ESSEX INVESTMENT MANAGEMENT CO LLC

BOSTON, MA · CIK 201772 · 13F filing filed 2026-08-06

SEC-registered investment adviser since 1998 · limited liability company

Assets managed$712.7m
Staff13 · 9 in investment roles
Main clients (by assets)State and local governments 32%, High net worth individuals 18%, Mutual funds and ETFs 17%
Websiteessexinvest.com
Form ADV · 2026-03-30SEC adviser record

Legal entityESSEX INVESTMENT MANAGEMENT COMPANY, LLC (US)

Kindinstitutions
Others nearbyBoston, MA, Evanston, IL

As an employer

Offices in1 country

Where they work

people there (dot area)number not reportedmain officeHover or tap a dot. Australian and UK companies are placed at their business or registered address, with their staff across the whole country.

Offices

From Form ADV: the main office and the other offices where it does advisory work (at most the 25 largest), with the people doing investment work at each. “About” is worked out: the firm's investment staff less its other offices. Each city links to the other managers there.

City	Country	People
Boston, MA (main office)United States	United States	about 4
Evanston, ILUnited States	United States	5

Map: places from GeoNames (CC BY 4.0), outlines from Natural Earth.

$763.4m reported value +20.8% vs Q1 2026

306positions

20.1%in top 10

27 new 30 added 155 reduced 26 sold out vs Q1 2026

Holdings, Q2 2026

The small lines show how much was held over the last 4 quarters (adjusted for stock splits).

