MARSHALL WACE, LLP

Position in ERII — Energy Recovery, Inc.

CIK 1318757 LONDON, X0

Position in ERII

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$1,070,409

-$405,261 QoQ

Shares Held

106,297

-2.8% QoQ

Ownership

0.206%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2021

14 quarters on record

Voting authority Sole 0.ToString("F0")% Shared 100.ToString("F0")% None 0.ToString("F0")%

Industrials · as of Mar 31, 2026

MARSHALL WACE, LLP holds $27,674,853 across 6 Pollution & Treatment Controls names. ERII ranks #5 (3.9% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CECO	Ceco Environmental Corp	251,904	$15,008,439
2	VLTO	Veralto Corp	60,940	$5,388,314
3	ZWS	Zurn Elkay Water Solutions Corp	81,752	$3,665,759
4	ARQ	Arq, Inc.	809,705	$2,072,844
5	ERII	Energy Recovery, Inc. This page	106,297	$1,070,409
6	ZONE	CleanCore Solutions, Inc.	1,317,667	$469,088

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$1,070,409	106,297	-2.8%	Shares	Other	2026-05-15
2025-12-31	$1,475,670	109,390	-54.3%	Shares	Other	2026-02-13
2025-09-30	$3,691,377	239,389	+376.7%	Shares	Other	2025-11-13
2025-06-30	$641,734	50,214	+6.2%	Shares	Other	2025-08-13
2025-03-31	$751,341	47,284	-73.4%	Shares	Other	2025-05-15
2024-12-31	$2,611,160	177,630	+44.7%	Shares	Other	2025-02-13
2024-03-31	$1,938,996	122,799	+0.7%	Shares	Other	2024-05-15
2023-03-31	$2,810,578	121,934	+525.9%	Shares	Other	2023-05-15
2022-12-31	$399,186	19,482	-58.4%	Shares	Other	2023-02-14
2022-09-30	$1,017,432	46,800	-24.1%	Shares	Other	2022-11-14
2022-06-30	$1,197,107	61,643	+192.8%	Shares	Other	2022-08-15
2022-03-31	$424,047	21,055	-86.5%	Shares	Other	2022-05-16
2021-09-30	$2,972,828	156,218	+269.8%	Shares	Sole	2021-11-15
2021-03-31	$774,846	42,249	—	Shares	Sole	2021-05-17
No filing history on record for this holder in this stock.