Alta Park Capital, LP
Alta Park Capital, LP declares $808.3M in 17 of the 220 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 74.1% of its $1.1B 13F portfolio. Largest positions: Sandisk (0.04% of the company) and Western Digital (0.04% of the company). Over time: $808.3M in 17 of these companies for Q2 2026, against $41.5M in 2 for Q4 2019 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $309.1M and sold $150.8M of these stocks, at the quarter's prices: a net purchase of $158.3M; 7 new positions and 4 sold out.
Performance of its AI picks
The AI-stock portfolio Alta Park Capital, LP declared for Q2 2026 (Form 13F), held unchanged, returned -11.0% in Q3 2026 (SMH -7.1%), ranked 1653 of 1,776 active managers. Over the last 12 months, quarter after quarter: +151.4% (SMH +87.2%), ranked 5 of 1,356 active managers. Over three years, quarter after quarter: +437.6% (SMH +325.8%). Over five years, quarter after quarter: +418.8% (SMH +389.8%). Trades made during a quarter are not visible in 13F filings: this measures its declared picks, not the return of its funds.
Largest positions
- Sandisk (SNDK) — $118.5M: 52,132 shares, 0.04% of the company, 10.9% of its portfolio; held since Q3 2025
- Western Digital (WDC) — $87.0M: 136,238 shares, 0.04% of the company, 8.0% of its portfolio (added this quarter); held since Q2 2025
- Marvell (MRVL) — $63.7M: 213,865 shares, 0.02% of the company, 5.8% of its portfolio (new position this quarter)
- Applied Materials (AMAT) — $60.4M: 83,541 shares, 0.01% of the company, 5.5% of its portfolio (trimmed this quarter); held since Q3 2025
- Teradyne (TER) — $58.4M: 120,779 shares, 0.08% of the company, 5.4% of its portfolio (added this quarter); held since Q3 2025
- AMD (AMD) — $57.5M: 99,017 shares, 0.01% of the company, 5.3% of its portfolio (new position this quarter)
- Palo Alto Networks (PANW) — $54.8M: 160,554 shares, 0.02% of the company, 5.0% of its portfolio; held since Q2 2020
- Semtech (SMTC) — $41.7M: 257,938 shares, 0.28% of the company, 3.8% of its portfolio (new position this quarter)
- GlobalFoundries (GFS) — $38.8M: 471,201 shares, 0.08% of the company, 3.6% of its portfolio (new position this quarter)
- ASML (ASML) — $38.4M: 19,310 shares, 0.01% of the company, 3.5% of its portfolio (trimmed this quarter); held since Q4 2025
- STMicroelectronics (STM) — $38.0M: 506,977 shares, 0.06% of the company, 3.5% of its portfolio (new position this quarter)
- Tower Semiconductor (TSEM) — $34.2M: 131,216 shares, 0.12% of the company, 3.1% of its portfolio (trimmed this quarter); held since Q4 2025
- NVIDIA (NVDA) — $31.6M: 157,820 shares, 0.00% of the company, 2.9% of its portfolio (trimmed this quarter); held since Q1 2023
- Datadog (DDOG) — $24.2M: 92,914 shares, 0.03% of the company, 2.2% of its portfolio (new position this quarter)
- Snowflake (SNOW) — $24.2M: 94,966 shares, 0.03% of the company, 2.2% of its portfolio (new position this quarter)
By sector
- Chips & compute — $263.8M, 33% of its AI holdings, 6 companies
- Memory & storage — $205.6M, 25% of its AI holdings, 2 companies
- Equipment & test — $157.3M, 19% of its AI holdings, 3 companies
- AI software — $103.1M, 13% of its AI holdings, 3 companies
- Interconnect — $41.7M, 5% of its AI holdings, 1 company
- Cloud & AI giants — $23.8M, 3% of its AI holdings, 1 company
- Optics — $13.0M, 2% of its AI holdings, 1 company
Biggest changes this quarter
- opened a position in Marvell (MRVL): +$63.7M at the quarter's price
- opened a position in AMD (AMD): +$57.5M at the quarter's price
- opened a position in Semtech (SMTC): +$41.7M at the quarter's price
- opened a position in GlobalFoundries (GFS): +$38.8M at the quarter's price
- opened a position in STMicroelectronics (STM): +$38.0M at the quarter's price
- sold out of Apple (AAPL): -$37.3M at the quarter's price
- opened a position in Datadog (DDOG): +$24.2M at the quarter's price
- opened a position in Snowflake (SNOW): +$24.2M at the quarter's price
- trimmed Coherent (COHR): -$24.1M at the quarter's price
- sold out of Lumentum (LITE): -$22.5M at the quarter's price