Essex Investment Management Co. LLC
In its 13F for Q4 2024 (holdings as of December 31, 2024, filed February 7, 2025), Essex Investment Management Co. LLC reported 307 stock positions worth $556.1 million. Its top holding was Primoris Services (PRIM) at 2.0% of the portfolio, followed by American Superconductor (AMSC, 1.9%) and Apple (AAPL, 1.9%). Compared with Q3 2024, it opened 19 new positions, sold out of 15, added to 37 and reduced 172. The biggest buy was Idex (IEX, shares +28356%) and the biggest sale Zeta Global Class A (ZETA, shares −49%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0000201772
- Portfolio Value
- $556.1M (Q4 2024)
- SEC Filing
- 0000201772-25-000001 ↗ filed Feb 7, 2025
Holdings Value
Holdings 307 stocks · $556.1M
| PRIM Primoris Services Corp. | 2.01% | 146,371 | $11.2M | Reduce -1.8% |
| AMSC American Superconductor Corp. | 1.90% | 429,876 | $10.6M | Reduce -7.5% |
| AAPL Apple Inc. | 1.88% | 41,640 | $10.4M | Reduce -1.4% |
| KTOS Kratos Defense & Security | 1.75% | 368,108 | $9.7M | Reduce -8.6% |
| HCI Hci Group Inc. | 1.73% | 82,335 | $9.6M | Reduce -7.0% |
| TSEM Tower Semiconductor Ltd. | 1.70% | 183,392 | $9.4M | Add +2.1% |
| AVPT Avepoint Inc. | 1.62% | 545,745 | $9.0M | Reduce -7.9% |
| MSFT Microsoft Corp. | 1.56% | 20,626 | $8.7M | Reduce -2.4% |
| NEE Nextera Energy Inc. | 1.52% | 118,191 | $8.5M | Add +6.4% |
| DRS Leonardo DRS Inc. | 1.50% | 257,807 | $8.3M | Reduce -31.3% |
| CRM Salesforce Inc. | 1.32% | 22,000 | $7.4M | Reduce -2.0% |
| AMZN Amazon.com Inc. | 1.32% | 33,490 | $7.3M | Reduce -1.6% |
| GWRE Guidewire Software Inc. | 1.32% | 43,487 | $7.3M | Reduce -3.9% |
| LGND Ligand Pharmaceuticals | 1.26% | 65,247 | $7.0M | Reduce -5.6% |
| AMBA Ambarella Inc. | 1.18% | 90,522 | $6.6M | Add +6.0% |
| STRL Sterling Infrastructure Inc. | 1.14% | 37,683 | $6.3M | Reduce -16.2% |
| LINC Lincoln Educational Services | 1.14% | 399,640 | $6.3M | Reduce -9.9% |
| CLPT Clearpoint Neuro Inc. | 1.13% | 408,822 | $6.3M | Reduce -11.9% |
| GHM Graham Corp. | 1.13% | 140,716 | $6.3M | Reduce -26.0% |
| GS Goldman Sachs Group Inc. | 1.01% | 9,811 | $5.6M | Add +3.5% |
| STKL Sunopta Inc. | 1.01% | 728,311 | $5.6M | Reduce -10.2% |
| GNRC Generac Holdings Inc. | 0.97% | 34,709 | $5.4M | Reduce -0.7% |
| MIR Mirion Technologies Inc. | 0.95% | 304,255 | $5.3M | Reduce -13.4% |
| GMED Globus Medical Inc. Class A | 0.95% | 63,945 | $5.3M | Reduce -3.1% |
| WLDN Willdan Group Inc. | 0.95% | 138,007 | $5.3M | Reduce -11.4% |
| LYTS Lsi Industries Inc. | 0.94% | 269,911 | $5.2M | Reduce -11.9% |
| CRNT Ceragon Networks Ltd. | 0.93% | 1,102,599 | $5.1M | Reduce -11.9% |
| MYO Myomo Inc. | 0.92% | 793,697 | $5.1M | Reduce -11.7% |
