<SEC-DOCUMENT>0001708035-25-000051-index.html : 20250205
<SEC-HEADER>0001708035-25-000051.hdr.sgml : 20250205
<ACCEPTANCE-DATETIME>20250205160954
ACCESSION NUMBER:		0001708035-25-000051
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20250203
FILED AS OF DATE:		20250205
DATE AS OF CHANGE:		20250205

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Althoff Donald L.
		CENTRAL INDEX KEY:			0002023079
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38221
		FILM NUMBER:		25593353

	MAIL ADDRESS:	
		STREET 1:		C/O ECOVYST INC.
		STREET 2:		300 LINDENWOOD DRIVE
		CITY:			MALVERN
		STATE:			PA
		ZIP:			19355

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Ecovyst Inc.
		CENTRAL INDEX KEY:			0001708035
		STANDARD INDUSTRIAL CLASSIFICATION:	CHEMICALS & ALLIED PRODUCTS [2800]
		ORGANIZATION NAME:           	08 Industrial Applications and Services
		IRS NUMBER:				813406833
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wk-form4_1738789787.xml
<DESCRIPTION>FORM 4
<TEXT>
Document 1 - file: wk-form4_1738789787.html

Document 1 - RAW XML: wk-form4_1738789787.xml

</DOCUMENT>
</SEC-DOCUMENT>