnings (gains and losses). Participant accounts are charged directly for the expenses associated with the administration of their participant notes, as applicable (see Note 6). Administrative or recordkeeping fees are offset by applicable credits, if any, built into fund expense ratios. Any increase or decrease in the value of the funds and all income is credited to (or losses deducted from) the participants’ accounts in direct proportion to the respective amount in each account. The benefit to which participants are entitled is the benefit that can be provided from the participants’ vested account.
    6

    Table of contents

    ECOVYST 401(K) SAVINGS PLAN
    NOTES TO THE FINANCIAL STATEMENTS

    Vesting and Eligibility
    All participants are fully vested in their basic, voluntary and rollover contributions plus earnings thereon. Participants vest in their matching contribution account at the rate of 33-1/3% per year and become fully vested after three years of service with the Company. Employees are eligible for Plan participation on any entry date (first day of the first pay period of any calendar month) upon completion of one or more hours of service. Participants are not vested in their Annual Contributions until the completion of three years of service, at which time they become 100% vested. Notwithstanding the above, all participants become 100% vested in all accounts upon normal retirement, death while an active employee (including while serving during qualified military leave) or total disability.
    Forfeited Accounts
    Non-vested Company contributions are forfeited under Plan rules and serve to offset the Company’s future contributions. The Company used $309,850 and $205,608 in forfeitures to offset contributions during the years ended December 31, 2024 and 2023, respectively. The amount of unused forfeitures in the Plan totaled $186,046 and $265,208 at December 31, 2024 and 2023, respectively.
    Payment of Benefits and Withdrawals
    Upon termination of service due to death, disability, retirement or other reasons, any participant may elect to immediately receive a lump sum distribution or installment payments, or combination of both, equal to the vested interest of his or her account. If a participant is not fully vested in the Company matching contribution portion of his or her account on the date of termination of employment, the non-vested portion is forfeited. Upon attainment of age 59 1/2, participants may withdraw, not more than once per plan year, amounts from their rollover and basic contribution accounts. In addition, participants who have made voluntary after-tax or Roth contributions may make withdrawals from these accounts at any time, but are limited to two withdrawals during any plan year (subject to Internal Revenue Service penalties). The Plan allows participants to make hardship withdrawals of basic contributions subject to income taxation and Internal Revenue Service penalties from some or all of their vested account balances. The Plan’s management implemented the provisions of the CARES Act to allow certain affected participants to take a special COVID-19 related distribution of up to $100,000 from qualified plans through December 31, 2020, which must be repaid within three years of the date of distribution in order for the participant to claim a refund for the income taxes paid on the distribution. Also, during the year ended December 31, 2020, the maximum age for required minimum distributions was increased to age 72 (from age 70 1/2). The SECURE 2.0 Act of 2022 increased the age to 73, beginning in 2023.
    Participant Notes Receivable
    Eligible participants may also borrow from their accounts. The minimum that may be borrowed is $1,000. The maximum that may be borrowed is the lesser of $50,000, as adjusted, or 50% of a participant’s vested account balance. The notes are secured by the balance in the participant’s account. Principal and interest is paid ratably through monthly payroll deductions over five years or less (15 years if the note is for the purchase of a primary residence) with interest at rates that range from 4.25% to 9.50% as of December 31, 2024 and 2023, which are commensurate with prevailing rates at the time the loans are initiated. Participants must pay a note origination fee as well as an annual note maintenance fee for each note. Participant notes are valued at their outstanding balances, which approximates fair value.
    Plan Termination
    Although it has not expressed any intent to do so, the Company has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event of a Plan termination, affected participants will become 100% vested in their accounts.
    7

