CIK: 0001350290
Total reported value
$1.9B
Reporting period: 2026-03-31 · Number of holdings: 144
Portolan Capital Management, LLC disclosed 144 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $1.9B and a quarterly turnover rate of 73.9%.
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Portolan Capital Management, LLC's disclosed holdings carry a Herfindahl concentration index of 0.015 — mathematically equivalent to about 65 equally-sized positions, well below its 144 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 1.11), suggesting a disciplined, rules-based approach to how much capital goes into each idea.
No strong tilt toward either adding to existing winners or initiating outsized new positions was observed in the latest reported quarter.
Sector classification currently covers about 59% of this portfolio's disclosed value; the remainder includes holdings (e.g. unmapped tickers, options, or other security types) not yet covered by our sector mapping.
Add VIRT
+222.1% $40.8M
Add CRGY
+6419.2% $34.8M
Trim CSTL
-21.9% -$34.1M
Add FN
+403.4% $23.6M
Add ECO
+233.0% $21.8M
Trim FOUR
-54.2% -$20.1M
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | MOD | Modine Manufacturing Co | Stock-Consumer Disc | 4.75% | +0.92% | -23.11% | |
| 2 | TTMI | Ttm Technologies | Stock-Tech | 3.77% | — | -36.56% | |
| 3 | CLS | Celestica INC | Stock-Tech | 2.97% | — | +14.85% | |
| 4 | VIRT | Virtu Financial Inc-class A | Stock-Financials | 2.84% | +2.17% | +222.07% | |
| 5 | AKAM | Akamai Technologies INC | Stock-Tech | 2.59% | — | -19.24% | |
| 6 | VPG | Vishay Precision Group | Stock-Other | 2.36% | +0.55% | +16.20% | |
| 7 | PARR | Par Pacific Holdings INC | Stock-Energy | 2.31% | +2.31% | NEW | |
| 8 | POWL | Powell Industries INC | Stock-Industrials | 2.18% | +0.83% | -4.15% | |
| 9 | BIDU | Baidu INC - Spon Adr | Stock-Comm Services | 2.17% | — | +38.97% | |
| 10 | PBF | Pbf Energy Inc-class A | Stock-Energy | 2.03% | +2.03% | NEW | |
| 11 | UTHR | United Therapeutics CORP | Stock-Healthcare | 2.00% | +1.04% | +72.60% | |
| 12 | REAX | Real Brokerage Inc/the | Stock-Other | 1.93% | — | +34.69% | |
| 13 | GOOS | Canada Goose Holdings INC | Stock-Other | 1.88% | — | +50.46% | |
| 14 | CRGY | Crescent Energy Inc-a | Stock-Energy | 1.87% | +1.85% | +6419.15% | |
| 15 | CSTL | Castle Biosciences INC | Stock-Other | 1.76% | -1.84% | -21.92% | |
| 16 | LNTH | Lantheus Holdings INC | Stock-Healthcare | 1.68% | — | -12.27% | |
| 17 | CLBT | Cellebrite DI Ltd. | Stock-Other | 1.60% | — | +69.42% | |
| 18 | LUXE | Luxexperience BV | Stock-Other | 1.59% | — | +40.34% | |
| 19 | FLEX | Flex Ltd. | Stock-Tech | 1.54% | — | -5.09% | |
| 20 | FN | Fabrinet | Stock-Tech | 1.52% | +1.25% | +403.43% | |
| 21 | ECO | Okeanis Eco Tankers Corp. | Stock-Other | 1.45% | +1.16% | +233.01% | |
| 22 | TLN | Talen Energy CORP | Stock-Utilities | 1.39% | — | +8.79% | |
| 23 | SMTC | Semtech CORP | Stock-Tech | 1.36% | -0.65% | -34.67% | |
| 24 | CNR | Core Natural Resources INC | Stock-Energy | 1.32% | +0.70% | +82.00% | |
| 25 | MUSA | Murphy USA INC | Stock-Consumer Disc | 1.26% | +1.26% | NEW | |
| 26 | BIIB | Biogen INC | Stock-Healthcare | 1.16% | — | +39.41% | |
| 27 | KRUS | Kura Sushi USA Inc-class A | Stock-Other | 1.12% | +0.59% | +57.87% | |
| 28 | QLYS | Qualys INC | Stock-Tech | 1.12% | +0.75% | +360.95% | |
