# EDGAR Filing Document

**Accession Number:** 0001569775
**File Stem:** 0001193125-23-035857
**Filing Date:** 2023-2
**Character Count:** 36839
**Document Hash:** 7cd077e415d59a11f47c75fb5b49caf2
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001193125-23-035857.hdr.sgml**: 20230213

**ACCESSION NUMBER**: 0001193125-23-035857

**CONFORMED SUBMISSION TYPE**: SC 13G/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230213

**DATE AS OF CHANGE**: 20230213

**GROUP MEMBERS**: CCMP CAPITAL ASSOCIATES III GP, LLC

**GROUP MEMBERS**: CCMP CAPITAL ASSOCIATES III, L.P.

**GROUP MEMBERS**: CCMP CAPITAL GP, LLC

**GROUP MEMBERS**: CCMP CAPITAL INVESTORS III (AV-10), L.P.

**GROUP MEMBERS**: CCMP CAPITAL INVESTORS III (AV-7), L.P.

**GROUP MEMBERS**: CCMP CAPITAL INVESTORS III (AV-8), L.P.

**GROUP MEMBERS**: CCMP CAPITAL INVESTORS III (AV-9), L.P.

**GROUP MEMBERS**: CCMP CAPITAL INVESTORS III (EMPLOYEE), L.P.

**GROUP MEMBERS**: CCMP CAPITAL, LP

**GROUP MEMBERS**: CCMP CO-INVEST III A GP, LLC

**GROUP MEMBERS**: QUARTZ CO-INVEST, L.P.

**SUBJECT COMPANY**: 

**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

**FILING VALUES:**
- **FORM TYPE:** SC 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-90364
- **FILM NUMBER:** 23618749

**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
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** CCMP Capital Investors III, L.P.
- **CENTRAL INDEX KEY:** 0001569775
- **IRS NUMBER:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SC 13G/A

**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) 600-9657

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

------

------

**UNITED STATES** 

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549** 

------

**SCHEDULE 13G/A** 

**(Rule 13d-102)** 

**Information Statement Pursuant to Rules 13d-1 and 13d-2** 

**Under the Securities Exchange Act of 1934** 

**(Amendment No. 2)\*** 

------

## ECOVYST INC.
**(Name of Issuer)** 

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

**(Title of Class of Securities)** 

**27923Q 109** 

**(CUSIP Number)** 

**December 31, 2022** 

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

------

Check the appropriate box to designate the rule pursuant to which this schedule is filed:

☐ Rule 13d-1(b)

☐ Rule 13d-1(c)

☒ Rule 13d-1(d)

\* The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 2 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital Investors III, L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;5,446,572\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;5,446,572\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 5,446,572\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 4.5%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 3 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital Investors III (Employee), L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;552,064\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;552,064\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 552,064\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 0.5%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 4 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital Investors III (AV-7), L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,660,544\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,660,544\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 1,660,544\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 1.4%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 5 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital Investors III (AV-8), L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;93,947\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;93,947\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 93,947\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 0.1%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 6 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital Investors III (AV-9), L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,878,125\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,878,125\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 1,878,125\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 1.5%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 7 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital Investors III (AV-10), L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;123,059\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;123,059\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 123,059\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 0.1%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 8 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital Associates III, L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;9,754,311\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;9,754,311\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 9,754,311\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 8.0%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 9 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital Associates III GP, LLC

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;9,754,311\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;9,754,311\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 9,754,311\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 8.0%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; OO

\* See Item 4

------

---

| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 10 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital, LP

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;11,490,444\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;11,490,444\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 11,490,444\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 9.4%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 11 of 19 Pages |

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1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Capital GP, LLC

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;11,490,444\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;11,490,444\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 11,490,444\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 9.4%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; OO

\* See Item 4

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 12 of 19 Pages |

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1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; Quartz Co-Invest, L.P.

