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SRFM
Shannon River Fund Management Portfolio holdings
AUM
$1.12B
Turnover
70%
1-Year Est. Return
150.26%
This Fund
S&P 500
This Quarter
Est. Return
+10.64%
1 Year Est. Return
+150.26%
3 Year Est. Return
+553.98%
5 Year Est. Return
+735.5%
10 Year Est. Return
+5,351.96%
AUM
$524M
AUM Growth
-$113M
(-18%)
Cap. Flow
-$134M
Cap. Flow
% of AUM
-25.57%
Top 10 Holdings %
Top 10 Hldgs %
66.74%
Holding
39
New
13
Increased
7
Reduced
8
Closed
11
Avg Time Held
0.7
years
Top 10 Avg Time Held
0.5
years
Top 20 Avg Time Held
0.9
years
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Rambus
RMBS
|
+$33.3M |
| 2 |
Airbnb
ABNB
|
+$32.1M |
| 3 |
Toast
TOST
|
+$21.8M |
| 4 |
Marvell Technology
MRVL
|
+$15.6M |
| 5 |
F5
FFIV
|
+$13.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Pegasystems
PEGA
|
+$62M |
| 2 |
Unity
U
|
+$47.1M |
| 3 |
Clearwater Analytics
CWAN
|
+$29.8M |
| 4 |
nCino
NCNO
|
+$29.1M |
| 5 |
Klaviyo
KVYO
|
+$23.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 66.53% |
| 2 | Communication Services | 13.21% |
| 3 | Industrials | 7.48% |
| 4 | Consumer Discretionary | 5.95% |
| 5 | Healthcare | 3.07% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | Held Since | |
|---|---|---|---|---|---|---|---|
1
Tower Semiconductor
TSEM
$22.4B
| $88.5M | 16.88% |
504,239
-98,565
| -16% | -$13.3M |
2023 Q4
9 quarters
|
|
|
2
Marvell Technology
MRVL
$207B
| $55.8M | 10.65% |
563,573
+185,889
| +49% | +$15.6M |
2024 Q2
7 quarters
|
|
3
Live Nation Entertainment
LYV
$39.5B
| $44.9M | 8.57% |
294,398
+38,965
| +15% | +$5.9M |
2025 Q4
1 quarter
|
|
|
4
Airbnb
ABNB
$102B
| $31.2M | 5.95% |
+247,006
| New | +$32.1M |
2026 Q1
0 quarters
|
|
|
5
Rambus
RMBS
$9.55B
| $28.7M | 5.48% |
+333,817
| New | +$33.3M |
2026 Q1
0 quarters
|
|
6
Coherent
COHR
$46.1B
| $20.9M | 4% |
87,905
-80,013
| -48% | -$18.3M |
2025 Q2
3 quarters
|
|
7
Flex
FLEX
$33.8B
| $20.4M | 3.89% |
311,223
-2,050
| -0.7% | -$131K |
2019 Q3
26 quarters
|
|
8
Axon Enterprise
AXON
$32.1B
| $20.1M | 3.84% |
47,442
+26,726
| +129% | +$13.9M |
2025 Q4
1 quarter
|
|
9
Extreme Networks
EXTR
$2.88B
| $19.8M | 3.78% |
1,313,061
-591,467
| -31% | -$8.83M |
2025 Q4
1 quarter
|
|
|
10
Toast
TOST
$18.1B
| $19.4M | 3.7% |
+732,027
| New | +$21.8M |
2026 Q1
0 quarters
|
|
11
Legence Corp
LGN
$3.34B
| $19.1M | 3.64% |
337,638
+2,775
| +0.8% | +$140K |
2025 Q4
1 quarter
|
|
12
InterDigital
IDCC
$8.21B
| $16.3M | 3.12% |
54,104
+614
| +1% | +$209K |
2022 Q4
13 quarters
|
|
13
Hinge Health
HNGE
$7.98B
| $16.1M | 3.07% |
417,182
+183,828
| +79% | +$7.64M |
2025 Q4
1 quarter
|
|
14
Adtran
ADTN
$517M
| $15.3M | 2.93% |
+1,219,976
| New | +$12.4M |
2026 Q1
0 quarters
|
|
15
Celestica
CLS
$38.3B
| $15.1M | 2.88% |
53,495
-53,635
| -50% | -$15.6M |
2025 Q4
1 quarter
|
|
|
16
F5
FFIV
$25B
| $14.5M | 2.77% |
+50,196
| New | +$13.9M |
2026 Q1
0 quarters
|
|
17
Lionsgate Studios
LION
$3.16B
| $9.98M | 1.9% |
+1,040,934
| New | +$9.61M |
2026 Q1
0 quarters
|
|
18
Guidewire Software
GWRE
$13.7B
| $9.4M | 1.79% |
62,863
-63,194
| -50% | -$9.62M |
2024 Q1
8 quarters
|
|
19
Energy Fuels
UUUU
$2.2B
| $9.26M | 1.77% |
+507,555
| New | +$10.5M |
2026 Q1
0 quarters
|
|
20
Sphere Entertainment
SPHR
$3.69B
| $8.61M | 1.64% |
+73,345
| New | +$7.67M |
2026 Q1
0 quarters
|
|
21
Ambarella
AMBA
$2.74B
| $5.92M | 1.13% |
114,940
-186,153
| -62% | -$11.6M |
2025 Q4
1 quarter
|
|
22
Applovin
APP
$89.2B
| $5.76M | 1.1% |
+14,480
| New | +$7M |
2026 Q1
0 quarters
|
|
23
Digital Realty Trust
DLR
$64.9B
| $5.38M | 1.03% |
+29,838
| New | +$5.1M |
2026 Q1
0 quarters
|
|
24
Astera Labs
ALAB
$49.7B
| $5.19M | 0.99% |
47,394
-120,247
| -72% | -$17.1M |
2025 Q4
1 quarter
|
|
25
OSI Systems
OSIS
$3.11B
| $5.12M | 0.98% |
+19,274
| New | +$5.33M |
2026 Q1
0 quarters
|
|
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Shannon River Fund Management's Q1 2026 Portfolio in Review
As of Q1 2026, Shannon River Fund Management held 39 positions worth $524M, down 18% from $638M the previous quarter. Its ten largest holdings account for 67% of the portfolio.
Shannon River Fund Management withdrew a net $134M in Q1 2026, closing 11 positions and reducing 8 holdings. Its most notable exit was Pegasystems, an estimated $62M position sold in full.
By sector, the portfolio is most concentrated in Technology at 67% of assets, down from 88% a quarter earlier, followed by Communication Services and Industrials.
Against the trend, Shannon River Fund Management opened a new position in Rambus worth $28.7M.
- Shannon River Fund Management's largest Q1 2026 buy was Rambus: 333,817 shares worth $28.7M.
- Shannon River Fund Management added most to Marvell Technology in Q1 2026, an estimated $15.6M increase.
- Shannon River Fund Management's biggest Q1 2026 reduction was Coherent, cutting an estimated $18.3M.
- Shannon River Fund Management fully exited Pegasystems in Q1 2026, selling an estimated $62M.
- Shannon River Fund Management's ten largest holdings make up 67% of its $524M portfolio in Q1 2026.
- Shannon River Fund Management opened 13 new positions and closed 11 in Q1 2026.
- Shannon River Fund Management's portfolio value fell 18% quarter-over-quarter to $524M.
Based on Shannon River Fund Management's 13F filing for Q1 2026, filed 14 May 2026.