ESSEX INVESTMENT MANAGEMENT CO LLC

CIK 0000201772 · BOSTON, MA · Quarter end: 2026-06-30 · Filed on: 2026-08-06 · Open the SEC source

ESSEX INVESTMENT MANAGEMENT CO LLC reported 306 positions worth $763.4M as of June 30, 2026 (13F filed August 6, 2026). Largest holding: TSEM (3.6%).

Portfolio Value (AUM)Total value of the fund's US stock portfolio reported to the SEC.
$763.4M
2026 Q2
Positions
306
Top-10 ConcentrationHow much of the portfolio sits in the 10 largest holdings. High = concentrated bets.
20.1%
Est. Net Flow (Q)
2026 Q2
10 / 306 positions shown
#SymbolCompanyTypeValue% Port.Shares1YYTD
1TSEMTOWER SEMICONDUCTOR LTDSH$27.5M3.60%105,543
2LINCLINCOLN EDL SVCS CORPSH$17.0M2.22%340,366
3KNSAKINIKSA PHARMACEUTICALS INTL PSH$15.4M2.02%241,382
4OUSTOUSTER INCSH$14.1M1.85%226,028
5LGNDLIGAND PHARMACEUTICALS INCSH$13.8M1.80%43,567
6CECOCECO ENVIRONMENTAL CORPSH$13.6M1.79%150,416
7STRLSTERLING INFRASTRUCTURE INCSH$13.6M1.78%16,155
8AIPARTERIS INCSH$13.5M1.77%277,665
9MIRMMIRUM PHARMACEUTICALS INCSH$12.4M1.62%105,669
10AGXARGAN INCSH$12.4M1.62%15,467

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Read the 2026-Q2 quarterly report · 13F Filing Calendar

Frequently Asked Questions

What stocks does ESSEX INVESTMENT MANAGEMENT CO LLC hold as of Q2 2026?

ESSEX INVESTMENT MANAGEMENT CO LLC reported 306 positions worth $763.4M in its Q2 2026 13F filing. Largest positions: TSEM (3.6%), LINC (2.2%), KNSA (2.0%), OUST (1.9%) and LGND (1.8%).

What did ESSEX INVESTMENT MANAGEMENT CO LLC buy in Q2 2026?

No previous quarter is available yet; the comparison appears with the next filing.

What did ESSEX INVESTMENT MANAGEMENT CO LLC sell in Q2 2026?

No previous quarter is available yet.

13F data shows quarter-end positions, is delayed by up to 45 days and covers only long positions in US-listed securities; short positions, most derivatives and non-US assets are not reported.