Portolan Capital Management, LLC

In its 13F for Q3 2024 (holdings as of September 30, 2024, filed November 14, 2024), Portolan Capital Management, LLC reported 129 stock positions worth $1.4 billion. Its top holding was Lantheus (LNTH) at 5.3% of the portfolio, followed by Zeta Global Class A (ZETA, 3.0%) and Kratos Defense & Security (KTOS, 3.0%). Compared with Q2 2024, it opened 36 new positions, sold out of 24, added to 48 and reduced 45. The biggest buy was a new position in Talen Energy (TLN) and the biggest sale Super Micro Computer (SMCI, shares −60%).

Most Recent 13F
Q2 2026
Location
BOSTON, MA
CIK
0001350290
Portfolio Value
$1.4B (Q3 2024)
SEC Filing
0001104659-24-118686 ↗ filed Nov 14, 2024

Holdings Value

0$1.0B$2.0B$3.0B Q1 2024: $1.3B Q1 2024 Q2 2024: $1.2B Q2 2024 Q3 2024: $1.4B $1.4B Q3 2024 Q4 2024: $1.5B Q4 2024 Q1 2025: $1.3B Q1 2025 Q2 2025: $1.6B Q2 2025 Q3 2025: $1.8B Q3 2025 Q4 2025: $1.9B Q4 2025 Q1 2026: $1.9B Q1 2026 Q2 2026: $2.7B Q2 2026

