Ecovyst Catalyst Technologies LLC

Form 5500

ECOVYST CATALYST TECHNOLOGIES, LLC

PO Box 834, Valley Forge, Pa 19482 (484) 617-1202 EIN:86-2551862 Plan Admin:Susan Olafson

Year	Plan Name	Participants BOY/EOY	Assets BOY/EOY
2023	Plan NameECOVYST LIFE AND HEALTHCARE PLAN Plan #501 Participants BOY/EOY828 / 0 Assets BOY/EOY$0 / $0	2023	ECOVYST LIFE AND HEALTHCARE PLAN - Plan #501	828 / 0	$0 / $0
2022	Plan NameECOVYST 401(K) SAVINGS PLAN Plan #003 Participants BOY/EOY1,551 / 1,282 Assets BOY/EOY$335,305,458 / $209,602,261	2022	ECOVYST 401(K) SAVINGS PLAN - Plan #003	1,551 / 1,282	$335,305,458 / $209,602,261
2022	Plan NameECO SERVICES HOURLY PENSION PLAN Plan #015 Participants BOY/EOY146 / 146 Assets BOY/EOY$58,569,194 / $42,494,962	2022	ECO SERVICES HOURLY PENSION PLAN - Plan #015	146 / 146	$58,569,194 / $42,494,962
2022	Plan NameECO SERVICES PENSION EQUITY PLAN Plan #010 Participants BOY/EOY73 / 70 Assets BOY/EOY$24,486,164 / $18,133,629	2022	ECO SERVICES PENSION EQUITY PLAN - Plan #010	73 / 70	$24,486,164 / $18,133,629
2022	Plan NameECOVYST LIFE AND HEALTHCARE PLAN Plan #501 Participants BOY/EOY781 / 0 Assets BOY/EOY$0 / $0	2022	ECOVYST LIFE AND HEALTHCARE PLAN - Plan #501	781 / 0	$0 / $0
2021	Plan NameECOVYST 401(K) SAVINGS PLAN Plan #003 Participants BOY/EOY1,902 / 1,551 Assets BOY/EOY$371,587,521 / $335,305,458	2021	ECOVYST 401(K) SAVINGS PLAN - Plan #003	1,902 / 1,551	$371,587,521 / $335,305,458
2021	Plan NameECO SERVICES HOURLY PENSION PLAN Plan #015 Participants BOY/EOY146 / 146 Assets BOY/EOY$54,940,393 / $58,569,194	2021	ECO SERVICES HOURLY PENSION PLAN - Plan #015	146 / 146	$54,940,393 / $58,569,194
2021	Plan NameECO SERVICES PENSION EQUITY PLAN Plan #010 Participants BOY/EOY78 / 73 Assets BOY/EOY$25,518,033 / $24,486,164	2021	ECO SERVICES PENSION EQUITY PLAN - Plan #010	78 / 73	$25,518,033 / $24,486,164
2021	Plan NameECOVYST LIFE AND HEALTHCARE PLAN Plan #501 Participants BOY/EOY743 / 0 Assets BOY/EOY$0 / $0	2021	ECOVYST LIFE AND HEALTHCARE PLAN - Plan #501	743 / 0	$0 / $0