SR
Shannon River Fund Management LLC 13F Filing (Q2 2026) — Top Positions & Stock Picks
Shannon River Fund Management LLCCIK: 0001301050
High-turnover traderSector-focusedMomentum follower
Total reported value
$1.1B
Reporting period: 2026-06-30 · Number of holdings: 37
Shannon River Fund Management LLC disclosed 37 holdings in its latest 13F filing for the period ending 2026-06-30, with total reported value of $1.1B and a quarterly turnover rate of 116.2%.
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Personality snowflake
- Concentration
- 15.66
- Portfolio Stability
- 100
- Momentum
- 100
- Sector conviction
- 100
- Diversification
- 74
- Sizing Uniformity
- 93.21
Shannon River Fund Management LLC's disclosed holdings carry a Herfindahl concentration index of 0.039 — mathematically equivalent to about 26 equally-sized positions, close to its 37 actual disclosed holdings. Value is spread relatively evenly across the portfolio rather than concentrated in a handful of names.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.68), 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.
Source and citation information
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Recent moves
View source Form 13F filing on SEC.govSold out MRVL
Trim TSEM
-24.1% $11.3M
New buy AMD
Trim LYV
-26.6% -$5.3M
New buy KLIC
Sold out AXON
Holdings Map
New buyAddUnchangedTrim
Top 10 holdings by weight
Full holdings list this quarter
| # | Ticker | Issuer | Asset Subclass | Weight | Weight Change | Shares Change | 4Q Trend |
|---|---|---|---|---|---|---|---|
| 1 | TSEM | Tower Semiconductor Ltd. | Stock-Tech | 8.91% | -7.97% | -24.06% | |
| 2 | FLEX | Flex Ltd. | Stock-Tech | 5.49% | +1.60% | +22.05% | |
| 3 | AMD | Advanced Micro Devices | Stock-Tech | 5.48% | +5.48% | NEW | |
| 4 | IDCC | Interdigital Inc | Stock-Tech | 4.66% | +1.54% | +240.80% | |
| 5 | CLS | Celestica Inc | Stock-Tech | 4.56% | +1.68% | +161.64% | |
| 6 | COHR | Coherent CORP | Stock-Tech | 4.55% | +0.55% | +47.07% | |
| 7 | HNGE | Hinge Health Inc-a | Stock-Other | 4.16% | +1.09% | +34.53% | |
| 8 | EXTR | Extreme Networks Inc | Stock-Other | 4.11% | +0.33% | +8.46% | |
| 9 | KLIC | Kulicke & Soffa Industries | Stock-Tech | 4.00% | +4.00% | NEW | |
| 10 | TWLO | Twilio Inc - A | Stock-Tech | 3.71% | +3.71% | NEW | |
| 11 | CIEN | Ciena CORP | Stock-Tech | 3.56% | +3.56% | NEW | |
| 12 | LYV | Live Nation Entertainment In | Stock-Comm Services | 3.53% | -5.04% | -26.62% | |
| 13 | RMBS | Rambus Inc | Stock-Tech | 3.46% | -2.02% | -12.61% | |
| 14 | ✓ | Stock-Other | 3.42% | +3.42% | NEW | ||
| 15 | UTI | Universal Technical Institut | Stock-Other | 3.40% | +3.40% | NEW | |
| 16 | ABNB | Airbnb Inc-class A | Stock-Consumer Disc | 3.17% | -2.78% | +0.34% | |
| 17 | TTWO | Take-two Interactive Softwre | Stock-Comm Services | 3.08% | +3.08% | NEW | |
| 18 | OUST | Ouster Inc | Stock-Other | 2.51% | +2.51% | NEW | |
| 19 | PDFS | Pdf Solutions Inc | Stock-Other | 2.34% | +2.34% | NEW | |
| 20 | NOK | Nokia Corp-spon Adr | Stock-Tech | 2.26% | +2.26% | NEW | |
| 21 | ALNT | Allient Inc | Stock-Other | 2.02% | +2.02% | NEW | |
