Essex Investment Management Co. LLC
In its 13F for Q4 2025 (holdings as of December 31, 2025, filed February 13, 2026), Essex Investment Management Co. LLC reported 306 stock positions worth $655.9 million. Its top holding was Tower Semiconductor (TSEM) at 3.4% of the portfolio, followed by Kratos Defense & Security (KTOS, 2.2%) and Sterling Infrastructure (STRL, 2.1%). Compared with Q3 2025, it opened 35 new positions, sold out of 29, added to 22 and reduced 127. The biggest buy was a new position in Exzeo (XZO) and the biggest sale American Superconductor (AMSC, shares −12%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0000201772
- Portfolio Value
- $655.9M (Q4 2025)
- SEC Filing
- 0000201772-26-000001 ↗ filed Feb 13, 2026
Holdings Value
Holdings 306 stocks · $655.9M
| TSEM Tower Semiconductor Ltd. | 3.45% | 192,628 | $22.6M | Reduce -1.9% |
| KTOS Kratos Defense & Security | 2.20% | 190,194 | $14.4M | Reduce -22.1% |
| STRL Sterling Infrastructure Inc. | 2.09% | 44,685 | $13.7M | Reduce -2.1% |
| HCI Hci Group Inc. | 1.73% | 59,209 | $11.3M | Reduce -1.8% |
| LGND Ligand Pharmaceuticals | 1.73% | 60,020 | $11.3M | Reduce -1.8% |
| INSM Insmed Inc. | 1.66% | 62,423 | $10.9M | Reduce -28.3% |
| KNSA Kiniksa Pharmaceuticals Inte | 1.58% | 250,975 | $10.4M | Add +1.5% |
| GSAT Globalstar Inc. | 1.56% | 167,389 | $10.2M | Reduce -13.9% |
| ADPT Adaptive Biotechnologies | 1.55% | 624,217 | $10.1M | Reduce -2.2% |
| AAPL Apple Inc. | 1.45% | 34,868 | $9.5M | Reduce -3.8% |
| LINC Lincoln Educational Services | 1.43% | 388,819 | $9.4M | Reduce -2.1% |
| CECO Ceco Environmental Corp. | 1.41% | 154,457 | $9.2M | Reduce -2.2% |
| GHM Graham Corp. | 1.38% | 140,691 | $9.0M | Reduce -2.1% |
| MIRM Mirum Pharmaceuticals Inc. | 1.34% | 111,310 | $8.8M | Reduce -1.9% |
| DRS Leonardo DRS Inc. | 1.33% | 256,862 | $8.8M | Reduce -2.2% |
| AGX Argan Inc. | 1.32% | 27,628 | $8.7M | Reduce -2.4% |
| MSFT Microsoft Corp. | 1.30% | 17,613 | $8.5M | Reduce -3.6% |
| WLDN Willdan Group Inc. | 1.22% | 76,921 | $8.0M | Reduce -2.5% |
| GS Goldman Sachs Group Inc. | 1.16% | 8,659 | $7.6M | Reduce -3.7% |
| TTI Tetra Technologies Inc. | 1.09% | 760,393 | $7.1M | Reduce -2.1% |
| MIR Mirion Technologies Inc. | 1.08% | 303,352 | $7.1M | Reduce -2.3% |
| XZO Exzeo Group Inc. | 1.08% | 291,076 | $7.1M | New |
| AVPT Avepoint Inc. | 1.08% | 508,014 | $7.1M | Reduce -2.0% |
| AEM Agnico Eagle Mines Ltd. | 1.03% | 40,022 | $6.8M | Reduce -2.0% |
| AMZN Amazon.com Inc. | 1.01% | 28,833 | $6.7M | Reduce -1.5% |
| BBNX Beta Bionics Inc. | 1.01% | 217,796 | $6.6M | Reduce -2.2% |
| PRIM Primoris Services Corp. | 0.96% | 50,981 | $6.3M | Reduce -7.5% |
| EVER Everquote Inc. Class A | 0.95% | 231,424 | $6.2M | Reduce -1.9% |
