Essex Investment Management Co. LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 6, 2026), Essex Investment Management Co. LLC reported 306 stock positions worth $763.4 million. Its top holding was Tower Semiconductor (TSEM) at 3.6% of the portfolio, followed by Lincoln Educational Services (LINC, 2.2%) and Kiniksa Pharmaceuticals Inte (KNSA, 2.0%). Compared with Q1 2026, it opened 24 new positions, sold out of 24, added to 30 and reduced 157. The biggest buy was a new position in Werner Enterprises (WERN) and the biggest sale an exit from Globalstar (GSAT).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0000201772
- Portfolio Value
- $763.4M (Q2 2026)
- SEC Filing
- 0000201772-26-000005 ↗ filed Aug 6, 2026
Holdings Value
Holdings 306 stocks · $763.4M
| TSEM Tower Semiconductor Ltd. | 3.60% | 105,543 | $27.5M | Reduce -9.0% |
| LINC Lincoln Educational Services | 2.22% | 340,366 | $17.0M | Reduce -4.2% |
| KNSA Kiniksa Pharmaceuticals Inte | 2.02% | 241,382 | $15.4M | Reduce -3.2% |
| OUST Ouster Inc. | 1.85% | 226,028 | $14.1M | Add +22.4% |
| LGND Ligand Pharmaceuticals | 1.80% | 43,567 | $13.8M | Reduce -25.5% |
| CECO Ceco Environmental Corp. | 1.79% | 150,416 | $13.6M | Reduce -4.3% |
| STRL Sterling Infrastructure Inc. | 1.78% | 16,155 | $13.6M | Reduce -49.6% |
| AIP Arteris Inc. | 1.77% | 277,665 | $13.5M | Reduce -4.4% |
| MIRM Mirum Pharmaceuticals Inc. | 1.62% | 105,669 | $12.4M | Reduce -2.5% |
| AGX Argan Inc. | 1.62% | 15,467 | $12.4M | Reduce -3.9% |
| GHM Graham Corp. | 1.51% | 93,405 | $11.6M | Reduce -27.2% |
| DRS Leonardo DRS Inc. | 1.40% | 250,215 | $10.7M | Reduce -4.3% |
| ADPT Adaptive Biotechnologies | 1.33% | 472,763 | $10.1M | Reduce -4.2% |
| WERN Werner Enterprises Inc. | 1.32% | 231,625 | $10.1M | New |
| HCI Hci Group Inc. | 1.29% | 56,260 | $9.9M | Reduce -2.4% |
| GEV GE Vernova Inc. | 1.27% | 8,283 | $9.7M | Reduce -0.4% |
| COHU Cohu Inc. | 1.27% | 131,170 | $9.7M | Reduce -31.6% |
| AAPL Apple Inc. | 1.23% | 32,427 | $9.4M | Reduce -0.5% |
| AMSC American Superconductor Corp. | 1.21% | 221,933 | $9.2M | Reduce -2.5% |
| BWAY Brainsway Ltd.-ADR | 1.20% | 592,606 | $9.2M | Reduce -4.2% |
| TTI Tetra Technologies Inc. | 1.10% | 741,007 | $8.4M | Reduce -4.3% |
| LYTS Lsi Industries Inc. | 1.03% | 295,820 | $7.9M | Add +7.9% |
| MRVL Marvell Technology Inc. | 1.01% | 25,911 | $7.7M | Reduce -28.4% |
| KTOS Kratos Defense & Security | 1.00% | 153,576 | $7.7M | Reduce -3.3% |
| TVTX Travere Therapeutics Inc. | 1.00% | 133,866 | $7.6M | Reduce -17.2% |
| GS Goldman Sachs Group Inc. | 1.00% | 7,513 | $7.6M | Reduce -0.6% |
| PATK Patrick Industries Inc. | 0.98% | 82,960 | $7.4M | Add +79.5% |
