1y return+67.7%S&P 500 +20.9%
3y return+195.5%S&P 500 +68.5%
5y return+197.8%S&P 500 +74.5%
10y return+1053.3%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: $1,153 against $357 in the S&P 500.2
Shannon River Fund 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 |
|---|---|---|---|
| Tower Semiconductor LtdCUSIP M87915274 | $99.8M | 8.9% | −24.1% |
| Flex LtdCUSIP Y2573F102 | $61.6M | 5.5% | +22.0% |
| AMDAdvanced Micro Devices Inc | $61.4M | 5.5% | New |
| IDCCInterdigital Inc | $52.2M | 4.7% | +240.8% |
| CLSCelestica Inc | $51.1M | 4.6% | +161.6% |
| COHRCoherent Corp | $51.0M | 4.6% | +47.1% |
| HNGEHinge Health Inc | $46.6M | 4.2% | +34.5% |
| EXTRExtreme Networks Inc | $46.1M | 4.1% | +8.5% |
| KLICKulicke & Soffa Inds Inc | $44.8M | 4.0% | New |
| TWLOTwilio Inc | $41.5M | 3.7% | New |
| CIENCiena Corp | $39.9M | 3.6% | New |
| LYVLive Nation Entertainment In | $39.6M | 3.5% | −26.6% |
| RMBSRambus Inc Del | $38.7M | 3.5% | −12.6% |
| QNTQuantinuum Inc | $38.4M | 3.4% | New |
| UTIUniversal Technical Inst Inc | $38.1M | 3.4% | New |
| ABNBAirbnb Inc | $35.5M | 3.2% | |
| TTWOTake-two Interactive Softwar | $34.5M | 3.1% | New |
| OUSTOuster Inc | $28.1M | 2.5% | New |
| PDFSPdf Solutions Inc | $26.2M | 2.3% | New |
| NOKNokia Corp | $25.3M | 2.3% | New |
| ALNTAllient Inc | $22.7M | 2.0% | New |
| RKLBRocket Lab Corp | $22.5M | 2.0% | New |
| FFIVF5 Inc | $21.3M | 1.9% | +2.1% |
| DYDycom Inds Inc | $20.0M | 1.8% | New |
| CIFRCipher Digital Inc | $16.4M | 1.5% | New |
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 |
|---|---|---|---|
| Flex LtdCUSIP Y2573F102 | June 30, 2020 | +1481.2% | $61.6M |
| Tower Semiconductor LtdCUSIP M87915274 | December 31, 2023 | +754.0% | $99.8M |
| IDCCInterdigital Inc | December 31, 2022 | +472.2% | $52.2M |
| COHRCoherent Corp | June 30, 2025 | +342.2% | $51.0M |
| EXTRExtreme Networks Inc | December 31, 2025 | +94.4% | $46.1M |
| HNGEHinge Health Inc | December 31, 2025 | +78.7% | $46.6M |
| LIONLionsgate Studios Corp | March 31, 2026 | +59.6% | $16.1M |
| RMBSRambus Inc Del | March 31, 2026 | +54.3% | $38.7M |
| SPHRSphere Entertainment Co | March 31, 2026 | +47.4% | $12.8M |
| FFIVF5 Inc | March 31, 2026 | +43.8% | $21.3M |
Sold off last quarter
- MRVLMarvell Technology Inc was $55.8M
- AXONAxon Enterprise Inc was $20.1M
- TOSTToast Inc was $19.4M
- LGNLegence Corp was $19.1M
- ADTNAdtran Holdings Inc was $15.3M
- UUUUEnergy Fuels Inc was $9.3M
- Ambarella IncCUSIP G037AX101 was $5.9M
- APPApplovin Corp was $5.8M
- ALABAstera Labs Inc was $5.2M
- OSISOsi Systems Inc was $5.1M
Quarter by quarter
| Quarter | Its picks | S&P 500 |
|---|---|---|
| June 30, 2026 | +42.9% | +14.8% |
| March 31, 2026 | −8.3% | −4.6% |
| December 31, 2025 | +7.5% | +2.4% |
| September 30, 2025 | +19.1% | +7.8% |
| June 30, 2025 | +20.1% | +10.5% |
| March 31, 2025 | −18.3% | −4.6% |
| December 31, 2024 | +18.6% | +2.1% |
| September 30, 2024 | +8.9% | +5.4% |
| June 30, 2024 | +5.7% | +4.0% |
| March 31, 2024 | +14.2% | +10.0% |
| December 31, 2023 | +25.2% | +11.2% |
| September 30, 2023 | −8.0% | −3.6% |
| June 30, 2023 | +16.7% | +8.3% |
| March 31, 2023 | +20.7% | +7.0% |
| December 31, 2022 | +7.9% | +7.1% |
| September 30, 2022 | −0.5% | −5.3% |
| June 30, 2022 | −26.4% | −16.5% |
| March 31, 2022 | −10.9% | −4.9% |
| December 31, 2021 | −2.0% | +10.7% |
| September 30, 2021 | +3.6% | +0.3% |
Sources
Every number on this page points here. Each one links to the public record.
- 1SEC EDGAR: Shannon River Fund Management LLC Form 13F filingshttps://www.sec.gov/cgi-bin/browse-edgar?action=getcompany&CIK=1301050&type=13F-HR&dateb=&owner=include&count=40CIK 1301050
- 2SEC: 13F for the quarter ended June 30, 2026https://www.sec.gov/Archives/edgar/data/1301050/000101359426000886/Filed August 13, 2026 · accession 0001013594-26-000886