Essex Investment Management Co. LLC
In its 13F for Q3 2024 (holdings as of September 30, 2024, filed October 10, 2024), Essex Investment Management Co. LLC reported 302 stock positions worth $573.7 million. Its top holding was American Superconductor (AMSC) at 1.9% of the portfolio, followed by Leonardo DRS (DRS, 1.8%) and Apple (AAPL, 1.7%). Compared with Q2 2024, it opened 30 new positions, sold out of 30, added to 74 and reduced 75. The biggest buy was a new position in Pfizer (PFE) and the biggest sale an exit from Dynavax Technologies (DVAX).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0000201772
- Portfolio Value
- $573.7M (Q3 2024)
- SEC Filing
- 0000201772-24-000006 ↗ filed Oct 10, 2024
Holdings Value
Holdings 302 stocks · $573.7M
| AMSC American Superconductor Corp. | 1.91% | 464,506 | $11.0M | Reduce -19.6% |
| DRS Leonardo DRS Inc. | 1.85% | 375,242 | $10.6M | Add +0.3% |
| AAPL Apple Inc. | 1.72% | 42,234 | $9.8M | Reduce -23.4% |
| HCI Hci Group Inc. | 1.65% | 88,579 | $9.5M | Reduce -2.2% |
| NEE Nextera Energy Inc. | 1.64% | 111,101 | $9.4M | Reduce -8.9% |
| KTOS Kratos Defense & Security | 1.63% | 402,531 | $9.4M | Reduce -1.3% |
| ZETA Zeta Global Holdings Corp. Class A | 1.59% | 306,305 | $9.1M | Add +0.3% |
| MSFT Microsoft Corp. | 1.58% | 21,126 | $9.1M | Reduce -7.8% |
| PRIM Primoris Services Corp. | 1.51% | 149,043 | $8.7M | Reduce -3.5% |
| GWRE Guidewire Software Inc. | 1.44% | 45,264 | $8.3M | Reduce -4.2% |
| TSEM Tower Semiconductor Ltd. | 1.39% | 179,579 | $7.9M | Add +7.5% |
| AVPT Avepoint Inc. | 1.22% | 592,511 | $7.0M | Reduce -1.9% |
| LGND Ligand Pharmaceuticals | 1.21% | 69,148 | $6.9M | Reduce -2.3% |
| XYL Xylem Inc. | 1.15% | 48,824 | $6.6M | Reduce -0.8% |
| STRL Sterling Infrastructure Inc. | 1.14% | 44,975 | $6.5M | Reduce -20.9% |
| PRCT Procept Biorobotics Corp. | 1.13% | 80,992 | $6.5M | Add +0.3% |
| MYGN Myriad Genetics Inc. | 1.13% | 235,841 | $6.5M | Reduce -1.8% |
| THC Tenet Healthcare Corp. | 1.11% | 38,388 | $6.4M | Reduce -27.3% |
| WLDN Willdan Group Inc. | 1.11% | 155,761 | $6.4M | Add +0.3% |
| AMZN Amazon.com Inc. | 1.10% | 34,022 | $6.3M | Reduce -4.3% |
| CRM Salesforce Inc. | 1.07% | 22,452 | $6.1M | Reduce -5.4% |
| ASPN Aspen Aerogels Inc. | 1.04% | 215,767 | $6.0M | Reduce -26.9% |
| CECO Ceco Environmental Corp. | 1.02% | 208,426 | $5.9M | Add +0.3% |
| INSM Insmed Inc. | 0.98% | 77,193 | $5.6M | Reduce -25.2% |
| GHM Graham Corp. | 0.98% | 190,253 | $5.6M | Add +0.3% |
| GNRC Generac Holdings Inc. | 0.97% | 34,940 | $5.6M | Reduce -3.4% |
| LINC Lincoln Educational Services | 0.92% | 443,739 | $5.3M | Add +0.3% |
| TRNS Transcat Inc. | 0.91% | 43,444 | $5.2M | Add +0.4% |
| CLPT Clearpoint Neuro Inc. | 0.91% | 463,853 | $5.2M | Add +0.3% |
| STKL Sunopta Inc. | 0.90% | 811,188 | $5.2M | Reduce -4.5% |
