0001104659-26-062488.txt : 20260515 0001104659-26-062488.hdr.sgml : 20260515 20260515160414 ACCESSION NUMBER: 0001104659-26-062488 CONFORMED SUBMISSION TYPE: 13F-HR PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20260331 FILED AS OF DATE: 20260515 DATE AS OF CHANGE: 20260515 EFFECTIVENESS DATE: 20260515 FILER: COMPANY DATA: COMPANY CONFORMED NAME: Portolan Capital Management, LLC CENTRAL INDEX KEY: 0001350290 ORGANIZATION NAME: EIN: 201926326 STATE OF INCORPORATION: DE FISCAL YEAR END: 1231 FILING VALUES: FORM TYPE: 13F-HR SEC ACT: 1934 Act SEC FILE NUMBER: 028-11602 FILM NUMBER: 26986885 BUSINESS ADDRESS: STREET 1: 2 INTERNATIONAL PLACE, 26TH FLOOR CITY: BOSTON STATE: MA ZIP: 02110 BUSINESS PHONE: 617.753.6400 MAIL ADDRESS: STREET 1: 2 INTERNATIONAL PLACE, 26TH FLOOR CITY: BOSTON STATE: MA ZIP: 02110 13F-HR 1 primary_doc.xml X0202 13F-HR LIVE false false false 0001350290 XXXXXXXX 03-31-2026 03-31-2026 false Portolan Capital Management, LLC

2 INTERNATIONAL PLACE, 26TH FLOOR BOSTON MA 02110

13F HOLDINGS REPORT 028-11602 N Betsy Flaherty 617-753-6400 /s/Betsy Flaherty Boston MA 05-15-2026 0 144 1878962983 INFORMATION TABLE 2 infotable.xml ACM RESH INC COM CL A 00108J109 3276124 83256 SH SOLE 83256 0 0 ADEIA INC COM 00676P107 17528948 729461 SH SOLE 729461 0 0 AEROVIRONMENT INC COM 008073108 4920384 26880 SH SOLE 26880 0 0 AKAMAI TECHNOLOGIES INC COM 00971T101 48632314 423442 SH SOLE 423442 0 0 ALLIENT INC COM 019330109 19112838 323453 SH SOLE 323453 0 0 ALPHABET INC CAP STK CL C 02079K107 1637971 5710 SH SOLE 5710 0 0 AMBARELLA INC SHS G037AX101 5597855 108749 SH SOLE 108749 0 0 AMER SPORTS INC COM SHS G0260P102 11779632 357826 SH SOLE 357826 0 0 AMERICAN SUPERCONDUCTOR CORP SHS NEW 030111207 10007279 295636 SH SOLE 295636 0 0 AMPLIFY ENERGY CORP NEW COM 03212B103 462509 74120 SH SOLE 74120 0 0 AMPLITUDE INC COM CL A 03213A104 2452424 359593 SH SOLE 359593 0 0 APPLIED OPTOELECTRONICS INC COM 03823U102 2523573 29833 SH SOLE 29833 0 0 AXCELIS TECHNOLOGIES INC COM NEW 054540208 7182797 77168 SH SOLE 77168 0 0 BAIDU INC SPON ADR REP A 056752108 40827519 366429 SH SOLE 366429 0 0 BEL FUSE INC CL B 077347300 10526597 53170 SH SOLE 53170 0 0 BIO RAD LABS INC CL A 090572207 3950724 14173 SH SOLE 14173 0 0 BIOGEN INC COM 09062X103 21721122 118481 SH SOLE 118481 0 0 BLACKLINE INC COM 09239B109 5883962 159026 SH SOLE 159026 0 0 CANADA GOOSE HLDGS INC SHS SUB VTG 135086106 35304499 3218277 SH SOLE 3218277 0 0 CANDEL THERAPEUTICS INC COM 137404109 14182193 2894325 SH SOLE 2894325 0 0 CAREDX INC COM 14167L103 5908511 340352 SH SOLE 340352 0 0 CASELLA WASTE SYS INC CL A 147448104 1198034 15100 SH SOLE 15100 0 0 CASTLE BIOSCIENCES INC COM 14843C105 33149448 1350283 SH SOLE 1350283 0 0 CELESTICA INC COM 