# EDGAR Filing Document

**Accession Number:** 0001372939
**File Stem:** 0000899243-23-007353
**Filing Date:** 2023-3
**Character Count:** 11857
**Document Hash:** 49757c9ce59022891502ba3f74c83a84
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000899243-23-007353.hdr.sgml**: 20230307

**ACCESSION NUMBER**: 0000899243-23-007353

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20230307

**FILED AS OF DATE**: 20230307

**DATE AS OF CHANGE**: 20230307

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** CCMP Capital, LP
- **CENTRAL INDEX KEY:** 0001372939
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38221
- **FILM NUMBER:** 23712871

**BUSINESS ADDRESS:**
- **STREET 1:** 245 PARK AVENUE
- **STREET 2:** 16TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10167
- **BUSINESS PHONE:** 212 600-9600

**MAIL ADDRESS:**
- **STREET 1:** 245 PARK AVENUE
- **STREET 2:** 16TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10167

**FORMER NAME:**
- **FORMER CONFORMED NAME:** CCMP Capital, LLC
- **DATE OF NAME CHANGE:** 20060816
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** CCMP Co-Invest III A GP, LLC
- **CENTRAL INDEX KEY:** 0001718021
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38221
- **FILM NUMBER:** 23712869

**BUSINESS ADDRESS:**
- **STREET 1:** C/O CCMP CAPITAL ADVISORS, LP
- **STREET 2:** 277 PARK AVENUE, 27TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10172
- **BUSINESS PHONE:** 2126009600

**MAIL ADDRESS:**
- **STREET 1:** C/O CCMP CAPITAL ADVISORS, LP
- **STREET 2:** 277 PARK AVENUE, 27TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10172
**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Quartz Co-Invest, L.P.
- **CENTRAL INDEX KEY:** 0001620042
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-38221
- **FILM NUMBER:** 23712870

**BUSINESS ADDRESS:**
- **STREET 1:** C/O CCMP CAPITAL ADVISORS, LLC
- **STREET 2:** 245 PARK AVENUE, 16TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10167
- **BUSINESS PHONE:** (212) 600-9600

**MAIL ADDRESS:**
- **STREET 1:** C/O CCMP CAPITAL ADVISORS, LLC
- **STREET 2:** 245 PARK AVENUE, 16TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10167
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Ecovyst Inc.
- **CENTRAL INDEX KEY:** 0001708035
- **STANDARD INDUSTRIAL CLASSIFICATION:** CHEMICALS & ALLIED PRODUCTS [2800]
- **IRS NUMBER:** 813406833
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 300 LINDENWOOD DRIVE
- **CITY:** MALVERN
- **STATE:** PA
- **ZIP:** 19355
- **BUSINESS PHONE:** 484-617-1200

