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 | 15.06% | Reduce −6.8% | 2,861,029 | $21.46 | $61M | −208,341 | +$10M |
| DT - Dynatrace | 6.09% | New | 648,467 | $38.30 | $25M | +648,467 | +$25M |
| MANH - Manhattan Associates | 6.00% | Add +49.4% | 201,714 | $121.40 | $24M | +66,726 | +$7M |
| IDCC - Interdigital | 5.97% | New | 491,748 | $49.48 | $24M | +491,748 | +$24M |
| CGNX - Cognex | 5.79% | Add +102.4% | 501,427 | $47.11 | $24M | +253,700 | +$13M |
| FOUR - Shift4 Pmts · CL A | 5.61% | New | 408,860 | $55.93 | $23M | +408,860 | +$23M |
| VICR - Vicor | 5.25% | New | 398,018 | $53.75 | $21M | +398,018 | +$21M |
| Pegasystems | 3.91% | New | 465,742 | $34.24 | $16M | +465,742 | +$16M |
| NVDA - Nvidia | 3.50% | New | 97,745 | $146.14 | $14M | +97,745 | +$14M |
| Alteryx · CL A | 3.26% | Add +37.2% | 262,051 | $50.67 | $13M | +71,081 | +$3M |
| APPF - Appfolio · CL A | 3.11% | New | 120,437 | $105.38 | $13M | +120,437 | +$13M |
| NICE — | 2.74% | Reduce −61.8% | 58,100 | $192.30 | $11M | −93,880 | −$17M |
| WMG - Warner Music Group · CL A | 2.49% | Reduce −16.2% | 289,558 | $35.02 | $10M | −56,138 | +$2M |
| UBER - UBER Technologies | 1.70% | Reduce −28.7% | 280,125 | $24.73 | $7M | −112,803 | −$3M |
| AMD - Advanced Micro Devices | 1.35% | New | 84,700 | $64.77 | $5M | +84,700 | +$5M |
| Macondray Cap Acquisitn | 1.15% | Hold | 475,000 | $9.87 | $5M | — | — |
| CRM - Salesforce | 0.88% | Reduce −80.8% | 27,000 | $132.59 | $4M | −113,464 | −$17M |
| BSY - Bentley Sys · CL B | 0.86% | New | 95,000 | $36.96 | $4M | +95,000 | +$4M |
| Kornit Digital | 0.86% | Reduce −34.3% | 152,234 | $22.97 | $3M | −79,400 | −$3M |
| Holding | 0.62% | Hold | 250,000 | $10.08 | $3M | — | — |
| Holding · CL A | 0.50% | Hold | 200,000 | $10.10 | $2M | — | — |
| Groupon | 0.45% | New | 214,572 | $8.58 | $2M | +214,572 | +$2M |
| Innovid | 0.01% | Hold | 20,000 | $1.71 | $34K | — | — |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2022 Q3
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| RMBS - Rambus Del | 8.08% | Exit | 0 | $25.42 | $19M | −739,988 | −$19M |
| GTM - Zoominfo Technologies · CL A | 7.04% | Exit | 0 | $41.66 | $16M | −393,680 | −$16M |
| FIVN - FIVE9 | 5.08% | Exit | 0 | $74.98 | $12M | −157,696 | −$12M |
| MTCH - Match Group | 2.99% | Exit | 0 | $47.75 | $7M | −146,049 | −$7M |
| AMBA - Ambarella | 1.96% | Exit | 0 | $56.18 | $5M | −81,173 | −$5M |
| TSLA - Tesla | 0.24% | Exit | 0 | $265.24 | $557K | −2,100 | −$557K |
| Taboola | 0.19% | Exit | 0 | $1.81 | $449K | −248,339 | −$449K |
| Class Acceleration | 0.02% | Exit | 0 | $9.80 | $49K | −5,000 | −$49K |
| Holding | — | Exit | 0 | $10.00 | $10K | −1,000 | −$10K |
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