Portolan Capital Management, LLC 13F holdings
Portolan Capital Management, LLC reported 148 positions with a total reported value of $2.7B as of 2026-06-30, in its 13F for Q2 2026, filed 2026-08-14. Top holdings by reported value: VPG VISHAY PRECISION GROUP INC (5.7%), VIRTU FINL INC (4.8%), TTMI TTM TECHNOLOGIES INC (3.6%), MODINE MFG CO (3.1%), QLYS QUALYS INC (2.7%). Against 2026-03-31 it opened 36 new positions and exited 32. Next 13F due by 2026-11-14, the legal deadline 45 days after the quarter ending 2026-09-30.
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Top holdings
25 largest of 148 positions · reported value as of 2026-06-30
| Holding | Shares | Reported value | % of portfolio |
|---|---|---|---|
| VPG VISHAY PRECISION GROUP INC | 1,008,167 | $151.1M | 5.7% |
| VIRTU FINL INC | 2,142,215 | $127.6M | 4.8% |
| TTMI TTM TECHNOLOGIES INC | 507,838 | $95.0M | 3.6% |
| MODINE MFG CO | 313,683 | $83.8M | 3.1% |
| QLYS QUALYS INC | 529,807 | $72.8M | 2.7% |
| SHIFT4 PMTS INC | 1,114,116 | $54.2M | 2.0% |
| MAYVILLE ENGR CO INC | 1,299,256 | $48.7M | 1.8% |
| ENOVA INTL INC | 198,795 | $47.9M | 1.8% |
| SMTC SEMTECH CORP | 294,619 | $47.7M | 1.8% |
| CLS CELESTICA INC | 126,856 | $46.3M | 1.7% |
| UTHR UNITED THERAPEUTICS CORP DEL | 81,518 | $44.2M | 1.7% |
| GENI GENIUS SPORTS LIMITED | 7,025,809 | $42.6M | 1.6% |
| POWELL INDS INC | 145,631 | $41.7M | 1.6% |
| PENG PENGUIN SOLUTIONS INC | 546,173 | $41.5M | 1.6% |
| DAVE DAVE INC | 105,338 | $39.2M | 1.5% |
| FLEX FLEX LTD | 229,027 | $37.1M | 1.4% |
| ALNT ALLIENT INC | 359,685 | $37.0M | 1.4% |
| PRCH PORCH GROUP INC | 2,456,451 | $36.9M | 1.4% |
| AKAM AKAMAI TECHNOLOGIES INC | 310,361 | $36.7M | 1.4% |
| CADL CANDEL THERAPEUTICS INC | 3,490,398 | $36.0M | 1.3% |
| TLN TALEN ENERGY CORP | 90,312 | $34.7M | 1.3% |
| RRX REGAL REXNORD CORPORATION | 137,498 | $32.8M | 1.2% |
| LNTH LANTHEUS HLDGS INC | 288,691 | $32.0M | 1.2% |
| BIIB BIOGEN INC | 142,856 | $30.9M | 1.2% |
| VEECO INSTRS INC DEL | 401,639 | $30.4M | 1.1% |
SEC FORM 13F · Q2 2026 · VALUES AS REPORTED, NOT PRICES
New positions this quarter
Held at 2026-06-30, not at 2026-03-31 · 36 in all · reported value as of 2026-06-30
| Holding | Shares | Reported value | % of portfolio |
|---|---|---|---|
| PENG PENGUIN SOLUTIONS INC | 546,173 | $41.5M | 1.6% |
| SRAD SPORTRADAR GROUP AG | 1,819,949 | $27.2M | 1.0% |
| BAND BANDWIDTH INC | 412,701 | $26.1M | 1.0% |
| KTB KONTOOR BRANDS INC | 292,115 | $24.3M | 0.9% |
| ECPG ENCORE CAP GROUP INC | 255,715 | $23.9M | 0.9% |
| BB BLACKBERRY LTD | 1,714,461 | $21.7M | 0.8% |
| IFF INTERNATIONAL FLAVORS&FRAGRA | 269,229 | $21.3M | 0.8% |
| VSH VISHAY INTERTECHNOLOGY INC | 351,515 | $18.9M | 0.7% |
| GATES INDL CORP PLC | 641,587 | $17.9M | 0.7% |
| COHU COHU INC | 206,120 | $15.2M | 0.6% |
| TENB TENABLE HLDGS INC | 387,923 | $14.3M | 0.5% |
| GEHC GE HEALTHCARE TECHNOLOGIES I | 222,393 | $14.2M | 0.5% |
| CXT CRANE NXT CO | 271,524 | $13.9M | 0.5% |
| HZO MARINEMAX INC | 344,358 | $12.6M | 0.5% |
| QMCO QUANTUM CORP | 1,020,120 | $11.2M | 0.4% |
| RACE FERRARI N V | 29,079 | $10.8M | 0.4% |
| BOOT BOOT BARN HLDGS INC | 63,759 | $10.5M | 0.4% |
| HALO HALOZYME THERAPEUTICS INC | 127,498 | $10.0M | 0.4% |
| SG SWEETGREEN INC | 1,029,016 | $9.1M | 0.3% |
| ATEN A10 NETWORKS INC | 226,920 | $8.5M | 0.3% |
| TGLS TECNOGLASS INC | 176,254 | $8.3M | 0.3% |
| SILC SILICOM LTD | 162,466 | $7.8M | 0.3% |
| RBA RB GLOBAL INC | 63,009 | $7.3M | 0.3% |
