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
| FLEX - Flextronics | 11.16% | Reduce −24.9% | 2,149,870 | $23.01 | $49M | −711,159 | −$12M |
| IDCC - Interdigital | 10.57% | Add +30.7% | 642,638 | $72.90 | $47M | +150,890 | +$23M |
| NICE — | 10.27% | Add +242.6% | 199,029 | $228.89 | $46M | +140,929 | +$34M |
| NVDA - Nvidia | 10.04% | Add +63.9% | 160,241 | $277.77 | $45M | +62,496 | +$30M |
| Activision Blizzard | 9.67% | New | 500,857 | $85.59 | $43M | +500,857 | +$43M |
| DT - Dynatrace | 8.77% | Add +41.7% | 918,882 | $42.30 | $39M | +270,415 | +$14M |
| AMD - Advanced Micro Devices | 8.58% | Add +358.3% | 388,221 | $98.01 | $38M | +303,521 | +$33M |
| Alteryx · CL A | 5.15% | Add +48.0% | 387,894 | $58.84 | $23M | +125,843 | +$10M |
| CGNX - Cognex | 4.07% | Reduce −27.3% | 364,669 | $49.55 | $18M | −136,758 | −$6M |
| CRM - Salesforce | 3.77% | Add +209.6% | 83,605 | $199.78 | $17M | +56,605 | +$13M |
| MANH - Manhattan Associates | 3.58% | Reduce −49.1% | 102,646 | $154.85 | $16M | −99,068 | −$9M |
| PSTG - Pure Storage · CL A | 2.73% | New | 474,500 | $25.51 | $12M | +474,500 | +$12M |
| BSY - Bentley Sys · CL B | 1.99% | Add +116.0% | 205,245 | $42.99 | $9M | +110,245 | +$5M |
| AGYS - Agilysys | 1.86% | New | 100,085 | $82.51 | $8M | +100,085 | +$8M |
| LZ - Legalzoom | 1.75% | New | 827,697 | $9.38 | $8M | +827,697 | +$8M |
| APPF - Appfolio · CL A | 1.59% | Reduce −53.0% | 56,565 | $124.48 | $7M | −63,872 | −$6M |
| Solarwinds | 1.49% | New | 768,430 | $8.60 | $7M | +768,430 | +$7M |
| Informatica · CL A | 1.41% | New | 382,539 | $16.40 | $6M | +382,539 | +$6M |
| FOUR - Shift4 Pmts · CL A | 1.08% | Reduce −84.6% | 62,947 | $75.80 | $5M | −345,913 | −$18M |
| ACVA - Acv Auctions · CL A | 0.46% | New | 157,000 | $12.91 | $2M | +157,000 | +$2M |
| Innovid | 0.01% | Hold | 20,000 | $1.41 | $28K | — | — |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2022 Q4
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| VICR - Vicor | 5.25% | Exit | 0 | $53.75 | $21M | −398,018 | −$21M |
| Pegasystems | 3.91% | Exit | 0 | $34.24 | $16M | −465,742 | −$16M |
| WMG - Warner Music Group · CL A | 2.49% | Exit | 0 | $35.02 | $10M | −289,558 | −$10M |
| UBER - UBER Technologies | 1.70% | Exit | 0 | $24.73 | $7M | −280,125 | −$7M |
| Macondray Cap Acquisitn | 1.15% | Exit | 0 | $9.87 | $5M | −475,000 | −$5M |
| Kornit Digital | 0.86% | Exit | 0 | $22.97 | $3M | −152,234 | −$3M |
| Holding | 0.62% | Exit | 0 | $10.08 | $3M | −250,000 | −$3M |
| Holding · CL A | 0.50% | Exit | 0 | $10.10 | $2M | −200,000 | −$2M |
| Groupon | 0.45% | Exit | 0 | $8.58 | $2M | −214,572 | −$2M |
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