Essex Investment Management Co LLC reported 284 positions worth $666.00M for the quarter ended Sep 30, 2026, down 11.5% on the prior quarter. It opened 16 new positions, added to 15, trimmed 143 and exited 20. Its largest holding is Tower Semiconductor Ltd at 3.1% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| WTS Watts Water Technologies Inc | +12.0K | +239,600.0% | $4.24M | 0.637% |
| ACOG Alpha Cognition Inc. | +422.9K | – | $3.81M | 0.571% |
| NUVB Nuvation Bio Inc. | +673.8K | +100.4% | $3.77M | 1.13% |
| NVDA Nvidia Corp | +16.2K | – | $3.70M | 0.556% |
| LGIH LGI Homes, Inc. | +78.6K | – | $3.66M | 0.55% |
| IA Innovative Solutions & Support Inc | +184.9K | – | $3.43M | 0.515% |
| FENC Fennec Pharmaceuticals Inc. | +318.8K | – | $3.39M | 0.51% |
| OCFC Oceanfirst Financial Corp | +198.9K | – | $3.29M | 0.494% |
| ESOA Energy Services of America CORP | +216.0K | +829.3% | $2.41M | 0.405% |
| KRNT Kornit Digital Ltd. | +142.3K | – | $2.37M | 0.355% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| CXDO Crexendo, Inc. | -710.9K | -100.0% | $5.31M | Exited |
| OSG Octave Specialty Group Inc | -539.3K | -100.0% | $3.37M | Exited |
| TSEM Tower Semiconductor Ltd | -14.0K | -13.3% | $3.19M | 3.13% |
| OUST Ouster, Inc. | -73.1K | -32.3% | $2.95M | 0.926% |
| KNSA Kiniksa Pharmaceuticals International, plc | -39.4K | -16.3% | $2.94M | 2.26% |
| BRCC BRC Inc. | -262.5K | -100.0% | $2.91M | Exited |
| STXS Stereotaxis, Inc. | -1.52M | -100.0% | $2.62M | Exited |
| DIS Walt Disney Co | -22.7K | -100.0% | $2.18M | Exited |
| BLND Blend Labs, Inc. | -1.25M | -100.0% | $2.15M | Exited |
| ADPT Adaptive Biotechnologies Corp | -71.0K | -15.0% | $2.05M | 1.74% |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| ACOG Alpha Cognition Inc. | +422.9K | $3.81M | 0.571% |
| NVDA Nvidia Corp | +16.2K | $3.70M | 0.556% |
| LGIH LGI Homes, Inc. | +78.6K | $3.66M | 0.55% |
| IA Innovative Solutions & Support Inc | +184.9K | $3.43M | 0.515% |
| FENC Fennec Pharmaceuticals Inc. | +318.8K | $3.39M | 0.51% |
| OCFC Oceanfirst Financial Corp | +198.9K | $3.29M | 0.494% |
| KRNT Kornit Digital Ltd. | +142.3K | $2.37M | 0.355% |
| NNBR Nn Inc | +643.7K | $2.36M | 0.355% |
| KBR Kbr, Inc. | +52.9K | $1.86M | 0.28% |
| DE Deere & Co | +1,186 | $796.46K | 0.12% |
| Holding | Shares Sold | Trade Value | Prior Weight |
|---|---|---|---|
| CXDO Crexendo, Inc. | -710.9K | $5.31M | 0.706% |
| OSG Octave Specialty Group Inc | -539.3K | $3.37M | 0.447% |
| BRCC BRC Inc. | -262.5K | $2.91M | 0.387% |
| STXS Stereotaxis, Inc. | -1.52M | $2.62M | 0.348% |
| DIS Walt Disney Co | -22.7K | $2.18M | 0.29% |
| BLND Blend Labs, Inc. | -1.25M | $2.15M | 0.285% |
| IDN Intellicheck, Inc. | -488.2K | $2.00M | 0.266% |
| PEGA Pegasystems Inc | -65.6K | $1.97M | 0.261% |
