ESSEX INVESTMENT MANAGEMENT CO LLC

Position in CECO — Ceco Environmental Corp

CIK 201772 BOSTON, MA

Position in CECO

as of Mar 31, 2026 · filed May 11, 2026 Compact

Position Value

$9,368,716

+$124,465 QoQ

Shares Held

157,246

+1.8% QoQ

Ownership

0.438%

of shares outstanding

% of Portfolio

1.49%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

25 quarters on record

Voting authority Sole 52.07191279905371.ToString("F0")% Shared 0.ToString("F0")% None 47.92808720094629.ToString("F0")%

Industrials · as of Mar 31, 2026

ESSEX INVESTMENT MANAGEMENT CO LLC holds $11,510,417 across 3 Pollution & Treatment Controls names. CECO ranks #1 (81.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	CECO	Ceco Environmental Corp This page	157,246	$9,368,716
2	ERII	Energy Recovery, Inc.	132,322	$1,332,482
3	VLTO	Veralto Corp	9,152	$809,219

25 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$9,368,716	157,246	+1.8%	Shares	Sole	2026-05-11
2025-12-31	$9,244,251	154,457	-2.2%	Shares	Sole	2026-02-13
2025-09-30	$8,088,576	157,980	+3.4%	Shares	Sole	2025-11-06
2025-06-30	$4,324,154	152,743	-0.7%	Shares	Sole	2025-08-12
2025-03-31	$3,507,688	153,846	-0.8%	Shares	Sole	2025-05-07
2024-12-31	$4,687,040	155,046	-25.6%	Shares	Sole	2025-02-07
2024-09-30	$5,877,613	208,426	+0.3%	Shares	Sole	2024-10-10
2024-06-30	$5,996,876	207,864	+0.9%	Shares	Sole	2024-08-12
2024-03-31	$4,741,705	205,982	+1.6%	Shares	Sole	2024-05-03
2023-12-31	$4,113,493	202,835	-7.2%	Shares	Sole	2024-02-08
2023-09-30	$3,491,584	218,634	-1.3%	Shares	Sole	2023-11-09
2023-06-30	$2,960,068	221,562	+13.4%	Shares	Sole	2023-08-14
2023-03-31	$2,733,967	195,423	-21.9%	Shares	Sole	2023-05-04
2022-12-31	$2,922,067	250,177	-0.7%	Shares	Sole	2023-02-03
2022-09-30	$2,229,686	251,942	+2.8%	Shares	Sole	2022-11-14
2022-06-30	$1,466,158	245,177	+42.9%	Shares	Sole	2022-08-12
2022-03-31	$941,875	171,562	+4.8%	Shares	Sole	2022-05-09
2021-12-31	$1,019,869	163,703	+8.7%	Shares	Sole	2022-02-10
2021-09-30	$1,060,407	150,626	-0.7%	Shares	Sole	2021-11-09
2021-06-30	$1,085,592	151,619	-7.9%	Shares	Sole	2021-08-12
2021-03-31	$1,304,857	164,547	-9.5%	Shares	Sole	2021-05-12
2020-12-31	$1,265,905	181,883	-15.9%	Shares	Sole	2021-02-12
2020-09-30	$1,577,468	216,388	+3.3%	Shares	Sole	2020-11-12
2020-06-30	$1,380,282	209,451	-0.5%	Shares	Sole	2020-08-04
2020-03-31	$982,829	210,456	—	Shares	Sole	2020-05-04
No filing history on record for this holder in this stock.