As of November 8, 2026, 6 holders' latest Schedule 13D or 13G filings report owning 5% or more of Ecovyst Inc. The largest reported stake is Rubric Capital Management LP's, at 9.09%. 11 filings are on record since July 2, 2025 (Schedule 13G, November 14, 2025).
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Key facts
- · Reporting person: Fmr LLC · Sole voting: 8,444,236 · Shared voting: 0 · Sole dispositive: 8,475,538 · Shared dispositive: 0 · SCHEDULE 13G, 2026-11-05
- · Reporting person: Vanguard Portfolio Management · Sole voting: 101,006 · Shared voting: 0 · Sole dispositive: 6,191,928 · Shared dispositive: 0 · SCHEDULE 13G, 2026-07-31
- · Reporting person: Dimensional Fund Advisors LP · Sole voting: 6,484,301 · Shared voting: 0 · Sole dispositive: 6,585,047 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-07-14
- · Holder: Hotchkis and Wiley Capital Management, LLC · Percent: 4.9% · SCHEDULE 13G/A
- · Holder: Vanguard Capital Management · Percent: 5.25% · SCHEDULE 13G
Ecovyst Inc has 11 Schedule 13D or 13G filings on record since 2025-07-02. 6 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Rubric Capital Management LP | 9.09% | 10,400,000 | SCHEDULE 13G, 2025-11-14 | 2025-09-30 |
| BlackRock, Inc. | 7.7% | 8,526,153 | SCHEDULE 13G/A, 2026-04-24 | 2026-03-31 |
| Fmr LLC | 7.7% | 8,475,538 | SCHEDULE 13G, 2026-11-05 | 2026-09-30 |
| Dimensional Fund Advisors LP | 6% | 6,585,047 | SCHEDULE 13G/A, 2026-07-14 | 2026-06-30 |
| Vanguard Portfolio Management | 5.65% | 6,191,928 | SCHEDULE 13G, 2026-07-31 | 2026-06-30 |
| Vanguard Capital Management | 5.25% | 5,814,039 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Hotchkis and Wiley Capital Management, LLC | 4.9% | 5,413,862 | SCHEDULE 13G/A, 2026-05-08 | 2026-03-31 |
| INEOS Limited | 0% | 0 | SCHEDULE 13D/A, 2025-07-02 | 2025-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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More on Ecovyst Inc and the records around it.
Ecovyst Inc elsewhere on the record
- Leadership changes Aug 2026
- Who owns it
Companies that share a holder
- Hotchkis and Wiley Capital Management, LLC also filed stake reports on 13 other companies: Global Indemnity Group, LLC (Aug 2026), National CineMedia, Inc. (Aug 2026), Stagwell Inc (Nov 2025)
- Rubric Capital Management LP also filed stake reports on 32 other companies: ARDELYX, INC. (Aug 2026), Enovis Corporation (Aug 2026), MeiraGTx Holdings plc (Aug 2026)
- Dimensional Fund Advisors LP also filed stake reports on 366 other companies: Acadia Healthcare Co Inc (Oct 2026), ADT Inc (Oct 2026), AGCO Corp (Oct 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Fmr LLC | 8,444,236 | 0 | 8,475,538 | 0 | SCHEDULE 13G, 2026-11-05 |
| Abigail P. Johnson | 0 | 0 | 8,475,538 | 0 | SCHEDULE 13G, 2026-11-05 |
| Dimensional Fund Advisors LP | 6,484,301 | 0 | 6,585,047 | 0 | SCHEDULE 13G/A, 2026-07-14 |
| Vanguard Portfolio Management | 101,006 | 0 | 6,191,928 | 0 | SCHEDULE 13G, 2026-07-31 |
The latest filing identifies Ecovyst Inc by CUSIP 27923Q109 and gives its principal executive office as 600 LEE ROAD, SUITE 200, WAYNE, PA 19087 (SCHEDULE 13G, 2026-11-05).
Purpose of Transaction (Item 4)
INEOS Limited
Item 4 of the Original Schedule 13D is hereby amended and supplemented by adding the following: On June 30, 2025, INEOS sold 9,040,415 shares of Common Stock in a private transaction to a broker-dealer at a price per share of $7.60. As a result of such sale, the Reporting Persons no longer beneficially own any shares of Common Stock or have any voting power or dispositive power over any shares of Common Stock.Item 4 of the SCHEDULE 13D/A filed 2025-07-02
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-02 | INEOS Limited | 0% | SCHEDULE 13D/A |
| 2025-08-13 | Hotchkis and Wiley Capital Management, LLC | 9.56% | SCHEDULE 13G/A |
| 2025-11-14 | Rubric Capital Management LP | 9.09% | SCHEDULE 13G |
| 2025-11-14 | Hotchkis and Wiley Capital Management, LLC | 7.74% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-24 | BlackRock, Inc. | 7.7% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Capital Management | 5.25% | SCHEDULE 13G |
| 2026-05-08 | Hotchkis and Wiley Capital Management, LLC | 4.9% | SCHEDULE 13G/A |
| 2026-07-14 | Dimensional Fund Advisors LP | 6% | SCHEDULE 13G/A |
| 2026-07-31 | Vanguard Portfolio Management | 5.65% | SCHEDULE 13G |
| 2026-11-05 | Fmr LLC | 7.7% | SCHEDULE 13G |
Questions about who owns Ecovyst Inc
Who owns Ecovyst Inc?
On this page, 6 holders' latest ownership filings report 5% or more of Ecovyst Inc: Rubric Capital Management LP (9.09%, Schedule 13G, filed 2025-11-14), BlackRock, Inc. (7.7%, Schedule 13G/A, filed 2026-04-24), Fmr LLC (7.7%, Schedule 13G, filed 2026-11-05), Dimensional Fund Advisors LP (6%, Schedule 13G/A, filed 2026-07-14) and Vanguard Portfolio Management (5.65%, Schedule 13G, filed 2026-07-31); 1 more is listed above.
Who are the largest shareholders of Ecovyst Inc?
By the share each holder's latest filing reports, the largest holders of Ecovyst Inc on this page are Rubric Capital Management LP (9.09%), BlackRock, Inc. (7.7%) and Fmr LLC (7.7%).
When did Rubric Capital Management LP buy into Ecovyst Inc?
The filings give report dates, not purchase dates. The earliest filing from Rubric Capital Management LP on this page is the Schedule 13G, filed 2025-11-14, reporting 9.09%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 11 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Ecovyst Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| August 24, 2026 | Leadership change: Laurie Bergman appointed, Chief Financial Officer | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.