Portolan Capital Management, LLC
In its 13F for Q2 2024 (holdings as of June 30, 2024, filed August 14, 2024), Portolan Capital Management, LLC reported 117 stock positions worth $1.2 billion. Its top holding was Lantheus (LNTH) at 4.2% of the portfolio, followed by Celestica (CLS, 3.6%) and Super Micro Computer (SMCI, 2.9%). Compared with Q1 2024, it opened 21 new positions, sold out of 20, added to 36 and reduced 59. The biggest buy was Lantheus (LNTH, shares +20%) and the biggest sale Bio-Rad Laboratories-A (BIO, shares −72%).
- Most Recent 13F
- Q2 2026
- Location
- BOSTON, MA
- CIK
- 0001350290
- Portfolio Value
- $1.2B (Q2 2024)
- SEC Filing
- 0001104659-24-089663 ↗ filed Aug 14, 2024
Holdings Value
Holdings 117 stocks · $1.2B
| LNTH Lantheus Holdings Inc. | 4.18% | 632,105 | $50.8M | Add +20.2% |
| CLS Celestica Inc. | 3.56% | 753,116 | $43.2M | Reduce -24.7% |
| SMCI Super Micro Computer Inc. | 2.86% | 42,439 | $34.8M | Reduce -5.9% |
| ZETA Zeta Global Holdings Corp. Class A | 2.79% | 1,919,190 | $33.9M | Reduce -18.3% |
| KTOS Kratos Defense & Security | 2.69% | 1,630,421 | $32.6M | Add +2.9% |
| ELF Elf Beauty Inc. | 2.42% | 139,649 | $29.4M | Reduce -16.2% |
| MOD Modine Manufacturing Co. | 2.30% | 278,825 | $27.9M | Add +3.7% |
| WDC Western Digital Corp. | 2.22% | 355,997 | $27.0M | Reduce -5.1% |
| NVT Nvent Electric PLC | 2.20% | 348,556 | $26.7M | Add +22.2% |
| CSTL Castle Biosciences Inc. | 2.17% | 1,210,952 | $26.4M | Add +16.1% |
| QTRX Quanterix Corp. | 2.09% | 1,918,030 | $25.3M | Add +65.0% |
| HNST The Honest Co. Inc. | 1.95% | 8,105,357 | $23.7M | Add +8.2% |
| TTMI TTM Technologies | 1.91% | 1,192,680 | $23.2M | Add +130.3% |
| BLFS Biolife Solutions Inc. | 1.77% | 1,004,228 | $21.5M | Add +15.2% |
| ACMR Acm Research Inc. Class A | 1.63% | 855,835 | $19.7M | Add +59.0% |
| NTRA Natera Inc. | 1.49% | 166,577 | $18.0M | Reduce -17.2% |
| UTHR United Therapeutics Corp. | 1.44% | 54,845 | $17.5M | Reduce -50.6% |
| KMPR Kemper Corp. | 1.40% | 286,316 | $17.0M | Add +95.9% |
| MU Micron Technology Inc. | 1.31% | 121,103 | $15.9M | Reduce -24.2% |
| GENI Genius Sports Ltd. | 1.30% | 2,898,346 | $15.8M | Add +31.5% |
| TGLS Tecnoglass Holdings Inc. | 1.21% | 293,587 | $14.7M | Reduce -19.8% |
| AIG American International Group | 1.19% | 195,168 | $14.5M | Add +53.5% |
| IIIV I3 Verticals Inc. Class A | 1.14% | 629,151 | $13.9M | Reduce -32.0% |
| SIMO Silicon Motion Technol-ADR | 1.14% | 170,246 | $13.8M | Add +6.4% |
| FOUR SHIFT4 Payments Inc. Class A | 1.13% | 187,500 | $13.8M | Reduce -21.6% |
| MRVI Maravai Lifesciences Hldgs-A | 1.09% | 1,846,140 | $13.2M | Add +171.3% |
| CDMO Avid Bioservices Inc. | 1.07% | 1,820,779 | $13.0M | Add +110.0% |
| SKX Skechers USA Inc. Class A | 1.04% | 183,190 | $12.7M | Reduce -14.4% |