| IEX Idex Corp. | 0.90% | 23,903 | $5.0M | Add +28356.0% |
| AGX Argan Inc. | 0.90% | 36,490 | $5.0M | Reduce -26.4% |
| PAY Paymentus Holdings Inc. Class A | 0.87% | 147,816 | $4.8M | Reduce -29.7% |
| ITCI Intra-Cellular Therapies Inc. | 0.85% | 56,915 | $4.8M | Reduce -2.5% |
| CECO Ceco Environmental Corp. | 0.84% | 155,046 | $4.7M | Reduce -25.6% |
| INSM Insmed Inc. | 0.84% | 67,330 | $4.6M | Reduce -12.8% |
| TARS Tarsus Pharmaceuticals Inc. | 0.79% | 79,760 | $4.4M | Reduce -26.9% |
| PEGA Pegasystems Inc. | 0.77% | 45,881 | $4.3M | Add +27.1% |
| BP BP PLC-Spons ADR | 0.76% | 142,419 | $4.2M | Reduce -5.6% |
| PRCT Procept Biorobotics Corp. | 0.75% | 51,725 | $4.2M | Reduce -36.1% |
| OSPN Onespan Inc. | 0.75% | 223,612 | $4.1M | Reduce -12.7% |
| TRNS Transcat Inc. | 0.73% | 38,289 | $4.0M | Reduce -11.9% |
| PATK Patrick Industries Inc. | 0.72% | 48,432 | $4.0M | Reduce -10.4% |
| BPMC Blueprint Medicines Corp. | 0.72% | 45,736 | $4.0M | Add +29.0% |
| CXDO Crexendo Inc. | 0.69% | 732,671 | $3.8M | Reduce -11.6% |
| RVLV Revolve Group Inc. Class A | 0.69% | 114,360 | $3.8M | Reduce -13.0% |
| GEV GE Vernova Inc. | 0.69% | 11,597 | $3.8M | Add +0.2% |
| SMWB Similarweb Ltd. | 0.67% | 264,820 | $3.8M | Reduce -13.3% |
| ADPT Adaptive Biotechnologies | 0.67% | 625,838 | $3.8M | Reduce -12.9% |
| UVE Universal Insurance Holdings | 0.67% | 178,038 | $3.7M | Reduce -11.7% |
| NVCR Novocure Ltd. | 0.65% | 121,826 | $3.6M | Reduce -24.8% |
| EVER Everquote Inc. Class A | 0.65% | 180,818 | $3.6M | Reduce -16.6% |
| AEM Agnico Eagle Mines Ltd. | 0.64% | 45,441 | $3.6M | Reduce -2.1% |
| TBCH Turtle Beach Corp. | 0.64% | 204,961 | $3.5M | Reduce -11.5% |
| TILE Interface Inc. | 0.63% | 143,676 | $3.5M | Reduce -12.4% |
| DIS The Walt Disney Co. filed as DISNEY WALT CO | 0.62% | 31,211 | $3.5M | Reduce -2.0% |
| LQDT Liquidity Services Inc. | 0.62% | 106,490 | $3.4M | Reduce -11.7% |
| KNSA Kiniksa Pharmaceuticals Inte | 0.62% | 173,799 | $3.4M | Reduce -13.3% |
| MRC MRC Global Inc. | 0.62% | 268,486 | $3.4M | Reduce -10.6% |
| GLDD Great Lakes Dredge & Dock Co. | 0.62% | 303,050 | $3.4M | Reduce -12.8% |
| BMI Badger Meter Inc. | 0.61% | 15,877 | $3.4M | Add +6.2% |
| OUST Ouster Inc. | 0.61% | 275,433 | $3.4M | Add +66.7% |
| PFE Pfizer Inc. | 0.60% | 126,810 | $3.4M | Reduce -16.0% |
| NUTX Nutex Health Inc. | 0.60% | 105,809 | $3.4M | Add +45.4% |
| RCEL Avita Medical Inc. | 0.60% | 261,171 | $3.3M | Add +13.0% |
| OCUL Ocular Therapeutix Inc. | 0.59% | 387,248 | $3.3M | Reduce -12.7% |
| GFF Griffon Corp. | 0.59% | 46,336 | $3.3M | Reduce -12.3% |
| FTDR Frontdoor Inc. | 0.58% | 59,174 | $3.2M | Reduce -12.8% |
| ERII Energy Recovery Inc. | 0.58% | 219,331 | $3.2M | Reduce -7.6% |