| PATK Patrick Industries Inc. | 0.89% | 36,043 | $5.1M | Reduce -28.3% |
| AGX Argan Inc. | 0.88% | 49,578 | $5.0M | Reduce -12.7% |
| KNSA Kiniksa Pharmaceuticals Inte | 0.87% | 200,516 | $5.0M | Add +0.4% |
| LYTS Lsi Industries Inc. | 0.86% | 306,397 | $4.9M | Add +0.4% |
| AMBA Ambarella Inc. | 0.84% | 85,424 | $4.8M | Reduce -2.1% |
| SEM Select Medical Holdings Corp. | 0.84% | 137,449 | $4.8M | Reduce -4.0% |
| EOLS Evolus Inc. | 0.83% | 295,553 | $4.8M | Add +0.4% |
| BP BP PLC-Spons ADR | 0.83% | 150,815 | $4.7M | Reduce -4.0% |
| GMED Globus Medical Inc. Class A | 0.82% | 65,986 | $4.7M | Reduce -5.6% |
| GS Goldman Sachs Group Inc. | 0.82% | 9,484 | $4.7M | Reduce -7.4% |
| EVER Everquote Inc. Class A | 0.80% | 216,694 | $4.6M | Add +16.5% |
| UVE Universal Insurance Holdings | 0.78% | 201,639 | $4.5M | Add +64.6% |
| PFE Pfizer Inc. | 0.76% | 150,992 | $4.4M | New |
| ITCI Intra-Cellular Therapies Inc. | 0.74% | 58,385 | $4.3M | Add +85.7% |
| OSPN Onespan Inc. | 0.74% | 256,029 | $4.3M | Add +0.3% |
| PAY Paymentus Holdings Inc. Class A | 0.73% | 210,184 | $4.2M | Add +0.2% |
| NOVT Novanta Inc. | 0.73% | 23,379 | $4.2M | Add +0.3% |
| ERII Energy Recovery Inc. | 0.72% | 237,426 | $4.1M | Reduce -3.0% |
| NVRI Enviri Corp. | 0.70% | 388,870 | $4.0M | Add +0.3% |
| SG Sweetgreen Inc. Class A | 0.70% | 112,647 | $4.0M | Add +0.3% |
| MIR Mirion Technologies Inc. | 0.68% | 351,478 | $3.9M | Add +0.3% |
| OCUL Ocular Therapeutix Inc. | 0.67% | 443,677 | $3.9M | Add +0.3% |
| CXDO Crexendo Inc. | 0.67% | 828,759 | $3.8M | Add +1473.9% |
| MRC MRC Global Inc. | 0.67% | 300,195 | $3.8M | Add +0.4% |
| AEM Agnico Eagle Mines Ltd. | 0.65% | 46,437 | $3.7M | Reduce -5.1% |
| GFF Griffon Corp. | 0.65% | 52,861 | $3.7M | Add +0.3% |
| ADPT Adaptive Biotechnologies | 0.64% | 718,656 | $3.7M | Add +15.2% |
| GLDD Great Lakes Dredge & Dock Co. | 0.64% | 347,517 | $3.7M | Add +0.3% |
| MYO Myomo Inc. | 0.63% | 899,135 | $3.6M | Add +40.2% |
| TARS Tarsus Pharmaceuticals Inc. | 0.63% | 109,156 | $3.6M | New |
| DCBO Docebo Inc. | 0.63% | 81,176 | $3.6M | Add +35.8% |
| TBCH Turtle Beach Corp. | 0.62% | 231,502 | $3.6M | Add +0.3% |
| AQST Aquestive Therapeutics Inc. | 0.61% | 707,078 | $3.5M | Add +0.3% |
| CRNT Ceragon Networks Ltd. | 0.60% | 1,251,134 | $3.4M | Add +0.3% |
| ZS Zscaler Inc. | 0.58% | 19,629 | $3.4M | Reduce -4.4% |
| XOM Exxon Mobil Corp. | 0.58% | 28,466 | $3.3M | Reduce -10.8% |
| BPMC Blueprint Medicines Corp. | 0.57% | 35,461 | $3.3M | New |
| BMI Badger Meter Inc. | 0.57% | 14,947 | $3.3M | Reduce -9.8% |
| RVLV Revolve Group Inc. Class A | 0.57% | 131,463 | $3.3M | Add +0.1% |
| FTDR Frontdoor Inc. | 0.57% | 67,824 | $3.3M | Add +0.3% |
| BWAY Brainsway Ltd.-ADR | 0.56% | 347,761 | $3.2M | Add +0.3% |