| WMS Advanced Drainage Systems Inc. | 0.95% | 42,835 | $6.2M | Reduce -0.1% |
| AMSC American Superconductor Corp. | 0.94% | 215,154 | $6.2M | Reduce -12.4% |
| TVTX Travere Therapeutics Inc. | 0.92% | 158,709 | $6.1M | Reduce -2.0% |
| UVE Universal Insurance Holdings | 0.91% | 177,374 | $6.0M | Reduce -2.1% |
| AMBA Ambarella Inc. | 0.91% | 83,843 | $5.9M | Reduce -1.8% |
| BWAY Brainsway Ltd.-ADR | 0.88% | 304,180 | $5.8M | Reduce -2.1% |
| XERS Xeris Biopharma Holdings Inc. | 0.88% | 734,532 | $5.8M | Reduce -2.1% |
| GEV GE Vernova Inc. | 0.86% | 8,603 | $5.6M | Reduce -9.3% |
| CRM Salesforce Inc. | 0.77% | 19,080 | $5.1M | Reduce -1.8% |
| PATK Patrick Industries Inc. | 0.76% | 45,941 | $5.0M | Reduce -2.0% |
| LYTS Lsi Industries Inc. | 0.75% | 269,248 | $4.9M | Reduce -2.1% |
| FEIM Frequency Electronics Inc. | 0.75% | 91,380 | $4.9M | Reduce -2.2% |
| PEGA Pegasystems Inc. | 0.72% | 79,424 | $4.7M | Reduce -1.5% |
| CXDO Crexendo Inc. | 0.72% | 729,877 | $4.7M | Reduce -2.1% |
| BWXT BWX Technologies Inc. | 0.72% | 27,247 | $4.7M | Reduce -1.6% |
| OCUL Ocular Therapeutix Inc. | 0.71% | 385,825 | $4.7M | Reduce -2.1% |
| ANGO Angiodynamics Inc. | 0.71% | 360,544 | $4.6M | Add +10.1% |
| MAMA Mama's Creations Inc. | 0.69% | 335,624 | $4.5M | Reduce -1.8% |
| GWRE Guidewire Software Inc. | 0.69% | 22,514 | $4.5M | Reduce -1.7% |
| GMED Globus Medical Inc. Class A | 0.68% | 51,409 | $4.5M | Reduce -2.3% |
| ORN Orion Group Holdings Inc. | 0.68% | 449,761 | $4.5M | Add +44.8% |
| WGO Winnebago Industries | 0.68% | 109,490 | $4.4M | New |
| AIP Arteris Inc. | 0.67% | 285,167 | $4.4M | Reduce -2.4% |
| COHU Cohu Inc. | 0.67% | 188,533 | $4.4M | Reduce -2.2% |
| SIBN Si-Bone Inc. | 0.63% | 208,722 | $4.1M | Reduce -2.2% |
| LAW CS Disco Inc. | 0.63% | 529,780 | $4.1M | Add +19.3% |
| MXL Maxlinear Inc. | 0.63% | 235,595 | $4.1M | Reduce -1.9% |
| ARQT Arcutis Biotherapeutics Inc. | 0.63% | 141,271 | $4.1M | Reduce -28.0% |
| AMPX Amprius Technologies Inc. | 0.62% | 516,765 | $4.1M | Reduce -25.9% |
| ASML ASML Holding NV-NY Reg SHS | 0.62% | 3,806 | $4.1M | Reduce -1.6% |
| THRM Gentherm Inc. | 0.62% | 111,037 | $4.0M | New |
| GLDD Great Lakes Dredge & Dock Co. | 0.60% | 301,986 | $4.0M | Reduce -2.2% |
| JAZZ Jazz Pharmaceuticals PLC | 0.60% | 23,195 | $3.9M | Add +13.3% |
| OUST Ouster Inc. | 0.60% | 181,326 | $3.9M | Reduce -2.3% |
| DLTR Dollar Tree Inc. | 0.60% | 31,777 | $3.9M | Reduce -5.4% |
| RAIL Freightcar America Inc. | 0.58% | 346,144 | $3.8M | Add +68.7% |
| OII Oceaneering Intl Inc. | 0.57% | 155,434 | $3.7M | Reduce -2.4% |
| SMTC Semtech Corp. | 0.56% | 49,707 | $3.7M | Reduce -2.4% |