| SG Sweetgreen Inc. Class A | 1.04% | 419,875 | $12.7M | Reduce -57.9% |
| INDI Indie Semiconductor Inc. Class A | 1.04% | 2,040,951 | $12.6M | Add +10.7% |
| DELL Dell Technologies -C | 1.02% | 89,992 | $12.4M | Add +51.1% |
| CLBT Cellebrite Di Ltd. | 1.00% | 1,020,952 | $12.2M | Reduce -10.7% |
| QNST Quinstreet Inc. | 1.00% | 731,285 | $12.1M | Add +102.8% |
| ORN Orion Group Holdings Inc. | 0.99% | 1,267,822 | $12.1M | New |
| META Meta Platforms Inc. Class A | 0.98% | 23,661 | $11.9M | Reduce -6.9% |
| RDDT Reddit Inc. Class A | 0.98% | 186,046 | $11.9M | New |
| KRUS Kura Sushi USA Inc. Class A | 0.98% | 187,875 | $11.9M | Add +26.3% |
| ARCT Arcturus Therapeutics Holdin | 0.97% | 484,907 | $11.8M | Add +98.2% |
| PHAT Phathom Pharmaceuticals Inc. | 0.96% | 1,130,089 | $11.6M | New |
| CELH Celsius Holdings Inc. | 0.92% | 196,493 | $11.2M | Add +98.0% |
| AVAV Aerovironment Inc. | 0.92% | 61,280 | $11.2M | Add +32.5% |
| AEM Agnico Eagle Mines Ltd. | 0.91% | 169,030 | $11.1M | Reduce -45.8% |
| SMWB Similarweb Ltd. | 0.87% | 1,367,259 | $10.6M | Reduce -33.0% |
| FLEX Flex Ltd. | 0.87% | 356,839 | $10.5M | Reduce -17.1% |
| ORCL Oracle Corp. | 0.84% | 72,110 | $10.2M | Add +37.8% |
| PENG Penguin Solutions Inc. filed as SMART GLOBAL HLDGS INC | 0.83% | 441,815 | $10.1M | Reduce -36.3% |
| NOG Northern Oil and Gas Inc. | 0.82% | 267,170 | $9.9M | Reduce -10.0% |
| IESC Ies Holdings Inc. filed as IES HLDGS INC | 0.80% | 69,455 | $9.7M | New |
| PAYO Payoneer Global Inc. | 0.77% | 1,677,402 | $9.3M | Add +38.4% |
| CROX Crocs Inc. | 0.76% | 63,373 | $9.2M | Reduce -52.4% |
| BASE Couchbase Inc. | 0.74% | 491,944 | $9.0M | Reduce -16.7% |
| VRT Vertiv Holdings Co. Class A | 0.73% | 102,466 | $8.9M | Reduce -21.1% |
| GTES Gates Industrial Corp. UK Ltd. | 0.73% | 558,192 | $8.8M | Add +157.2% |
| AU Anglogold Ashanti PLC | 0.69% | 331,286 | $8.3M | Reduce -38.5% |
| MITK Mitek Systems Inc. | 0.68% | 742,728 | $8.3M | New |
| TECK Teck Resources Ltd.-CLS B | 0.63% | 158,961 | $7.6M | New |
| ENVA Enova International Inc. | 0.63% | 122,081 | $7.6M | Reduce -1.2% |
| RPAY Repay Holdings Corp. | 0.62% | 715,111 | $7.6M | Reduce -12.3% |
| BIDU Baidu Inc. - Spon ADR | 0.60% | 84,847 | $7.3M | Reduce -55.9% |
| STNG Scorpio Tankers Inc. | 0.60% | 90,006 | $7.3M | Reduce -24.4% |
| LUXE Luxexperience BV filed as MYT NETHERLANDS PARENT B V | 0.58% | 1,382,816 | $7.1M | Add +94.2% |
| EGO Eldorado Gold Corp. | 0.57% | 472,142 | $7.0M | Reduce -17.9% |
| AAOI Applied Optoelectronics Inc. | 0.57% | 841,059 | $7.0M | Reduce -41.4% |
| BIO Bio-Rad Laboratories-A | 0.57% | 25,150 | $6.9M | Reduce -72.4% |
| SLM SLM Corp. | 0.55% | 318,697 | $6.6M | Add +688.5% |
| MXCT Maxcyte Inc. | 0.54% | 1,687,650 | $6.6M | Reduce -2.0% |