| CVLG Covenant Logistics Group Inc. | 0.56% | 60,604 | $3.2M | Add +0.3% |
| EVR Evercore Inc. Class A | 0.55% | 12,407 | $3.1M | Add +0.3% |
| TILE Interface Inc. | 0.54% | 163,957 | $3.1M | Add +0.3% |
| DIS The Walt Disney Co. filed as DISNEY WALT CO | 0.53% | 31,856 | $3.1M | Reduce -4.8% |
| DCTH Delcath Systems Inc. | 0.53% | 336,722 | $3.0M | Add +0.2% |
| BLDR Builders Firstsource Inc. | 0.53% | 15,611 | $3.0M | Add +0.3% |
| LGTY Logility Supply Chain Soluti filed as AMER SOFTWARE INC | 0.52% | 266,295 | $3.0M | New |
| GEV GE Vernova Inc. | 0.51% | 11,576 | $3.0M | Reduce -1.8% |
| ACVA Acv Auctions Inc. Class A | 0.51% | 143,368 | $2.9M | New |
| STXS Stereotaxis Inc. | 0.50% | 1,410,129 | $2.9M | Add +0.3% |
| BGC BGC Group Inc. Class A | 0.50% | 313,085 | $2.9M | Add +0.3% |
| FOLD Amicus Therapeutics Inc. | 0.50% | 268,743 | $2.9M | Add +0.3% |
| LQDT Liquidity Services Inc. | 0.48% | 120,587 | $2.7M | New |
| MTRX Matrix Service Co. | 0.48% | 238,056 | $2.7M | Add +0.3% |
| TTI Tetra Technologies Inc. | 0.47% | 874,820 | $2.7M | Add +0.3% |
| SMWB Similarweb Ltd. | 0.47% | 305,349 | $2.7M | Add +0.3% |
| PESI Perma-Fix Environmental SVCS | 0.47% | 219,717 | $2.7M | Add +0.3% |
| PHR Phreesia Inc. | 0.47% | 117,849 | $2.7M | Add +44.7% |
| TBBK The Bancorp Inc. | 0.46% | 49,783 | $2.7M | Reduce -37.9% |
| BWXT BWX Technologies Inc. | 0.46% | 24,492 | $2.7M | Reduce -4.1% |
| ONT Onterris Inc. filed as MONTROSE ENVIRONMENTAL GROUP | 0.46% | 100,609 | $2.6M | Add +0.3% |
| CGNT Cognyte Software Ltd. | 0.46% | 389,403 | $2.6M | Add +0.3% |
| PEGA Pegasystems Inc. | 0.46% | 36,091 | $2.6M | New |
| HUBB Hubbell Inc. | 0.46% | 6,109 | $2.6M | Reduce -5.4% |
| ARLO Arlo Technologies Inc. | 0.45% | 214,894 | $2.6M | Add +0.3% |
| INTU Intuit Inc. | 0.45% | 4,189 | $2.6M | Reduce -16.9% |
| PAYX Paychex Inc. | 0.45% | 19,153 | $2.6M | Reduce -5.9% |
| DAWN Day One Biopharmaceuticals I | 0.45% | 184,230 | $2.6M | New |
| NVCR Novocure Ltd. | 0.44% | 161,937 | $2.5M | Add +0.3% |
Portfolio Sells Q2 2024 → Q3 2024
| DVAX Dynavax Technologies Corp. | Sold out | 0.00% | −0.88 |
| TALK Talkspace Inc. | Sold out | 0.00% | −0.67 |
| AMSC American Superconductor Corp. | Reduce -19.6% | 1.91% | −0.62 |
| ATEC Alphatec Holdings Inc. | Sold out | 0.00% | −0.61 |
| PETQ Petiq Inc. | Sold out | 0.00% | −0.61 |
| SSUP Superior Industries Intl | Sold out | 0.00% | −0.55 |
| ARWR Arrowhead Pharmaceuticals Inc. | Sold out | 0.00% | −0.50 |
| ORN Orion Group Holdings Inc. | Sold out | 0.00% | −0.46 |
| HLIO Helios Technologies Inc. | Sold out | 0.00% | −0.46 |
| HRTX Heron Therapeutics Inc. | Sold out | 0.00% | −0.46 |
| AAPL Apple Inc. | Reduce -23.4% | 1.72% | −0.46 |
| GDRX Goodrx Holdings Inc. Class A | Sold out | 0.00% | −0.44 |
| AUDC Audiocodes Ltd. | Sold out | 0.00% | −0.39 |
