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Shannon River Fund Management LLC: 13F holdings, Q2 2026

Hedge fund · SEC EDGAR filings (CIK 1301050) · Explore on the interactive board

Shannon River Fund Management LLC disclosed 37 US equity positions worth $1.1bn in its Q2 2026 13F filing (holdings as of June 30, 2026, filed August 13, 2026). Its largest position is TSEM at 8.9% of the reported book, followed by FLEX, AMD. The top ten holdings are 49.6% of the book, and the portfolio behaves like about 26 equal-weight positions. Versus the prior filing it opened 22 new positions, added to 11, reduced 3 and exited 13. Note: this manager's most recent filing is 3934 quarters behind the newest quarter on file, so these figures are history rather than current positioning.

This manager's most recent filing is 3934 quarter(s) behind the newest quarter on file. Treat these figures as history, not current positioning.
$1.1bnreported US equity book
37positions
8.9%largest position
49.6%top 10 weight
25.54effective positions (1/HHI)
2quarters on file since Q1 2026

What does Shannon River Fund Management LLC own? Top holdings as of June 30, 2026

Change is measured in shares against the previous filing (Q1 2026), so price moves do not read as decisions. This quarter: 22 new, 11 added, 3 reduced, 13 exited.

#StockSectorWeightValueSharesΔ sharesAction
1 TSEM TOWER SEMICONDUCTOR LTD Technology 8.9%$99.8m382,933 -24% reduced
2 FLEX FLEX LTD Technology 5.5%$61.6m379,834 22% added
3 AMD ADVANCED MICRO DEVICES INC Technology 5.5%$61.4m105,751 new
4 IDCC INTERDIGITAL INC Technology 4.7%$52.2m184,388 241% added
5 CLS CELESTICA INC Technology 4.6%$51.1m139,964 162% added
6 COHR COHERENT CORP Technology 4.6%$51.0m129,283 47% added
7 HNGE HINGE HEALTH INC Healthcare 4.2%$46.6m561,224 35% added
8 EXTR EXTREME NETWORKS INC Technology 4.1%$46.1m1,424,095 8% added
9 KLIC KULICKE & SOFFA INDS INC Technology 4.0%$44.8m334,781 new
10 TWLO TWILIO INC Technology 3.7%$41.5m201,352 new
11 CIEN CIENA CORP Technology 3.6%$39.9m81,298 new
12 LYV LIVE NATION ENTERTAINMENT IN Communication Services 3.5%$39.6m216,037 -27% reduced
13 RMBS RAMBUS INC DEL Technology 3.5%$38.7m291,713 -13% reduced
14 QUANTINUUM INC 3.4%$38.4m469,355 new
15 UTI UNIVERSAL TECHNICAL INST INC Consumer Defensive 3.4%$38.1m890,113 new
16 ABNB AIRBNB INC Consumer Cyclical 3.2%$35.5m247,836 0% held
17 TTWO TAKE-TWO INTERACTIVE SOFTWAR Communication Services 3.1%$34.5m138,029 new
18 OUST OUSTER INC Technology 2.5%$28.1m449,264 new
19 PDFS PDF SOLUTIONS INC Technology 2.3%$26.2m369,776 new
20 NOK NOKIA CORP Technology 2.3%$25.3m1,906,902 new
21 ALNT ALLIENT INC Technology 2.0%$22.7m220,237 new
22 RKLB ROCKET LAB CORP Industrials 2.0%$22.5m221,143 new
23 FFIV F5 INC Technology 1.9%$21.3m51,258 2% added
24 DY DYCOM INDS INC Industrials 1.8%$20.0m39,473 new
25 CIFR CIPHER DIGITAL INC Technology 1.5%$16.4m667,931 new
26 LION LIONSGATE STUDIOS CORP 1.4%$16.1m1,050,445 1% added
27 DLR DIGITAL RLTY TR INC Real Estate 1.4%$15.9m88,764 197% added
28 GWRE GUIDEWIRE SOFTWARE INC Technology 1.2%$13.9m113,230 80% added
29 SPHR SPHERE ENTERTAINMENT CO Communication Services 1.1%$12.8m73,878 1% added
30 GLBE GLOBAL-E ONLINE LTD Consumer Cyclical 1.1%$12.3m353,200 new
31 AMPX AMPRIUS TECHNOLOGIES INC Industrials 1.0%$11.6m838,887 new
32 APLD APPLIED DIGITAL CORP Technology 0.9%$9.9m265,474 new
33 NET CLOUDFLARE INC Technology 0.5%$5.8m23,589 new
34 AMKR AMKOR TECHNOLOGY INC Technology 0.5%$5.7m65,895 new
35 MU MICRON TECHNOLOGY INC Technology 0.5%$5.2m4,484 new
36 BW BABCOCK & WILCOX ENTERPRISES 0.4%$4.7m333,153 new
37 MXL MAXLINEAR INC Technology 0.3%$3.5m27,377 new

What did Shannon River Fund Management LLC sell? Positions exited since the previous filing

StockPrior weightPrior value
MRVL MARVELL TECHNOLOGY INC32.0%$55.8m
AXON AXON ENTERPRISE INC11.6%$20.1m
TOST TOAST INC11.1%$19.4m
LGN LEGENCE CORP10.9%$19.1m
ADTN ADTRAN HOLDINGS INC8.8%$15.3m
UUUU ENERGY FUELS INC5.3%$9.3m
AMBA AMBARELLA INC3.4%$5.9m
APP APPLOVIN CORP3.3%$5.8m
ALAB ASTERA LABS INC3.0%$5.2m
OSIS OSI SYSTEMS INC2.9%$5.1m
EQIX EQUINIX INC2.9%$5.0m
PLTR PALANTIR TECHNOLOGIES INC2.4%$4.3m
SNOW SNOWFLAKE INC2.3%$4.0m

Sector mix

SectorWeight
Technology68.9%
Communication Services7.8%
Industrials4.8%
Consumer Cyclical4.3%
Healthcare4.2%
Consumer Defensive3.4%

Sectors cover positions whose ticker resolved to a sector; the remainder is unclassified, not cash.

Filing history

QuarterPositionsEquity value
Q2 202637$1.1bn
Q1 202628$524.1m

How concentrated is Shannon River Fund Management LLC's portfolio?

Across every quarter Shannon River Fund Management LLC has filed, its median largest position is 12.9% of the book and its median top-ten weight is 58.2%, which WhaleCreep classifies as concentrated (the gate is a median largest position of 5%). Of 13.0 completed holding spells, the median lasted 1.0 quarters; 37.0 positions are still open and their final length is unknown.