ESSEX INVESTMENT MANAGEMENT CO LLC

Registered adviser

CIK

201772

Location

BOSTON, MA

Portfolio Value

Small $672,785,182

Diversification

Diversified

Filing Date

Global Rank

#2,993 / 8,818 ▲ 97 · as of Jun 2026

Top Industry

Biotechnology 10.7%

Period ended 28 days ago

Filed Oct 19, 2026 · 9d

27 quarters · since Mar 2020

Regulatory profile

From Form ADV, the SEC filer profile, 13D/13G type codes and N-CEN, never from the name.

Holder type

Registered adviser

Form ADV roster, Oct 1, 2026

Form ADV adviser

CRD 109962

Roster of Oct 1, 2026

Regulatory AUM

$712,676,443

Main clients

Diversified

LEI

5493006L0QZW93PSTY37

Private funds on Schedule D 7.B.(1)

As filed Apr 24, 2024; SEC's bulk Form ADV archive ends with 2024 filings.

$21,120,079 gross assets in 2 funds Hedge funds $21,120,079 (2)

Form ADV history

Monthly rosters from Dec 2019; each row is a run with the same figures, newest first.

Rosters	Regulatory AUM	Main clients
Apr 2026 to Oct 2026	$712,676,443	Diversified
Apr 2025 to Mar 2026	$610,160,466	Diversified
Apr 2024 to Mar 2025	$627,115,345	Diversified
May 2023 to Mar 2024	$627,059,695	Diversified
Apr 2023	$627,059,695	Diversified
Apr 2022 to Mar 2023	$845,341,141	Diversified

3 earlier changes not shown.

Portfolio style

Measured from the filed 13F common-share book for Jun 30, 2026, the newest measured quarter, never from the firm's own description.

Style

Diversified active

Top 10 weight 20.2%, 100.0 effective positions, active share 91.5% against every 13F filer's combined book; it meets none of the index-like, systematic-like or concentrated tests

Turnover

Medium turnover

44.8% over the last four quarters (30% to under 100%)

Horizon

Horizon unknown

The value-weighted holding period is at least 11.3 quarters, but 20.4% of the book was already held when coverage starts

Closest benchmark: every 13F filer's combined book, active share 91.5%; sector active share 31.5% against the combined 13F book's sector weights.

Over time 26 measured quarters

How the bands are measured

Style bands measure the filed 13F common-share book each closed quarter, tested in this order. Unknown: under $10,000,000 of valued equity or 5 stocks. Index-like (100+ stocks): active share of 20% or less against the closest benchmark, which is the S&P 500, S&P MidCap 400, S&P SmallCap 600, Russell 1000, Russell 2000, Nasdaq-100 or Dow Jones Industrial Average (weighted by an index-tracking fund's reported holdings or the index's constituents nearest the quarter end, over the names resolved to companies, and only when those are 90%+ of its weight) or every 13F filer's combined book, or index series holding 80%+ of the registered fund assets it advises (N-CEN) and equal to 50%+ of its book. Systematic-like: 500+ stocks, 100%+ annual turnover and a top 10 weight of 25% or less. Concentrated: a top 10 weight of 60%+ or 12 or fewer effective positions. Diversified active: none of these. Turnover is the smaller of buys and sells over average equity value, summed over four quarters: low under 30%, high 100%+. Horizon is the value-weighted number of quarters each position has been held: short under 4, long 12+.

Clone Performance

Build a hypothetical price-return history from this filer's public 13F holdings.

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Portfolio Concentration

298 tracked positions · as of Sep 30, 2026 · Δ vs Jun 30, 2026

Top Position

3.1%

−0.5 pts

Top 5

10.4%

−1.2 pts

Top 10

17.2%

−2.9 pts

HHI

Diversified−10

Portfolio Trend

27 quarters · across all stocks

Sector Breakdown

As of Sep 30, 2026

Sector	% Portfolio	Value	Positions
Technology	29.2%	$196,339,917	81
Healthcare	24.9%	$167,390,876	48
Industrials	24.2%	$162,824,515	70
Consumer Cyclical	5.6%	$37,887,968	16
Financial Services	5.6%	$37,704,565	15
Energy	4.0%	$27,056,393	18
Consumer Defensive	3.4%	$23,097,227	14
Basic Materials	1.9%	$12,968,208	19
Communication Services	0.5%	$3,638,391	5
Utilities	0.4%	$2,383,084	8
Unclassified	0.2%	$1,494,038	4