| LCUT Lifetime Brands Inc. | Sold out | 0.00% | −0.38 |
| LZ Legalzoomcom Inc. | Sold out | 0.00% | −0.36 |
| MSFT Microsoft Corp. | Reduce -7.8% | 1.58% | −0.33 |
| HRTG Heritage Insurance Holdings | Sold out | 0.00% | −0.32 |
| INSM Insmed Inc. | Reduce -25.2% | 0.98% | −0.31 |
| NRDS Nerdwallet Inc. Class A | Sold out | 0.00% | −0.30 |
| MNTX Manitex International Inc. | Sold out | 0.00% | −0.29 |
| SSYS Stratasys Ltd. | Sold out | 0.00% | −0.29 |
| ALTG Alta Equipment Group Inc. | Sold out | 0.00% | −0.29 |
| ASPN Aspen Aerogels Inc. | Reduce -26.9% | 1.04% | −0.27 |
| AXTI Axt Inc. | Sold out | 0.00% | −0.27 |
| RAMP Liveramp Holdings Inc. | Sold out | 0.00% | −0.27 |
| SOPH Sophia Genetics SA | Sold out | 0.00% | −0.26 |
| QUIK Quicklogic Corp. | Sold out | 0.00% | −0.25 |
| CTV Innovid Corp. | Sold out | 0.00% | −0.24 |
| ZWS Zurn Elkay Water Solutions C | Sold out | 0.00% | −0.24 |
| MBLY Mobileye Global Inc. Class A | Sold out | 0.00% | −0.24 |
| BP BP PLC-Spons ADR | Reduce -4.0% | 0.83% | −0.23 |
| THC Tenet Healthcare Corp. | Reduce -27.3% | 1.11% | −0.20 |
| AMZN Amazon.com Inc. | Reduce -4.3% | 1.10% | −0.18 |
| INTU Intuit Inc. | Reduce -16.9% | 0.45% | −0.17 |
| DLHC DLH Holdings Corp. | Reduce -38.1% | 0.17% | −0.16 |
| ZS Zscaler Inc. | Reduce -4.4% | 0.58% | −0.15 |
| PATK Patrick Industries Inc. | Reduce -28.3% | 0.89% | −0.13 |
| DLTR Dollar Tree Inc. | Reduce -8.3% | 0.16% | −0.12 |
| STRL Sterling Infrastructure Inc. | Reduce -20.9% | 1.14% | −0.12 |
| ARRY Array Technologies Inc. | Reduce -6.4% | 0.15% | −0.12 |
| XOM Exxon Mobil Corp. | Reduce -10.8% | 0.58% | −0.11 |
| ENVX Enovix Corp. | Reduce -1.8% | 0.13% | −0.11 |
| CGNX Cognex Corp. | Reduce -2.0% | 0.40% | −0.10 |
| SEM Select Medical Holdings Corp. | Reduce -4.0% | 0.84% | −0.10 |
| TBBK The Bancorp Inc. | Reduce -37.9% | 0.46% | −0.10 |
| XYL Xylem Inc. | Reduce -0.8% | 1.15% | −0.10 |
| DIS The Walt Disney Co. | Reduce -4.8% | 0.53% | −0.09 |
| MLM Martin Marietta Materials | Reduce -24.8% | 0.18% | −0.08 |
| VMI Valmont Industries | Reduce -13.9% | 0.42% | −0.08 |
| LNG Cheniere Energy Inc. | Reduce -16.7% | 0.29% | −0.07 |
Portfolio Buys Q2 2024 → Q3 2024
| PFE Pfizer Inc. | New | 0.76% | +0.76 |
| CXDO Crexendo Inc. | Add +1473.9% | 0.67% | +0.64 |
| TARS Tarsus Pharmaceuticals Inc. | New | 0.63% | +0.63 |
| ZETA Zeta Global Holdings Corp. Class A | Add +0.3% | 1.59% | +0.58 |
| BPMC Blueprint Medicines Corp. | New | 0.57% | +0.57 |
| LGTY Logility Supply Chain Soluti | New | 0.52% | +0.52 |
| ACVA Acv Auctions Inc. Class A | New | 0.51% | +0.51 |
| LQDT Liquidity Services Inc. | New | 0.48% | +0.48 |
| PEGA Pegasystems Inc. | New | 0.46% | +0.46 |
| DAWN Day One Biopharmaceuticals I | New | 0.45% | +0.45 |
| CLPT Clearpoint Neuro Inc. | Add +0.3% | 0.91% | +0.44 |
