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
| TSEM - Tower Semiconductor | 11.10% | Reduce −37.3% | 602,804 | $117.42 | $71M | −359,259 | +$1M |
| Pegasystems | 9.73% | Reduce −25.0% | 1,038,832 | $59.72 | $62M | −345,387 | −$18M |
| U - Unity Software | 7.38% | New | 1,065,452 | $44.17 | $47M | +1,065,452 | +$47M |
| LYV - Live Nation | 5.71% | New | 255,433 | $142.50 | $36M | +255,433 | +$36M |
| MRVL - Marvell Technology | 5.03% | Reduce −10.8% | 377,684 | $84.98 | $32M | −45,960 | −$4M |
| EXTR - Extreme Networks | 4.97% | New | 1,904,528 | $16.65 | $32M | +1,904,528 | +$32M |
| CLS - Celestica | 4.97% | New | 107,130 | $295.61 | $32M | +107,130 | +$32M |
| COHR - Coherent | 4.86% | Add +88.1% | 167,918 | $184.57 | $31M | +78,662 | +$21M |
| CWAN — · CL A | 4.68% | Add +82.4% | 1,236,412 | $24.12 | $30M | +558,719 | +$18M |
| NCNO - Ncino | 4.57% | Reduce −28.1% | 1,135,922 | $25.64 | $29M | −442,974 | −$14M |
| ALAB - Astera Labs | 4.37% | New | 167,641 | $166.36 | $28M | +167,641 | +$28M |
| GWRE - Guidewire Software | 3.97% | Hold | 126,057 | $201.01 | $25M | — | — |
| KLAC - Klaviyo | 3.72% | New | 729,703 | $32.47 | $24M | +729,703 | +$24M |
| CRDO - Credo Technology | 3.38% | Add +73.2% | 149,966 | $143.89 | $22M | +63,399 | +$9M |
| AMBA - Ambarella | 3.35% | New | 301,093 | $70.84 | $21M | +301,093 | +$21M |
| FLEX - Flextronics | 2.97% | Reduce −63.1% | 313,273 | $60.42 | $19M | −536,143 | −$30M |
| IDCC - Interdigital | 2.67% | Reduce −70.1% | 53,490 | $318.38 | $17M | −125,230 | −$45M |
| LGN - Legence · CL A | 2.26% | New | 334,863 | $43.04 | $14M | +334,863 | +$14M |
| AXON - Axon Enterprise | 1.85% | New | 20,716 | $567.93 | $12M | +20,716 | +$12M |
| HNGE — · CL A | 1.70% | New | 233,354 | $46.45 | $11M | +233,354 | +$11M |
| DOCU - Docusign | 1.68% | Reduce −44.7% | 156,813 | $68.40 | $11M | −126,702 | −$10M |
| CCC — | 1.34% | Hold | 1,075,546 | $7.95 | $9M | — | — |
| QCOM - Qualcomm | 1.24% | New | 46,212 | $171.05 | $8M | +46,212 | +$8M |
| MU - Micron Technology | 0.91% | New | 20,400 | $285.41 | $6M | +20,400 | +$6M |
| PLTR - Palantir Technologies · CL A | 0.81% | Reduce −49.3% | 28,965 | $177.75 | $5M | −28,145 | −$5M |
| WIX — | 0.76% | Reduce −85.8% | 46,731 | $103.89 | $5M | −283,352 | −$54M |
Exits / last held
not current holdings · last reported size, unchanged · gone vs 2025 Q3
| Stock | % of portfolio | Recent activity | Shares | Reported price* | Value | Share change | $ change |
|---|---|---|---|---|---|---|---|
| FROG - Jfrog | 6.58% | Exit | 0 | $47.33 | $41M | −863,924 | −$41M |
| FORM - Formfactor | 5.68% | Exit | 0 | $36.42 | $35M | −968,161 | −$35M |
| CLH - Clean Harbors | 4.33% | Exit | 0 | $232.22 | $27M | −115,870 | −$27M |
| LRN - Stride | 1.99% | Exit | 0 | $148.94 | $12M | −82,928 | −$12M |
| TSM - Taiwan Semiconductor Mfg | 0.39% | Exit | 0 | $279.28 | $2M | −8,701 | −$2M |
| BLZE - Backblaze · CL A | 0.34% | Exit | 0 | $9.28 | $2M | −229,384 | −$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