<SEC-DOCUMENT>0001708035-24-000094-index.html : 20240621
<SEC-HEADER>0001708035-24-000094.hdr.sgml : 20240621
<ACCEPTANCE-DATETIME>20240621161256
ACCESSION NUMBER:		0001708035-24-000094
CONFORMED SUBMISSION TYPE:	11-K
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20231231
FILED AS OF DATE:		20240621
DATE AS OF CHANGE:		20240621

FILER:

	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

	FILING VALUES:
		FORM TYPE:		11-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38221
		FILM NUMBER:		241060313

	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>11-K
<SEQUENCE>1
<FILENAME>form11-kxsavingplanfinanci.htm
<DESCRIPTION>11-K
<TEXT>
Document 1 - file: form11-kxsavingplanfinanci.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>2
<FILENAME>exhibit231-consentofaudito.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 2 - file: exhibit231-consentofaudito.htm

</DOCUMENT>
</SEC-DOCUMENT>