Essex Investment Management Co. LLC
In its 13F for Q1 2024 (holdings as of March 31, 2024, filed May 3, 2024), Essex Investment Management Co. LLC reported 306 stock positions worth $506.7 million. Its top holding was Microsoft (MSFT) at 2.1% of the portfolio, followed by Apple (AAPL, 2.1%) and Hci (HCI, 2.1%). Compared with Q4 2023, it opened 24 new positions, sold out of 33, added to 78 and reduced 100. The biggest buy was a new position in Tower Semiconductor (TSEM) and the biggest sale Sterling Infrastructure (STRL, shares −64%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0000201772
- Portfolio Value
- $506.7M (Q1 2024)
- SEC Filing
- 0000201772-24-000003 ↗ filed May 3, 2024
Holdings Value
Holdings 306 stocks · $506.7M
| MSFT Microsoft Corp. | 2.12% | 25,569 | $10.8M | Reduce -11.1% |
| AAPL Apple Inc. | 2.12% | 62,558 | $10.7M | Reduce -9.1% |
| HCI Hci Group Inc. | 2.07% | 90,487 | $10.5M | Reduce -34.5% |
| NEE Nextera Energy Inc. | 1.70% | 134,634 | $8.6M | Add +42.7% |
| CRM Salesforce Inc. | 1.60% | 26,930 | $8.1M | Reduce -10.8% |
| AMSC American Superconductor Corp. | 1.56% | 583,924 | $7.9M | Reduce -6.4% |
| PRIM Primoris Services Corp. | 1.51% | 179,788 | $7.7M | Reduce -18.3% |
| DRS Leonardo DRS Inc. | 1.42% | 326,128 | $7.2M | Add +0.7% |
| THC Tenet Healthcare Corp. | 1.41% | 67,988 | $7.1M | Reduce -28.2% |
| DGII Digi International Inc. | 1.38% | 219,515 | $7.0M | Add +6.8% |
| AMZN Amazon.com Inc. | 1.38% | 38,823 | $7.0M | Reduce -9.8% |
| ASPN Aspen Aerogels Inc. | 1.34% | 385,455 | $6.8M | Reduce -11.0% |
| BP BP PLC-Spons ADR | 1.30% | 174,635 | $6.6M | Reduce -7.4% |
| KTOS Kratos Defense & Security | 1.29% | 356,135 | $6.5M | Reduce -4.1% |
| XYL Xylem Inc. | 1.24% | 48,465 | $6.3M | Add +27.9% |
| GWRE Guidewire Software Inc. | 1.21% | 52,367 | $6.1M | Reduce -9.8% |
| STRL Sterling Infrastructure Inc. | 1.20% | 55,161 | $6.1M | Reduce -63.8% |
| STKL Sunopta Inc. | 1.12% | 828,857 | $5.7M | Reduce -3.9% |
| TSEM Tower Semiconductor Ltd. | 1.09% | 165,028 | $5.5M | New |
| COUR Coursera Inc. | 1.00% | 360,462 | $5.1M | Reduce -7.8% |
| DVAX Dynavax Technologies Corp. | 0.99% | 403,686 | $5.0M | Add +223.2% |
| GHM Graham Corp. | 0.97% | 179,473 | $4.9M | Add +1.4% |
| GNRC Generac Holdings Inc. | 0.96% | 38,713 | $4.9M | Reduce -11.8% |
| PATK Patrick Industries Inc. | 0.95% | 40,100 | $4.8M | Add +0.0% |
| TALK Talkspace Inc. | 0.94% | 1,339,494 | $4.8M | Add +1.6% |
| GS Goldman Sachs Group Inc. | 0.94% | 11,417 | $4.8M | Reduce -9.6% |
| CECO Ceco Environmental Corp. | 0.94% | 205,982 | $4.7M | Add +1.6% |
| SEM Select Medical Holdings Corp. | 0.93% | 156,574 | $4.7M | Add +16.9% |