Last Quarter's Activity

Export CSV

Sep 30, 2026 vs Jun 30, 2026

Added To

Positions the filer increased

18 positions

Ticker	Company	Δ Shares	Shares	Value
NUVB	Nuvation Bio Inc.	+673,830	1,344,871	$7,531,277
FOCL	Edap Tms SA	+361,641	507,646	$2,269,177
LTRX	Lantronix Inc	+227,913	889,983	$6,416,777
ESOA	Energy Services of America CORP	+216,049	242,102	$2,699,437
TNXP	Tonix Pharmaceuticals Holding Corp.	+127,253	292,397	$2,847,946
REAL	TheRealReal, Inc.	+79,861	310,518	$2,744,979
THRM	Gentherm Inc	+50,273	158,243	$5,269,491
CPSH	Cps Technologies Corp	+32,800	54,324	$203,171
APT	Alpha Pro Tech Ltd	+13,019	47,283	$242,088
MWH	SOLV Energy, Inc.	+12,458	42,894	$1,030,313
SEDG	Solaredge Technologies, Inc.	+12,173	24,206	$771,445
WTS	Watts Water Technologies Inc	+11,980	11,985	$4,244,847
CRWD	CrowdStrike Holdings, Inc.	+11,848	16,017	$4,240,500
NOVT	Novanta Inc	+9,885	29,696	$4,222,474
VLTO	Veralto Corp	+7,939	15,042	$1,418,761
OESX	Orion Energy Systems, Inc.	+1,481	22,089	$673,714
ATMU	Atmus Filtration Technologies Inc.	+399	1,112	$48,283
APH	Amphenol Corp	+168	336	$28,324
No positions match the current search.

Trimmed

Positions the filer reduced

25 positions

Ticker	Company	Δ Shares	Shares	Value
CURI	CuriosityStream Inc.	−179,023	416,034	$1,210,658
OUST	Ouster, Inc.	−73,103	152,925	$6,168,994
ADPT	Adaptive Biotechnologies Corp	−71,028	401,735	$11,610,141
LINC	Lincoln Educational Services Corp	−62,161	278,205	$6,084,343
KNSA	Kiniksa Pharmaceuticals International, plc	−39,361	202,021	$15,072,786
APYX	Apyx Medical Corp	−34,752	1,101,878	$2,699,601
PAY	Paymentus Holdings, Inc.	−30,441	60,141	$1,842,720
CRGO	Freightos Ltd	−29,362	925,924	$879,905
III	Information Services Group Inc.	−24,709	783,636	$4,333,507
RSKD	Riskified Ltd.	−23,464	745,621	$5,897,862
TTI	Tetra Technologies Inc	−23,076	717,931	$4,214,254
PGEN	Precigen, Inc.	−22,875	683,419	$5,850,066
XERS	Xeris Biopharma Holdings, Inc.	−22,348	693,260	$6,627,565
SOPH	SOPHiA GENETICS SA	−20,299	643,129	$5,389,421
AVPT	AvePoint, Inc.	−19,554	551,987	$7,771,976
RDVT	Red Violet, Inc.	−18,823	63,732	$5,035,465
GHM	Graham Corp	−18,186	75,219	$6,492,151
BWAY	Brainsway Ltd.	−17,788	574,818	$7,587,597
AMSC	American Superconductor Corp	−16,551	205,382	$5,978,670
NVCR	NovoCure Ltd	−15,515	424,133	$6,764,921
OCUL	Ocular Therapeutix, Inc	−14,829	467,325	$3,584,382
TRMB	Trimble Inc.	−14,714	33,366	$1,905,532
MASS	908 Devices Inc.	−14,538	455,706	$5,623,412
TSEM	Tower Semiconductor Ltd	−14,024	91,519	$20,814,166
ORN	Orion Group Holdings Inc	−13,600	429,003	$3,667,975
No positions match the current search.

New Positions

Positions the filer opened this quarter

18 positions

Ticker	Company	Shares	Value
ACOG	Alpha Cognition Inc.	422,858	$3,805,722
NVDA	Nvidia Corp	16,210	$3,702,039
LGIH	LGI Homes, Inc.	78,553	$3,663,711
IA	Innovative Solutions & Support Inc	184,874	$3,433,110
FENC	Fennec Pharmaceuticals Inc.	318,771	$3,394,911
OCFC	Oceanfirst Financial Corp	198,887	$3,287,602
KRNT	Kornit Digital Ltd.	142,299	$2,365,009
NNBR	Nn Inc	643,675	$2,362,287
KBR	Kbr, Inc.	52,944	$1,861,511
DE	Deere & Co	1,186	$796,458
SYM	Symbotic Inc.	17,700	$744,639
CBRS	Cerebras Systems Inc.	1,999	$355,122
AXIL	Axil Brands, Inc.	39,605	$239,214
BOSC	Bos Better Online Solutions Ltd	43,855	$203,048
SCWO	374Water Inc.	63,303	$183,578
TWST	Twist Bioscience Corp	502	$97,006
HNGE	Hinge Health, Inc.	536	$52,120
CRSP	CRISPR Therapeutics AG	877	$48,515
No positions match the current search.

