Portolan Capital Management, LLC
In its 13F for Q1 2025 (holdings as of March 31, 2025, filed May 15, 2025), Portolan Capital Management, LLC reported 109 stock positions worth $1.3 billion. Its top holding was Lantheus (LNTH) at 6.4% of the portfolio, followed by SLM (SLM, 3.4%) and Kratos Defense & Security (KTOS, 3.3%). Compared with Q4 2024, it opened 21 new positions, sold out of 43, added to 53 and reduced 35. The biggest buy was SLM (SLM, shares +68%) and the biggest sale Semtech (SMTC, shares −90%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0001350290
- Portfolio Value
- $1.3B (Q1 2025)
- SEC Filing
- 0001104659-25-049320 ↗ filed May 15, 2025
Holdings Value
Holdings 109 stocks · $1.3B
| LNTH Lantheus Holdings Inc. | 6.43% | 867,309 | $84.6M | Add +6.7% |
| SLM SLM Corp. | 3.38% | 1,512,274 | $44.4M | Add +67.9% |
| KTOS Kratos Defense & Security | 3.30% | 1,460,730 | $43.4M | Add +8.4% |
| GENI Genius Sports Ltd. | 3.26% | 4,281,255 | $42.9M | Add +39.5% |
| MOD Modine Manufacturing Co. | 2.88% | 493,575 | $37.9M | Add +50.1% |
| FOUR SHIFT4 Payments Inc. Class A | 2.52% | 406,499 | $33.2M | Add +188.4% |
| EBAY eBay Inc. | 2.44% | 474,658 | $32.1M | Add +99.3% |
| GTES Gates Industrial Corp. UK Ltd. | 2.42% | 1,731,408 | $31.9M | Add +55.0% |
| CLS Celestica Inc. | 2.35% | 392,920 | $31.0M | Reduce -37.3% |
| HNST The Honest Co. Inc. | 1.97% | 5,519,206 | $25.9M | Add +3.0% |
| CSTL Castle Biosciences Inc. | 1.93% | 1,265,223 | $25.3M | Add +62.9% |
| ELF Elf Beauty Inc. | 1.89% | 395,252 | $24.8M | Add +71.8% |
| OPRA Opera Ltd.-ADR | 1.85% | 1,529,691 | $24.4M | Add +104.4% |
| PRCH Porch Group Inc. | 1.82% | 3,292,276 | $24.0M | Add +43.2% |
| RDNT Radnet Inc. | 1.81% | 478,406 | $23.8M | Add +12.7% |
| TREE Lendingtree Inc. | 1.68% | 438,795 | $22.1M | New |
| TTMI TTM Technologies | 1.59% | 1,021,297 | $20.9M | Reduce -21.5% |
| CROX Crocs Inc. | 1.57% | 194,210 | $20.6M | Add +138.5% |
| DBRG Digitalbridge Group Inc. | 1.52% | 2,266,652 | $20.0M | Add +186.2% |
| LUXE Luxexperience BV filed as MYT NETHERLANDS PARENT B V | 1.51% | 2,628,728 | $19.9M | Add +38.1% |
| VPG Vishay Precision Group | 1.50% | 820,973 | $19.8M | Add +66.8% |
| IIIV I3 Verticals Inc. Class A | 1.48% | 789,156 | $19.5M | Add +16.7% |
| LQDT Liquidity Services Inc. | 1.48% | 626,358 | $19.4M | New |
| QTRX Quanterix Corp. | 1.47% | 2,963,397 | $19.3M | Add +14.5% |
| CLBT Cellebrite Di Ltd. | 1.46% | 988,992 | $19.2M | Add +8.1% |
| KMPR Kemper Corp. | 1.46% | 286,557 | $19.2M | Add +24.5% |
| KRUS Kura Sushi USA Inc. Class A | 1.45% | 372,999 | $19.1M | Reduce -0.1% |
| TPR Tapestry Inc. | 1.32% | 247,107 | $17.4M | Add +24.9% |
| PAYO Payoneer Global Inc. | 1.25% | 2,243,548 | $16.4M | Add +3.2% |
