# EDGAR Filing Document

**Accession Number:** 0001771044
**File Stem:** 0000950157-25-000552
**Filing Date:** 2025-7
**Character Count:** 8686
**Document Hash:** ceda84b8ee2227d91081a44dfea2bf92
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950157-25-000552.hdr.sgml**: 20250702

**ACCESSION NUMBER**: 0000950157-25-000552

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20250702

**DATE AS OF CHANGE**: 20250702

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Ecovyst Inc.
- **CENTRAL INDEX KEY:** 0001708035
- **STANDARD INDUSTRIAL CLASSIFICATION:** CHEMICALS & ALLIED PRODUCTS [2800]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 813406833
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-90364
- **FILM NUMBER:** 251101596

**BUSINESS ADDRESS:**
- **STREET 1:** 600 LEE ROAD, SUITE 200
- **CITY:** WAYNE
- **STATE:** PA
- **ZIP:** 19087
- **BUSINESS PHONE:** 484-617-1200

**MAIL ADDRESS:**
- **STREET 1:** 600 LEE ROAD, SUITE 200
- **CITY:** WAYNE
- **STATE:** PA
- **ZIP:** 19087

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** PQ Group Holdings Inc.
- **DATE OF NAME CHANGE:** 20170531
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** INEOS Ltd
- **CENTRAL INDEX KEY:** 0001771044

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** Y8
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**BUSINESS ADDRESS:**
- **STREET 1:** FORT ANNE
- **CITY:** DOUGLAS
- **STATE:** Y8
- **ZIP:** IM1 5PD
- **BUSINESS PHONE:** 44 20 7190 6300

**MAIL ADDRESS:**
- **STREET 1:** 38 HANS CRESCENT, KNIGHTSBRIDGE
- **CITY:** LONDON
- **STATE:** X0
- **ZIP:** SW1X 0LZ

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 7)**

**Ecovyst Inc.**

*(Name of Issuer)*

**Common Stock, par value $0.01 per share**

*(Title of Class of Securities)*

**73943T103**

*(CUSIP Number)*

**Jonny Ginns**<br>38 Hans Crescent<br>London X0 SW1X 0LZ<br>44 (0) 7876 141210

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**06/30/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **73943T103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**INEOS Limited** | Name of reporting person<br>**INEOS Limited** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**Y8** | Citizenship or place of organization<br>**Y8** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**0.00** | Aggregate amount beneficially owned by each reporting person<br>**0.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0%** | Percent of class represented by amount in Row (11)<br>**0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**CO** | Type of Reporting Person (See Instructions)<br>**CO** | |

---

| **CUSIP No.** | **73943T103** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**RATCLIFFE JAMES A** | Name of reporting person<br>**RATCLIFFE JAMES A** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**WC** | Source of funds (See Instructions)<br>**WC** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X0** | Citizenship or place of organization<br>**X0** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**0.00** | Aggregate amount beneficially owned by each reporting person<br>**0.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**0%** | Percent of class represented by amount in Row (11)<br>**0%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.01 per share

**(b) Name of Issuer:**
Ecovyst Inc.

**(c) Address of Issuer's Principal Executive Offices:**
600 Lee Road, Suite 200, Wayne, PA, 19087

This Amendment No. 7 amends and supplements the Schedule 13D filed with the Securities and Exchange Commission on March 22, 2019 (the "Original Schedule 13D"), as amended by Amendment No. 1, which was filed with the Commission on May 3, 2021, Amendment No. 2, which was filed with the Commission on May 5, 2021, Amendment No. 3, which was filed with the Commission on November 23, 2021, Amendment No. 4, which was filed with the Commission on December 20, 2021, Amendment No. 5, which was filed with the Commission on May 26, 2023, and Amendment No. 6, which was filed with the Commission on June 27, 2023.  Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Original Schedule 13D.

This Amendment is being filed to amend and supplement Items 4 and 5 as follows:

**Item 4. Purpose of Transaction**

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 5. Interest in Securities of the Issuer**

**(a)**
The Reporting Persons ceased to be the beneficial owners of any shares of Common Stock on June 30, 2025.

**(b)**
The Reporting Persons ceased to be the beneficial owners of any shares of Common Stock on June 30, 2025.

**(c)**
Except for the transaction described in Item 4, none of INEOS, Mr. Ratcliffe or, to the knowledge of either INEOS or Mr. Ratcliffe, any person named on Exhibit A to the Original Schedule 13D has effected any transaction in the Common Stock during the past 60 days.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** INEOS Limited

**Signature:** /s/ Jonny Ginns

**Name/Title:** Jonny Ginns/Director

**Date:** 07/02/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** RATCLIFFE JAMES A

**Signature:** /s/ James A. Ratcliffe

**Name/Title:** James A. Ratcliffe

**Date:** 07/02/2025