| XMTR XOMETRY INC | 73,163 | $7.1M | 0.3% |
| MTRN MATERION CORP | 20,860 | $6.2M | 0.2% |
Sold out
Held at 2026-03-31, gone by 2026-06-30 · 32 in all · reported value as of 2026-03-31
| Holding | Shares 2026-03-31 | Reported value | % of portfolio then |
|---|---|---|---|
| PBF PBF ENERGY INC | 799,998 | $38.1M | 2.0% |
| CRGY CRESCENT ENERGY COMPANY | 2,601,142 | $35.1M | 1.9% |
| CNR CORE NATURAL RESOURCES INC | 237,036 | $24.8M | 1.3% |
| MUSA MURPHY USA INC | 48,107 | $23.8M | 1.3% |
| CRCL CIRCLE INTERNET GROUP INC | 213,796 | $20.4M | 1.1% |
| PRIMORIS SVCS CORP | 130,626 | $18.7M | 1.0% |
| UPWK UPWORK INC | 1,570,560 | $17.2M | 0.9% |
| RPAY REPAY HLDGS CORP | 2,856,178 | $7.4M | 0.4% |
| ACLS AXCELIS TECHNOLOGIES INC | 77,168 | $7.2M | 0.4% |
| VNET VNET GROUP INC | 825,490 | $6.9M | 0.4% |
| NOG NORTHERN OIL & GAS INC | 204,244 | $6.0M | 0.3% |
| BL BLACKLINE INC | 159,026 | $5.9M | 0.3% |
| CENX CENTURY ALUM CO | 95,039 | $5.6M | 0.3% |
| MIAMI INTL HLDGS INC | 128,819 | $5.0M | 0.3% |
| AVAV AEROVIRONMENT INC | 26,880 | $4.9M | 0.3% |
| XPEV XPENG INC | 275,432 | $4.7M | 0.3% |
| PSNL PERSONALIS INC | 736,713 | $4.7M | 0.2% |
| IIIV I3 VERTICALS INC | 207,274 | $4.6M | 0.2% |
| PUMP PROPETRO HLDG CORP | 314,815 | $4.5M | 0.2% |
| FPS FORGENT POWER SOLUTIONS INC | 117,933 | $3.5M | 0.2% |
| DPRO DRAGANFLY INC. | 682,730 | $3.4M | 0.2% |
| GDOT GREEN DOT CORP | 298,697 | $3.4M | 0.2% |
| SPT SPROUT SOCIAL INC | 558,350 | $3.2M | 0.2% |
| XZO EXZEO GROUP INC | 209,885 | $3.1M | 0.2% |
| AMPL AMPLITUDE INC | 359,593 | $2.5M | 0.1% |
Biggest increases and decreases
Positions held at both quarter ends, by change in shares · reported value as of 2026-06-30
Increases
| Holding | Shares 2026-03-31 | Shares 2026-06-30 | Change | Reported value |
|---|---|---|---|---|
| VIRTU FINL INC | 1,211,887 | 2,142,215 | +76.8% | $127.6M |
| SHIFT4 PMTS INC | 214,284 | 1,114,116 | +419.9% | $54.2M |
| QLYS QUALYS INC | 239,028 | 529,807 | +121.7% | $72.8M |
| ENOVA INTL INC | 80,923 | 198,795 | +145.7% | $47.9M |
| GENI GENIUS SPORTS LIMITED | 2,791,018 | 7,025,809 | +151.7% | $42.6M |
| OSK OSHKOSH CORP | 18,185 | 157,641 | +766.9% | $24.2M |
| ZETA ZETA GLOBAL HOLDINGS CORP | 486,271 | 1,502,738 | +209.0% | $29.6M |
| POWELL INDS INC | 75,830 | 145,631 | +92.0% | $41.7M |
| RRX REGAL REXNORD CORPORATION | 53,975 | 137,498 | +154.7% | $32.8M |
| MAYVILLE ENGR CO INC | 821,136 | 1,299,256 | +58.2% | $48.7M |
| ACM RESH INC | 83,256 | 177,432 | +113.1% | $22.5M |
| ESI ELEMENT SOLUTIONS INC | 221,232 | 469,213 | +112.1% | $22.4M |
Decreases
| Holding | Shares 2026-03-31 | Shares 2026-06-30 | Change | Reported value |
|---|---|---|---|---|
| TTMI TTM TECHNOLOGIES INC | 727,494 | 507,838 | -30.2% | $95.0M |
| FLEX FLEX LTD | 443,128 | 229,027 | -48.3% | $37.1M |
| BIDU BAIDU INC | 366,429 | 95,863 | -73.8% | $11.0M |
| FN FABRINET | 54,763 | 6,418 | -88.3% | $3.6M |
| MODINE MFG CO | 412,092 | 313,683 | -23.9% | $83.8M |
| CLS CELESTICA INC | 197,863 | 126,856 | -35.9% | $46.3M |
| CSTL CASTLE BIOSCIENCES INC | 1,350,283 | 328,818 | -75.6% | $7.8M |
| LPRO OPEN LENDING CORP | 6,902,888 | 182,803 | -97.4% | $568.5K |
| PARR PAR PAC HOLDINGS INC | 693,834 | 341,863 | -50.7% | $19.2M |
| ECO OKEANIS ECO TANKERS COR | 538,860 | 195,997 | -63.6% | $9.8M |
| JBL JABIL INC | 77,197 | 38,929 | -49.6% | $15.0M |
| LNTH LANTHEUS HLDGS INC | 417,390 | 288,691 | -30.8% | $32.0M |
CIK 1350290 · 13F FILINGS ON EDGAR · INFORMATIONAL ONLY
