Portolan Capital Management, LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 14, 2026), Portolan Capital Management, LLC reported 148 stock positions worth $2.7 billion. Its top holding was Vishay Precision (VPG) at 5.7% of the portfolio, followed by Virtu Financial Class A (VIRT, 4.8%) and TTM Technologies (TTMI, 3.6%). Compared with Q1 2026, it opened 36 new positions, sold out of 32, added to 49 and reduced 59. The biggest buy was Virtu Financial Class A (VIRT, shares +77%) and the biggest sale an exit from PBF Energy Class A (PBF).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0001350290
- Portfolio Value
- $2.7B (Q2 2026)
- SEC Filing
- 0001104659-26-096980 ↗ filed Aug 14, 2026
Holdings Value
Holdings 148 stocks · $2.7B
| VPG Vishay Precision Group | 5.66% | 1,008,167 | $151.1M | Reduce -1.1% |
| VIRT Virtu Financial Inc. Class A | 4.78% | 2,142,215 | $127.6M | Add +76.8% |
| TTMI TTM Technologies | 3.56% | 507,838 | $95.0M | Reduce -30.2% |
| MOD Modine Manufacturing Co. | 3.14% | 313,683 | $83.8M | Reduce -23.9% |
| QLYS Qualys Inc. | 2.73% | 529,807 | $72.8M | Add +121.7% |
| FOUR SHIFT4 Payments Inc. Class A | 2.03% | 1,114,116 | $54.2M | Add +419.9% |
| MEC Mayville Engineering Co. Inc. | 1.82% | 1,299,256 | $48.7M | Add +58.2% |
| ENVA Enova International Inc. | 1.79% | 198,795 | $47.9M | Add +145.7% |
| SMTC Semtech Corp. | 1.79% | 294,619 | $47.7M | Reduce -11.3% |
| CLS Celestica Inc. | 1.73% | 126,856 | $46.3M | Reduce -35.9% |
| UTHR United Therapeutics Corp. | 1.65% | 81,518 | $44.2M | Add +28.5% |
| GENI Genius Sports Ltd. | 1.59% | 7,025,809 | $42.6M | Add +151.7% |
| POWL Powell Industries Inc. | 1.56% | 145,631 | $41.7M | Reduce -36.0% |
| PENG Penguin Solutions Inc. | 1.55% | 546,173 | $41.5M | New |
| DAVE Dave Inc. | 1.47% | 105,338 | $39.2M | Reduce -0.1% |
| FLEX Flex Ltd. | 1.39% | 229,027 | $37.1M | Reduce -48.3% |
| ALNT Allient Inc. | 1.39% | 359,685 | $37.0M | Add +11.2% |
| PRCH Porch Group Inc. | 1.38% | 2,456,451 | $36.9M | Add +14.5% |
| AKAM Akamai Technologies Inc. | 1.37% | 310,361 | $36.7M | Reduce -26.7% |
| CADL Candel Therapeutics Inc. | 1.35% | 3,490,398 | $36.0M | Add +20.6% |
| TLN Talen Energy Corp. | 1.30% | 90,312 | $34.7M | Add +10.7% |
| RRX Regal Rexnord Corp. | 1.23% | 137,498 | $32.8M | Add +154.7% |
| LNTH Lantheus Holdings Inc. | 1.20% | 288,691 | $32.0M | Reduce -30.8% |
| BIIB Biogen Inc. | 1.16% | 142,856 | $30.9M | Add +20.6% |
| VECO Veeco Instruments Inc. | 1.14% | 401,639 | $30.4M | Add +58.5% |
| LUXE Luxexperience BV | 1.13% | 4,053,147 | $30.1M | Add +8.6% |
| ZETA Zeta Global Holdings Corp. Class A | 1.11% | 1,502,738 | $29.6M | Add +209.0% |
| CLBT Cellebrite Di Ltd. | 1.06% | 1,932,514 | $28.2M | Reduce -11.4% |
| SRAD Sportradar Group AG-A | 1.02% | 1,819,949 | $27.2M | New |