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,736,133\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,736,133\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 1,736,133\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 1.4%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; PN

\* See Item 4

------

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 13 of 19 Pages |

---

1. &nbsp;&nbsp;&nbsp;&nbsp; NAME OF REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; CCMP Co-Invest III A GP, LLC

2. &nbsp;&nbsp;&nbsp;&nbsp; CHECK THE APPROPRIATE BOX
IF A MEMBER OF A GROUP\* &nbsp;&nbsp;&nbsp;&nbsp; (a) ☐ (b) ☒

3. &nbsp;&nbsp;&nbsp;&nbsp; SEC USE ONLY

4. &nbsp;&nbsp;&nbsp;&nbsp; CITIZENSHIP OR PLACE OF
ORGANIZATION &nbsp;&nbsp;&nbsp;&nbsp; Delaware

---

| | | |
|:---|:---|:---|
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED VOTING POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,736,133\* |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7. | &nbsp;&nbsp;&nbsp;&nbsp;SOLE DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;0 |
| &nbsp;&nbsp;&nbsp; NUMBER OF<br> SHARES<br> BENEFICIALLY <br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8. | &nbsp;&nbsp;&nbsp;&nbsp;SHARED DISPOSITIVE POWER<br>&nbsp;&nbsp;&nbsp;&nbsp;1,736,133\* |

---

9. &nbsp;&nbsp;&nbsp;&nbsp; AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON &nbsp;&nbsp;&nbsp;&nbsp; 1,736,133\*

10. &nbsp;&nbsp;&nbsp;&nbsp; CHECK IF THE AGGREGATE
AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES &nbsp;&nbsp;&nbsp;&nbsp; ☐

11. &nbsp;&nbsp;&nbsp;&nbsp; PERCENT OF CLASS
REPRESENTED BY AMOUNT IN ROW (9) &nbsp;&nbsp;&nbsp;&nbsp; 1.4%\*

12. &nbsp;&nbsp;&nbsp;&nbsp; TYPE OF REPORTING
PERSON &nbsp;&nbsp;&nbsp;&nbsp; OO

\* See Item 4

------

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 14 of 19 Pages |

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---

| | |
|:---|:---|
| **Item 1(a).** | **Name of Issuer**  |

---

Ecovyst Inc. (the "Issuer")

---

| | |
|:---|:---|
| **Item 1(b).** | **Address of Issuer's Principal Executive Offices**  |

---

300 Lindenwood Drive

Valleybrooke Corporate Center

Malvern, Pennsylvania 19355.

**Item 2.** **(a) Name of Person Filing** <br>

This statement is filed by the entities listed below, all of whom together are referred to herein as the "Reporting Persons":

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i) CCMP Capital Investors III, L.P. ("CCMP Capital Investors");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii) CCMP Capital Investors III (Employee), L.P. ("CCMP Employee");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii) CCMP Capital Investors III (AV-7), L.P. ("CCMP AV-7");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iv) CCMP Capital Investors III (AV-8), L.P. ("CCMP AV-8");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(v) CCMP Capital Investors III (AV-9), L.P. ("CCMP AV-9");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vi) 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");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(vii) CCMP Capital Associates III, L.P. ("CCMP Capital Associates");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(viii) CCMP Capital Associates III GP, LLC ("CCMP Capital Associates GP");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ix) CCMP Capital, LP ("CCMP Capital");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(x) CCMP Capital GP, LLC ("CCMP Capital GP");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(xi) Quartz Co-Invest, L.P. ("Quartz"); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(xii) CCMP Co-Invest III A GP, LLC ("CCMP Co-Invest GP").

The Reporting Persons have entered into a Joint Filing Agreement, dated February 4, 2022 and incorporated herein by reference to Exhibit A to the Schedule 13G filed by the Reporting Persons with the Securities and Exchange Commission (the "SEC") with respect to the Issuer on February 9, 2022, pursuant to which the Reporting Persons have agreed to file this statement jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Act.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(b) Address of Principal Business Office or, if none, Residence** 

All Reporting Persons: c/o CCMP Capital Advisors, LP, 1 Rockefeller Plaza, 16<sup>th</sup> Floor, New York, NY 10020

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(c) Citizenship** 

All Reporting Persons: Delaware

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(d) Title of Class of Securities** 

Common Stock, par value $0.01 per share (the "Common Stock")

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(e) CUSIP Number** 

27923Q 109.

