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 | 9.36% | Add +6.5% | 472,152 | $141.63 | $67M | +28,693 | +$15M |
| CWAN — · CL A | 8.65% | Add +15.5% | 2,448,779 | $25.25 | $62M | +327,861 | +$23M |
| TSEM - Tower Semiconductor | 8.29% | Reduce −32.5% | 1,338,215 | $44.26 | $59M | −645,135 | −$19M |
| Pegasystems | 8.06% | New | 788,367 | $73.09 | $58M | +788,367 | +$58M |
| MRVL - Marvell Technology | 7.03% | Add +7.9% | 696,804 | $72.12 | $50M | +50,792 | +$5M |
| WIX — | 6.93% | Reduce −3.4% | 296,411 | $167.17 | $50M | −10,424 | +$743K |
| CGNX - Cognex | 6.06% | Reduce −12.8% | 1,068,933 | $40.50 | $43M | −156,519 | −$14M |
| FLEX - Flextronics | 5.97% | Add +2.7% | 1,277,261 | $33.43 | $43M | +33,286 | +$6M |
| Informatica · CL A | 5.67% | Add +318.3% | 1,601,803 | $25.28 | $40M | +1,218,836 | +$29M |
| ADBE - Adobe | 5.61% | Add +69.8% | 77,379 | $517.78 | $40M | +31,816 | +$15M |
| GWRE - Guidewire Software | 4.07% | Reduce −20.3% | 159,071 | $182.94 | $29M | −40,442 | +$2M |
| CLS - Celestica | 3.96% | New | 553,425 | $51.12 | $28M | +553,425 | +$28M |
| DT - Dynatrace | 3.75% | Reduce −10.3% | 501,536 | $53.47 | $27M | −57,406 | +$2M |
| PYPL - Paypal | 3.04% | New | 278,900 | $78.03 | $22M | +278,900 | +$22M |
| CART - Maplebear | 2.51% | Reduce −21.9% | 440,336 | $40.74 | $18M | −123,156 | −$171K |
| Squarespace · CLASS A | 1.72% | Add +6.4% | 264,360 | $46.43 | $12M | +16,015 | +$1M |
| TALK - Talkspace | 1.43% | Add +2.3% | 4,899,355 | $2.09 | $10M | +110,906 | −$774K |
| UTI - Universal Technical Inst | 0.47% | New | 207,722 | $16.26 | $3M | +207,722 | +$3M |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2024 Q2
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| NVDA - Nvidia | 8.22% | Exit | 0 | $123.54 | $51M | −412,710 | −$51M |
| VRNS - Varonis Sys | 2.54% | Exit | 0 | $47.97 | $16M | −329,082 | −$16M |
| APPN - Appian · CL A | 2.29% | Exit | 0 | $30.86 | $14M | −460,060 | −$14M |
| SFM - Sprout Social · CL A | 1.69% | Exit | 0 | $35.68 | $10M | −293,621 | −$10M |
| MU - Micron Technology | 0.22% | Exit | 0 | $131.54 | $1M | −10,263 | −$1M |
| AVGO - Broadcom | 0.18% | Exit | 0 | $160.51 | $1M | −7,040 | −$1M |
| CRWD - Crowdstrike · CL A | 0.15% | Exit | 0 | $382.99 | $941K | −2,457 | −$941K |
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