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Super Investors Shannon River Fund Management LLC
SR

Shannon River Fund Management LLC

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$1.12B
Positions
37
Quarter ended
June 30, 2026
Filed
August 13, 2026

Reported portfolio value by quarter (53 quarters reported)

$1.93B $233M
Q2 13 Q1 16 Q4 18 Q3 21 Q2 24 Q2 26

$836M in Q2 2013 → $1.12B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
Tower Semiconductor Ltd 8.9% Trimmed 24% 382,933 $99.8M
Flex Ltd 5.5% Added 22% 379,834 $61.6M
Advanced Micro Devices Inc 5.5% New 105,751 $61.4M
Interdigital Inc 4.7% Added 241% 184,388 $52.2M
Celestica Inc 4.6% Added 162% 139,964 $51.1M
Coherent Corp 4.6% Added 47% 129,283 $51M
Hinge Health Inc 4.2% Added 35% 561,224 $46.6M
Extreme Networks Inc 4.1% Added 8.5% 1,424,095 $46.1M
K& Kulicke & Soffa Inds Inc 4.0% New 334,781 $44.8M
Twilio Inc 3.7% New 201,352 $41.5M
Ciena Corp 3.6% New 81,298 $39.9M
LN Live Nation Entertainment In 3.5% Trimmed 27% 216,037 $39.6M
RD Rambus Inc Del 3.5% Trimmed 13% 291,713 $38.7M
Quantinuum Inc 3.4% New 469,355 $38.4M
UT Universal Technical Inst Inc 3.4% New 890,113 $38.1M
Airbnb Inc 3.2% Added 0.3% 247,836 $35.5M
TI Take-two Interactive Softwar 3.1% New 138,029 $34.5M
Ouster Inc 2.5% New 449,264 $28.1M
Pdf Solutions Inc 2.3% New 369,776 $26.2M
N Nokia Corp 2.3% New 1,906,902 $25.3M
Allient Inc 2.0% New 220,237 $22.7M
Rocket Lab Corp 2.0% New 221,143 $22.5M
F5 Inc 1.9% Added 2.1% 51,258 $21.3M
DI Dycom Inds Inc 1.8% New 39,473 $20M
Cipher Digital Inc 1.5% New 667,931 $16.4M
Lionsgate Studios Corp 1.4% Added 0.9% 1,050,445 $16.1M
DR Digital Rlty Tr Inc 1.4% Added 197% 88,764 $15.9M
Guidewire Software Inc 1.2% Added 80% 113,230 $13.9M
Sphere Entertainment Co 1.1% Added 0.7% 73,878 $12.8M
Global-e Online Ltd 1.1% New 353,200 $12.3M
Amprius Technologies Inc 1.0% New 838,887 $11.6M
Applied Digital Corp 0.9% New 265,474 $9.9M
Cloudflare Inc 0.5% New 23,589 $5.79M
Amkor Technology Inc 0.5% New 65,895 $5.68M
Micron Technology Inc 0.5% New 4,484 $5.18M
Babcock & Wilcox Enterprises 0.4% New 333,153 $4.7M
Maxlinear Inc 0.3% New 27,377 $3.51M

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 13, 2026

Company Action Shares changed Value of change % of portfolio
Advanced Micro Devices Inc New +105,751 +$61.4M 5.5%
Marvell Technology Inc Exited −563,573 −$55.8M —
K& Kulicke & Soffa Inds Inc New +334,781 +$44.8M 4.0%
Twilio Inc New +201,352 +$41.5M 3.7%
Ciena Corp New +81,298 +$39.9M 3.6%
Quantinuum Inc New +469,355 +$38.4M 3.4%
UT Universal Technical Inst Inc New +890,113 +$38.1M 3.4%
Interdigital Inc Added +130,284 +$36.9M 4.7%
TI Take-two Interactive Softwar New +138,029 +$34.5M 3.1%
Tower Semiconductor Ltd Trimmed −121,306 −$31.6M 8.9%

Showing the 10 largest of 50 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 14, 2026

Company Action Shares changed Value of change % of portfolio
Pegasystems Inc Exited −1,038,832 −$62M —
Unity Software Inc Exited −1,065,452 −$47.1M —
Airbnb Inc New +247,006 +$31.2M 6.0%
CA Clearwater Analytics Hldgs I Exited −1,236,412 −$29.8M —
Ncino Inc Exited −1,135,922 −$29.1M —
RD Rambus Inc Del New +333,817 +$28.7M 5.5%
Klaviyo Inc Exited −729,703 −$23.7M —
CT Credo Technology Group Holdi Exited −149,966 −$21.6M —
Toast Inc New +732,027 +$19.4M 3.7%
Coherent Corp Trimmed −80,013 −$19.1M 4.0%

Showing the 10 largest of 39 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