| MDU Mdu Resources Group Inc. | 0.54% | 262,014 | $6.6M | New |
| INFN Infinera Corp. | 0.54% | 1,077,664 | $6.6M | New |
| BV Brightview Holdings Inc. | 0.53% | 485,165 | $6.5M | Reduce -32.6% |
| TTWO Take-Two Interactive Softwre | 0.53% | 41,384 | $6.4M | Reduce -40.1% |
| STKL Sunopta Inc. | 0.53% | 1,183,964 | $6.4M | Reduce -47.8% |
| PRIM Primoris Services Corp. | 0.52% | 126,542 | $6.3M | New |
| VRN Veren Inc. | 0.51% | 791,988 | $6.2M | Add +1.9% |
| OPRA Opera Ltd.-ADR | 0.50% | 435,464 | $6.1M | New |
| RDNT Radnet Inc. | 0.49% | 101,347 | $6.0M | Add +7.8% |
| PBPB Potbelly Corp. | 0.49% | 741,766 | $6.0M | Reduce -35.3% |
| INSW International Seaways Inc. | 0.45% | 93,191 | $5.5M | Reduce -9.3% |
| AKAM Akamai Technologies Inc. | 0.44% | 59,716 | $5.4M | New |
| HDL Super Hi International Holdi | 0.44% | 296,540 | $5.3M | New |
| KIDS Orthopediatrics Corp. | 0.44% | 185,329 | $5.3M | New |
| CTOS Custom Truck One Source Inc. | 0.42% | 1,186,380 | $5.2M | Reduce -4.7% |
| NMM Navios Maritime Partners LP | 0.42% | 101,090 | $5.2M | Add +2.2% |
| AOSL Alpha & Omega Semiconductor | 0.42% | 137,995 | $5.2M | New |
| NVGS Navigator Holdings Ltd. | 0.41% | 287,156 | $5.0M | Reduce -7.1% |
| WRBY Warby Parker Inc. Class A | 0.40% | 302,898 | $4.9M | Reduce -69.7% |
| EXTR Extreme Networks Inc. | 0.40% | 360,104 | $4.8M | New |
| FORR Forrester Research Inc. | 0.37% | 264,877 | $4.5M | Reduce -33.0% |
| APLD Applied Digital Corp. | 0.37% | 756,556 | $4.5M | Reduce -37.3% |
| TLS Telos Corporation | 0.37% | 1,110,557 | $4.5M | Add +50.6% |
| WKME Walkme Ltd. | 0.36% | 313,839 | $4.4M | Reduce -86.2% |
| INVE Inve Technologies Inc. filed as IDENTIV INC | 0.36% | 1,014,886 | $4.4M | Reduce -29.6% |
| AMPH Amphastar Pharmaceuticals Inc. | 0.36% | 108,863 | $4.4M | Add +19.6% |
| ALT Altimmune Inc. | 0.35% | 640,242 | $4.3M | Reduce -27.8% |
| VKTX Viking Therapeutics Inc. | 0.35% | 79,422 | $4.2M | Reduce -18.6% |
| OTLY Oatly Group AB | 0.34% | 4,384,079 | $4.1M | New |
| LMB Limbach Holdings Inc. | 0.34% | 72,352 | $4.1M | New |
| AMKR Amkor Technology Inc. | 0.32% | 98,394 | $3.9M | New |
| HDSN Hudson Technologies Inc. | 0.32% | 442,896 | $3.9M | Reduce -35.4% |
| PCRX Pacira Biosciences Inc. | 0.31% | 131,901 | $3.8M | New |
| MTRX Matrix Service Co. | 0.31% | 379,070 | $3.8M | Reduce -47.6% |
Portfolio Sells Q1 2024 → Q2 2024
| BIO Bio-Rad Laboratories-A | Reduce -72.4% | 0.57% | −1.83 |
| WKME Walkme Ltd. | Reduce -86.2% | 0.36% | −1.13 |
| RCM R1 RCM Inc. | Sold out | 0.00% | −1.08 |
| AAOI Applied Optoelectronics Inc. | Reduce -41.4% | 0.57% | −0.94 |
| BIDU Baidu Inc. - Spon ADR | Reduce -55.9% | 0.60% | −0.94 |
| SG Sweetgreen Inc. Class A | Reduce -57.9% | 1.04% | −0.88 |
| GDS GDS Holdings Ltd. - ADR | Sold out | 0.00% | −0.84 |