| GOOS Canada Goose Holdings Inc. | 0.98% | 2,750,523 | $26.2M | Reduce -14.5% |
| BAND Bandwidth Inc. Class A | 0.98% | 412,701 | $26.1M | New |
| WRBY Warby Parker Inc. Class A | 0.96% | 843,862 | $25.6M | Add +68.5% |
| KTB Kontoor Brands Inc. | 0.91% | 292,115 | $24.3M | New |
| OSK Oshkosh Corp. | 0.91% | 157,641 | $24.2M | Add +766.9% |
| ECPG Encore Capital Group Inc. | 0.89% | 255,715 | $23.9M | New |
| TWLO Twilio Inc. Class A | 0.89% | 115,397 | $23.8M | Add +54.3% |
| SEZL Sezzle Inc. | 0.87% | 135,743 | $23.3M | Add +93.8% |
| RELY Remitly Global Inc. | 0.85% | 1,017,592 | $22.8M | Add +45.8% |
| ACMR Acm Research Inc. Class A | 0.84% | 177,432 | $22.5M | Add +113.1% |
| ESI Element Solutions Inc. | 0.84% | 469,213 | $22.4M | Add +112.1% |
| NOK Nokia Corp.-Spon ADR | 0.82% | 1,645,761 | $21.9M | Reduce -31.3% |
| BB Blackberry Ltd. | 0.81% | 1,714,461 | $21.7M | New |
| IFF Intl Flavors & Fragrances filed as INTERNATIONAL FLAVORS&FRAGRA | 0.80% | 269,229 | $21.3M | New |
| PLSE Pulse Biosciences Inc. | 0.78% | 753,333 | $20.9M | Add +2.7% |
| MOG.A Moog Inc. Class A | 0.78% | 49,274 | $20.9M | Add +67.4% |
| REAL BROKERAGE INC/THE filed as THE REAL BROKERAGE INC | 0.75% | 11,042,364 | $20.1M | Reduce -23.9% |
| CDNA Caredx Inc. | 0.73% | 684,805 | $19.5M | Add +101.2% |
| PARR Par Pacific Holdings Inc. | 0.72% | 341,863 | $19.2M | Reduce -50.7% |
| VSH Vishay Intertechnology Inc. | 0.71% | 351,515 | $18.9M | New |
| TTWO Take-Two Interactive Softwre | 0.68% | 72,487 | $18.1M | Add +125.0% |
| GTES Gates Industrial Corp. UK Ltd. | 0.67% | 641,587 | $17.9M | New |
| MAMA Mama's Creations Inc. | 0.66% | 984,869 | $17.6M | Reduce -16.3% |
| KRUS Kura Sushi USA Inc. Class A | 0.65% | 302,010 | $17.4M | Add +0.3% |
| SANM Sanmina Corp. | 0.65% | 68,255 | $17.3M | Add +149.7% |
| PKE Park Aerospace Corp. | 0.64% | 447,390 | $17.1M | Add +8.9% |
| GHM Graham Corp. | 0.63% | 136,925 | $16.9M | Add +32.2% |
| BELFB Bel Fuse Inc. Class B | 0.60% | 47,856 | $15.9M | Reduce -10.0% |
| ONON On Holding AG Class A filed as ON HLDG AG | 0.58% | 441,137 | $15.6M | Add +117.9% |
| AS Amer Sports Inc. | 0.57% | 452,880 | $15.3M | Add +26.6% |
| COHU Cohu Inc. | 0.57% | 206,120 | $15.2M | New |
| JBL Jabil Inc. | 0.56% | 38,929 | $15.0M | Reduce -49.6% |
| ADEA Adeia Inc. | 0.55% | 443,060 | $14.6M | Reduce -39.3% |
| VICR Vicor Corp. | 0.54% | 38,081 | $14.5M | Add +42.8% |
| TENB Tenable Holdings Inc. | 0.54% | 387,923 | $14.3M | New |
| GEHC GE Healthcare Technology | 0.53% | 222,393 | $14.2M | New |
| CXT Crane NXT Co. | 0.52% | 271,524 | $13.9M | New |
| PACK Ranpak Holdings Corp. | 0.52% | 1,894,855 | $13.9M | Reduce -2.7% |
| ONTO Onto Innovation Inc. | 0.52% | 36,503 | $13.8M | Add +64.0% |
| WGS Genedx Holdings Corp. | 0.51% | 200,315 | $13.8M | Add +95.3% |
