Statement of Changes in Beneficial Ownership (4)

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response... 0.5
	Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person ^* CCMP Capital, LP	2. Issuer Name and Ticker or Trading Symbol Ecovyst Inc. [ ECVT ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below)
(Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP, 200 PARK AVENUE, SUITE 1700	3. Date of Earliest Transaction (MM/DD/YYYY) 8/8/2022
(Street) NEW YORK, NY 10166 (City) (State) (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) ___ Form filed by One Reporting Person _ X _ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	8/8/2022		S		6162114	D	$8.3563	15910316	I	By CCMP Capital Investors III, L.P. ⁽¹⁾⁽³⁾
Common Stock	8/8/2022		S		624593	D	$8.3563	1612671	I	By CCMP Capital Investors III (Employee), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/8/2022		S		1878698	D	$8.3563	4850719	I	CCMP Capital Investors III (AV-7), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/8/2022		S		106288	D	$8.3563	274433	I	CCMP Capital Investors III (AV-8), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/8/2022		S		2124864	D	$8.3563	5486308	I	CCMP Capital Investors III (AV-9), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/8/2022		S		139226	D	$8.3563	359473	I	CCMP Capital Investors III (AV-10), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/8/2022		S		1964217	D	$8.3563	5071524	I	Quartz Co-Invest L.P. ⁽²⁾⁽³⁾
Common Stock	8/10/2022		S		924316	D	$8.3563	14986000	I	By CCMP Capital Investors III, L.P. ⁽¹⁾⁽³⁾
Common Stock	8/10/2022		S		93689	D	$8.3563	1518982	I	By CCMP Capital Investors III (Employee), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/10/2022		S		281805	D	$8.3563	4568914	I	CCMP Capital Investors III (AV-7), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/10/2022		S		15943	D	$8.3563	258490	I	CCMP Capital Investors III (AV-8), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/10/2022		S		318730	D	$8.3563	5167578	I	CCMP Capital Investors III (AV-9), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/10/2022		S		20884	D	$8.3563	338589	I	CCMP Capital Investors III (AV-10), L.P. ⁽¹⁾⁽³⁾
Common Stock	8/10/2022		S		294633	D	$8.3563	4776891	I	Quartz Co-Invest L.P. ⁽²⁾⁽³⁾

*Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)*
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)			11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:
(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 1 of 2.

Reporting Owners
Reporting Owner Name / Address	Relationships
Reporting Owner Name / Address	Director	10% Owner	Officer	Other
CCMP Capital, LP C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital GP, LLC C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital Investors III, L.P. C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital Associates III GP, LLC C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital Associates III, L.P. C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital Investors III (Employee), L.P. C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital Investors III (AV-7), L.P. C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital Investors III (AV-8), L.P. C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital Investors III (AV-9), L.P. C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X
CCMP Capital Investors III (AV-10), L.P. C/O CCMP CAPITAL ADVISORS, LP 200 PARK AVENUE, SUITE 1700 NEW YORK, NY 10166		X

Signatures
CCMP CAPITAL, LP, By: CCMP Capital GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL GP, LLC, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL ASSOCIATES III, L.P., By: CCMP Capital Associates III GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL ASSOCIATES III GP, LLC, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL INVESTORS III, L.P., By: CCMP Capital Associates III, L.P., its general partner, By: CCMP Capital Associates III GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL INVESTORS III (EMPLOYEE), L.P., By: CCMP Capital Associates III, L.P., its general partner, By: CCMP Capital Associates III GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL INVESTORS III (AV-7), L.P., By: CCMP Capital Associates III, L.P., its general partner, By: CCMP Capital Associates III GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL INVESTORS III (AV-8), L.P., By: CCMP Capital Associates III, L.P., its general partner, By: CCMP Capital Associates III GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL INVESTORS III (AV-9), L.P., By: CCMP Capital Associates III, L.P., its general partner, By: CCMP Capital Associates III GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date
CCMP CAPITAL INVESTORS III (AV-10), L.P., By: CCMP Capital Associates III, L.P., its general partner, By: CCMP Capital Associates III GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner		8/10/2022
^**Signature of Reporting Person		Date

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.
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