<SEC-DOCUMENT>0000950157-21-001200-index.html : 20211123
<SEC-HEADER>0000950157-21-001200.hdr.sgml : 20211123
<ACCEPTANCE-DATETIME>20211123160547
ACCESSION NUMBER:		0000950157-21-001200
CONFORMED SUBMISSION TYPE:	SC 13D/A
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20211123
DATE AS OF CHANGE:		20211123
GROUP MEMBERS:		JAMES A. RATCLIFFE

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 13D/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-90364
		FILM NUMBER:		211438540

	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:			INEOS Ltd
		CENTRAL INDEX KEY:			0001771044
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			Y8
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D/A

	BUSINESS ADDRESS:	
		STREET 1:		FORT ANNE
		CITY:			DOUGLAS
		STATE:			Y8
		ZIP:			IM1 5PD
		BUSINESS PHONE:		44 20 7190 6300

	MAIL ADDRESS:	
		STREET 1:		38 HANS CRESCENT, KNIGHTSBRIDGE
		CITY:			LONDON
		STATE:			X0
		ZIP:			SW1X 0LZ
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D/A
<SEQUENCE>1
<FILENAME>sc13da.htm
<DESCRIPTION>AMENDMENT NO. 3
<TEXT>
Document 1 - file: sc13da.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>2
<FILENAME>ex99-1.htm
<DESCRIPTION>POWER-OF-ATTORNEY
<TEXT>
Document 2 - file: ex99-1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>image00001.jpg
<TEXT>
Document 3 - file: image00001.jpg

</DOCUMENT>
</SEC-DOCUMENT>