Holdings 129 stocks · $1.4B
LNTH Lantheus Holdings Inc. 5.34% 670,881 $73.6M Add +6.1%
ZETA Zeta Global Holdings Corp. Class A 3.04% 1,405,132 $41.9M Reduce -26.8%
KTOS Kratos Defense & Security 3.00% 1,776,740 $41.4M Add +9.0%
TLN Talen Energy Corp. 2.86% 221,145 $39.4M New
CLS Celestica Inc. 2.71% 730,946 $37.4M Reduce -2.9%
CSTL Castle Biosciences Inc. 2.60% 1,255,628 $35.8M Add +3.7%
RDNT Radnet Inc. 2.47% 491,358 $34.1M Add +384.8%
QTRX Quanterix Corp. 2.37% 2,520,686 $32.7M Add +31.4%
PHAT Phathom Pharmaceuticals Inc. 2.23% 1,699,918 $30.7M Add +50.4%
MOD Modine Manufacturing Co. 2.01% 208,766 $27.7M Reduce -25.1%
HNST The Honest Co. Inc. 1.98% 7,668,350 $27.4M Reduce -5.4%
GDS GDS Holdings Ltd. - ADR filed as GDS HLDGS LTD 1.93% 1,302,533 $26.6M New
GENI Genius Sports Ltd. 1.80% 3,170,891 $24.9M Add +9.4%
CDMO Avid Bioservices Inc. 1.73% 2,093,991 $23.8M Add +15.0%
CLBT Cellebrite Di Ltd. 1.49% 1,224,020 $20.6M Add +19.9%
TGLS Tecnoglass Holdings Inc. 1.45% 290,880 $20.0M Reduce -0.9%
SG Sweetgreen Inc. Class A 1.43% 555,569 $19.7M Add +32.3%
TTMI TTM Technologies 1.40% 1,061,370 $19.4M Reduce -11.0%
KMPR Kemper Corp. 1.39% 313,300 $19.2M Add +9.4%
ACMR Acm Research Inc. Class A 1.36% 921,451 $18.7M Add +7.7%
KRUS Kura Sushi USA Inc. Class A 1.26% 216,530 $17.4M Add +15.3%
EXTR Extreme Networks Inc. 1.16% 1,060,828 $15.9M Add +194.6%
AMPH Amphastar Pharmaceuticals Inc. 1.15% 327,764 $15.9M Add +201.1%
ALGN Align Technology Inc. 1.11% 60,386 $15.4M New
QNST Quinstreet Inc. 1.11% 801,693 $15.3M Add +9.6%
MRVI Maravai Lifesciences Hldgs-A 1.08% 1,792,529 $14.9M Reduce -2.9%
FLEX Flex Ltd. 1.07% 440,856 $14.7M Add +23.5%
BASE Couchbase Inc. 1.02% 874,795 $14.1M Add +77.8%
COMP Compass Inc. Class A 1.01% 2,287,336 $14.0M New
IIIV I3 Verticals Inc. Class A 1.01% 653,072 $13.9M Add +3.8%
BIDU Baidu Inc. - Spon ADR 1.01% 132,066 $13.9M Add +55.6%
VRT Vertiv Holdings Co. Class A 1.00% 138,877 $13.8M Add +35.5%
CROX Crocs Inc. 0.96% 91,776 $13.3M Add +44.8%
ELF Elf Beauty Inc. 0.94% 119,289 $13.0M Reduce -14.6%
GEHC GE Healthcare Technology 0.93% 136,625 $12.8M New
MDU Mdu Resources Group Inc. 0.88% 445,288 $12.2M Add +70.0%
SRAD Sportradar Group AG-A 0.87% 995,953 $12.1M New
FOUR SHIFT4 Payments Inc. Class A 0.86% 134,612 $11.9M Reduce -28.2%
VIRT Virtu Financial Inc. Class A 0.86% 391,272 $11.9M New
ORN Orion Group Holdings Inc. 0.83% 1,985,355 $11.5M Add +56.6%
HZO Marinemax Inc. 0.82% 319,576 $11.3M New
OPRA Opera Ltd.-ADR 0.80% 711,820 $11.0M Add +63.5%
UTHR United Therapeutics Corp. 0.79% 30,506 $10.9M Reduce -44.4%
NOG Northern Oil and Gas Inc. 0.79% 307,240 $10.9M Add +15.0%
BLFS Biolife Solutions Inc. 0.78% 427,876 $10.7M Reduce -57.4%
NTRA Natera Inc. 0.77% 83,680 $10.6M Reduce -49.8%
SKX Skechers USA Inc. Class A 0.75% 154,059 $10.3M Reduce -15.9%
ENVA Enova International Inc. 0.72% 118,056 $9.9M Reduce -3.3%
BV Brightview Holdings Inc. 0.71% 620,515 $9.8M Add +27.9%
NVT Nvent Electric PLC 0.70% 138,307 $9.7M Reduce -60.3%
BELFB Bel Fuse Inc. Class B 0.69% 120,858 $9.5M Add +122.8%
PRIM Primoris Services Corp. 0.69% 163,090 $9.5M Add +28.9%
AAOI Applied Optoelectronics Inc. 0.68% 658,592 $9.4M Reduce -21.7%
LMB Limbach Holdings Inc. 0.68% 123,354 $9.3M Add +70.5%
WDC Western Digital Corp. 0.67% 135,227 $9.2M Reduce -62.0%
META Meta Platforms Inc. Class A 0.66% 15,980 $9.1M Reduce -32.5%
SLM SLM Corp. 0.65% 394,437 $9.0M Add +23.8%
KIDS Orthopediatrics Corp. 0.61% 308,099 $8.4M Add +66.2%
LUCK Lucky Strike Entertainment C filed as BOWLERO CORP 0.60% 705,357 $8.3M New
PAYO Payoneer Global Inc. 0.58% 1,067,216 $8.0M Reduce -36.4%
STKL Sunopta Inc. 0.58% 1,255,931 $8.0M Add +6.1%
VKTX Viking Therapeutics Inc. 0.58% 125,762 $8.0M Add +58.4%
IESC Ies Holdings Inc. filed as IES HLDGS INC 0.57% 39,391 $7.9M Reduce -43.3%