| FORR Forrester Research Inc. | 0.51% | 1,623,925 | $13.7M | Add +5.4% |
| HZO Marinemax Inc. | 0.47% | 344,358 | $12.6M | New |
| BIO Bio-Rad Laboratories-A | 0.47% | 42,620 | $12.5M | Add +200.7% |
| QMCO Quantum Corp. | 0.42% | 1,020,120 | $11.2M | New |
| BIDU Baidu Inc. - Spon ADR | 0.41% | 95,863 | $11.0M | Reduce -73.8% |
| RACE Ferrari NV | 0.41% | 29,079 | $10.8M | New |
| DGII Digi International Inc. | 0.40% | 141,243 | $10.6M | Reduce -17.0% |
| LASR Nlight Inc. | 0.40% | 151,867 | $10.6M | Reduce -32.7% |
| VIAV Viavi Solutions Inc. | 0.39% | 220,118 | $10.5M | Add +50.9% |
| BOOT Boot Barn Holdings Inc. | 0.39% | 63,759 | $10.5M | New |
| LPTH Lightpath Technologies Inc. Class A | 0.39% | 629,168 | $10.3M | Reduce -39.5% |
| FEIM Frequency Electronics Inc. | 0.38% | 152,818 | $10.1M | Add +1.8% |
| HALO Halozyme Therapeutics Inc. | 0.37% | 127,498 | $10.0M | New |
| ECO Okeanis Eco Tankers Corp. | 0.37% | 195,997 | $9.8M | Reduce -63.6% |
| ZGN Ermenegildo Zegna NV | 0.37% | 753,948 | $9.8M | Add +6.1% |
| SG Sweetgreen Inc. Class A | 0.34% | 1,029,016 | $9.1M | New |
| TPR Tapestry Inc. | 0.34% | 61,688 | $9.0M | Add +262.1% |
| SEI Solaris Energy Infrastructur | 0.32% | 107,401 | $8.6M | Add +284.5% |
| ATEN A10 Networks Inc. | 0.32% | 226,920 | $8.5M | New |
| AMBA Ambarella Inc. | 0.31% | 97,072 | $8.3M | Reduce -10.7% |
| TGLS Tecnoglass Holdings Inc. | 0.31% | 176,254 | $8.3M | New |
| QTRX Quanterix Corp. | 0.31% | 1,899,308 | $8.2M | Reduce -35.5% |
| TGEN Tecogen Inc./Waltham Ma | 0.30% | 1,551,113 | $8.1M | Add +249.7% |
| HQY Healthequity Inc. | 0.30% | 89,274 | $8.1M | Reduce -12.2% |
| TSEM Tower Semiconductor Ltd. | 0.30% | 30,557 | $8.0M | Reduce -4.6% |
| CSTL Castle Biosciences Inc. | 0.29% | 328,818 | $7.8M | Reduce -75.7% |
| SILC Silicom Ltd. | 0.29% | 162,466 | $7.8M | New |
| CIEN Ciena Corp. | 0.28% | 15,272 | $7.5M | Reduce -17.3% |
| EBAY eBay Inc. | 0.28% | 65,741 | $7.3M | Reduce -47.9% |
| RBA RB Global Inc. | 0.27% | 63,009 | $7.3M | New |
| XMTR Xometry Inc. Class A | 0.26% | 73,163 | $7.1M | New |
Portfolio Sells Q1 2026 → Q2 2026
| PBF PBF Energy Inc. Class A | Sold out | 0.00% | −2.03 |
| CRGY Crescent Energy Inc. Class A | Sold out | 0.00% | −1.87 |
| BIDU Baidu Inc. - Spon ADR | Reduce -73.8% | 0.41% | −1.76 |
| MOD Modine Manufacturing Co. | Reduce -23.9% | 3.14% | −1.62 |
| PARR Par Pacific Holdings Inc. | Reduce -50.7% | 0.72% | −1.60 |
| CSTL Castle Biosciences Inc. | Reduce -75.7% | 0.29% | −1.47 |
| FN Fabrinet | Reduce -88.3% | 0.14% | −1.38 |
| CNR Core Natural Resources Inc. | Sold out | 0.00% | −1.32 |
| MUSA Murphy USA Inc. | Sold out | 0.00% | −1.26 |
| CLS Celestica Inc. | Reduce -35.9% | 1.73% | −1.23 |
| AKAM Akamai Technologies Inc. | Reduce -26.7% | 1.37% | −1.21 |
| REAL BROKERAGE INC/THE | Reduce -23.9% | 0.75% | −1.18 |
