ESSEX INVESTMENT MANAGEMENT CO LLC

BOSTON, MA · CIK 201772 · 13F filing filed 2025-08-12

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.

$550.0m reported value +14.7% vs Q1 2025

298positions

19.3%in top 10

25 new 24 added 150 reduced 30 sold out vs Q1 2025

Holdings, Q2 2025

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	KRATOS DEFENSE & SEC SOLUTIO COM NEW KTOS	KTOS	350,352	$16.3m2.96%	2.96%	Reduced -4.3k	-4,315 -1.2%
2	AMERICAN SUPERCONDUCTOR CORP SHS NEW AMSC	AMSC	346,042	$12.7m2.31%	2.31%	Reduced -26.2k	-26,179 -7.0%
3	STERLING INFRASTRUCTURE INC COM STRL	STRL	53,121	$12.3m2.23%	2.23%	Reduced -804	-804 -1.5%
4	LEONARDO DRS INC COM DRS	DRS	254,042	$11.8m2.15%	2.15%	Reduced -1.8k	-1,817 -0.7%
5	AVEPOINT INC COM CL A AVPT	AVPT	512,703	$9.9m1.80%	1.80%	Reduced -6.9k	-6,926 -1.3%
6	MICROSOFT CORP COM MSFT	MSFT	18,485	$9.2m1.67%	1.67%	Reduced -323	-323 -1.7%
7	HCI GROUP INC COM HCI	HCI	59,981	$9.1m1.66%	1.66%	Reduced -17.9k	-17,889 -23.0%
8	LINCOLN EDL SVCS CORP COM LINC	LINC	384,552	$8.9m1.61%	1.61%	Reduced -2.8k	-2,794 -0.7%
9	TOWER SEMICONDUCTOR LTD SHS NEW TSEM	TSEM	195,296	$8.5m1.54%	1.54%	Added +22.2k	+22,237 12.8%
10	GE VERNOVA INC COM GEV	GEV	14,485	$7.7m1.39%	1.39%	Added +7.0k	+7,010 93.8%
11	APPLE INC COM AAPL	AAPL	36,647	$7.5m1.37%	1.37%	Reduced -909	-909 -2.4%
12	ADAPTIVE BIOTECHNOLOGIES COR COM ADPT	ADPT	617,299	$7.2m1.31%	1.31%	Reduced -4.4k	-4,413 -0.7%
13	LIGAND PHARMACEUTICALS INC COM NEW LGND	LGND	60,810	$6.9m1.26%	1.26%	Reduced -892	-892 -1.4%
14	GRAHAM CORP COM GHM	GHM	138,974	$6.9m1.25%	1.25%	Reduced -883	-883 -0.6%
15	WILLDAN GROUP INC COM WLDN	WLDN	107,227	$6.7m1.22%	1.22%	Reduced -29.9k	-29,863 -21.8%
16	INSMED INC COM PAR $.01 INSM	INSM	66,345	$6.7m1.21%	1.21%	Reduced -455	-455 -0.7%
17	AMAZON COM INC COM AMZN	AMZN	29,599	$6.5m1.18%	1.18%	Reduced -688	-688 -2.3%
18	GOLDMAN SACHS GROUP INC COM GS	GS	9,149	$6.5m1.18%	1.18%	Added +57	+57 0.6%
19	MIRION TECHNOLOGIES INC COM CL A MIR	MIR	299,816	$6.5m1.17%	1.17%	Reduced -2.1k	-2,057 -0.7%
20	OUSTER INC COM NEW OUST	OUST	250,172	$6.1m1.10%	1.10%	Reduced -16.6k	-16,592 -6.2%
21	ARGAN INC COM AGX	AGX	27,318	$6.0m1.10%	1.10%	Reduced -8.9k	-8,892 -24.6%
22	MIRUM PHARMACEUTICALS INC COM MIRM	MIRM	112,731	$5.7m1.04%	1.04%	New
23	EVERQUOTE INC COM CL A EVER	EVER	234,677	$5.7m1.03%	1.03%	Added +67.7k	+67,748 40.6%
24	AMBARELLA INC SHS AMBA	AMBA	84,479	$5.6m1.01%	1.01%	Reduced -2.0k	-1,952 -2.3%
25	NEXTERA ENERGY INC COM NEE	NEE	79,535	$5.5m1.00%	1.00%	Reduced -26.7k	-26,656 -25.1%
26	GUIDEWIRE SOFTWARE INC COM GWRE	GWRE	23,265	$5.5m1.00%	1.00%	Reduced -15.6k	-15,566 -40.1%
27	SALESFORCE INC COM CRM	CRM	19,497	$5.3m0.97%	0.97%	Reduced -443	-443 -2.2%
28	AGNICO EAGLE MINES LTD COM AEM	AEM	41,294	$4.9m0.89%	0.89%	Reduced -1.0k	-1,028 -2.4%
29	UNIVERSAL INS HLDGS INC COM UVE	UVE	175,408	$4.9m0.88%	0.88%	Reduced -1.3k	-1,266 -0.7%
30	KINIKSA PHARMACEUTICALS INTL ORD SHS CL A KNSA	KNSA	171,437	$4.7m0.86%	0.86%	Reduced -1.2k	-1,229 -0.7%
