Essex Investment Management Co. LLC
In its 13F for Q2 2025 (holdings as of June 30, 2025, filed August 12, 2025), Essex Investment Management Co. LLC reported 298 stock positions worth $550.0 million. Its top holding was Kratos Defense & Security (KTOS) at 3.0% of the portfolio, followed by American Superconductor (AMSC, 2.3%) and Sterling Infrastructure (STRL, 2.2%). Compared with Q1 2025, it opened 24 new positions, sold out of 29, added to 24 and reduced 150. The biggest buy was a new position in Mirum Pharmaceuticals (MIRM) and the biggest sale an exit from Intra-Cellular Therapies (ITCI).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0000201772
- Portfolio Value
- $550.0M (Q2 2025)
- SEC Filing
- 0000201772-25-000006 ↗ filed Aug 12, 2025
Holdings Value
Holdings 298 stocks · $550.0M
| KTOS Kratos Defense & Security | 2.96% | 350,352 | $16.3M | Reduce -1.2% |
| AMSC American Superconductor Corp. | 2.31% | 346,042 | $12.7M | Reduce -7.0% |
| STRL Sterling Infrastructure Inc. | 2.23% | 53,121 | $12.3M | Reduce -1.5% |
| DRS Leonardo DRS Inc. | 2.15% | 254,042 | $11.8M | Reduce -0.7% |
| AVPT Avepoint Inc. | 1.80% | 512,703 | $9.9M | Reduce -1.3% |
| MSFT Microsoft Corp. | 1.67% | 18,485 | $9.2M | Reduce -1.7% |
| HCI Hci Group Inc. | 1.66% | 59,981 | $9.1M | Reduce -23.0% |
| LINC Lincoln Educational Services | 1.61% | 384,552 | $8.9M | Reduce -0.7% |
| TSEM Tower Semiconductor Ltd. | 1.54% | 195,296 | $8.5M | Add +12.8% |
| GEV GE Vernova Inc. | 1.39% | 14,485 | $7.7M | Add +93.8% |
| AAPL Apple Inc. | 1.37% | 36,647 | $7.5M | Reduce -2.4% |
| ADPT Adaptive Biotechnologies | 1.31% | 617,299 | $7.2M | Reduce -0.7% |
| LGND Ligand Pharmaceuticals | 1.26% | 60,810 | $6.9M | Reduce -1.4% |
| GHM Graham Corp. | 1.25% | 138,974 | $6.9M | Reduce -0.6% |
| WLDN Willdan Group Inc. | 1.22% | 107,227 | $6.7M | Reduce -21.8% |
| INSM Insmed Inc. | 1.21% | 66,345 | $6.7M | Reduce -0.7% |
| AMZN Amazon.com Inc. | 1.18% | 29,599 | $6.5M | Reduce -2.3% |
| GS Goldman Sachs Group Inc. | 1.18% | 9,149 | $6.5M | Add +0.6% |
| MIR Mirion Technologies Inc. | 1.17% | 299,816 | $6.5M | Reduce -0.7% |
| OUST Ouster Inc. | 1.10% | 250,172 | $6.1M | Reduce -6.2% |
| AGX Argan Inc. | 1.10% | 27,318 | $6.0M | Reduce -24.6% |
| MIRM Mirum Pharmaceuticals Inc. | 1.04% | 112,731 | $5.7M | New |
| EVER Everquote Inc. Class A | 1.03% | 234,677 | $5.7M | Add +40.6% |
| AMBA Ambarella Inc. | 1.01% | 84,479 | $5.6M | Reduce -2.3% |
| NEE Nextera Energy Inc. | 1.00% | 79,535 | $5.5M | Reduce -25.1% |
| GWRE Guidewire Software Inc. | 1.00% | 23,265 | $5.5M | Reduce -40.1% |
| CRM Salesforce Inc. | 0.97% | 19,497 | $5.3M | Reduce -2.2% |
