SR
Shannon River Fund Management LLC 13F Disclosure & Portfolio Data
Shannon River Fund Management LLCCIK: 0001301050
High-turnover traderSector-focusedMomentum follower
Total reported value
$524.1M
Reporting period: 2026-03-31 · Number of holdings: 28
Shannon River Fund Management LLC disclosed 28 holdings in its latest 13F filing for the period ending 2026-03-31, with total reported value of $524.1M and a quarterly turnover rate of 99.4%.
Browse other institutions with $100M to $1B AUMBrowse other institutions starting with "S"
Personality snowflake
- Concentration
- 27.54
- Portfolio Stability
- 99.4
- Momentum/Contrarian
- 100
- Sector conviction
- 100
- Diversification
- 56
- Sizing Uniformity
- 90.19
Shannon River Fund Management LLC's disclosed holdings carry a Herfindahl concentration index of 0.069 — mathematically equivalent to about 15 equally-sized positions, well below its 28 actual disclosed holdings. That gap points to a strategy built around a small core of high-conviction bets rather than broad diversification.
Position sizes are fairly uniform across the portfolio (a coefficient of variation of 0.98), 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.
Recent moves
Add TSEM
-16.4% $17.7M
Add MRVL
+49.2% $23.7M
Trim ALAB
-71.7% -$22.7M
Add LYV
+15.3% $8.5M
Trim AMBA
-61.8% -$15.4M
Trim GWRE
-50.1% -$15.9M
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 | 16.88% | +5.78% | -16.35% | |
| 2 | MRVL | Marvell Technology INC | Stock-Tech | 10.65% | +5.62% | +49.22% | |
| 3 | LYV | Live Nation Entertainment In | Stock-Comm Services | 8.57% | +2.86% | +15.25% | |
| 4 | ABNB | Airbnb Inc-class A | Stock-Consumer Disc | 5.95% | +5.95% | NEW | |
| 5 | RMBS | Rambus INC | Stock-Tech | 5.48% | +5.48% | NEW | |
| 6 | COHR | Coherent CORP | Stock-Tech | 4.00% | -0.86% | -47.65% | |
| 7 | FLEX | Flex Ltd. | Stock-Tech | 3.89% | +0.92% | -0.65% | |
| 8 | AXON | Axon Enterprise INC | Stock-Industrials | 3.84% | +1.99% | +129.01% | |
| 9 | EXTR | Extreme Networks INC | Stock-Other | 3.78% | -1.19% | -31.06% | |
| 10 | TOST | Toast Inc-class A | Stock-Tech | 3.70% | +3.70% | NEW | |
| 11 | LGN | Legence Corp-cl A | Stock-Other | 3.64% | +1.38% | +0.83% | |
| 12 | IDCC | Interdigital INC | Stock-Tech | 3.12% | +0.45% | +1.15% | |
| 13 | HNGE | Hinge Health Inc-a | Stock-Other | 3.07% | +1.37% | +78.78% | |
| 14 | ADTN | Adtran Holdings INC | Stock-Other | 2.93% | +2.93% | NEW | |
| 15 | CLS | Celestica INC | Stock-Tech | 2.88% | -2.09% | -50.07% | |
| 16 | FFIV | F5 INC | Stock-Tech | 2.77% | +2.77% | NEW | |
| 17 | LION | Lionsgate Studios CORP | Stock-Other | 1.90% | +1.90% | NEW | |
| 18 | GWRE | Guidewire Software INC | Stock-Tech | 1.79% | -2.18% | -50.13% | |
| 19 | UUUU | Energy Fuels INC | Stock-Energy | 1.77% | +1.77% | NEW | |
| 20 | SPHR | Sphere Entertainment Co | Stock-Comm Services | 1.64% | +1.64% | NEW | |
| 21 | AMBA | Ambarella, Inc. | Stock-Tech | 1.13% | -2.22% | -61.83% | |
| 22 | APP | Applovin Corp-class A | Stock-Tech | 1.10% | +1.10% | NEW | |
| 23 | DLR | Digital Realty Trust INC | Stock-Real Estate | 1.03% | +1.03% | NEW | |
| 24 | ALAB | Astera Labs INC | Stock-Tech | 0.99% | -3.38% | -71.73% | |
| 25 | OSIS | Osi Systems INC | Stock-Tech | 0.98% | +0.98% | NEW | |
