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 | 8.10% | Reduce −25.5% | 3,934,809 | $18.55 | $73M | −1,347,377 | −$24M |
| MANH - Manhattan Associates | 7.19% | Add +25.3% | 467,207 | $138.71 | $65M | +94,201 | +$7M |
| DT - Dynatrace | 6.64% | Reduce −22.6% | 1,271,689 | $47.10 | $60M | −372,329 | −$39M |
| NYT - New York Times · CL A | 5.81% | Add +77.9% | 1,143,070 | $45.84 | $52M | +500,470 | +$21M |
| GTM - Zoominfo Technologies · CL A | 4.15% | Reduce −8.0% | 626,622 | $59.74 | $37M | −54,199 | −$6M |
| NICE — | 3.89% | New | 160,184 | $219.00 | $35M | +160,184 | +$35M |
| Pegasystems | 3.63% | New | 406,289 | $80.65 | $33M | +406,289 | +$33M |
| WMG - Warner Music Group · CL A | 3.49% | Reduce −40.3% | 830,236 | $37.85 | $31M | −559,476 | −$29M |
| SONO - Sonos | 3.47% | Reduce −8.6% | 1,107,714 | $28.22 | $31M | −104,248 | −$5M |
| DOCN - Digitalocean | 3.44% | Reduce −15.5% | 535,888 | $57.85 | $31M | −98,594 | −$20M |
| IDCC - Interdigital | 3.37% | Reduce −31.0% | 475,889 | $63.80 | $30M | −213,669 | −$19M |
| Holding | 3.19% | Reduce −12.2% | 1,471,189 | $19.57 | $29M | −204,654 | −$4M |
| UBER - UBER Technologies | 3.14% | Add +34.6% | 792,843 | $35.68 | $28M | +203,743 | +$4M |
| Elastic | 2.81% | New | 284,287 | $88.95 | $25M | +284,287 | +$25M |
| RMBS - Rambus Del | 2.77% | Reduce −16.0% | 781,855 | $31.89 | $25M | −149,118 | −$2M |
| FIVN - FIVE9 | 2.66% | Reduce −49.2% | 217,538 | $110.40 | $24M | −210,478 | −$35M |
| FLYW - Flywire | 2.11% | New | 622,474 | $30.58 | $19M | +622,474 | +$19M |
| MTCH - Match Group | 2.07% | New | 171,800 | $108.74 | $19M | +171,800 | +$19M |
| Farfetch · CL A | 2.01% | New | 1,197,429 | $15.12 | $18M | +1,197,429 | +$18M |
| GDDY - Godaddy · CL A | 2.01% | Reduce −73.7% | 216,282 | $83.70 | $18M | −607,575 | −$52M |
| IAC - Iac Interactivecorp | 1.63% | Add +17412.5% | 12,606,559 | $1.16 | $15M | +12,534,573 | +$5M |
| Holding · CL A | 1.40% | Hold | 1,275,351 | $9.90 | $13M | — | — |
| V - VISA · CL A | 1.27% | New | 51,536 | $221.77 | $11M | +51,536 | +$11M |
| ADSK - Autodesk | 1.20% | Reduce −37.3% | 50,369 | $214.36 | $11M | −30,006 | −$12M |
| SFM - Sprout Social · CL A | 1.00% | Reduce −78.1% | 112,011 | $80.12 | $9M | −400,014 | −$37M |
| Knowbe4 · CL A | 0.98% | Reduce −87.4% | 383,655 | $23.02 | $9M | −2,656,143 | −$61M |
| AMBA - Ambarella | 0.85% | Reduce −39.6% | 72,786 | $104.92 | $8M | −47,774 | −$17M |
| Cascade Acquisition · CL A | 0.56% | Add +0.4% | 501,966 | $10.08 | $5M | +1,966 | +$90K |
| Macondray Cap Acquisitn | 0.53% | New | 475,000 | $10.00 | $5M | +475,000 | +$5M |
| Silicon Laboratories | 0.49% | Reduce −9.0% | 29,338 | $150.21 | $4M | −2,900 | −$2M |
| Zendesk | 0.39% | Reduce −10.4% | 29,520 | $120.29 | $4M | −3,439 | +$114K |
| Instructure | 0.35% | Reduce −13.2% | 158,353 | $20.06 | $3M | −24,010 | −$1M |
| Holding | 0.27% | New | 250,000 | $9.78 | $2M | +250,000 | +$2M |
| Holding · CL A | 0.22% | Hold | 200,000 | $9.88 | $2M | — | — |
| Innovid | 0.01% | Hold | 20,000 | $6.05 | $121K | — | — |
| Class Acceleration | 0.01% | Hold | 5,000 | $9.80 | $49K | — | — |
| Holding | 0.00% | Hold | 1,000 | $10.00 | $10K | — | — |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2021 Q4
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| Supernova Partners Acquistn | 0.67% | Exit | 0 | $10.96 | $7M | −600,000 | −$7M |
| INTU - Intuit | 0.64% | Exit | 0 | $643.19 | $6M | −9,739 | −$6M |
| ZS - Zscaler | 0.49% | Exit | 0 | $321.31 | $5M | −14,889 | −$5M |
| Macondray Cap Acquisitn · CLASS A | 0.48% | Exit | 0 | $9.98 | $5M | −475,000 | −$5M |
| Sps Comm | 0.45% | Exit | 0 | $142.34 | $4M | −31,306 | −$4M |
| OKTA - OKTA Inc · CL A | 0.37% | Exit | 0 | $224.20 | $4M | −16,084 | −$4M |
| S - Sentinelone · CL A | 0.35% | Exit | 0 | $50.49 | $3M | −68,574 | −$3M |
| Holding · CL A | 0.25% | Exit | 0 | $9.90 | $2M | −250,000 | −$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