Essex Investment Management Co. LLC
In its 13F for Q1 2025 (holdings as of March 31, 2025, filed May 7, 2025), Essex Investment Management Co. LLC reported 303 stock positions worth $479.4 million. Its top holding was Hci (HCI) at 2.4% of the portfolio, followed by Kratos Defense & Security (KTOS, 2.2%) and Leonardo DRS (DRS, 1.8%). Compared with Q4 2024, it opened 27 new positions, sold out of 31, added to 31 and reduced 155. The biggest buy was a new position in Travere Therapeutics (TVTX) and the biggest sale Primoris Services (PRIM, shares −57%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0000201772
- Portfolio Value
- $479.4M (Q1 2025)
- SEC Filing
- 0000201772-25-000005 ↗ filed May 7, 2025
Holdings Value
Holdings 303 stocks · $479.4M
| HCI Hci Group Inc. | 2.42% | 77,870 | $11.6M | Reduce -5.4% |
| KTOS Kratos Defense & Security | 2.20% | 354,667 | $10.5M | Reduce -3.6% |
| DRS Leonardo DRS Inc. | 1.75% | 255,859 | $8.4M | Reduce -0.8% |
| AAPL Apple Inc. | 1.74% | 37,556 | $8.3M | Reduce -9.8% |
| NEE Nextera Energy Inc. | 1.57% | 106,191 | $7.5M | Reduce -10.2% |
| AVPT Avepoint Inc. | 1.57% | 519,629 | $7.5M | Reduce -4.8% |
| GWRE Guidewire Software Inc. | 1.52% | 38,831 | $7.3M | Reduce -10.7% |
| MSFT Microsoft Corp. | 1.47% | 18,808 | $7.1M | Reduce -8.8% |
| AMSC American Superconductor Corp. | 1.41% | 372,221 | $6.8M | Reduce -13.4% |
| ITCI Intra-Cellular Therapies Inc. | 1.37% | 49,717 | $6.6M | Reduce -12.7% |
| LGND Ligand Pharmaceuticals | 1.35% | 61,702 | $6.5M | Reduce -5.4% |
| TSEM Tower Semiconductor Ltd. | 1.29% | 173,059 | $6.2M | Reduce -5.6% |
| LINC Lincoln Educational Services | 1.28% | 387,346 | $6.1M | Reduce -3.1% |
| STRL Sterling Infrastructure Inc. | 1.27% | 53,925 | $6.1M | Add +43.1% |
| AMZN Amazon.com Inc. | 1.20% | 30,287 | $5.8M | Reduce -9.6% |
| WLDN Willdan Group Inc. | 1.16% | 137,090 | $5.6M | Reduce -0.7% |
| CRM Salesforce Inc. | 1.12% | 19,940 | $5.4M | Reduce -9.4% |
| INSM Insmed Inc. | 1.06% | 66,800 | $5.1M | Reduce -0.8% |
| GS Goldman Sachs Group Inc. | 1.04% | 9,092 | $5.0M | Reduce -7.3% |
| AGX Argan Inc. | 0.99% | 36,210 | $4.7M | Reduce -0.8% |
| ADPT Adaptive Biotechnologies | 0.96% | 621,712 | $4.6M | Reduce -0.7% |
| AEM Agnico Eagle Mines Ltd. | 0.96% | 42,322 | $4.6M | Reduce -6.9% |
| TVTX Travere Therapeutics Inc. | 0.95% | 254,666 | $4.6M | New |
| LYTS Lsi Industries Inc. | 0.95% | 268,145 | $4.6M | Reduce -0.7% |
| MIR Mirion Technologies Inc. | 0.91% | 301,873 | $4.4M | Reduce -0.8% |
| EVER Everquote Inc. Class A | 0.91% | 166,929 | $4.4M | Reduce -7.7% |
| AMBA Ambarella Inc. | 0.91% | 86,431 | $4.4M | Reduce -4.5% |
| UVE Universal Insurance Holdings | 0.87% | 176,674 | $4.2M | Reduce -0.8% |
