Essex Investment Management Co LLC
Essex Investment Management Co LLC, managed by Nancy Prial & Robert Uek, reported 306 positions worth $763.37M in its 2026 Q2 13F filing: 25 new and 24 closed.
Estimated return
Since 2025 Q2 the disclosed positions returned an estimated +93.2% against +34.4% for the S&P 500. Price-only return of the fund's top 100 US longs at each quarter start, vs the S&P 500 over the same windows. Not the fund's actual return (no trades, fees, shorts, derivatives, cash).
| Quarter | Fund | S&P 500 |
|---|---|---|
| 2025 Q2 | +22.7% | +11.4% |
| 2025 Q3 | +21.3% | +7.6% |
| 2025 Q4 | +2.3% | +3.1% |
| 2026 Q1 | -0.3% | -5.8% |
| 2026 Q2 | +27.2% | +15.5% |
Top holdings, 2026 Q2
| Ticker | Company | Value | Portfolio % | Change |
|---|---|---|---|---|
| TSEM | TOWER SEMICONDUCTOR LTD | $27.51M | 3.60% | -9% |
| LINC | LINCOLN EDL SVCS CORP | $16.98M | 2.20% | -4.2% |
| KNSA | KINIKSA PHARMACEUTICALS INTL P | $15.44M | 2.00% | -3.2% |
| OUST | OUSTER INC | $14.13M | 1.90% | +22.5% |
| LGND | LIGAND PHARMACEUTICALS INC | $13.77M | 1.80% | -25.5% |
| CECO | CECO ENVIRONMENTAL CORP | $13.65M | 1.80% | -4.3% |
| STRL | STERLING INFRASTRUCTURE INC | $13.56M | 1.80% | -49.6% |
| AIP | ARTERIS INC | $13.49M | 1.80% | -4.4% |
| MIRM | MIRUM PHARMACEUTICALS INC | $12.37M | 1.60% | -2.5% |
| AGX | ARGAN INC | $12.35M | 1.60% | -3.9% |
| GHM | GRAHAM CORP | $11.56M | 1.50% | -27.2% |
| DRS | LEONARDO DRS INC | $10.68M | 1.40% | -4.3% |
| ADPT | ADAPTIVE BIOTECHNOLOGIES CORP | $10.14M | 1.30% | -4.2% |
| WERN | WERNER ENTERPRISES INC | $10.10M | 1.30% | NEW |
| HCI | HCI GROUP INC | $9.86M | 1.30% | -2.4% |
| GEV | GE VERNOVA INC | $9.73M | 1.30% | -0.4% |
| COHU | COHU INC | $9.69M | 1.30% | -31.6% |
| AAPL | APPLE INC | $9.38M | 1.20% | -0.5% |
| AMSC | AMERICAN SUPERCONDUCTOR CORP | $9.21M | 1.20% | -2.5% |
| BWAY | BRAINSWAY LTD | $9.19M | 1.20% | -4.2% |
| TTI | TETRA TECHNOLOGIES INC DEL | $8.40M | 1.10% | -4.3% |
| LYTS | LSI INDS INC OHIO | $7.86M | 1.00% | +7.9% |
| MRVL | MARVELL TECHNOLOGY INC | $7.72M | 1.00% | -28.4% |
| KTOS | KRATOS DEFENSE & SEC SOLUTIONS | $7.66M | 1.00% | -3.3% |
| GS | GOLDMAN SACHS GROUP INC | $7.60M | 1.00% | -0.6% |
| TVTX | TRAVERE THERAPEUTICS INC | $7.60M | 1.00% | -17.2% |
| PATK | PATRICK INDS INC | $7.45M | 0.98% | +79.5% |
| ORN | ORION GROUP HLDGS INC | $7.44M | 0.98% | -4.2% |
| ASML | ASML HLDG NV | $7.04M | 0.92% | -0.5% |
| AMBA | AMBARELLA INC | $6.86M | 0.90% | -2.9% |
| NVCR | NOVOCURE LTD | $6.66M | 0.87% | -2.8% |
| AMZN | AMAZON COM INC | $6.45M | 0.84% | -0.5% |
| AVPT | AVEPOINT INC | $6.41M | 0.84% | +14.7% |
| WMS | ADVANCED DRAIN SYS INC DEL | $6.34M | 0.83% | -0.4% |
| SMTC | SEMTECH CORP | $6.19M | 0.81% | -24.5% |
| OII | OCEANEERING INTL INC | $6.14M | 0.80% | -4.4% |
| ECG | EVERUS CONSTR GROUP | $6.04M | 0.79% | -4.5% |
| AEM | AGNICO EAGLE MINES LTD | $5.97M | 0.78% | -0.5% |
| LQDA | LIQUIDIA CORPORATION | $5.96M | 0.78% | -4.4% |
| WLDN | WILLDAN GROUP INC | $5.92M | 0.78% | -4.3% |
| FEIM | FREQUENCY ELECTRS INC | $5.91M | 0.77% | -4.3% |
| MSFT | MICROSOFT CORP | $5.86M | 0.77% | -0.5% |
| MAMA | MAMAS CREATIONS INC | $5.84M | 0.76% | -4.3% |
| XERS | XERIS BIOPHARMA HOLDINGS INC | $5.67M | 0.74% | -4.3% |
| PKE | PARK AEROSPACE CORP | $5.48M | 0.72% | -4.2% |
| BDSX | BIODESIX INC | $5.46M | 0.71% | +83.1% |
| XMTR | XOMETRY INC | $5.40M | 0.71% | NEW |
| BXC | BLUELINX HLDGS INC | $5.36M | 0.70% | NEW |
| MITK | MITEK SYS INC | $5.31M | 0.70% | -4.2% |
| CXDO | CREXENDO INC | $5.31M | 0.70% | -4.3% |
All funds · Hedge Fund Tracker
Source: SEC EDGAR 13F filings, reported as of quarter end and filed up to 45 days later. Not investment advice.