<SEC-DOCUMENT>0001193125-23-151964-index.html : 20230524
<SEC-HEADER>0001193125-23-151964.hdr.sgml : 20230524
<ACCEPTANCE-DATETIME>20230523173709
ACCESSION NUMBER:		0001193125-23-151964
CONFORMED SUBMISSION TYPE:	424B7
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20230524
DATE AS OF CHANGE:		20230523

FILER:

	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:		424B7
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-255514
		FILM NUMBER:		23949973

	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>424B7
<SEQUENCE>1
<FILENAME>d491404d424b7.htm
<DESCRIPTION>424B7
<TEXT>
Document 1 - file: d491404d424b7.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g491404g01m56.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g491404g01m56.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g491404g01v00.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g491404g01v00.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g491404g29m56.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g491404g29m56.jpg

</DOCUMENT>
</SEC-DOCUMENT>