| AEM Agnico Eagle Mines Ltd. | 0.89% | 41,294 | $4.9M | Reduce -2.4% |
| UVE Universal Insurance Holdings | 0.88% | 175,408 | $4.9M | Reduce -0.7% |
| KNSA Kiniksa Pharmaceuticals Inte | 0.86% | 171,437 | $4.7M | Reduce -0.7% |
| BPMC Blueprint Medicines Corp. | 0.85% | 36,291 | $4.7M | Reduce -12.6% |
| LYTS Lsi Industries Inc. | 0.82% | 266,221 | $4.5M | Reduce -0.7% |
| PEGA Pegasystems Inc. | 0.81% | 81,973 | $4.4M | Add +95.9% |
| CXDO Crexendo Inc. | 0.80% | 721,828 | $4.4M | Reduce -0.7% |
| PRIM Primoris Services Corp. | 0.79% | 55,869 | $4.4M | Reduce -10.8% |
| CECO Ceco Environmental Corp. | 0.79% | 152,743 | $4.3M | Reduce -0.7% |
| AMPX Amprius Technologies Inc. | 0.78% | 1,025,357 | $4.3M | Add +9.6% |
| PATK Patrick Industries Inc. | 0.77% | 46,055 | $4.2M | Reduce -0.9% |
| BWXT BWX Technologies Inc. | 0.74% | 28,128 | $4.1M | Add +30.7% |
| NUTX Nutex Health Inc. | 0.73% | 32,403 | $4.0M | Reduce -62.9% |
| ZS Zscaler Inc. | 0.72% | 12,641 | $4.0M | Reduce -2.1% |
| BWAY Brainsway Ltd.-ADR | 0.72% | 300,940 | $4.0M | Reduce -0.7% |
| STKL Sunopta Inc. | 0.72% | 681,702 | $4.0M | Reduce -3.0% |
| CLPT Clearpoint Neuro Inc. | 0.71% | 325,378 | $3.9M | Reduce -0.6% |
| SIBN Si-Bone Inc. | 0.71% | 206,408 | $3.9M | Reduce -0.7% |
| OSPN Onespan Inc. | 0.67% | 220,306 | $3.7M | Reduce -0.7% |
| CON Concentra Group Holdings Par | 0.67% | 178,412 | $3.7M | Add +80.0% |
| GLDD Great Lakes Dredge & Dock Co. | 0.66% | 298,682 | $3.6M | Reduce -0.7% |
| MRC MRC Global Inc. | 0.66% | 264,799 | $3.6M | Reduce -0.7% |
| THC Tenet Healthcare Corp. | 0.65% | 20,234 | $3.6M | Reduce -15.4% |
| OCUL Ocular Therapeutix Inc. | 0.64% | 381,595 | $3.5M | Reduce -0.7% |
| OLO Olo Inc. Class A | 0.63% | 387,672 | $3.5M | Reduce -0.7% |
| DLTR Dollar Tree Inc. | 0.62% | 34,483 | $3.4M | Add +108.3% |
| MASS 908 Devices Inc. | 0.62% | 477,342 | $3.4M | Reduce -0.7% |
| XERS Xeris Biopharma Holdings Inc. | 0.62% | 725,774 | $3.4M | Reduce -0.6% |
| BGC BGC Group Inc. Class A | 0.61% | 326,659 | $3.3M | Reduce -0.7% |
| GFF Griffon Corp. | 0.60% | 45,661 | $3.3M | Reduce -0.7% |
| DIS The Walt Disney Co. filed as DISNEY WALT CO | 0.60% | 26,458 | $3.3M | Reduce -5.4% |
| STXS Stereotaxis Inc. | 0.60% | 1,544,756 | $3.3M | Reduce -0.7% |
| TRNS Transcat Inc. | 0.59% | 37,714 | $3.2M | Reduce -0.7% |
| ASML ASML Holding NV-NY Reg SHS | 0.59% | 4,027 | $3.2M | Reduce -4.1% |
| PENG Penguin Solutions Inc. | 0.59% | 162,516 | $3.2M | Reduce -0.7% |
| GMED Globus Medical Inc. Class A | 0.59% | 54,536 | $3.2M | Reduce -2.6% |
| ARLO Arlo Technologies Inc. | 0.58% | 186,716 | $3.2M | Reduce -0.7% |
| CGNT Cognyte Software Ltd. | 0.57% | 340,470 | $3.1M | Reduce -0.7% |