| 22 | RKLB | Rocket Lab CORP | Stock-Industrials | 2.01% | +2.01% | NEW | |
| 23 | FFIV | F5 Inc | Stock-Tech | 1.90% | -0.87% | +2.12% | |
| 24 | DY | Dycom Industries Inc | Stock-Industrials | 1.78% | +1.78% | NEW | |
| 25 | CIFR | Cipher Digital Inc | Stock-Tech | 1.46% | +1.46% | NEW | |
| 26 | LION | Lionsgate Studios CORP | Stock-Other | 1.44% | -0.46% | +0.91% | |
| 27 | DLR | Digital Realty Trust Inc | Stock-Real Estate | 1.42% | +0.39% | +197.49% | |
| 28 | GWRE | Guidewire Software Inc | Stock-Tech | 1.24% | -0.55% | +80.12% | |
| 29 | SPHR | Sphere Entertainment Co | Stock-Comm Services | 1.14% | -0.50% | +0.73% | |
| 30 | GLBE | Global-E Online Ltd. | Stock-Other | 1.09% | +1.09% | NEW | |
| 31 | AMPX | Amprius Technologies Inc | Stock-Other | 1.04% | +1.04% | NEW | |
| 32 | APLD | Applied Digital CORP | Stock-Tech | 0.88% | +0.88% | NEW | |
| 33 | NET | Cloudflare Inc - Class A | Stock-Tech | 0.52% | +0.52% | NEW | |
| 34 | AMKR | Amkor Technology Inc | Stock-Tech | 0.51% | +0.51% | NEW | |
| 35 | MU | Micron Technology Inc | Stock-Tech | 0.46% | +0.46% | NEW | |
| 36 | BW | Babcock & Wilcox Enterpr | Stock-Other | 0.42% | +0.42% | NEW | |
| 37 | MXL | Maxlinear Inc | Stock-Other | 0.31% | +0.31% | NEW |
Portfolio Performance
Performance for Q3 2026
-5.8%
Performance Last 4 Quarters
+70.3%
- Stdev
- +30.3%
- Beta
- +1.8
- Alpha
- +6.4%
- Max Drawdown
- -20.3%
- Annualized Perf
- +45.6%
- Batting Avg vs S&P
- +66.7%
- Sortino
- +2.8
- Stutzer
- +0.41
- Treynor
- +0.24
- Sterling
- +1.81
- Calmar
- +2.24
- Information Ratio
- +1.02
- Tracking Error
- +22%
- Stdev Down
- +15.1%
- Winning Months %
- +77.8%
- Losing Months %
- +22.2%
- Best 12 Months
- +118%
- Worst 12 Months
- +9.8%
- Efficiency Ratio
- +0.84
- Sharpe
- +1.4
- Stdev Sectors
- +29.2%
- Skewness
- +0.18
- Kurtosis
- +1
- Upside Potential
- +4.15
Reported value over time
Sector allocation
Sector allocation over time
Quarterly history
| Period | Holdings | Total value | Stability | Top holdings | |
|---|---|---|---|---|---|
| 2026 Q2 | 37 | $1.1B | 100 | ||
| 2026 Q1 | 28 | $524.1M | 99 | ||
| 2025 Q4 | 26 | $637.5M | 99 | ||
| 2025 Q3 | 20 | $621.2M | 72 | ||
| 2025 Q2 | 24 | $752.0M | 0 | ||
| 2025 Q1 | 14 | $383.2M | 100 | ||
| 2024 Q4 | 19 | $677.6M | 0 | ||
| 2024 Q3 | 19 | $662.2M | 0 | ||
| 2024 Q2 | 22 | $620.5M | 0 | ||
| 2024 Q1 | 18 | $449.1M | 0 | ||
| 2023 Q4 | 24 | $547.3M | 0 | ||
| 2023 Q3 | 16 | $503.1M | 0 | ||
| 2023 Q2 | 15 | $400.9M | 0 | ||
| 2023 Q1 | 27 | $443.4M | 0 | ||
| 2022 Q4 | 30 | $407.8M | 0 | ||
| 2022 Q3 | 30 | $232.9M | 0 | ||
| 2022 Q2 | 35 | $352.0M | 0 | ||
| 2022 Q1 | 48 | $901.4M | 0 | ||
| 2021 Q4 | 45 | $985.9M | 0 | ||
| 2021 Q3 | 57 | $1.4B | 0 | ||
| 2021 Q2 | 57 | $1.4B | 73 | ||
| 2021 Q1 | 57 | $1.5B | 73 | ||
| 2020 Q4 | 46 | $1.1B | 68 | ||
| 2020 Q3 | 33 | $831.9M | 65 | ||
| 2020 Q2 | 33 | $764.1M | 84 | ||
| 2020 Q1 | 26 | $591.7M | 98 | ||
| 2019 Q4 | 27 | $749.3M | 68 | ||
| 2019 Q3 | 24 | $575.7M | 61 | ||
| 2019 Q2 | 31 | $629.3M | 90 | ||
| 2019 Q1 | 30 | $573.0M | 100 | ||
| 2018 Q4 | 28 | $352.2M | 100 | ||
| 2018 Q3 | 23 | $627.3M | 59 | ||
| 2018 Q2 | 33 | $760.1M | 100 | ||
