ARROWSTREET CAPITAL, LIMITED PARTNERSHIP

Position in ECVT — Ecovyst Inc.

CIK 1164508 BOSTON, MA

Position in ECVT

as of Mar 31, 2026 · filed May 14, 2026 Compact

Position Value

$62,101,377

+$48,546,592 QoQ

Shares Held

4,829,034

+246.6% QoQ

Ownership

4.41%

of shares outstanding

% of Portfolio

0.04%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Sep 2021

10 quarters on record

Voting authority Sole 99.9118457231819.ToString("F0")% Shared 0.ToString("F0")% None 0.08815427681809654.ToString("F0")%

Basic Materials · as of Mar 31, 2026

ARROWSTREET CAPITAL, LIMITED PARTNERSHIP holds $2,359,674,315 across 29 Specialty Chemicals names. ECVT ranks #8 (2.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	LIN	Linde PLC	1,624,728	$805,475,153
2	ECL	Ecolab Inc.	2,243,825	$596,902,326
3	SHW	Sherwin Williams Co	1,027,761	$329,448,788
4	DD	DuPont de Nemours, Inc.	758,225	$104,180,115
5	SOLS	Solstice Advanced Materials Inc.	1,367,124	$104,120,163
6	EMN	Eastman Chemical Co	1,100,815	$84,014,200
7	IFF	International Flavors & Fragrances Inc	997,295	$72,353,752
8	ECVT	Ecovyst Inc. This page	4,829,034	$62,101,377

10 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$62,101,377	4,829,034	+246.6%	Shares	Defined	2026-05-14
2025-12-31	$13,554,785	1,393,092	+102.3%	Shares	Defined	2026-02-13
2025-09-30	$6,031,408	688,517	+4298.3%	Shares	Defined	2025-11-13
2025-06-30	$128,832	15,654	-83.2%	Shares	Defined	2025-08-13
2022-12-31	$824,352	93,042	-86.1%	Shares	Defined	2023-02-14
2022-09-30	$5,663,408	671,020	-1.6%	Shares	Defined	2022-11-14
2022-06-30	$6,714,085	681,633	-16.1%	Shares	Defined	2022-08-15
2022-03-31	$9,388,107	812,120	-8.0%	Shares	Defined	2022-05-13
2021-12-31	$9,040,332	882,845	+4.8%	Shares	Defined	2022-02-14
2021-09-30	$9,822,908	842,445	—	Shares	Defined	2021-11-12
No filing history on record for this holder in this stock.