Portolan Capital Management, LLC is an institutional investment manager that files quarterly 13F reports with the SEC. As of Q4 2025, the fund manages $1.9B in reported equity holdings across 155 positions. The largest holdings are TTMI (4.2%), MOD (3.8%), CSTL (3.6%), CLS (2.7%), AKAM (2.5%). The portfolio is concentrated in Other (87.0%), Technology (4.3%), Real Estate (2.1%). Data sourced from SEC EDGAR 13F filings (CIK 1350290).