Essex Investment Management Co. LLC
In its 13F for Q2 2024 (holdings as of June 30, 2024, filed August 12, 2024), Essex Investment Management Co. LLC reported 302 stock positions worth $534.7 million. Its top holding was American Superconductor (AMSC) at 2.5% of the portfolio, followed by Apple (AAPL, 2.2%) and Microsoft (MSFT, 1.9%). Compared with Q1 2024, it opened 29 new positions, sold out of 34, added to 84 and reduced 124. The biggest buy was a new position in Ligand Pharmaceuticals (LGND) and the biggest sale an exit from Digi International (DGII).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0000201772
- Portfolio Value
- $534.7M (Q2 2024)
- SEC Filing
- 0000201772-24-000004 ↗ filed Aug 12, 2024
Holdings Value
Holdings 302 stocks · $534.7M
| AMSC American Superconductor Corp. | 2.53% | 577,626 | $13.5M | Reduce -1.1% |
| AAPL Apple Inc. | 2.17% | 55,099 | $11.6M | Reduce -11.9% |
| MSFT Microsoft Corp. | 1.92% | 22,926 | $10.2M | Reduce -10.3% |
| DRS Leonardo DRS Inc. | 1.78% | 373,996 | $9.5M | Add +14.7% |
| NEE Nextera Energy Inc. | 1.62% | 121,979 | $8.6M | Reduce -9.4% |
| HCI Hci Group Inc. | 1.56% | 90,609 | $8.4M | Add +0.1% |
| KTOS Kratos Defense & Security | 1.53% | 407,618 | $8.2M | Add +14.5% |
| PRIM Primoris Services Corp. | 1.44% | 154,415 | $7.7M | Reduce -14.1% |
| ASPN Aspen Aerogels Inc. | 1.32% | 295,116 | $7.0M | Reduce -23.4% |
| THC Tenet Healthcare Corp. | 1.31% | 52,814 | $7.0M | Reduce -22.3% |
| INSM Insmed Inc. | 1.29% | 103,184 | $6.9M | Reduce -5.0% |
| AMZN Amazon.com Inc. | 1.29% | 35,561 | $6.9M | Reduce -8.4% |
| STRL Sterling Infrastructure Inc. | 1.26% | 56,867 | $6.7M | Add +3.1% |
| XYL Xylem Inc. | 1.25% | 49,235 | $6.7M | Add +1.6% |
| TSEM Tower Semiconductor Ltd. | 1.23% | 167,028 | $6.6M | Add +1.2% |
| GWRE Guidewire Software Inc. | 1.22% | 47,254 | $6.5M | Reduce -9.8% |
| AVPT Avepoint Inc. | 1.18% | 604,006 | $6.3M | Add +159.4% |
| CRM Salesforce Inc. | 1.14% | 23,730 | $6.1M | Reduce -11.9% |
| CECO Ceco Environmental Corp. | 1.12% | 207,864 | $6.0M | Add +0.9% |
| LGND Ligand Pharmaceuticals | 1.12% | 70,780 | $6.0M | New |
| MYGN Myriad Genetics Inc. | 1.10% | 240,128 | $5.9M | New |
| BP BP PLC-Spons ADR | 1.06% | 157,024 | $5.7M | Reduce -10.1% |
| PATK Patrick Industries Inc. | 1.02% | 50,293 | $5.5M | Add +25.4% |
| ZETA Zeta Global Holdings Corp. Class A | 1.01% | 305,449 | $5.4M | Add +34.3% |
| GHM Graham Corp. | 1.00% | 189,633 | $5.3M | Add +5.7% |
| LINC Lincoln Educational Services | 0.98% | 442,249 | $5.2M | Add +5.2% |
| TRNS Transcat Inc. | 0.97% | 43,273 | $5.2M | Add +15.6% |
| SEM Select Medical Holdings Corp. | 0.94% | 143,247 | $5.0M | Reduce -8.5% |