Sold Out

Positions the filer fully exited

22 positions

Ticker	Company	Shares	Value
CXDO	Crexendo, Inc.	710,874	$5,310,228
OSG	Octave Specialty Group Inc	539,289	$3,365,163
BRCC	BRC Inc.	2,624,990	$2,913,738
STXS	Stereotaxis, Inc.	1,521,966	$2,617,781
DIS	Walt Disney Co	22,666	$2,181,602
BLND	Blend Labs, Inc.	1,254,746	$2,145,615
IDN	Intellicheck, Inc.	488,164	$2,001,472
PEGA	Pegasystems Inc	65,597	$1,965,942
INVE	INVE Technologies, Inc.	484,438	$1,220,783
UPWK	Upwork, Inc	131,938	$1,103,001
SHLS	Shoals Technologies Group, Inc.	93,670	$927,333
ENPH	Enphase Energy, Inc.	17,724	$872,729
RPID	Rapid Micro Biosystems, Inc.	362,696	$627,464
OPXS	Optex Systems Holdings Inc	23,090	$323,952
ALAR	Alarum Technologies Ltd.	27,747	$223,085
LVO	LiveOne, Inc.	24,494	$156,761
NMTC	NEUROONE MEDICAL TECHNOLOGIES Corp	43,578	$132,477
CSBR	Champions Oncology, Inc.	18,221	$112,241
MS	Morgan Stanley	363	$75,881
OPTT	Ocean Power Technologies, Inc.	204,864	$53,264
PPLI	People Inc	486	$22,433
TRIP	TripAdvisor, Inc.	1,523	$20,880
No positions match the current search.

Portfolio Positions

Compact Export CSV View 13F filing

298 tracked positions · $672,785,182 total · filing declares 301 positions · $674,703,164 · as of Sep 30, 2026

All sectors Basic Materials Communication Services Consumer Cyclical Consumer Defensive Energy Financial Services Healthcare Industrials Technology Utilities

