ESSEX INVESTMENT MANAGEMENT CO LLC

Q1 2026 13F-HR Holdings

Location
Boston, MA
Holdings as of
3/31/2026
Date filed
5/11/2026
Form type
13F-HR
Num holdings
305
Total value ($000)
$631,737
Net value change ($000)
-24,205 (-3.7%)
New positions
28
Sold out positions
29
Turnover %
17.7%
Sector allocation + QoQ delta (equities-only)
Prev filing: 2/13/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q4 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)
LINC 5,064 53.9%
NVCR 4,931 NEW
SNDX 4,648 NEW
MG 3,969 NEW
MITK 3,721 NEW
MRVL 3,586 NEW
AGIO 3,490 NEW
AMPX 3,433 84.2%
SOPH 3,429 NEW
DIOD 3,336 NEW
Top Reduces (Value $000, Stocks/ETFs)
BBNX -6,636 -100.0%
UVE -5,995 -100.0%
ANGO -4,629 -100.0%
WGO -4,437 -100.0%
MXL -4,106 -100.0%
GLDD -3,962 -100.0%
ADPT -3,289 -32.4%
KTOS -3,238 -22.4%
RDCM -2,986 -100.0%
CRNT -2,923 -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