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Shannon River Fund Management LLC

CIK 1301050 · latest 13F filed 13 August 2026 · Read the filing on EDGAR

Shannon River Fund Management LLC reported 37 US-listed holdings worth $1.12 billion in its 13F for the quarter ended 30 June 2026, filed 13 August 2026. Its largest: Tower Semiconductor Ltd (8.9%), Flex Ltd. (5.5%) and Advanced Micro Devices Inc. (5.5%). Against the quarter before, it opened 22 positions, added to 12, trimmed 3 and sold out of 13.

Reported holdings$1.12B+113.8% on Q1 2026
Positions37+9 on Q1 2026
The largest ten49.6%of its reported holdings
Latest 13FQ2 2026filed 13 August 2026
Where the money is
OpenedAdded toTrimmed
TSEM8.9%FLEX5.5%AMD5.5%IDCC4.7%CLS4.6%COHR4.6%HNGE4.2%EXTR4.1%KLIC4.0%TWLO3.7%CIEN3.6%LYV3.5%RMBS3.5%QNT3.4%23 more36.4%

The 14 largest of its 37 positions, each sized by its share of the reported holdings, coloured by the change in shares against Q1 2026.

Reported holdings, quarter by quarter
Q3 2024: $661.7 million in 18 positions$662MQ3 24Q4 2024: $565.7 million in 17 positions$566MQ4 24Q1 2025: $383.2 million in 14 positions$383MQ1 25Q2 2025: $649.3 million in 22 positions$649MQ2 25Q3 2025: $621.2 million in 20 positions$621MQ3 25Q4 2025: $637.5 million in 26 positions$638MQ4 25Q1 2026: $524.1 million in 28 positions$524MQ1 26Q2 2026: $1.12 billion in 37 positions$1.12BQ2 26

What the fund reported holding at each quarter's end; hover a bar for the number of positions

What it did on the quarter

Opened 22Added 12Trimmed 3Sold out 13
Opened: 22Added: 12Trimmed: 3Sold out: 13

Its positions against its 13F for the quarter to 31 March 2026; a change under 0.1% of a position counts as held

Opened 22

  1. Advanced Micro Devices Inc. AMD$61.4 million
  2. Kulicke & Soffa Industries Inc. KLIC$44.8 million
  3. Twilio Inc. TWLO$41.5 million
  4. Ciena Corp. CIEN$39.9 million
  5. Quantinuum Inc. QNT$38.4 million
  6. Universal Technical Institute Inc. UTI$38.1 million
  7. Take-Two Interactive Software, Inc. TTWO$34.5 million
  8. Ouster Inc. OUST$28.1 million

and 14 more in the table below

Added to 12

  1. InterDigital, Inc. IDCC+130,284 shares · +241%
  2. Celestica Inc. CLS+86,469 shares · +162%
  3. Coherent Corp. COHR+41,378 shares · +47%
  4. Hinge Health Inc. HNGE+144,042 shares · +35%
  5. Flex Ltd. FLEX+68,611 shares · +22%
  6. Digital Realty Trust, Inc. DLR+58,926 shares · +197%
  7. Guidewire Software, Inc. GWRE+50,367 shares · +80%
  8. Extreme Networks Inc. EXTR+111,034 shares · +8%

and 4 more in the table below

Trimmed 3

  1. Tower Semiconductor Ltd TSEM-121,306 shares · -24%
  2. Live Nation Entertainment, Inc. LYV-78,361 shares · -27%
  3. Rambus Inc. RMBS-42,104 shares · -13%

Sold out of 13

  1. Marvell Technology, Inc. MRVL$55.8 million last quarter
  2. Axon Enterprise, Inc. AXON$20.1 million last quarter
  3. Toast, Inc. TOST$19.4 million last quarter
  4. Legence Corp. LGN$19.1 million last quarter
  5. Adtran Holdings Inc. ADTN$15.3 million last quarter
  6. Energy Fuels Inc. UUUU$9.3 million last quarter
  7. Ambarella Inc. AMBA$5.9 million last quarter
  8. AppLovin Corp. APP$5.8 million last quarter

What it holds

CompanySharesValueOf its bookChange in shares
Tower Semiconductor Ltd TSEM382,933$99.8 million8.91%-121,306
Flex Ltd. FLEX379,834$61.6 million5.49%+68,611
Advanced Micro Devices Inc. AMD105,751$61.4 million5.48%new
InterDigital, Inc. IDCC184,388$52.2 million4.66%+130,284
Celestica Inc. CLS139,964$51.1 million4.56%+86,469
Coherent Corp. COHR129,283$51.0 million4.55%+41,378
Hinge Health Inc. HNGE561,224$46.6 million4.16%+144,042
Extreme Networks Inc. EXTR1,424,095$46.1 million4.11%+111,034
Kulicke & Soffa Industries Inc. KLIC334,781$44.8 million4.00%new
Twilio Inc. TWLO201,352$41.5 million3.71%new
Ciena Corp. CIEN81,298$39.9 million3.56%new
Live Nation Entertainment, Inc. LYV216,037$39.6 million3.53%-78,361
Rambus Inc. RMBS291,713$38.7 million3.46%-42,104
Quantinuum Inc. QNT469,355$38.4 million3.42%new
Universal Technical Institute Inc. UTI890,113$38.1 million3.40%new
Airbnb, Inc. ABNB247,836$35.5 million3.17%+830
Take-Two Interactive Software, Inc. TTWO138,029$34.5 million3.08%new
Ouster Inc. OUST449,264$28.1 million2.51%new
PDF Solutions Inc. PDFS369,776$26.2 million2.34%new
Nokia Corporation NOK1,906,902$25.3 million2.26%new
Allient Inc. ALNT220,237$22.7 million2.02%new
Rocket Lab Corp. RKLB221,143$22.5 million2.01%new
F5, Inc. FFIV51,258$21.3 million1.90%+1,062
Dycom Industries Inc. DY39,473$20.0 million1.78%new
Cipher Mining Inc. CIFR667,931$16.4 million1.46%new
Lionsgate Studios Corp. LION1,050,445$16.1 million1.44%+9,511
Digital Realty Trust, Inc. DLR88,764$15.9 million1.42%+58,926
Guidewire Software, Inc. GWRE113,230$13.9 million1.24%+50,367
Sphere Entertainment Co. SPHR73,878$12.8 million1.14%+533
Global E Online Ltd GLBE353,200$12.3 million1.09%new
Amprius Technologies Inc. AMPX838,887$11.6 million1.04%new
Applied Digital Corp. APLD265,474$9.9 million0.88%new
Cloudflare Inc. NET23,589$5.8 million0.52%new
Amkor Technology, Inc. AMKR65,895$5.7 million0.51%new
Micron Technology Inc. MU4,484$5.2 million0.46%new
Babcock &amp Wilcox Enterprises BW333,153$4.7 million0.42%new
Maxlinear, Inc. MXL27,377$3.5 million0.31%new
Every US-listed position in the fund's 13F for the quarter ended 30 June 2026, by the value it reported.
Read moreChange is shares against its 13F for the quarter before; the 13 it sold out of are in the box above.