| PAY Paymentus Holdings Inc. Class A | 0.93% | 206,550 | $4.7M | Add +0.6% |
| DCPH Deciphera Pharmaceuticals Inc. | 0.90% | 288,635 | $4.5M | New |
| DIS The Walt Disney Co. filed as DISNEY WALT CO | 0.87% | 35,826 | $4.4M | Reduce -11.1% |
| INTU Intuit Inc. | 0.86% | 6,697 | $4.4M | Reduce -13.7% |
| ZS Zscaler Inc. | 0.86% | 22,560 | $4.3M | Reduce -9.5% |
| LINC Lincoln Educational Services | 0.86% | 420,360 | $4.3M | Add +1.4% |
| GMED Globus Medical Inc. Class A | 0.84% | 78,920 | $4.2M | Reduce -10.5% |
| TRNS Transcat Inc. | 0.82% | 37,435 | $4.2M | Add +1.5% |
| XOM Exxon Mobil Corp. | 0.82% | 35,805 | $4.2M | Reduce -13.8% |
| ERII Energy Recovery Inc. | 0.80% | 256,367 | $4.0M | Reduce -16.6% |
| ICHR Ichor Holdings Ltd. | 0.80% | 104,736 | $4.0M | Reduce -1.1% |
| LYTS Lsi Industries Inc. | 0.79% | 265,574 | $4.0M | Add +1.5% |
| WLDN Willdan Group Inc. | 0.77% | 135,336 | $3.9M | Add +1.6% |
| ATEC Alphatec Holdings Inc. | 0.74% | 270,968 | $3.7M | Add +1.5% |
| EOLS Evolus Inc. | 0.70% | 254,811 | $3.6M | Add +1.5% |
| NOVT Novanta Inc. | 0.69% | 20,045 | $3.5M | Add +1.5% |
| TBCH Turtle Beach Corp. | 0.69% | 201,340 | $3.5M | Add +43.8% |
| CRNT Ceragon Networks Ltd. | 0.68% | 1,080,444 | $3.5M | Add +1.6% |
| ONT Onterris Inc. filed as MONTROSE ENVIRONMENTAL GROUP | 0.68% | 87,859 | $3.4M | Add +33.1% |
| OCUL Ocular Therapeutix Inc. | 0.68% | 376,200 | $3.4M | Add +1.6% |
| KNSA Kiniksa Pharmaceuticals Ltd. | 0.67% | 172,740 | $3.4M | Add +0.5% |
| MRC MRC Global Inc. | 0.65% | 263,573 | $3.3M | Add +1.6% |
| TTI Tetra Technologies Inc. | 0.65% | 747,714 | $3.3M | Add +1.6% |
| KRUS Kura Sushi USA Inc. Class A | 0.65% | 28,751 | $3.3M | Add +1.5% |
| AEM Agnico Eagle Mines Ltd. | 0.62% | 53,060 | $3.2M | Reduce -12.6% |
| INVE Inve Technologies Inc. filed as IDENTIV INC | 0.62% | 395,438 | $3.1M | Add +1.5% |
| STXS Stereotaxis Inc. | 0.61% | 1,193,989 | $3.1M | Add +1.6% |
| NVRI Enviri Corp. | 0.61% | 338,493 | $3.1M | Add +1.6% |
| EYPT Eyepoint Inc. | 0.61% | 149,819 | $3.1M | Add +1.5% |
| PAYX Paychex Inc. | 0.59% | 24,401 | $3.0M | Reduce -1.0% |
| SG Sweetgreen Inc. Class A | 0.59% | 117,855 | $3.0M | Reduce -19.4% |
| PRCT Procept Biorobotics Corp. | 0.59% | 60,116 | $3.0M | Add +0.6% |
| MIR Mirion Technologies Inc. | 0.58% | 259,500 | $3.0M | Add +0.6% |
| INSM Insmed Inc. | 0.58% | 108,629 | $2.9M | Add +0.6% |
| GFF Griffon Corp. | 0.57% | 39,526 | $2.9M | Add +0.5% |
| CGNT Cognyte Software Ltd. | 0.55% | 339,452 | $2.8M | Add +1.6% |
| CCS Century Communities Inc. | 0.54% | 28,174 | $2.7M | Add +0.5% |
| BMI Badger Meter Inc. | 0.53% | 16,567 | $2.7M | Reduce -42.1% |
| HUBB Hubbell Inc. | 0.53% | 6,458 | $2.7M | Reduce -23.0% |
