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 | 14.89% | Reduce −3.8% | 618,450 | $96.55 | $60M | −24,188 | +$13M |
| FLEX - Flextronics | 14.42% | Reduce −2.7% | 2,091,894 | $27.64 | $58M | −57,976 | +$8M |
| NICE — | 12.85% | Add +25.4% | 249,532 | $206.50 | $52M | +50,503 | +$6M |
| GDDY - Godaddy · CL A | 8.24% | New | 439,756 | $75.13 | $33M | +439,756 | +$33M |
| AMD - Advanced Micro Devices | 7.78% | Reduce −29.4% | 274,008 | $113.91 | $31M | −114,213 | −$7M |
| NVDA - Nvidia | 7.00% | Reduce −58.6% | 66,372 | $423.02 | $28M | −93,869 | −$16M |
| Alteryx · CL A | 6.82% | Add +55.3% | 602,255 | $45.40 | $27M | +214,361 | +$5M |
| Lightspeed Commerce | 6.60% | New | 1,564,969 | $16.92 | $26M | +1,564,969 | +$26M |
| DT - Dynatrace | 6.14% | Reduce −47.9% | 478,355 | $51.47 | $25M | −440,527 | −$14M |
| Activision Blizzard | 4.20% | Reduce −60.1% | 199,931 | $84.30 | $17M | −300,926 | −$26M |
| CVLT - Commvault Sys | 3.07% | New | 169,702 | $72.62 | $12M | +169,702 | +$12M |
| Informatica · CL A | 2.58% | Add +46.2% | 559,456 | $18.50 | $10M | +176,917 | +$4M |
| APPF - Appfolio · CL A | 2.36% | Reduce −3.0% | 54,867 | $172.14 | $9M | −1,698 | +$2M |
| CRM - Salesforce | 2.22% | Reduce −49.6% | 42,136 | $211.26 | $9M | −41,469 | −$8M |
| Solarwinds | 0.81% | Reduce −58.9% | 316,002 | $10.26 | $3M | −452,428 | −$3M |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2023 Q1
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| CGNX - Cognex | 4.07% | Exit | 0 | $49.55 | $18M | −364,669 | −$18M |
| MANH - Manhattan Associates | 3.58% | Exit | 0 | $154.85 | $16M | −102,646 | −$16M |
| PSTG - Pure Storage · CL A | 2.73% | Exit | 0 | $25.51 | $12M | −474,500 | −$12M |
| BSY - Bentley Sys · CL B | 1.99% | Exit | 0 | $42.99 | $9M | −205,245 | −$9M |
| AGYS - Agilysys | 1.86% | Exit | 0 | $82.51 | $8M | −100,085 | −$8M |
| LZ - Legalzoom | 1.75% | Exit | 0 | $9.38 | $8M | −827,697 | −$8M |
| FOUR - Shift4 Pmts · CL A | 1.08% | Exit | 0 | $75.79 | $5M | −62,947 | −$5M |
| ACVA - Acv Auctions · CL A | 0.46% | Exit | 0 | $12.91 | $2M | −157,000 | −$2M |
| Innovid | 0.01% | Exit | 0 | $1.40 | $28K | −20,000 | −$28K |
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