| DKNG Draftkings Inc. Class A | 1.24% | 492,422 | $16.4M | Add +53.6% |
| ACI Albertsons Cos Inc. Class A | 1.19% | 709,576 | $15.6M | Add +44.8% |
| SMCI Super Micro Computer Inc. | 1.13% | 433,863 | $14.9M | Add +363.1% |
| VIRT Virtu Financial Inc. Class A | 1.13% | 388,844 | $14.8M | Reduce -26.4% |
| UTHR United Therapeutics Corp. | 1.06% | 45,068 | $13.9M | Add +216.3% |
| QNST Quinstreet Inc. | 1.06% | 778,296 | $13.9M | Reduce -15.2% |
| BELFB Bel Fuse Inc. Class B | 1.05% | 184,224 | $13.8M | Reduce -11.6% |
| BIDU Baidu Inc. - Spon ADR | 0.94% | 134,546 | $12.4M | New |
| DY Dycom Industries Inc. | 0.94% | 81,002 | $12.3M | Add +248.4% |
| PBPB Potbelly Corp. | 0.92% | 1,276,612 | $12.1M | Add +29.4% |
| MAMA Mama's Creations Inc. | 0.90% | 1,817,293 | $11.8M | Add +122.0% |
| SKX Skechers USA Inc. Class A | 0.86% | 199,867 | $11.3M | Add +0.5% |
| SG Sweetgreen Inc. Class A | 0.84% | 439,850 | $11.0M | Add +43.3% |
| RPRX Royalty Pharma PLC Class A | 0.83% | 352,257 | $11.0M | Add +2.4% |
| ENVA Enova International Inc. | 0.83% | 112,513 | $10.9M | Reduce -46.0% |
| WEAV Weave Communications Inc. | 0.80% | 952,162 | $10.6M | Add +119.7% |
| ZETA Zeta Global Holdings Corp. Class A | 0.76% | 741,852 | $10.1M | Add +11.7% |
| NOG Northern Oil and Gas Inc. | 0.76% | 331,955 | $10.0M | Add +68.5% |
| SRAD Sportradar Group AG-A | 0.72% | 438,020 | $9.5M | Reduce -38.8% |
| FLEX Flex Ltd. | 0.71% | 280,908 | $9.3M | Reduce -35.5% |
| STKL Sunopta Inc. | 0.70% | 1,894,080 | $9.2M | Add +13.6% |
| POWL Powell Industries Inc. | 0.69% | 53,224 | $9.1M | Add +322.6% |
| TTWO Take-Two Interactive Softwre | 0.67% | 42,729 | $8.9M | Add +0.6% |
| LUCK Lucky Strike Entertainment C | 0.65% | 880,427 | $8.6M | Reduce -38.4% |
| GES Guess? Inc. | 0.65% | 776,182 | $8.6M | New |
| TLN Talen Energy Corp. | 0.65% | 42,670 | $8.5M | Reduce -72.4% |
| UPWK Upwork Inc. | 0.64% | 644,548 | $8.4M | New |
| PSIX Power Solutions Internationa | 0.57% | 296,442 | $7.5M | Reduce -13.1% |
| GPOR Gulfport Energy Corp. | 0.57% | 40,488 | $7.5M | New |
| CDNA Caredx Inc. | 0.56% | 411,683 | $7.3M | New |
| META Meta Platforms Inc. Class A | 0.55% | 12,443 | $7.2M | Reduce -15.4% |
| ZGN Ermenegildo Zegna NV | 0.54% | 957,202 | $7.1M | Add +135.9% |
| HZO Marinemax Inc. | 0.53% | 322,105 | $6.9M | Add +52.0% |
| NTGR Netgear Inc. | 0.53% | 283,092 | $6.9M | Add +47.3% |
| LIND Lindblad Expeditions Holding | 0.49% | 689,246 | $6.4M | Add +26.6% |
| MRX Marex UK Holdings Ltd. filed as MAREX GROUP PLC | 0.47% | 174,196 | $6.2M | Reduce -22.1% |
| HCAT Health Catalyst Inc. | 0.45% | 1,317,079 | $6.0M | Add +75.8% |
| CTOS Custom Truck One Source Inc. | 0.45% | 1,397,327 | $5.9M | Reduce -3.7% |