    Table of contents

    ECOVYST 401(K) SAVINGS PLAN
    NOTES TO THE FINANCIAL STATEMENTS

    2. Summary of Significant Accounting Policies:
    Basis of Accounting
    The accompanying financial statements of the Plan are prepared on the accrual basis of accounting generally accepted in the United States of America.
    Investment Valuation and Income Recognition
    The investments of the Plan are stated at fair value. An asset’s fair value is defined as the price at which the asset could be exchanged in a current transaction between market participants. A liability’s fair value is defined as the amount that would be paid to transfer the liability to a market participant, not the amount that would be paid to settle the liability with the creditor. See Note 3 to these financial statements regarding the application of fair value measurements.
    Purchases and sales of investments are recorded on a trade-date basis. Interest income is recorded as earned on an accrual basis. Dividends are recorded on the ex-dividend date. The Plan presents in the Statements of Changes in Net Assets Available for Benefits the net appreciation (depreciation) in fair value of investments which consists of realized gains or losses and unrealized appreciation or depreciation on those investments.
    Payment of Benefits
    Benefits are recorded when paid.
    Participant Notes Receivable
    Participant loans are classified as participant notes receivable on the Statements of Net Assets Available for Benefits and represent participant loans that are recorded at their unpaid principal balance plus accrued but unpaid interest. Interest income on notes receivable from participants is recorded when it is earned. Related fees are recorded as administrative expenses and are expensed when they are incurred. No allowance for credit losses was recorded as of December 31, 2024 and 2023. If a participant ceases to make loan repayments and the plan administrator deems the participant loan to be a distribution, the participant loan balance is reduced and a benefit payment is recorded based upon the terms of the plan document.
    Use of Estimates
    The preparation of financial statements in accordance with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and changes therein, and disclosure of contingent assets and liabilities. Actual results could differ from those estimates and these differences could be material.
    Risks and Uncertainties
    The Plan invests in various mutual fund investments and the Parent Company’s common stock. Investment securities, in general, are exposed to various risks, such as interest rate, market volatility and credit risks. Due to the level of risk associated with certain investment securities and the level of uncertainty related to changes in the values of investment securities, it is at least reasonably possible that changes in the values of investment securities will occur in the near term and that such changes could materially affect participants’ account balances and the amounts reported in the Statements of Net Assets Available for Benefits.
    3. Fair Value Measurements:
    Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures (“ASC 820”), establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest ranking to fair values determined using unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest ranking to fair values determined using methodologies and models with unobservable inputs (Level 3). The classification of an asset or a liability is based on the lowest level input that is significant to its measurement. For example, a Level 3 fair value measurement may include inputs that are both observable (Levels 1 and 2) and unobservable (Level 3). The levels of the fair value hierarchy under ASC 820 are described below:
    Level 1—Values are unadjusted quoted prices for identical assets and liabilities in active markets accessible at the measurement date. Active markets provide pricing data for trades occurring at least weekly and include exchanges and dealer markets.
    Level 2— Inputs include quoted prices of similar assets or liabilities in active markets, quoted prices from those willing to trade in markets that are not active, or other inputs that are observable or can be corroborated by market data for the term of the instrument. Such inputs include market interest rates and volatilities, spreads and yield curves.
    8

    Table of contents

    ECOVYST 401(K) SAVINGS PLAN
    NOTES TO THE FINANCIAL STATEMENTS

    Level 3—Certain inputs are unobservable (supported by little or no market activity) and significant to the fair value measurement. Unobservable inputs reflect the Company’s best estimate of what hypothetical market participants would use to determine a transaction price for the asset or liability at the reporting date.
    Valuation methodologies maximize the use of relevant observable inputs and minimize the use of unobservable inputs. The following is a description of the valuation methodologies used for the Plan’s investment assets measured at fair value. There have been no changes in the valuation methodologies used at December 31, 2024 and 2023.
    Mutual funds represent investments with various investment managers. The fair value of these investments is determined by reference to the fund’s underlying assets, which are principally marketable equity and fixed income securities. All of the Plan’s mutual fund investments are traded on national securities exchanges and are valued at their respective net asset values as of December 31, 2024 and 2023.
    The Plan has an investment in the common shares of the Parent Company, which is listed on the New York Stock Exchange (“NYSE”) under the ticker symbol “ECVT”. The investment in Parent Company common stock is valued based on the number of shares held by the Plan at year-end multiplied by the closing price of the Parent Company’s common stock on the NYSE as of December 31, 2024 and 2023.
    The following tables set forth by level within the fair value hierarchy the Plan investment assets at fair value, as of December 31, 2024 and 2023. As required by ASC 820, assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Plan had no financial liabilities as of December 31, 2024 and 2023.
    Investment Assets at Fair Value as of December 31, 2024
    Level 1Level 2Level 3Total
    Mutual funds$250,708,035 $— $— $250,708,035 
    Parent Company common stock243,862 — — 243,862 
    Total investments at fair value$250,951,897 $— $— $250,951,897 
    Investment Assets at Fair Value as of December 31, 2023
    Level 1Level 2Level 3Total
    Mutual funds$230,328,484 $— $— $230,328,484 
    Parent Company common stock225,010 — — 225,010 
    Total investments at fair value$230,553,494 $— $— $230,553,494 