15101Q207 55734050 197863 SH SOLE 197863 0 0 CELLEBRITE DI LTD ORDINARY SHARES M2197Q107 30053133 2180924 SH SOLE 2180924 0 0 CELSIUS HLDGS INC COM NEW 15118V207 5839902 164597 SH SOLE 164597 0 0 CENTURY ALUM CO COM 156431108 5577839 95039 SH SOLE 95039 0 0 CIENA CORP COM NEW 171779309 7169055 18466 SH SOLE 18466 0 0 CIRCLE INTERNET GROUP INC COM CL A 172573107 20398276 213796 SH SOLE 213796 0 0 CORE NATURAL RESOURCES INC COM SHS 218937100 24824780 237036 SH SOLE 237036 0 0 CRESCENT ENERGY COMPANY CL A COM 44952J104 35115417 2601142 SH SOLE 2601142 0 0 DANA INC COM 235825205 1152075 34237 SH SOLE 34237 0 0 DAVE INC CLASS A COM NEW 23834J201 18356398 105442 SH SOLE 105442 0 0 DHT HOLDINGS INC SHS NEW Y2065G121 19946967 1091788 SH SOLE 1091788 0 0 DIGI INTL INC COM 253798102 8206339 170256 SH SOLE 170256 0 0 DIGITALBRIDGE GROUP INC CL A NEW 25401T603 5753665 373130 SH SOLE 373130 0 0 DOMO INC COM CL B 257554105 603138 197104 SH SOLE 197104 0 0 DOUGLAS ELLIMAN INC COM 25961D105 4377209 2669030 SH SOLE 2669030 0 0 DRAGANFLY INC. COM 26142Q304 3352204 682730 SH SOLE 682730 0 0 E L F BEAUTY INC COM 26856L103 8285811 136707 SH SOLE 136707 0 0 EBAY INC. COM 278642103 11477258 126096 SH SOLE 126096 0 0 ELEMENT SOLUTIONS INC COM 28618M106 7552860 221232 SH SOLE 221232 0 0 ENOVA INTL INC COM 29357K103 10991771 80923 SH SOLE 80923 0 0 ERMENEGILDO ZEGNA N V ORD SHS N30577105 7404723 710626 SH SOLE 710626 0 0 ESTABLISHMENT LABS HLDGS INC COM G31249108 543555 9573 SH SOLE 9573 0 0 EVERUS CONSTR GROUP COM 300426103 1030074 8725 SH SOLE 8725 0 0 EVOLV TECHNOLOGIES HLDNGS IN COM CL A 30049H102 10863912 1795688 SH SOLE 1795688 0 0 EXZEO GROUP INC COM SHS 30234F101 3079013 209885 SH SOLE 209885 0 0 FABRINET SHS G3323L100 28560000 54763 SH SOLE 54763 0 0 FLEXTRONICS INTL LTD ORD Y2573F102 29007159 443128 SH SOLE 443128 0 0 FORGENT POWER SOLUTIONS INC COM SHS CL A 34631F102 3451899 117933 SH SOLE 117933 0 0 FORRESTER RESH INC COM 346563109 8723622 1541276 SH SOLE 1541276 0 0 FREQUENCY ELECTRS INC COM 358010106 6645241 150141 SH SOLE 150141 0 0 FULGENT GENETICS INC COM 359664109 1695608 106642 SH SOLE 106642 0 0 GDS HLDGS LTD SPONSORED ADS 36165L108 615671 15281 SH SOLE 15281 0 0 GENEDX HOLDINGS CORP COM CL A 81663L200 6587367 102575 SH SOLE 102575 0 0 GENIUS SPORTS LIMITED SHARES CL A G3934V109 12364210 2791018 SH SOLE 2791018 0 0 GIGACLOUD TECHNOLOGY INC CLASS A ORD G38644103 2360395 52014 SH SOLE 52014 0 0 GRAHAM CORP COM 384556106 8172640 103556 SH SOLE 103556 0 0 GREEN DOT CORP CL A 39304D102 3351380 298697 SH SOLE 298697 0 0 GUARDANT HEALTH INC COM 40131M109 1307497 14155 SH SOLE 14155 0 0 HAFNIA LTD SHS Y2990R101 14810249 1948717 SH SOLE 1948717 0 0 HEALTHEQUITY INC COM 42226A107 8494556 101646 SH SOLE 101646 0 0 