| CRCL Circle Internet Group Inc. | Sold out | 0.00% | −1.09 |
| ECO Okeanis Eco Tankers Corp. | Reduce -63.6% | 0.37% | −1.08 |
| PRIM Primoris Services Corp. | Sold out | 0.00% | −0.99 |
| UPWK Upwork Inc. | Sold out | 0.00% | −0.92 |
| GOOS Canada Goose Holdings Inc. | Reduce -14.5% | 0.98% | −0.90 |
| DHT DHT Holdings Inc. | Reduce -71.2% | 0.19% | −0.87 |
| KTOS Kratos Defense & Security | Reduce -74.9% | 0.12% | −0.85 |
| HAFN Hafnia Ltd. | Reduce -81.2% | 0.09% | −0.70 |
| POWL Powell Industries Inc. | Reduce -36.0% | 1.56% | −0.62 |
| CLBT Cellebrite Di Ltd. | Reduce -11.4% | 1.06% | −0.54 |
| JBL Jabil Inc. | Reduce -49.6% | 0.56% | −0.53 |
| AMSC American Superconductor Corp. | Reduce -90.1% | 0.05% | −0.49 |
| LNTH Lantheus Holdings Inc. | Reduce -30.8% | 1.20% | −0.49 |
| LPRO Open Lending Corp. | Reduce -97.3% | 0.02% | −0.44 |
| RPAY Repay Holdings Corp. | Sold out | 0.00% | −0.40 |
| ADEA Adeia Inc. | Reduce -39.3% | 0.55% | −0.39 |
| EVLV Evolv Technologies Holdings | Reduce -50.2% | 0.19% | −0.38 |
| ACLS Axcelis Technologies Inc. | Sold out | 0.00% | −0.38 |
| VNET Vnet Group Inc.-ADR | Sold out | 0.00% | −0.37 |
| EBAY eBay Inc. | Reduce -47.9% | 0.28% | −0.34 |
| NOG Northern Oil and Gas Inc. | Sold out | 0.00% | −0.32 |
| BL Blackline Inc. | Sold out | 0.00% | −0.31 |
| MAMA Mama's Creations Inc. | Reduce -16.3% | 0.66% | −0.30 |
| CENX Century Aluminum Company | Sold out | 0.00% | −0.30 |
| LASR Nlight Inc. | Reduce -32.7% | 0.40% | −0.29 |
| TALO Talos Energy Inc. | Reduce -96.1% | 0.01% | −0.28 |
| DBRG Digitalbridge Group Inc. | Reduce -84.8% | 0.03% | −0.27 |
| MIAX Miami International Holdings | Sold out | 0.00% | −0.27 |
| TLX Telix Pharmaceuticals Ltd. | Reduce -95.3% | 0.01% | −0.26 |
| AVAV Aerovironment Inc. | Sold out | 0.00% | −0.26 |
| XPEV Xpeng Inc. - ADR | Sold out | 0.00% | −0.25 |
| PSNL Personalis Inc. | Sold out | 0.00% | −0.25 |
| IESC Ies Holdings Inc. | Reduce -83.7% | 0.05% | −0.25 |
| IIIV I3 Verticals Inc. Class A | Sold out | 0.00% | −0.25 |
| QTRX Quanterix Corp. | Reduce -35.5% | 0.31% | −0.24 |
| NXT Nextpower Inc. | Reduce -52.2% | 0.12% | −0.24 |
| PUMP Propetro Holding Corp. | Sold out | 0.00% | −0.24 |
| HNST The Honest Co. Inc. | Reduce -42.9% | 0.24% | −0.24 |
Portfolio Buys Q1 2026 → Q2 2026
| VIRT Virtu Financial Inc. Class A | Add +76.8% | 4.78% | +1.94 |
| QLYS Qualys Inc. | Add +121.7% | 2.73% | +1.61 |
| PENG Penguin Solutions Inc. | New | 1.55% | +1.55 |
| FOUR SHIFT4 Payments Inc. Class A | Add +419.9% | 2.03% | +1.53 |
| ENVA Enova International Inc. | Add +145.7% | 1.79% | +1.21 |
| MEC Mayville Engineering Co. Inc. | Add +58.2% | 1.82% | +1.04 |
| SRAD Sportradar Group AG-A | New | 1.02% | +1.02 |
| BAND Bandwidth Inc. Class A | New | 0.98% | +0.98 |
| GENI Genius Sports Ltd. | Add +151.7% | 1.59% | +0.94 |