| 2018 Q1 | 31 | $398.9M | 100 | ||
| 2017 Q4 | 30 | $416.6M | 97 | ||
| 2017 Q3 | 30 | $305.6M | 54 | ||
| 2017 Q2 | 31 | $340.2M | 85 | ||
| 2017 Q1 | 28 | $290.3M | 96 | ||
| 2016 Q4 | 35 | $321.2M | 84 | ||
| 2016 Q3 | 29 | $359.0M | 91 | ||
| 2016 Q2 | 33 | $399.9M | 76 | ||
| 2016 Q1 | 30 | $392.6M | 78 | ||
| 2015 Q4 | 30 | $515.6M | 64 | ||
| 2015 Q3 | 31 | $538.2M | 77 | ||
| 2015 Q2 | 37 | $1.0B | 79 | ||
| 2015 Q1 | 41 | $871.2M | 71 | ||
| 2014 Q4 | 39 | $983.9M | 66 | ||
| 2014 Q3 | 48 | $1.3B | 94 | ||
| 2014 Q2 | 59 | $1.9B | 73 | ||
| 2014 Q1 | 56 | $1.6B | 66 | ||
| 2013 Q4 | 56 | $1.3B | 91 | ||
| 2013 Q3 | 56 | $1.5B | 98 | ||
| 2013 Q2 | 48 | $836.5M | — |
Holding changes this quarter
Shannon River Fund Management LLC's most significant position changes for 2026-06-30: New buy: Advanced Micro Devices (AMD); Sold out: Marvell Technology Inc (MRVL); New buy: Kulicke & Soffa Industries (KLIC); New buy: Twilio Inc - A (TWLO); New buy: Ciena CORP (CIEN).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | AMD | Advanced Micro Devices | +5.5% | NEW | New buy |
| 2 | KLIC | Kulicke & Soffa Industries | +4% | NEW | New buy |
| 3 | TWLO | Twilio Inc - A | +3.7% | NEW | New buy |
| 4 | CIEN | Ciena CORP | +3.6% | NEW | New buy |
| 5 | ✓ | +3.4% | NEW | New buy | |
| 6 | UTI | Universal Technical Institut | +3.4% | NEW | New buy |
| 7 | TTWO | Take-two Interactive Softwre | +3.1% | NEW | New buy |
| 8 | OUST | Ouster Inc | +2.5% | NEW | New buy |
| 9 | PDFS | Pdf Solutions Inc | +2.3% | NEW | New buy |
| 10 | NOK | Nokia Corp-spon Adr | +2.3% | NEW | New buy |
| 11 | ALNT | Allient Inc | +2% | NEW | New buy |
| 12 | RKLB | Rocket Lab CORP | +2% | NEW | New buy |
| 13 | DY | Dycom Industries Inc | +1.8% | NEW | New buy |
| 14 | CLS | Celestica Inc | +1.7% | +161.64% | Add |
| 15 | FLEX | Flex Ltd. | +1.6% | +22.05% | Add |
| 16 | IDCC | Interdigital Inc | +1.5% | +240.80% | Add |
| 17 | CIFR | Cipher Digital Inc | +1.5% | NEW | New buy |
| 18 | HNGE | Hinge Health Inc-a | +1.1% | +34.53% | Add |
| 19 | GLBE | Global-E Online Ltd. | +1.1% | NEW | New buy |
| 20 | AMPX | Amprius Technologies Inc | +1% | NEW | New buy |
| 21 | APLD | Applied Digital CORP | +0.9% | NEW | New buy |
| 22 | COHR | Coherent CORP | +0.6% | +47.07% | Add |
| 23 | NET | Cloudflare Inc - Class A | +0.5% | NEW | New buy |
| 24 | AMKR | Amkor Technology Inc | +0.5% | NEW | New buy |
| 25 | MU | Micron Technology Inc | +0.5% | NEW | New buy |
| 26 | BW | Babcock & Wilcox Enterpr | +0.4% | NEW | New buy |
| 27 | DLR | Digital Realty Trust Inc | +0.4% | +197.49% | Add |
| 28 | EXTR | Extreme Networks Inc | +0.3% | +8.46% | Add |
| 29 | MXL | Maxlinear Inc | +0.3% | NEW | New buy |
| 30 | LION | Lionsgate Studios CORP | -0.5% | +0.91% | Add |
| 31 | SPHR | Sphere Entertainment Co | -0.5% | +0.73% | Add |
| 32 | GWRE | Guidewire Software Inc | -0.6% | +80.12% | Add |
| 33 | SNOW | Snowflake Inc | -0.8% | EXIT | Sold out |
| 34 | PLTR | Palantir Technologies Inc-a | -0.8% | EXIT | Sold out |
| 35 | FFIV | F5 Inc | -0.9% | +2.12% | Add |
| 36 | EQIX | Equinix Inc | -1% | EXIT | Sold out |
| 37 | OSIS | Osi Systems Inc | -1% | EXIT | Sold out |
