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
Latest book
| TSEM - Tower Semiconductor | 8.91% | Reduce −24.1% | 382,933 | $260.64 | $100M | −121,306 | +$11M |
| FLEX - Flextronics | 5.49% | Add +22.0% | 379,834 | $162.07 | $62M | +68,611 | +$41M |
| AMD - Advanced Micro Devices | 5.48% | New | 105,751 | $580.91 | $61M | +105,751 | +$61M |
| IDCC - Interdigital | 4.66% | Add +240.8% | 184,388 | $283.13 | $52M | +130,284 | +$36M |
| CLS - Celestica | 4.56% | Add +161.6% | 139,964 | $364.80 | $51M | +86,469 | +$36M |
| COHR - Coherent | 4.55% | Add +47.1% | 129,283 | $394.47 | $51M | +41,378 | +$30M |
| HNGE — · CL A | 4.16% | Add +34.5% | 561,224 | $83.00 | $47M | +144,042 | +$30M |
| EXTR - Extreme Networks | 4.11% | Add +8.5% | 1,424,095 | $32.37 | $46M | +111,034 | +$26M |
| KLIC - Kulicke & Soffa Inds | 4.00% | New | 334,781 | $133.76 | $45M | +334,781 | +$45M |
| TWLO - Twilio · CL A | 3.71% | New | 201,352 | $206.33 | $42M | +201,352 | +$42M |
| CIEN - Ciena | 3.56% | New | 81,298 | $490.56 | $40M | +81,298 | +$40M |
| LYV - Live Nation | 3.53% | Reduce −26.6% | 216,037 | $183.11 | $40M | −78,361 | −$5M |
| RMBS - Rambus Del | 3.46% | Reduce −12.6% | 291,713 | $132.74 | $39M | −42,104 | +$10M |
| QNT - Quantinuum · CL A | 3.42% | New | 469,355 | $81.74 | $38M | +469,355 | +$38M |
| UTI - Universal Technical Inst | 3.40% | New | 890,113 | $42.77 | $38M | +890,113 | +$38M |
| ABNB - Airbnb · CL A | 3.17% | Add +0.3% | 247,836 | $143.10 | $35M | +830 | +$4M |
| TTWO - Take Two | 3.08% | New | 138,029 | $249.98 | $35M | +138,029 | +$35M |
| Ouster | 2.51% | New | 449,264 | $62.52 | $28M | +449,264 | +$28M |
| Pdf Solutions | 2.34% | New | 369,776 | $70.79 | $26M | +369,776 | +$26M |
| NOK - Nokia | 2.26% | New | 1,906,902 | $13.28 | $25M | +1,906,902 | +$25M |
| ALNT - Allient | 2.02% | New | 220,237 | $102.93 | $23M | +220,237 | +$23M |
| RKLB - Rocket Lab | 2.01% | New | 221,143 | $101.65 | $22M | +221,143 | +$22M |
| FFIV - F5 | 1.90% | Add +2.1% | 51,258 | $415.96 | $21M | +1,062 | +$7M |
| DY - Dycom Inds | 1.78% | New | 39,473 | $505.59 | $20M | +39,473 | +$20M |
| CIFR - Cipher Digital | 1.46% | New | 667,931 | $24.50 | $16M | +667,931 | +$16M |
| LION - Lionsgate Studios | 1.44% | Add +0.9% | 1,050,445 | $15.31 | $16M | +9,511 | +$6M |
| DLR - Digital Rlty Tr | 1.42% | Add +197.5% | 88,764 | $179.58 | $16M | +58,926 | +$11M |
| GWRE - Guidewire Software | 1.24% | Add +80.1% | 113,230 | $123.05 | $14M | +50,367 | +$5M |
| SPHR - Sphere Entertainment · CL A | 1.14% | Add +0.7% | 73,878 | $173.03 | $13M | +533 | +$4M |
| GLBE - Global-E Online | 1.09% | New | 353,200 | $34.73 | $12M | +353,200 | +$12M |
| AMPX - Amprius Technologies | 1.04% | New | 838,887 | $13.86 | $12M | +838,887 | +$12M |
| APLD - Applied Digital | 0.88% | New | 265,474 | $37.30 | $10M | +265,474 | +$10M |
| NET - Cloudflare · CL A | 0.52% | New | 23,589 | $245.28 | $6M | +23,589 | +$6M |
| AMKR - Amkor Technology | 0.51% | New | 65,895 | $86.23 | $6M | +65,895 | +$6M |
| MU - Micron Technology | 0.46% | New | 4,484 | $1,154 | $5M | +4,484 | +$5M |
| BW — | 0.42% | New | 333,153 | $14.10 | $5M | +333,153 | +$5M |
| Maxlinear | 0.31% | New | 27,377 | $128.03 | $4M | +27,377 | +$4M |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2026 Q1
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| MRVL - Marvell Technology | 10.65% | Exit | 0 | $99.05 | $56M | −563,573 | −$56M |
| AXON - Axon Enterprise | 3.84% | Exit | 0 | $424.69 | $20M | −47,442 | −$20M |
| TOST - Toast · CL A | 3.70% | Exit | 0 | $26.51 | $19M | −732,027 | −$19M |
| LGN - Legence · CL A | 3.64% | Exit | 0 | $56.46 | $19M | −337,638 | −$19M |
| ADTN - Adtran | 2.93% | Exit | 0 | $12.58 | $15M | −1,219,976 | −$15M |
| UUUU - Energy Fuels | 1.77% | Exit | 0 | $18.25 | $9M | −507,555 | −$9M |
| AMBA - Ambarella | 1.13% | Exit | 0 | $51.48 | $6M | −114,940 | −$6M |
| APP - Applovin · CL A | 1.10% | Exit | 0 | $398.00 | $6M | −14,480 | −$6M |
| ALAB - Astera Labs | 0.99% | Exit | 0 | $109.59 | $5M | −47,394 | −$5M |
| OSIS - OSI Systems | 0.98% | Exit | 0 | $265.49 | $5M | −19,274 | −$5M |
| EQIX - Equinix | 0.95% | Exit | 0 | $980.20 | $5M | −5,102 | −$5M |
| PLTR - Palantir Technologies · CL A | 0.81% | Exit | 0 | $146.28 | $4M | −29,150 | −$4M |
| SNOW - Snowflake | 0.76% | Exit | 0 | $150.81 | $4M | −26,377 | −$4M |
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