| 26 | EQIX | Equinix INC | Stock-Real Estate | 0.95% | +0.95% | NEW | |
| 27 | PLTR | Palantir Technologies Inc-a | Stock-Tech | 0.81% | — | +0.64% | |
| 28 | SNOW | Snowflake INC | Stock-Tech | 0.76% | +0.76% | NEW |
Portfolio Performance
Performance for Q3 2026
+8.4%
Performance Last 4 Quarters
+51.2%
Based on 65% of reported portfolio value with available pricing
- Stdev
- +27.3%
- Beta
- +1.73
- Alpha
- +2%
- Max Drawdown
- -12.8%
- Annualized Perf
- +35.1%
- Batting Avg vs S&P
- +63.9%
- Sortino
- +2.74
- Stutzer
- +0.38
- Treynor
- +0.2
- Sterling
- +1.54
- Calmar
- +2.73
- Information Ratio
- +0.86
- Tracking Error
- +18%
- Stdev Down
- +12.4%
- Winning Months %
- +66.7%
- Losing Months %
- +33.3%
- Best 12 Months
- +82%
- Worst 12 Months
- +12.2%
- Efficiency Ratio
- +0.62
- Sharpe
- +1.24
- Stdev Sectors
- +25%
- Skewness
- +0.57
- Kurtosis
- +0.5
- Upside Potential
- +4.53
Reported value over time
Sector allocation
Sector allocation over time
Quarterly history
| Period | Holdings | Total value | Stability | Top holdings |
|---|---|---|---|---|
| 2026-03-31 | 28 | $524.1M | 99 | |
| 2025-12-31 | 26 | $637.5M | 99 | |
| 2025-09-30 | 20 | $621.2M | 72 | |
| 2025-06-30 | 24 | $752.0M | 0 | |
| 2025-03-31 | 14 | $383.2M | 100 | |
| 2024-12-31 | 19 | $677.6M | 0 | |
| 2024-09-30 | 19 | $714.7M | 0 | |
| 2024-06-30 | 22 | $620.5M | 0 | |
| 2024-03-31 | 18 | $449.1M | 0 | |
| 2023-12-31 | 24 | $547.3M | 0 | |
| 2023-09-30 | 16 | $503.1M | 0 | |
| 2023-06-30 | 15 | $400.9M | 0 | |
| 2023-03-31 | 27 | $443.4M | 0 | |
| 2022-12-31 | 30 | $407.8M | 0 | |
| 2022-09-30 | 30 | $232.9M | 0 | |
| 2022-06-30 | 35 | $352.0M | 0 | |
| 2022-03-31 | 48 | $901.4M | 0 | |
| 2021-12-31 | 45 | $985.9M | 0 | |
| 2021-09-30 | 57 | $1.4B | 0 | |
| 2021-06-30 | 57 | $1.4B | 73 | |
| 2021-03-31 | 57 | $1.5B | 73 | |
| 2020-12-31 | 46 | $1.1B | 68 | |
| 2020-09-30 | 33 | $831.9M | 65 | |
| 2020-06-30 | 33 | $764.1M | 84 | |
| 2020-03-31 | 26 | $591.7M | 98 | |
| 2019-12-31 | 27 | $749.3M | 68 | |
| 2019-09-30 | 24 | $575.7M | 61 | |
| 2019-06-30 | 31 | $629.3M | 90 | |
| 2019-03-31 | 30 | $573.0M | 100 | |
| 2018-12-31 | 28 | $352.2M | 100 | |
| 2018-09-30 | 23 | $627.3M | 59 | |
| 2018-06-30 | 33 | $760.1M | 100 | |
| 2018-03-31 | 31 | $398.9M | 100 | |
| 2017-12-31 | 30 | $416.6M | 97 | |
| 2017-09-30 | 30 | $305.6M | 54 | |
| 2017-06-30 | 31 | $340.2M | 85 | |
| 2017-03-31 | 28 | $290.3M | 96 | |
| 2016-12-31 | 35 | $321.2M | 84 | |
| 2016-09-30 | 29 | $359.0M | 91 | |
| 2016-06-30 | 33 | $399.9M | 76 | |
| 2016-03-31 | 30 | $392.6M | 78 | |
| 2015-12-31 | 30 | $515.6M | 64 | |
| 2015-09-30 | 31 | $538.2M | 77 | |
| 2015-06-30 | 37 | $1.0B | 79 | |
| 2015-03-31 | 41 | $871.2M | 71 | |
| 2014-12-31 | 39 | $983.9M | 66 | |
| 2014-09-30 | 48 | $1.3B | 94 | |
| 2014-06-30 | 59 | $1.9B | 73 | |
| 2014-03-31 | 56 | $1.6B | 66 | |
| 2013-12-31 | 56 | $1.3B | 91 | |
| 2013-09-30 | 56 | $1.5B | 98 | |
| 2013-06-30 | 48 | $836.5M | — |
Holding changes this quarter
Shannon River Fund Management LLC's most significant position changes for 2026-03-31: Sold out: Pegasystems INC (PEGA); Sold out: Unity Software INC (U); New buy: Airbnb Inc-class A (ABNB); Sold out: Clearwater Analytics Holdings, Inc. (CWAN); Sold out: Ncino INC (NCNO).
