SEC Form 4

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

1. Name and Address of Reporting Person* CCMP Capital, LP (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip)	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)
	3. Date of Earliest Transaction (Month/Day/Year) 11/17/2022
	4. If Amendment, Date of Original Filed (Month/Day/Year)	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. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction 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)
			Code	V	Amount	(A) or (D)	Price
Common Stock	11/17/2022		S		9,539,428	D	$7.8788	5,446,572	I	By CCMP Capital Investors III, L.P.(1)(3)
Common Stock	11/17/2022		S		966,918	D	$7.8788	552,064	I	By CCMP Capital Investors III (Employee), L.P.(1)(3)
Common Stock	11/17/2022		S		2,908,370	D	$7.8788	1,660,544	I	CCMP Capital Investors III (AV-7), L.P.(1)(3)
Common Stock	11/17/2022		S		164,543	D	$7.8788	93,947	I	CCMP Capital Investors III (AV-8), L.P.(1)(3)
Common Stock	11/17/2022		S		3,289,453	D	$7.8788	1,878,125	I	CCMP Capital Investors III (AV-9), L.P.(1)(3)
Common Stock	11/17/2022		S		215,530	D	$7.8788	123,059	I	CCMP Capital Investors III (AV-10), L.P.(1)(3)
Common Stock	11/17/2022		S		3,040,758	D	$7.8788	1,736,133	I	Quartz Co-Invest L.P.(2)(3)

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction 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 (Month/Day/Year)		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: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

1. Name and Address of Reporting Person* CCMP Capital, LP (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital GP, LLC (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital Investors III, L.P. (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital Associates III GP, LLC (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital Associates III, L.P. (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital Investors III (Employee), L.P. (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital Investors III (AV-7), L.P. (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital Investors III (AV-8), L.P. (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital Investors III (AV-9), L.P. (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

1. Name and Address of Reporting Person* CCMP Capital Investors III (AV-10), L.P. (Last) (First) (Middle) C/O CCMP CAPITAL ADVISORS, LP 1 ROCKEFELLER PLAZA, 16TH FLOOR (Street) NEW YORK NY 10020 (City) (State) (Zip) Relationship of Reporting Person(s) to Issuer Director X 10% Owner Officer (give title below) Other (specify below)

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.

	CCMP CAPITAL, LP, By: CCMP Capital GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner	11/17/2022
	CCMP CAPITAL GP, LLC, By: /s/ Mark McFadden, Title: Managing Partner	11/17/2022
	CCMP CAPITAL ASSOCIATES III, L.P., By: CCMP Capital Associates III GP, LLC, its general partner, By: /s/ Mark McFadden, Title: Managing Partner	11/17/2022
	CCMP CAPITAL ASSOCIATES III GP, LLC, By: /s/ Mark McFadden, Title: Managing Partner	11/17/2022
	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	11/17/2022
	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	11/17/2022
	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	11/17/2022
	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	11/17/2022
	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	11/17/2022
	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	11/17/2022
	** 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.
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.