| ORN Orion Group Holdings Inc. | 0.98% | 442,603 | $7.4M | Reduce -4.2% |
| ASML ASML Holding NV-NY Reg SHS filed as ASML HLDG NV | 0.92% | 3,538 | $7.0M | Reduce -0.5% |
| AMBA Ambarella Inc. | 0.90% | 79,997 | $6.9M | Reduce -2.9% |
| NVCR Novocure Ltd. | 0.87% | 439,648 | $6.7M | Reduce -2.8% |
| AMZN Amazon.com Inc. | 0.84% | 27,062 | $6.4M | Reduce -0.5% |
| AVPT Avepoint Inc. | 0.84% | 571,541 | $6.4M | Add +14.7% |
| WMS Advanced Drainage Systems Inc. | 0.83% | 40,413 | $6.3M | Reduce -0.4% |
| SMTC Semtech Corp. | 0.81% | 38,226 | $6.2M | Reduce -24.5% |
| OII Oceaneering Intl Inc. | 0.80% | 151,463 | $6.1M | Reduce -4.4% |
| ECG Everus Construction Group | 0.79% | 36,377 | $6.0M | Reduce -4.5% |
| AEM Agnico Eagle Mines Ltd. | 0.78% | 38,462 | $6.0M | Reduce -0.5% |
| LQDA Liquidia Corp. | 0.78% | 74,743 | $6.0M | Reduce -4.4% |
| WLDN Willdan Group Inc. | 0.78% | 74,890 | $5.9M | Reduce -4.3% |
| FEIM Frequency Electronics Inc. | 0.77% | 89,043 | $5.9M | Reduce -4.3% |
| MSFT Microsoft Corp. | 0.77% | 15,714 | $5.9M | Reduce -0.5% |
| MAMA Mama's Creations Inc. | 0.76% | 326,938 | $5.8M | Reduce -4.3% |
| XERS Xeris Biopharma Holdings Inc. | 0.74% | 715,608 | $5.7M | Reduce -4.3% |
| PKE Park Aerospace Corp. | 0.72% | 143,663 | $5.5M | Reduce -4.2% |
| BDSX Biodesix Inc. | 0.71% | 241,915 | $5.5M | Add +83.2% |
| XMTR Xometry Inc. Class A | 0.71% | 55,919 | $5.4M | New |
| BXC Bluelinx Holdings Inc. | 0.70% | 86,593 | $5.4M | New |
| MITK Mitek Systems Inc. | 0.70% | 263,913 | $5.3M | Reduce -4.2% |
| CXDO Crexendo Inc. | 0.70% | 710,874 | $5.3M | Reduce -4.3% |
| MIR Mirion Technologies Inc. | 0.69% | 295,060 | $5.3M | Reduce -4.5% |
| RDVT Red Violet Inc. | 0.69% | 82,555 | $5.3M | Add +35.5% |
| JAZZ Jazz Pharmaceuticals PLC | 0.68% | 21,665 | $5.2M | Reduce -0.5% |
| DIOD Diodes Inc. | 0.67% | 46,732 | $5.1M | Reduce -4.4% |
| APYX Apyx Medical Corp. | 0.67% | 1,136,630 | $5.1M | Add +26.1% |
| BWXT BWX Technologies Inc. | 0.65% | 25,431 | $5.0M | Reduce -0.5% |
| OCUL Ocular Therapeutix Inc. | 0.62% | 482,154 | $4.7M | Add +22.8% |
| SFM Sprouts Farmers Market Inc. | 0.61% | 55,176 | $4.7M | Add +430.4% |
| LPTH Lightpath Technologies Inc. Class A | 0.61% | 285,052 | $4.7M | Add +31.6% |
| INSM Insmed Inc. | 0.60% | 42,991 | $4.6M | Reduce -31.4% |
| XZO Exzeo Group Inc. | 0.59% | 268,704 | $4.5M | Reduce -6.7% |
| MG Mistras Group Inc. | 0.59% | 257,127 | $4.5M | Reduce -4.3% |
| SIBN Si-Bone Inc. | 0.58% | 271,404 | $4.4M | Add +27.7% |
| CON Concentra Group Holdings Par | 0.58% | 148,836 | $4.4M | Reduce -0.5% |
| TILE Interface Inc. | 0.58% | 123,401 | $4.4M | New |
| GFF Griffon Corp. | 0.57% | 44,937 | $4.4M | Reduce -4.5% |