| # | Ticker | Issuer | Weight Change | Shares Change | Action |
|---|---|---|---|---|---|
| 1 | TSEM | Tower Semiconductor Ltd. | +5.8% | -16.35% | Trim |
| 2 | MRVL | Marvell Technology INC | +5.6% | +49.22% | Add |
| 3 | LYV | Live Nation Entertainment In | +2.9% | +15.25% | Add |
| 4 | AXON | Axon Enterprise INC | +2% | +129.01% | Add |
| 5 | LGN | Legence Corp-cl A | +1.4% | +0.83% | Add |
| 6 | HNGE | Hinge Health Inc-a | +1.4% | +78.78% | Add |
| 7 | FLEX | Flex Ltd. | +0.9% | -0.65% | Trim |
| 8 | IDCC | Interdigital INC | +0.5% | +1.15% | Add |
| 9 | PLTR | Palantir Technologies Inc-a | — | +0.64% | Add |
| 10 | COHR | Coherent CORP | -0.9% | -47.65% | Trim |
| 11 | EXTR | Extreme Networks INC | -1.2% | -31.06% | Trim |
| 12 | CLS | Celestica INC | -2.1% | -50.07% | Trim |
| 13 | GWRE | Guidewire Software INC | -2.2% | -50.13% | Trim |
| 14 | AMBA | Ambarella, Inc. | -2.2% | -61.83% | Trim |
| 15 | ALAB | Astera Labs INC | -3.4% | -71.73% | Trim |
| 16 | PEGA | Pegasystems INC | — | EXIT | Sold out |
| 17 | U | Unity Software INC | — | EXIT | Sold out |
| 18 | ABNB | Airbnb Inc-class A | — | NEW | New buy |
| 19 | CWAN | Clearwater Analytics Holdings, Inc. | — | EXIT | Sold out |
| 20 | NCNO | Ncino INC | — | EXIT | Sold out |
| 21 | RMBS | Rambus INC | — | NEW | New buy |
| 22 | KVYO | Klaviyo Inc-a | — | EXIT | Sold out |
| 23 | CRDO | Credo Technology Group Holding Ltd | — | EXIT | Sold out |
| 24 | TOST | Toast Inc-class A | — | NEW | New buy |
| 25 | ADTN | Adtran Holdings INC | — | NEW | New buy |
| 26 | FFIV | F5 INC | — | NEW | New buy |
| 27 | DOCU | Docusign INC | — | EXIT | Sold out |
| 28 | LION | Lionsgate Studios CORP | — | NEW | New buy |
| 29 | UUUU | Energy Fuels INC | — | NEW | New buy |
| 30 | SPHR | Sphere Entertainment Co | — | NEW | New buy |
| 31 | CCC | Ccc Intelligent Solutions Ho | — | EXIT | Sold out |
| 32 | QCOM | Qualcomm INC | — | EXIT | Sold out |
| 33 | MU | Micron Technology INC | — | EXIT | Sold out |
| 34 | APP | Applovin Corp-class A | — | NEW | New buy |
| 35 | DLR | Digital Realty Trust INC | — | NEW | New buy |
| 36 | OSIS | Osi Systems INC | — | NEW | New buy |
| 37 | EQIX | Equinix INC | — | NEW | New buy |
| 38 | WIX | Wix.com Ltd. | — | EXIT | Sold out |
| 39 | SNOW | Snowflake INC | — | NEW | New buy |
Filing History
| Period | Filed | Type | EDGAR |
|---|---|---|---|
| 2026-03-31 | 2026-05-14 | 13F-HR | View on EDGAR |
| 2025-12-31 | 2026-02-17 | 13F-HR | View on EDGAR |
| 2025-09-30 | 2025-11-13 | 13F-HR | View on EDGAR |
| 2025-06-30 | 2025-08-13 | 13F-HR | View on EDGAR |
| 2025-03-31 | 2025-05-14 | 13F-HR | View on EDGAR |
| 2024-12-31 | 2025-02-13 | 13F-HR | View on EDGAR |