HONEST CO INC COM 438333106 8954752 3045834 SH SOLE 3045834 0 0 I3 VERTICALS INC COM CL A 46571Y107 4634647 207274 SH SOLE 207274 0 0 IES HOLDINGS INC COM 44951W106 5655222 11869 SH SOLE 11869 0 0 JABIL INC COM 466313103 20505839 77197 SH SOLE 77197 0 0 KOSMOS ENERGY LTD COM 500688106 1675067 602542 SH SOLE 602542 0 0 KRATOS DEFENSE & SEC SOLUTIO COM NEW 50077B207 18319274 259811 SH SOLE 259811 0 0 KURA SUSHI USA INC CL A COM 501270102 21021585 301212 SH SOLE 301212 0 0 L3HARRIS TECHNOLOGIES INC COM 502431109 744489 2157 SH SOLE 2157 0 0 LANTHEUS HLDGS INC COM 516544103 31659032 417390 SH SOLE 417390 0 0 LIGHTPATH TECHNOLOGIES INC COM CL A 532257805 10435834 1040462 SH SOLE 1040462 0 0 LINCOLN EDL SVCS CORP COM 533535100 569805 14007 SH SOLE 14007 0 0 LUMENTUM HLDGS INC COM 55024U109 4091469 5822 SH SOLE 5822 0 0 LUXEXPERIENCE BV SPONSORED ADS 55406W103 29871544 3733943 SH SOLE 3733943 0 0 MAMAS CREATIONS INC COM 56146T103 18054198 1176936 SH SOLE 1176936 0 0 MAYVILLE ENGR CO INC COM 578605107 14739391 821136 SH SOLE 821136 0 0 META PLATFORMS INC CL A 30303M102 5870626 10261 SH SOLE 10261 0 0 MIAMI INTL HLDGS INC COM 59356Q108 5013635 128819 SH SOLE 128819 0 0 MOBILEYE GLOBAL INC COMMON CLASS A 60741F104 4658787 678135 SH SOLE 678135 0 0 MODINE MFG CO COM 607828100 89304457 412092 SH SOLE 412092 0 0 MOOG INC CL A 615394202 8614444 29437 SH SOLE 29437 0 0 MURPHY USA INC COM 626755102 23763415 48107 SH SOLE 48107 0 0 NATERA INC COM 632307104 2283486 11418 SH SOLE 11418 0 0 NEXTPOWER INC CLASS A COM 65290E101 6840851 56747 SH SOLE 56747 0 0 NLIGHT INC COM 65487K100 12862344 225576 SH SOLE 225576 0 0 NOKIA CORP SPONSORED ADR 654902204 19247519 2393970 SH SOLE 2393970 0 0 NORTHERN OIL & GAS INC COM 665531307 5970052 204244 SH SOLE 204244 0 0 NOVANTA INC COM 67000B104 4429952 37507 SH SOLE 37507 0 0 OKEANIS ECO TANKERS COR SHS Y64177101 27260927 538860 SH SOLE 538860 0 0 ON HLDG AG NAMEN AKT A H5919C104 6887145 202444 SH SOLE 202444 0 0 ONTO INNOVATION INC COM 683344105 4565473 22263 SH SOLE 22263 0 0 OPEN LENDING CORP COM 68373J104 8628610 6902888 SH SOLE 6902888 0 0 OSHKOSH CORP COM 688239201 2677014 18185 SH SOLE 18185 0 0 PAR PAC HOLDINGS INC COM NEW 69888T207 43461762 693834 SH SOLE 693834 0 0 PARK AEROSPACE CORP COM 70014A104 11243734 410655 SH SOLE 410655 0 0 PBF ENERGY INC CL A 69318G106 38095905 799998 SH SOLE 799998 0 0 PERSONALIS INC COM 71535D106 4692862 736713 SH SOLE 736713 0 0 PLANET LABS PBC COM CL A 72703X106 1321700 47288 SH SOLE 47288 0 0 PORCH GROUP INC COM 733245104 15378861 2144890 SH SOLE 2144890 0 0 POWELL INDS INC COM 739128106 41030096 75830 SH SOLE 75830 0 0 PRIMORIS SVCS CORP COM 74164F103 18684743 130626 SH SOLE 130626 0 0 PROCEPT BIOROBOTICS CORP COM 74276L105 6295417 251716 