#	Security	Ticker	Shares	Value	% of portfolio	Change	Shares change
1	TOWER SEMICONDUCTOR LTD SHS NEW TSEM	TSEM	105,543	$27.5m3.60%	3.60%	Reduced -10.4k	-10,390 -9.0%
2	LINCOLN EDL SVCS CORP COM LINC	LINC	340,366	$17.0m2.22%	2.22%	Reduced -14.9k	-14,938 -4.2%
3	KINIKSA PHARMACEUTICALS INTL ORD SHS CL A KNSA	KNSA	241,382	$15.4m2.02%	2.02%	Reduced -7.9k	-7,896 -3.2%
4	OUSTER INC COM NEW OUST	OUST	226,028	$14.1m1.85%	1.85%	Added +41.4k	+41,443 22.4%
5	LIGAND PHARMACEUTICALS INC COM NEW LGND	LGND	43,567	$13.8m1.80%	1.80%	Reduced -14.9k	-14,893 -25.5%
6	CECO ENVIRONMENTAL CORP COM CECO	CECO	150,416	$13.6m1.79%	1.79%	Reduced -6.8k	-6,830 -4.3%
7	STERLING INFRASTRUCTURE INC COM STRL	STRL	16,155	$13.6m1.78%	1.78%	Reduced -15.9k	-15,902 -49.6%
8	ARTERIS INC COM AIP	AIP	277,665	$13.5m1.77%	1.77%	Reduced -12.7k	-12,654 -4.4%
9	MIRUM PHARMACEUTICALS INC COM MIRM	MIRM	105,669	$12.4m1.62%	1.62%	Reduced -2.7k	-2,669 -2.5%
10	ARGAN INC COM AGX	AGX	15,467	$12.4m1.62%	1.62%	Reduced -631	-631 -3.9%
11	GRAHAM CORP COM GHM	GHM	93,405	$11.6m1.51%	1.51%	Reduced -34.9k	-34,889 -27.2%
12	LEONARDO DRS INC COM DRS	DRS	250,215	$10.7m1.40%	1.40%	Reduced -11.2k	-11,239 -4.3%
13	ADAPTIVE BIOTECHNOLOGIES COR COM ADPT	ADPT	472,763	$10.1m1.33%	1.33%	Reduced -20.6k	-20,640 -4.2%
14	WERNER ENTERPRISES INC COM WERN	WERN	231,625	$10.1m1.32%	1.32%	New
15	HCI GROUP INC COM HCI	HCI	56,260	$9.9m1.29%	1.29%	Reduced -1.4k	-1,374 -2.4%
16	GE VERNOVA INC COM GEV	GEV	8,283	$9.7m1.27%	1.27%	Reduced -36	-36 -0.4%
17	COHU INC COM COHU	COHU	131,170	$9.7m1.27%	1.27%	Reduced -60.7k	-60,715 -31.6%
18	APPLE INC COM AAPL	AAPL	32,427	$9.4m1.23%	1.23%	Reduced -153	-153 -0.5%
19	AMERICAN SUPERCONDUCTOR CORP SHS NEW AMSC	AMSC	221,933	$9.2m1.21%	1.21%	Reduced -5.6k	-5,625 -2.5%
20	BRAINSWAY LTD SPONSORED ADS BWAY	BWAY	592,606	$9.2m1.20%	1.20%	Reduced -25.9k	-25,947 -4.2%
21	TETRA TECHNOLOGIES INC DEL COM TTI	TTI	741,007	$8.4m1.10%	1.10%	Reduced -33.1k	-33,092 -4.3%
22	LSI INDS INC OHIO COM LYTS	LYTS	295,820	$7.9m1.03%	1.03%	Added +21.7k	+21,738 7.9%
23	MARVELL TECHNOLOGY INC COM MRVL	MRVL	25,911	$7.7m1.01%	1.01%	Reduced -10.3k	-10,292 -28.4%
24	KRATOS DEFENSE & SEC SOLUTIO COM NEW KTOS	KTOS	153,576	$7.7m1.00%	1.00%	Reduced -5.3k	-5,268 -3.3%
25	TRAVERE THERAPEUTICS INC COM TVTX	TVTX	133,866	$7.6m1.00%	1.00%	Reduced -27.8k	-27,839 -17.2%
26	GOLDMAN SACHS GROUP INC COM GS	GS	7,513	$7.6m1.00%	1.00%	Reduced -43	-43 -0.6%
27	PATRICK INDS INC COM PATK	PATK	82,960	$7.4m0.98%	0.98%	Added +36.7k	+36,732 79.5%
28	ORION GROUP HLDGS INC COM ORN	ORN	442,603	$7.4m0.98%	0.98%	Reduced -19.2k	-19,169 -4.2%
29	ASML HOLDING N V N Y REGISTRY SHS ASML	ASML	3,538	$7.0m0.92%	0.92%	Reduced -18	-18 -0.5%
30	AMBARELLA INC SHS AMBA	AMBA	79,997	$6.9m0.90%	0.90%	Reduced -2.4k	-2,390 -2.9%
31	NOVOCURE LTD ORD SHS NVCR	NVCR	439,648	$6.7m0.87%	0.87%	Reduced -12.7k	-12,722 -2.8%
32	AMAZON COM INC COM AMZN	AMZN	27,062	$6.4m0.84%	0.84%	Reduced -146	-146 -0.5%