31	BLUEPRINT MEDICINES CORP COM BPMC	BPMC	36,291	$4.7m0.85%	0.85%	Reduced -5.2k	-5,234 -12.6%
32	LSI INDS INC OHIO COM LYTS	LYTS	266,221	$4.5m0.82%	0.82%	Reduced -1.9k	-1,924 -0.7%
33	PEGASYSTEMS INC COM PEGA	PEGA	81,973	$4.4m0.81%	0.81%	Added +40.1k	+40,126 95.9%
34	CREXENDO INC COM CXDO	CXDO	721,828	$4.4m0.80%	0.80%	Reduced -5.2k	-5,229 -0.7%
35	PRIMORIS SVCS CORP COM PRIM	PRIM	55,869	$4.4m0.79%	0.79%	Reduced -6.8k	-6,802 -10.8%
36	CECO ENVIRONMENTAL CORP COM CECO	CECO	152,743	$4.3m0.79%	0.79%	Reduced -1.1k	-1,103 -0.7%
37	AMPRIUS TECHNOLOGIES INC COMMON STOCK AMPX	AMPX	1,025,357	$4.3m0.78%	0.78%	Added +89.5k	+89,542 9.6%
38	PATRICK INDS INC COM PATK	PATK	46,055	$4.2m0.77%	0.77%	Reduced -436	-436 -0.9%
39	BWX TECHNOLOGIES INC COM BWXT	BWXT	28,128	$4.1m0.74%	0.74%	Added +6.6k	+6,602 30.7%
40	NUTEX HEALTH INC COM NUTX	NUTX	32,403	$4.0m0.73%	0.73%	Reduced -54.8k	-54,820 -62.9%
41	ZSCALER INC COM ZS	ZS	12,641	$4.0m0.72%	0.72%	Reduced -272	-272 -2.1%
42	BRAINSWAY LTD SPONSORED ADS BWAY	BWAY	300,940	$4.0m0.72%	0.72%	Reduced -2.2k	-2,225 -0.7%
43	SUNOPTA INC COM STKL	STKL	681,702	$4.0m0.72%	0.72%	Reduced -21.4k	-21,438 -3.0%
44	CLEARPOINT NEURO INC COM CLPT	CLPT	325,378	$3.9m0.71%	0.71%	Reduced -2.1k	-2,081 -0.6%
45	SI-BONE INC COM SIBN	SIBN	206,408	$3.9m0.71%	0.71%	Reduced -1.5k	-1,492 -0.7%
46	ONESPAN INC COM OSPN	OSPN	220,306	$3.7m0.67%	0.67%	Reduced -1.6k	-1,593 -0.7%
47	CONCENTRA GROUP HOLDINGS PAR COMMON STOCK CON	CON	178,412	$3.7m0.67%	0.67%	Added +79.3k	+79,285 80.0%
48	GREAT LAKES DREDGE & DOCK CO COM GLDD	GLDD	298,682	$3.6m0.66%	0.66%	Reduced -2.1k	-2,139 -0.7%
49	MRC GLOBAL INC COM MRC	MRC	264,799	$3.6m0.66%	0.66%	Reduced -1.9k	-1,918 -0.7%
50	TENET HEALTHCARE CORP COM NEW THC	THC	20,234	$3.6m0.65%	0.65%	Reduced -3.7k	-3,677 -15.4%
51	OCULAR THERAPEUTIX INC COM OCUL	OCUL	381,595	$3.5m0.64%	0.64%	Reduced -2.7k	-2,730 -0.7%
52	OLO INC CL A OLO	OLO	387,672	$3.5m0.63%	0.63%	Reduced -2.8k	-2,769 -0.7%
53	DOLLAR TREE INC COM DLTR	DLTR	34,483	$3.4m0.62%	0.62%	Added +17.9k	+17,931 108.3%
54	908 DEVICES INC COM MASS	MASS	477,342	$3.4m0.62%	0.62%	Reduced -3.2k	-3,207 -0.7%
55	XERIS BIOPHARMA HOLDINGS INC COM XERS	XERS	725,774	$3.4m0.62%	0.62%	Reduced -4.7k	-4,670 -0.6%
56	BGC GROUP INC CL A BGC	BGC	326,659	$3.3m0.61%	0.61%	Reduced -2.2k	-2,240 -0.7%
57	GRIFFON CORP COM GFF	GFF	45,661	$3.3m0.60%	0.60%	Reduced -313	-313 -0.7%
58	DISNEY WALT CO COM DIS	DIS	26,458	$3.3m0.60%	0.60%	Reduced -1.5k	-1,497 -5.4%
59	STEREOTAXIS INC COM NEW STXS	STXS	1,544,756	$3.3m0.60%	0.60%	Reduced -11.3k	-11,338 -0.7%
60	TRANSCAT INC COM TRNS	TRNS	37,714	$3.2m0.59%	0.59%	Reduced -273	-273 -0.7%
61	ASML HOLDING N V N Y REGISTRY SHS ASML	ASML	4,027	$3.2m0.59%	0.59%	Reduced -172	-172 -4.1%
62	SMART GLOBAL HLDGS INC SHS SHS		162,516	$3.2m0.59%	0.59%	Reduced -1.1k	-1,057 -0.7%
63	GLOBUS MED INC CL A GMED	GMED	54,536	$3.2m0.59%	0.59%	Reduced -1.4k	-1,441 -2.6%
64	ARLO TECHNOLOGIES INC COM ARLO	ARLO	186,716	$3.2m0.58%	0.58%	Reduced -1.3k	-1,282 -0.7%
