Portolan Capital Management, LLC

Q2 2026 13F-HR Holdings

Location
Boston, MA
Holdings as of
6/30/2026
Date filed
8/14/2026
Form type
13F-HR
Num holdings
148
Total value ($000)
$2,670,929
Net value change ($000)
+791,966 (42.1%)
New positions
36
Sold out positions
32
Turnover %
26.8%
Sector allocation + QoQ delta (equities-only)
Prev filing: 5/15/2026 Next filing: — SEC filing

Snapshot: Change Analysis

Compared to Q1 2026
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)
VPG 106,851 241.3%
VIRT 74,313 139.4%
QLYS 51,844 246.9%
FOUR 44,820 478.3%
PENG 41,515 NEW
ENVA 36,864 335.4%
MEC 33,931 230.2%
GENI 30,212 244.4%
SRAD 27,245 NEW
BAND 26,124 NEW
Top Reduces (Value $000, Stocks/ETFs)
PBF -38,096 -100.0%
CRGY -35,115 -100.0%
BIDU -29,872 -73.2%
CSTL -25,307 -76.3%
FN -24,953 -87.4%
CNR -24,825 -100.0%
PARR -24,290 -55.9%
MUSA -23,763 -100.0%
CRCL -20,398 -100.0%
PRIM -18,685 -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