Largest positions
| Issuer | Class | Value | Share |
|---|---|---|---|
| Tower Semiconductor LtdCOM | COM | $27.5M | 3.6% |
| Lincoln Edl Svcs Corp.COM | COM | $17M | 2.2% |
| Kiniksa Pharmaceuticals Intl PCOM | COM | $15.4M | 2.0% |
| Ouster Inc.COM | COM | $14.1M | 1.9% |
| Ligand Pharmaceuticals Inc.COM | COM | $13.8M | 1.8% |
| Ceco Environmental Corp.COM | COM | $13.6M | 1.8% |
| Sterling Infrastructure Inc.COM | COM | $13.6M | 1.8% |
| Arteris Inc.COM | COM | $13.5M | 1.8% |
| Mirum Pharmaceuticals Inc.COM | COM | $12.4M | 1.6% |
| Argan Inc.COM | COM | $12.4M | 1.6% |
| Graham Corp.COM | COM | $11.6M | 1.5% |
| Leonardo Drs Inc.COM | COM | $10.7M | 1.4% |
| Adaptive Biotechnologies Corp.COM | COM | $10.1M | 1.3% |
| Werner Enterprises Inc.COM | COM | $10.1M | 1.3% |
| Hci Group Inc.COM | COM | $9.86M | 1.3% |
| GE Vernova Inc.COM | COM | $9.73M | 1.3% |
| Cohu Inc.COM | COM | $9.69M | 1.3% |
| Apple Inc.COM | COM | $9.38M | 1.2% |
| American Superconductor Corp.COM | COM | $9.21M | 1.2% |
| Brainsway LtdADR | ADR | $9.19M | 1.2% |
| Tetra Technologies Inc. DelCOM | COM | $8.4M | 1.1% |
| Lsi Inds Inc. OhioCOM | COM | $7.86M | 1.0% |
| Marvell Technology Inc.COM | COM | $7.72M | 1.0% |
| Kratos Defense & Sec SolutionsCOM | COM | $7.66M | 1.0% |
| Travere Therapeutics Inc.COM | COM | $7.6M | 1.0% |
| Goldman Sachs Group Inc.COM | COM | $7.6M | 1.0% |
| Patrick Inds Inc.COM | COM | $7.45M | 1.0% |
| Orion Group Hldgs Inc.COM | COM | $7.44M | 1.0% |
| ASML Hldg NVADR | ADR | $7.04M | 0.9% |
| Ambarella Inc.COM | COM | $6.86M | 0.9% |
| Novocure LtdCOM | COM | $6.66M | 0.9% |
| Amazon Com Inc.COM | COM | $6.45M | 0.8% |
| Avepoint Inc.COM | COM | $6.41M | 0.8% |
| Advanced Drain Sys Inc. DelCOM | COM | $6.34M | 0.8% |
| Semtech Corp.COM | COM | $6.19M | 0.8% |
| Oceaneering Intl Inc.COM | COM | $6.14M | 0.8% |
| Everus Constr GroupCOM | COM | $6.04M | 0.8% |
| Agnico Eagle Mines LtdCOM | COM | $5.97M | 0.8% |
| Liquidia CorporationCOM | COM | $5.96M | 0.8% |
| Willdan Group Inc.COM | COM | $5.92M | 0.8% |
| Frequency Electrs Inc.COM | COM | $5.91M | 0.8% |
| Microsoft Corp.COM | COM | $5.86M | 0.8% |
| Mamas Creations Inc.COM | COM | $5.84M | 0.8% |
| Xeris Biopharma Holdings Inc.COM | COM | $5.67M | 0.7% |
| Park Aerospace Corp.COM | COM | $5.48M | 0.7% |
| Biodesix Inc.COM | COM | $5.46M | 0.7% |
| Xometry Inc.COM | COM | $5.4M | 0.7% |
| Bluelinx Hldgs Inc.COM | COM | $5.36M | 0.7% |
| Mitek Sys Inc.COM | COM | $5.31M | 0.7% |
| Crexendo Inc.COM | COM | $5.31M | 0.7% |
- Class
- COM
- Share
- 3.6%
- Class
- COM
- Share
- 2.2%
- Class
- COM
- Share
- 2.0%
- Class
- COM
- Share
- 1.9%
- Class
- COM
- Share
- 1.8%
- Class
- COM
- Share
- 1.8%
- Class
- COM
- Share
- 1.8%
- Class
- COM
- Share
- 1.8%
- Class
- COM
- Share
- 1.6%
- Class
- COM
- Share
- 1.6%
- Class
- COM
- Share
- 1.5%
- Class
- COM
- Share
- 1.4%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.3%
- Class
- COM
- Share
- 1.2%
- Class
- COM
- Share
- 1.2%
- Class
- ADR
- Share
- 1.2%
- Class
- COM
- Share
- 1.1%
- Class
- COM
- Share
- 1.0%
- Class
- COM
- Share
- 1.0%
- Class
- COM
- Share
- 1.0%
- Class
- COM
- Share
- 1.0%
- Class
- COM
- Share
- 1.0%
- Class
- COM
- Share
- 1.0%
- Class
- COM
- Share
- 1.0%
- Class
- ADR
- Share
- 0.9%
- Class
- COM
- Share
- 0.9%
- Class
- COM
- Share
- 0.9%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.8%
- Class
- COM
- Share
- 0.7%
- Class
- COM
- Share
- 0.7%
- Class
- COM
- Share
- 0.7%
- Class
- COM
- Share
- 0.7%
- Class
- COM
- Share
- 0.7%
- Class
- COM
- Share
- 0.7%
- Class
- COM
- Share
- 0.7%
The share class is shown on a wider screen.
The 50 largest of 306 positions by value, with holdings of the same security combined. The 200 largest are in this firm's machine-readable record. Share counts and quarter-on-quarter changes for each position are on EDGAR. View the full information table on EDGAR
This filing
- Form
- 13F-HR
- CIK
- 201772
- File number
- 028-00878
- Options
- 0 call, 0 put
- In the 25 largest
- 38.3%
- Prior quarter
- $632M at 31 March 2026
- Positions opened
- 27
- Positions closed
- 26
Common questions
What are Essex Investment Management’s 13F holdings worth?
$763 million across 306 positions for the quarter ended 30 June 2026.
What is Essex Investment Management’s largest 13F holding?
TOWER SEMICONDUCTOR LTD (COM) was the largest position at $27.5 million, or 3.6% of reported 13F value, as of 30 June 2026.
How concentrated is Essex Investment Management’s 13F portfolio?
The ten largest positions accounted for 20.1% of reported value and the twenty-five largest for 38.3%, across 306 positions as of 30 June 2026.
Does Form 13F show everything Essex Investment Management manages?
No. Form 13F covers only long positions in exchange-traded securities over which the manager has investment discretion, valued at quarter end. It excludes cash, most bonds, private funds, and any assets the firm does not have discretion over, so it is neither the firm's total assets nor any individual client's portfolio.
How often does Essex Investment Management file its 13F?
Every quarter. Managers file within 45 days of each quarter's end, so the figures are a snapshot that changes between filings. This page shows the quarter ended 30 June 2026.
Answered from this filing and the prior quarter's.