| CVLG Covenant Logistics Group Inc. | 0.57% | 129,895 | $3.1M | Add +24.3% |
| IEX Idex Corp. | 0.57% | 17,831 | $3.1M | Reduce -16.3% |
| RDCM Radcom Ltd. | 0.56% | 225,719 | $3.1M | Reduce -0.6% |
| PAY Paymentus Holdings Inc. Class A | 0.55% | 91,983 | $3.0M | Reduce -37.4% |
| INTU Intuit Inc. | 0.55% | 3,814 | $3.0M | Reduce -1.8% |
| RRC Range Resources Corp. | 0.54% | 72,868 | $3.0M | Reduce -6.9% |
| NVRI Enviri Corp. | 0.54% | 340,846 | $3.0M | Reduce -0.7% |
| RDVT Red Violet Inc. | 0.53% | 59,202 | $2.9M | Reduce -0.7% |
| PHR Phreesia Inc. | 0.52% | 101,230 | $2.9M | Reduce -0.7% |
| EVR Evercore Inc. Class A | 0.52% | 10,561 | $2.9M | Reduce -0.7% |
| MDWD Mediwound Ltd. | 0.52% | 146,808 | $2.8M | Reduce -0.7% |
| COHU Cohu Inc. | 0.51% | 146,733 | $2.8M | New |
| MTRX Matrix Service Co. | 0.50% | 205,496 | $2.8M | Reduce -0.7% |
| MAMA Mama's Creations Inc. | 0.50% | 331,927 | $2.8M | New |
| EXTR Extreme Networks Inc. | 0.50% | 153,300 | $2.8M | Reduce -0.6% |
| ORN Orion Group Holdings Inc. | 0.50% | 300,287 | $2.7M | New |
| BKSY Blacksky Technology Inc. | 0.49% | 132,217 | $2.7M | New |
| PBPB Potbelly Corp. | 0.49% | 220,446 | $2.7M | Reduce -0.7% |
| AIP Arteris Inc. | 0.49% | 282,003 | $2.7M | Reduce -0.7% |
| ARQT Arcutis Biotherapeutics Inc. | 0.48% | 189,511 | $2.7M | Reduce -0.6% |
| PAYX Paychex Inc. | 0.47% | 17,886 | $2.6M | Reduce -1.5% |
| NOVT Novanta Inc. | 0.47% | 20,111 | $2.6M | Reduce -0.7% |
| CRNT Ceragon Networks Ltd. | 0.46% | 1,036,139 | $2.5M | Reduce -0.7% |
| TTI Tetra Technologies Inc. | 0.46% | 751,809 | $2.5M | Reduce -0.7% |
| ASPN Aspen Aerogels Inc. | 0.46% | 426,528 | $2.5M | Add +83.3% |
| KMDA Kamada Ltd. | 0.46% | 323,832 | $2.5M | New |
| BKR Baker Hughes Co. | 0.45% | 64,952 | $2.5M | Reduce -5.2% |
| LQDT Liquidity Services Inc. | 0.45% | 104,912 | $2.5M | Reduce -0.7% |
| ONT Onterris Inc. filed as MONTROSE ENVIRONMENTAL GROUP | 0.43% | 108,414 | $2.4M | Reduce -0.7% |
| LZ Legalzoomcom Inc. | 0.43% | 264,801 | $2.4M | New |
| ECG Everus Construction Group | 0.43% | 36,943 | $2.3M | Reduce -0.6% |
| PRCT Procept Biorobotics Corp. | 0.42% | 40,298 | $2.3M | Reduce -0.6% |
| ANGO Angiodynamics Inc. | 0.42% | 230,757 | $2.3M | Add +28.8% |
| SMTC Semtech Corp. | 0.40% | 49,140 | $2.2M | Reduce -0.7% |
| CTM Castellum Inc. | 0.40% | 2,090,500 | $2.2M | New |
Portfolio Sells Q1 2025 → Q2 2025
| ITCI Intra-Cellular Therapies Inc. | Sold out | 0.00% | −1.37 |
| TVTX Travere Therapeutics Inc. | Sold out | 0.00% | −0.95 |
| GNRC Generac Holdings Inc. | Sold out | 0.00% | −0.81 |
| HCI Hci Group Inc. | Reduce -23.0% | 1.66% | −0.76 |
| MYO Myomo Inc. | Reduce -74.6% | 0.08% | −0.71 |
