Portolan Capital Management, LLC
13F filer · CIK 1350290 · Boston, MA
Summary
Portolan Capital Management, LLC reported $2.67B across 148 positions in its 13F for 2026 Q2, filed Aug 14, 2026. The largest holdings are VPG (5.7%), VIRT (4.8%), TTMI (3.6%). Versus 2026 Q1, leaving options aside, it opened 36 new positions, added to 50, trimmed 58 and sold out of 32.
Reported value$2.67B
Positions148
Report period2026 Q2
FiledAug 14, 2026
New positions36
Added50
Trimmed58
Sold out32
Top 25 holdings
By reported value, options listed separately · change vs 2026 Q1
Weight 5.7%Value $151.13MPrice $70.88Shares 1.01M -1.15%Since Jun 30 -52.72%
Weight 4.8%Value $127.61MPrice $51.97Shares 2.14M +76.77%Since Jun 30 -12.76%
Weight 3.6%Value $94.98MPrice $124.19Shares 508K -30.19%Since Jun 30 -33.60%
Weight 3.1%Value $83.76MPrice $175.04Shares 314K -23.88%Since Jun 30 -34.45%
Weight 2.7%Value $72.84MPrice $173.83Shares 530K +121.65%Since Jun 30 +26.43%
Weight 2.0%Value $54.19MPrice $37.03Shares 1.11M +419.92%Since Jun 30 -23.87%
Weight 1.8%Value $48.67MPrice $16.85Shares 1.30M +58.23%Since Jun 30 -55.02%
Weight 1.8%Value $47.86MPrice $170.02Shares 199K +145.66%Since Jun 30 -29.37%
Weight 1.8%Value $47.68MPrice $174.78Shares 295K -11.35%Since Jun 30 +7.99%
Weight 1.7%Value $46.28MPrice $356.53Shares 127K -35.89%Since Jun 30 -2.27%
Weight 1.7%Value $44.17MPrice $485.54Shares 82K +28.51%Since Jun 30 -10.39%
Weight 1.6%Value $42.58MPrice $6.15Shares 7.03M +151.73%Since Jun 30 +1.49%
Weight 1.6%Value $41.70MPrice $187.23Shares 146K +92.05%Since Jun 30 -34.62%
Weight 1.6%Value $41.51MPrice $54.98Shares 546KSince Jun 30 -27.67%
Weight 1.5%Value $39.25MPrice $320.70Shares 105K -0.10%Since Jun 30 -13.93%
Weight 1.4%Value $37.12MPrice $113.04Shares 229K -48.32%Since Jun 30 -30.25%
Weight 1.4%Value $37.02MPrice $112.10Shares 360K +11.20%Since Jun 30 +8.91%
Weight 1.4%Value $36.95MPrice $16.83Shares 2.46M +14.53%Since Jun 30 +11.90%
Weight 1.4%Value $36.69MPrice $108.45Shares 310K -26.71%Since Jun 30 -8.26%
Weight 1.3%Value $35.95MPrice $10.88Shares 3.49M +20.59%Since Jun 30 +5.63%
Weight 1.3%Value $34.70MPrice $303.50Shares 90K +10.71%Since Jun 30 -21.02%
Weight 1.2%Value $32.75MPrice $156.48Shares 137K +154.74%Since Jun 30 -34.30%
Weight 1.2%Value $32.03MPrice $99.74Shares 289K -30.83%Since Jun 30 -10.10%
Weight 1.2%Value $30.87MPrice $227.07Shares 143K +20.57%Since Jun 30 +5.10%
Weight 1.1%Value $30.44MPrice $49.07Shares 402K +58.51%Since Jun 30 -35.26%
| Stock | Weight | Value | Since Jun 30 | Shares change | Action |
|---|---|---|---|---|---|
| 5.7% | $151.13M | -52.72% | -1.15% | Trim | |
| 4.8% | $127.61M | -12.76% | +76.77% | Add | |
| 3.6% | $94.98M | -33.60% | -30.19% | Trim | |
| 3.1% | $83.76M | -34.45% | -23.88% | Trim | |
| 2.7% | $72.84M | +26.43% | +121.65% | Add | |
| 2.0% | $54.19M | -23.87% | +419.92% | Add | |
| 1.8% | $48.67M | -55.02% | +58.23% | Add | |
| 1.8% | $47.86M | -29.37% | +145.66% | Add | |
| 1.8% | $47.68M | +7.99% | -11.35% | Trim | |
| 1.7% | $46.28M | -2.27% | -35.89% | Trim | |
| 1.7% | $44.17M | -10.39% | +28.51% | Add | |
| 1.6% | $42.58M | +1.49% | +151.73% | Add | |
| 1.6% | $41.70M | -34.62% | +92.05% | Add | |
| 1.6% | $41.51M | -27.67% | — | New | |
| 1.5% | $39.25M | -13.93% | -0.10% | Trim | |
| 1.4% | $37.12M | -30.25% | -48.32% | Trim | |
| 1.4% | $37.02M | +8.91% | +11.20% | Add | |
| 1.4% | $36.95M | +11.90% | +14.53% | Add | |
| 1.4% | $36.69M | -8.26% | -26.71% | Trim | |
| 1.3% | $35.95M | +5.63% | +20.59% | Add | |
| 1.3% | $34.70M | -21.02% | +10.71% | Add | |
| 1.2% | $32.75M | -34.30% | +154.74% | Add | |
| 1.2% | $32.03M | -10.10% | -30.83% | Trim | |
| 1.2% | $30.87M | +5.10% | +20.57% | Add | |
| 1.1% | $30.44M | -35.26% | +58.51% | Add |
Weight is the share of the reported 13F value, including options at notional value. “Since Jun 30” compares the latest close with the quarter-end price implied by the filing (value ÷ shares).
Largest buys in 2026 Q2
Largest sells in 2026 Q2
Source: SEC Form 13F, values as reported by the filer. Filings lag up to 45 days after quarter end and cover only certain long positions. Research only, not investment advice.