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 15 of 19 Pages |

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**Item 3.** **If this statement is filed pursuant to §§ 240.13d-1(b), or 240.13d-2(b) or (c), check whether the person filing is a:** <br>

☐ Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

☐ Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

☐ Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

☐ Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

☐ An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E).

☐ An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F).

☐ A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G).

☐ A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813).

☐ A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3).

☐ A non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J).

☐ Group, in accordance with §240.13d-1(b)(1)(ii)(K).

**Item 4.** **Ownership** <br>

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(a) Amount beneficially owned** 

As of December 31, 2022, the Reporting Persons may be deemed to beneficially own in the aggregate 11,490,444 shares of the Issuer's Common Stock, representing, in the aggregate, approximately 9.4% of the Issuer's total Common Stock outstanding.

The percentage of the Issuer's outstanding shares of Common Stock held by the Reporting Persons is based on 122,253,152 shares of Common Stock outstanding as of November 17, 2022, as reported in the Issuer's prospectus supplement filed with the SEC pursuant to Rule 424(b)(7) on November 15, 2022.

The general partner of each of the CCMP Capital Funds is CCMP Capital Associates. The general partner of CCMP Capital Associates is CCMP Capital Associates GP. As a result, each of CCMP Capital Associates and CCMP Capital Associates GP may be deemed to share beneficial ownership with respect to the Common Stock held by the CCMP Capital Funds.

The general partner of Quartz is CCMP Co-Invest GP. As a result, CCMP Co-Invest GP may be deemed to share beneficial ownership with respect to the Common Stock held by Quartz.

CCMP Capital Associates GP and CCMP Co-Invest GP are each wholly owned by CCMP Capital.

The general partner of CCMP Capital is CCMP Capital GP. CCMP Capital GP ultimately exercises voting and dispositive power over the securities held by the CCMP Capital Funds and Quartz. As a result, each of CCMP Capital and CCMP Capital GP may be deemed to share beneficial ownership with respect to the Common Stock held by the CCMP Capital Funds and Quartz.

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 16 of 19 Pages |

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CCMP Capital Associates and CCMP Capital Associates GP each may be deemed to beneficially own 9,754,311 shares of the Issuer's Common Stock, consisting of (i) 5,446,572 shares held by CCMP Capital Investors, (ii) 552,064 shares held by CCMP Employee, (iii) 1,660,544 shares held by CCMP AV-7, (iv) 93,947 shares held by CCMP AV-8, (v) 1,878,125 shares held by CCMP AV-9, and (vi) 123,059 shares held by CCMP AV-10.

CCMP Co-Invest GP may be deemed to beneficially own 1,736,133 shares of the Issuer's Common Stock held by Quartz.

CCMP Capital and CCMP Capital GP each may be deemed to beneficially own 11,490,444 shares of the Issuer's Common Stock, consisting of (i) 5,446,572 shares held by CCMP Capital Investors, (ii) 552,064 shares held by CCMP Employee, (iii) 1,660,544 shares held by CCMP AV-7, (iv) 93,947 shares held by CCMP AV-8, (v) 1,878,125 shares held by CCMP AV-9, (vi) 123,059 shares held by CCMP AV-10, and (vii) 1,736,133 shares held by Quartz.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(b) Percent of Class** 

The responses of the Reporting Persons to Row 11 of each of the cover pages to this Schedule 13G/A are hereby incorporated by reference. The percentages represent the percentage of the Issuer's Common Stock beneficially owned by the Reporting Persons.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(c) Number of shares as to which such person has:** 

(i) Sole power to vote or to direct the vote: The responses of the Reporting Persons to Row 5 of each of the cover pages to this Schedule 13G/A are hereby incorporated by reference.

(ii) Shared power to vote or to direct the vote: The responses of the Reporting Persons to Row 6 of each of the cover pages to this Schedule 13G/A are hereby incorporated by reference. See also Item 4(a) above.