| BMRC Bank of Marin Bancorp | Sold out | 0.00% | −0.61 |
| PFE Pfizer Inc. | Sold out | 0.00% | −0.60 |
| TILE Interface Inc. | Sold out | 0.00% | −0.59 |
| TARS Tarsus Pharmaceuticals Inc. | Sold out | 0.00% | −0.58 |
| NEE Nextera Energy Inc. | Reduce -25.1% | 1.00% | −0.57 |
| GWRE Guidewire Software Inc. | Reduce -40.1% | 1.00% | −0.52 |
| RVLV Revolve Group Inc. Class A | Sold out | 0.00% | −0.49 |
| FTDR Frontdoor Inc. | Sold out | 0.00% | −0.47 |
| QDEL Quidelortho Corp. | Sold out | 0.00% | −0.46 |
| EOLS Evolus Inc. | Sold out | 0.00% | −0.45 |
| GDYN Grid Dynamics Holdings Inc. | Sold out | 0.00% | −0.45 |
| NVCR Novocure Ltd. | Sold out | 0.00% | −0.45 |
| LUNG Pulmonx Corp. | Sold out | 0.00% | −0.43 |
| AIOT Powerfleet Inc. | Sold out | 0.00% | −0.41 |
| AAPL Apple Inc. | Reduce -2.4% | 1.37% | −0.37 |
| FWRD Forward Air Corp. | Sold out | 0.00% | −0.32 |
| HASI Ha Sustainable Infrastructur | Sold out | 0.00% | −0.30 |
| GMED Globus Medical Inc. Class A | Reduce -2.6% | 0.59% | −0.27 |
| HUBB Hubbell Inc. | Sold out | 0.00% | −0.26 |
| GTLS Chart Industries Inc. | Sold out | 0.00% | −0.26 |
| ERII Energy Recovery Inc. | Reduce -18.8% | 0.34% | −0.26 |
| PAY Paymentus Holdings Inc. Class A | Reduce -37.4% | 0.55% | −0.25 |
| VMI Valmont Industries | Reduce -51.3% | 0.23% | −0.24 |
| IEX Idex Corp. | Reduce -16.3% | 0.57% | −0.23 |
| LQDT Liquidity Services Inc. | Reduce -0.7% | 0.45% | −0.23 |
| MP MP Materials Corp. | Reduce -66.9% | 0.15% | −0.23 |
| XERS Xeris Biopharma Holdings Inc. | Reduce -0.6% | 0.62% | −0.22 |
| IAS Integral Ad Science Holding | Sold out | 0.00% | −0.22 |
| NPCE Neuropace Inc. | Reduce -46.8% | 0.15% | −0.21 |
| BMI Badger Meter Inc. | Reduce -42.9% | 0.35% | −0.20 |
| SG Sweetgreen Inc. Class A | Reduce -0.7% | 0.21% | −0.19 |
| BKR Baker Hughes Co. | Reduce -5.2% | 0.45% | −0.18 |
| CRM Salesforce Inc. | Reduce -2.2% | 0.97% | −0.15 |
| ARQT Arcutis Biotherapeutics Inc. | Reduce -0.6% | 0.48% | −0.14 |
| LYTS Lsi Industries Inc. | Reduce -0.7% | 0.82% | −0.13 |
| NUTX Nutex Health Inc. | Reduce -62.9% | 0.73% | −0.12 |
| WMS Advanced Drainage Systems Inc. | Reduce -31.2% | 0.20% | −0.12 |
| RRC Range Resources Corp. | Reduce -6.9% | 0.54% | −0.11 |
| PAYX Paychex Inc. | Reduce -1.5% | 0.47% | −0.11 |
| KELYA Kelly Services Inc. Class A | Reduce -0.6% | 0.36% | −0.11 |
| CLPT Clearpoint Neuro Inc. | Reduce -0.6% | 0.71% | −0.11 |
| TRMB Trimble Inc. | Reduce -31.4% | 0.23% | −0.10 |
| VLTO Veralto Corp. | Reduce -31.2% | 0.17% | −0.10 |
| LGND Ligand Pharmaceuticals | Reduce -1.4% | 1.26% | −0.10 |
| GFF Griffon Corp. | Reduce -0.7% | 0.60% | −0.08 |