| STXS Stereotaxis Inc. | 0.55% | 1,562,019 | $3.6M | Reduce -2.3% |
| CMCO Columbus McKinnon Corp. | 0.55% | 207,990 | $3.6M | New |
| DAKT Daktronics Inc. | 0.54% | 178,876 | $3.5M | New |
| TRMB Trimble Inc. | 0.52% | 43,608 | $3.4M | Reduce -4.5% |
| RDVT Red Violet Inc. | 0.52% | 59,863 | $3.4M | Reduce -2.2% |
| WK Workiva Inc. | 0.52% | 39,520 | $3.4M | Add +5328.6% |
| GFF Griffon Corp. | 0.52% | 46,200 | $3.4M | Reduce -2.3% |
| NPCE Neuropace Inc. | 0.50% | 213,892 | $3.3M | Reduce -1.3% |
| LQDT Liquidity Services Inc. | 0.49% | 106,088 | $3.2M | Reduce -2.2% |
| ECG Everus Construction Group | 0.49% | 37,392 | $3.2M | Reduce -2.4% |
| OSG Octave Specialty Group Inc. | 0.49% | 410,822 | $3.2M | New |
| VREX Varex Imaging Corp. | 0.49% | 274,339 | $3.2M | New |
| AXSM Axsome Therapeutics Inc. | 0.48% | 17,381 | $3.2M | Add +5383.0% |
| CON Concentra Group Holdings Par | 0.48% | 160,645 | $3.2M | Reduce -1.8% |
| PKE Park Aerospace Corp. | 0.48% | 147,248 | $3.1M | Reduce -2.1% |
| AMTB Amerant Bancorp Inc. | 0.46% | 154,090 | $3.0M | New |
| RDCM Radcom Ltd. | 0.46% | 228,305 | $3.0M | Reduce -2.2% |
| EVR Evercore Inc. Class A | 0.45% | 8,769 | $3.0M | Reduce -2.1% |
| BGC BGC Group Inc. Class A | 0.45% | 330,509 | $3.0M | Reduce -2.4% |
| PAY Paymentus Holdings Inc. Class A | 0.45% | 93,075 | $2.9M | Reduce -2.4% |
| CRNT Ceragon Networks Ltd. | 0.45% | 1,391,697 | $2.9M | Reduce -1.9% |
| BVS Bioventus Inc. Class A | 0.44% | 387,886 | $2.9M | New |
| INVE Inve Technologies Inc. filed as IDENTIV INC | 0.42% | 723,685 | $2.8M | Add +75.6% |
| ZS Zscaler Inc. | 0.42% | 12,238 | $2.8M | Reduce -1.6% |
| ONT Onterris Inc. filed as MONTROSE ENVIRONMENTAL GROUP | 0.41% | 109,513 | $2.7M | Reduce -2.2% |
| UPWK Upwork Inc. | 0.41% | 135,636 | $2.7M | Reduce -2.2% |
| BKR Baker Hughes Co. | 0.41% | 58,692 | $2.7M | Reduce -1.9% |
| DERM Journey Medical Corp. | 0.41% | 345,977 | $2.7M | Reduce -2.3% |
| DIS The Walt Disney Co. filed as DISNEY WALT CO | 0.41% | 23,423 | $2.7M | Reduce -9.8% |
| LZ Legalzoomcom Inc. | 0.41% | 267,857 | $2.7M | Reduce -2.4% |
| ARLO Arlo Technologies Inc. | 0.40% | 188,919 | $2.6M | Reduce -2.3% |
| INFU Infusystem Holdings Inc. | 0.40% | 294,057 | $2.6M | Reduce -2.1% |
| EXTR Extreme Networks Inc. | 0.39% | 155,087 | $2.6M | Reduce -2.4% |
| MASS 908 Devices Inc. | 0.39% | 482,614 | $2.5M | Reduce -2.3% |
Portfolio Sells Q3 2025 → Q4 2025
| AMSC American Superconductor Corp. | Reduce -12.4% | 0.94% | −1.29 |
| KTOS Kratos Defense & Security | Reduce -22.1% | 2.20% | −1.21 |
| CLPT Clearpoint Neuro Inc. | Sold out | 0.00% | −0.78 |
| NVRI Enviri Corp. | Sold out | 0.00% | −0.68 |
| PENG Penguin Solutions Inc. | Sold out | 0.00% | −0.68 |