| BV Brightview Holdings Inc. | 0.41% | 421,336 | $5.4M | Add +29.0% |
| GDOT Green Dot Corp. Class A | 0.41% | 636,067 | $5.4M | New |
| BIO Bio-Rad Laboratories-A | 0.40% | 21,740 | $5.3M | Reduce -28.9% |
| TGLS Tecnoglass Holdings Inc. | 0.40% | 73,148 | $5.2M | Reduce -35.9% |
| CELH Celsius Holdings Inc. | 0.39% | 142,549 | $5.1M | New |
| CADL Candel Therapeutics Inc. | 0.38% | 881,184 | $5.0M | Add +16.9% |
| GEN Gen Digital Inc. | 0.38% | 187,169 | $5.0M | New |
| WRBY Warby Parker Inc. Class A | 0.37% | 267,675 | $4.9M | Reduce -39.4% |
| MYGN Myriad Genetics Inc. | 0.37% | 549,922 | $4.9M | New |
| ECPG Encore Capital Group Inc. | 0.37% | 140,726 | $4.8M | Reduce -34.7% |
| KOS Kosmos Energy Ltd. | 0.35% | 2,011,814 | $4.6M | Add +24.4% |
| HUCK Huckleberry AI Inc. filed as DOMO INC | 0.34% | 584,277 | $4.5M | New |
| OPRT Oportun Financial Corp. | 0.34% | 818,354 | $4.5M | New |
| RMNI Rimini Street Inc. | 0.33% | 1,235,224 | $4.3M | New |
| TPB Turning Point Brands Inc. | 0.32% | 70,451 | $4.2M | Add +10.9% |
| REAL BROKERAGE INC/THE filed as THE REAL BROKERAGE INC | 0.32% | 1,023,099 | $4.2M | New |
| ESTA Establishment Labs Holdings | 0.31% | 100,829 | $4.1M | Reduce -48.0% |
| GEHC GE Healthcare Technology | 0.29% | 47,443 | $3.8M | New |
| FIVN FIVE9 Inc. | 0.29% | 138,255 | $3.8M | New |
| VKTX Viking Therapeutics Inc. | 0.25% | 138,748 | $3.4M | Add +8.0% |
| INVE Inve Technologies Inc. filed as IDENTIV INC | 0.25% | 1,044,652 | $3.3M | Reduce -0.2% |
| TMDX Transmedics Group Inc. | 0.24% | 47,536 | $3.2M | New |
| PACK Ranpak Holdings Corp. | 0.24% | 573,622 | $3.1M | New |
| SMWB Similarweb Ltd. | 0.23% | 370,191 | $3.1M | Add +30.9% |
| NTRA Natera Inc. | 0.22% | 20,559 | $2.9M | Reduce -46.7% |
| RELY Remitly Global Inc. | 0.20% | 127,227 | $2.6M | Reduce -81.7% |
| EVER Everquote Inc. Class A | 0.20% | 100,552 | $2.6M | New |
| FORR Forrester Research Inc. | 0.20% | 280,114 | $2.6M | Add +11.4% |
| SMTC Semtech Corp. | 0.18% | 69,307 | $2.4M | Reduce -89.6% |
| MSFT Microsoft Corp. | 0.17% | 5,797 | $2.2M | Reduce -15.3% |
| GCO Genesco Inc. | 0.14% | 88,732 | $1.9M | Reduce -80.9% |
| BXC Bluelinx Holdings Inc. | 0.14% | 24,393 | $1.8M | Reduce -30.4% |
| CWST Casella Waste Systems Inc. Class A | 0.13% | 15,303 | $1.7M | Reduce -0.2% |
Portfolio Sells Q4 2024 → Q1 2025
| SMTC Semtech Corp. | Reduce -89.6% | 0.18% | −2.59 |
| SNAP Snap Inc. Class A | Sold out | 0.00% | −1.71 |
| CLS Celestica Inc. | Reduce -37.3% | 2.35% | −1.54 |
| TLN Talen Energy Corp. | Reduce -72.4% | 0.65% | −1.44 |
| RDDT Reddit Inc. Class A | Reduce -96.3% | 0.04% | −1.41 |
| GCO Genesco Inc. | Reduce -80.9% | 0.14% | −1.19 |
| CORZ Core Scientific Inc. | Sold out | 0.00% | −0.97 |
