Joseph S. Koscinski - 04 Mar 2026 Form 4 Insider Report for Ecovyst Inc. (ECVT)

Role: Vice President, Chief Administrative Officer, General Counsel and Secretary
Signature: /s/ Joseph S. Koscinski
Issuer symbol: ECVT
Transactions as of: 04 Mar 2026
Net transactions value: $0
Form type: 4
Filing time: 06 Mar 2026, 16:00:36 UTC
Previous filing: 05 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Koscinski Joseph S.	Vice President, Chief Administrative Officer, General Counsel and Secretary	C/O ECOVYST INC., 600 LEE ROAD, SUITE 200, WAYNE	/s/ Joseph S. Koscinski	06 Mar 2026	0001717992

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ECVT	Common Stock	Award		+11,052	+1.9%	$11.31^*	595,784	04 Mar 2026	Direct

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Remarks:

Vice President, Chief Administrative Officer, General Counsel and Secretary