| JOUT Johnson Outdoors Inc. Class A | 0.57% | 94,176 | $4.3M | Add +49.8% |
| DAKT Daktronics Inc. | 0.55% | 216,428 | $4.2M | Add +18.9% |
| CMCO Columbus McKinnon Corp. | 0.55% | 278,316 | $4.2M | Add +31.5% |
| BMI Badger Meter Inc. | 0.55% | 28,041 | $4.2M | Add +206.2% |
| MASS 908 Devices Inc. | 0.54% | 470,244 | $4.1M | Reduce -4.3% |
| LQDT Liquidity Services Inc. | 0.53% | 103,302 | $4.0M | Reduce -4.3% |
| PGEN Precigen Inc. | 0.53% | 706,294 | $4.0M | New |
| AXSM Axsome Therapeutics Inc. | 0.52% | 16,244 | $4.0M | Reduce -0.5% |
| AMPX Amprius Technologies Inc. | 0.52% | 284,595 | $3.9M | Reduce -36.1% |
| GMED Globus Medical Inc. Class A | 0.51% | 49,677 | $3.9M | Reduce -0.7% |
| LTRX Lantronix Inc. | 0.51% | 662,070 | $3.9M | Add +93.3% |
| LGCY Legacy Education Inc. | 0.51% | 329,894 | $3.9M | Add +130.0% |
| RSKD Riskified Ltd. Class A | 0.51% | 769,085 | $3.9M | Reduce -4.2% |
| AMTB Amerant Bancorp Inc. | 0.50% | 150,236 | $3.8M | Reduce -4.2% |
| SOPH Sophia Genetics SA | 0.50% | 663,428 | $3.8M | Reduce -4.2% |
| NUVB Nuvation Bio Inc. | 0.50% | 671,041 | $3.8M | New |
| THRM Gentherm Inc. | 0.48% | 107,970 | $3.7M | Reduce -4.6% |
| BKSY Blacksky Technology Inc. | 0.48% | 130,281 | $3.6M | Reduce -4.3% |
| ARQT Arcutis Biotherapeutics Inc. | 0.47% | 137,500 | $3.6M | Reduce -4.5% |
| DLTR Dollar Tree Inc. | 0.47% | 29,455 | $3.6M | Reduce -0.5% |
| BGC BGC Group Inc. Class A | 0.45% | 321,484 | $3.4M | Reduce -4.5% |
| OSG Octave Specialty Group Inc. | 0.44% | 539,289 | $3.4M | Add +28.9% |
| FET Forum Energy Technologies Inc. | 0.44% | 66,611 | $3.3M | New |
| III Information Services Group | 0.44% | 808,345 | $3.3M | Add +110.8% |
| NPCE Neuropace Inc. | 0.43% | 208,703 | $3.3M | Reduce -4.2% |
| RAIL Freightcar America Inc. | 0.43% | 337,662 | $3.3M | Reduce -4.2% |
| NOVT Novanta Inc. | 0.42% | 19,811 | $3.2M | Reduce -4.3% |
| CRWD CrowdStrike Holdings Inc. Class A | 0.42% | 4,169 | $3.2M | New |
| CODA Coda Octopus Group Inc. | 0.41% | 322,278 | $3.1M | Add +69.9% |
| BKR Baker Hughes Co. | 0.40% | 54,375 | $3.0M | Reduce -0.6% |
| IBEX Ibex Ltd. | 0.39% | 98,156 | $3.0M | Add +69.9% |
| DCBO Docebo Inc. | 0.39% | 165,095 | $3.0M | Reduce -4.2% |
| EVR Evercore Inc. Class A | 0.38% | 8,573 | $2.9M | Reduce -4.1% |
| BRC INC-A | 0.38% | 2,624,990 | $2.9M | New |
Portfolio Sells Q1 2026 → Q2 2026
| GSAT Globalstar Inc. | Sold out | 0.00% | −1.74 |
| PRIM Primoris Services Corp. | Sold out | 0.00% | −1.09 |
| INSM Insmed Inc. | Reduce -31.4% | 0.60% | −1.02 |
| BVS Bioventus Inc. Class A | Sold out | 0.00% | −0.87 |
| KTOS Kratos Defense & Security | Reduce -3.3% | 1.00% | −0.77 |
| SNDX Syndax Pharmaceuticals Inc. | Sold out | 0.00% | −0.74 |
