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
| DT - Dynatrace | 10.06% | Reduce −1.5% | 1,644,018 | $60.35 | $99M | −24,720 | −$19M |
| FLEX - Flextronics | 9.82% | Add +0.8% | 5,282,186 | $18.33 | $97M | +41,000 | +$4M |
| GDDY - Godaddy · CL A | 7.09% | Add +11.9% | 823,857 | $84.86 | $70M | +87,618 | +$19M |
| Knowbe4 · CL A | 7.07% | New | 3,039,798 | $22.94 | $70M | +3,039,798 | +$70M |
| WMG - Warner Music Group · CL A | 6.09% | Reduce −22.5% | 1,389,712 | $43.18 | $60M | −403,021 | −$17M |
| FIVN - FIVE9 | 5.96% | New | 428,016 | $137.32 | $59M | +428,016 | +$59M |
| MANH - Manhattan Associates | 5.88% | Add +16.7% | 373,006 | $155.49 | $58M | +53,300 | +$9M |
| DOCN - Digitalocean | 5.17% | Reduce −10.6% | 634,482 | $80.33 | $51M | −74,953 | −$4M |
| IDCC - Interdigital | 5.01% | Reduce −2.3% | 689,558 | $71.63 | $49M | −16,531 | +$2M |
| SFM - Sprout Social · CL A | 4.71% | Reduce −13.7% | 512,025 | $90.69 | $46M | −81,600 | −$26M |
| GTM - Zoominfo Technologies · CL A | 4.43% | Reduce −30.8% | 680,821 | $64.20 | $44M | −303,181 | −$17M |
| SONO - Sonos | 3.66% | Add +41.8% | 1,211,962 | $29.80 | $36M | +357,000 | +$8M |
| Holding | 3.36% | Reduce −0.2% | 1,675,843 | $19.79 | $33M | −3,276 | −$2M |
| NYT - New York Times · CL A | 3.15% | Reduce −0.1% | 642,600 | $48.30 | $31M | −846 | −$665K |
| RMBS - Rambus Del | 2.78% | Add +26.2% | 930,973 | $29.39 | $27M | +193,000 | +$11M |
| UBER - UBER Technologies | 2.51% | Reduce −44.5% | 589,100 | $41.93 | $25M | −472,900 | −$23M |
| AMBA - Ambarella | 2.48% | Reduce −43.3% | 120,560 | $202.89 | $24M | −91,997 | −$9M |
| ADSK - Autodesk | 2.29% | Reduce −32.0% | 80,375 | $281.19 | $23M | −37,872 | −$11M |
| Holding · CL A | 1.27% | Hold | 1,275,351 | $9.84 | $13M | — | — |
| IAC - Iac Interactivecorp | 0.95% | Add +5.9% | 71,986 | $130.71 | $9M | +4,037 | +$556K |
| Silicon Laboratories | 0.68% | Reduce −68.7% | 32,238 | $206.43 | $7M | −70,762 | −$8M |
| Supernova Partners Acquistn | 0.67% | Hold | 600,000 | $10.96 | $7M | — | — |
| INTU - Intuit | 0.64% | New | 9,739 | $643.19 | $6M | +9,739 | +$6M |
| Cascade Acquisition · CL A | 0.50% | Hold | 500,000 | $9.94 | $5M | — | — |
| ZS - Zscaler | 0.49% | New | 14,889 | $321.31 | $5M | +14,889 | +$5M |
| Macondray Cap Acquisitn · CLASS A | 0.48% | New | 475,000 | $9.98 | $5M | +475,000 | +$5M |
| Sps Comm | 0.45% | Reduce −87.1% | 31,306 | $142.34 | $4M | −211,020 | −$35M |
| Instructure | 0.44% | Hold | 182,363 | $23.98 | $4M | — | — |
| OKTA - OKTA Inc · CL A | 0.37% | New | 16,084 | $224.20 | $4M | +16,084 | +$4M |
| S - Sentinelone · CL A | 0.35% | New | 68,574 | $50.49 | $3M | +68,574 | +$3M |
| Zendesk | 0.35% | New | 32,959 | $104.28 | $3M | +32,959 | +$3M |
| Holding · CL A | 0.25% | New | 250,000 | $9.90 | $2M | +250,000 | +$2M |
| Holding · CL A | 0.20% | Hold | 200,000 | $9.76 | $2M | — | — |
| Innovid | 0.01% | New | 20,000 | $6.65 | $133K | +20,000 | +$133K |
| Class Acceleration | 0.00% | 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 Q3
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| COUR - Coursera | 2.68% | Exit | 0 | $31.65 | $38M | −1,201,635 | −$38M |
| PRTSEUR - Carparts | 1.49% | Exit | 0 | $15.61 | $21M | −1,355,632 | −$21M |
| Lightspeed Pos | 1.43% | Exit | 0 | $96.43 | $20M | −210,000 | −$20M |
| Smartsheet · CL A | 1.40% | Exit | 0 | $68.82 | $20M | −287,983 | −$20M |
| Pegasystems | 1.20% | Exit | 0 | $127.10 | $17M | −134,411 | −$17M |
| TCOM - Tripadvisor | 0.99% | Exit | 0 | $33.85 | $14M | −414,188 | −$14M |
| ACVA - Acv Auctions · CL A | 0.90% | Exit | 0 | $17.89 | $13M | −714,355 | −$13M |
| RUN - Sunrun | 0.88% | Exit | 0 | $44.00 | $12M | −282,150 | −$12M |
| TTWO - Take Two | 0.69% | Exit | 0 | $154.06 | $10M | −63,500 | −$10M |
| Zynga · CL A | 0.64% | Exit | 0 | $7.53 | $9M | −1,196,800 | −$9M |
| EVTC - Evertec | 0.39% | Exit | 0 | $45.72 | $6M | −120,564 | −$6M |
| Macondray Cap Acquisitn | 0.33% | Exit | 0 | $9.98 | $5M | −475,000 | −$5M |
| RSVR - Reservoir Media | 0.25% | Exit | 0 | $9.11 | $3M | −383,417 | −$3M |
| 890 5th Ave Partners · CL A | 0.21% | Exit | 0 | $9.91 | $3M | −300,000 | −$3M |
| Holding | 0.17% | Exit | 0 | $9.88 | $2M | −250,000 | −$2M |
| SNAP — · CL A | 0.10% | Exit | 0 | $73.85 | $1M | −19,039 | −$1M |
| WDAY - Workday · CL A | 0.07% | Exit | 0 | $250.00 | $1M | −4,128 | −$1M |
| TEAM - Atlassian · CL A | 0.04% | Exit | 0 | $391.14 | $636K | −1,626 | −$636K |
| Ion Acquisition 2 | 0.01% | Exit | 0 | $10.00 | $200K | −20,000 | −$200K |
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