33	AVEPOINT INC COM CL A AVPT	AVPT	571,541	$6.4m0.84%	0.84%	Added +73.1k	+73,059 14.7%
34	ADVANCED DRAIN SYS INC DEL COM WMS	WMS	40,413	$6.3m0.83%	0.83%	Reduced -156	-156 -0.4%
35	SEMTECH CORP COM SMTC	SMTC	38,226	$6.2m0.81%	0.81%	Reduced -12.4k	-12,418 -24.5%
36	OCEANEERING INTL INC COM OII	OII	151,463	$6.1m0.80%	0.80%	Reduced -6.9k	-6,911 -4.4%
37	EVERUS CONSTR GROUP COM ECG	ECG	36,377	$6.0m0.79%	0.79%	Reduced -1.7k	-1,721 -4.5%
38	AGNICO EAGLE MINES LTD COM AEM	AEM	38,462	$6.0m0.78%	0.78%	Reduced -181	-181 -0.5%
39	LIQUIDIA CORPORATION COM NEW LQDA	LQDA	74,743	$6.0m0.78%	0.78%	Reduced -3.4k	-3,428 -4.4%
40	WILLDAN GROUP INC COM WLDN	WLDN	74,890	$5.9m0.78%	0.78%	Reduced -3.4k	-3,402 -4.3%
41	FREQUENCY ELECTRS INC COM FEIM	FEIM	89,043	$5.9m0.77%	0.77%	Reduced -4.0k	-3,983 -4.3%
42	MICROSOFT CORP COM MSFT	MSFT	15,714	$5.9m0.77%	0.77%	Reduced -77	-77 -0.5%
43	MAMAS CREATIONS INC COM MAMA	MAMA	326,938	$5.8m0.76%	0.76%	Reduced -14.7k	-14,719 -4.3%
44	XERIS BIOPHARMA HOLDINGS INC COM XERS	XERS	715,608	$5.7m0.74%	0.74%	Reduced -32.2k	-32,161 -4.3%
45	PARK AEROSPACE CORP COM PKE	PKE	143,663	$5.5m0.72%	0.72%	Reduced -6.2k	-6,230 -4.2%
46	BIODESIX INC COM BDSX	BDSX	241,915	$5.5m0.71%	0.71%	Added +109.8k	+109,829 83.2%
47	XOMETRY INC CLASS A COM XMTR	XMTR	55,919	$5.4m0.71%	0.71%	New
48	BLUELINX HLDGS INC COM NEW BXC	BXC	86,593	$5.4m0.70%	0.70%	New
49	MITEK SYS INC COM NEW MITK	MITK	263,913	$5.3m0.70%	0.70%	Reduced -11.7k	-11,689 -4.2%
50	CREXENDO INC COM CXDO	CXDO	710,874	$5.3m0.70%	0.70%	Reduced -32.1k	-32,112 -4.3%
51	MIRION TECHNOLOGIES INC COM CL A MIR	MIR	295,060	$5.3m0.69%	0.69%	Reduced -14.1k	-14,050 -4.5%
52	RED VIOLET INC COM RDVT	RDVT	82,555	$5.3m0.69%	0.69%	Added +21.6k	+21,613 35.5%
53	JAZZ PHARMACEUTICALS PLC SHS USD JAZZ	JAZZ	21,665	$5.2m0.68%	0.68%	Reduced -113	-113 -0.5%
54	DIODES INC COM DIOD	DIOD	46,732	$5.1m0.67%	0.67%	Reduced -2.1k	-2,137 -4.4%
55	APYX MEDICAL CORPORATION COM APYX	APYX	1,136,630	$5.1m0.67%	0.67%	Added +235.2k	+235,232 26.1%
56	BWX TECHNOLOGIES INC COM BWXT	BWXT	25,431	$5.0m0.65%	0.65%	Reduced -124	-124 -0.5%
57	OCULAR THERAPEUTIX INC COM OCUL	OCUL	482,154	$4.7m0.62%	0.62%	Added +89.4k	+89,436 22.8%
58	SPROUTS FMRS MKT INC COM SFM	SFM	55,176	$4.7m0.61%	0.61%	Added +44.8k	+44,773 430.4%
59	LIGHTPATH TECHNOLOGIES INC COM CL A LPTH	LPTH	285,052	$4.7m0.61%	0.61%	Added +68.5k	+68,521 31.6%
60	INSMED INC COM PAR $.01 INSM	INSM	42,991	$4.6m0.60%	0.60%	Reduced -19.7k	-19,685 -31.4%
61	EXZEO GROUP INC COM SHS XZO	XZO	268,704	$4.5m0.59%	0.59%	Reduced -19.4k	-19,407 -6.7%
62	MISTRAS GROUP INC COM MG	MG	257,127	$4.5m0.59%	0.59%	Reduced -11.4k	-11,440 -4.3%
63	SI-BONE INC COM SIBN	SIBN	271,404	$4.4m0.58%	0.58%	Added +58.9k	+58,916 27.7%
64	CONCENTRA GROUP HOLDINGS PAR COMMON STOCK CON	CON	148,836	$4.4m0.58%	0.58%	Reduced -789	-789 -0.5%
65	INTERFACE INC COM TILE	TILE	123,401	$4.4m0.58%	0.58%	New
66	GRIFFON CORP COM GFF	GFF	44,937	$4.4m0.57%	0.57%	Reduced -2.1k	-2,139 -4.5%