    The Plan’s investment in the Vanguard PRIMECAP Fund Admiral Shares totaled $29,237,039 and $27,286,423 as of December 31, 2024 and 2023, respectively, and Vanguard Institutional Index Fund Institutional Shares totaled $28,973,386 and $24,116,908 as of December 31, 2024 and 2023, respectively. Each investment represents a concentration equal to or greater than 10% of the Plan’s net assets available for benefits.
    4. Tax Status:
    The Internal Revenue Service has determined and informed the Company by a determination letter dated September 22, 2017 that the Plan and related trust are designed in accordance with applicable sections of the IRC. The Plan has been amended and restated since receiving the determination letter. However, the Company and the Benefit Plans Committee believe the Plan is designed and currently being operated in compliance with the applicable requirements of the IRC.
    Generally accepted accounting principles require plan management to evaluate tax positions taken by the Plan and recognize a tax liability (or asset) if the Plan has taken an uncertain position that more likely than not would not be sustained upon examination by the relevant taxing authority. The tax positions taken include the Plan status as a qualified plan. The Benefit Plans Committee believes that the Plan is operating in a manner that does not jeopardize its tax status. Therefore, no provision for income taxes has been included in the Plan’s financial statements.
    The Plan is subject to routine audits by taxing jurisdictions; however, there are currently no audits for any tax periods in progress. The Benefit Plans Committee believes the Plan is no longer subject to income tax examinations for years prior to 2021.
    9

    Table of contents

    ECOVYST 401(K) SAVINGS PLAN
    NOTES TO THE FINANCIAL STATEMENTS

    5. Terminated Participants:
    When participants terminate employment with the Company or a participating affiliate, they may choose to leave their investments in the Plan, as long as their vested balance is greater than $5,000. Terminated participants’ accounts totaled $105,133,902 and $101,463,593 as of December 31, 2024 and 2023, respectively.
    6. Administrative Expenses:
    Overall administrative expenses can be settled and reduced using any revenue credits built into fund expense ratios (see Note 7). Although not obligated to do so, the Company has historically paid any net recordkeeping expenses of the Plan. Amounts reported as administrative expenses in the Statements of Changes in Net Assets Available for Benefits represent fees paid by participants for requested services. Participants’ accounts are charged directly for these fees.
    7. Related Party Transactions:
    Certain Plan investments are shares of mutual funds managed by VFTC. VFTC is the trustee as defined by the Plan and therefore, these transactions qualify as party-in-interest transactions. The Plan holds shares of common stock in the Parent Company, representing qualifying employer securities as defined by ERISA. The Plan held qualifying employer securities valued at $243,862 and $225,010 at December 31, 2024 and 2023, respectively.
    Notes to participants also qualify as party-in-interest transactions. Participant notes receivable were $2,855,791 and $2,721,570 as of December 31, 2024 and 2023, respectively. Fees paid to VFTC by Plan participants for note administration are reflected within administrative expenses in the Statements of Changes in Net Assets Available for Benefits. Including investment advisory fees paid by Plan participants, administrative expenses totaled $116,660 and $98,909 for the years ended December 31, 2024 and 2023, respectively.
    Several of the mutual funds managed by VFTC and included under the Plan offer revenue credits as part of what is built into their expense ratio. These revenue credits are used to offset and reduce the administrative and recordkeeping fees of the Plan.
    8. Subsequent Events:
    The Company has evaluated subsequent events since the date of the financial statements and determined that there are no items to disclose.
    10

    Table of contents
    SUPPLEMENTAL SCHEDULE


    ECOVYST 401(K) SAVINGS PLAN
    Schedule H, Line 4i - Schedule of Assets (Held at End of Year)