| 38 | ALAB | Astera Labs Inc | -1% | EXIT | Sold out |
| 39 | APP | Applovin Corp-class A | -1.1% | EXIT | Sold out |
| 40 | AMBA | Ambarella, Inc. | -1.1% | EXIT | Sold out |
| 41 | UUUU | Energy Fuels Inc | -1.8% | EXIT | Sold out |
| 42 | RMBS | Rambus Inc | -2% | -12.61% | Trim |
| 43 | ABNB | Airbnb Inc-class A | -2.8% | +0.34% | Add |
| 44 | ADTN | Adtran Holdings Inc | -2.9% | EXIT | Sold out |
| 45 | LGN | Legence Corp-cl A | -3.6% | EXIT | Sold out |
| 46 | TOST | Toast Inc-class A | -3.7% | EXIT | Sold out |
| 47 | AXON | Axon Enterprise Inc | -3.8% | EXIT | Sold out |
| 48 | LYV | Live Nation Entertainment In | -5% | -26.62% | Trim |
| 49 | TSEM | Tower Semiconductor Ltd. | -8% | -24.06% | Trim |
| 50 | MRVL | Marvell Technology Inc | -10.7% | EXIT | Sold out |
Filing History
FAQ
What is Shannon River Fund Management LLC and what type of investor is it?
Shannon River Fund Management LLC is an investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2026-06-30), the firm manages a tracked equity portfolio valued at approximately $1.1B, spread across 37 disclosed positions.
What are Shannon River Fund Management LLC's largest equity positions?
Based on the latest 13F filing, Shannon River Fund Management LLC's top holdings by market value are:
1. Tower Semiconductor Ltd. (TSEM) — $99.8M (8.9%)
2. Flex Ltd. (FLEX) — $61.6M (5.5%)
3. Advanced Micro Devices (AMD) — $61.4M (5.5%)
4. Interdigital Inc (IDCC) — $52.2M (4.7%)
5. Celestica Inc (CLS) — $51.1M (4.6%)
What changes did Shannon River Fund Management LLC make in its most recent portfolio filing?
In the latest reported quarter, Shannon River Fund Management LLC made 50 notable position adjustments: 22 new positions were initiated, 12 existing holdings were added to, 3 positions were partially reduced, and 13 were completely exited. The largest of these moves: New buy: Advanced Micro Devices (AMD); Sold out: Marvell Technology Inc (MRVL); New buy: Kulicke & Soffa Industries (KLIC); New buy: Twilio Inc - A (TWLO); New buy: Ciena CORP (CIEN)
What sectors does Shannon River Fund Management LLC focus on?
Shannon River Fund Management LLC is concentrated in the following sectors based on its current disclosed equity portfolio:
• Information Technology: 78.1%
• Communication Services: 10.5%
• Industrials: 5.1%
• Consumer Discretionary: 4.3%
• Real Estate: 1.9%
Investment Profile
Shannon River Fund Management LLC returned an annualized 45.6% over the trailing 36 months — outperforming the S&P 500 by 6.4 points — based on a reconstructed track record of its disclosed 13F positions, with a beta of 1.80 (more volatile than the market) and a 67% quarterly batting average against the index.
Its portfolio is broadly diversified and fast-trading, with 78.1% of the portfolio concentrated in Information Technology.
Its turnover score has risen from 0 to 100 over the past 4 quarters — a shift toward more active trading.
It has added to its FLEX position for two straight quarters, increasing it by $42.6M to reach $61.6M.
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Developer Access
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