U.S. Stock Indexes Show High AI Concentration; Nasdaq 100 Top 10 Firms Account for 67% on July 26

According to Motley Fool on July 26, U.S. stock indexes display significant concentration risks similar to South Korean markets. The S&P 500's top 14 companies account for approximately 45% of the index's market capitalization, while Nasdaq 100's top 10 firms represent over 67% of that index. Both the top 10 Nasdaq 100 firms and the top 9 S&P 500 companies heavily rely on artificial intelligence as a core business strategy. Separately, leveraged and inverse ETFs constituted 31% of all new ETF launches in the U.S. during the first half of 2026, up from 22% in 2025. Zero-day-to-expiration (0DTE) options now account for 48% of retail investor options trading volume, triple the levels observed in early 2022.
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