Shannon River Fund Management LLC
In its 13F for Q2 2026 (holdings as of June 30, 2026, filed August 13, 2026), Shannon River Fund Management LLC reported 37 stock positions worth $1.1 billion. Its top holding was Tower Semiconductor (TSEM) at 8.9% of the portfolio, followed by Flex (FLEX, 5.5%) and Advanced Micro Devices (AMD, 5.5%). Compared with Q1 2026, it opened 22 new positions, sold out of 13, added to 12 and reduced 3. The biggest buy was a new position in Advanced Micro Devices (AMD) and the biggest sale an exit from Marvell Technology (MRVL).
- Most Recent 13F
- Q2 2026
- Location
- NEW YORK, NY
- CIK
- 0001301050
- Portfolio Value
- $1.1B (Q2 2026)
- SEC Filing
- 0001013594-26-000886 ↗ filed Aug 13, 2026
Holdings Value
Holdings 37 stocks · $1.1B
| TSEM Tower Semiconductor Ltd. | 8.91% | 382,933 | $99.8M | Reduce -24.1% |
| FLEX Flex Ltd. | 5.49% | 379,834 | $61.6M | Add +22.1% |
| AMD Advanced Micro Devices | 5.48% | 105,751 | $61.4M | New |
| IDCC Interdigital Inc. | 4.66% | 184,388 | $52.2M | Add +240.8% |
| CLS Celestica Inc. | 4.56% | 139,964 | $51.1M | Add +161.6% |
| COHR Coherent Corp. | 4.55% | 129,283 | $51.0M | Add +47.1% |
| HNGE Hinge Health Inc. Class A | 4.16% | 561,224 | $46.6M | Add +34.5% |
| EXTR Extreme Networks Inc. | 4.11% | 1,424,095 | $46.1M | Add +8.5% |
| KLIC Kulicke & Soffa Industries | 4.00% | 334,781 | $44.8M | New |
| TWLO Twilio Inc. Class A | 3.71% | 201,352 | $41.5M | New |
| CIEN Ciena Corp. | 3.56% | 81,298 | $39.9M | New |
| LYV Live Nation Entertainment Inc. | 3.53% | 216,037 | $39.6M | Reduce -26.6% |
| RMBS Rambus Inc. | 3.46% | 291,713 | $38.7M | Reduce -12.6% |
| QNT Quantinuum Inc. Class A | 3.42% | 469,355 | $38.4M | New |
| UTI Universal Technical Institut | 3.40% | 890,113 | $38.1M | New |
| ABNB Airbnb Inc. Class A | 3.17% | 247,836 | $35.5M | Add +0.3% |
| TTWO Take-Two Interactive Softwre | 3.08% | 138,029 | $34.5M | New |
| OUST Ouster Inc. | 2.51% | 449,264 | $28.1M | New |
| PDFS PDF Solutions Inc. | 2.34% | 369,776 | $26.2M | New |
| NOK Nokia Corp.-Spon ADR | 2.26% | 1,906,902 | $25.3M | New |
| ALNT Allient Inc. | 2.02% | 220,237 | $22.7M | New |
| RKLB Rocket Lab Corp. | 2.01% | 221,143 | $22.5M | New |
| FFIV F5 Inc. | 1.90% | 51,258 | $21.3M | Add +2.1% |
| DY Dycom Industries Inc. | 1.78% | 39,473 | $20.0M | New |
| CIFR Cipher Digital Inc. | 1.46% | 667,931 | $16.4M | New |
| LION Lionsgate Studios Corp. | 1.44% | 1,050,445 | $16.1M | Add +0.9% |
| DLR Digital Realty Trust Inc. | 1.42% | 88,764 | $15.9M | Add +197.5% |
| GWRE Guidewire Software Inc. | 1.24% | 113,230 | $13.9M | Add +80.1% |
| SPHR Sphere Entertainment Co. | 1.14% | 73,878 | $12.8M | Add +0.7% |
| GLBE Global-E Online Ltd. | 1.09% | 353,200 | $12.3M | New |
| AMPX Amprius Technologies Inc. | 1.04% | 838,887 | $11.6M | New |
| APLD Applied Digital Corp. | 0.88% | 265,474 | $9.9M | New |
| NET Cloudflare Inc. Class A | 0.52% | 23,589 | $5.8M | New |
| AMKR Amkor Technology Inc. | 0.51% | 65,895 | $5.7M | New |
| MU Micron Technology Inc. | 0.46% | 4,484 | $5.2M | New |
| BW Babcock & Wilcox Enterpr | 0.42% | 333,153 | $4.7M | New |
| MXL Maxlinear Inc. | 0.31% | 27,377 | $3.5M | New |
Portfolio Sells Q1 2026 → Q2 2026
| MRVL Marvell Technology Inc. | Sold out | 0.00% | −10.65 |
| TSEM Tower Semiconductor Ltd. | Reduce -24.1% | 8.91% | −7.98 |