PBPB Potbelly Corp. 0.55% 902,529 $7.5M Add +21.7%
BIO Bio-Rad Laboratories-A 0.53% 21,900 $7.3M Reduce -12.9%
SMCI Super Micro Computer Inc. 0.52% 17,133 $7.1M Reduce -59.6%
GNRC Generac Holdings Inc. 0.51% 44,225 $7.0M New
MAMA Mama's Creations Inc. 0.50% 953,629 $7.0M Add +177.2%
LUXE Luxexperience BV filed as MYT NETHERLANDS PARENT B V 0.50% 1,805,758 $6.9M Add +30.6%
MGPI MGP Ingredients Inc. 0.49% 81,400 $6.8M New
ORCL Oracle Corp. 0.48% 39,022 $6.6M Reduce -45.9%
MTCH Match Group Inc. 0.48% 173,414 $6.6M New
CORZ Core Scientific Inc. 0.47% 551,977 $6.5M New
TTWO Take-Two Interactive Softwre 0.47% 42,564 $6.5M Add +2.9%
MTRX Matrix Service Co. 0.43% 509,059 $5.9M Add +34.3%
WEX Wex Inc. 0.41% 26,870 $5.6M Add +108.9%
APLD Applied Digital Corp. 0.40% 672,254 $5.5M Reduce -11.1%
HCAT Health Catalyst Inc. 0.39% 663,602 $5.4M New
INDI Indie Semiconductor Inc. Class A 0.39% 1,344,430 $5.4M Reduce -34.1%
DOUG Douglas Elliman Inc. 0.39% 2,910,906 $5.3M New
RH RH 0.38% 15,480 $5.2M New
MXCT Maxcyte Inc. 0.37% 1,303,438 $5.1M Reduce -22.8%
TXNM TXNM Energy Inc. 0.37% 115,360 $5.0M New
EBAY eBay Inc. 0.36% 76,760 $5.0M New
NMM Navios Maritime Partners LP 0.36% 79,221 $5.0M Reduce -21.6%
MYGN Myriad Genetics Inc. 0.36% 179,634 $4.9M New
NVGS Navigator Holdings Ltd. 0.35% 300,408 $4.8M Add +4.6%
RPRX Royalty Pharma PLC Class A 0.35% 170,464 $4.8M New
RELY Remitly Global Inc. 0.34% 353,054 $4.7M Add +96.3%
OI O-I Glass Inc. 0.34% 353,166 $4.6M New
MU Micron Technology Inc. 0.33% 43,990 $4.6M Reduce -63.7%
INSW International Seaways Inc. 0.32% 84,625 $4.4M Reduce -9.2%
SMTC Semtech Corp. 0.31% 94,036 $4.3M Add +46.5%
CACI Caci International Inc. Class A 0.31% 8,476 $4.3M New
OTLY Oatly Group AB 0.29% 4,745,911 $4.1M Add +8.3%
USAP Universal Stainless & Alloy 0.29% 104,916 $4.1M New
PSN Parsons Corp. 0.28% 37,597 $3.9M New
CALY Callaway Golf Company filed as TOPGOLF CALLAWAY BRANDS CORP 0.28% 351,691 $3.9M New
WRBY Warby Parker Inc. Class A 0.28% 233,401 $3.8M Reduce -22.9%
FORR Forrester Research Inc. 0.27% 206,599 $3.7M Reduce -22.0%
INVE Inve Technologies Inc. filed as IDENTIV INC 0.26% 1,008,220 $3.6M Reduce -0.7%
DBRG Digitalbridge Group Inc. 0.24% 234,238 $3.3M New
SONO Sonos Inc. 0.24% 264,831 $3.3M New
SKY Champion Homes Inc. 0.23% 34,009 $3.2M Reduce -23.4%
CRMT America's Car-Mart Inc. 0.23% 76,264 $3.2M New
DKNG Draftkings Inc. Class A 0.23% 81,364 $3.2M New
MITK Mitek Systems Inc. 0.23% 366,749 $3.2M Reduce -50.6%
GENK Gen Restaurant Group Inc. 0.23% 372,759 $3.1M Add +1.8%
DIBS 1STDIBS.COM Inc. 0.23% 707,652 $3.1M Add +7.1%
ARCT Arcturus Therapeutics Holdin 0.22% 129,144 $3.0M Reduce -73.4%
RDDT Reddit Inc. Class A 0.21% 44,542 $2.9M Reduce -76.1%
HDSN Hudson Technologies Inc. 0.20% 335,840 $2.8M Reduce -24.2%
JAKK Jakks Pacific Inc. 0.20% 109,203 $2.8M New
BWXT BWX Technologies Inc. 0.19% 24,632 $2.7M New
MIR Mirion Technologies Inc. 0.19% 236,975 $2.6M New
SPWH Sportsman's Warehouse Holdin 0.19% 946,313 $2.6M New
ESTA Establishment Labs Holdings 0.18% 56,533 $2.4M New
LIND Lindblad Expeditions Holding 0.17% 259,343 $2.4M New
MSFT Microsoft Corp. 0.17% 5,538 $2.4M Add +4.5%
DELL Dell Technologies -C 0.16% 18,815 $2.2M Reduce -79.1%
CTOS Custom Truck One Source Inc. 0.14% 574,300 $2.0M Reduce -51.6%
PENG Penguin Solutions Inc. filed as SMART GLOBAL HLDGS INC 0.14% 89,325 $1.9M Reduce -79.8%
HDL Super Hi International Holdi 0.13% 100,358 $1.7M Reduce -66.2%
CWST Casella Waste Systems Inc. Class A 0.11% 15,392 $1.5M Reduce -1.9%
GOOG Alphabet Inc. Class C 0.08% 6,754 $1.1M Add +9.4%
AU Anglogold Ashanti PLC 0.07% 35,554 $947K Reduce -89.3%
PRCH Porch Group Inc. 0.04% 399,219 $613K New
BXC Bluelinx Holdings Inc. 0.03% 4,055 $427K Reduce -4.1%
ALT Altimmune Inc. 0.03% 60,976 $374K Reduce -90.5%