**MAIL ADDRESS:**
- **STREET 1:** 300 LINDENWOOD DRIVE
- **CITY:** MALVERN
- **STATE:** PA
- **ZIP:** 19355

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

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[x] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>CCMP Capital, LP<br><sub>(Last) (First) (Middle)</sub><br>C/O CCMP CAPITAL ADVISORS, LP<br>1 ROCKEFELLER PLAZA, 16TH FLOOR<br><sub>(Street)</sub><br>NEW YORK, NY 10020<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2023-03-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Ecovyst Inc. [ ECVT ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Quartz Co-Invest, L.P.<br><sub>(Last) (First) (Middle)</sub><br>C/O CCMP CAPITAL ADVISORS, LP<br>1 ROCKEFELLER PLAZA, 16TH FLOOR<br><sub>(Street)</sub><br>NEW YORK, NY 10020<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2023-03-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Ecovyst Inc. [ ECVT ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>CCMP Co-Invest III A GP, LLC<br><sub>(Last) (First) (Middle)</sub><br>C/O CCMP CAPITAL ADVISORS, LP<br>1 ROCKEFELLER PLAZA, 16TH FLOOR<br><sub>(Street)</sub><br>NEW YORK, NY 10020<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2023-03-07 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [X] 10% Owner<br>[ ] Officer (give title below) [ ] Other (specify below)<br>_ _ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>Ecovyst Inc. [ ECVT ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[ ] Form filed by One Reporting Person<br>[X] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2023-03-07 |  | S |  | 5446572 | D | $9.95 | 0 | I | By CCMP Capital Investors III, L.P.<sup>(1)(3)</sup> |
| Common Stock | 2023-03-07 |  | S |  | 552064 | D | $9.95 | 0 | I | By CCMP Capital Investors III (Employee), L.P.<sup>(1)(3)</sup> |
| Common Stock | 2023-03-07 |  | S |  | 1660544 | D | $9.95 | 0 | I | CCMP Capital Investors III (AV-7), L.P.<sup>(1)(3)</sup> |
| Common Stock | 2023-03-07 |  | S |  | 93947 | D | $9.95 | 0 | I | CCMP Capital Investors III (AV-8), L.P.<sup>(1)(3)</sup> |
| Common Stock | 2023-03-07 |  | S |  | 1878125 | D | $9.95 | 0 | I | CCMP Capital Investors III (AV-9), L.P.<sup>(1)(3)</sup> |
| Common Stock | 2023-03-07 |  | S |  | 123059 | D | $9.95 | 0 | I | CCMP Capital Investors III (AV-10), L.P.<sup>(1)(3)</sup> |
| Common Stock | 2023-03-07 |  | S |  | 1736133 | D | $9.95 | 0 | I | Quartz Co-Invest L.P.<sup>(2)(3)</sup> |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

---

### Footnotes:

(1) CCMP Capital Associates III, L.P. ("CCMP Capital Associates") is the general partner of each of CCMP Capital Investors III, L.P. ("CCMP Capital Investors"), CCMP Capital Investors III (Employee), L.P. ("CCMP Employee"), CCMP Capital Investors III (AV-7), L.P. ("CCMP AV-7"), CCMP Capital Investors III (AV-8), L.P. ("CCMP AV-8"), CCMP Capital Investors III (AV-9), L.P. ("CCMP AV-9") and CCMP Capital Investors III (AV-10), L.P. ("CCMP AV-10" and, together with CCMP Capital Investors, CCMP Employee, CCMP AV-7, CCMP AV-8 and CCMP AV-9, the "CCMP Capital Funds"). The general partner of CCMP Capital Associates is CCMP Capital Associates III GP, LLC ("CCMP Capital Associates GP").

(2) CCMP Co-Invest III A GP, LLC ("CCMP Co-Invest GP") is the general partner of Quartz Co-Invest, L.P. ("Quartz" and, together with the CCMP Capital Funds, the "CCMP Investors").

(3) CCMP Capital Associates GP and CCMP Co-Invest GP are each wholly owned by CCMP Capital, LP. The general partner of CCMP Capital, LP is CCMP Capital GP, LLC. CCMP Capital GP, LLC ultimately exercises voting and dispositive power over the shares of common stock of Ecovyst Inc. held by the CCMP Investors. As a result, each of CCMP Capital Associates, CCMP Capital Associates GP, CCMP Co-Invest GP, CCMP Capital, LP and CCMP Capital GP, LLC may be deemed to share beneficial ownership with respect to certain of the shares of common stock of Ecovyst Inc. held by the CCMP Investors. Each of the reporting persons disclaims beneficial ownership of these securities except to the extent of its pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of the reported securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose.

**Remarks:**
Form 2 of 2.

**Signature:** QUARTZ CO-INVEST L.P., By: CCMP Co-Invest III A GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner  
**Date:** 2023-03-07

**Signature:** CCMP CO-INVEST III A GP, LLC, By: /s/ Mark McFadden, Title: Managing Partner  
**Date:** 2023-03-07

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**