| 29 | JBL | Jabil INC | Stock-Tech | 1.09% | — | +9.24% | |
| 30 | CRCL | Circle Internet Group INC | Stock-Financials | 1.09% | +1.09% | NEW | |
| 31 | DHT | DHT Holdings, Inc. | Stock-Other | 1.06% | +1.06% | NEW | |
| 32 | NOK | Nokia Corp-spon Adr | Stock-Tech | 1.02% | +0.65% | +122.46% | |
| 33 | ALNT | Allient INC | Stock-Other | 1.02% | — | +7.14% | |
| 34 | PRIM | Primoris Services CORP | Stock-Industrials | 0.99% | — | +23.56% | |
| 35 | DAVE | Dave INC | Stock-Other | 0.98% | — | +139.64% | |
| 36 | KTOS | Kratos Defense & Security | Stock-Industrials | 0.97% | — | -11.63% | |
| 37 | MAMA | Mama's Creations INC | Stock-Other | 0.96% | — | -5.53% | |
| 38 | ADEA | Adeia INC | Stock-Other | 0.93% | +0.69% | +184.71% | |
| 39 | UPWK | Upwork INC | Stock-Other | 0.92% | — | +118.24% | |
| 40 | PLSE | Pulse Biosciences INC | Stock-Other | 0.84% | +0.55% | +86.37% | |
| 41 | PRCH | Porch Group INC | Stock-Other | 0.82% | — | +2.97% | |
| 42 | HAFN | Hafnia Limited | Stock-Other | 0.79% | +0.79% | NEW | |
| 43 | MEC | Mayville Engineering Co INC | Stock-Other | 0.78% | — | +60.14% | |
| 44 | CADL | Candel Therapeutics INC | Stock-Other | 0.75% | — | +70.72% | |
| 45 | LASR | Nlight INC | Stock-Other | 0.68% | — | -61.79% | |
| 46 | GENI | Genius Sports Limited | Stock-Other | 0.66% | -1.07% | -5.01% | |
| 47 | AS | Amer Sports, Inc. | Stock-Consumer Disc | 0.63% | +0.63% | NEW | |
| 48 | EBAY | Ebay INC | Stock-Consumer Disc | 0.61% | — | +116.87% | |
| 49 | PKE | Park Aerospace CORP | Stock-Other | 0.60% | — | +67.59% | |
| 50 | ENVA | Enova International INC | Stock-Financials | 0.58% | — | -17.30% |
Performance for Q3 2026
+9.7%
Performance Last 4 Quarters
+61.8%
Based on 78% of reported portfolio value with available pricing
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 144 | $1.9B | 74 | |
| 2025-12-31 | 155 | $1.9B | 73 | |
| 2025-09-30 | 119 | $1.8B | 100 | |
| 2025-06-30 | 118 | $1.6B | 0 | |
| 2025-03-31 | 109 | $1.3B | 100 | |
| 2024-12-31 | 131 | $1.5B | 0 | |
| 2024-09-30 | 129 | $1.4B | 0 | |
| 2024-06-30 | 117 | $1.2B | 0 | |
| 2024-03-31 | 116 | $1.3B | 0 | |
| 2023-12-31 | 127 | $1.1B | 0 | |
| 2023-09-30 | 123 | $1.1B | 0 | |
| 2023-06-30 | 120 | $1.1B | 0 | |
| 2023-03-31 | 139 | $1.0B | 0 | |
| 2022-12-31 | 131 | $1.0B | 0 | |
| 2022-09-30 | 128 | $946.2M | 0 | |
| 2022-06-30 | 123 | $993.2M | 0 | |
| 2022-03-31 | 136 | $1.3B | 0 | |
| 2021-12-31 | 131 | $1.5B | 0 | |
| 2021-09-30 | 134 | $1.4B | 0 | |
| 2021-06-30 | 131 | $1.4B | 65 | |
| 2021-03-31 | 151 | $1.3B | 62 | |
| 2020-12-31 | 164 | $1.1B | 85 | |
| 2020-09-30 | 139 | $883.8M | 75 | |
| 2020-06-30 | 128 | $875.6M | 87 | |
| 2020-03-31 | 112 | $666.6M | 100 | |
| 2019-12-31 | 95 | $989.9M | 47 | |
| 2019-09-30 | 87 | $887.1M | 52 | |
| 2019-06-30 | 88 | $929.7M | 49 | |
| 2019-03-31 | 87 | $972.0M | 77 | |
| 2018-12-31 | 82 | $806.8M | 62 | |
| 2018-09-30 | 96 | $1.0B | 39 | |
| 2018-06-30 | 99 | $979.4M | 48 | |
| 2018-03-31 | 100 | $912.9M | 47 | |
| 2017-12-31 | 116 | $913.1M | 48 | |
| 2017-09-30 | 111 | $838.8M | 61 | |
| 2017-06-30 | 117 | $779.2M | 70 | |
| 2017-03-31 | 120 | $769.7M | 68 | |
| 2016-12-31 | 125 | $742.7M | 80 | |
| 2016-09-30 | 109 | $728.7M | 59 | |
| 2016-06-30 | 109 | $694.4M | 61 | |
| 2016-03-31 | 111 | $746.8M | 78 | |
| 2015-12-31 | 123 | $789.0M | 73 | |
| 2015-09-30 | 114 | $754.7M | 67 | |