| STKL Sunopta Inc. | Sold out | 0.00% | −0.62 |
| OSPN Onespan Inc. | Sold out | 0.00% | −0.55 |
| SMWB Similarweb Ltd. | Sold out | 0.00% | −0.54 |
| AMPX Amprius Technologies Inc. | Reduce -25.9% | 0.62% | −0.50 |
| DRS Leonardo DRS Inc. | Reduce -2.2% | 1.33% | −0.49 |
| WOR Worthington Enterprises Inc. | Sold out | 0.00% | −0.47 |
| CVLG Covenant Logistics Group Inc. | Sold out | 0.00% | −0.44 |
| TRNS Transcat Inc. | Sold out | 0.00% | −0.44 |
| MTRX Matrix Service Co. | Sold out | 0.00% | −0.43 |
| KMDA Kamada Ltd. | Sold out | 0.00% | −0.42 |
| ASPN Aspen Aerogels Inc. | Sold out | 0.00% | −0.42 |
| RRC Range Resources Corp. | Reduce -98.4% | 0.01% | −0.38 |
| AVD American Vanguard Corp. | Sold out | 0.00% | −0.33 |
| PESI Perma-Fix Environmental SVCS | Sold out | 0.00% | −0.30 |
| EXEL Exelixis Inc. | Sold out | 0.00% | −0.29 |
| STRL Sterling Infrastructure Inc. | Reduce -2.1% | 2.09% | −0.29 |
| FVRR Fiverr International Ltd. | Sold out | 0.00% | −0.28 |
| MASS 908 Devices Inc. | Reduce -2.3% | 0.39% | −0.28 |
| INSM Insmed Inc. | Reduce -28.3% | 1.66% | −0.26 |
| HVT Haverty Furniture | Sold out | 0.00% | −0.25 |
| AISP Airship AI Holdings Inc. | Sold out | 0.00% | −0.25 |
| LYTS Lsi Industries Inc. | Reduce -2.1% | 0.75% | −0.24 |
| STXS Stereotaxis Inc. | Reduce -2.3% | 0.55% | −0.21 |
| PRIM Primoris Services Corp. | Reduce -7.5% | 0.96% | −0.19 |
| AMBA Ambarella Inc. | Reduce -1.8% | 0.91% | −0.17 |
| OUST Ouster Inc. | Reduce -2.3% | 0.60% | −0.17 |
| AEHR Aehr Test Systems | Sold out | 0.00% | −0.16 |
| CURI Curiositystream Inc. | Reduce -2.0% | 0.35% | −0.15 |
| ZS Zscaler Inc. | Reduce -1.6% | 0.42% | −0.15 |
| MSFT Microsoft Corp. | Reduce -3.6% | 1.30% | −0.15 |
| GWRE Guidewire Software Inc. | Reduce -1.7% | 0.69% | −0.12 |
| AVPT Avepoint Inc. | Reduce -2.0% | 1.08% | −0.11 |
| PHR Phreesia Inc. | Reduce -2.4% | 0.26% | −0.11 |
| KRNT Kornit Digital Ltd. | Sold out | 0.00% | −0.11 |
| EXTR Extreme Networks Inc. | Reduce -2.4% | 0.39% | −0.11 |
| ARLO Arlo Technologies Inc. | Reduce -2.3% | 0.40% | −0.10 |
| TEM Tempus AI Inc. Class A | Reduce -1.6% | 0.24% | −0.10 |
| CPRT Copart Inc. | Sold out | 0.00% | −0.09 |
| DCBO Docebo Inc. | Reduce -2.3% | 0.34% | −0.09 |
| BLND Blend Labs Inc. Class A | Reduce -2.1% | 0.35% | −0.08 |
| INFU Infusystem Holdings Inc. | Reduce -2.1% | 0.40% | −0.07 |
| CGNX Cognex Corp. | Reduce -7.0% | 0.20% | −0.07 |
| CTM Castellum Inc. | Reduce -1.8% | 0.29% | −0.07 |
| BWXT BWX Technologies Inc. | Reduce -1.6% | 0.72% | −0.06 |
| RDCM Radcom Ltd. | Reduce -2.2% | 0.46% | −0.06 |
Portfolio Buys Q3 2025 → Q4 2025
| XZO Exzeo Group Inc. | New | 1.08% | +1.08 |
| WGO Winnebago Industries | New | 0.68% | +0.68 |