| 2024-09-30 | 2024-11-13 | 13F-HR | View on EDGAR |
| 2024-06-30 | 2024-08-13 | 13F-HR | View on EDGAR |
| 2024-03-31 | 2024-05-14 | 13F-HR | View on EDGAR |
| 2023-12-31 | 2024-02-13 | 13F-HR | View on EDGAR |
| 2023-09-30 | 2023-11-13 | 13F-HR | View on EDGAR |
| 2023-06-30 | 2023-08-11 | 13F-HR | View on EDGAR |
| 2023-03-31 | 2023-05-12 | 13F-HR | View on EDGAR |
| 2022-12-31 | 2023-02-13 | 13F-HR | View on EDGAR |
| 2022-09-30 | 2022-11-14 | 13F-HR | View on EDGAR |
| 2022-06-30 | 2022-08-15 | 13F-HR | View on EDGAR |
| 2022-03-31 | 2022-07-20 | Amendment | View on EDGAR |
| 2022-03-31 | 2022-05-16 | 13F-HR | View on EDGAR |
| 2021-12-31 | 2022-02-14 | 13F-HR | View on EDGAR |
| 2021-09-30 | 2021-11-15 | 13F-HR | View on EDGAR |
| 2021-06-30 | 2021-08-16 | Amendment | View on EDGAR |
| 2021-06-30 | 2021-08-16 | 13F-HR | View on EDGAR |
| 2021-03-31 | 2021-05-17 | 13F-HR | View on EDGAR |
| 2020-12-31 | 2021-02-16 | 13F-HR | View on EDGAR |
| 2020-09-30 | 2020-11-16 | 13F-HR | View on EDGAR |
| 2020-06-30 | 2020-08-14 | 13F-HR | View on EDGAR |
| 2020-03-31 | 2020-05-15 | 13F-HR | View on EDGAR |
| 2019-12-31 | 2020-02-14 | 13F-HR | View on EDGAR |
| 2019-09-30 | 2020-02-14 | Amendment | View on EDGAR |
| 2019-09-30 | 2019-11-14 | 13F-HR | View on EDGAR |
| 2019-06-30 | 2020-02-14 | Amendment | View on EDGAR |
| 2019-06-30 | 2019-08-14 | 13F-HR | View on EDGAR |
| 2019-03-31 | 2019-05-15 | 13F-HR | View on EDGAR |
| 2018-12-31 | 2019-02-14 | 13F-HR | View on EDGAR |
| 2018-09-30 | 2018-11-14 | 13F-HR | View on EDGAR |
| 2018-06-30 | 2018-08-14 | 13F-HR | View on EDGAR |
| 2018-03-31 | 2018-05-15 | 13F-HR | View on EDGAR |
| 2017-12-31 | 2018-02-14 | 13F-HR | View on EDGAR |
| 2017-09-30 | 2017-11-14 | 13F-HR | View on EDGAR |
| 2017-06-30 | 2017-08-14 | 13F-HR | View on EDGAR |
| 2017-03-31 | 2017-05-15 | 13F-HR | View on EDGAR |
| 2016-12-31 | 2017-02-14 | 13F-HR | View on EDGAR |
| 2016-09-30 | 2016-11-14 | 13F-HR | View on EDGAR |
| 2016-06-30 | 2016-08-15 | 13F-HR | View on EDGAR |
| 2016-03-31 | 2016-05-16 | 13F-HR | View on EDGAR |
| 2015-12-31 | 2016-02-16 | 13F-HR | View on EDGAR |
| 2015-09-30 | 2015-11-16 | 13F-HR | View on EDGAR |
| 2015-06-30 | 2015-08-14 | 13F-HR | View on EDGAR |
| 2015-03-31 | 2015-05-14 | 13F-HR | View on EDGAR |
| 2014-12-31 | 2015-02-17 | 13F-HR | View on EDGAR |
| 2014-09-30 | 2014-11-14 | 13F-HR | View on EDGAR |
| 2014-06-30 | 2014-08-14 | 13F-HR | View on EDGAR |
| 2014-03-31 | 2014-05-15 | 13F-HR | View on EDGAR |
| 2013-12-31 | 2014-02-13 | 13F-HR | View on EDGAR |
| 2013-09-30 | 2013-11-12 | 13F-HR | View on EDGAR |
| 2013-06-30 | 2013-08-12 | 13F-HR | View on EDGAR |