| MTRX Matrix Service Co. | 0.53% | 205,561 | $2.7M | Add +1.6% |
| GLDD Great Lakes Dredge & Dock Co. | 0.52% | 302,546 | $2.6M | Add +1.5% |
| AQST Aquestive Therapeutics Inc. | 0.52% | 612,949 | $2.6M | Reduce -27.6% |
| CGNX Cognex Corp. | 0.51% | 61,051 | $2.6M | Reduce -14.7% |
| OSPN Onespan Inc. | 0.50% | 219,481 | $2.6M | New |
| ARGAN INC | 0.50% | 49,947 | $2.5M | New |
| MTDR Matador Resources Co. | 0.49% | 37,532 | $2.5M | Add +0.5% |
| ZETA Zeta Global Holdings Corp. Class A | 0.49% | 227,417 | $2.5M | Add +0.6% |
| MWA Mueller Water Products Inc. Class A | 0.49% | 154,156 | $2.5M | Reduce -17.5% |
| EVR Evercore Inc. Class A | 0.48% | 12,758 | $2.5M | Reduce -27.7% |
| ARRY Array Technologies Inc. | 0.48% | 164,324 | $2.5M | Reduce -14.3% |
| RVLV Revolve Group Inc. Class A | 0.48% | 115,035 | $2.4M | Add +0.7% |
| BLDR Builders Firstsource Inc. | 0.48% | 11,631 | $2.4M | Reduce -19.6% |
| VMI Valmont Industries | 0.47% | 10,386 | $2.4M | Reduce -17.4% |
| PETQ Petiq Inc. | 0.47% | 129,027 | $2.4M | Add +0.4% |
| VMD Viemed Healthcare Inc. | 0.47% | 250,109 | $2.4M | Add +1.5% |
| SMWB Similarweb Ltd. | 0.46% | 260,450 | $2.3M | New |
| TBBK The Bancorp Inc. | 0.46% | 69,576 | $2.3M | Add +1.6% |
| ALB Albemarle Corp. | 0.46% | 17,619 | $2.3M | Reduce -13.8% |
| ZWS Zurn Elkay Water Solutions C | 0.45% | 68,799 | $2.3M | Reduce -29.8% |
| SSUP Superior Industries Intl | 0.45% | 789,946 | $2.3M | Add +1.5% |
| AUDC Audiocodes Ltd. | 0.45% | 174,521 | $2.3M | Add +1.6% |
| LZ Legalzoomcom Inc. | 0.45% | 170,241 | $2.3M | Add +0.5% |
| HRTG Heritage Insurance Holdings | 0.45% | 212,434 | $2.3M | Reduce -42.9% |
| PESI Perma-Fix Environmental SVCS | 0.44% | 189,450 | $2.3M | Add +1.6% |
| CLPT Clearpoint Neuro Inc. | 0.44% | 329,879 | $2.2M | New |
| KOPN Kopin Corp. | 0.43% | 1,224,056 | $2.2M | Reduce -7.3% |
| DCBO Docebo Inc. | 0.43% | 44,221 | $2.2M | Add +0.5% |
| AUGX Augmedix Inc. | 0.43% | 528,985 | $2.2M | Add +31.1% |
| ALTG Alta Equipment Group Inc. | 0.43% | 166,831 | $2.2M | Add +1.5% |
| LCUT Lifetime Brands Inc. | 0.42% | 203,575 | $2.1M | Add +1.6% |
| MNTX Manitex International Inc. | 0.42% | 307,868 | $2.1M | Add +1.5% |
| ORN Orion Group Holdings Inc. | 0.41% | 256,424 | $2.1M | Reduce -30.5% |
Portfolio Sells Q4 2023 → Q1 2024
| STRL Sterling Infrastructure Inc. | Reduce -63.8% | 1.20% | −1.44 |
| DAVA Endava PLC- Spon ADR | Sold out | 0.00% | −0.91 |
| NARI Inari Medical Inc. | Sold out | 0.00% | −0.78 |
| KRNT Kornit Digital Ltd. | Sold out | 0.00% | −0.69 |
| VCYT Veracyte Inc. | Sold out | 0.00% | −0.61 |
| ASIX Advansix Inc. | Sold out | 0.00% | −0.51 |
| COUR Coursera Inc. | Reduce -7.8% | 1.00% | −0.49 |