| AMPX Amprius Technologies Inc. | Reduce -36.1% | 0.52% | −0.67 |
| AGIO Agios Pharmaceuticals Inc. | Sold out | 0.00% | −0.55 |
| EVER Everquote Inc. Class A | Sold out | 0.00% | −0.53 |
| CRM Salesforce Inc. | Sold out | 0.00% | −0.53 |
| VREX Varex Imaging Corp. | Sold out | 0.00% | −0.47 |
| AEM Agnico Eagle Mines Ltd. | Reduce -0.5% | 0.78% | −0.46 |
| DRS Leonardo DRS Inc. | Reduce -4.3% | 1.40% | −0.44 |
| INFU Infusystem Holdings Inc. | Sold out | 0.00% | −0.44 |
| CCLD Carecloud Inc. | Sold out | 0.00% | −0.40 |
| ONT Onterris Inc. | Sold out | 0.00% | −0.39 |
| EXTR Extreme Networks Inc. | Sold out | 0.00% | −0.38 |
| WK Workiva Inc. | Reduce -98.0% | 0.00% | −0.34 |
| IDN Intellicheck Inc. | Reduce -9.2% | 0.26% | −0.33 |
| LAW CS Disco Inc. | Sold out | 0.00% | −0.33 |
| GENC Gencor Industries Inc. | Sold out | 0.00% | −0.31 |
| STRL Sterling Infrastructure Inc. | Reduce -49.6% | 1.78% | −0.29 |
| INVE Inve Technologies Inc. | Reduce -34.2% | 0.16% | −0.27 |
| ZS Zscaler Inc. | Sold out | 0.00% | −0.25 |
| PEGA Pegasystems Inc. | Reduce -11.9% | 0.26% | −0.24 |
| ALLT Allot Ltd. | Sold out | 0.00% | −0.24 |
| RPID Rapid Micro Biosystems Inc. Class A | Reduce -59.0% | 0.08% | −0.24 |
| MIR Mirion Technologies Inc. | Reduce -4.5% | 0.69% | −0.22 |
| ERII Energy Recovery Inc. | Sold out | 0.00% | −0.21 |
| BWXT BWX Technologies Inc. | Reduce -0.5% | 0.65% | −0.18 |
| WLDN Willdan Group Inc. | Reduce -4.3% | 0.78% | −0.17 |
| GMED Globus Medical Inc. Class A | Reduce -0.7% | 0.51% | −0.17 |
| GWRE Guidewire Software Inc. | Reduce -0.5% | 0.34% | −0.16 |
| MSFT Microsoft Corp. | Reduce -0.5% | 0.77% | −0.16 |
| MTDR Matador Resources Co. | Reduce -5.5% | 0.25% | −0.15 |
| XPRO Expro Group Holdings NV | Reduce -4.5% | 0.28% | −0.14 |
| BKR Baker Hughes Co. | Reduce -0.6% | 0.40% | −0.13 |
| STXS Stereotaxis Inc. | Reduce -4.3% | 0.34% | −0.12 |
| HCI Hci Group Inc. | Reduce -2.4% | 1.29% | −0.12 |
| LNG Cheniere Energy Inc. | Reduce -1.2% | 0.25% | −0.11 |
| ARLO Arlo Technologies Inc. | Reduce -4.5% | 0.32% | −0.11 |
| CTVA Corteva Inc. | Reduce -31.8% | 0.14% | −0.11 |
| ENPH Enphase Energy Inc. | Reduce -50.0% | 0.11% | −0.10 |
| BWAY Brainsway Ltd.-ADR | Reduce -4.2% | 1.20% | −0.10 |
| UPWK Upwork Inc. | Reduce -4.5% | 0.14% | −0.10 |
| PAY Paymentus Holdings Inc. Class A | Reduce -4.5% | 0.29% | −0.09 |
| INTU Intuit Inc. | Reduce -20.2% | 0.06% | −0.09 |
| DCBO Docebo Inc. | Reduce -4.2% | 0.39% | −0.09 |
| GHM Graham Corp. | Reduce -27.2% | 1.51% | −0.09 |
| OII Oceaneering Intl Inc. | Reduce -4.4% | 0.80% | −0.09 |
Portfolio Buys Q1 2026 → Q2 2026
| WERN Werner Enterprises Inc. | New | 1.32% | +1.32 |
| OUST Ouster Inc. | Add +22.4% | 1.85% | +1.31 |