| INVE INVE Technologies, Inc. | -484.4K | $1.22M | 0.162% |
| UPWK Upwork, Inc | -131.9K | $1.10M | 0.147% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | TSEM Tower Semiconductor Ltd | Technology | 91.5K | $20.81M | 3.13% | -14.0K | -13.3% | Reduced | 0.08% |
| 2 | KNSA Kiniksa Pharmaceuticals International, plc | Healthcare | 202.0K | $15.07M | 2.26% | -39.4K | -16.3% | Reduced | 0.26% |
| 3 | LGND Ligand Pharmaceuticals Inc | Healthcare | 38.9K | $12.16M | 1.83% | -4,650 | -10.7% | Reduced | 0.19% |
| 4 | ADPT Adaptive Biotechnologies Corp | Healthcare | 401.7K | $11.61M | 1.74% | -71.0K | -15.0% | Reduced | 0.25% |
| 5 | AAPL Apple Inc. | Technology | 31.1K | $10.35M | 1.55% | -1,343 | -4.1% | Reduced | 0% |
| 6 | CECO Ceco Environmental Corp | Industrials | 145.7K | $10.15M | 1.52% | -4,699 | -3.1% | Reduced | 0.25% |
| 7 | HCI HCI Group, Inc. | Financial Services | 54.3K | $9.44M | 1.42% | -1,978 | -3.5% | Reduced | 0.44% |
| 8 | DRS Leonardo DRS, Inc. | Industrials | 242.5K | $8.88M | 1.33% | -7,736 | -3.1% | Reduced | 0.09% |
| 9 | MIRM Mirum Pharmaceuticals, Inc. | Healthcare | 101.7K | $8.69M | 1.31% | -3,953 | -3.7% | Reduced | 0.16% |
| 10 | COHU Cohu Inc | Technology | 127.2K | $8.67M | 1.3% | -3,990 | -3.0% | Reduced | 0.25% |
| 11 | AVPT AvePoint, Inc. | Technology | 552.0K | $7.77M | 1.17% | -19.6K | -3.4% | Reduced | 0.26% |
| 12 | STRL Sterling Infrastructure, Inc. | Industrials | 15.5K | $7.64M | 1.15% | -619 | -3.8% | Reduced | 0.05% |
| 13 | TVTX Travere Therapeutics, Inc. | Healthcare | 129.5K | $7.62M | 1.14% | -4,373 | -3.3% | Reduced | 0.14% |
| 14 | BWAY Brainsway Ltd. | Healthcare | 574.8K | $7.59M | 1.14% | -17.8K | -3.0% | Reduced | 1.51% |
| 15 | GEV GE Vernova Inc. | Industrials | 7,978 | $7.58M | 1.14% | -305 | -3.7% | Reduced | 0% |
Tip. Select a row to see that position’s full history at Essex Investment Management.
As of its Q3 2026 13F filing, Essex Investment Management Co LLC’s five largest positions were Tower Semiconductor Ltd (TSEM) at 3.1%, Kiniksa Pharmaceuticals International, plc (KNSA) at 2.3%, Ligand Pharmaceuticals Inc (LGND) at 1.8%, Adaptive Biotechnologies Corp (ADPT) at 1.7%, Apple Inc. (AAPL) at 1.6% of the reported portfolio.
Essex Investment Management Co LLC reported a 13F portfolio worth $666.00M across 284 positions for Q3 2026. That is down 11.5% from the previous quarter.
Its largest purchases by value were Watts Water Technologies Inc ($4.24M), Alpha Cognition Inc. ($3.81M), Nuvation Bio Inc. ($3.77M). It opened 16 new positions.
Its largest sales by value were Crexendo, Inc. ($5.31M), Octave Specialty Group Inc ($3.37M), Tower Semiconductor Ltd ($3.19M). It exited 20 positions entirely.
From the Form 13F-HR reports Essex Investment Management Co LLC files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.