Featured 13F manager
Shannon River Fund Management LLC Spencer Waxman
New York, NY 21 processed 13Fs on this site · 2021 Q3–2026 Q2
- $1.1B
- 37 Positions
- 2026 Q2
- +113.7% QoQ
- Top 5 29.1%
Spencer Waxman files Shannon River Fund Management LLC as a Form 13F. The latest book is 2026 Q2 at $1.1B, up 113.7% QoQ, led by Tower Semiconductor, Flextronics, and Advanced Micro Devices.
Portfolio
top 5 29.1% · top 10 49.6%
- TSEM - Tower Semiconductor 8.9%
- FLEX - Flextronics 5.5%
- AMD - Advanced Micro Devices 5.5%
- IDCC - Interdigital 4.7%
- CLS - Celestica 4.5%
- COHR - Coherent 4.5%
- HNGE — · CL A 4.2%
- EXTR - Extreme Networks 4.1%
- KLIC - Kulicke & Soffa Inds 4.0%
- TWLO - Twilio · CL A 3.7%
- CIEN - Ciena 3.6%
- LYV - Live Nation 3.5%
- Other 43.3%
AUM over time
Book
| Pegasystems | 9.88% | Add +116.2% | 1,372,565 | $54.13 | $74M | +737,814 | +$30M |
| FLEX - Flextronics | 8.64% | Add +28.4% | 1,301,916 | $49.92 | $65M | +288,334 | +$31M |
| TSEM - Tower Semiconductor | 8.46% | Add +23.0% | 1,467,504 | $43.35 | $64M | +274,791 | +$21M |
| MRVL - Marvell Technology | 7.31% | Add +114.5% | 710,174 | $77.40 | $55M | +379,129 | +$35M |
| IDCC - Interdigital | 7.05% | Add +5.1% | 236,571 | $224.23 | $53M | +11,569 | +$7M |
| COHR - Coherent | 5.28% | New | 445,440 | $89.21 | $40M | +445,440 | +$40M |
| WIX — | 4.89% | Add +96.5% | 232,248 | $158.46 | $37M | +114,075 | +$17M |
| GWRE - Guidewire Software | 4.72% | Add +3.0% | 150,708 | $235.45 | $35M | +4,420 | +$8M |
| NCNO - Ncino | 4.61% | New | 1,239,033 | $27.97 | $35M | +1,239,033 | +$35M |
| DOCU - Docusign | 3.38% | New | 325,915 | $77.89 | $25M | +325,915 | +$25M |
| AFRM - Affirm · CL A | 3.28% | New | 356,563 | $69.14 | $25M | +356,563 | +$25M |
| CART - Maplebear | 2.73% | Add +9.3% | 453,988 | $45.24 | $21M | +38,504 | +$4M |
| PLTR - Palantir Technologies · CL A | 2.50% | Reduce −29.0% | 138,008 | $136.32 | $19M | −56,392 | +$2M |
| CRDO - Credo Technology | 2.34% | New | 190,320 | $92.59 | $18M | +190,320 | +$18M |
| Elastic | 2.07% | Reduce −48.6% | 184,355 | $84.33 | $16M | −174,579 | −$16M |
| CWAN — · CL A | 1.95% | Reduce −51.2% | 667,281 | $21.93 | $15M | −699,612 | −$22M |
| MIR - Mirion Technologies · CL A | 1.59% | New | 555,377 | $21.53 | $12M | +555,377 | +$12M |
| CCC — | 1.35% | New | 1,077,802 | $9.41 | $10M | +1,077,802 | +$10M |
| U - Unity Software | 1.31% | New | 405,534 | $24.20 | $10M | +405,534 | +$10M |
| FROG - Jfrog | 1.27% | New | 216,784 | $43.88 | $10M | +216,784 | +$10M |
| NATL - Ncr Atleos | 1.17% | Add +5.1% | 307,366 | $28.53 | $9M | +14,802 | +$1M |
| PGY - Pagaya Technologies · CL A | 0.58% | New | 204,171 | $21.32 | $4M | +204,171 | +$4M |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2025 Q1
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| QRVO - Qorvo | 8.37% | Exit | 0 | $72.41 | $32M | −443,100 | −$32M |
| ZM - Zoom Communications · CL A | 2.09% | Exit | 0 | $73.77 | $8M | −108,779 | −$8M |
Filings history
20 periods · normalized AUM · open a period for holdings
| Period | Holdings | AUM | QoQ | Form | Filed | Filing ID |
|---|---|---|---|---|---|---|
| 2026 Q2 | 37 | $1.1B | +113.7% | 13F-HR | 8/13/2026 | 000101359426000886 |
| 2026 Q1 | 28 | $524M | −17.9% | 13F-HR | 5/14/2026 | 000101359426000581 |
| 2025 Q4 | 26 | $638M | +2.7% | 13F-HR | 2/17/2026 | 000101359426000239 |
| 2025 Q3 | 20 | $621M | −17.4% | 13F-HR | 11/13/2025 | 000101359425001398 |
| 2025 Q2 | 24 | $752M | +96.3% | 13F-HR | 8/13/2025 | 000101359425000992 |
| 2025 Q1 | 14 | $383M | −43.5% | 13F-HR | 5/14/2025 | 000101359425000645 |
| 2024 Q4 | 19 | $678M | −5.2% | 13F-HR | 2/13/2025 | 000101359425000260 |
| 2024 Q3 | 19 | $715M | +15.3% | 13F-HR | 11/13/2024 | 000101359424000941 |
| 2024 Q2 | 22 | $620M | +38.1% | 13F-HR | 8/13/2024 | 000101359424000640 |
| 2024 Q1 | 18 | $449M | −17.9% | 13F-HR | 5/14/2024 | 000101359424000471 |
| 2023 Q4 | 23 | $547M | +8.7% | 13F-HR | 2/13/2024 | 000101359424000153 |
| 2023 Q3 | 16 | $503M | +25.4% | 13F-HR | 11/13/2023 | 000101359423000910 |
| 2023 Q2 | 15 | $401M | −9.5% | 13F-HR | 8/11/2023 | 000101359423000659 |
| 2023 Q1 | 27 | $443M | +8.6% | 13F-HR | 5/12/2023 | 000101359423000466 |
| 2022 Q4 | 30 | $408M | +75.1% | 13F-HR | 2/13/2023 | 000101359423000174 |
| 2022 Q3 | 30 | $233M | −33.8% | 13F-HR | 11/14/2022 | 000156761922019714 |
| 2022 Q2 | 35 | $352M | −60.9% | 13F-HR | 8/15/2022 | 000156761922016018 |
| 2022 Q1 | 48 | $901M | — | RESTATEMENT | 7/20/2022 | 000156761922014249 |
| 2022 Q1 | 48 | $901M | −8.6% | 13F-HR | 5/16/2022 | 000156761922010783 |
| 2021 Q4 | 45 | $986M | −30.5% | 13F-HR | 2/14/2022 | 000156761922003912 |
| 2021 Q3 | 57 | $1.4B | — | 13F-HR | 11/15/2021 | 000156761921020217 |
About
Shannon River Fund Management LLC
21 processed 13Fs on this site · 2021 Q3–2026 Q2