StockDriftsStockDriftsTop 50 Portolan Capital Management LLC Holdings
| Stock | Company | % Port. | Shares | Value | Activity | Ownership | Avg. Cost | Date |
|---|---|---|---|---|---|---|---|---|
| VPG | VISHAY PRECISION GROUP INC | 5.66% | 1.01M | $151.1M | -1.15%(-11.70K) | $27.47(+164.72%) | 2026-06-30 | |
| VIRT | VIRTU FINL INC | 4.78% | 2.14M | $127.6M | +76.77%(+930.33K) | $42.56(+41.02%) | 2026-06-30 | |
| TTMI | TTM TECHNOLOGIES INC | 3.56% | 507.8K | $95.0M | -30.19%(-219.66K) | $20.49(+583.26%) | 2026-06-30 | |
| MOD | MODINE MFG CO | 3.14% | 313.7K | $83.8M | -23.88%(-98.41K) | $82.90(+157.01%) | 2026-06-30 | |
| QLYS | QUALYS INC | 2.73% | 529.8K | $72.8M | +121.65%(+290.78K) | $113.83(+72.08%) | 2026-06-30 | |
| FOUR | SHIFT4 PMTS INC | 2.03% | 1.11M | $54.2M | +419.92%(+899.83K) | $51.82(-12.44%) | 2026-06-30 | |
| MEC | MAYVILLE ENGR CO INC | 1.82% | 1.30M | $48.7M | +58.23%(+478.12K) | $20.87(+20.22%) | 2026-06-30 | |
| ENVA | ENOVA INTL INC | 1.79% | 198.8K | $47.9M | +145.66%(+117.87K) | $135.33(+96.15%) | 2026-06-30 | |
| SMTC | SEMTECH CORP | 1.79% | 294.6K | $47.7M | -11.35%(-37.71K) | $49.03(+191.16%) | 2026-06-30 | |
| CLS | CELESTICA INC | 1.73% | 126.9K | $46.3M | -35.89%(-71.01K) | $78.00(+329.53%) | 2026-06-30 |
| Performance Metric | 3-Year Annualized | 3-Year Cumulative | 5-Year Annualized | 5-Year Cumulative |
|---|---|---|---|---|
| Top 20 Holdings Weighted | +39.71% | +172.72% | +19.33% | +141.96% |
| Top 20 Holdings Unweighted | +26.01% | +100.08% | +10.70% | +66.21% |
Portolan Capital Management LLC reports $2.67B in US-listed equity holdings across 148 positions in its most recent 13F filing. Its largest disclosed positions are VPG (5.7%), VIRT (4.8%) and TTMI (3.6%). The top 20 holdings account for 43.73% of reported assets. Its disclosed equity book has returned +172.72% on a three-year cumulative basis. Figures reflect the Q2 2026 filing.
Portfolio changes
Every reported change this quarter, grouped by direction. The signal is in the rotation, not any single trade.
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Holdings on this page are parsed from Portolan Capital Management LLC’s Form 13F filings with the U.S. Securities and Exchange Commission (CIK 1350290). View Portolan Capital Management LLC’s 13F filings on SEC