| PRCT Procept Biorobotics Corp. | 0.92% | 80,764 | $4.9M | Add +34.4% |
| GMED Globus Medical Inc. Class A | 0.90% | 69,896 | $4.8M | Reduce -11.4% |
| GNRC Generac Holdings Inc. | 0.89% | 36,174 | $4.8M | Reduce -6.6% |
| DVAX Dynavax Technologies Corp. | 0.88% | 419,191 | $4.7M | Add +3.8% |
| AMBA Ambarella Inc. | 0.88% | 87,219 | $4.7M | New |
| GS Goldman Sachs Group Inc. | 0.87% | 10,238 | $4.6M | Reduce -10.3% |
| STKL Sunopta Inc. | 0.86% | 849,492 | $4.6M | Add +2.5% |
| WLDN Willdan Group Inc. | 0.84% | 155,223 | $4.5M | Add +14.7% |
| ONT Onterris Inc. filed as MONTROSE ENVIRONMENTAL GROUP | 0.84% | 100,347 | $4.5M | Add +14.2% |
| LYTS Lsi Industries Inc. | 0.83% | 305,286 | $4.4M | Add +14.9% |
| AGX Argan Inc. | 0.78% | 56,791 | $4.2M | New |
| PAY Paymentus Holdings Inc. Class A | 0.75% | 209,695 | $4.0M | Add +1.5% |
| ZS Zscaler Inc. | 0.74% | 20,527 | $3.9M | Reduce -9.0% |
| EVER Everquote Inc. Class A | 0.73% | 186,075 | $3.9M | New |
| MRC MRC Global Inc. | 0.72% | 299,132 | $3.9M | Add +13.5% |
| NOVT Novanta Inc. | 0.71% | 23,299 | $3.8M | Add +16.2% |
| MIR Mirion Technologies Inc. | 0.70% | 350,498 | $3.8M | Add +35.1% |
| KNSA Kiniksa Pharmaceuticals Inte | 0.70% | 199,799 | $3.7M | Add +15.7% |
| XOM Exxon Mobil Corp. | 0.69% | 31,919 | $3.7M | Reduce -10.8% |
| TALK Talkspace Inc. | 0.67% | 1,547,721 | $3.6M | Add +15.6% |
| SG Sweetgreen Inc. Class A | 0.63% | 112,333 | $3.4M | Reduce -4.7% |
| GFF Griffon Corp. | 0.63% | 52,711 | $3.4M | Add +33.4% |
| NVRI Enviri Corp. | 0.63% | 387,814 | $3.3M | Add +14.6% |
| DIS The Walt Disney Co. filed as DISNEY WALT CO | 0.62% | 33,455 | $3.3M | Reduce -6.6% |
| INTU Intuit Inc. | 0.62% | 5,042 | $3.3M | Reduce -24.7% |
| TBCH Turtle Beach Corp. | 0.62% | 230,879 | $3.3M | Add +14.7% |
| OSPN Onespan Inc. | 0.61% | 255,348 | $3.3M | Add +16.3% |
| PETQ Petiq Inc. | 0.61% | 148,109 | $3.3M | Add +14.8% |
| ATEC Alphatec Holdings Inc. | 0.61% | 312,651 | $3.3M | Add +15.4% |
| ERII Energy Recovery Inc. | 0.61% | 244,688 | $3.3M | Reduce -4.6% |
| AEM Agnico Eagle Mines Ltd. | 0.60% | 48,947 | $3.2M | Reduce -7.8% |
| EOLS Evolus Inc. | 0.60% | 294,442 | $3.2M | Add +15.6% |
| CRNT Ceragon Networks Ltd. | 0.58% | 1,247,764 | $3.1M | Add +15.5% |
| BMI Badger Meter Inc. | 0.58% | 16,567 | $3.1M | No change |
| GLDD Great Lakes Dredge & Dock Co. | 0.57% | 346,602 | $3.0M | Add +14.6% |
| TBBK The Bancorp Inc. | 0.57% | 80,166 | $3.0M | Add +15.2% |
| OCUL Ocular Therapeutix Inc. | 0.57% | 442,509 | $3.0M | Add +17.6% |
| TTI Tetra Technologies Inc. | 0.56% | 872,483 | $3.0M | Add +16.7% |
| CVLG Covenant Logistics Group Inc. | 0.56% | 60,445 | $3.0M | Add +40.4% |