67	JOHNSON OUTDOORS INC CL A JOUT	JOUT	94,176	$4.3m0.57%	0.57%	Added +31.3k	+31,312 49.8%
68	DAKTRONICS INC COM DAKT	DAKT	216,428	$4.2m0.55%	0.55%	Added +34.3k	+34,342 18.9%
69	COLUMBUS MCKINNON CORP N Y COM CMCO	CMCO	278,316	$4.2m0.55%	0.55%	Added +66.6k	+66,609 31.5%
70	BADGER METER INC COM BMI	BMI	28,041	$4.2m0.55%	0.55%	Added +18.9k	+18,883 206.2%
71	908 DEVICES INC COM MASS	MASS	470,244	$4.1m0.54%	0.54%	Reduced -21.0k	-20,977 -4.3%
72	LIQUIDITY SVCS INC COM LQDT	LQDT	103,302	$4.0m0.53%	0.53%	Reduced -4.7k	-4,702 -4.3%
73	PRECIGEN INC COM PGEN	PGEN	706,294	$4.0m0.53%	0.53%	New
74	AXSOME THERAPEUTICS INC COM AXSM	AXSM	16,244	$4.0m0.52%	0.52%	Reduced -84	-84 -0.5%
75	AMPRIUS TECHNOLOGIES INC COMMON STOCK AMPX	AMPX	284,595	$3.9m0.52%	0.52%	Reduced -160.8k	-160,846 -36.1%
76	GLOBUS MED INC CL A GMED	GMED	49,677	$3.9m0.51%	0.51%	Reduced -327	-327 -0.7%
77	LANTRONIX INC COM NEW LTRX	LTRX	662,070	$3.9m0.51%	0.51%	Added +319.6k	+319,581 93.3%
78	LEGACY ED INC COM LGCY	LGCY	329,894	$3.9m0.51%	0.51%	Added +186.5k	+186,455 130.0%
79	RISKIFIED LTD SHS CL A RSKD	RSKD	769,085	$3.9m0.51%	0.51%	Reduced -33.9k	-33,947 -4.2%
80	AMERANT BANCORP INC CL A AMTB	AMTB	150,236	$3.8m0.50%	0.50%	Reduced -6.6k	-6,582 -4.2%
81	SOPHIA GENETICS SA ORDINARY SHARES SOPH	SOPH	663,428	$3.8m0.50%	0.50%	Reduced -29.4k	-29,381 -4.2%
82	NUVATION BIO INC COM CL A NUVB	NUVB	671,041	$3.8m0.50%	0.50%	New
83	GENTHERM INC COM THRM	THRM	107,970	$3.7m0.48%	0.48%	Reduced -5.2k	-5,168 -4.6%
84	BLACKSKY TECHNOLOGY INC CL A NEW BKSY	BKSY	130,281	$3.6m0.48%	0.48%	Reduced -5.8k	-5,823 -4.3%
85	ARCUTIS BIOTHERAPEUTICS INC COM ARQT	ARQT	137,500	$3.6m0.47%	0.47%	Reduced -6.4k	-6,434 -4.5%
86	DOLLAR TREE INC COM DLTR	DLTR	29,455	$3.6m0.47%	0.47%	Reduced -159	-159 -0.5%
87	BGC GROUP INC CL A BGC	BGC	321,484	$3.4m0.45%	0.45%	Reduced -15.3k	-15,297 -4.5%
88	AMBAC FINL GROUP INC COM NEW OSG	OSG	539,289	$3.4m0.44%	0.44%	Added +121.1k	+121,086 28.9%
89	FORUM ENERGY TECHNOLOGIES IN COM FET	FET	66,611	$3.3m0.44%	0.44%	New
90	INFORMATION SVCS GROUP INC COM III	III	808,345	$3.3m0.44%	0.44%	Added +424.9k	+424,945 110.8%
91	NEUROPACE INC COM NPCE	NPCE	208,703	$3.3m0.43%	0.43%	Reduced -9.0k	-9,035 -4.2%
92	FREIGHTCAR AMER INC COM RAIL	RAIL	337,662	$3.3m0.43%	0.43%	Reduced -14.7k	-14,681 -4.2%
93	NOVANTA INC COM NOVT	NOVT	19,811	$3.2m0.42%	0.42%	Reduced -892	-892 -4.3%
94	CROWDSTRIKE HLDGS INC CL A CRWD	CRWD	4,169	$3.2m0.42%	0.42%	New
95	CODA OCTOPUS GROUP INC COM NEW CODA	CODA	322,278	$3.1m0.41%	0.41%	Added +132.6k	+132,638 69.9%
96	BAKER HUGHES COMPANY CL A BKR	BKR	54,375	$3.0m0.40%	0.40%	Reduced -307	-307 -0.6%
97	IBEX LTD SHS NEW IBEX	IBEX	98,156	$3.0m0.39%	0.39%	Added +40.4k	+40,398 69.9%
98	DOCEBO INC COM DCBO	DCBO	165,095	$3.0m0.39%	0.39%	Reduced -7.3k	-7,272 -4.2%
99	EVERCORE INC CLASS A EVR	EVR	8,573	$2.9m0.38%	0.38%	Reduced -366	-366 -4.1%
100	BRC INC COM CL A COM CL A		2,624,990	$2.9m0.38%	0.38%	New

