Portolan Capital Management, LLC

Q3 2025 13F-HR Holdings

Location
Boston, MA
Holdings as of
9/30/2025
Date filed
11/13/2025
Form type
13F-HR
Num holdings
119
Total value ($000)
$1,848,024
Net value change ($000)
+253,071 (15.9%)
New positions
41
Sold out positions
40
Turnover %
33.6%
Sector allocation + QoQ delta (equities-only)
Prev filing: 8/13/2025 Next filing: 2/17/2026 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)
MOD 37,153 76.6%
DBRG 32,078 100.6%
SMTC 30,681 179.3%
CLBT 28,646 176.9%
DOMO 27,049 174.8%
LASR 22,809 NEW
TTMI 22,588 49.2%
WWW 21,859 NEW
TLN 21,219 111.3%
PSIX 19,232 NEW
Top Reduces (Value $000, Stocks/ETFs)
FOUR -28,520 -66.1%
CLS -23,819 -27.8%
SLM -23,290 -100.0%
PBPB -20,429 -100.0%
METC -18,649 -100.0%
TPR -16,100 -84.6%
ALGN -12,825 -100.0%
VIRT -12,244 -100.0%
PAYO -12,038 -100.0%
OPRT -11,595 -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