| NUTX Nutex Health Inc. | 0.86% | 87,223 | $4.1M | Reduce -17.6% |
| GMED Globus Medical Inc. Class A | 0.85% | 55,977 | $4.1M | Reduce -12.5% |
| GHM Graham Corp. | 0.84% | 139,857 | $4.0M | Reduce -0.6% |
| XERS Xeris Biopharma Holdings Inc. | 0.84% | 730,444 | $4.0M | Add +53.8% |
| PATK Patrick Industries Inc. | 0.82% | 46,491 | $3.9M | Reduce -4.0% |
| CLPT Clearpoint Neuro Inc. | 0.81% | 327,459 | $3.9M | Reduce -19.9% |
| GNRC Generac Holdings Inc. | 0.81% | 30,615 | $3.9M | Reduce -11.8% |
| IEX Idex Corp. | 0.80% | 21,301 | $3.9M | Reduce -10.9% |
| KNSA Kiniksa Pharmaceuticals Inte | 0.80% | 172,666 | $3.8M | Reduce -0.7% |
| PAY Paymentus Holdings Inc. Class A | 0.80% | 146,872 | $3.8M | Reduce -0.6% |
| MYO Myomo Inc. | 0.79% | 787,615 | $3.8M | Reduce -0.8% |
| BPMC Blueprint Medicines Corp. | 0.77% | 41,525 | $3.7M | Reduce -9.2% |
| PRIM Primoris Services Corp. | 0.75% | 62,671 | $3.6M | Reduce -57.2% |
| CXDO Crexendo Inc. | 0.74% | 727,057 | $3.5M | Reduce -0.8% |
| CECO Ceco Environmental Corp. | 0.73% | 153,846 | $3.5M | Reduce -0.8% |
| STKL Sunopta Inc. | 0.71% | 703,140 | $3.4M | Reduce -3.5% |
| OSPN Onespan Inc. | 0.71% | 221,899 | $3.4M | Reduce -0.8% |
| GFF Griffon Corp. | 0.69% | 45,974 | $3.3M | Reduce -0.8% |
| LQDT Liquidity Services Inc. | 0.68% | 105,669 | $3.3M | Reduce -0.8% |
| THC Tenet Healthcare Corp. | 0.67% | 23,911 | $3.2M | Add +9.3% |
| RRC Range Resources Corp. | 0.65% | 78,247 | $3.1M | Add +7072.0% |
| MRC MRC Global Inc. | 0.64% | 266,717 | $3.1M | Reduce -0.7% |
| BGC BGC Group Inc. Class A | 0.63% | 328,899 | $3.0M | Reduce -0.8% |
| BKR Baker Hughes Co. | 0.63% | 68,515 | $3.0M | New |
| ARQT Arcutis Biotherapeutics Inc. | 0.62% | 190,638 | $3.0M | Add +33.5% |
| BMRC Bank of Marin Bancorp filed as BANK MARIN BANCORP | 0.61% | 132,943 | $2.9M | New |
| SIBN Si-Bone Inc. | 0.61% | 207,900 | $2.9M | Reduce -0.1% |
| PEGA Pegasystems Inc. | 0.61% | 41,847 | $2.9M | Reduce -8.8% |
| PFE Pfizer Inc. | 0.60% | 114,116 | $2.9M | Reduce -10.0% |
| BWAY Brainsway Ltd.-ADR | 0.60% | 303,165 | $2.9M | Reduce -0.8% |
| ERII Energy Recovery Inc. | 0.60% | 179,564 | $2.9M | Reduce -18.1% |
| PENG Penguin Solutions Inc. | 0.59% | 163,573 | $2.8M | New |
| TILE Interface Inc. | 0.59% | 142,578 | $2.8M | Reduce -0.8% |
| TRNS Transcat Inc. | 0.59% | 37,987 | $2.8M | Reduce -0.8% |
| OCUL Ocular Therapeutix Inc. | 0.59% | 384,325 | $2.8M | Reduce -0.8% |
| PAYX Paychex Inc. | 0.58% | 18,158 | $2.8M | Reduce -4.8% |
| TARS Tarsus Pharmaceuticals Inc. | 0.58% | 54,447 | $2.8M | Reduce -31.7% |
| ASML ASML Holding NV-NY Reg SHS | 0.58% | 4,199 | $2.8M | New |
| DIS The Walt Disney Co. filed as DISNEY WALT CO | 0.58% | 27,955 | $2.8M | Reduce -10.4% |
