Ecovyst Inc.

For the period ended Dec 31, 2025. Filed Feb 27, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Feb 27, 2026

ECVT$10.76+2.6%Stored close · as of Nov 9, 2026

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Contents

Signatures

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

			ECOVYST INC.
Date:	February 27, 2026	By:	/s/ MICHAEL FEEHAN
			Michael Feehan
			Vice President and Chief Financial Officer
			(Duly Authorized Officer and Principal Financial and Accounting Officer)

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Kevin M. Fogarty
Signature	Title	Date
/s/ KURT J. BITTING	Chief Executive Officer and Director	February 27, 2026
Kurt J. Bitting	(Principal Executive Officer)
/s/ MICHAEL FEEHAN	Vice President and Chief Financial Officer	February 27, 2026
Michael Feehan	(Principal Financial and Accounting Officer)
/s/ KEVIN M. FOGARTY	Chairperson of the Board	February 27, 2026
/s/ DAVID A. BRADLEY	Director	February 27, 2026
David A. Bradley
/s/ BRYAN K. BROWN	Director	February 27, 2026
Bryan K. Brown
/s/ ANNA CATALANO	Director	February 27, 2026
Anna Catalano
/s/ SUSAN F. WARD	Director	February 27, 2026
Susan F. Ward
/s/ SARAH LORANCE	Director	February 27, 2026
Sarah Lorance
/s/ DONALD ALTHOFF	Director	February 27, 2026
Donald Althoff

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