(iii) Sole power to dispose or to direct the disposition of: The responses of the Reporting Persons to Row 7 of each of the cover pages to this Schedule 13G/A are hereby incorporated by reference.

(iv) Shared power to dispose or to direct the disposition of: The responses of the Reporting Persons to Row 8 of each of the cover pages to this Schedule 13G/A are hereby incorporated by reference. See also Item 4(a) above.

**Item 5.** **Ownership of Five Percent or Less of a Class** <br>

Not applicable.

**Item 6.** **Ownership of More than Five Percent on Behalf of Another Person** <br>

Not applicable.

**Item 7.** **Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company or Control Person:** <br>

Not applicable.

**Item 8.** **Identification and Classification of Members of the Group** <br>

Not applicable.

**Item 9.** **Notice of Dissolution of Group** <br>

Not applicable.

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 17 of 19 Pages |

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**Item 10.** **Certification** <br>

Not applicable.

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 18 of 19 Pages |

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**SIGNATURES** 

After reasonable inquiry and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this Statement is true, complete and correct.

Dated: February 13, 2023

---

| | |
|:---|:---|
| CCMP CAPITAL INVESTORS III, L.P. | CCMP CAPITAL INVESTORS III, L.P. |
| CCMP CAPITAL INVESTORS III<br> (EMPLOYEE), L.P. | CCMP CAPITAL INVESTORS III<br> (EMPLOYEE), L.P. |
| CCMP CAPITAL INVESTORS III (AV-7),<br> L.P. | CCMP CAPITAL INVESTORS III (AV-7),<br> L.P. |
| CCMP CAPITAL INVESTORS III (AV-8),<br> L.P. | CCMP CAPITAL INVESTORS III (AV-8),<br> L.P. |
| CCMP CAPITAL INVESTORS III (AV-9),<br> L.P. | CCMP CAPITAL INVESTORS III (AV-9),<br> L.P. |
| CCMP CAPITAL INVESTORS III (AV-10),<br> L.P. | CCMP CAPITAL INVESTORS III (AV-10),<br> L.P. |
| By: CCMP Capital Associates III, L.P.,<br> its general partner | By: CCMP Capital Associates III, L.P.,<br> its general partner |
| By: CCMP Capital Associates III GP, LLC,<br> its general partner, | By: CCMP Capital Associates III GP, LLC,<br> its general partner, |
| By: | /s/ Mark McFadden |
|  | Managing Partner |
| CCMP CAPITAL ASSOCIATES III, L.P. | CCMP CAPITAL ASSOCIATES III, L.P. |
| By: CCMP Capital Associates III GP, LLC,<br> its general partner | By: CCMP Capital Associates III GP, LLC,<br> its general partner |
| By: | /s/ Mark McFadden |
|  | Managing Partner |
| CCMP CAPITAL ASSOCIATES III GP, LLC | CCMP CAPITAL ASSOCIATES III GP, LLC |
| By: | /s/ Mark McFadden |
|  | Managing Partner |
| QUARTZ CO-INVEST, L.P. | QUARTZ CO-INVEST, L.P. |
| By: CCMP Co-Invest III A GP, LLC,<br> its general partner | By: CCMP Co-Invest III A GP, LLC,<br> its general partner |
| By: | /s/ Mark McFadden |
|  | Managing Partner |
| CCMP CO-INVEST III A GP, LLC | CCMP CO-INVEST III A GP, LLC |
| By: | /s/ Mark McFadden |
|  | Managing Partner |

---

------

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| | | |
|:---|:---|:---|
| CUSIP No. 27923Q 109 | **13G/A** | Page 19 of 19 Pages |

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---

| | |
|:---|:---|
| CCMP CAPITAL, LP | CCMP CAPITAL, LP |
| By: CCMP Capital GP, LLC its general partner | By: CCMP Capital GP, LLC its general partner |
| By: | /s/ Mark McFadden |
|  | Managing Partner |
| CCMP CAPITAL GP, LLC | CCMP CAPITAL GP, LLC |
| By: | /s/ Mark McFadden |
|  | Managing Partner |

---