Portolan Capital Management, LLC — 13F Holdings & Portfolio
CIK 1350290 · latest 13F-HR filed 2026-08-14
Portolan Capital Management, LLC manages $2.67B in 13F-reported U.S. long-equity assets across 148 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are VPG (5.66%), VIRT (4.78%), TTMI (3.56%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 36 new positions, exited 32, added to 62, and trimmed 39.
AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.
BOSTON, MA 02110
$2.67B
Long-equity book
148
Distinct positions
2026-06-30
Filed 2026-08-14
+36 / −32 / ↑62 / ↓39
vs 2026-03-31
| Name | Title / Status | Ownership | Type |
|---|
Top Adds (vs prior quarter)
- VISHAY PRECISION GROUP INC$106.9M +241.3%
- VIRTU FINL INC$74.3M +139.4%
- QUALYS INC$51.8M +246.9%
- SHIFT4 PMTS INC$44.8M +478.3%
- ENOVA INTL INC$36.9M +335.4%
Top Trims
- BAIDU INC-$29.9M -73.2%
- CASTLE BIOSCIENCES INC-$25.3M -76.3%
- FABRINET-$25.0M -87.4%
- PAR PAC HOLDINGS INC-$24.3M -55.9%
- OKEANIS ECO TANKERS COR-$17.4M -64.0%
New Positions
- PENGUIN SOLUTIONS INC$41.5M
- SPORTRADAR GROUP AG$27.2M
- BANDWIDTH INC$26.1M
- KONTOOR BRANDS INC$24.3M
- ENCORE CAP GROUP INC$23.9M
Exited Positions
- PBF ENERGY INC$38.1M
- CRESCENT ENERGY COMPANY$35.1M
- CORE NATURAL RESOURCES INC$24.8M
- MURPHY USA INC$23.8M
- CIRCLE INTERNET GROUP INC$20.4M
Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).
| # | Issuer | Symbol | CUSIP | Value | Weight | Shares | Type |
|---|---|---|---|---|---|---|---|
| 1 | VISHAY PRECISION GROUP INC | VPG | 92835K103 | $151.1M | 5.66% | 1,008,167 | SH |
| 2 | VIRTU FINL INC | VIRT | 928254101 | $127.6M | 4.78% | 2,142,215 | SH |
| 3 | TTM TECHNOLOGIES INC | TTMI | 87305R109 | $95.0M | 3.56% | 507,838 | SH |
| 4 | MODINE MFG CO | MOD | 607828100 | $83.8M | 3.14% | 313,683 | SH |
| 5 | QUALYS INC | QLYS | 74758T303 | $72.8M | 2.73% | 529,807 | SH |
| 6 | SHIFT4 PMTS INC | FOUR | 82452J109 | $54.2M | 2.03% | 1,114,116 | SH |
| 7 | MAYVILLE ENGR CO INC | MEC | 578605107 | $48.7M | 1.82% | 1,299,256 | SH |
| 8 | ENOVA INTL INC | ENVA | 29357K103 | $47.9M | 1.79% | 198,795 | SH |
| 9 | SEMTECH CORP | SMTC | 816850101 | $47.7M | 1.79% | 294,619 | SH |
| 10 | CELESTICA INC | CLS | 15101Q207 | $46.3M | 1.73% | 126,856 | SH |
| 11 | UNITED THERAPEUTICS CORP DEL | UTHR | 91307C102 | $44.2M | 1.65% | 81,518 | SH |
| 12 | GENIUS SPORTS LIMITED | GENI | G3934V109 | $42.6M | 1.59% | 7,025,809 | SH |
| 13 | POWELL INDS INC | POWL | 739128106 | $41.7M | 1.56% | 145,631 | SH |
| 14 | PENGUIN SOLUTIONS INC | PENG | 706915105 | $41.5M | 1.55% | 546,173 | SH |
| 15 | DAVE INC | DAVE | 23834J201 | $39.2M | 1.47% | 105,338 | SH |
| 16 | FLEX LTD | FLEX | Y2573F102 | $37.1M | 1.39% | 229,027 | SH |
| 17 | ALLIENT INC | ALNT | 019330109 | $37.0M | 1.39% | 359,685 | SH |
| 18 | PORCH GROUP INC | PRCH | 733245104 | $36.9M | 1.38% | 2,456,451 | SH |