Company Action Shares changed Value of change % of portfolio
Unity Software Inc New +1,065,452 +$47.1M 7.4%
Tower Semiconductor Ltd Trimmed −359,259 −$42.2M 11.1%
Jfrog Ltd Exited −863,924 −$40.9M —
Interdigital Inc Trimmed −125,230 −$39.9M 2.7%
LN Live Nation Entertainment In New +255,433 +$36.4M 5.7%
Formfactor Inc Exited −968,161 −$35.3M —
Flex Ltd Trimmed −536,143 −$32.4M 3.0%
Extreme Networks New +1,904,528 +$31.7M 5.0%
Celestica Inc New +107,130 +$31.7M 5.0%
Wix Com Ltd Trimmed −283,352 −$29.4M 0.8%

Showing the 10 largest of 30 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 13, 2025

Company Action Shares changed Value of change % of portfolio
IT Ishares Tr Exited −300,000 −$64.7M —
Coherent Corp Trimmed −356,184 −$38.4M 1.5%
Pegasystems Inc Exited −700,000 −$37.9M —
Tower Semiconductor Ltd Trimmed −505,441 −$36.5M 11.2%
Formfactor Inc New +968,161 +$35.3M 5.7%
Jfrog Ltd Added +647,140 +$30.6M 6.6%
Clean Harbors Inc New +115,870 +$26.9M 4.3%
Flex Ltd Trimmed −452,500 −$26.2M 7.9%
AH Affirm Hldgs Inc Exited −356,563 −$24.7M —
Marvell Technology Inc Trimmed −286,530 −$24.1M 5.7%

Showing the 10 largest of 29 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 13, 2025

Company Action Shares changed Value of change % of portfolio
IT Ishares Tr New +300,000 +$64.7M 8.6%
Pegasystems Inc Added +737,814 +$39.9M 9.9%
Coherent Corp New +445,440 +$39.7M 5.3%
Pegasystems Inc New +700,000 +$37.9M 5.0%
Ncino Inc New +1,239,033 +$34.7M 4.6%
Qorvo Inc Exited −443,100 −$32.1M —
Marvell Technology Inc Added +379,129 +$29.3M 7.3%
Docusign Inc New +325,915 +$25.4M 3.4%
AH Affirm Hldgs Inc New +356,563 +$24.7M 3.3%
Wix Com Ltd Added +114,075 +$18.1M 4.9%

Showing the 10 largest of 26 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 14, 2025

Company Action Shares changed Value of change % of portfolio
SS SPDR S&P 500 ETF Tr Exited −150,000 −$87.9M —
Wix Com Ltd Exited −301,446 −$64.7M —
Interdigital Inc Trimmed −156,643 −$32.4M 12.1%
Qorvo Inc New +443,100 +$32.1M 8.4%
Elastic N V New +358,934 +$32M 8.3%
Marvell Technology Inc Exited −217,300 −$24M —
PH Paypal Hldgs Inc Exited −269,470 −$23M —
Blackline Inc Exited −326,313 −$19.8M —
Marvell Technology Inc Trimmed −321,162 −$19.8M 5.3%
Wix Com Ltd New +118,173 +$19.3M 5.0%

Showing the 10 largest of 24 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 13, 2025

Company Action Shares changed Value of change % of portfolio
SS SPDR S&P 500 ETF Tr New +150,000 +$87.9M 13.0%
Wix Com Ltd New +301,446 +$64.7M 9.5%
IT Ishares Tr Exited −2,400 −$53M —
Wix Com Ltd Exited −296,411 −$49.6M —
Cognex Corp Exited −1,068,933 −$43.3M —
Adobe Inc Exited −77,379 −$40.1M —
Celestica Inc Exited −553,425 −$28.3M —
Dynatrace Inc Exited −501,536 −$26.8M —
Informatica Inc Trimmed −979,372 −$25.4M 2.4%
Marvell Technology Inc New +217,300 +$24M 3.5%

Showing the 10 largest of 27 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 13, 2024

Company Action Shares changed Value of change % of portfolio
Pegasystems Inc New +788,367 +$57.6M 8.1%
IT Ishares Tr New +2,400 +$53M 7.4%
Nvidia Corporation Exited −412,710 −$51M —
VE Vaneck ETF Trust Exited −150,000 −$39.1M —
Informatica Inc Added +1,218,836 +$30.8M 5.7%
Tower Semiconductor Ltd Trimmed −645,135 −$28.6M 8.3%
Celestica Inc New +553,425 +$28.3M 4.0%
PH Paypal Hldgs Inc New +278,900 +$21.8M 3.0%
Adobe Inc Added +31,816 +$16.5M 5.6%
VS Varonis Sys Inc Exited −329,082 −$15.8M —

Showing the 10 largest of 27 changes.

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