Shannon River Fund Management LLC reported 37 positions worth $1.12B for the quarter ended Jun 30, 2026, up 113.8% on the prior quarter. It opened 22 new positions, added to 12, trimmed 3 and exited 13. Its largest holding is Tower Semiconductor Ltd at 8.9% of the portfolio.
Reported 13F market value at each quarter end. A change mixes trading with price moves in the positions held.
Dollar value of shares bought and sold each quarter, at that quarter’s price. It counts trading only, not price changes.
How many positions were opened, added to, trimmed or closed each quarter.
Share of reported value in each sector at every quarter end.
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| AMD Advanced Micro Devices Inc | +105.8K | – | $61.43M | 5.48% |
| KLIC Kulicke & Soffa Industries Inc | +334.8K | – | $44.78M | 4% |
| TWLO Twilio Inc | +201.4K | – | $41.54M | 3.71% |
| CIEN Ciena Corp | +81.3K | – | $39.88M | 3.56% |
| QNT Quantinuum Inc. | +469.4K | – | $38.37M | 3.42% |
| UTI Universal Technical Institute Inc | +890.1K | – | $38.07M | 3.4% |
| IDCC InterDigital, Inc. | +130.3K | +240.8% | $36.89M | 4.66% |
| TTWO Take Two Interactive Software Inc | +138.0K | – | $34.50M | 3.08% |
| CLS Celestica Inc | +86.5K | +161.6% | $31.54M | 4.56% |
| OUST Ouster, Inc. | +449.3K | – | $28.09M | 2.51% |
| Holding | Change | Change % | Trade Value | Weight |
|---|---|---|---|---|
| MRVL Marvell Technology, Inc. | -563.6K | -100.0% | $55.82M | Exited |
| TSEM Tower Semiconductor Ltd | -121.3K | -24.1% | $31.62M | 8.91% |
| AXON Axon Enterprise, Inc. | -47.4K | -100.0% | $20.15M | Exited |
| TOST Toast, Inc. | -732.0K | -100.0% | $19.41M | Exited |
| LGN Legence Corp. | -337.6K | -100.0% | $19.06M | Exited |
| ADTN ADTRAN Holdings, Inc. | -1.22M | -100.0% | $15.35M | Exited |
| LYV Live Nation Entertainment, Inc. | -78.4K | -26.6% | $14.35M | 3.53% |
| UUUU Energy Fuels Inc | -507.6K | -100.0% | $9.26M | Exited |
| AMBA Ambarella Inc | -114.9K | -100.0% | $5.92M | Exited |
| APP AppLovin Corp | -14.5K | -100.0% | $5.76M | Exited |
| Holding | Shares | Trade Value | Weight |
|---|---|---|---|
| AMD Advanced Micro Devices Inc | +105.8K | $61.43M | 5.48% |
| KLIC Kulicke & Soffa Industries Inc | +334.8K | $44.78M | 4% |
| TWLO Twilio Inc | +201.4K | $41.54M | 3.71% |
| CIEN Ciena Corp | +81.3K | $39.88M | 3.56% |
| QNT Quantinuum Inc. | +469.4K | $38.37M | 3.42% |
| UTI Universal Technical Institute Inc | +890.1K | $38.07M | 3.4% |
| TTWO Take Two Interactive Software Inc | +138.0K | $34.50M | 3.08% |
| OUST Ouster, Inc. | +449.3K | $28.09M | 2.51% |
| PDFS Pdf Solutions Inc | +369.8K | $26.18M | 2.34% |
| NOK Nokia Corp | +1.91M | $25.32M | 2.26% |
| Holding | Shares Sold | Trade Value | Prior Weight |
|---|---|---|---|
| MRVL Marvell Technology, Inc. | -563.6K | $55.82M | 10.65% |
| AXON Axon Enterprise, Inc. | -47.4K | $20.15M | 3.84% |
| TOST Toast, Inc. | -732.0K | $19.41M | 3.7% |
| LGN Legence Corp. | -337.6K | $19.06M | 3.64% |
| ADTN ADTRAN Holdings, Inc. | -1.22M | $15.35M | 2.93% |
| UUUU Energy Fuels Inc | -507.6K | $9.26M | 1.77% |
| AMBA Ambarella Inc | -114.9K | $5.92M | 1.13% |