65	COGNYTE SOFTWARE LTD ORD SHS CGNT	CGNT	340,470	$3.1m0.57%	0.57%	Reduced -2.5k	-2,462 -0.7%
66	COVENANT LOGISTICS GROUP INC CL A CVLG	CVLG	129,895	$3.1m0.57%	0.57%	Added +25.4k	+25,352 24.2%
67	IDEX CORP COM IEX	IEX	17,831	$3.1m0.57%	0.57%	Reduced -3.5k	-3,470 -16.3%
68	RADCOM LTD SHS NEW RDCM	RDCM	225,719	$3.1m0.56%	0.56%	Reduced -1.4k	-1,428 -0.6%
69	PAYMENTUS HOLDINGS INC COM CL A PAY	PAY	91,983	$3.0m0.55%	0.55%	Reduced -54.9k	-54,889 -37.4%
70	INTUIT COM INTU	INTU	3,814	$3.0m0.55%	0.55%	Reduced -69	-69 -1.8%
71	RANGE RES CORP COM RRC	RRC	72,868	$3.0m0.54%	0.54%	Reduced -5.4k	-5,379 -6.9%
72	ENVIRI CORP COM COM		340,846	$3.0m0.54%	0.54%	Reduced -2.5k	-2,463 -0.7%
73	RED VIOLET INC COM RDVT	RDVT	59,202	$2.9m0.53%	0.53%	Reduced -427	-427 -0.7%
74	PHREESIA INC COM PHR	PHR	101,230	$2.9m0.52%	0.52%	Reduced -694	-694 -0.7%
75	EVERCORE INC CLASS A EVR	EVR	10,561	$2.9m0.52%	0.52%	Reduced -73	-73 -0.7%
76	MEDIWOUND LTD SHS NEW MDWD	MDWD	146,808	$2.8m0.52%	0.52%	Reduced -1.1k	-1,060 -0.7%
77	COHU INC COM COHU	COHU	146,733	$2.8m0.51%	0.51%	New
78	MATRIX SVC CO COM MTRX	MTRX	205,496	$2.8m0.50%	0.50%	Reduced -1.5k	-1,489 -0.7%
79	MAMAS CREATIONS INC COM MAMA	MAMA	331,927	$2.8m0.50%	0.50%	New
80	EXTREME NETWORKS COM EXTR	EXTR	153,300	$2.8m0.50%	0.50%	Reduced -969	-969 -0.6%
81	ORION GROUP HLDGS INC COM ORN	ORN	300,287	$2.7m0.50%	0.50%	New
82	BLACKSKY TECHNOLOGY INC CL A NEW BKSY	BKSY	132,217	$2.7m0.49%	0.49%	New
83	POTBELLY CORP COM PBPB	PBPB	220,446	$2.7m0.49%	0.49%	Reduced -1.5k	-1,456 -0.7%
84	ARTERIS INC COM AIP	AIP	282,003	$2.7m0.49%	0.49%	Reduced -2.0k	-2,036 -0.7%
85	ARCUTIS BIOTHERAPEUTICS INC COM ARQT	ARQT	189,511	$2.7m0.48%	0.48%	Reduced -1.1k	-1,127 -0.6%
86	PAYCHEX INC COM PAYX	PAYX	17,886	$2.6m0.47%	0.47%	Reduced -272	-272 -1.5%
87	NOVANTA INC COM NOVT	NOVT	20,111	$2.6m0.47%	0.47%	Reduced -147	-147 -0.7%
88	CERAGON NETWORKS LTD ORD CRNT	CRNT	1,036,139	$2.5m0.46%	0.46%	Reduced -7.3k	-7,277 -0.7%
89	TETRA TECHNOLOGIES INC DEL COM TTI	TTI	751,809	$2.5m0.46%	0.46%	Reduced -5.4k	-5,443 -0.7%
90	ASPEN AEROGELS INC COM ASPN	ASPN	426,528	$2.5m0.46%	0.46%	Added +193.8k	+193,788 83.3%
91	KAMADA LTD SHS KMDA	KMDA	323,832	$2.5m0.46%	0.46%	New
92	BAKER HUGHES COMPANY CL A BKR	BKR	64,952	$2.5m0.45%	0.45%	Reduced -3.6k	-3,563 -5.2%
93	LIQUIDITY SVCS INC COM LQDT	LQDT	104,912	$2.5m0.45%	0.45%	Reduced -757	-757 -0.7%
94	MONTROSE ENVIRONMENTAL GROUP COM ONT	ONT	108,414	$2.4m0.43%	0.43%	Reduced -775	-775 -0.7%
95	LEGALZOOM COM INC COM LZ	LZ	264,801	$2.4m0.43%	0.43%	New
96	EVERUS CONSTR GROUP COM ECG	ECG	36,943	$2.3m0.43%	0.43%	Reduced -231	-231 -0.6%
97	PROCEPT BIOROBOTICS CORP COM PRCT	PRCT	40,298	$2.3m0.42%	0.42%	Reduced -233	-233 -0.6%
98	ANGIODYNAMICS INC COM ANGO	ANGO	230,757	$2.3m0.42%	0.42%	Added +51.6k	+51,567 28.8%
99	SEMTECH CORP COM SMTC	SMTC	49,140	$2.2m0.40%	0.40%	Reduced -357	-357 -0.7%
100	CASTELLUM INC COM NEW CTM	CTM	2,090,500	$2.2m0.40%	0.40%	New

