Shannon River Fund Management LLC
Filing Date
Global Rank
#2,551
/ 8,622
▼ 212
· as of Mar 2026
Top Industry
Semiconductors
34.7%
3Y Alpha vs SPY
+21.9%
Period ended 4 months ago
Filed May 14, 2026 · 3mo
25 quarters · since Mar 2020
Clone Performance
Jul 2023–Jul 2026 · vs SPYHypothetical growth of buying every stock this filer reported holding, rebalancing on each filing and indexed to the same start. Option positions cannot be bought this way and are left out.
Cloned portfolio
+175.6%
SPY
+67.9%
Annualised alpha
+21.4%
Max drawdown
−31.5%
Estimate. 13F holdings are quarter-lagged, so the clone rebalances about 45 days after each period end — when the filing becomes public — and it excludes option and short positions. It tracks 93% of reported value on average across 13 quarters. Past performance does not predict future results.
Portfolio Concentration
28 tracked positions · as of Mar 31, 2026 · Δ vs Dec 31, 2025Top Position
16.9%
+5.8 pts
Top 5
47.5%
+8.6 pts
Top 10
66.7%
+3.7 pts
HHI
688
Diversified+135
Portfolio Trend
25 quarters · across all stocks
Sector Breakdown
As of Mar 31, 2026| Sector | % Portfolio | Value |
|---|---|---|
| Technology | 66.5% | $348,694,889 |
| Communication Services | 11.3% | $59,272,381 |
| Industrials | 7.5% | $39,211,183 |
| Consumer Cyclical | 6.0% | $31,191,917 |
| Healthcare | 3.1% | $16,086,537 |
| Real Estate | 2.0% | $10,378,289 |
| Unclassified | 1.9% | $9,982,557 |
| Energy | 1.8% | $9,262,878 |
Last Quarter's Activity
Export CSVAdded To
Positions the filer increased
7 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| MRVL | Marvell Technology, Inc. | +185,889 | 563,573 | $55,821,905 | |
| HNGE | Hinge Health, Inc. | +183,828 | 417,182 | $16,086,537 | |
| LYV | Live Nation Entertainment, Inc. | +38,965 | 294,398 | $44,898,638 | |
| AXON | Axon Enterprise, Inc. | +26,726 | 47,442 | $20,148,142 | |
| LGN | Legence Corp. | +2,775 | 337,638 | $19,063,041 | |
| IDCC | InterDigital, Inc. | +614 | 54,104 | $16,339,408 | |
| PLTR | Palantir Technologies Inc. | +185 | 29,150 | $4,264,062 | |
| No positions match the current search. | |||||
Trimmed
Positions the filer reduced
8 positions
| Ticker | Company | Δ Shares | Shares | Value | Open |
|---|---|---|---|---|---|
| EXTR | Extreme Networks Inc | −591,467 | 1,313,061 | $19,800,959 | |
| AMBA | Ambarella Inc | −186,153 | 114,940 | $5,917,111 | |
| ALAB | Astera Labs, Inc. | −120,247 | 47,394 | $5,194,382 | |
| TSEM | Tower Semiconductor Ltd | −98,565 | 504,239 | $88,483,859 | |
| COHR | Coherent Corp. | −80,013 | 87,905 | $20,939,850 | |
| GWRE | Guidewire Software, Inc. | −63,194 | 62,863 | $9,401,790 | |
| CLS | Celestica Inc | −53,635 | 53,495 | $15,068,471 | |
| FLEX | Flex Ltd. | −2,050 | 311,223 | $20,372,657 | |
| No positions match the current search. | |||||
New Positions
Positions the filer opened this quarter
13 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| ABNB | Airbnb, Inc. | 247,006 | $31,191,917 | |
| RMBS | Rambus Inc | 333,817 | $28,718,276 | |
| TOST | Toast, Inc. | 732,027 | $19,406,035 | |
| ADTN | ADTRAN Holdings, Inc. | 1,219,976 | $15,347,298 | |
| FFIV | F5, Inc. | 50,196 | $14,523,208 | |
| LION | Lionsgate Studios Corp. | 1,040,934 | $9,982,557 | |
| UUUU | Energy Fuels Inc | 507,555 | $9,262,878 | |
| SPHR | Sphere Entertainment Co. | 73,345 | $8,610,703 | |
| APP | AppLovin Corp | 14,480 | $5,763,040 | |
| DLR | Digital Realty Trust, Inc. | 29,838 | $5,377,105 | |
| OSIS | Osi Systems Inc | 19,274 | $5,117,439 | |
| EQIX | Equinix Inc | 5,102 | $5,001,184 | |
| SNOW | Snowflake Inc. | 26,377 | $3,978,179 | |
| No positions match the current search. | ||||
Sold Out
Positions the filer fully exited
11 positions
| Ticker | Company | Shares | Value | Open |
|---|---|---|---|---|
| PEGA | Pegasystems Inc | 1,038,832 | $62,039,047 | |
| U | Unity Software Inc. | 1,065,452 | $47,061,014 | |
| CWAN | Clearwater Analytics Holdings, Inc. | 1,236,412 | $29,822,257 | |
| NCNO | nCino, Inc. | 1,135,922 | $29,125,040 | |
| KVYO | Klaviyo, Inc. | 729,703 | $23,693,456 | |
| CRDO | Credo Technology Group Holding Ltd | 149,966 | $21,578,607 | |
| DOCU | Docusign, Inc. | 156,813 | $10,726,009 | |
| CCC | CCC Intelligent Solutions Holdings Inc. | 1,075,546 | $8,550,590 | |
| QCOM | Qualcomm Inc/De | 46,212 | $7,904,562 | |
| MU | Micron Technology Inc | 20,400 | $5,822,364 | |
| WIX | Wix.com Ltd. | 46,731 | $4,854,883 | |
| No positions match the current search. | ||||
28 tracked positions ·
$524,080,631 total
· filing declares
28 positions · $524,080,072
· as of Mar 31, 2026
All sectors
Communication Services
Consumer Cyclical
Energy
Healthcare
Industrials
Real Estate
Technology
| Ticker | Company | Type | Shares | Value (USD) | % of Portfolio | History |
|---|---|---|---|---|---|---|
| TSEM |
Tower Semiconductor Ltd
Technology
|
Reduced | 504,239 | $88,483,859 | 16.88% | |
| MRVL |
Marvell Technology, Inc.