| DCBO Docebo Inc. | 0.57% | 70,659 | $3.2M | Reduce -13.0% |
| NOVT Novanta Inc. | 0.56% | 20,411 | $3.1M | Reduce -12.7% |
| GDYN Grid Dynamics Holdings Inc. | 0.56% | 139,676 | $3.1M | New |
| XOM Exxon Mobil Corp. | 0.55% | 28,268 | $3.0M | Reduce -0.7% |
| OLO Olo Inc. Class A | 0.54% | 393,395 | $3.0M | Reduce -12.7% |
| BGC BGC Group Inc. Class A | 0.54% | 331,533 | $3.0M | Add +5.9% |
| CGNT Cognyte Software Ltd. | 0.54% | 345,520 | $3.0M | Reduce -11.3% |
| EVR Evercore Inc. Class A | 0.53% | 10,721 | $3.0M | Reduce -13.6% |
| ASPN Aspen Aerogels Inc. | 0.53% | 248,243 | $2.9M | Add +15.1% |
| SIBN Si-Bone Inc. | 0.52% | 208,160 | $2.9M | Add +24.3% |
| AIP Arteris Inc. | 0.52% | 286,241 | $2.9M | Reduce -11.7% |
| BWAY Brainsway Ltd.-ADR | 0.52% | 305,446 | $2.9M | Reduce -12.2% |
| CVLG Covenant Logistics Group Inc. | 0.52% | 52,674 | $2.9M | Reduce -13.1% |
| QDEL Quidelortho Corp. | 0.51% | 63,797 | $2.8M | New |
| RDCM Radcom Ltd. | 0.51% | 229,133 | $2.8M | New |
| VMI Valmont Industries | 0.51% | 9,159 | $2.8M | Add +10.9% |
| ZETA Zeta Global Holdings Corp. Class A | 0.50% | 155,850 | $2.8M | Reduce -49.1% |
| STXS Stereotaxis Inc. | 0.50% | 1,212,964 | $2.8M | Reduce -14.0% |
| THC Tenet Healthcare Corp. | 0.50% | 21,867 | $2.8M | Reduce -43.0% |
| TTI Tetra Technologies Inc. | 0.49% | 761,653 | $2.7M | Reduce -12.9% |
| ACVA Acv Auctions Inc. Class A | 0.49% | 125,065 | $2.7M | Reduce -12.8% |
| PAYX Paychex Inc. | 0.48% | 19,063 | $2.7M | Reduce -0.5% |
| NVRI Enviri Corp. | 0.48% | 345,875 | $2.7M | Reduce -11.1% |
| MDWD Mediwound Ltd. | 0.48% | 148,949 | $2.7M | Add +30.7% |
| XYL Xylem Inc. | 0.48% | 22,821 | $2.6M | Reduce -53.3% |
| INTU Intuit Inc. | 0.47% | 4,189 | $2.6M | No change |
| DAWN Day One Biopharmaceuticals I | 0.47% | 207,574 | $2.6M | Add +12.7% |
| BWXT BWX Technologies Inc. | 0.47% | 23,512 | $2.6M | Reduce -4.0% |
| LGTY Logility Supply Chain Soluti | 0.47% | 235,030 | $2.6M | Reduce -11.7% |
| EXTR Extreme Networks Inc. | 0.47% | 155,261 | $2.6M | New |
| PHR Phreesia Inc. | 0.46% | 102,738 | $2.6M | Reduce -12.8% |
| ZS Zscaler Inc. | 0.46% | 14,187 | $2.6M | Reduce -27.7% |
| SEM Select Medical Holdings Corp. | 0.45% | 133,819 | $2.5M | Reduce -2.6% |
Portfolio Sells Q3 2024 → Q4 2024
| ZETA Zeta Global Holdings Corp. Class A | Reduce -49.1% | 0.50% | −1.09 |
| MYGN Myriad Genetics Inc. | Reduce -50.5% | 0.29% | −0.84 |
| XYL Xylem Inc. | Reduce -53.3% | 0.48% | −0.67 |
| THC Tenet Healthcare Corp. | Reduce -43.0% | 0.50% | −0.62 |
| DCTH Delcath Systems Inc. | Sold out | 0.00% | −0.53 |
| EOLS Evolus Inc. | Reduce -38.3% | 0.36% | −0.47 |
| TBBK The Bancorp Inc. | Sold out | 0.00% | −0.46 |
