Clear Street Group Inc.

Clear Street Group Inc. declares $26.8B in 87 of the 230 AI and semiconductor companies tracked on Silicon Floor, as of Jun 30, 2026 (Form 13F): 67.8% of its $39.5B 13F portfolio. Largest positions: Sandisk (2.1% of the company) and NVIDIA (0.13% of the company). It is a market maker: its positions are mostly hedges, so they are left out of the quarter's moves on /holders. Over time: $26.8B in 87 of these companies for Q2 2026, against $14.4B in 41 for Q3 2025 (13F values as filed). From Mar 31, 2026 to Jun 30, 2026, it bought $6.9B and sold $1.6B of these stocks, at the quarter's prices: a net purchase of $5.3B; 34 new positions and 4 sold out.

Performance of its AI picks

The AI-stock portfolio Clear Street Group Inc. declared for Q2 2026 (Form 13F), held unchanged, returned -1.9% in Q3 2026 (SMH -7.1%). Over the last 12 months, quarter after quarter: +31.5% (SMH +87.2%). Trades made during a quarter are not visible in 13F filings: this measures its declared picks, not the return of its funds.

Largest positions

1. Sandisk (SNDK): $6.8B, 3.0M shares, 2.1% of the company, 17.2% of its portfolio (added this quarter); held since Q1 2026
2. NVIDIA (NVDA): $6.1B, 30.7M shares, 0.13% of the company, 15.5% of its portfolio (trimmed this quarter); held since Q3 2025
3. AMD (AMD): $2.0B, 3.5M shares, 0.21% of the company, 5.1% of its portfolio (trimmed this quarter); held since Q3 2025
4. Alphabet (GOOGL): $1.3B, 3.6M shares, 0.03% of the company, 3.3% of its portfolio (added this quarter); held since Q3 2025
5. Apple (AAPL): $1.1B, 3.8M shares, 0.03% of the company, 2.8% of its portfolio (trimmed this quarter); held since Q3 2025
6. Microsoft (MSFT): $1.1B, 2.9M shares, 0.04% of the company, 2.7% of its portfolio (added this quarter); held since Q3 2025
7. Nebius (NBIS): $999.4M, 3.6M shares, 1.4% of the company, 2.5% of its portfolio (added this quarter); held since Q3 2025
8. Amazon (AMZN): $987.9M, 4.1M shares, 0.04% of the company, 2.5% of its portfolio (added this quarter); held since Q3 2025
9. Meta Platforms (META): $718.8M, 1.3M shares, 0.05% of the company, 1.8% of its portfolio (trimmed this quarter); held since Q3 2025
10. Western Digital (WDC): $522.4M, 817,892 shares, 0.22% of the company, 1.3% of its portfolio (added this quarter); held since Q1 2026
11. Lumentum (LITE): $502.6M, 585,683 shares, 0.65% of the company, 1.3% of its portfolio (added this quarter); held since Q1 2026
12. Bloom Energy (BE): $301.8M, 996,971 shares, 0.34% of the company, 0.76% of its portfolio (added this quarter); held since Q4 2025
13. Coherent (COHR): $291.9M, 739,976 shares, 0.38% of the company, 0.74% of its portfolio (added this quarter); held since Q1 2026
14. CoreWeave (CRWV): $283.4M, 2.8M shares, 0.51% of the company, 0.72% of its portfolio (trimmed this quarter); held since Q3 2025
15. Palantir (PLTR): $275.6M, 2.4M shares, 0.10% of the company, 0.70% of its portfolio (added this quarter); held since Q3 2025

By sector

• Chips & compute: $8.7B, 33% of its AI holdings, 13 companies
• Memory & storage: $7.4B, 28% of its AI holdings, 4 companies
• Cloud & AI giants: $5.4B, 20% of its AI holdings, 6 companies
• Neoclouds & data centers: $1.5B, 6% of its AI holdings, 11 companies
• Optics: $1.3B, 5% of its AI holdings, 12 companies
• AI software: $605.3M, 2% of its AI holdings, 12 companies
• Power, electrical & cooling: $582.7M, 2% of its AI holdings, 8 companies
• Interconnect: $540.0M, 2% of its AI holdings, 6 companies
• Equipment & test: $417.6M, 2% of its AI holdings, 11 companies
• Servers & systems: $207.9M, 1% of its AI holdings, 4 companies

Biggest changes this quarter

• added to Sandisk (SNDK): +$4.0B at the quarter's price
• trimmed AMD (AMD): -$1.2B at the quarter's price
• added to Western Digital (WDC): +$368.6M at the quarter's price
• trimmed NVIDIA (NVDA): -$223.9M at the quarter's price
• opened a position in Applied Optoelectronics (AAOI): +$182.4M at the quarter's price
• added to Coherent (COHR): +$175.3M at the quarter's price
• added to Nebius (NBIS): +$154.7M at the quarter's price
• opened a position in Marvell (MRVL): +$153.9M at the quarter's price
• added to Lumentum (LITE): +$147.2M at the quarter's price
• added to Corning (GLW): +$129.8M at the quarter's price

Other holders of this size

• Daiwa Securities Group Inc.: $26.4B in 140 of these companies
• NEW YORK STATE TEACHERS RETIREMENT SYSTEM: $27.0B in 152 of these companies
• PUBLIC INVESTMENT FUND: $26.3B in 1 of these companies
• Two Sigma: $27.0B in 220 of these companies
• ROYAL LONDON ASSET MANAGEMENT LTD: $26.3B in 110 of these companies
• DANSKE BANK A/S: $27.1B in 130 of these companies
• JONES FINANCIAL COMPANIES LLLP: $26.1B in 221 of these companies
• Marshall Wace: $27.5B in 181 of these companies

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