Holders — by stockHoldings — by fund
Portolan Capital Management, LLC
Everything this manager disclosed owning in US-listed stocks — its complete Form 13F portfolio · as of 2026-06-30 · filed with the SEC up to 45 days after quarter end · CIK 0001350290
$2.67B
disclosed book value
148
positions
5.7%
largest position share
Positions, as of 2026-06-30
top 100 of 148 · 13F covers long US-listed positions only — cash, bonds, private and foreign stakes are not disclosed · PUT/CALL tags = options positions (share-equivalents), not shares held
| # | Issuer | Shares | Value | % of book |
|---|---|---|---|---|
| 1 | VPGVISHAY PRECISION GROUP INC | 1.0M | $151.1M | 5.7% |
| 2 | VIRTVIRTU FINL INC | 2.1M | $127.6M | 4.8% |
| 3 | TTMITTM TECHNOLOGIES INC | 507,838 | $95.0M | 3.6% |
| 4 | MODMODINE MFG CO | 313,683 | $83.8M | 3.1% |
| 5 | QLYSQUALYS INC | 529,807 | $72.8M | 2.7% |
| 6 | FOURSHIFT4 PMTS INC | 1.1M | $54.2M | 2% |
| 7 | MECMAYVILLE ENGR CO INC | 1.3M | $48.7M | 1.8% |
| 8 | ENVAENOVA INTL INC | 198,795 | $47.9M | 1.8% |
| 9 | SMTCSEMTECH CORP | 294,619 | $47.7M | 1.8% |
| 10 | CLSCELESTICA INC | 126,856 | $46.3M | 1.7% |
| 11 | UTHRUNITED THERAPEUTICS CORP DEL | 81,518 | $44.2M | 1.7% |
| 12 | GENIUS SPORTS LIMITED | 7.0M | $42.6M | 1.6% |
| 13 | POWLPOWELL INDS INC | 145,631 | $41.7M | 1.6% |
| 14 | PENGPENGUIN SOLUTIONS INC | 546,173 | $41.5M | 1.6% |
| 15 | DAVEDAVE INC | 105,338 | $39.2M | 1.5% |
| 16 | FLEX LTD | 229,027 | $37.1M | 1.4% |
| 17 | ALNTALLIENT INC | 359,685 | $37.0M | 1.4% |
| 18 | PRCHPORCH GROUP INC | 2.5M | $36.9M | 1.4% |
| 19 | AKAMAKAMAI TECHNOLOGIES INC | 310,361 | $36.7M | 1.4% |
| 20 | CADLCANDEL THERAPEUTICS INC | 3.5M | $36.0M | 1.3% |
| 21 | TLNTALEN ENERGY CORP | 90,312 | $34.7M | 1.3% |
| 22 | RRXREGAL REXNORD CORPORATION | 137,498 | $32.8M | 1.2% |
| 23 | LNTHLANTHEUS HLDGS INC | 288,691 | $32.0M | 1.2% |
| 24 | BIIBBIOGEN INC | 142,856 | $30.9M | 1.2% |
| 25 | VECOVEECO INSTRS INC DEL | 401,639 | $30.4M | 1.1% |
| 26 | LUXELUXEXPERIENCE BV | 4.1M | $30.1M | 1.1% |
| 27 | ZETAZETA GLOBAL HOLDINGS CORP | 1.5M | $29.6M | 1.1% |
| 28 | CELLEBRITE DI LTD | 1.9M | $28.2M | 1.1% |
| 29 | SPORTRADAR GROUP AG | 1.8M | $27.2M | 1% |
| 30 | GOOSCANADA GOOSE HLDGS INC | 2.8M | $26.2M | 1% |
| 31 | BANDBANDWIDTH INC | 412,701 | $26.1M | 1% |
| 32 | WRBYWARBY PARKER INC | 843,862 | $25.6M | 1% |
| 33 | KTBKONTOOR BRANDS INC | 292,115 | $24.3M | 0.9% |
| 34 | OSKOSHKOSH CORP | 157,641 | $24.2M | 0.9% |
| 35 | ECPGENCORE CAP GROUP INC | 255,715 | $23.9M | 0.9% |
| 36 | TWLOTWILIO INC | 115,397 | $23.8M | 0.9% |
| 37 | SEZLSEZZLE INC | 135,743 | $23.3M | 0.9% |
| 38 | RELYREMITLY GLOBAL INC | 1.0M | $22.8M | 0.9% |
| 39 | ACMRACM RESH INC | 177,432 | $22.5M | 0.8% |
| 40 | ESIELEMENT SOLUTIONS INC | 469,213 | $22.4M | 0.8% |
| 41 | NOKNOKIA CORP | 1.6M | $21.9M | 0.8% |
| 42 | BBBLACKBERRY LTD | 1.7M | $21.7M | 0.8% |
| 43 | IFFINTERNATIONAL FLAVORS&FRAGRA | 269,229 | $21.3M | 0.8% |
| 44 | PLSEPULSE BIOSCIENCES INC | 753,333 | $20.9M | 0.8% |
| 45 | MOG/AMOOG INC | 49,274 | $20.9M | 0.8% |
| 46 | REAXTHE REAL BROKERAGE INC | 11.0M | $20.1M | 0.8% |
