Shannon River Fund Management
Shannon River Fund Management reported 37 stocks worth $1.1B in its 13F filing for Q2 2026, filed Aug 13, 2026. Its largest holdings are TSEM (8.9%), FLEX (5.5%) and AMD (5.5%). Compared with Q1 2026, the fund opened new positions in AMD, KLIC and TWLO, added to FLEX, IDCC and CLS, trimmed TSEM, LYV and RMBS and sold out of MRVL, AXON and TOST.
Holdings
| # | Stock | Value | Weight | Shares | Change | Shares, 8 qtrs | Held |
|---|---|---|---|---|---|---|---|
| 1 |  TSEM Tower Semiconductor Ltd | $99.8M | 8.9% | 383K | −121K (−24%) | 8 of 8 | |
| 2 |  FLEX Flex Ltd | $61.6M | 5.5% | 380K | +69K (+22%) | 8 of 8 | |
| 3 |  AMD Advanced Micro Devices Inc | $61.4M | 5.5% | 106K | New position | 1 of 8 | |
| 4 |  IDCC Interdigital Inc | $52.2M | 4.7% | 184K | +130K (+241%) | 8 of 8 | |
| 5 |  CLS Celestica Inc | $51.1M | 4.6% | 140K | +86K (+162%) | 4 of 8 | |
| 6 |  COHR Coherent Corp | $51M | 4.5% | 129K | +41K (+47%) | 5 of 8 | |
| 7 |  HNGE Hinge Health Inc | $46.6M | 4.2% | 561K | +144K (+35%) | 3 of 8 | |
| 8 |  EXTR Extreme Networks | $46.1M | 4.1% | 1.4M | +111K (+8%) | 3 of 8 | |
| 9 |  KLIC KULICKE & SOFFA INDS INC | $44.8M | 4.0% | 335K | New position | 1 of 8 | |
| 10 |  TWLO Twilio Inc | $41.5M | 3.7% | 201K | New position | 1 of 8 |
Positions at Jun 30, 2026, as reported. Change is against the fund's Q1 2026 filing; weight is the share of the fund's reported stocks.
Sold out
held in Q1 2026, gone in Q2 2026| Stock | Value last quarter | Shares sold |
|---|---|---|
 MRVL Marvell Technology Inc | $55.8M | 564K |
 AXON Axon Enterprise Inc | $20.1M | 47K |
 TOST Toast Inc | $19.4M | 732K |
 LGN Legence Corp | $19.1M | 338K |
 ADTN Adtran Holdings Inc | $15.3M | 1.2M |
🔒 Free account: see all 13.
Reported value
last 8 quartersThe value of the US stocks the fund reported, at quarter end prices. It moves with the market as well as with buying and selling.
Filings for Q2 2026
straight from the SEC| Filed | Form | Quarter | |
|---|---|---|---|
| Aug 13, 2026 | 13F-HR | Q2 2026 | SEC filing ↗ |
Other superinvestors
All hedge fund holdings →Shannon River Fund Management 13F FAQ
What does Shannon River Fund Management own?
Shannon River Fund Management reported 37 stocks worth $1.1B in its 13F filing for Q2 2026, filed Aug 13, 2026. Its largest holdings are TSEM (8.9%), FLEX (5.5%) and AMD (5.5%). The table above lists every position in the filing (the top 10 without an account).
What did Shannon River Fund Management buy and sell in Q2 2026?
Compared with Q1 2026: 22 new positions, 12 added to, 3 trimmed and 13 sold out. New positions include AMD, KLIC and TWLO. It sold all of MRVL, AXON and TOST.
When will Shannon River Fund Management file its next 13F?
Holdings as of Sep 30, 2026 are due by Nov 16, 2026. The filing appears on this page within minutes of reaching the SEC.
How much is Shannon River Fund Management's portfolio worth?
The Q2 2026 filing reports $1.1B in US stocks. That leaves out cash, bonds, short positions and most foreign holdings, so the fund's total assets are usually larger.
For informational and educational purposes only. Not investment advice, and not a recommendation to buy or sell any security. Holdings come from the fund's SEC Form 13F filings as reported and show positions at the end of the quarter, up to 45 days before the filing. The fund may have changed its positions since. A 13F leaves out short positions, cash, bonds and most foreign holdings. See all hedge fund holdings.