Stocks/Funds/CIK 1301050

Shannon River Fund Management LLC

Quarterly 13F filings · Latest period 2026-03-31 · CIK 1301050
Assets
$524M
+36.8% YoY
Holdings
28
Lifetime alpha vs market
+16.25% annual
Average hold time
1.3 yr
median 0.5 yr

Quarterly history

Cum return +178% vs S&P +52% · α +126% lifetimeAUM $524M · peak $1.9BFlow $-142M (-22%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-9.18%
trims when stocks drop
when a holding falls −10%+
Middle response
-14.19%
baseline attrition
Rally response
-7.55%
trims into rallies
when a holding rises +10%+

Top positions · 28

Ticker$ value% portYoYHold time
TSEMTower Semiconductor Ltd.$88M16.9%+392.1%2.5 yr
MRVLMarvell Technology, Inc.$56M10.7%+61.3%2.3 yr
LYVLive Nation Entertainmen$45M8.6%+16.8%0.5 yr
ABNBAirbnb, Inc.$31M6.0%+5.7%0.3 yr
RMBSRambus Inc.$29M5.5%+66.1%1.8 yr
COHRCoherent, Inc.$21M4.0%+266.8%1.0 yr
FLEXFlex Ltd.$20M3.9%+97.9%6.8 yr
AXONAxon Enterprise, Inc.$20M3.8%-19.3%0.5 yr
EXTRExtreme Networks, Inc.$20M3.8%+14.0%0.5 yr
TOSTToast, Inc.$19M3.7%-20.1%0.3 yr
LGNLegence Corp. Class A Co$19M3.6%0.5 yr
IDCCInterDigital, Inc.$16M3.1%+47.2%7.5 yr
HNGEHinge Health, Inc.$16M3.1%0.5 yr
$15M2.9%0.3 yr
CLSCelestica Inc.$15M2.9%+257.4%0.8 yr

Portfolio composition (YoY)

Industry mix
Semiconductors35.1%+10.3pp$184M
Hardware, Equipment & Parts11.7%+3.0pp$61M
Entertainment10.2%$54M
Software - Infrastructure7.3%-2.0pp$38M
Software - Application6.8%-46.0pp$35M
Travel Services6.0%$31M
Unknown4.8%$25M
Aerospace & Defense3.8%$20M
Communication Equipment3.8%$20M
Engineering & Construction3.6%$19M
Country
US71.5%-3.6pp
IL16.9%+0.7pp
Unknown4.8%
SG3.9%-4.9pp
CA2.9%
Top 5: 47.5% · Top 10: 66.7% · Top 25: 97.5%

Winners

TickerPrev $PnLYoY %
TSEM$43M+0.17B392.1%
FLEX$34M+0.03B97.9%
IDCC$47M+0.02B47.2%
MRVL$20M+0.01B61.3%
PLTR$16M+0.01B73.3%

Losers

TickerPrev $PnLYoY %
GWRE$27M-0.01B-20.2%

Top buys this quarter · 15

ABNB Airbnb, Inc.new+$31M
TOST Toast, Inc.new+$19M
MRVL Marvell Technology, Inc.+$18M
FFIV F5, Inc.new+$15M
AXON Axon Enterprise, Inc.+$11M
UUUU Energy Fuels Inc.new+$9M
SPHR Sphere Entertainment Co.new+$9M
HNGE Hinge Health, Inc.+$7M
LYV Live Nation Entertainment, Inc+$6M
APP AppLovin Corporationnew+$6M

Top sells this quarter · 15

PEGA Pegasystems Inc.exit$44M
RMBS Rambus Inc.$19M
CWAN Clearwater Analytics Holdings,exit$29M
OSIS OSI Systems, Inc.$26M
U Unity Software Inc.exit$23M
EQIX Equinix, Inc.$21M
COHR Coherent, Inc.$19M
TSEM Tower Semiconductor Ltd.$71M
NCNO nCino, Inc.exit$17M
CLS Celestica Inc.$15M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$524M28+82.00%+17.59%+64.41%-0.14B
2025-12-31$638M26+52.07%+17.72%+34.35%-0.13B
2025-09-30$621M20+44.34%+17.52%+26.82%-0.14B
2025-06-30$649M22+35.12%+14.94%+20.18%+0.19B
2025-03-31$383M14+17.17%+8.30%+8.87%-0.05B
2024-12-31$501M16+41.75%+24.89%+16.86%-0.28B
2024-09-30$662M18+45.99%+36.04%+9.96%+0.02B
2024-06-30$580M20+22.99%+24.49%-1.50%+0.12B
2024-03-31$449M18+35.05%+29.62%+5.43%+0.07B
2023-12-31$361M17+48.71%+26.18%+22.53%-0.05B
2023-09-30$340M15+31.26%+21.57%+9.69%-0.03B
2023-06-30$401M15+37.58%+19.42%+18.16%-0.10B
2023-03-31$443M27-3.51%-7.82%+4.31%+0.08B
2022-12-31$315M29+6.67%+7.56%-0.89%+0.07B
2022-09-30$233M29-2.51%-4.93%+2.42%-0.11B
2022-06-30$350M32-20.25%-16.11%-4.14%-0.28B