Portfolio Sells Q2 2024 → Q3 2024
SMCI Super Micro Computer Inc. Reduce -59.6% 0.52% −2.35
WDC Western Digital Corp. Reduce -62.0% 0.67% −1.55
NVT Nvent Electric PLC Reduce -60.3% 0.70% −1.49
ELF Elf Beauty Inc. Reduce -14.6% 0.94% −1.48
AIG American International Group Sold out 0.00% −1.19
SIMO Silicon Motion Technol-ADR Sold out 0.00% −1.14
BLFS Biolife Solutions Inc. Reduce -57.4% 0.78% −1.00
MU Micron Technology Inc. Reduce -63.7% 0.33% −0.98
CELH Celsius Holdings Inc. Sold out 0.00% −0.92
AVAV Aerovironment Inc. Sold out 0.00% −0.92
AEM Agnico Eagle Mines Ltd. Sold out 0.00% −0.91
SMWB Similarweb Ltd. Sold out 0.00% −0.87
DELL Dell Technologies -C Reduce -79.1% 0.16% −0.86
CLS Celestica Inc. Reduce -2.9% 2.71% −0.85
RDDT Reddit Inc. Class A Reduce -76.1% 0.21% −0.77
ARCT Arcturus Therapeutics Holdin Reduce -73.4% 0.22% −0.76
GTES Gates Industrial Corp. UK Ltd. Sold out 0.00% −0.73
NTRA Natera Inc. Reduce -49.8% 0.77% −0.72
PENG Penguin Solutions Inc. Reduce -79.8% 0.14% −0.70
INDI Indie Semiconductor Inc. Class A Reduce -34.1% 0.39% −0.65
UTHR United Therapeutics Corp. Reduce -44.4% 0.79% −0.65
TECK Teck Resources Ltd.-CLS B Sold out 0.00% −0.63
RPAY Repay Holdings Corp. Sold out 0.00% −0.62
AU Anglogold Ashanti PLC Reduce -89.3% 0.07% −0.62
STNG Scorpio Tankers Inc. Sold out 0.00% −0.60
EGO Eldorado Gold Corp. Sold out 0.00% −0.57
INFN Infinera Corp. Sold out 0.00% −0.54
VRN Veren Inc. Sold out 0.00% −0.51
TTMI TTM Technologies Reduce -11.0% 1.40% −0.50
MITK Mitek Systems Inc. Reduce -50.6% 0.23% −0.45
AKAM Akamai Technologies Inc. Sold out 0.00% −0.44
AOSL Alpha & Omega Semiconductor Sold out 0.00% −0.42
TLS Telos Corporation Sold out 0.00% −0.37
WKME Walkme Ltd. Sold out 0.00% −0.36
ORCL Oracle Corp. Reduce -45.9% 0.48% −0.36
AMKR Amkor Technology Inc. Sold out 0.00% −0.32
ALT Altimmune Inc. Reduce -90.5% 0.03% −0.32
META Meta Platforms Inc. Class A Reduce -32.5% 0.66% −0.32
HDL Super Hi International Holdi Reduce -66.2% 0.13% −0.31
PCRX Pacira Biosciences Inc. Sold out 0.00% −0.31
SKX Skechers USA Inc. Class A Reduce -15.9% 0.75% −0.30
MOD Modine Manufacturing Co. Reduce -25.1% 2.01% −0.29
CTOS Custom Truck One Source Inc. Reduce -51.6% 0.14% −0.28
FOUR SHIFT4 Payments Inc. Class A Reduce -28.2% 0.86% −0.27
EVER Everquote Inc. Class A Sold out 0.00% −0.24
IESC Ies Holdings Inc. Reduce -43.3% 0.57% −0.23
OPK Opko Health Inc. Sold out 0.00% −0.19
PAYO Payoneer Global Inc. Reduce -36.4% 0.58% −0.18
MXCT Maxcyte Inc. Reduce -22.8% 0.37% −0.18
INSW International Seaways Inc. Reduce -9.2% 0.32% −0.14