Sold out since Q1 2025

Security	Ticker	Shares held before	Value then
INTRA-CELLULAR THERAPIES INC ITCI	ITCI	49,717	$6.6m49.7k shares
TRAVERE THERAPEUTICS INC TVTX	TVTX	254,666	$4.6m254.7k shares
GENERAC HLDGS INC GNRC	GNRC	30,615	$3.9m30.6k shares
BANK MARIN BANCORP BMRC	BMRC	132,943	$2.9m132.9k shares
PFIZER INC PFE	PFE	114,116	$2.9m114.1k shares
INTERFACE INC TILE	TILE	142,578	$2.8m142.6k shares
TARSUS PHARMACEUTICALS INC TARS	TARS	54,447	$2.8m54.4k shares
REVOLVE GROUP INC RVLV	RVLV	110,322	$2.4m110.3k shares
FRONTDOOR INC FTDR	FTDR	58,703	$2.3m58.7k shares
QUIDELORTHO CORP QDEL	QDEL	63,315	$2.2m63.3k shares
EVOLUS INC EOLS	EOLS	181,134	$2.2m181.1k shares
GRID DYNAMICS HLDGS INC GDYN	GDYN	138,742	$2.2m138.7k shares
NOVOCURE LTD NVCR	NVCR	121,040	$2.2m121.0k shares
PULMONX CORP LUNG	LUNG	303,246	$2.0m303.2k shares
POWERFLEET INC AIOT	AIOT	356,972	$2.0m357.0k shares
FORWARD AIR CORP FWRD	FWRD	76,596	$1.5m76.6k shares
HA SUSTAINABLE INFRA CAP INC HASI	HASI	49,063	$1.4m49.1k shares
HUBBELL INC HUBB	HUBB	3,785	$1.3m3.8k shares
CHART INDS INC GTLS	GTLS	8,578	$1.2m8.6k shares
INTEGRAL AD SCIENCE HLDNG CO IAS	IAS	128,408	$1.0m128.4k shares
BARRICK GOLD CORP		26,925	$523.4k26.9k shares
CAESARSTONE LTD CSTE	CSTE	113,320	$275.4k113.3k shares
INSPIREMD INC NSPR	NSPR	72,565	$195.2k72.6k shares
INTEST CORP INTT	INTT	22,774	$159.2k22.8k shares
NINE ENERGY SERVICE INC NINEQ	NINEQ	126,360	$142.8k126.4k shares