WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC

Position in ECVT — Ecovyst Inc.

CIK 1644956 CHICAGO, IL

Position in ECVT

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$10,712,465

-$13,266,561 QoQ

Shares Held

860,439

-53.9% QoQ

Ownership

0.786%

of shares outstanding

% of Portfolio

0.03%

of 13F equity value

Holder Rank

#29

of 206 holders

Holding Since

Jun 2023

13 quarters on record

Voting authority Sole 62% Shared 0% None 38%

Basic Materials · as of Jun 30, 2026

WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $437,349,074 across 7 Specialty Chemicals names. ECVT ranks #6 (2.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	LIN	Linde PLC	504,953	$262,040,309
2	KWR	Quaker Chemical Corp	420,535	$66,810,395
3	BCPC	Balchem Corp	314,063	$53,060,943
4	HWKN	Hawkins Inc	191,502	$27,212,434
5	CBT	Cabot Corp	185,077	$16,808,693
6	ECVT	Ecovyst Inc. This page	860,439	$10,712,465
7	ESI	Element Solutions Inc	14,740	$703,835

13 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$10,712,465	860,439	-53.9%	Shares	Sole	2026-08-12
2026-03-31	$23,979,026	1,864,621	-31.7%	Shares	Sole	2026-05-08
2025-12-31	$26,550,727	2,728,749	-9.5%	Shares	Sole	2026-02-09
2025-09-30	$26,404,041	3,014,160	-5.7%	Shares	Sole	2025-11-12
2025-06-30	$26,310,503	3,196,902	-7.6%	Shares	Sole	2025-07-29
2025-03-31	$21,460,159	3,461,316	-3.9%	Shares	Sole	2025-05-09
2024-12-31	$27,514,283	3,601,346	+1.9%	Shares	Sole	2025-02-10
2024-09-30	$24,207,954	3,534,008	-3.0%	Shares	Sole	2024-11-08
2024-06-30	$32,674,776	3,642,673	-0.2%	Shares	Sole	2024-08-08
2024-03-31	$40,702,004	3,650,404	+10.1%	Shares	Sole	2024-05-08
2023-12-31	$32,401,228	3,316,400	-1.6%	Shares	Sole	2024-02-09
2023-09-30	$33,166,792	3,370,609	+4.0%	Shares	Sole	2023-11-09
2023-06-30	$37,134,972	3,240,399	—	Shares	Sole	2023-08-11
No filing history on record for this holder in this stock.