| RELY Remitly Global Inc. | Reduce -81.7% | 0.20% | −0.85 |
| AAOI Applied Optoelectronics Inc. | Sold out | 0.00% | −0.84 |
| KRUS Kura Sushi USA Inc. Class A | Reduce -0.1% | 1.45% | −0.82 |
| ORCL Oracle Corp. | Reduce -87.3% | 0.10% | −0.76 |
| GNRC Generac Holdings Inc. | Sold out | 0.00% | −0.74 |
| DELL Dell Technologies -C | Sold out | 0.00% | −0.68 |
| UBS UBS Group AG-Reg | Sold out | 0.00% | −0.66 |
| MLR Miller Industries Inc. | Sold out | 0.00% | −0.63 |
| TTMI TTM Technologies | Reduce -21.5% | 1.59% | −0.57 |
| VRT Vertiv Holdings Co. Class A | Reduce -89.8% | 0.05% | −0.57 |
| BILL Bill Holdings Inc. | Sold out | 0.00% | −0.56 |
| WDC Western Digital Corp. | Sold out | 0.00% | −0.52 |
| ENVA Enova International Inc. | Reduce -46.0% | 0.83% | −0.52 |
| PRIM Primoris Services Corp. | Reduce -90.5% | 0.04% | −0.51 |
| OSG Octave Specialty Group Inc. | Sold out | 0.00% | −0.50 |
| ULTA Ulta Beauty Inc. | Sold out | 0.00% | −0.49 |
| FLEX Flex Ltd. | Reduce -35.5% | 0.71% | −0.42 |
| SPWH Sportsman's Warehouse Holdin | Reduce -89.8% | 0.02% | −0.40 |
| STNG Scorpio Tankers Inc. | Sold out | 0.00% | −0.40 |
| MYRG MYR Group Inc./Delaware | Sold out | 0.00% | −0.38 |
| CDMO Avid Bioservices Inc. | Sold out | 0.00% | −0.38 |
| ALTG Alta Equipment Group Inc. | Sold out | 0.00% | −0.37 |
| QNST Quinstreet Inc. | Reduce -15.2% | 1.06% | −0.37 |
| OTLY Oatly Group AB | Sold out | 0.00% | −0.35 |
| WRBY Warby Parker Inc. Class A | Reduce -39.4% | 0.37% | −0.35 |
| BASE Couchbase Inc. | Sold out | 0.00% | −0.35 |
| AMPH Amphastar Pharmaceuticals Inc. | Sold out | 0.00% | −0.33 |
| ECPG Encore Capital Group Inc. | Reduce -34.7% | 0.37% | −0.33 |
| MXCT Maxcyte Inc. | Sold out | 0.00% | −0.32 |
| NVGS Navigator Holdings Ltd. | Sold out | 0.00% | −0.32 |
| LUCK Lucky Strike Entertainment C | Reduce -38.4% | 0.65% | −0.31 |
| GOOS Canada Goose Holdings Inc. | Sold out | 0.00% | −0.30 |
| CACI Caci International Inc. Class A | Sold out | 0.00% | −0.29 |
| ESTA Establishment Labs Holdings | Reduce -48.0% | 0.31% | −0.29 |
| BIO Bio-Rad Laboratories-A | Reduce -28.9% | 0.40% | −0.27 |
| TSEM Tower Semiconductor Ltd. | Sold out | 0.00% | −0.26 |
| KIDS Orthopediatrics Corp. | Reduce -83.2% | 0.06% | −0.26 |
| BLFS Biolife Solutions Inc. | Sold out | 0.00% | −0.24 |
| JBL Jabil Inc. | Sold out | 0.00% | −0.23 |
| INDI Indie Semiconductor Inc. Class A | Sold out | 0.00% | −0.23 |
| SEZL Sezzle Inc. | Sold out | 0.00% | −0.23 |
| NBIS Nebius Group NV | Sold out | 0.00% | −0.23 |
| ORN Orion Group Holdings Inc. | Sold out | 0.00% | −0.22 |
Portfolio Buys Q4 2024 → Q1 2025
| SLM SLM Corp. | Add +67.9% | 3.38% | +1.71 |
| TREE Lendingtree Inc. | New | 1.68% | +1.68 |