| AIP Arteris Inc. | New | 0.44% | +0.44 |
| RCEL Avita Medical Inc. | New | 0.43% | +0.43 |
| SIBN Si-Bone Inc. | New | 0.41% | +0.41 |
| SHYF The Shyft Group Inc. | New | 0.40% | +0.40 |
| OLO Olo Inc. Class A | New | 0.39% | +0.39 |
| HCAT Health Catalyst Inc. | New | 0.35% | +0.35 |
| UVE Universal Insurance Holdings | Add +64.6% | 0.78% | +0.35 |
| ITCI Intra-Cellular Therapies Inc. | Add +85.7% | 0.74% | +0.34 |
| BLND Blend Labs Inc. Class A | New | 0.31% | +0.31 |
| TCMD Tactile Systems Technology I | New | 0.31% | +0.31 |
| KELYA Kelly Services Inc. Class A | New | 0.30% | +0.30 |
| EVLV Evolv Technologies Holdings | New | 0.28% | +0.28 |
| IAS Integral Ad Science Holding | New | 0.28% | +0.28 |
| NUTX Nutex Health Inc. | New | 0.28% | +0.28 |
| WLDN Willdan Group Inc. | Add +0.3% | 1.11% | +0.27 |
| AQST Aquestive Therapeutics Inc. | Add +0.3% | 0.61% | +0.27 |
| WMS Advanced Drainage Systems Inc. | New | 0.27% | +0.27 |
| MYO Myomo Inc. | Add +40.2% | 0.63% | +0.24 |
| EOLS Evolus Inc. | Add +0.4% | 0.83% | +0.24 |
| ADPT Adaptive Biotechnologies | Add +15.2% | 0.64% | +0.22 |
| PRCT Procept Biorobotics Corp. | Add +0.3% | 1.13% | +0.21 |
| DCBO Docebo Inc. | Add +35.8% | 0.63% | +0.19 |
| RVLV Revolve Group Inc. Class A | Add +0.1% | 0.57% | +0.18 |
| KNSA Kiniksa Pharmaceuticals Inte | Add +0.4% | 0.87% | +0.18 |
| BWAY Brainsway Ltd.-ADR | Add +0.3% | 0.56% | +0.17 |
| TSEM Tower Semiconductor Ltd. | Add +7.5% | 1.39% | +0.16 |
| PHR Phreesia Inc. | Add +44.7% | 0.47% | +0.15 |
| MP MP Materials Corp. | Add +25.7% | 0.36% | +0.14 |
| FTDR Frontdoor Inc. | Add +0.3% | 0.57% | +0.14 |
| OSPN Onespan Inc. | Add +0.3% | 0.74% | +0.13 |
| EYPT Eyepoint Inc. | Add +234.2% | 0.20% | +0.13 |
| BLDR Builders Firstsource Inc. | Add +0.3% | 0.53% | +0.12 |
| OCUL Ocular Therapeutix Inc. | Add +0.3% | 0.67% | +0.11 |
| TILE Interface Inc. | Add +0.3% | 0.54% | +0.09 |
| NVRI Enviri Corp. | Add +0.3% | 0.70% | +0.07 |
| PHLT Performant Healthcare Inc. | Add +0.3% | 0.43% | +0.07 |
| EVER Everquote Inc. Class A | Add +16.5% | 0.80% | +0.07 |
| GLDD Great Lakes Dredge & Dock Co. | Add +0.3% | 0.64% | +0.07 |
| EVR Evercore Inc. Class A | Add +0.3% | 0.55% | +0.07 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 306 | $763.4M | TSEM, LINC, KNSA, OUST, LGND |
| Q1 2026 | 305 | $631.7M | TSEM, LINC, STRL, KNSA, LGND |
| Q4 2025 | 306 | $655.9M | TSEM, KTOS, STRL, HCI, LGND |
| Q3 2025 | 299 | $653.4M | KTOS, STRL, AMSC, TSEM, INSM |
| Q2 2025 | 298 | $550.0M | KTOS, AMSC, STRL, DRS, AVPT |
| Q1 2025 | 303 | $479.4M | HCI, KTOS, DRS, AAPL, NEE |
| Q4 2024 | 307 | $556.1M | PRIM, AMSC, AAPL, KTOS, HCI |
| Q3 2024 | 302 | $573.7M | AMSC, DRS, AAPL, HCI, NEE |
| Q2 2024 | 302 | $534.7M | AMSC, AAPL, MSFT, DRS, NEE |
| Q1 2024 | 306 | $506.7M | MSFT, AAPL, HCI, NEE, CRM |