| AAPL Apple Inc. | Reduce -9.1% | 2.12% | −0.49 |
| LUNA Luna Innovations Inc. | Sold out | 0.00% | −0.46 |
| FVRR Fiverr International Ltd. | Sold out | 0.00% | −0.45 |
| AGX Argan Inc. | Sold out | 0.00% | −0.45 |
| AEHR Aehr Test Systems | Sold out | 0.00% | −0.43 |
| WTS Watts Water Technologies-A | Reduce -99.8% | 0.00% | −0.43 |
| ROCK Gibraltar Industries Inc. | Sold out | 0.00% | −0.43 |
| EGHT 8X8 Inc. | Sold out | 0.00% | −0.42 |
| SHLS Shoals Technologies Group -A | Sold out | 0.00% | −0.39 |
| AXGN Axogen Inc. | Sold out | 0.00% | −0.37 |
| NEM Newmont Corp. | Reduce -82.1% | 0.07% | −0.36 |
| ERII Energy Recovery Inc. | Reduce -16.6% | 0.80% | −0.34 |
| BMI Badger Meter Inc. | Reduce -42.1% | 0.53% | −0.34 |
| APTV Aptiv Irish Holdings Ltd. | Sold out | 0.00% | −0.31 |
| HUCK Huckleberry AI Inc. | Sold out | 0.00% | −0.31 |
| HCI Hci Group Inc. | Reduce -34.5% | 2.07% | −0.30 |
| ENVX Enovix Corp. | Reduce -49.6% | 0.14% | −0.30 |
| GTES Gates Industrial Corp. UK Ltd. | Reduce -95.3% | 0.02% | −0.29 |
| DDD 3D Systems Corp. | Sold out | 0.00% | −0.28 |
| LTHM Livent Corp. | Sold out | 0.00% | −0.27 |
| BE Bloom Energy Corp. Class A | Sold out | 0.00% | −0.26 |
| BKSY Blacksky Technology Inc. | Sold out | 0.00% | −0.26 |
| INOD Innodata Inc. | Sold out | 0.00% | −0.26 |
| PRTS Carparts.com Inc. | Sold out | 0.00% | −0.24 |
| ZS Zscaler Inc. | Reduce -9.5% | 0.86% | −0.23 |
| SFIX Stitch Fix Inc. Class A | Sold out | 0.00% | −0.23 |
| CUTRQ Cutera Inc. | Sold out | 0.00% | −0.20 |
| KTOS Kratos Defense & Security | Reduce -4.1% | 1.29% | −0.19 |
| MP MP Materials Corp. | Reduce -17.5% | 0.27% | −0.18 |
| GNRC Generac Holdings Inc. | Reduce -11.8% | 0.96% | −0.15 |
| ARRY Array Technologies Inc. | Reduce -14.3% | 0.48% | −0.15 |
| USAP Universal Stainless & Alloy | Reduce -57.2% | 0.12% | −0.13 |
| WOLF Wolfspeed Inc. | Reduce -22.3% | 0.14% | −0.12 |
| ALB Albemarle Corp. | Reduce -13.8% | 0.46% | −0.12 |
| BEEM Beam Global | Sold out | 0.00% | −0.12 |
| LNG Cheniere Energy Inc. | Reduce -19.9% | 0.38% | −0.12 |
| ASYS Amtech Systems Inc. | Sold out | 0.00% | −0.12 |
| ZWS Zurn Elkay Water Solutions C | Reduce -29.8% | 0.45% | −0.11 |
| VMI Valmont Industries | Reduce -17.4% | 0.47% | −0.11 |
| EVR Evercore Inc. Class A | Reduce -27.7% | 0.48% | −0.11 |
| IWP iShares Russell Mid-Cap Grow | Sold out | 0.00% | −0.11 |
| INTU Intuit Inc. | Reduce -13.7% | 0.86% | −0.10 |
| PWR Quanta Services Inc. | Reduce -50.6% | 0.14% | −0.10 |
Portfolio Buys Q4 2023 → Q1 2024
| TSEM Tower Semiconductor Ltd. | New | 1.09% | +1.09 |
| DCPH Deciphera Pharmaceuticals Inc. | New | 0.90% | +0.90 |