| CROX Crocs Inc. | Reduce -52.4% | 0.76% | −0.70 |
| RPRX Royalty Pharma PLC Class A | Sold out | 0.00% | −0.67 |
| STKL Sunopta Inc. | Reduce -47.8% | 0.53% | −0.66 |
| NRDY Nerdy Inc. | Reduce -98.9% | 0.00% | −0.64 |
| WRBY Warby Parker Inc. Class A | Reduce -69.7% | 0.40% | −0.63 |
| SMCI Super Micro Computer Inc. | Reduce -5.9% | 2.86% | −0.60 |
| PBPB Potbelly Corp. | Reduce -35.3% | 0.49% | −0.57 |
| AXTI Axt Inc. | Sold out | 0.00% | −0.56 |
| PENG Penguin Solutions Inc. | Reduce -36.3% | 0.83% | −0.56 |
| SMWB Similarweb Ltd. | Reduce -33.0% | 0.87% | −0.52 |
| INVE Inve Technologies Inc. | Reduce -29.6% | 0.36% | −0.51 |
| AEM Agnico Eagle Mines Ltd. | Reduce -45.8% | 0.91% | −0.51 |
| UTHR United Therapeutics Corp. | Reduce -50.6% | 1.44% | −0.50 |
| GFL GFL Environmental Inc.-Sub VT | Sold out | 0.00% | −0.50 |
| IIIV I3 Verticals Inc. Class A | Reduce -32.0% | 1.14% | −0.47 |
| BASE Couchbase Inc. | Reduce -16.7% | 0.74% | −0.44 |
| TTGT Techtarget Holdings Inc. | Sold out | 0.00% | −0.41 |
| MTRX Matrix Service Co. | Reduce -47.6% | 0.31% | −0.41 |
| CYRX Cryoport Inc. | Sold out | 0.00% | −0.40 |
| DOCN Digitalocean Holdings Inc. | Sold out | 0.00% | −0.38 |
| OVERSEAS SHIPHOLDING GROUP-A | Sold out | 0.00% | −0.38 |
| NVEI Nuvei Corp.-Subordinate VTG | Sold out | 0.00% | −0.37 |
| UCTT Ultra Clean Holdings Inc. | Sold out | 0.00% | −0.35 |
| ALT Altimmune Inc. | Reduce -27.8% | 0.35% | −0.34 |
| AZZ Azz Inc. | Sold out | 0.00% | −0.30 |
| EVER Everquote Inc. Class A | Reduce -61.8% | 0.24% | −0.28 |
| FORR Forrester Research Inc. | Reduce -33.0% | 0.37% | −0.28 |
| ALRM Alarm.com Holdings Inc. | Sold out | 0.00% | −0.28 |
| SKY Champion Homes Inc. | Reduce -44.9% | 0.25% | −0.27 |
| DOUG Douglas Elliman Inc. | Sold out | 0.00% | −0.27 |
| VKTX Viking Therapeutics Inc. | Reduce -18.6% | 0.35% | −0.26 |
| HDSN Hudson Technologies Inc. | Reduce -35.4% | 0.32% | −0.25 |
| TTWO Take-Two Interactive Softwre | Reduce -40.1% | 0.53% | −0.25 |
| TGLS Tecnoglass Holdings Inc. | Reduce -19.8% | 1.21% | −0.24 |
| AU Anglogold Ashanti PLC | Reduce -38.5% | 0.69% | −0.23 |
| HBIO Harvard Bioscience Inc. | Reduce -98.3% | 0.00% | −0.22 |
| PRCH Porch Group Inc. | Sold out | 0.00% | −0.21 |
| BELFB Bel Fuse Inc. Class B | Reduce -49.6% | 0.29% | −0.20 |
| SMTC Semtech Corp. | Reduce -61.3% | 0.16% | −0.19 |
| LTRX Lantronix Inc. | Sold out | 0.00% | −0.16 |
| CTOS Custom Truck One Source Inc. | Reduce -4.7% | 0.42% | −0.13 |
| MU Micron Technology Inc. | Reduce -24.2% | 1.31% | −0.12 |
| BV Brightview Holdings Inc. | Reduce -32.6% | 0.53% | −0.12 |
Portfolio Buys Q1 2024 → Q2 2024
| LNTH Lantheus Holdings Inc. | Add +20.2% | 4.18% | +1.69 |
| TTMI TTM Technologies | Add +130.3% | 1.91% | +1.29 |