| STXS Stereotaxis Inc. | 0.57% | 1,556,094 | $2.7M | Add +28.3% |
| CGNT Cognyte Software Ltd. | 0.56% | 342,932 | $2.7M | Reduce -0.8% |
| BMI Badger Meter Inc. | 0.55% | 13,798 | $2.6M | Reduce -13.1% |
| GLDD Great Lakes Dredge & Dock Co. | 0.55% | 300,821 | $2.6M | Reduce -0.7% |
| PHR Phreesia Inc. | 0.54% | 101,924 | $2.6M | Reduce -0.8% |
| RDCM Radcom Ltd. | 0.54% | 227,147 | $2.6M | Reduce -0.9% |
| NOVT Novanta Inc. | 0.54% | 20,258 | $2.6M | Reduce -0.8% |
| MTRX Matrix Service Co. | 0.54% | 206,985 | $2.6M | Reduce -0.7% |
| ZS Zscaler Inc. | 0.53% | 12,913 | $2.6M | Reduce -9.0% |
| TTI Tetra Technologies Inc. | 0.53% | 757,252 | $2.5M | Reduce -0.6% |
| AMPX Amprius Technologies Inc. | 0.52% | 935,815 | $2.5M | New |
| CRNT Ceragon Networks Ltd. | 0.51% | 1,043,416 | $2.5M | Reduce -5.4% |
| OUST Ouster Inc. | 0.50% | 266,764 | $2.4M | Reduce -3.1% |
| INTU Intuit Inc. | 0.50% | 3,883 | $2.4M | Reduce -7.3% |
| RVLV Revolve Group Inc. Class A | 0.49% | 110,322 | $2.4M | Reduce -3.5% |
| PRCT Procept Biorobotics Corp. | 0.49% | 40,531 | $2.4M | Reduce -21.6% |
| OLO Olo Inc. Class A | 0.49% | 390,441 | $2.4M | Reduce -0.8% |
| CVLG Covenant Logistics Group Inc. | 0.48% | 104,543 | $2.3M | Reduce -0.8% |
| MDWD Mediwound Ltd. | 0.48% | 147,868 | $2.3M | Reduce -0.7% |
| NVRI Enviri Corp. | 0.48% | 343,309 | $2.3M | Reduce -0.7% |
| GEV GE Vernova Inc. | 0.48% | 7,475 | $2.3M | Reduce -35.5% |
| VMI Valmont Industries | 0.47% | 7,960 | $2.3M | Reduce -13.1% |
| FTDR Frontdoor Inc. | 0.47% | 58,703 | $2.3M | Reduce -0.8% |
| KELYA Kelly Services Inc. Class A | 0.47% | 170,261 | $2.2M | Add +143.9% |
| RDVT Red Violet Inc. | 0.47% | 59,629 | $2.2M | Reduce -0.8% |
| QDEL Quidelortho Corp. | 0.46% | 63,315 | $2.2M | Reduce -0.8% |
| EOLS Evolus Inc. | 0.45% | 181,134 | $2.2M | Reduce -0.8% |
| SMWB Similarweb Ltd. | 0.45% | 262,814 | $2.2M | Reduce -0.8% |
| GDYN Grid Dynamics Holdings Inc. | 0.45% | 138,742 | $2.2M | Reduce -0.7% |
| NVCR Novocure Ltd. | 0.45% | 121,040 | $2.2M | Reduce -0.7% |
| MASS 908 Devices Inc. | 0.45% | 480,549 | $2.2M | New |
| CON Concentra Group Holdings Par | 0.45% | 99,127 | $2.2M | Reduce -8.7% |
| EVR Evercore Inc. Class A | 0.44% | 10,634 | $2.1M | Reduce -0.8% |
Portfolio Sells Q4 2024 → Q1 2025
| PRIM Primoris Services Corp. | Reduce -57.2% | 0.75% | −1.26 |
| BP BP PLC-Spons ADR | Reduce -99.5% | 0.00% | −0.75 |
| TBCH Turtle Beach Corp. | Sold out | 0.00% | −0.64 |
| RCEL Avita Medical Inc. | Sold out | 0.00% | −0.60 |
| XOM Exxon Mobil Corp. | Reduce -95.6% | 0.03% | −0.52 |
| AMSC American Superconductor Corp. | Reduce -13.4% | 1.41% | −0.50 |
| DAWN Day One Biopharmaceuticals I | Sold out | 0.00% | −0.47 |