| PRCT Procept Biorobotics Corp. | Reduce -36.1% | 0.75% | −0.38 |
| SEM Select Medical Holdings Corp. | Reduce -2.6% | 0.45% | −0.38 |
| DRS Leonardo DRS Inc. | Reduce -31.3% | 1.50% | −0.35 |
| LTRX Lantronix Inc. | Reduce -100.0% | 0.00% | −0.34 |
| OPRX Optimizerx Corp. | Sold out | 0.00% | −0.33 |
| TCMD Tactile Systems Technology I | Sold out | 0.00% | −0.31 |
| BDSX Biodesix Inc. | Sold out | 0.00% | −0.30 |
| EVLV Evolv Technologies Holdings | Sold out | 0.00% | −0.28 |
| MWA Mueller Water Products Inc. Class A | Sold out | 0.00% | −0.28 |
| KNSA Kiniksa Pharmaceuticals Inte | Reduce -13.3% | 0.62% | −0.26 |
| SG Sweetgreen Inc. Class A | Reduce -31.5% | 0.44% | −0.25 |
| NVRI Enviri Corp. | Reduce -11.1% | 0.48% | −0.22 |
| AQST Aquestive Therapeutics Inc. | Reduce -11.8% | 0.40% | −0.21 |
| ENPH Enphase Energy Inc. | Sold out | 0.00% | −0.20 |
| TRNS Transcat Inc. | Reduce -11.9% | 0.73% | −0.19 |
| CECO Ceco Environmental Corp. | Reduce -25.6% | 0.84% | −0.18 |
| BLDR Builders Firstsource Inc. | Reduce -13.3% | 0.35% | −0.18 |
| PATK Patrick Industries Inc. | Reduce -10.4% | 0.72% | −0.17 |
| DLHC DLH Holdings Corp. | Sold out | 0.00% | −0.17 |
| NOVT Novanta Inc. | Reduce -12.7% | 0.56% | −0.17 |
| WLDN Willdan Group Inc. | Reduce -11.4% | 0.95% | −0.17 |
| PFE Pfizer Inc. | Reduce -16.0% | 0.60% | −0.16 |
| ARRY Array Technologies Inc. | Sold out | 0.00% | −0.15 |
| EVER Everquote Inc. Class A | Reduce -16.6% | 0.65% | −0.15 |
| INSM Insmed Inc. | Reduce -12.8% | 0.84% | −0.15 |
| NVMI Nova Ltd. | Reduce -81.3% | 0.03% | −0.14 |
| ERII Energy Recovery Inc. | Reduce -7.6% | 0.58% | −0.14 |
| HUBB Hubbell Inc. | Reduce -28.7% | 0.33% | −0.13 |
| GWRE Guidewire Software Inc. | Reduce -3.9% | 1.32% | −0.13 |
| ZS Zscaler Inc. | Reduce -27.7% | 0.46% | −0.12 |
| KELYA Kelly Services Inc. Class A | Reduce -12.4% | 0.17% | −0.12 |
| SYM Symbotic Inc. | Sold out | 0.00% | −0.12 |
| FOLD Amicus Therapeutics Inc. | Reduce -14.0% | 0.39% | −0.11 |
| UVE Universal Insurance Holdings | Reduce -11.7% | 0.67% | −0.10 |
| PESI Perma-Fix Environmental SVCS | Reduce -12.5% | 0.38% | −0.09 |
| OCUL Ocular Therapeutix Inc. | Reduce -12.7% | 0.59% | −0.08 |
| ARLO Arlo Technologies Inc. | Reduce -11.8% | 0.38% | −0.07 |
| BP BP PLC-Spons ADR | Reduce -5.6% | 0.76% | −0.07 |
| CGNX Cognex Corp. | Reduce -8.1% | 0.33% | −0.06 |
| SHYF The Shyft Group Inc. | Reduce -12.5% | 0.34% | −0.06 |
| AVNT Avient Corp. | Reduce -12.7% | 0.16% | −0.06 |
| DCBO Docebo Inc. | Reduce -13.0% | 0.57% | −0.06 |
| CSTE Caesarstone Ltd. | Reduce -14.7% | 0.25% | −0.06 |
Portfolio Buys Q3 2024 → Q4 2024
| IEX Idex Corp. | Add +28356.0% | 0.90% | +0.90 |
| GDYN Grid Dynamics Holdings Inc. | New | 0.56% | +0.56 |