| 19 | AKAMAI TECHNOLOGIES INC | AKAM | 00971T101 | $36.7M | 1.37% | 310,361 | SH |
| 20 | CANDEL THERAPEUTICS INC | CADL | 137404109 | $36.0M | 1.35% | 3,490,398 | SH |
| 21 | TALEN ENERGY CORP | TLN | 87422Q109 | $34.7M | 1.30% | 90,312 | SH |
| 22 | REGAL REXNORD CORPORATION | RRX | 758750103 | $32.8M | 1.23% | 137,498 | SH |
| 23 | LANTHEUS HLDGS INC | LNTH | 516544103 | $32.0M | 1.20% | 288,691 | SH |
| 24 | BIOGEN INC | BIIB | 09062X103 | $30.9M | 1.16% | 142,856 | SH |
| 25 | VEECO INSTRS INC DEL | VECO | 922417100 | $30.4M | 1.14% | 401,639 | SH |
| 26 | LUXEXPERIENCE BV | LUXE | 55406W103 | $30.1M | 1.13% | 4,053,147 | SH |
| 27 | ZETA GLOBAL HOLDINGS CORP | ZETA | 98956A105 | $29.6M | 1.11% | 1,502,738 | SH |
| 28 | CELLEBRITE DI LTD | CLBT | M2197Q107 | $28.2M | 1.06% | 1,932,514 | SH |
| 29 | SPORTRADAR GROUP AG | SRAD | H8088L103 | $27.2M | 1.02% | 1,819,949 | SH |
| 30 | CANADA GOOSE HLDGS INC | GOOS | 135086106 | $26.2M | 0.98% | 2,750,523 | SH |
| 31 | BANDWIDTH INC | BAND | 05988J103 | $26.1M | 0.98% | 412,701 | SH |
| 32 | WARBY PARKER INC | WRBY | 93403J106 | $25.6M | 0.96% | 843,862 | SH |
| 33 | KONTOOR BRANDS INC | KTB | 50050N103 | $24.3M | 0.91% | 292,115 | SH |
| 34 | OSHKOSH CORP | OSK | 688239201 | $24.2M | 0.91% | 157,641 | SH |
| 35 | ENCORE CAP GROUP INC | ECPG | 292554102 | $23.9M | 0.89% | 255,715 | SH |
| 36 | TWILIO INC | TWLO | 90138F102 | $23.8M | 0.89% | 115,397 | SH |
| 37 | SEZZLE INC | SEZL | 78435P105 | $23.3M | 0.87% | 135,743 | SH |
| 38 | REMITLY GLOBAL INC | RELY | 75960P104 | $22.8M | 0.85% | 1,017,592 | SH |
| 39 | ACM RESH INC | ACMR | 00108J109 | $22.5M | 0.84% | 177,432 | SH |
| 40 | ELEMENT SOLUTIONS INC | ESI | 28618M106 | $22.4M | 0.84% | 469,213 | SH |
| 41 | NOKIA CORP | NOK | 654902204 | $21.9M | 0.82% | 1,645,761 | SH |
| 42 | BLACKBERRY LTD | BB | 09228F103 | $21.7M | 0.81% | 1,714,461 | SH |
| 43 | INTERNATIONAL FLAVORS&FRAGRA | IFF | 459506101 | $21.3M | 0.80% | 269,229 | SH |
| 44 | PULSE BIOSCIENCES INC | PLSE | 74587B101 | $20.9M | 0.78% | 753,333 | SH |
| 45 | MOOG INC | MOG.A | 615394202 | $20.9M | 0.78% | 49,274 | SH |
| 46 | THE REAL BROKERAGE INC | REAX | 75585H206 | $20.1M | 0.75% | 11,042,364 | SH |
| 47 | CAREDX INC | CDNA | 14167L103 | $19.5M | 0.73% | 684,805 | SH |
| 48 | PAR PAC HOLDINGS INC | PARR | 69888T207 | $19.2M | 0.72% | 341,863 | SH |
| 49 | VISHAY INTERTECHNOLOGY INC | VSH | 928298108 | $18.9M | 0.71% | 351,515 | SH |
| 50 | TAKE-TWO INTERACTIVE SOFTWAR | TTWO | 874054109 | $18.1M | 0.68% | 72,487 | SH |
| Period | Filed | AUM | Holdings | Accession |
|---|---|---|---|---|
| 2026-06-30 | 2026-08-14 | $2.67B | 148 | 0001104659-26-096980 |
| 2026-03-31 | 2026-05-15 | $1.88B | 144 | 0001104659-26-062488 |
| 2025-12-31 | 2026-02-17 | $1.87B | 155 | 0001104659-26-016304 |
| 2025-09-30 | 2025-11-13 | $1.85B | 119 | 0001104659-25-111284 |