<SEC-DOCUMENT>0001193125-22-031258-index.html : 20220209
<SEC-HEADER>0001193125-22-031258.hdr.sgml : 20220209
<ACCEPTANCE-DATETIME>20220208182900
ACCESSION NUMBER:		0001193125-22-031258
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20220209
DATE AS OF CHANGE:		20220208
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:		22603211

	BUSINESS ADDRESS:	
		STREET 1:		300 LINDENWOOD DRIVE
		CITY:			MALVERN
		STATE:			PA
		ZIP:			19355
		BUSINESS PHONE:		610-651-4400

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>d299430dsc13ga.htm
<DESCRIPTION>SC 13G/A
<TEXT>
Document 1 - file: d299430dsc13ga.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.A
<SEQUENCE>2
<FILENAME>d299430dex99a.htm
<DESCRIPTION>EX-99.A
<TEXT>
Document 2 - file: d299430dex99a.htm

</DOCUMENT>
</SEC-DOCUMENT>