| DVAX Dynavax Technologies Corp. | Add +223.2% | 0.99% | +0.64 |
| NEE Nextera Energy Inc. | Add +42.7% | 1.70% | +0.57 |
| OSPN Onespan Inc. | New | 0.50% | +0.50 |
| ARGAN INC | New | 0.50% | +0.50 |
| SMWB Similarweb Ltd. | New | 0.46% | +0.46 |
| CLPT Clearpoint Neuro Inc. | New | 0.44% | +0.44 |
| ARWR Arrowhead Pharmaceuticals Inc. | New | 0.41% | +0.41 |
| BLZE Backblaze Inc. Class A | New | 0.40% | +0.40 |
| TBCH Turtle Beach Corp. | Add +43.8% | 0.69% | +0.38 |
| XYL Xylem Inc. | Add +27.9% | 1.24% | +0.38 |
| VIAV Viavi Solutions Inc. | New | 0.38% | +0.38 |
| TRMB Trimble Inc. | New | 0.37% | +0.37 |
| HCAT Health Catalyst Inc. | New | 0.36% | +0.36 |
| AVPT Avepoint Inc. | New | 0.36% | +0.36 |
| BGC BGC Group Inc. Class A | New | 0.36% | +0.36 |
| OCUL Ocular Therapeutix Inc. | Add +1.6% | 0.68% | +0.35 |
| QUIK Quicklogic Corp. | New | 0.34% | +0.34 |
| OUST Ouster Inc. | New | 0.34% | +0.34 |
| DGII Digi International Inc. | Add +6.8% | 1.38% | +0.33 |
| HASI Ha Sustainable Infrastructur | New | 0.32% | +0.32 |
| FENC Fennec Pharmaceuticals Inc. | New | 0.32% | +0.32 |
| SEM Select Medical Holdings Corp. | Add +16.9% | 0.93% | +0.31 |
| GHM Graham Corp. | Add +1.4% | 0.97% | +0.31 |
| MYO Myomo Inc. | Add +537.9% | 0.39% | +0.30 |
| MDWD Mediwound Ltd. | Add +241.6% | 0.37% | +0.29 |
| TALK Talkspace Inc. | Add +1.6% | 0.94% | +0.28 |
| MYRG MYR Group Inc./Delaware | New | 0.27% | +0.27 |
| ONT Onterris Inc. | Add +33.1% | 0.68% | +0.26 |
| CRNT Ceragon Networks Ltd. | Add +1.6% | 0.68% | +0.23 |
| KRUS Kura Sushi USA Inc. Class A | Add +1.5% | 0.65% | +0.23 |
| WLDN Willdan Group Inc. | Add +1.6% | 0.77% | +0.21 |
| STXS Stereotaxis Inc. | Add +1.6% | 0.61% | +0.21 |
| OPRX Optimizerx Corp. | New | 0.21% | +0.21 |
| PAY Paymentus Holdings Inc. Class A | Add +0.6% | 0.93% | +0.20 |
| EOLS Evolus Inc. | Add +1.5% | 0.70% | +0.18 |
| LCUT Lifetime Brands Inc. | Add +1.6% | 0.42% | +0.16 |
| PESI Perma-Fix Environmental SVCS | Add +1.6% | 0.44% | +0.16 |
| PATK Patrick Industries Inc. | Add +0.0% | 0.95% | +0.15 |
| DRS Leonardo DRS Inc. | Add +0.7% | 1.42% | +0.14 |
| SOPH Sophia Genetics SA | Add +112.1% | 0.26% | +0.14 |
| MTRX Matrix Service Co. | Add +1.6% | 0.53% | +0.14 |
| CSTE Caesarstone Ltd. | Add +89.7% | 0.27% | +0.14 |
| CVLG Covenant Logistics Group Inc. | Add +50.5% | 0.39% | +0.13 |
| CGNT Cognyte Software Ltd. | Add +1.6% | 0.55% | +0.13 |
| CECO Ceco Environmental Corp. | Add +1.6% | 0.94% | +0.13 |
| RSSS Research Solutions Inc. | New | 0.11% | +0.11 |
| RVLV Revolve Group Inc. Class A | Add +0.7% | 0.48% | +0.11 |
| RIVN Rivian Automotive Inc. Class A | New | 0.10% | +0.10 |
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 |