ESSEX INVESTMENT MANAGEMENT CO LLC

Q3 2025 13F-HR Holdings

Location
Boston, MA
Holdings as of
9/30/2025
Date filed
11/6/2025
Form type
13F-HR
Num holdings
299
Total value ($000)
$653,417
Net value change ($000)
+103,451 (18.8%)
New positions
30
Sold out positions
29
Turnover %
15.5%
Sector allocation + QoQ delta (equities-only)
Prev filing: 8/12/2025 Next filing: 2/13/2026 SEC filing

Snapshot: Change Analysis

Compared to Q2 2025
Methodology: sector metrics are equities-only; instrument mix chart is ex-options; options exposure is shown separately. Why this matters.
Top Adds (Value $000, Stocks/ETFs)
GSAT 7,072 NEW
KTOS 6,025 37.0%
INSM 5,863 87.8%
TSEM 5,729 67.7%
KNSA 4,859 102.4%
WMS 4,845 438.5%
BBNX 4,423 NEW
PENG 4,418 NEW
LGND 3,918 56.7%
TVTX 3,872 NEW
Top Reduces (Value $000, Stocks/ETFs)
BPMC -4,652 -100.0%
NEE -4,047 -73.3%
NUTX -4,034 -100.0%
MRC GLOBAL INC. -3,630 -100.0%
THC -3,561 -100.0%
OLOGBX -3,450 -100.0%
PENG -3,219 -100.0%
CGNT -3,146 -100.0%
IEX -3,131 -100.0%
MDWD -2,844 -100.0%
Instrument mix + QoQ Δ (ex-options)
How this table is calculated: SEC VALUE ($000) is used as reported. For derivatives (PUT/CALL/WARRANT/RIGHT), SEC value represents reported underlying exposure, not premium cash paid/received. Column % is bucket-based: non-options share is calculated inside non-option total, options share is calculated inside options total. Details.
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Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type