Portfolio Buys Q2 2024 → Q3 2024
TLN Talen Energy Corp. New 2.86% +2.86
RDNT Radnet Inc. Add +384.8% 2.47% +1.98
GDS GDS Holdings Ltd. - ADR New 1.93% +1.93
PHAT Phathom Pharmaceuticals Inc. Add +50.4% 2.23% +1.27
LNTH Lantheus Holdings Inc. Add +6.1% 5.34% +1.16
ALGN Align Technology Inc. New 1.11% +1.11
COMP Compass Inc. Class A New 1.01% +1.01
GEHC GE Healthcare Technology New 0.93% +0.93
SRAD Sportradar Group AG-A New 0.87% +0.87
VIRT Virtu Financial Inc. Class A New 0.86% +0.86
HZO Marinemax Inc. New 0.82% +0.82
AMPH Amphastar Pharmaceuticals Inc. Add +201.1% 1.15% +0.79
EXTR Extreme Networks Inc. Add +194.6% 1.16% +0.76
CDMO Avid Bioservices Inc. Add +15.0% 1.73% +0.66
LUCK Lucky Strike Entertainment C New 0.60% +0.60
GNRC Generac Holdings Inc. New 0.51% +0.51
GENI Genius Sports Ltd. Add +9.4% 1.80% +0.50
MGPI MGP Ingredients Inc. New 0.49% +0.49
CLBT Cellebrite Di Ltd. Add +19.9% 1.49% +0.49
MTCH Match Group Inc. New 0.48% +0.48
CORZ Core Scientific Inc. New 0.47% +0.47
CSTL Castle Biosciences Inc. Add +3.7% 2.60% +0.43
BIDU Baidu Inc. - Spon ADR Add +55.6% 1.01% +0.40
BELFB Bel Fuse Inc. Class B Add +122.8% 0.69% +0.40
HCAT Health Catalyst Inc. New 0.39% +0.39
DOUG Douglas Elliman Inc. New 0.39% +0.39
SG Sweetgreen Inc. Class A Add +32.3% 1.43% +0.39
RH RH New 0.38% +0.38
TXNM TXNM Energy Inc. New 0.37% +0.37
EBAY eBay Inc. New 0.36% +0.36
MYGN Myriad Genetics Inc. New 0.36% +0.36
RPRX Royalty Pharma PLC Class A New 0.35% +0.35
MDU Mdu Resources Group Inc. Add +70.0% 0.88% +0.34
LMB Limbach Holdings Inc. Add +70.5% 0.68% +0.34
OI O-I Glass Inc. New 0.34% +0.34
KTOS Kratos Defense & Security Add +9.0% 3.00% +0.31
MAMA Mama's Creations Inc. Add +177.2% 0.50% +0.31
CACI Caci International Inc. Class A New 0.31% +0.31
OPRA Opera Ltd.-ADR Add +63.5% 0.80% +0.29
USAP Universal Stainless & Alloy New 0.29% +0.29
KRUS Kura Sushi USA Inc. Class A Add +15.3% 1.26% +0.29
BASE Couchbase Inc. Add +77.8% 1.02% +0.28
PSN Parsons Corp. New 0.28% +0.28
QTRX Quanterix Corp. Add +31.4% 2.37% +0.28
CALY Callaway Golf Company New 0.28% +0.28
VRT Vertiv Holdings Co. Class A Add +35.5% 1.00% +0.27
DBRG Digitalbridge Group Inc. New 0.24% +0.24
SONO Sonos Inc. New 0.24% +0.24
CRMT America's Car-Mart Inc. New 0.23% +0.23
DKNG Draftkings Inc. Class A New 0.23% +0.23

All Filings

QuarterPositions13F Reported ValueTop Holdings
Q2 2026 148$2.7BVPG, VIRT, TTMI, MOD, QLYS
Q1 2026 144$1.9BMOD, TTMI, CLS, VIRT, AKAM
Q4 2025 155$1.9BTTMI, MOD, CSTL, CLS, AKAM
Q3 2025 119$1.8BMOD, TTMI, ELF, DBRG, CLS
Q2 2025 118$1.6BCLS, KTOS, ELF, AVAV, MOD
Q1 2025 109$1.3BLNTH, SLM, KTOS, GENI, MOD
Q4 2024 131$1.5BLNTH, CLS, SMTC, MOD, HNST
Q3 2024 129$1.4BLNTH, ZETA, KTOS, TLN, CLS
Q2 2024 117$1.2BLNTH, CLS, SMCI, ZETA, KTOS
Q1 2024 116$1.3BSMCI, CLS, LNTH, ELF, BIO