    EIN 86-2551862, Plan Number 003
    December 31, 2024
    (a)(b) Identity of issue, borrower, lessor, or similar party(c) Description of investment including maturity date, rate of interest, collateral, par, or maturity value(d) Cost(e) Current
    Value
    *The Vanguard GroupVanguard PRIMECAP Fund Admiral Sharesa$29,237,039 
    *The Vanguard GroupVanguard Institutional Index Fund Inst'l Sharesa28,973,386 
    *The Vanguard GroupVanguard Target Retirement 2025 Funda16,038,313 
    *The Vanguard GroupVanguard Target Retirement 2030 Funda13,950,518 
    *The Vanguard GroupVanguard Total Stock Market Index Fund: Inst'l Shra13,320,302 
    *The Vanguard GroupVanguard Total Bond Market Index Fund: Inst'l Shra13,251,638 
    *The Vanguard GroupVanguard Target Retirement 2035 Funda12,988,941 
    *The Vanguard GroupVanguard Cash Reserves Federal MM Fund Admiral Sharesa11,777,546 
    *The Vanguard GroupVanguard Target Retirement 2040 Funda10,029,089 
    *The Vanguard GroupVanguard Windsor II Fund Admiral Sharesa9,916,590 
    *The Vanguard GroupVanguard Wellington Fund Admiral Sharesa9,837,587 
    *The Vanguard GroupVanguard Total International Stock Index Fund: Inst'l Shra8,774,434 
    *The Vanguard GroupVanguard Target Retirement 2020 Funda8,476,448 
    *The Vanguard GroupVanguard Target Retirement 2045 Funda8,474,353 
    *The Vanguard GroupVanguard U.S. Growth Fund Investor Sharesa8,412,079 
    *The Vanguard GroupVanguard Target Retirement Incomea7,286,614 
    *The Vanguard GroupVanguard Target Retirement 2050 Funda7,076,296 
    *The Vanguard GroupVanguard Mid-Cap Index Fund Investor Sharesa6,136,634 
    *The Vanguard GroupVanguard Target Retirement 2055 Funda5,230,996 
    *The Vanguard GroupVanguard Small-Cap Index Fund Investor Sharesa4,656,785 
    *The Vanguard GroupVanguard Explorer Fund Investor Sharesa3,784,735 
    *The Vanguard GroupVanguard International Growth Fund Investor Sharesa3,667,337 
    *The Vanguard GroupVanguard Wellesley Income Fund Investor Sharesa3,656,395 
    *The Vanguard GroupVanguard Target Retirement 2060 Funda2,155,131 
    PIMCOPIMCO Total Return Fund, Administrative Classa1,602,555 
    Fidelity InvestmentsFidelity Value Fund; Retail Classa1,524,787 
    *The Vanguard GroupVanguard Target Retirement 2065 Funda455,652 
    *Ecovyst Inc.Ecovyst Stock Funda243,862 
    *The Vanguard GroupVanguard Target Retirement 2070 Funda15,855 
    *Notes receivable from participantsInterest rates from 4.25% to 9.50%—2,855,791 
    Total$253,807,688 
    * - Indicates a party-in-interest to the Plan
    a - The cost of participant directed investments is not required to be disclosed

    See the accompanying Report of Independent Registered Public Accounting Firm.
    11

    Table of contents
    SIGNATURE
    The Plan. Pursuant to the requirements of the Securities Exchange Act of 1934, the trustees (or other persons who administer the employee benefit plan) have duly caused this annual report to be signed on its behalf by the undersigned hereunto duly authorized.

    Ecovyst 401(K) Savings Plan
    Date:June 20, 2025By:/s/ Susan Olafson
    Susan Olafson
    Director, Total Rewards
    (on behalf of the Plan Administrator)

    12

    Table of contents
    EXHIBITS
    The following exhibits are being filed as part of this Form 11-K:
    Exhibit No.Description
    23.1
    Consent of Independent Registered Public Accounting Firm

    13
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      8/6/24 4:01:29 PM ET
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    • Officer Feehan Michael bought $100,542 worth of shares (16,000 units at $6.28), increasing direct ownership by 5% to 364,799 units (SEC Form 4)

      4 - Ecovyst Inc. (0001708035) (Issuer)

      8/6/24 4:01:10 PM ET
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    • Ecovyst Issues 2024 Sustainability Report

      WAYNE, Pa., June 30, 2025 /PRNewswire/ -- Ecovyst Inc. (NYSE:ECVT), a leading integrated and innovative global provider of advanced materials, specialty catalysts, virgin sulfuric acid and sulfuric acid regeneration services ("Ecovyst"), today announced the release of its 2024 Sustainability Report, "Building Momentum Towards a More Sustainable Future." This report features 2024 data, including HSES, greenhouse gas emissions, energy, water, and waste results. It also highlights the incremental progress the company has made toward achieving its sustainability goals. "In 2024 we

      6/30/25 5:30:00 PM ET
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    • Ecovyst Completes Acquisition of Waggaman, Louisiana, Sulfuric Acid Assets from Cornerstone Chemical