Showing 1–50 of 298 positions by value · page 1 of 6

Ticker	Company	Type	Shares	Δ Shares	Value (USD)	% Δ Value	% of Portfolio
TSEM	Tower Semiconductor Ltd Technology	Reduced	91,519	-14,024	$20,814,166	−24.3%	3.09%
KNSA	Kiniksa Pharmaceuticals International, plc Healthcare	Reduced	202,021	-39,361	$15,072,786	−2.4%	2.24%
LGND	Ligand Pharmaceuticals Inc Healthcare	Reduced	38,917	-4,650	$12,156,503	−11.7%	1.81%
ADPT	Adaptive Biotechnologies Corp Healthcare	Reduced	401,735	-71,028	$11,610,141	+14.5%	1.73%
AAPL	Apple Inc. Technology	Reduced	31,084	-1,343	$10,351,593	+10.3%	1.54%
CECO	Ceco Environmental Corp Industrials	Reduced	145,717	-4,699	$10,147,731	−25.7%	1.51%
HCI	HCI Group, Inc. Financial Services	Reduced	54,282	-1,978	$9,435,297	−4.3%	1.40%
DRS	Leonardo DRS, Inc. Industrials	Reduced	242,479	-7,736	$8,882,005	−16.8%	1.32%
MIRM	Mirum Pharmaceuticals, Inc. Healthcare	Reduced	101,716	-3,953	$8,694,683	−29.7%	1.29%
COHU	Cohu Inc Technology	Reduced	127,180	-3,990	$8,666,045	−10.6%	1.29%
AVPT	AvePoint, Inc. Technology	Reduced	551,987	-19,554	$7,771,976	+21.3%	1.16%
STRL	Sterling Infrastructure, Inc. Industrials	Reduced	15,536	-619	$7,640,294	−43.7%	1.14%
TVTX	Travere Therapeutics, Inc. Healthcare	Reduced	129,493	-4,373	$7,624,547	+0.3%	1.13%
BWAY	Brainsway Ltd. Healthcare	Reduced	574,818	-17,788	$7,587,597	−17.4%	1.13%
GEV	GE Vernova Inc. Industrials	Reduced	7,978	-305	$7,583,009	−22.1%	1.13%
NUVB	Nuvation Bio Inc. Healthcare	Added	1,344,871	+673,830	$7,531,277	+97.6%	1.12%
WERN	Werner Enterprises Inc Industrials	Reduced	220,515	-11,110	$7,493,099	−25.8%	1.11%
MSFT	Microsoft Corp Technology	Reduced	14,469	-1,245	$7,421,150	+26.6%	1.10%
FEIM	Frequency Electronics Inc Technology	Reduced	86,267	-2,776	$7,292,149	+23.4%	1.08%
BDSX	Biodesix Inc Healthcare	Reduced	234,542	-7,373	$6,996,387	+28.3%	1.04%
AEM	Agnico Eagle Mines Ltd Basic Materials	Reduced	37,195	-1,267	$6,816,727	+14.2%	1.01%
NVCR	NovoCure Ltd Healthcare	Reduced	424,133	-15,515	$6,764,921	+1.6%	1.01%
XERS	Xeris Biopharma Holdings, Inc. Healthcare	Reduced	693,260	-22,348	$6,627,565	+16.9%	0.99%
SMTC	Semtech Corp Technology	Reduced	37,026	-1,200	$6,603,587	+6.7%	0.98%
MRVL	Marvell Technology, Inc. Technology	Reduced	24,845	-1,066	$6,564,297	−15.0%	0.98%
GHM	Graham Corp Industrials	Reduced	75,219	-18,186	$6,492,151	−43.9%	0.96%
AMZN	Amazon Com Inc Consumer Cyclical	Reduced	25,879	-1,183	$6,447,752	−0.0%	0.96%
LTRX	Lantronix Inc Technology	Added	889,983	+227,913	$6,416,777	+64.8%	0.95%
OII	Oceaneering International Inc Energy	Reduced	146,483	-4,980	$6,391,053	+4.1%	0.95%
GS	Goldman Sachs Group Inc Financial Services	Reduced	7,069	-444	$6,364,644	−16.2%	0.95%
AIP	Arteris, Inc. Technology	Reduced	268,987	-8,678	$6,358,852	−52.9%	0.95%
KTOS	Kratos Defense & Security Solutions, Inc. Industrials	Reduced	148,246	-5,330	$6,328,621	−17.4%	0.94%
OUST	Ouster, Inc. Technology	Reduced	152,925	-73,103	$6,168,994	−56.3%	0.92%
ASML	Asml Holding NV Technology	Reduced	3,394	-144	$6,148,807	−12.6%	0.91%
LINC	Lincoln Educational Services Corp Consumer Defensive	Reduced	278,205	-62,161	$6,084,343	−64.2%	0.90%
AMSC	American Superconductor Corp Industrials	Reduced	205,382	-16,551	$5,978,670	−35.1%	0.89%
BXC	BlueLinx Holdings Inc. Industrials	Reduced	83,955	-2,638	$5,971,719	+11.4%	0.89%
LYTS	Lsi Industries Inc Technology	Reduced	287,681	-8,139	$5,969,380	−24.1%	0.89%
RSKD	Riskified Ltd. Technology	Reduced	745,621	-23,464	$5,897,862	+52.2%	0.88%
PGEN	Precigen, Inc. Healthcare	Reduced	683,419	-22,875	$5,850,066	+45.3%	0.87%
AGX	Argan Inc Industrials	Reduced	15,016	-451	$5,675,297	−54.1%	0.84%
MASS	908 Devices Inc. Healthcare	Reduced	455,706	-14,538	$5,623,412	+37.5%	0.84%
XMTR	Xometry, Inc. Industrials	Reduced	54,162	-1,757	$5,570,561	+3.2%	0.83%
SOPH	SOPHiA GENETICS SA Healthcare	Reduced	643,129	-20,299	$5,389,421	+40.8%	0.80%
AMBA	Ambarella Inc Technology	Reduced	77,245	-2,752	$5,369,299	−21.8%	0.80%
WLDN	Willdan Group, Inc. Industrials	Reduced	72,557	-2,333	$5,360,511	−9.5%	0.80%
PATK	Patrick Industries Inc Consumer Cyclical	Reduced	78,964	-3,996	$5,352,179	−28.1%	0.80%
THRM	Gentherm Inc Consumer Cyclical	Added	158,243	+50,273	$5,269,491	+43.1%	0.78%
MG	Mistras Group, Inc. Industrials	Reduced	249,209	-7,918	$5,248,341	+16.8%	0.78%
FET	Forum Energy Technologies, Inc. Energy	Reduced	64,563	-2,048	$5,226,374	+56.2%	0.78%

Showing the top 50 of 298 positions. Create a free account to see every position, past quarters, search, filters and CSV export.

Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.