| XMTR Xometry Inc. Class A | New | 0.71% | +0.71 |
| BXC Bluelinx Holdings Inc. | New | 0.70% | +0.70 |
| TILE Interface Inc. | New | 0.58% | +0.58 |
| PGEN Precigen Inc. | New | 0.53% | +0.53 |
| NUVB Nuvation Bio Inc. | New | 0.50% | +0.50 |
| SFM Sprouts Farmers Market Inc. | Add +430.4% | 0.61% | +0.48 |
| FET Forum Energy Technologies Inc. | New | 0.44% | +0.44 |
| CRWD CrowdStrike Holdings Inc. Class A | New | 0.42% | +0.42 |
| BDSX Biodesix Inc. | Add +83.2% | 0.71% | +0.41 |
| BRC INC-A | New | 0.38% | +0.38 |
| KVHI KVH Industries Inc. | New | 0.38% | +0.38 |
| REAL The Realreal Inc. | New | 0.36% | +0.36 |
| RDVT Red Violet Inc. | Add +35.5% | 0.69% | +0.36 |
| P Everpure Inc. Class A | New | 0.33% | +0.33 |
| BMI Badger Meter Inc. | Add +206.2% | 0.55% | +0.32 |
| TNXP Tonix Pharmaceuticals Holdin | New | 0.28% | +0.28 |
| LPTH Lightpath Technologies Inc. Class A | Add +31.6% | 0.61% | +0.27 |
| IWO iShares Russell 2000 Growth | Add +226.6% | 0.37% | +0.26 |
| LTRX Lantronix Inc. | Add +93.3% | 0.51% | +0.23 |
| LGCY Legacy Education Inc. | Add +130.0% | 0.51% | +0.22 |
| LYTS Lsi Industries Inc. | Add +7.9% | 1.03% | +0.22 |
| III Information Services Group | Add +110.8% | 0.44% | +0.20 |
| PATK Patrick Industries Inc. | Add +79.5% | 0.98% | +0.16 |
| SIBN Si-Bone Inc. | Add +27.7% | 0.58% | +0.16 |
| IBEX Ibex Ltd. | Add +69.9% | 0.39% | +0.15 |
| APYX Apyx Medical Corp. | Add +26.1% | 0.67% | +0.14 |
| OSG Octave Specialty Group Inc. | Add +28.9% | 0.44% | +0.13 |
| ALFEN NV | Add +74.8% | 0.19% | +0.11 |
| CTATF Contemporary Amperex Techn-H | New | 0.11% | +0.11 |
| JOUT Johnson Outdoors Inc. Class A | Add +49.8% | 0.57% | +0.11 |
| MP MP Materials Corp. | New | 0.10% | +0.10 |
| FOCL Edap TMS SA -ADR | New | 0.10% | +0.10 |
| ELVA Electrovaya Inc. | New | 0.10% | +0.10 |
| OCUL Ocular Therapeutix Inc. | Add +22.8% | 0.62% | +0.09 |
| SEDG Solaredge Technologies Inc. | New | 0.09% | +0.09 |
| AVPT Avepoint Inc. | Add +14.7% | 0.84% | +0.09 |
| BLND Blend Labs Inc. Class A | Add +64.6% | 0.28% | +0.08 |
| CCJ Cameco Corp. | New | 0.08% | +0.08 |
| CODA Coda Octopus Group Inc. | Add +69.9% | 0.41% | +0.07 |
| CMCO Columbus McKinnon Corp. | Add +31.5% | 0.55% | +0.06 |
| MWH Solv Energy Inc. Class A | Add +70.9% | 0.14% | +0.05 |
| EOSE Eos Energy Enterprises Inc. | New | 0.05% | +0.05 |
| OCC Optical Cable Corp. | New | 0.03% | +0.03 |
| LNN Lindsay Corp. | Add +51.9% | 0.15% | +0.03 |
| POCI Precision Optics Corp. Inc. | New | 0.03% | +0.03 |
| ALAR Alarum Technologies Ltd.-ADR | New | 0.03% | +0.03 |
| FATN Fatpipe Inc. | New | 0.02% | +0.02 |
| OESX Orion Energy Systems Inc. | Add +64.1% | 0.03% | +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 |