SEC 13F Intelligence

Managers / Q1 2026

Portolan Capital Management, LLC

CIK 0001350290 · 2 INTERNATIONAL PLACE, 26TH FLOOR, BOSTON, MA, 02110 · 617.753.6400

Reported Value
$1.9B
Q1 2026
Positions
144
Filings on Record
30
2019–present window
Filed
May 15, 2026
original filing

Summary

Portolan Capital Management, Llc reported $1.9B in U.S.-listed holdings across 144 positions for Q1 2026.

Its largest position, MOD, represents 4.8% of the portfolio.

Compared with Q4 2025, the fund opened 30 new positions and exited 41.

Reported Value by Quarter

13F Reported Value
Q4 ’18: $807MQ4 ’18Q1 ’19: $972MQ2 ’19: $930MQ3 ’19: $887MQ4 ’19: $990MQ4 ’19Q1 ’20: $667MQ2 ’20: $876MQ3 ’20: $884MQ4 ’20: $1.1BQ4 ’20Q1 ’21: $1.3BQ2 ’21: $1.4BQ3 ’21: $1.4BQ4 ’21: $1.5BQ4 ’21Q1 ’22: $1.3BQ2 ’22: $993MQ3 ’22: $946MQ4 ’22: $1.01TQ4 ’22Q1 ’23: $1.0BQ2 ’23: $1.1BQ3 ’23: $1.1BQ4 ’23: $1.1BQ4 ’23Q1 ’24: $1.3BQ2 ’24: $1.2BQ3 ’24: $1.4BQ4 ’24: $1.5BQ4 ’24Q1 ’25: $1.3BQ2 ’25: $1.6BQ3 ’25: $1.8BQ4 ’25: $1.9BQ4 ’25Q1 ’26: $1.9Bfilingsflow.com

Portfolio Composition

By security type
Common Stock: 83.5%Other: 10.8%ADR: 5.7%
  • Common Stock · 83.5% · $1.6B
  • Other · 10.8% · $202M
  • ADR · 5.7% · $107M

Quarter-over-Quarter Changes full breakdown →

Holdings — Q1 2026

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Filing History

QuarterReported ValuePositionsFiledTypeLinks
Q1 2026$1.9B144May 15, 202613F-HRchanges · EDGAR ↗
Q4 2025$1.9B155Feb 17, 202613F-HRchanges · EDGAR ↗
Q3 2025$1.8B119Nov 13, 202513F-HRchanges · EDGAR ↗
Q2 2025$1.6B118Aug 13, 202513F-HRchanges · EDGAR ↗
Q1 2025$1.3B109May 15, 202513F-HRchanges · EDGAR ↗
Q4 2024$1.5B131Feb 13, 202513F-HRchanges · EDGAR ↗
Q3 2024$1.4B129Nov 14, 202413F-HRchanges · EDGAR ↗
Q2 2024$1.2B117Aug 14, 202413F-HRchanges · EDGAR ↗
Q1 2024$1.3B116May 15, 202413F-HRchanges · EDGAR ↗
Q4 2023$1.1B127Feb 14, 202413F-HRchanges · EDGAR ↗
Q3 2023$1.1B123Nov 14, 202313F-HRchanges · EDGAR ↗
Q2 2023$1.1B120Aug 14, 202313F-HRchanges · EDGAR ↗
Q1 2023$1.0B139May 15, 202313F-HRchanges · EDGAR ↗
Q4 2022$1.01T131Feb 13, 202313F-HRchanges · EDGAR ↗
Q3 2022$946M128Nov 14, 202213F-HRchanges · EDGAR ↗
Q2 2022$993M123Aug 15, 202213F-HRchanges · EDGAR ↗
Q1 2022$1.3B136May 16, 202213F-HRchanges · EDGAR ↗
Q4 2021$1.5B131Feb 14, 202213F-HRchanges · EDGAR ↗
Q3 2021$1.4B134Nov 15, 202113F-HRchanges · EDGAR ↗
Q2 2021$1.4B131Aug 16, 202113F-HRchanges · EDGAR ↗
Q1 2021$1.3B151May 17, 202113F-HRchanges · EDGAR ↗
Q4 2020$1.1B164Feb 16, 202113F-HRchanges · EDGAR ↗
Q3 2020$884M139Nov 16, 202013F-HRchanges · EDGAR ↗
Q2 2020$876M128Aug 14, 202013F-HRchanges · EDGAR ↗
Q1 2020$667M112May 14, 202013F-HRchanges · EDGAR ↗
Q4 2019$990M95Feb 14, 202013F-HRchanges · EDGAR ↗
Q3 2019$887M87Nov 14, 201913F-HRchanges · EDGAR ↗
Q2 2019$930M88Aug 14, 201913F-HRchanges · EDGAR ↗
Q1 2019$972M87May 15, 201913F-HRchanges · EDGAR ↗
Q4 2018$807M82Feb 13, 201913F-HRchanges · EDGAR ↗

13F filings are due up to 45 days after quarter end, so holdings shown here lag the fund’s current book. Source: original SEC filing on EDGAR ↗.