| THRM Gentherm Inc. | New | 0.62% | +0.62 |
| CMCO Columbus McKinnon Corp. | New | 0.55% | +0.55 |
| DAKT Daktronics Inc. | New | 0.54% | +0.54 |
| WK Workiva Inc. | Add +5328.6% | 0.52% | +0.51 |
| OSG Octave Specialty Group Inc. | New | 0.49% | +0.49 |
| VREX Varex Imaging Corp. | New | 0.49% | +0.49 |
| AXSM Axsome Therapeutics Inc. | Add +5383.0% | 0.48% | +0.48 |
| AMTB Amerant Bancorp Inc. | New | 0.46% | +0.46 |
| BVS Bioventus Inc. Class A | New | 0.44% | +0.44 |
| PROF Profound Medical Corp. | New | 0.37% | +0.37 |
| III Information Services Group | New | 0.33% | +0.33 |
| IDN Intellicheck Inc. | New | 0.33% | +0.33 |
| CCLD Carecloud Inc. | New | 0.30% | +0.30 |
| IFNNF Infineon Technologies AG | New | 0.30% | +0.30 |
| ORN Orion Group Holdings Inc. | Add +44.8% | 0.68% | +0.29 |
| RAIL Freightcar America Inc. | Add +68.7% | 0.58% | +0.28 |
| SLND Southland Holdings Inc. | New | 0.24% | +0.24 |
| INVE Inve Technologies Inc. | Add +75.6% | 0.42% | +0.21 |
| CTVA Corteva Inc. | New | 0.20% | +0.20 |
| JAZZ Jazz Pharmaceuticals PLC | Add +13.3% | 0.60% | +0.19 |
| LAW CS Disco Inc. | Add +19.3% | 0.63% | +0.19 |
| ANGO Angiodynamics Inc. | Add +10.1% | 0.71% | +0.15 |
| SHLS Shoals Technologies Group -A | New | 0.12% | +0.12 |
| ENPH Enphase Energy Inc. | New | 0.12% | +0.12 |
| CARR Carrier Global Corp. | New | 0.12% | +0.12 |
| KNSA Kiniksa Pharmaceuticals Inte | Add +1.5% | 1.58% | +0.11 |
| RIVN Rivian Automotive Inc. Class A | Add +70.0% | 0.17% | +0.10 |
| IWO iShares Russell 2000 Growth | New | 0.09% | +0.09 |
| DFLI Dragonfly Energy Holdings Co. | New | 0.09% | +0.09 |
| EME Emcor Group Inc. | New | 0.07% | +0.07 |
| ARRY Array Technologies Inc. | New | 0.07% | +0.07 |
| CRGO Freightos Ltd. | Add +100.3% | 0.21% | +0.06 |
| BMI Badger Meter Inc. | Add +18.8% | 0.25% | +0.03 |
| TRT Trio-Tech International | New | 0.03% | +0.03 |
| NSPR Inspiremd Inc. | New | 0.03% | +0.03 |
| OSS One Stop Systems Inc. | Add +22.6% | 0.08% | +0.03 |
| AEVA Aeva Technologies Inc. | Add +41.6% | 0.12% | +0.03 |
| IOT Samsara Inc. Class A | Add +21.8% | 0.20% | +0.03 |
| VNCE Vince Holding Corp. | New | 0.03% | +0.03 |
| NEUROONE MED TECHNOLOGIES CO | New | 0.02% | +0.02 |
| RFIL RF Industries Ltd. | New | 0.02% | +0.02 |
| CSBR Champions Oncology Inc. | New | 0.02% | +0.02 |
| HBIO Harvard Bioscience Inc. | New | 0.02% | +0.02 |
| CODA Coda Octopus Group Inc. | Add +61.4% | 0.03% | +0.02 |
| NEPH Nephros Inc. | Add +57.0% | 0.03% | +0.01 |
| SPY SS SPDR S&P 500 ETF Trust-US | New | 0.01% | +0.01 |
| AMRX Amneal Pharmaceuticals Inc. | New | 0.01% | +0.01 |
| JNJ Johnson & Johnson | Add +0.3% | 0.08% | +0.01 |
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 |