      WAYNE, Pa., May 6, 2025 /PRNewswire/ -- Ecovyst Inc. (NYSE:ECVT), a leading integrated and innovative global provider of advanced materials, specialty catalysts, virgin sulfuric acid and sulfuric acid regeneration services ("Ecovyst"), announced today that Eco Services Operations Corp., a wholly-owned subsidiary of Ecovyst, has completed its acquisition of the Waggaman, Louisiana sulfuric acid production assets of Cornerstone Chemical Company. "We are excited to welcome the Waggaman team to Ecovyst and we look forward to working with our new colleagues as we integrate the Corn

      5/6/25 4:45:00 PM ET
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    • Ecovyst Reports First Quarter 2025 Results and Reaffirms 2025 Guidance for Adjusted EBITDA

      WAYNE, Pa., May 1, 2025 /PRNewswire/ -- Ecovyst Inc. (NYSE:ECVT) ("Ecovyst" or the "Company"), a leading integrated and innovative global provider of advanced materials, specialty catalysts, virgin sulfuric acid and sulfuric acid regeneration services, today reported results for the first quarter ended March 31, 2025. First Quarter 2025 Results & Highlights Sales of $162.2 million, compared to $160.5 million in the first quarter of 2024Net Loss of $3.6 million, compared to Net Income of $1.2 million in the year-ago quarter, with a net loss margin of 2.2% and diluted net loss p

      5/1/25 6:00:00 AM ET
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    • Citigroup initiated coverage on Ecovyst with a new price target

      Citigroup initiated coverage of Ecovyst with a rating of Buy and set a new price target of $12.00

      9/11/23 7:19:57 AM ET
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    • BWS Financial initiated coverage on Ecovyst with a new price target

      BWS Financial initiated coverage of Ecovyst with a rating of Buy and set a new price target of $18.00

      3/23/22 9:07:43 AM ET
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    • Deutsche Bank reiterated coverage on Ecovyst with a new price target

      Deutsche Bank reiterated coverage of Ecovyst with a rating of Buy and set a new price target of $13.00 from $16.00 previously

      3/2/22 9:23:16 AM ET
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    • Director Bradley David A. was granted 25,674 shares, increasing direct ownership by 41% to 88,600 units (SEC Form 4)

      4 - Ecovyst Inc. (0001708035) (Issuer)

      2/5/25 4:11:06 PM ET
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    • Officer Vann George L. Jr. was granted 20,540 shares, increasing direct ownership by 42% to 69,679 units (SEC Form 4)

      4 - Ecovyst Inc. (0001708035) (Issuer)

      2/5/25 4:10:52 PM ET
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    • Officer Bitting Kurt was granted 154,044 shares, increasing direct ownership by 34% to 602,001 units (SEC Form 4)

      4 - Ecovyst Inc. (0001708035) (Issuer)

      2/5/25 4:10:40 PM ET
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    SEC Filings

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    • SEC Form 11-K filed by Ecovyst Inc.

      11-K - Ecovyst Inc. (0001708035) (Filer)

      6/20/25 4:00:26 PM ET
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    • SEC Form SD filed by Ecovyst Inc.

      SD - Ecovyst Inc. (0001708035) (Filer)

      5/30/25 4:02:58 PM ET
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    • Ecovyst Inc. filed SEC Form 8-K: Submission of Matters to a Vote of Security Holders

      8-K - Ecovyst Inc. (0001708035) (Filer)

      5/9/25 4:01:57 PM ET
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    • Glatfelter Announces Key Leadership Appointments in Connection With Proposed Merger With Berry's Health, Hygiene, and Specialties Global Nonwovens and Films Business

      ~ Kevin M. Fogarty to serve as Non-Executive Chair of the Board of Directors for the proposed newly combined company ~ James M. Till to serve as Executive Vice President, Chief Financial Officer & Treasurer ~ Tarun Manroa to serve as Executive Vice President, Chief Operating Officer CHARLOTTE, N.C., April 11, 2024 (GLOBE NEWSWIRE) -- Glatfelter Corporation (NYSE:GLT), a leading global supplier of engineered materials, in anticipation of the previously announced proposed merger of the majority of Berry Global's Health, Hygiene, and Specialties segment to include its Global Nonwovens and Films ("HHNF") business with Glatfelter, is pleased to announce today key leadership appointments, in

      4/11/24 6:50:00 AM ET
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    • Ecovyst Appoints Colleen Grace Donofrio as Vice President – Environment and Sustainability

