1y return+51.6%S&P 500 +20.9%
3y return+91.8%S&P 500 +68.5%
5y return+59.5%S&P 500 +74.5%
10y return+320.5%S&P 500 +256.5%
These returns are for its stock picks as disclosed on Form 13F: last quarter's holdings, valued at this quarter's prices. They miss trades within each quarter, short positions, options, bonds, cash and fees, so they aren't the returns its clients got.
$100 invested in its stock picks
Since June 30, 2016: $420 against $357 in the S&P 500.2
Portolan Capital Management, LLCS&P 500 (SPY)
Top holdings
At the end of June 30, 2026. Change is in shares since the quarter before.2
| Stock | Value | Share of portfolio | Change |
|---|---|---|---|
| VPGVishay Precision Group Inc | $151.1M | 5.7% | −1.1% |
| VIRTVirtu Finl Inc | $127.6M | 4.8% | +76.8% |
| TTMITtm Technologies Inc | $95.0M | 3.6% | −30.2% |
| MODModine Mfg Co | $83.8M | 3.1% | −23.9% |
| QLYSQualys Inc | $72.8M | 2.7% | +121.7% |
| FOURShift4 Pmts Inc | $54.2M | 2.0% | +419.9% |
| MECMayville Engr Co Inc | $48.7M | 1.8% | +58.2% |
| ENVAEnova Intl Inc | $47.9M | 1.8% | +145.7% |
| SMTCSemtech Corp | $47.7M | 1.8% | −11.3% |
| CLSCelestica Inc | $46.3M | 1.7% | −35.9% |
| UTHRUnited Therapeutics Corp Del | $44.2M | 1.7% | +28.5% |
| Genius Sports LimitedCUSIP G3934V109 | $42.6M | 1.6% | +151.7% |
| POWLPowell Inds Inc | $41.7M | 1.6% | −36.0% |
| PENGPenguin Solutions Inc | $41.5M | 1.6% | New |
| DAVEDave Inc | $39.2M | 1.5% | |
| Flex LtdCUSIP Y2573F102 | $37.1M | 1.4% | −48.3% |
| ALNTAllient Inc | $37.0M | 1.4% | +11.2% |
| PRCHPorch Group Inc | $36.9M | 1.4% | +14.5% |
| AKAMAkamai Technologies Inc | $36.7M | 1.4% | −26.7% |
| CADLCandel Therapeutics Inc | $36.0M | 1.3% | +20.6% |
| TLNTalen Energy Corp | $34.7M | 1.3% | +10.7% |
| RRXRegal Rexnord Corporation | $32.8M | 1.2% | +154.7% |
| LNTHLantheus Hldgs Inc | $32.0M | 1.2% | −30.8% |
| BIIBBiogen Inc | $30.9M | 1.2% | +20.6% |
| VECOVeeco Instrs Inc Del | $30.4M | 1.1% | +58.5% |
Best picks still held
How each current holding has done since the quarter it first appeared in its filings (up to six years back).
| Stock | Held since | Return since | Now worth |
|---|---|---|---|
| ENVAEnova Intl Inc | September 30, 2020 | +1368.8% | $47.9M |
| MODModine Mfg Co | December 31, 2022 | +1244.5% | $83.8M |
| TTMITtm Technologies Inc | March 31, 2024 | +1095.0% | $95.0M |
| Flex LtdCUSIP Y2573F102 | September 30, 2022 | +872.8% | $37.1M |
| CLSCelestica Inc | June 30, 2024 | +536.3% | $46.3M |
| SMTCSemtech Corp | March 31, 2024 | +488.8% | $47.7M |
| POWLPowell Inds Inc | December 31, 2024 | +287.6% | $41.7M |
| WRBYWarby Parker Inc | March 31, 2023 | +186.5% | $25.6M |
| SEZLSezzle Inc | December 31, 2025 | +170.4% | $23.3M |
| ZETAZeta Global Holdings Corp | September 30, 2023 | +135.7% | $29.6M |
Sold off last quarter
- PBFPbf Energy Inc was $38.1M
- CRGYCrescent Energy Company was $35.1M
- CNRCore Natural Resources Inc was $24.8M
- MUSAMurphy Usa Inc was $23.8M
- CRCLCircle Internet Group Inc was $20.4M
- PRIMPrimoris Svcs Corp was $18.7M
- UPWKUpwork Inc was $17.2M
- RPAYRepay Hldgs Corp was $7.4M
- ACLSAxcelis Technologies Inc was $7.2M
- VNETVnet Group Inc was $6.9M
Quarter by quarter
| Quarter | Its picks | S&P 500 |
|---|---|---|
| June 30, 2026 | +27.2% | +14.8% |
| March 31, 2026 | +0.1% | −4.6% |
| December 31, 2025 | +0.2% | +2.4% |
| September 30, 2025 | +18.8% | +7.8% |
| June 30, 2025 | +18.2% | +10.5% |
| March 31, 2025 | −16.2% | −4.6% |
| December 31, 2024 | +4.5% | +2.1% |
| September 30, 2024 | +7.3% | +5.4% |
| June 30, 2024 | −0.6% | +4.0% |
| March 31, 2024 | +10.8% | +10.0% |
| December 31, 2023 | +10.4% | +11.2% |
| September 30, 2023 | −6.4% | −3.6% |
| June 30, 2023 | +14.2% | +8.3% |
| March 31, 2023 | +10.4% | +7.0% |
| December 31, 2022 | +6.4% | +7.1% |
| September 30, 2022 | −3.9% | −5.3% |
| June 30, 2022 | −22.8% | −16.5% |
| March 31, 2022 | −16.5% | −4.9% |
| December 31, 2021 | +5.4% | +10.7% |
| September 30, 2021 | −5.0% | +0.3% |
Sources
Every number on this page points here. Each one links to the public record.
- 1SEC EDGAR: Portolan Capital Management, LLC Form 13F filingshttps://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1350290&type=13F-HR&dateb=&owner=include&count=40CIK 1350290
- 2SEC: 13F for the quarter ended June 30, 2026https://www.sec.gov/Archives/edgar/data/1350290/000110465926096980/Filed August 14, 2026 · accession 0001104659-26-096980