FAQ
What is Shannon River Fund Management LLC and what type of investor is it?
Shannon River Fund Management LLC is a investment manager that files SEC Form 13F quarterly, disclosing its U.S. public equity holdings to regulators. As of the most recent reporting period (2026-03-31), the firm manages a tracked equity portfolio valued at approximately $524.1M, spread across 28 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) — $88.5M (16.9%)
2. Marvell Technology INC (MRVL) — $55.8M (10.7%)
3. Live Nation Entertainment In (LYV) — $44.9M (8.6%)
4. Airbnb Inc-class A (ABNB) — $31.2M (6.0%)
5. Rambus INC (RMBS) — $28.7M (5.5%)
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 39 notable position adjustments: 13 new positions were initiated, 7 existing holdings were added to, 8 positions were partially reduced, and 11 were completely exited. The largest of these moves: Sold out: Pegasystems INC (PEGA); Sold out: Unity Software INC (U); New buy: Airbnb Inc-class A (ABNB); Sold out: Clearwater Analytics Holdings, Inc. (CWAN); Sold out: Ncino INC (NCNO)
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: 72.0%
• Communication Services: 12.1%
• Consumer Discretionary: 7.0%
• Industrials: 4.5%
• Real Estate: 2.3%
• Energy: 2.1%
Peer Institutions
Institutions with a similar AUM
CM
Conifer Management, L.L.C.
CIK 0001773994
Total reported value
$523.8M
6 stks
2026-03-31
Concentration100.0
Portfolio Stability33.2
Sector conviction100.0
AUM within 0.0% of this institution
View detail
GF
Greenfield FTC, Inc.
CIK 0001842727
Total reported value
$524.4M
3 stks
2026-03-31
Concentration100.0
Portfolio Stability37.4
Sector conviction0.0
AUM within 0.1% of this institution
View detail
ET
ESL Trust Services, LLC
CIK 0001785545
Total reported value
$523.6M
268 stks
2026-03-31
Concentration49.3
Portfolio Stability23.5
Sector conviction38.6
AUM within 0.1% of this institution
View detail
Similar Holdings Style
Institutions with overlapping top holdings
AM
Advanced Micro Devices INC
CIK 0000002488
Total reported value
$174.4M
4 stks
2026-03-31
Concentration100.0
Portfolio Stability18.7
Sector conviction100.0
1 of the top 5 holdings overlap, including Marvell Technology INC
View detail
EI
Essex Investment Management Co LLC
CIK 0000201772
Total reported value
$631.7M
305 stks
2026-03-31
Concentration3.9
Portfolio Stability37.7
Sector conviction65.5
1 of the top 5 holdings overlap, including Tower Semiconductor Ltd.
View detail
Harris Associates L P
CIK 0000813917
Total reported value
$75.0B
224 stks
2026-03-31
Concentration7.3
Portfolio Stability25.4
Sector conviction46.1
1 of the top 5 holdings overlap, including Airbnb Inc-class A
View detail