| CGNT Cognyte Software Ltd. | 0.55% | 388,350 | $3.0M | Add +14.4% |
| SSUP Superior Industries Intl | 0.55% | 908,097 | $3.0M | Add +15.0% |
| DCTH Delcath Systems Inc. | 0.53% | 335,903 | $2.8M | New |
| ARLO Arlo Technologies Inc. | 0.52% | 214,284 | $2.8M | New |
| NVCR Novocure Ltd. | 0.52% | 161,486 | $2.8M | New |
| XPRO Expro Group Holdings NV | 0.51% | 118,721 | $2.7M | Add +34.6% |
| CGNX Cognex Corp. | 0.50% | 57,442 | $2.7M | Reduce -5.9% |
| FOLD Amicus Therapeutics Inc. | 0.50% | 268,000 | $2.7M | New |
| ARWR Arrowhead Pharmaceuticals Inc. | 0.50% | 102,262 | $2.7M | Add +41.4% |
| VMI Valmont Industries | 0.49% | 9,594 | $2.6M | Reduce -7.6% |
| MTDR Matador Resources Co. | 0.49% | 44,132 | $2.6M | Add +17.6% |
| BGC BGC Group Inc. Class A | 0.48% | 312,204 | $2.6M | Add +32.8% |
| EVR Evercore Inc. Class A | 0.48% | 12,373 | $2.6M | Reduce -3.0% |
| STXS Stereotaxis Inc. | 0.48% | 1,406,412 | $2.6M | Add +17.8% |
| CLPT Clearpoint Neuro Inc. | 0.47% | 462,586 | $2.5M | Add +40.2% |
| ORN Orion Group Holdings Inc. | 0.46% | 260,972 | $2.5M | Add +1.8% |
| HLIO Helios Technologies Inc. | 0.46% | 51,080 | $2.4M | New |
| HRTX Heron Therapeutics Inc. | 0.46% | 695,993 | $2.4M | New |
| BWXT BWX Technologies Inc. | 0.45% | 25,542 | $2.4M | Add +1860.3% |
| PAYX Paychex Inc. | 0.45% | 20,351 | $2.4M | Reduce -16.6% |
| TILE Interface Inc. | 0.45% | 163,504 | $2.4M | New |
| GDRX Goodrx Holdings Inc. Class A | 0.44% | 304,770 | $2.4M | New |
| SMWB Similarweb Ltd. | 0.44% | 304,544 | $2.4M | Add +16.9% |
| HUBB Hubbell Inc. | 0.44% | 6,458 | $2.4M | No change |
| MTRX Matrix Service Co. | 0.44% | 237,421 | $2.4M | Add +15.5% |
| DCBO Docebo Inc. | 0.43% | 59,769 | $2.3M | Add +35.2% |
| UVE Universal Insurance Holdings | 0.43% | 122,501 | $2.3M | New |
| FTDR Frontdoor Inc. | 0.43% | 67,635 | $2.3M | Add +100.2% |
| ADPT Adaptive Biotechnologies | 0.42% | 623,825 | $2.3M | Add +125.1% |
| PESI Perma-Fix Environmental SVCS | 0.42% | 219,130 | $2.2M | Add +15.7% |
| MDWD Mediwound Ltd. | 0.41% | 142,794 | $2.2M | Add +7.8% |
| BLDR Builders Firstsource Inc. | 0.40% | 15,567 | $2.2M | Add +33.8% |
| ITCI Intra-Cellular Therapies Inc. | 0.40% | 31,448 | $2.2M | Add +2450.5% |
Portfolio Sells Q1 2024 → Q2 2024
| DGII Digi International Inc. | Sold out | 0.00% | −1.38 |
| COUR Coursera Inc. | Sold out | 0.00% | −1.00 |
| DCPH Deciphera Pharmaceuticals Inc. | Sold out | 0.00% | −0.90 |
| ICHR Ichor Holdings Ltd. | Sold out | 0.00% | −0.80 |
| KRUS Kura Sushi USA Inc. Class A | Sold out | 0.00% | −0.65 |
| EYPT Eyepoint Inc. | Reduce -71.6% | 0.07% | −0.54 |
| CCS Century Communities Inc. | Sold out | 0.00% | −0.54 |