| LNTH Lantheus Holdings Inc. | Add +6.7% | 6.43% | +1.54 |
| FOUR SHIFT4 Payments Inc. Class A | Add +188.4% | 2.52% | +1.54 |
| LQDT Liquidity Services Inc. | New | 1.48% | +1.48 |
| GENI Genius Sports Ltd. | Add +39.5% | 3.26% | +1.47 |
| EBAY eBay Inc. | Add +99.3% | 2.44% | +1.45 |
| PRCH Porch Group Inc. | Add +43.2% | 1.82% | +1.06 |
| CROX Crocs Inc. | Add +138.5% | 1.57% | +0.97 |
| BIDU Baidu Inc. - Spon ADR | New | 0.94% | +0.94 |
| SMCI Super Micro Computer Inc. | Add +363.1% | 1.13% | +0.94 |
| DBRG Digitalbridge Group Inc. | Add +186.2% | 1.52% | +0.92 |
| KTOS Kratos Defense & Security | Add +8.4% | 3.30% | +0.90 |
| OPRA Opera Ltd.-ADR | Add +104.4% | 1.85% | +0.90 |
| GTES Gates Industrial Corp. UK Ltd. | Add +55.0% | 2.42% | +0.88 |
| VPG Vishay Precision Group | Add +66.8% | 1.50% | +0.73 |
| UTHR United Therapeutics Corp. | Add +216.3% | 1.06% | +0.72 |
| DY Dycom Industries Inc. | Add +248.4% | 0.94% | +0.67 |
| GES Guess? Inc. | New | 0.65% | +0.65 |
| UPWK Upwork Inc. | New | 0.64% | +0.64 |
| LUXE Luxexperience BV | Add +38.1% | 1.51% | +0.60 |
| GPOR Gulfport Energy Corp. | New | 0.57% | +0.57 |
| CDNA Caredx Inc. | New | 0.56% | +0.56 |
| ACI Albertsons Cos Inc. Class A | Add +44.8% | 1.19% | +0.54 |
| CSTL Castle Biosciences Inc. | Add +62.9% | 1.93% | +0.53 |
| POWL Powell Industries Inc. | Add +322.6% | 0.69% | +0.50 |
| MAMA Mama's Creations Inc. | Add +122.0% | 0.90% | +0.46 |
| TPR Tapestry Inc. | Add +24.9% | 1.32% | +0.45 |
| DKNG Draftkings Inc. Class A | Add +53.6% | 1.24% | +0.44 |
| IIIV I3 Verticals Inc. Class A | Add +16.7% | 1.48% | +0.43 |
| KMPR Kemper Corp. | Add +24.5% | 1.46% | +0.43 |
| GDOT Green Dot Corp. Class A | New | 0.41% | +0.41 |
| CELH Celsius Holdings Inc. | New | 0.39% | +0.39 |
| GEN Gen Digital Inc. | New | 0.38% | +0.38 |
| MYGN Myriad Genetics Inc. | New | 0.37% | +0.37 |
| HUCK Huckleberry AI Inc. | New | 0.34% | +0.34 |
| OPRT Oportun Financial Corp. | New | 0.34% | +0.34 |
| WEAV Weave Communications Inc. | Add +119.7% | 0.80% | +0.34 |
| RMNI Rimini Street Inc. | New | 0.33% | +0.33 |
| REAL BROKERAGE INC/THE | New | 0.32% | +0.32 |
| MOD Modine Manufacturing Co. | Add +50.1% | 2.88% | +0.31 |
| ZGN Ermenegildo Zegna NV | Add +135.9% | 0.54% | +0.31 |
| PBPB Potbelly Corp. | Add +29.4% | 0.92% | +0.30 |
| GEHC GE Healthcare Technology | New | 0.29% | +0.29 |
| FIVN FIVE9 Inc. | New | 0.29% | +0.29 |
| NOG Northern Oil and Gas Inc. | Add +68.5% | 0.76% | +0.27 |
| TMDX Transmedics Group Inc. | New | 0.24% | +0.24 |
| RPRX Royalty Pharma PLC Class A | Add +2.4% | 0.83% | +0.24 |
| PACK Ranpak Holdings Corp. | New | 0.24% | +0.24 |
| EVER Everquote Inc. Class A | New | 0.20% | +0.20 |
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 |