ESSEX INVESTMENT MANAGEMENT CO LLC

Q4 2025 13F-HR Holdings

Location
Boston, MA
Holdings as of
12/31/2025
Date filed
2/13/2026
Form type
13F-HR
Num holdings
306
Total value ($000)
$655,942
Net value change ($000)
+2,525 (0.4%)
New positions
36
Sold out positions
29
Turnover %
16.9%
Sector allocation + QoQ delta (equities-only)
Prev filing: 11/6/2025 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q3 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)
TSEM 8,423 59.3%
XZO 7,059 NEW
WGO 4,437 NEW
THRM 4,038 NEW
CMCO 3,588 NEW
DAKT 3,536 NEW
WK 3,346 5311.1%
VREX 3,196 NEW
OSG 3,196 NEW
GSAT 3,145 44.5%
Top Reduces (Value $000, Stocks/ETFs)
AMSC -8,393 -57.5%
KTOS -7,861 -35.3%
CLPT -5,065 -100.0%
NVRI -4,471 -100.0%
PENG -4,418 -100.0%
STKL -4,074 -100.0%
OSPN -3,617 -100.0%
SMWB -3,541 -100.0%
AMPX -3,260 -44.4%
DRS -3,164 -26.5%
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.
Filter:
Instrument:
Issuer Name Ticker Sector Industry Class History Value ($000) % Shares Shares Δ Shares Δ% Value Δ ($000) Value Δ% Principal Option Type