| ARGAN INC | Sold out | 0.00% | −0.50 |
| VMD Viemed Healthcare Inc. | Sold out | 0.00% | −0.47 |
| CRM Salesforce Inc. | Reduce -11.9% | 1.14% | −0.46 |
| KOPN Kopin Corp. | Sold out | 0.00% | −0.43 |
| AUGX Augmedix Inc. | Sold out | 0.00% | −0.43 |
| BLZE Backblaze Inc. Class A | Sold out | 0.00% | −0.40 |
| VIAV Viavi Solutions Inc. | Sold out | 0.00% | −0.38 |
| HCAT Health Catalyst Inc. | Sold out | 0.00% | −0.36 |
| ARAY Accuray Inc. | Sold out | 0.00% | −0.32 |
| FENC Fennec Pharmaceuticals Inc. | Sold out | 0.00% | −0.32 |
| MYRG MYR Group Inc./Delaware | Sold out | 0.00% | −0.27 |
| DIS The Walt Disney Co. | Reduce -6.6% | 0.62% | −0.24 |
| INTU Intuit Inc. | Reduce -24.7% | 0.62% | −0.24 |
| MWA Mueller Water Products Inc. Class A | Reduce -51.5% | 0.25% | −0.24 |
| BP BP PLC-Spons ADR | Reduce -10.1% | 1.06% | −0.24 |
| ZWS Zurn Elkay Water Solutions C | Reduce -37.2% | 0.24% | −0.22 |
| RVNC Revance Therapeutics Inc. | Sold out | 0.00% | −0.21 |
| ARRY Array Technologies Inc. | Reduce -13.7% | 0.27% | −0.21 |
| MSFT Microsoft Corp. | Reduce -10.3% | 1.92% | −0.21 |
| ERII Energy Recovery Inc. | Reduce -4.6% | 0.61% | −0.19 |
| ALB Albemarle Corp. | Reduce -9.1% | 0.29% | −0.17 |
| INTT Intest Corp. | Reduce -65.6% | 0.05% | −0.15 |
| HDSN Hudson Technologies Inc. | Reduce -65.4% | 0.05% | −0.14 |
| PAYX Paychex Inc. | Reduce -16.6% | 0.45% | −0.14 |
| WOLF Wolfspeed Inc. | Sold out | 0.00% | −0.14 |
| PEP Pepsico Inc. | Reduce -35.8% | 0.18% | −0.14 |
| DLTR Dollar Tree Inc. | Reduce -11.3% | 0.28% | −0.14 |
| XOM Exxon Mobil Corp. | Reduce -10.8% | 0.69% | −0.13 |
| TDUP Thredup Inc. Class A | Sold out | 0.00% | −0.13 |
| GEOS Geospace Technologies Corp. | Reduce -65.5% | 0.04% | −0.13 |
| VLO Valero Energy Corp. | Reduce -30.0% | 0.20% | −0.13 |
| AXP American Express Co. | Reduce -38.7% | 0.18% | −0.12 |
| ZS Zscaler Inc. | Reduce -9.0% | 0.74% | −0.12 |
| CXDO Crexendo Inc. | Reduce -65.4% | 0.03% | −0.11 |
| APT Alpha Pro Tech Ltd. | Reduce -65.5% | 0.04% | −0.10 |
| AMZN Amazon.com Inc. | Reduce -8.4% | 1.29% | −0.10 |
| THC Tenet Healthcare Corp. | Reduce -22.3% | 1.31% | −0.10 |
| SYM Symbotic Inc. | Reduce -24.5% | 0.12% | −0.10 |
| PG The Procter & Gamble Co. | Reduce -21.7% | 0.29% | −0.09 |
| VTSI Virtra Inc. | Reduce -73.3% | 0.02% | −0.09 |
| PFIE Profire Energy Inc. | Reduce -65.4% | 0.03% | −0.09 |
| MLM Martin Marietta Materials | Reduce -11.3% | 0.25% | −0.09 |
| PXLW Pixelworks Inc. | Reduce -65.4% | 0.01% | −0.09 |
Portfolio Buys Q1 2024 → Q2 2024
| LGND Ligand Pharmaceuticals | New | 1.12% | +1.12 |
| MYGN Myriad Genetics Inc. | New | 1.10% | +1.10 |
| AMBA Ambarella Inc. | New | 0.88% | +0.88 |