Technology
|
Added | 563,573 | $55,821,905 | 10.65% | |
| LYV |
Live Nation Entertainment, Inc.
Communication Services
|
Added | 294,398 | $44,898,638 | 8.57% | |
| ABNB |
Airbnb, Inc.
Consumer Cyclical
|
NEW | 247,006 | $31,191,917 | 5.95% | |
| RMBS |
Rambus Inc
Technology
|
NEW | 333,817 | $28,718,276 | 5.48% | |
| COHR |
Coherent Corp.
Technology
|
Reduced | 87,905 | $20,939,850 | 4.00% | |
| FLEX |
Flex Ltd.
Technology
|
Reduced | 311,223 | $20,372,657 | 3.89% | |
| AXON |
Axon Enterprise, Inc.
Industrials
|
Added | 47,442 | $20,148,142 | 3.84% | |
| EXTR |
Extreme Networks Inc
Technology
|
Reduced | 1,313,061 | $19,800,959 | 3.78% | |
| TOST |
Toast, Inc.
Technology
|
NEW | 732,027 | $19,406,035 | 3.70% | |
| LGN |
Legence Corp.
Industrials
|
Added | 337,638 | $19,063,041 | 3.64% | |
| IDCC |
InterDigital, Inc.
Technology
|
Added | 54,104 | $16,339,408 | 3.12% | |
| HNGE |
Hinge Health, Inc.
Healthcare
|
Added | 417,182 | $16,086,537 | 3.07% | |
| ADTN |
ADTRAN Holdings, Inc.
Technology
|
NEW | 1,219,976 | $15,347,298 | 2.93% | |
| CLS |
Celestica Inc
Technology
|
Reduced | 53,495 | $15,068,471 | 2.88% | |
| FFIV |
F5, Inc.
Technology
|
NEW | 50,196 | $14,523,208 | 2.77% | |
| LION |
Lionsgate Studios Corp.
|
NEW | 1,040,934 | $9,982,557 | 1.90% | |
| GWRE |
Guidewire Software, Inc.
Technology
|
Reduced | 62,863 | $9,401,790 | 1.79% | |
| UUUU |
Energy Fuels Inc
Energy
|
NEW | 507,555 | $9,262,878 | 1.77% | |
| SPHR |
Sphere Entertainment Co.
Communication Services
|
NEW | 73,345 | $8,610,703 | 1.64% | |
| AMBA |
Ambarella Inc
Technology
|
Reduced | 114,940 | $5,917,111 | 1.13% | |
| APP |
AppLovin Corp
Communication Services
|
NEW | 14,480 | $5,763,040 | 1.10% | |
| DLR |
Digital Realty Trust, Inc.
Real Estate
|
NEW | 29,838 | $5,377,105 | 1.03% | |
| ALAB |
Astera Labs, Inc.
Technology
|
Reduced | 47,394 | $5,194,382 | 0.99% | |
| OSIS |
Osi Systems Inc
Technology
|
NEW | 19,274 | $5,117,439 | 0.98% | |
| EQIX |
Equinix Inc
Real Estate
|
NEW | 5,102 | $5,001,184 | 0.95% | |
| PLTR |
Palantir Technologies Inc.
Technology
|
Added | 29,150 | $4,264,062 | 0.81% | |
| SNOW |
Snowflake Inc.
Technology
|
NEW | 26,377 | $3,978,179 | 0.76% |
Covers the securities this platform tracks: U.S.-listed common stock and the put/call positions reported on it. A 13F can also report security types outside that coverage — preferred shares, bonds, warrants, untracked share classes — so the filing's own declared total can exceed the figures above. The source filing is linked at the top of this table.