| QDEL Quidelortho Corp. | New | 0.51% | +0.51 |
| RDCM Radcom Ltd. | New | 0.51% | +0.51 |
| EXTR Extreme Networks Inc. | New | 0.47% | +0.47 |
| FWRD Forward Air Corp. | New | 0.45% | +0.45 |
| OUST Ouster Inc. | Add +66.7% | 0.61% | +0.42 |
| AMBA Ambarella Inc. | Add +6.0% | 1.18% | +0.34 |
| GTLS Chart Industries Inc. | New | 0.34% | +0.34 |
| NUTX Nutex Health Inc. | Add +45.4% | 0.60% | +0.33 |
| TSEM Tower Semiconductor Ltd. | Add +2.1% | 1.70% | +0.31 |
| PEGA Pegasystems Inc. | Add +27.1% | 0.77% | +0.31 |
| XERS Xeris Biopharma Holdings Inc. | New | 0.29% | +0.29 |
| ECG Everus Construction Group | New | 0.27% | +0.27 |
| MEI Methode Electronics Inc. | New | 0.26% | +0.26 |
| FSLR First Solar Inc. | Add +7902.3% | 0.23% | +0.22 |
| GS Goldman Sachs Group Inc. | Add +3.5% | 1.01% | +0.19 |
| GEV GE Vernova Inc. | Add +0.2% | 0.69% | +0.17 |
| RCEL Avita Medical Inc. | Add +13.0% | 0.60% | +0.17 |
| BPMC Blueprint Medicines Corp. | Add +29.0% | 0.72% | +0.15 |
| MDWD Mediwound Ltd. | Add +30.7% | 0.48% | +0.12 |
| SIBN Si-Bone Inc. | Add +24.3% | 0.52% | +0.12 |
| VMI Valmont Industries | Add +10.9% | 0.51% | +0.09 |
| RUN Sunrun Inc. | New | 0.07% | +0.07 |
| LPTH Lightpath Technologies Inc. Class A | New | 0.06% | +0.06 |
| TRMB Trimble Inc. | Add +0.5% | 0.36% | +0.06 |
| BGC BGC Group Inc. Class A | Add +5.9% | 0.54% | +0.04 |
| LNSR Lensar Inc. | Add +18.4% | 0.06% | +0.04 |
| BMI Badger Meter Inc. | Add +6.2% | 0.61% | +0.04 |
| NSPR Inspiremd Inc. | New | 0.03% | +0.03 |
| ENVX Enovix Corp. | Add +0.3% | 0.16% | +0.03 |
| AIRG Airgain Inc. | New | 0.03% | +0.03 |
| DAWN Day One Biopharmaceuticals I | Add +12.7% | 0.47% | +0.03 |
| HCAT Health Catalyst Inc. | Add +19.4% | 0.38% | +0.02 |
| NINEQ Nine Energy Service Inc. | New | 0.02% | +0.02 |
| DUOT Duos Technologies Group Inc. | New | 0.02% | +0.02 |
| RIVN Rivian Automotive Inc. Class A | Add +0.4% | 0.11% | +0.02 |
| CODA Coda Octopus Group Inc. | New | 0.02% | +0.02 |
| OWLT Owlet Inc. | New | 0.02% | +0.02 |
| ELTK Eltek Ltd. | New | 0.02% | +0.02 |
| WYY Widepoint Corp. | Add +9.8% | 0.04% | +0.02 |
| DAIO Data I/O Corp. | Add +37.6% | 0.02% | +0.01 |
| ALKT Alkami Technology Inc. | New | 0.01% | +0.01 |
| TACT Transact Technologies Inc. | Add +20.3% | 0.03% | +0.00 |
| FCX Freeport-McMoran Inc. | Add +6.3% | 0.01% | −0.00 |
| CREX Creative Realities Inc. | Add +51.9% | 0.02% | −0.00 |
| WMS Advanced Drainage Systems Inc. | Add +29.8% | 0.26% | −0.00 |
| MP MP Materials Corp. | Add +7.6% | 0.36% | −0.01 |
| ALB Albemarle Corp. | Add +0.2% | 0.24% | −0.02 |
| XPRO Expro Group Holdings NV | Add +24.3% | 0.33% | −0.02 |
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 |