| ORN Orion Group Holdings Inc. | New | 0.99% | +0.99 |
| RDDT Reddit Inc. Class A | New | 0.98% | +0.98 |
| PHAT Phathom Pharmaceuticals Inc. | New | 0.96% | +0.96 |
| IESC Ies Holdings Inc. | New | 0.80% | +0.80 |
| KMPR Kemper Corp. | Add +95.9% | 1.40% | +0.71 |
| MITK Mitek Systems Inc. | New | 0.68% | +0.68 |
| MRVI Maravai Lifesciences Hldgs-A | Add +171.3% | 1.09% | +0.64 |
| CDMO Avid Bioservices Inc. | Add +110.0% | 1.07% | +0.63 |
| TECK Teck Resources Ltd.-CLS B | New | 0.63% | +0.63 |
| NVT Nvent Electric PLC | Add +22.2% | 2.20% | +0.56 |
| MDU Mdu Resources Group Inc. | New | 0.54% | +0.54 |
| BLFS Biolife Solutions Inc. | Add +15.2% | 1.77% | +0.54 |
| INFN Infinera Corp. | New | 0.54% | +0.54 |
| PRIM Primoris Services Corp. | New | 0.52% | +0.52 |
| QNST Quinstreet Inc. | Add +102.8% | 1.00% | +0.51 |
| DELL Dell Technologies -C | Add +51.1% | 1.02% | +0.50 |
| OPRA Opera Ltd.-ADR | New | 0.50% | +0.50 |
| SLM SLM Corp. | Add +688.5% | 0.55% | +0.48 |
| KTOS Kratos Defense & Security | Add +2.9% | 2.69% | +0.47 |
| AKAM Akamai Technologies Inc. | New | 0.44% | +0.44 |
| HDL Super Hi International Holdi | New | 0.44% | +0.44 |
| KIDS Orthopediatrics Corp. | New | 0.44% | +0.44 |
| AIG American International Group | Add +53.5% | 1.19% | +0.44 |
| GTES Gates Industrial Corp. UK Ltd. | Add +157.2% | 0.73% | +0.43 |
| ACMR Acm Research Inc. Class A | Add +59.0% | 1.63% | +0.43 |
| AOSL Alpha & Omega Semiconductor | New | 0.42% | +0.42 |
| CSTL Castle Biosciences Inc. | Add +16.1% | 2.17% | +0.41 |
| LUXE Luxexperience BV | Add +94.2% | 0.58% | +0.41 |
| EXTR Extreme Networks Inc. | New | 0.40% | +0.40 |
| AVAV Aerovironment Inc. | Add +32.5% | 0.92% | +0.38 |
| MOD Modine Manufacturing Co. | Add +3.7% | 2.30% | +0.35 |
| ARCT Arcturus Therapeutics Holdin | Add +98.2% | 0.97% | +0.34 |
| GENI Genius Sports Ltd. | Add +31.5% | 1.30% | +0.34 |
| OTLY Oatly Group AB | New | 0.34% | +0.34 |
| LMB Limbach Holdings Inc. | New | 0.34% | +0.34 |
| ORCL Oracle Corp. | Add +37.8% | 0.84% | +0.34 |
| AMKR Amkor Technology Inc. | New | 0.32% | +0.32 |
| PAYO Payoneer Global Inc. | Add +38.4% | 0.77% | +0.32 |
| PCRX Pacira Biosciences Inc. | New | 0.31% | +0.31 |
| CELH Celsius Holdings Inc. | Add +98.0% | 0.92% | +0.30 |
| SIMO Silicon Motion Technol-ADR | Add +6.4% | 1.14% | +0.20 |
| MAMA Mama's Creations Inc. | New | 0.19% | +0.19 |
| WEX Wex Inc. | New | 0.19% | +0.19 |
| RDNT Radnet Inc. | Add +7.8% | 0.49% | +0.14 |
| TLS Telos Corporation | Add +50.6% | 0.37% | +0.13 |
| NMM Navios Maritime Partners LP | Add +2.2% | 0.42% | +0.10 |
| AMPH Amphastar Pharmaceuticals Inc. | Add +19.6% | 0.36% | +0.05 |
| INDI Indie Semiconductor Inc. Class A | Add +10.7% | 1.04% | +0.04 |
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 |