| 2015-06-30 | 119 | $715.0M | 65 | |
| 2015-03-31 | 113 | $545.1M | 75 | |
| 2014-12-31 | 106 | $499.2M | 100 | |
| 2014-09-30 | 104 | $440.3M | 68 | |
| 2014-06-30 | 119 | $457.8M | 63 | |
| 2014-03-31 | 139 | $434.4M | 68 | |
| 2013-12-31 | 119 | $451.0M | 70 | |
| 2013-09-30 | 133 | $381.8M | 70 | |
| 2013-06-30 | 158 | $351.0M | 0 |
Portolan Capital Management, LLC's most significant position changes for 2026-03-31: New buy: Par Pacific Holdings INC (PARR); New buy: Pbf Energy Inc-class A (PBF); New buy: Murphy USA INC (MUSA); Sold out: First Solar INC (FSLR); New buy: Circle Internet Group INC (CRCL).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | VIRT | Virtu Financial Inc-class A | +2.2% | +222.07% | Add |
| 2 | CRGY | Crescent Energy Inc-a | +1.9% | +6419.15% | Add |
| 3 | FN | Fabrinet | +1.3% | +403.43% | Add |
| 4 | ECO | Okeanis Eco Tankers Corp. | +1.2% | +233.01% | Add |
| 5 | UTHR | United Therapeutics CORP | +1% | +72.60% | Add |
| 6 | MOD | Modine Manufacturing Co | +0.9% | -23.11% | Trim |
| 7 | POWL | Powell Industries INC | +0.8% | -4.15% | Trim |
| 8 | QLYS | Qualys INC | +0.8% | +360.95% | Add |
| 9 | CNR | Core Natural Resources INC | +0.7% | +82.00% | Add |
| 10 | ADEA | Adeia INC | +0.7% | +184.71% | Add |
| 11 | NOK | Nokia Corp-spon Adr | +0.7% | +122.46% | Add |
| 12 | KRUS | Kura Sushi USA Inc-class A | +0.6% | +57.87% | Add |
| 13 | VPG | Vishay Precision Group | +0.6% | +16.20% | Add |
| 14 | PLSE | Pulse Biosciences INC | +0.6% | +86.37% | Add |
| 15 | TMDX | Transmedics Group INC | -0.6% | -88.97% | Trim |
| 16 | TSEM | Tower Semiconductor Ltd. | -0.6% | -78.43% | Trim |
| 17 | SMTC | Semtech CORP | -0.7% | -34.67% | Trim |
| 18 | IIIV | I3 Verticals Inc-class A | -0.7% | -69.16% | Trim |
| 19 | BELFB | Bel Fuse Inc-cl B | -0.7% | -61.89% | Trim |
| 20 | AVAV | Aerovironment INC | -0.7% | -64.61% | Trim |
| 21 | LPTH | Lightpath Technologies Inc-a | -0.8% | -55.39% | Trim |
| 22 | WRBY | Warby Parker Inc-class A | -0.9% | -59.36% | Trim |
| 23 | DOMO | Domo INC - Class B | -1% | -90.87% | Trim |
| 24 | QTRX | Quanterix CORP | -1% | -34.91% | Trim |
| 25 | ZETA | Zeta Global Holdings Corp-a | -1% | -63.13% | Trim |
| 26 | GENI | Genius Sports Limited | -1.1% | -5.01% | Trim |
| 27 | FOUR | Shift4 Payments Inc-class A | -1.1% | -54.22% | Trim |
| 28 | CSTL | Castle Biosciences INC | -1.8% | -21.92% | Trim |
| 29 | PARR | Par Pacific Holdings INC | — | NEW | New buy |
| 30 | PBF | Pbf Energy Inc-class A | — | NEW | New buy |
| 31 | MUSA | Murphy USA INC | — | NEW | New buy |
| 32 | FSLR | First Solar INC | — | EXIT | Sold out |
| 33 | CRCL | Circle Internet Group INC | — | NEW | New buy |
| 34 | DHT | DHT Holdings, Inc. | — | NEW | New buy |
| 35 | FAF | First American Financial | — | EXIT | Sold out |
| 36 | SPHR | Sphere Entertainment Co | — | EXIT | Sold out |
| 37 | MRX | Marex Group plc | — | EXIT | Sold out |
| 38 | HAFN | Hafnia Limited | — | NEW | New buy |
| 39 | TECH | Bio-techne CORP | — | EXIT | Sold out |
| 40 | FCX | Freeport-mcmoran INC | — | EXIT | Sold out |
| 41 | MGA | Magna International INC | — | EXIT | Sold out |
| 42 | SNAP | Snap INC - A | — | EXIT | Sold out |
| 43 | TGLS | Tecnoglass Inc. | — | EXIT | Sold out |
| 44 | HZO | Marinemax INC | — | EXIT | Sold out |
| 45 | AS | Amer Sports, Inc. | — | NEW | New buy |
| 46 | EVLV | Evolv Technologies Holdings | — | NEW | New buy |
| 47 | ZG | Zillow Group INC - A | — | EXIT | Sold out |
| 48 | METC | Ramaco Resources Inc-a | — | EXIT | Sold out |
| 49 | AMSC | American Superconductor CORP | — | NEW | New buy |
| 50 | TWLO | Twilio INC - A | — | NEW | New buy |
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-15 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-17 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-13 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-13 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-15 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-13 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-14 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-14 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-15 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-14 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-14 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-14 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-15 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-13 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-14 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-15 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-05-16 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-14 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-15 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-16 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-17 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-16 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-16 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-14 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-14 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-14 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2019-11-14 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2019-08-14 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-15 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-13 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-14 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-14 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-14 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-14 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-11-14 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-14 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-15 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-14 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-14 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-12 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-13 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-12 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-13 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-14 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-05-15 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-02-11 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-11-13 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-08-12 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-05-15 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-02-13 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-11-08 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-08-09 | 13F-HR | View on EDGAR |
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