| LGTY Logility Supply Chain Soluti | Sold out | 0.00% | −0.47 |
| SEM Select Medical Holdings Corp. | Sold out | 0.00% | −0.45 |
| CRNT Ceragon Networks Ltd. | Reduce -5.4% | 0.51% | −0.41 |
| TSEM Tower Semiconductor Ltd. | Reduce -5.6% | 1.29% | −0.41 |
| AQST Aquestive Therapeutics Inc. | Sold out | 0.00% | −0.40 |
| FOLD Amicus Therapeutics Inc. | Sold out | 0.00% | −0.39 |
| PHLT Performant Healthcare Inc. | Sold out | 0.00% | −0.38 |
| HCAT Health Catalyst Inc. | Sold out | 0.00% | −0.38 |
| SHYF The Shyft Group Inc. | Sold out | 0.00% | −0.34 |
| TTEK Tetra Tech Inc. | Sold out | 0.00% | −0.32 |
| CLPT Clearpoint Neuro Inc. | Reduce -19.9% | 0.81% | −0.32 |
| STKL Sunopta Inc. | Reduce -3.5% | 0.71% | −0.30 |
| MYGN Myriad Genetics Inc. | Sold out | 0.00% | −0.29 |
| GHM Graham Corp. | Reduce -0.6% | 0.84% | −0.28 |
| AMBA Ambarella Inc. | Reduce -4.5% | 0.91% | −0.28 |
| MEI Methode Electronics Inc. | Sold out | 0.00% | −0.26 |
| PRCT Procept Biorobotics Corp. | Reduce -21.6% | 0.49% | −0.26 |
| ALB Albemarle Corp. | Sold out | 0.00% | −0.24 |
| SMWB Similarweb Ltd. | Reduce -0.8% | 0.45% | −0.22 |
| ASPN Aspen Aerogels Inc. | Reduce -6.3% | 0.31% | −0.22 |
| TARS Tarsus Pharmaceuticals Inc. | Reduce -31.7% | 0.58% | −0.21 |
| GEV GE Vernova Inc. | Reduce -35.5% | 0.48% | −0.21 |
| CRM Salesforce Inc. | Reduce -9.4% | 1.12% | −0.21 |
| NVCR Novocure Ltd. | Reduce -0.7% | 0.45% | −0.20 |
| CSTE Caesarstone Ltd. | Reduce -66.0% | 0.06% | −0.20 |
| RVLV Revolve Group Inc. Class A | Reduce -3.5% | 0.49% | −0.19 |
| XYL Xylem Inc. | Reduce -49.9% | 0.28% | −0.19 |
| ZETA Zeta Global Holdings Corp. Class A | Reduce -22.9% | 0.34% | −0.16 |
| PEGA Pegasystems Inc. | Reduce -8.8% | 0.61% | −0.16 |
| CGNX Cognex Corp. | Reduce -46.3% | 0.17% | −0.16 |
| GNRC Generac Holdings Inc. | Reduce -11.8% | 0.81% | −0.16 |
| ENVX Enovix Corp. | Sold out | 0.00% | −0.16 |
| DCBO Docebo Inc. | Reduce -0.7% | 0.42% | −0.15 |
| TRNS Transcat Inc. | Reduce -0.8% | 0.59% | −0.14 |
| AAPL Apple Inc. | Reduce -9.8% | 1.74% | −0.13 |
| MYO Myomo Inc. | Reduce -0.8% | 0.79% | −0.13 |
| FWRD Forward Air Corp. | Reduce -0.7% | 0.32% | −0.13 |
| RSSS Research Solutions Inc. | Reduce -0.7% | 0.32% | −0.12 |
| ACVA Acv Auctions Inc. Class A | Reduce -0.7% | 0.37% | −0.12 |
| AMZN Amazon.com Inc. | Reduce -9.6% | 1.20% | −0.12 |
| AIP Arteris Inc. | Reduce -0.8% | 0.41% | −0.12 |
| FTDR Frontdoor Inc. | Reduce -0.8% | 0.47% | −0.11 |
| CECO Ceco Environmental Corp. | Reduce -0.8% | 0.73% | −0.11 |
Portfolio Buys Q4 2024 → Q1 2025
| TVTX Travere Therapeutics Inc. | New | 0.95% | +0.95 |
| RRC Range Resources Corp. | Add +7072.0% | 0.65% | +0.64 |