| 47 | CDNACAREDX INC | 684,805 | $19.5M | 0.7% |
| 48 | PARRPAR PAC HOLDINGS INC | 341,863 | $19.2M | 0.7% |
| 49 | VSHVISHAY INTERTECHNOLOGY INC | 351,515 | $18.9M | 0.7% |
| 50 | TTWOTAKE-TWO INTERACTIVE SOFTWAR | 72,487 | $18.1M | 0.7% |
| 51 | GATES INDL CORP PLC | 641,587 | $17.9M | 0.7% |
| 52 | MAMAMAMAS CREATIONS INC | 984,869 | $17.6M | 0.7% |
| 53 | KRUSKURA SUSHI USA INC | 302,010 | $17.4M | 0.7% |
| 54 | SANMSANMINA CORP | 68,255 | $17.3M | 0.6% |
| 55 | PKEPARK AEROSPACE CORP | 447,390 | $17.1M | 0.6% |
| 56 | GHMGRAHAM CORP | 136,925 | $16.9M | 0.6% |
| 57 | BELFBBEL FUSE INC | 47,856 | $15.9M | 0.6% |
| 58 | ON HLDG AG | 441,137 | $15.6M | 0.6% |
| 59 | AMER SPORTS INC | 452,880 | $15.3M | 0.6% |
| 60 | COHUCOHU INC | 206,120 | $15.2M | 0.6% |
| 61 | JBLJABIL INC | 38,929 | $15.0M | 0.6% |
| 62 | ADEAADEIA INC | 443,060 | $14.6M | 0.5% |
| 63 | VICRVICOR CORP | 38,081 | $14.5M | 0.5% |
| 64 | TENBTENABLE HLDGS INC | 387,923 | $14.3M | 0.5% |
| 65 | GEHCGE HEALTHCARE TECHNOLOGIES I | 222,393 | $14.2M | 0.5% |
| 66 | CXTCRANE NXT CO | 271,524 | $13.9M | 0.5% |
| 67 | PACKRANPAK HOLDINGS CORP | 1.9M | $13.9M | 0.5% |
| 68 | ONTOONTO INNOVATION INC | 36,503 | $13.8M | 0.5% |
| 69 | WGSGENEDX HOLDINGS CORP | 200,315 | $13.8M | 0.5% |
| 70 | FORRFORRESTER RESH INC | 1.6M | $13.7M | 0.5% |
| 71 | HZOMARINEMAX INC | 344,358 | $12.6M | 0.5% |
| 72 | BIOBIO RAD LABS INC | 42,620 | $12.5M | 0.5% |
| 73 | QMCOQUANTUM CORP | 1.0M | $11.2M | 0.4% |
| 74 | BIDUBAIDU INC | 95,863 | $11.0M | 0.4% |
| 75 | FERRARI N V | 29,079 | $10.8M | 0.4% |
| 76 | DGIIDIGI INTL INC | 141,243 | $10.6M | 0.4% |
| 77 | LASRNLIGHT INC | 151,867 | $10.6M | 0.4% |
| 78 | VIAVVIAVI SOLUTIONS INC | 220,118 | $10.5M | 0.4% |
| 79 | BOOTBOOT BARN HLDGS INC | 63,759 | $10.5M | 0.4% |
| 80 | LPTHLIGHTPATH TECHNOLOGIES INC | 629,168 | $10.3M | 0.4% |
| 81 | FEIMFREQUENCY ELECTRS INC | 152,818 | $10.1M | 0.4% |
| 82 | HALOHALOZYME THERAPEUTICS INC | 127,498 | $10.0M | 0.4% |
| 83 | OKEANIS ECO TANKERS COR | 195,997 | $9.8M | 0.4% |
| 84 | ERMENEGILDO ZEGNA N V | 753,948 | $9.8M | 0.4% |
| 85 | SGSWEETGREEN INC | 1.0M | $9.1M | 0.3% |
| 86 | TPRTAPESTRY INC | 61,688 | $9.0M | 0.3% |
| 87 | SEISOLARIS ENERGY INFRAS INC | 107,401 | $8.6M | 0.3% |
| 88 | ATENA10 NETWORKS INC | 226,920 | $8.5M | 0.3% |
| 89 | AMBARELLA INC | 97,072 | $8.3M | 0.3% |
| 90 | TECNOGLASS INC | 176,254 | $8.3M | 0.3% |
| 91 | QTRXQUANTERIX CORP | 1.9M | $8.2M | 0.3% |
| 92 | TGENTECOGEN INC NEW | 1.6M | $8.1M | 0.3% |
| 93 | HQYHEALTHEQUITY INC | 89,274 | $8.1M | 0.3% |
| 94 | TOWER SEMICONDUCTOR LTD | 30,557 | $8.0M | 0.3% |
| 95 | CSTLCASTLE BIOSCIENCES INC | 328,818 | $7.8M | 0.3% |
| 96 | SILICOM LTD | 162,466 | $7.8M | 0.3% |
| 97 | CIENCIENA CORP | 15,272 | $7.5M | 0.3% |
| 98 | EBAYEBAY INC. | 65,741 | $7.3M | 0.3% |
| 99 | RBARB GLOBAL INC | 63,009 | $7.3M | 0.3% |
| 100 | XMTRXOMETRY INC | 73,163 | $7.1M | 0.3% |
Source: SEC Form 13F-HR, reporting period 2026-06-30. Values are the manager's filed June-30-style quarter-end marks, not live prices. Research, not investment advice.