Essex Investment Management Co LLC Top Holdings and 13F Report (2026) About Essex Investment Management Co LLCInvestment ActivityEssex Investment Management Co LLC has $674.70 million in total holdings as of September 30, 2026.Essex Investment Management Co LLC owns shares of 301 different stocks, but just 92 companies or ETFs make up 80% of its holdings.Approximately 8.39% of the portfolio was purchased this quarter.About 10.96% of the portfolio was sold this quarter.This quarter, Essex Investment Management Co LLC has purchased 306 new stocks and bought additional shares in 18 stocks.Essex Investment Management Co LLC sold shares of 142 stocks and completely divested from 26 stocks this quarter.Largest Holdings Tower Semiconductor $20,814,166KINIKSA PHARMACEUTICALS INTL P $15,072,787Ligand Pharmaceuticals $12,156,503Adaptive Biotechnologies $11,610,142Apple $10,351,594 Largest New Holdings this Quarter 02074J501 - ALPHA COGNITION INC $3,805,722 Holding67066G104 - NVIDIA $3,702,040 Holding50187T106 - LGI Homes $3,663,712 Holding45769N105 - Innovative Solutions and Support $3,433,110 Holding31447P100 - Adherex Technologies $3,394,911 Holding Largest Purchases this Quarter Watts Water Technologies 11,980 shares (about $4.24M)ALPHA COGNITION INC 422,858 shares (about $3.81M)Nuvation Bio 673,830 shares (about $3.77M)NVIDIA 16,210 shares (about $3.70M)LGI Homes 78,553 shares (about $3.66M) Largest Sales this Quarter Tower Semiconductor 14,024 shares (about $3.19M)OUSTER INC 73,103 shares (about $2.95M)KINIKSA PHARMACEUTICALS INTL P 39,361 shares (about $2.94M)Adaptive Biotechnologies 71,028 shares (about $2.05M)iShares Russell 2000 Growth ETF 4,458 shares (about $1.59M) Sector Allocation Over TimeMap of 500 Largest Holdings ofEssex Investment Management Co LLC Selling Neutral Buying Latest 13F Holdings and Changes Since Previous Quarterly FilingIssuer NameHoldings ValueApproximate Purchase/SaleChange in SharesShares Held% of PortfolioSectorTSEMTower Semiconductor$20,814,166$3,189,478 ▼-13.3%91,5193.1%TechnologyKINIKSA PHARMACEUTICALS INTL P$15,072,787$2,936,724 ▼-16.3%202,0212.2%COMLGNDLigand Pharmaceuticals$12,156,503$1,452,520 ▼-10.7%38,9171.8%HealthcareADPTAdaptive Biotechnologies$11,610,142$2,052,709 ▼-15.0%401,7351.7%HealthcareAAPLApple$10,351,594$447,246 ▼-4.1%31,0841.5%TechnologyCECOCECO Environmental$10,147,732$327,238 ▼-3.1%145,7171.5%IndustrialsHCIHCI Group$9,435,297$343,816 ▼-3.5%54,2821.4%FinanceDRSLeonardo DRS$8,882,006$283,370 ▼-3.1%242,4791.3%IndustrialsMIRMMirum Pharmaceuticals$8,694,684$337,902 ▼-3.7%101,7161.3%HealthcareCOHUCohu$8,666,045$271,879 ▼-3.0%127,1801.3%TechnologyAVPTAvePoint$7,771,977$275,320 ▼-3.4%551,9871.2%TechnologySTRLSterling Infrastructure$7,640,294$304,412 ▼-3.8%15,5361.1%IndustrialsTVTXTravere Therapeutics$7,624,548$257,482 ▼-3.3%129,4931.1%HealthcareBWAYBrainsway$7,587,598$234,802 ▼-3.0%574,8181.1%HealthcareGE VERNOVA INC$7,583,009$289,899 ▼-3.7%7,9781.1%COMNUVBNuvation Bio$7,531,278$3,773,448 ▲100.4%1,344,8711.1%HealthcareWERNWerner Enterprises$7,493,100$377,518 ▼-4.8%220,5151.1%IndustrialsMSFTMicrosoft$7,421,150$638,560 ▼-7.9%14,4691.1%TechnologyFEIMFrequency Electronics$7,292,150$234,655 ▼-3.1%86,2671.1%TechnologyBIODESIX INC$6,996,388$219,937 ▼-3.0%234,5421.0%COMAEMAgnico Eagle Mines$6,816,728$232,203 ▼-3.3%37,1951.0%MaterialsNVCRNovoCure$6,764,921$247,464 ▼-3.5%424,1331.0%HealthcareXERSXeris Biopharma$6,627,566$213,647 ▼-3.1%693,2601.0%HealthcareSMTCSemtech$6,603,587$214,020 ▼-3.1%37,0261.0%TechnologyMRVLMarvell Technology$6,564,297$281,648 ▼-4.1%24,8451.0%TechnologyGHMGraham$6,492,152$1,569,634 ▼-19.5%75,2191.0%IndustrialsAMZNAmazon.com$6,447,753$294,744 ▼-4.4%25,8791.0%Consumer DiscretionaryLTRXLantronix$6,416,777$1,643,253 ▲34.4%889,9831.0%TechnologyOIIOceaneering International$6,391,053$217,277 ▼-3.3%146,4830.9%EnergyGSThe Goldman Sachs Group$6,364,645$399,760 ▼-5.9%7,0690.9%FinanceAIPArteris$6,358,853$205,148 ▼-3.1%268,9870.9%TechnologyKTOSKratos Defense & Security Solutions$6,328,622$227,538 ▼-3.5%148,2460.9%IndustrialsOUSTER INC$6,168,995$2,948,975 ▼-32.3%152,9250.9%COMASMLASML$6,148,808$260,880 ▼-4.1%3,3940.9%TechnologyLINCLincoln Educational Services$6,084,343$1,359,461 ▼-18.3%278,2050.9%Consumer DiscretionaryAMSCAmerican Superconductor$5,978,670$481,800 ▼-7.5%205,3820.9%IndustrialsBXCBlueLinx$5,971,719$187,641 ▼-3.0%83,9550.9%IndustrialsLYTSLSI Industries$5,969,381$168,884 ▼-2.8%287,6810.9%IndustrialsRSKDRiskified$5,897,862$185,600 ▼-3.1%745,6210.9%TechnologyPGENPrecigen$5,850,067$195,810 ▼-3.2%683,4190.9%HealthcareAGXArgan$5,675,297$170,455 ▼-2.9%15,0160.8%IndustrialsMASS908 Devices$5,623,412$179,399 ▼-3.1%455,7060.8%TechnologyXMTRXometry$5,570,562$180,707 ▼-3.1%54,1620.8%IndustrialsSOPHSOPHiA GENETICS$5,389,421$170,106 ▼-3.1%643,1290.8%HealthcareAMBAAmbarella$5,369,300$191,292 ▼-3.4%77,2450.8%TechnologyWLDNWilldan Group$5,360,511$172,362 ▼-3.1%72,5570.8%IndustrialsPATKPatrick Industries$5,352,180$270,849 ▼-4.8%78,9640.8%Consumer DiscretionaryTHRMGentherm$5,269,492$1,674,091 ▲46.6%158,2430.8%Consumer DiscretionaryMGMistras Group$5,248,342$166,753 ▼-3.1%249,2090.8%IndustrialsFETForum Energy Technologies$5,226,375$165,786 ▼-3.1%64,5630.8%EnergyRDVTRed Violet$5,035,465$1,487,205 ▼-22.8%63,7320.7%IndustrialsWMSAdvanced Drainage Systems$4,967,032$153,699 ▼-3.0%39,2000.7%IndustrialsSIBNSiBone$4,946,299$156,096 ▼-3.1%263,1010.7%HealthcareCONCENTRA GROUP HOLDINGS PAREN$4,889,877$233,058 ▼-4.5%142,0650.7%COMJAZZJazz Pharmaceuticals$4,820,015$195,866 ▼-3.9%20,8190.7%HealthcareINSMInsmed$4,733,500$173,493 ▼-3.5%41,4710.7%HealthcareDIODDiodes$4,378,876$144,314 ▼-3.2%45,2410.6%TechnologyMITKMitek Systems$4,362,294$137,423 ▼-3.1%255,8530.6%TechnologyIIIInformation Services Group$4,333,507$136,641 ▼-3.1%783,6360.6%TechnologyCMCOColumbus McKinnon$4,298,249$135,325 ▼-3.1%269,8210.6%IndustrialsLQDTLiquidity Services$4,286,169$138,255 ▼-3.1%100,0740.6%IndustrialsWTSWatts Water Technologies$4,244,847$4,243,076 ▲239,600.0%11,9850.6%IndustrialsCRWDCrowdStrike$4,240,501$3,136,758 ▲284.2%16,0170.6%TechnologyNOVTNovanta$4,222,474$1,405,548 ▲49.9%29,6960.6%TechnologyTTITetra Technologies$4,214,255$135,456 ▼-3.1%717,9310.6%EnergyAMERANT BANCORP INC$4,174,151$133,115 ▼-3.1%145,5930.6%COMEVERUS CONSTR GROUP$4,134,589$140,436 ▼-3.3%35,1820.6%COMPKEPark Aerospace$4,132,492$132,863 ▼-3.1%139,1880.6%IndustrialsIBEXIBEX$4,115,021$131,208 ▼-3.1%95,1230.6%IndustrialsTILEInterface$4,107,910$137,084 ▼-3.2%119,4160.6%IndustrialsMAMAMama's Creations$4,082,830$131,401 ▼-3.1%316,7440.6%Consumer StaplesGFFGriffon$4,043,518$137,420 ▼-3.3%43,4600.6%IndustrialsMIRMirion Technologies$4,029,241$137,006 ▼-3.3%285,3570.6%TechnologyEVERPURE INC$4,027,109$208,202 ▼-4.9%30,7930.6%COMJOUTJohnson Outdoors$3,985,682$125,101 ▼-3.0%91,3100.6%Consumer DiscretionaryALPHA COGNITION INC$3,805,722$3,805,722 ▲New Holding422,8580.6%COMEXZEO GROUP INC$3,707,634$180,513 ▼-4.6%256,2290.5%COMNVDANVIDIA$3,702,040$3,702,040 ▲New Holding16,2100.5%TechnologyGMEDGlobus Medical$3,692,795$28,013 ▼-0.8%49,3030.5%HealthcareDCBODocebo$3,690,051$115,388 ▼-3.0%160,0890.5%TechnologyORNOrion Group$3,667,976$116,280 ▼-3.1%429,0030.5%IndustrialsLGIHLGI Homes$3,663,712$3,663,712 ▲New Holding78,5530.5%Consumer DiscretionaryDAKTDaktronics$3,649,709$113,974 ▼-3.0%209,8740.5%TechnologyZETA GLOBAL HOLDINGS CORP$3,593,582$122,144 ▼-3.3%113,8290.5%COMBGC GROUP INC$3,584,908$121,803 ▼-3.3%310,9200.5%COMOCULOcular Therapeutix$3,584,383$113,738 ▼-3.1%467,3250.5%HealthcareARQTArcutis Biotherapeutics$3,513,181$120,944 ▼-3.3%132,9240.5%HealthcareISSCInnovative Solutions and Support$3,433,110$3,433,110 ▲New Holding184,8740.5%IndustrialsFENCAdherex Technologies$3,394,911$3,394,911 ▲New Holding318,7710.5%HealthcareBMIBadger Meter$3,390,679$73,506 ▼-2.1%27,4460.5%TechnologyCODACoda Octopus Group$3,353,479$104,564 ▼-3.0%312,5330.5%IndustrialsBWXTBWX Technologies$3,352,801$131,246 ▼-3.8%24,4730.5%IndustrialsOCFCOceanFirst Financial$3,287,602$3,287,602 ▲New Holding198,8870.5%FinanceDLTRDollar Tree$3,234,405$124,054 ▼-3.7%28,3670.5%Consumer StaplesLEGACY ED INC$3,103,973$86,102 ▼-2.7%320,9900.5%COMSFMSprouts Farmers Market$3,040,821$620,107 ▼-16.9%45,8300.5%Consumer StaplesGWREGuidewire Software$2,885,391$115,490 ▼-3.8%20,2370.4%TechnologyAXSMAxsome Therapeutics$2,879,434$115,797 ▼-3.9%15,6160.4%HealthcareLPTHLightPath Technologies$2,856,788$82,099 ▼-2.8%277,0890.4%TechnologyBKRBaker Hughes$2,855,898$129,290 ▼-4.3%52,0200.4%EnergyShowing largest 100 holdings. 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