| AVPT Avepoint Inc. | Add +159.4% | 1.18% | +0.81 |
| AGX Argan Inc. | New | 0.78% | +0.78 |
| EVER Everquote Inc. Class A | New | 0.73% | +0.73 |
| DCTH Delcath Systems Inc. | New | 0.53% | +0.53 |
| ARLO Arlo Technologies Inc. | New | 0.52% | +0.52 |
| ZETA Zeta Global Holdings Corp. Class A | Add +34.3% | 1.01% | +0.52 |
| NVCR Novocure Ltd. | New | 0.52% | +0.52 |
| FOLD Amicus Therapeutics Inc. | New | 0.50% | +0.50 |
| HLIO Helios Technologies Inc. | New | 0.46% | +0.46 |
| HRTX Heron Therapeutics Inc. | New | 0.46% | +0.46 |
| TILE Interface Inc. | New | 0.45% | +0.45 |
| GDRX Goodrx Holdings Inc. Class A | New | 0.44% | +0.44 |
| UVE Universal Insurance Holdings | New | 0.43% | +0.43 |
| BWXT BWX Technologies Inc. | Add +1860.3% | 0.45% | +0.43 |
| ITCI Intra-Cellular Therapies Inc. | Add +2450.5% | 0.40% | +0.39 |
| GEV GE Vernova Inc. | Add +4257.5% | 0.38% | +0.37 |
| DRS Leonardo DRS Inc. | Add +14.7% | 1.78% | +0.36 |
| TTEK Tetra Tech Inc. | New | 0.35% | +0.35 |
| PRCT Procept Biorobotics Corp. | Add +34.4% | 0.92% | +0.34 |
| RDVT Red Violet Inc. | New | 0.32% | +0.32 |
| UPWK Upwork Inc. | Add +3205.5% | 0.31% | +0.30 |
| NRDS Nerdwallet Inc. Class A | New | 0.30% | +0.30 |
| ARQT Arcutis Biotherapeutics Inc. | New | 0.28% | +0.28 |
| AXTI Axt Inc. | New | 0.27% | +0.27 |
| ADPT Adaptive Biotechnologies | Add +125.1% | 0.42% | +0.25 |
| CTV Innovid Corp. | New | 0.24% | +0.24 |
| MBLY Mobileye Global Inc. Class A | New | 0.24% | +0.24 |
| KTOS Kratos Defense & Security | Add +14.5% | 1.53% | +0.23 |
| FTDR Frontdoor Inc. | Add +100.2% | 0.43% | +0.21 |
| RSSS Research Solutions Inc. | Add +277.4% | 0.32% | +0.21 |
| ENPH Enphase Energy Inc. | New | 0.19% | +0.19 |
| CECO Ceco Environmental Corp. | Add +0.9% | 1.12% | +0.19 |
| CVLG Covenant Logistics Group Inc. | Add +40.4% | 0.56% | +0.16 |
| XPRO Expro Group Holdings NV | Add +34.6% | 0.51% | +0.16 |
| ONT Onterris Inc. | Add +14.2% | 0.84% | +0.16 |
| PETQ Petiq Inc. | Add +14.8% | 0.61% | +0.15 |
| TRNS Transcat Inc. | Add +15.6% | 0.97% | +0.15 |
| TSEM Tower Semiconductor Ltd. | Add +1.2% | 1.23% | +0.14 |
| BGC BGC Group Inc. Class A | Add +32.8% | 0.48% | +0.12 |
| LINC Lincoln Educational Services | Add +5.2% | 0.98% | +0.12 |
| MIR Mirion Technologies Inc. | Add +35.1% | 0.70% | +0.12 |
| OPRX Optimizerx Corp. | Add +95.4% | 0.32% | +0.11 |
| OSPN Onespan Inc. | Add +16.3% | 0.61% | +0.11 |
| TBBK The Bancorp Inc. | Add +15.2% | 0.57% | +0.11 |
| SSUP Superior Industries Intl | Add +15.0% | 0.55% | +0.10 |
| CSTE Caesarstone Ltd. | Add +18.1% | 0.36% | +0.10 |
| ARWR Arrowhead Pharmaceuticals Inc. | Add +41.4% | 0.50% | +0.09 |
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 |