Portfolio Buys Q1 2025 → Q2 2025
| MIRM Mirum Pharmaceuticals Inc. | New | 1.04% | +1.04 |
| GEV GE Vernova Inc. | Add +93.8% | 1.39% | +0.92 |
| COHU Cohu Inc. | New | 0.51% | +0.51 |
| MAMA Mama's Creations Inc. | New | 0.50% | +0.50 |
| ORN Orion Group Holdings Inc. | New | 0.50% | +0.50 |
| BKSY Blacksky Technology Inc. | New | 0.49% | +0.49 |
| KMDA Kamada Ltd. | New | 0.46% | +0.46 |
| LZ Legalzoomcom Inc. | New | 0.43% | +0.43 |
| CTM Castellum Inc. | New | 0.40% | +0.40 |
| ULBI Ultralife Corp. | New | 0.39% | +0.39 |
| RVSB Riverview Bancorp Inc. | New | 0.38% | +0.38 |
| OII Oceaneering Intl Inc. | New | 0.38% | +0.38 |
| FEIM Frequency Electronics Inc. | New | 0.37% | +0.37 |
| DLTR Dollar Tree Inc. | Add +108.3% | 0.62% | +0.36 |
| AISP Airship AI Holdings Inc. | New | 0.33% | +0.33 |
| TEM Tempus AI Inc. Class A | Add +7534.3% | 0.32% | +0.32 |
| INFU Infusystem Holdings Inc. | New | 0.31% | +0.31 |
| DERM Journey Medical Corp. | New | 0.30% | +0.30 |
| BWXT BWX Technologies Inc. | Add +30.7% | 0.74% | +0.29 |
| DSP Viant Technology Inc. Class A | New | 0.29% | +0.29 |
| HVT Haverty Furniture | New | 0.27% | +0.27 |
| AMPX Amprius Technologies Inc. | Add +9.6% | 0.78% | +0.26 |
| TSEM Tower Semiconductor Ltd. | Add +12.8% | 1.54% | +0.25 |
| CON Concentra Group Holdings Par | Add +80.0% | 0.67% | +0.22 |
| PEGA Pegasystems Inc. | Add +95.9% | 0.81% | +0.20 |
| ASPN Aspen Aerogels Inc. | Add +83.3% | 0.46% | +0.15 |
| GS Goldman Sachs Group Inc. | Add +0.6% | 1.18% | +0.14 |
| ON On Semiconductor | New | 0.13% | +0.13 |
| CPRT Copart Inc. | New | 0.12% | +0.12 |
| EVER Everquote Inc. Class A | Add +40.6% | 1.03% | +0.12 |
| YASKAWA ELEC CORP | New | 0.11% | +0.11 |
| CVLG Covenant Logistics Group Inc. | Add +24.3% | 0.57% | +0.09 |
| IOT Samsara Inc. Class A | New | 0.08% | +0.08 |
| ANGO Angiodynamics Inc. | Add +28.8% | 0.42% | +0.07 |
| CPSH CPS Technologies Corp. | New | 0.04% | +0.04 |
| OWLT Owlet Inc. | Add +12.3% | 0.04% | +0.02 |
| CGNX Cognex Corp. | Add +22.4% | 0.20% | +0.02 |
| DAIO Data I/O Corp. | Add +70.8% | 0.04% | +0.02 |
| NEPH Nephros Inc. | New | 0.02% | +0.02 |
| GSIT Gsi Technology Inc. | Add +43.0% | 0.03% | +0.02 |
| BWEN Broadwind Inc. | Add +56.0% | 0.03% | +0.01 |
| AMPG Amplitech Group Inc. | Add +18.1% | 0.03% | +0.01 |
| RGLD Royal Gold Inc. | Add +48.9% | 0.01% | +0.00 |
| ANGI Angi Inc. | New | 0.00% | +0.00 |
| ALKT Alkami Technology Inc. | Add +31.7% | 0.01% | +0.00 |
| FLS Flowserve Corp. | Add +16.4% | 0.01% | +0.00 |
| FNV Franco-Nevada Corp. | Add +6.4% | 0.09% | −0.00 |
| BYDDY BYD Co. Ltd.-Unsponsored ADR | Add +9.7% | 0.06% | −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 |