| BKR Baker Hughes Co. | New | 0.63% | +0.63 |
| BMRC Bank of Marin Bancorp | New | 0.61% | +0.61 |
| PENG Penguin Solutions Inc. | New | 0.59% | +0.59 |
| ASML ASML Holding NV-NY Reg SHS | New | 0.58% | +0.58 |
| XERS Xeris Biopharma Holdings Inc. | Add +53.8% | 0.84% | +0.55 |
| AMPX Amprius Technologies Inc. | New | 0.52% | +0.52 |
| MASS 908 Devices Inc. | New | 0.45% | +0.45 |
| PBPB Potbelly Corp. | New | 0.44% | +0.44 |
| LUNG Pulmonx Corp. | New | 0.43% | +0.43 |
| AIOT Powerfleet Inc. | New | 0.41% | +0.41 |
| FVRR Fiverr International Ltd. | New | 0.36% | +0.36 |
| SMTC Semtech Corp. | New | 0.36% | +0.36 |
| NPCE Neuropace Inc. | New | 0.35% | +0.35 |
| ANGO Angiodynamics Inc. | New | 0.35% | +0.35 |
| KELYA Kelly Services Inc. Class A | Add +143.9% | 0.47% | +0.29 |
| IBEX Ibex Ltd. | New | 0.29% | +0.29 |
| VLTO Veralto Corp. | New | 0.27% | +0.27 |
| ARQT Arcutis Biotherapeutics Inc. | Add +33.5% | 0.62% | +0.26 |
| DE Deere & Co. | New | 0.21% | +0.21 |
| THC Tenet Healthcare Corp. | Add +9.3% | 0.67% | +0.17 |
| DLTR Dollar Tree Inc. | Add +96.0% | 0.26% | +0.15 |
| STRL Sterling Infrastructure Inc. | Add +43.1% | 1.27% | +0.13 |
| FSLR First Solar Inc. | Add +85.8% | 0.35% | +0.12 |
| AJG Arthur J Gallagher & Co. | Add +0.2% | 0.28% | +0.08 |
| STXS Stereotaxis Inc. | Add +28.3% | 0.57% | +0.07 |
| BYDDY BYD Co. Ltd.-Unsponsored ADR | New | 0.07% | +0.07 |
| IWO iShares Russell 2000 Growth | Add +200.8% | 0.08% | +0.05 |
| WMS Advanced Drainage Systems Inc. | Add +10.3% | 0.32% | +0.05 |
| PG The Procter & Gamble Co. | Add +0.0% | 0.34% | +0.05 |
| CL Colgate-Palmolive Co. | Add +0.1% | 0.22% | +0.04 |
| RPID Rapid Micro Biosystems Inc. Class A | New | 0.03% | +0.03 |
| KO The Coca-Cola Co. | Add +0.1% | 0.13% | +0.03 |
| VZ Verizon Communications Inc. | Add +0.1% | 0.13% | +0.03 |
| FSI Flexible Solutions Intl Inc. | New | 0.03% | +0.03 |
| NXGL Nexgel Inc. | New | 0.02% | +0.02 |
| PEP Pepsico Inc. | Add +0.1% | 0.18% | +0.02 |
| AMPG Amplitech Group Inc. | New | 0.02% | +0.02 |
| ECG Everus Construction Group | Add +63.4% | 0.29% | +0.02 |
| RIVN Rivian Automotive Inc. Class A | Add +5.4% | 0.13% | +0.02 |
| CNVS Cineverse Corp. | New | 0.01% | +0.01 |
| GSIT Gsi Technology Inc. | New | 0.01% | +0.01 |
| AXP American Express Co. | Add +0.2% | 0.23% | +0.01 |
| SIDU Sidus Space Inc. Class A | New | 0.01% | +0.01 |
| GNSS Genasys Inc. | Add +29.8% | 0.03% | +0.01 |
| ADP Automatic Data Processing | Add +0.4% | 0.05% | +0.01 |
| NINEQ Nine Energy Service Inc. | Add +11.8% | 0.03% | +0.01 |
| FTEK Fuel Tech Inc. | Add +11.8% | 0.03% | +0.01 |
| IFNNY Infineon Technologies-ADR | New | 0.00% | +0.00 |
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 |