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
| IDCC - Interdigital | 10.24% | Add +3.9% | 642,265 | $80.24 | $52M | +23,815 | −$8M |
| CLS - Celestica | 8.26% | New | 1,695,139 | $24.52 | $42M | +1,695,139 | +$42M |
| FLEX - Flextronics | 7.97% | Reduce −28.9% | 1,486,661 | $26.98 | $40M | −605,233 | −$18M |
| GDDY - Godaddy · CL A | 5.90% | Reduce −9.3% | 398,889 | $74.48 | $30M | −40,867 | −$3M |
| WIX — | 5.88% | New | 322,326 | $91.80 | $30M | +322,326 | +$30M |
| Alteryx · CL A | 4.63% | Add +2.7% | 618,669 | $37.69 | $23M | +16,414 | −$4M |
| NVDA - Nvidia | 4.46% | Reduce −22.3% | 51,602 | $434.99 | $22M | −14,770 | −$6M |
| DT - Dynatrace | 4.35% | Reduce −2.1% | 468,488 | $46.73 | $22M | −9,867 | −$3M |
| Informatica · CL A | 3.39% | Add +44.9% | 810,391 | $21.07 | $17M | +250,935 | +$7M |
| AMD - Advanced Micro Devices | 2.93% | Reduce −47.6% | 143,471 | $102.82 | $15M | −130,537 | −$16M |
| SFM - Sprout Social · CL A | 2.80% | New | 282,730 | $49.88 | $14M | +282,730 | +$14M |
| MRVL - Marvell Technology | 2.46% | New | 228,700 | $54.13 | $12M | +228,700 | +$12M |
| CWAN — · CL A | 2.32% | New | 603,545 | $19.34 | $12M | +603,545 | +$12M |
| OKTA - OKTA Inc · CL A | 1.59% | New | 98,000 | $81.51 | $8M | +98,000 | +$8M |
| ACIW - Aci Worldwide | 0.39% | New | 87,789 | $22.56 | $2M | +87,789 | +$2M |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2023 Q2
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| NICE — | 12.85% | Exit | 0 | $206.50 | $52M | −249,532 | −$52M |
| Lightspeed Commerce | 6.60% | Exit | 0 | $16.92 | $26M | −1,564,969 | −$26M |
| Activision Blizzard | 4.20% | Exit | 0 | $84.30 | $17M | −199,931 | −$17M |
| CVLT - Commvault Sys | 3.07% | Exit | 0 | $72.62 | $12M | −169,702 | −$12M |
| APPF - Appfolio · CL A | 2.36% | Exit | 0 | $172.14 | $9M | −54,867 | −$9M |
| CRM - Salesforce | 2.22% | Exit | 0 | $211.27 | $9M | −42,136 | −$9M |
| Solarwinds | 0.81% | Exit | 0 | $10.26 | $3M | −316,002 | −$3M |
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