| APP AppLovin Corp | -14.5K | $5.76M | 1.1% |
| ALAB Astera Labs, Inc. | -47.4K | $5.19M | 0.991% |
| OSIS Osi Systems Inc | -19.3K | $5.12M | 0.976% |
| # | Activity | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | TSEM Tower Semiconductor Ltd | Technology | 382.9K | $99.81M | 8.91% | -121.3K | -24.1% | Reduced | 0.34% |
| 2 | FLEX Flex Ltd. | Technology | 379.8K | $61.56M | 5.49% | +68.6K | +22.0% | Added | 0.1% |
| 3 | AMD Advanced Micro Devices Inc | Technology | 105.8K | $61.43M | 5.48% | +105.8K | – | New | 0.01% |
| 4 | IDCC InterDigital, Inc. | Technology | 184.4K | $52.21M | 4.66% | +130.3K | +240.8% | Added | 0.71% |
| 5 | CLS Celestica Inc | Technology | 140.0K | $51.06M | 4.56% | +86.5K | +161.6% | Added | 0.12% |
| 6 | COHR Coherent Corp. | Technology | 129.3K | $51.00M | 4.55% | +41.4K | +47.1% | Added | 0.07% |
| 7 | HNGE Hinge Health, Inc. | Healthcare | 561.2K | $46.58M | 4.16% | +144.0K | +34.5% | Added | 0.9% |
| 8 | EXTR Extreme Networks Inc | Technology | 1.42M | $46.10M | 4.11% | +111.0K | +8.5% | Added | 1.07% |
| 9 | KLIC Kulicke & Soffa Industries Inc | Technology | 334.8K | $44.78M | 4% | +334.8K | – | New | 0.64% |
| 10 | TWLO Twilio Inc | Technology | 201.4K | $41.54M | 3.71% | +201.4K | – | New | 0.13% |
| 11 | CIEN Ciena Corp | Technology | 81.3K | $39.88M | 3.56% | +81.3K | – | New | 0.06% |
| 12 | LYV Live Nation Entertainment, Inc. | Communication Services | 216.0K | $39.56M | 3.53% | -78.4K | -26.6% | Reduced | 0.09% |
| 13 | RMBS Rambus Inc | Technology | 291.7K | $38.72M | 3.46% | -42.1K | -12.6% | Reduced | 0.27% |
| 14 | QNT Quantinuum Inc. | Technology | 469.4K | $38.37M | 3.42% | +469.4K | – | New | 0.18% |
| 15 | UTI Universal Technical Institute Inc | Consumer Discretionary | 890.1K | $38.07M | 3.4% | +890.1K | – | New | 1.62% |
Tip. Select a row to see that position’s full history at Shannon River Fund Management.
As of its Q2 2026 13F filing, Shannon River Fund Management LLC’s five largest positions were Tower Semiconductor Ltd (TSEM) at 8.9%, Flex Ltd. (FLEX) at 5.5%, Advanced Micro Devices Inc (AMD) at 5.5%, InterDigital, Inc. (IDCC) at 4.7%, Celestica Inc (CLS) at 4.6% of the reported portfolio.
Shannon River Fund Management LLC reported a 13F portfolio worth $1.12B across 37 positions for Q2 2026. That is up 113.8% from the previous quarter.
Its largest purchases by value were Advanced Micro Devices Inc ($61.43M), Kulicke & Soffa Industries Inc ($44.78M), Twilio Inc ($41.54M). It opened 22 new positions.
Its largest sales by value were Marvell Technology, Inc. ($55.82M), Tower Semiconductor Ltd ($31.62M), Axon Enterprise, Inc. ($20.15M). It exited 13 positions entirely.
From the Form 13F-HR reports Shannon River Fund Management LLC files with the SEC each quarter, within 45 days of quarter end. A 13F lists long positions in US-listed equities and options; it excludes short positions, cash, bonds and most non-US holdings.
13F data reflects long positions in US-listed equities and options as reported to the SEC up to 45 days after quarter end. It excludes short positions, cash, bonds and most non-US securities, so it is not a complete picture of a manager’s assets.