      Ecovyst Inc. (NYSE:ECVT) ("Ecovyst" or the "Company"), a leading integrated and innovative global provider of specialty catalysts and services, today announced that Colleen Grace Donofrio has been appointed as its Vice President – Environment and Sustainability. "I am excited to have Colleen join the team to lead our environmental and sustainability programs," said Kurt Bitting, Chief Executive Officer of Ecovyst. "Colleen's experience and enthusiasm will help further enhance Ecovyst's award winning sustainability programs and bolster our efforts to develop service offerings that enable our customers to meet their sustainability goals. Mrs. Donofrio most recently served as a shareholder

      8/21/23 6:30:00 AM ET
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    • Ecovyst Inc. Appoints Gene Shiels to Lead Investor Relations

      Ecovyst Inc. (NYSE:ECVT) ("Ecovyst"), a leading integrated and innovative global provider of specialty catalysts and services, today announced that it has appointed Gene Shiels as Director of Investor Relations. Mr. Shiels will report to Mike Feehan, Chief Financial Officer of Ecovyst. Mr. Shiels has more than 18 years of experience in Investor Relations. Most recently, he served as Director of Investor Relations at Kraton Corporation, a position he held from 2010 until the company's sale in March of 2022. Prior to that role, he held positions of increasing responsibility at Baker Hughes Incorporated, including Assistant Director of Investor Relations and Assistant Treasurer. Mr. Shiels ho

      5/2/22 6:59:00 AM ET
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    • Ecovyst Reports First Quarter 2025 Results and Reaffirms 2025 Guidance for Adjusted EBITDA

      WAYNE, Pa., May 1, 2025 /PRNewswire/ -- Ecovyst Inc. (NYSE:ECVT) ("Ecovyst" or the "Company"), a leading integrated and innovative global provider of advanced materials, specialty catalysts, virgin sulfuric acid and sulfuric acid regeneration services, today reported results for the first quarter ended March 31, 2025. First Quarter 2025 Results & Highlights Sales of $162.2 million, compared to $160.5 million in the first quarter of 2024Net Loss of $3.6 million, compared to Net Income of $1.2 million in the year-ago quarter, with a net loss margin of 2.2% and diluted net loss p

      5/1/25 6:00:00 AM ET
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    • Ecovyst to Host First Quarter 2025 Earnings Conference Call and Webcast on Thursday, May 1, 2025 at 11:00 a.m. ET

      WAYNE, Pa., April 9, 2025 /PRNewswire/ -- Ecovyst Inc. (NYSE:ECVT), a leading integrated and innovative global provider of advanced materials, specialty catalysts and services, announced today that it will conduct a conference call and audio-only webcast on Thursday, May 1, 2025 at 11:00 a.m. Eastern Time to review its first quarter 2025 financial results. Investors may listen to the conference call live via telephone by dialing 1 (800) 225-9448 (domestic) or 1 (203) 518-9708 (international) and use the participant code ECVTQ125. An audio-only live webcast of the conference ca

      4/9/25 5:30:00 PM ET
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    • Ecovyst Reports Fourth Quarter and Full Year 2024 Results

      MALVERN, Pa., Feb. 27, 2025 /PRNewswire/ -- Ecovyst Inc. (NYSE:ECVT) ("Ecovyst" or the "Company"), a leading integrated and innovative global provider of advanced materials, specialty catalysts and services, today reported results for the fourth quarter and full year ended December 31, 2024. Full Year 2024 Results & Highlights Sales of $704.5 million, compared to $691.1 million in 2023Net loss of $6.7 million. Net loss margin of 1.0%, with diluted net loss per share of $0.06Adjusted net income of $68.6 million, with Adjusted diluted income per share of $0.58Adjusted EBITDA of

      2/27/25 6:00:00 AM ET
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    • Amendment: SEC Form SC 13G/A filed by Ecovyst Inc.

      SC 13G/A - Ecovyst Inc. (0001708035) (Subject)

      9/10/24 3:20:20 PM ET
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    • SEC Form SC 13G/A filed by Ecovyst Inc. (Amendment)

      SC 13G/A - Ecovyst Inc. (0001708035) (Subject)

      2/13/24 5:04:42 PM ET
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    • SEC Form SC 13G filed by Ecovyst Inc.

      SC 13G - Ecovyst Inc. (0001708035) (Subject)

      2/13/24 4:04:48 PM ET
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