Sold out since Q1 2026

Security	Ticker	Shares held before	Value then
GLOBALSTAR INC GSAT	GSAT	165,665	$11.0m165.7k shares
PRIMORIS SVCS CORP PRIM	PRIM	48,177	$6.9m48.2k shares
BIOVENTUS INC BVS	BVS	603,258	$5.5m603.3k shares
SYNDAX PHARMACEUTICALS INC SNDX	SNDX	198,985	$4.6m199.0k shares
AGIOS PHARMACEUTICALS INC AGIO	AGIO	103,177	$3.5m103.2k shares
EVERQUOTE INC EVER	EVER	217,075	$3.3m217.1k shares
SALESFORCE INC CRM	CRM	17,854	$3.3m17.9k shares
VAREX IMAGING CORP VREX	VREX	279,551	$3.0m279.6k shares
INFUSYSTEM HLDGS INC INFU	INFU	299,332	$2.8m299.3k shares
CARECLOUD INC CCLD	CCLD	697,836	$2.5m697.8k shares
MONTROSE ENVIRONMENTAL GROUP ONT	ONT	111,473	$2.4m111.5k shares
EXTREME NETWORKS EXTR	EXTR	158,032	$2.4m158.0k shares
CS DISCO INC LAW	LAW	539,314	$2.1m539.3k shares
GENCOR INDS INC GENC	GENC	129,563	$1.9m129.6k shares
ZSCALER INC ZS	ZS	11,412	$1.6m11.4k shares
ALLOT LTD ALLT	ALLT	226,056	$1.5m226.1k shares
ENERGY RECOVERY INC ERII	ERII	132,322	$1.3m132.3k shares
FLUENCE ENERGY INC FLNC	FLNC	25,576	$351.9k25.6k shares
BYD CO LTD BYDDY	BYDDY	20,199	$275.3k20.2k shares
NEUROONE MED TECHNOLOGIES CO		261,953	$203.4k262.0k shares
INSPIREMD INC NSPR	NSPR	114,085	$186.0k114.1k shares
GEOSPACE TECHNOLOGIES CORP GEOS	GEOS	13,636	$166.4k13.6k shares
AWARE INC MASS AWRE	AWRE	43,105	$53.9k43.1k shares
DUPONT DE NEMOURS INC DWDP	DWDP	238	$32.7k238 shares
TRANE TECHNOLOGIES PLC TT	TT	33	$13.8k33 shares