| KTB Kontoor Brands Inc. | New | 0.91% | +0.91 |
| ECPG Encore Capital Group Inc. | New | 0.89% | +0.89 |
| BB Blackberry Ltd. | New | 0.81% | +0.81 |
| IFF Intl Flavors & Fragrances | New | 0.80% | +0.80 |
| OSK Oshkosh Corp. | Add +766.9% | 0.91% | +0.76 |
| VSH Vishay Intertechnology Inc. | New | 0.71% | +0.71 |
| ZETA Zeta Global Holdings Corp. Class A | Add +209.0% | 1.11% | +0.70 |
| RRX Regal Rexnord Corp. | Add +154.7% | 1.23% | +0.69 |
| VECO Veeco Instruments Inc. | Add +58.5% | 1.14% | +0.68 |
| GTES Gates Industrial Corp. UK Ltd. | New | 0.67% | +0.67 |
| ACMR Acm Research Inc. Class A | Add +113.1% | 0.84% | +0.67 |
| SEZL Sezzle Inc. | Add +93.8% | 0.87% | +0.64 |
| CADL Candel Therapeutics Inc. | Add +20.6% | 1.35% | +0.59 |
| COHU Cohu Inc. | New | 0.57% | +0.57 |
| PRCH Porch Group Inc. | Add +14.5% | 1.38% | +0.56 |
| TENB Tenable Holdings Inc. | New | 0.54% | +0.54 |
| GEHC GE Healthcare Technology | New | 0.53% | +0.53 |
| CXT Crane NXT Co. | New | 0.52% | +0.52 |
| HZO Marinemax Inc. | New | 0.47% | +0.47 |
| SANM Sanmina Corp. | Add +149.7% | 0.65% | +0.46 |
| ESI Element Solutions Inc. | Add +112.1% | 0.84% | +0.44 |
| QMCO Quantum Corp. | New | 0.42% | +0.42 |
| CDNA Caredx Inc. | Add +101.2% | 0.73% | +0.42 |
| RACE Ferrari NV | New | 0.41% | +0.41 |
| WRBY Warby Parker Inc. Class A | Add +68.5% | 0.96% | +0.40 |
| BOOT Boot Barn Holdings Inc. | New | 0.39% | +0.39 |
| TWLO Twilio Inc. Class A | Add +54.3% | 0.89% | +0.39 |
| HALO Halozyme Therapeutics Inc. | New | 0.37% | +0.37 |
| ALNT Allient Inc. | Add +11.2% | 1.39% | +0.37 |
| TTWO Take-Two Interactive Softwre | Add +125.0% | 0.68% | +0.34 |
| SG Sweetgreen Inc. Class A | New | 0.34% | +0.34 |
| MOG.A Moog Inc. Class A | Add +67.4% | 0.78% | +0.32 |
| ATEN A10 Networks Inc. | New | 0.32% | +0.32 |
| VICR Vicor Corp. | Add +42.8% | 0.54% | +0.31 |
| TGLS Tecnoglass Holdings Inc. | New | 0.31% | +0.31 |
| SILC Silicom Ltd. | New | 0.29% | +0.29 |
| RBA RB Global Inc. | New | 0.27% | +0.27 |
| ONTO Onto Innovation Inc. | Add +64.0% | 0.52% | +0.27 |
| RELY Remitly Global Inc. | Add +45.8% | 0.85% | +0.27 |
| XMTR Xometry Inc. Class A | New | 0.26% | +0.26 |
| BIO Bio-Rad Laboratories-A | Add +200.7% | 0.47% | +0.26 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 148 | $2.7B | VPG, VIRT, TTMI, MOD, QLYS |
| Q1 2026 | 144 | $1.9B | MOD, TTMI, CLS, VIRT, AKAM |
| Q4 2025 | 155 | $1.9B | TTMI, MOD, CSTL, CLS, AKAM |
| Q3 2025 | 119 | $1.8B | MOD, TTMI, ELF, DBRG, CLS |
| Q2 2025 | 118 | $1.6B | CLS, KTOS, ELF, AVAV, MOD |
| Q1 2025 | 109 | $1.3B | LNTH, SLM, KTOS, GENI, MOD |
| Q4 2024 | 131 | $1.5B | LNTH, CLS, SMTC, MOD, HNST |
| Q3 2024 | 129 | $1.4B | LNTH, ZETA, KTOS, TLN, CLS |
| Q2 2024 | 117 | $1.2B | LNTH, CLS, SMCI, ZETA, KTOS |
| Q1 2024 | 116 | $1.3B | SMCI, CLS, LNTH, ELF, BIO |