Essex Investment Management Co
Essex Investment Management Co reported 301 stocks worth $675M in its 13F filing for Q3 2026, filed Oct 19, 2026. Its largest holdings are TSEM (3.1%), KNSA (2.2%) and LGND (1.8%). Compared with Q2 2026, the fund opened new positions in ACOG, NVDA and LGIH, added to NUVB, LTRX and THRM, trimmed TSEM, KNSA and LGND and sold out of CXDO, OSG and STXS.
Holdings
| # | Stock | Value | Weight | Shares | Change | Shares, 8 qtrs | Held |
|---|---|---|---|---|---|---|---|
| 1 |  TSEM Tower Semiconductor Ltd | $20.8M | 3.1% | 92K | −14K (−13%) | 8 of 8 | |
| 2 |  KNSA Kiniksa Pharmaceuticals Intl | $15.1M | 2.2% | 202K | −39K (−16%) | 8 of 8 | |
| 3 |  LGND Ligand Pharmaceuticals Inc | $12.2M | 1.8% | 39K | −4,650 (−11%) | 8 of 8 | |
| 4 |  ADPT Adaptive Biotechnologies Cor | $11.6M | 1.7% | 402K | −71K (−15%) | 8 of 8 | |
| 5 |  AAPL Apple Inc | $10.4M | 1.5% | 31K | −1,343 (−4%) | 8 of 8 | |
| 6 |  CECO Ceco Environmental Corp | $10.1M | 1.5% | 146K | −4,699 (−3%) | 8 of 8 | |
| 7 |  HCI Hci Group Inc | $9.4M | 1.4% | 54K | −1,978 (−4%) | 8 of 8 | |
| 8 |  DRS Leonardo Drs Inc | $8.9M | 1.3% | 242K | −7,736 (−3%) | 8 of 8 | |
| 9 |  MIRM Mirum Pharmaceuticals Inc | $8.7M | 1.3% | 102K | −3,953 (−4%) | 6 of 8 | |
| 10 |  COHU Cohu Inc | $8.7M | 1.3% | 127K | −3,990 (−3%) | 6 of 8 |
Positions at Sep 30, 2026, as reported. Change is against the fund's Q2 2026 filing; weight is the share of the fund's reported stocks.
Sold out
held in Q2 2026, gone in Q3 2026| Stock | Value last quarter | Shares sold |
|---|---|---|
 CXDO Crexendo Inc | $5.3M | 711K |
 OSG Ambac Finl Group Inc | $3.4M | 539K |
BRC INC | $2.9M | 2.6M |
 STXS Stereotaxis Inc | $2.6M | 1.5M |
 DIS Disney Walt Co | $2.2M | 23K |
🔒 Free account: see all 26.
Reported value
last 8 quartersThe value of the US stocks the fund reported, at quarter end prices. It moves with the market as well as with buying and selling.
Filings for Q3 2026
straight from the SEC| Filed | Form | Quarter | |
|---|---|---|---|
| Oct 19, 2026 | 13F-HR | Q3 2026 | SEC filing ↗ |
Other superinvestors
All hedge fund holdings →Essex Investment Management Co 13F FAQ
What does Essex Investment Management Co own?
Essex Investment Management Co reported 301 stocks worth $675M in its 13F filing for Q3 2026, filed Oct 19, 2026. Its largest holdings are TSEM (3.1%), KNSA (2.2%) and LGND (1.8%). The table above lists every position in the filing (the top 10 without an account).
What did Essex Investment Management Co buy and sell in Q3 2026?
Compared with Q2 2026: 21 new positions, 18 added to, 142 trimmed and 26 sold out. New positions include ACOG, NVDA and LGIH. It sold all of CXDO, OSG and STXS.
When will Essex Investment Management Co file its next 13F?
Holdings as of Dec 31, 2026 are due by Feb 15, 2027. The filing appears on this page within minutes of reaching the SEC.
How much is Essex Investment Management Co's portfolio worth?
The Q3 2026 filing reports $675M in US stocks. That leaves out cash, bonds, short positions and most foreign holdings, so the fund's total assets are usually larger.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Holdings come from the fund's SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. The fund may have changed its positions since. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.