ESSEX INVESTMENT MANAGEMENT CO LLC

Est. AUM

$631.7M

13F long equity, this entity only

Positions

305

Period

Mar 2026 (Q1)

SEC EDGAR

View filings ↗

Mar 2026 (Q1)

#	Issuer	Class	Value	Shares	% Portfolio	Discretion
1	TOWER SEMICONDUCTOR LTD	COM	$20.3M	115933	3.22%	SOLE
2	LINCOLN EDL SVCS CORP	COM	$14.5M	355304	2.29%	SOLE
3	STERLING INFRASTRUCTURE INC	COM	$13.1M	32057	2.07%	SOLE
4	KINIKSA PHARMACEUTICALS INTL P	COM	$12.0M	249278	1.90%	SOLE
5	LIGAND PHARMACEUTICALS INC	COM	$11.7M	58460	1.85%	SOLE
6	LEONARDO DRS INC	COM	$11.6M	261454	1.84%	SOLE
7	KRATOS DEFENSE & SEC SOLUTIONS	COM	$11.2M	158844	1.77%	SOLE
8	GLOBALSTAR INC	COM	$11.0M	165665	1.74%	SOLE
9	INSMED INC	COM	$10.2M	62676	1.62%	SOLE
10	GRAHAM CORP	COM	$10.1M	128294	1.60%	SOLE
11	MIRUM PHARMACEUTICALS INC	COM	$10.0M	108338	1.58%	SOLE
12	CECO ENVIRONMENTAL CORP	COM	$9.4M	157246	1.48%	SOLE
13	HCI GROUP INC	COM	$8.9M	57634	1.41%	SOLE
14	ARGAN INC	COM	$8.8M	16098	1.39%	SOLE
15	APPLE INC	COM	$8.3M	32580	1.31%	SOLE
16	BRAINSWAY LTD	ADR	$8.2M	618553	1.30%	SOLE
17	AGNICO EAGLE MINES LTD	COM	$7.8M	38643	1.24%	SOLE
18	AMERICAN SUPERCONDUCTOR CORP	COM	$7.7M	227558	1.22%	SOLE
19	AMPRIUS TECHNOLOGIES INC	COM	$7.5M	445441	1.19%	SOLE
20	GE VERNOVA INC	COM	$7.3M	8319	1.15%	SOLE
21	PRIMORIS SVCS CORP	COM	$6.9M	48177	1.09%	SOLE
22	ADAPTIVE BIOTECHNOLOGIES CORP	COM	$6.8M	493403	1.08%	SOLE
23	TETRA TECHNOLOGIES INC DEL	COM	$6.6M	774099	1.04%	SOLE
24	GOLDMAN SACHS GROUP INC	COM	$6.4M	7556	1.01%	SOLE
25	WILLDAN GROUP INC	COM	$6.0M	78292	0.95%	SOLE
26	COHU INC	COM	$5.9M	191885	0.93%	SOLE
27	MICROSOFT CORP	COM	$5.8M	15791	0.93%	SOLE
28	MIRION TECHNOLOGIES INC	COM	$5.7M	309110	0.91%	SOLE
29	AMAZON COM INC	COM	$5.7M	27208	0.90%	SOLE
30	OCEANEERING INTL INC	COM	$5.6M	158374	0.89%	SOLE
31	ADVANCED DRAIN SYS INC DEL	COM	$5.6M	40569	0.88%	SOLE
32	BIOVENTUS INC	COM	$5.5M	603258	0.87%	SOLE
33	MAMAS CREATIONS INC	COM	$5.2M	341657	0.83%	SOLE
34	BWX TECHNOLOGIES INC	COM	$5.2M	25555	0.83%	SOLE
35	PATRICK INDS INC	COM	$5.1M	46228	0.81%	SOLE
36	LSI INDS INC OHIO	COM	$5.1M	274082	0.81%	SOLE
37	ORION GROUP HLDGS INC	COM	$5.0M	461772	0.80%	SOLE
38	NOVOCURE LTD	COM	$4.9M	452370	0.78%	SOLE
39	TRAVERE THERAPEUTICS INC	COM	$4.8M	161705	0.76%	SOLE
40	ARTERIS INC	COM	$4.8M	290319	0.76%	SOLE
41	AVEPOINT INC	COM	$4.7M	498482	0.75%	SOLE
42	ASML HLDG NV	ADR	$4.7M	3556	0.74%	SOLE
43	SYNDAX PHARMACEUTICALS INC	COM	$4.6M	198985	0.74%	SOLE
44	CREXENDO INC	COM	$4.6M	742986	0.73%	SOLE
45	EVERUS CONSTR GROUP	COM	$4.5M	38098	0.71%	SOLE
46	XERIS BIOPHARMA HOLDINGS INC	COM	$4.3M	747769	0.69%	SOLE
47	GLOBUS MED INC	COM	$4.3M	50004	0.68%	SOLE
48	AMBARELLA INC	COM	$4.2M	82387	0.67%	SOLE
49	EXZEO GROUP INC	COM	$4.2M	288111	0.67%	SOLE
50	FREQUENCY ELECTRS INC	COM	$4.1M	93026	0.65%	SOLE

1–50 of 305

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Values in USD (reported in $thousands on 13F). Source: SEC EDGAR.