| LYV Live Nation Entertainment Inc. | Reduce -26.6% | 3.53% | −5.04 |
| AXON Axon Enterprise Inc. | Sold out | 0.00% | −3.84 |
| TOST Toast Inc. Class A | Sold out | 0.00% | −3.70 |
| LGN Legence Corp. Class A | Sold out | 0.00% | −3.64 |
| ADTN Adtran Holdings Inc. | Sold out | 0.00% | −2.93 |
| RMBS Rambus Inc. | Reduce -12.6% | 3.46% | −2.02 |
| UUUU Energy Fuels Inc. | Sold out | 0.00% | −1.77 |
| AMBA Ambarella Inc. | Sold out | 0.00% | −1.13 |
| APP AppLovin Corp. Class A | Sold out | 0.00% | −1.10 |
| ALAB Astera Labs Inc. | Sold out | 0.00% | −0.99 |
| OSIS Osi Systems Inc. | Sold out | 0.00% | −0.98 |
| EQIX Equinix Inc. | Sold out | 0.00% | −0.95 |
| PLTR Palantir Technologies Inc. Class A | Sold out | 0.00% | −0.81 |
| SNOW Snowflake Inc. | Sold out | 0.00% | −0.76 |
Portfolio Buys Q1 2026 → Q2 2026
| AMD Advanced Micro Devices | New | 5.48% | +5.48 |
| KLIC Kulicke & Soffa Industries | New | 4.00% | +4.00 |
| TWLO Twilio Inc. Class A | New | 3.71% | +3.71 |
| CIEN Ciena Corp. | New | 3.56% | +3.56 |
| QNT Quantinuum Inc. Class A | New | 3.42% | +3.42 |
| UTI Universal Technical Institut | New | 3.40% | +3.40 |
| TTWO Take-Two Interactive Softwre | New | 3.08% | +3.08 |
| OUST Ouster Inc. | New | 2.51% | +2.51 |
| PDFS PDF Solutions Inc. | New | 2.34% | +2.34 |
| NOK Nokia Corp.-Spon ADR | New | 2.26% | +2.26 |
| ALNT Allient Inc. | New | 2.02% | +2.02 |
| RKLB Rocket Lab Corp. | New | 2.01% | +2.01 |
| DY Dycom Industries Inc. | New | 1.78% | +1.78 |
| CLS Celestica Inc. | Add +161.6% | 4.56% | +1.68 |
| FLEX Flex Ltd. | Add +22.1% | 5.49% | +1.61 |
| IDCC Interdigital Inc. | Add +240.8% | 4.66% | +1.54 |
| CIFR Cipher Digital Inc. | New | 1.46% | +1.46 |
| GLBE Global-E Online Ltd. | New | 1.09% | +1.09 |
| HNGE Hinge Health Inc. Class A | Add +34.5% | 4.16% | +1.09 |
| AMPX Amprius Technologies Inc. | New | 1.04% | +1.04 |
| APLD Applied Digital Corp. | New | 0.88% | +0.88 |
| COHR Coherent Corp. | Add +47.1% | 4.55% | +0.56 |
| NET Cloudflare Inc. Class A | New | 0.52% | +0.52 |
| AMKR Amkor Technology Inc. | New | 0.51% | +0.51 |
| MU Micron Technology Inc. | New | 0.46% | +0.46 |
| BW Babcock & Wilcox Enterpr | New | 0.42% | +0.42 |
| DLR Digital Realty Trust Inc. | Add +197.5% | 1.42% | +0.40 |
| EXTR Extreme Networks Inc. | Add +8.5% | 4.11% | +0.34 |
| MXL Maxlinear Inc. | New | 0.31% | +0.31 |
| LION Lionsgate Studios Corp. | Add +0.9% | 1.44% | −0.47 |
| SPHR Sphere Entertainment Co. | Add +0.7% | 1.14% | −0.50 |
| GWRE Guidewire Software Inc. | Add +80.1% | 1.24% | −0.55 |
| FFIV F5 Inc. | Add +2.1% | 1.90% | −0.87 |
| ABNB Airbnb Inc. Class A | Add +0.3% | 3.17% | −2.79 |
All Filings
| Quarter | Positions | 13F Reported Value | Top Holdings |
|---|---|---|---|
| Q2 2026 | 37 | $1.1B | TSEM, FLEX, AMD, IDCC, CLS |
| Q1 2026 | 28 | $524.1M | TSEM, MRVL, LYV, ABNB, RMBS |
| Q4 2025 | 26 | $637.5M | TSEM, PEGA, U, LYV, MRVL |
| Q3 2025 | 20 | $621.2M | PEGA, TSEM, IDCC, WIX, FLEX |
| Q2 2025 | 22 | $649.3M | PEGA, FLEX, TSEM, MRVL, IDCC |
| Q1 2025 | 14 | $383.2M | IDCC, PEGA, TSEM, CWAN, FLEX |
| Q4 2024 | 17 | $565.7M | PEGA, IDCC, MRVL, WIX LTD (WIX 0 08/15/25), TSEM |
| Q3 2024 | 18 | $661.7M | IDCC, CWAN, TSEM, PEGA, MRVL |
| Q2 2024 | 21 | $581.4M | TSEM, CGNX, IDCC, NVDA, WIX |
| Q1 2024 | 18 | $449.1M | TSEM, WIX, CGNX, NVDA, IDCC |