SH SOLE 251716 0 0 PROPETRO HLDG CORP COM 74347M108 4536484 314815 SH SOLE 314815 0 0 PULSE BIOSCIENCES INC COM 74587B101 15833501 733372 SH SOLE 733372 0 0 QUALYS INC COM 74758T303 20998610 239028 SH SOLE 239028 0 0 QUANTERIX CORP COM 74766Q101 10369297 2945823 SH SOLE 2945823 0 0 RADNET INC COM 750491102 1326158 23728 SH SOLE 23728 0 0 RANPAK HOLDINGS CORP COM CL A 75321W103 6953221 1947681 SH SOLE 1947681 0 0 REGAL REXNORD CORPORATION COM 758750103 10107359 53975 SH SOLE 53975 0 0 REMITLY GLOBAL INC COM 75960P104 10940261 698166 SH SOLE 698166 0 0 REPAY HLDGS CORP COM CL A 76029L100 7426063 2856178 SH SOLE 2856178 0 0 SANDRIDGE ENERGY INC COM NEW 80007P869 2015769 123591 SH SOLE 123591 0 0 SANMINA CORP COM 801056102 3543320 27332 SH SOLE 27332 0 0 SEMTECH CORP COM 816850101 25552623 332327 SH SOLE 332327 0 0 SEZZLE INC COM 78435P105 4433211 70046 SH SOLE 70046 0 0 SHIFT4 PMTS INC CL A 82452J109 9370639 214284 SH SOLE 214284 0 0 SOLARIS ENERGY INFRAS INC COM CL A 83418M103 1578324 27930 SH SOLE 27930 0 0 SPROUT SOCIAL INC COM CL A 85209W109 3182595 558350 SH SOLE 558350 0 0 TAKE-TWO INTERACTIVE SOFTWAR COM 874054109 6363253 32219 SH SOLE 32219 0 0 TALEN ENERGY CORP COM 87422Q109 26040868 81574 SH SOLE 81574 0 0 TALOS ENERGY INC COM 87484T108 5430092 344549 SH SOLE 344549 0 0 TAPESTRY INC COM 876030107 2404232 17038 SH SOLE 17038 0 0 TECOGEN INC NEW COM NEW 87876P201 1135501 443555 SH SOLE 443555 0 0 TELIX PHARMACEUTICAL LTD SPONSORED ADS 87961M105 5179925 541267 SH SOLE 541267 0 0 THE REAL BROKERAGE INC COM NEW 75585H206 36299620 14519848 SH SOLE 14519848 0 0 TOWER SEMICONDUCTOR LTD SHS NEW M87915274 5622906 32043 SH SOLE 32043 0 0 TRANSMEDICS GROUP INC COM 89377M109 1062494 10688 SH SOLE 10688 0 0 TTM TECHNOLOGIES INC COM 87305R109 70872465 727494 SH SOLE 727494 0 0 TWILIO INC CL A 90138F102 9407436 74769 SH SOLE 74769 0 0 ULTRA CLEAN HLDGS INC COM 90385V107 2095466 33700 SH SOLE 33700 0 0 UNITED THERAPEUTICS CORP DEL COM 91307C102 37615686 63435 SH SOLE 63435 0 0 UPWORK INC COM 91688F104 17213338 1570560 SH SOLE 1570560 0 0 VEECO INSTRS INC DEL COM 922417100 8579413 253379 SH SOLE 253379 0 0 VIAVI SOLUTIONS INC COM 925550105 4853688 145844 SH SOLE 145844 0 0 VICOR CORP COM 925815102 4293870 26670 SH SOLE 26670 0 0 VIRTU FINL INC CL A 928254101 53298790 1211887 SH SOLE 1211887 0 0 VISHAY PRECISION GROUP INC COM 92835K103 44282669 1019868 SH SOLE 1019868 0 0 VNET GROUP INC SPONSORED ADS A 90138A103 6925861 825490 SH SOLE 825490 0 0 WARBY PARKER INC CL A COM 93403J106 10549875 500706 SH SOLE 500706 0 0 WILLDAN GROUP INC COM 96924N100 7193884 93964 SH SOLE 93964 0 0 XPENG INC ADS 98422D105 4712642 275432 SH SOLE 275432 0 0 ZETA GLOBAL HOLDINGS CORP CL A 98956A105 7741434 486271 SH SOLE 486271 0 0