U.S. investors are increasingly worried about a major correction as AI supercharges market concentration and turns major benchmarks into directional bets. Morgan Stanley estimates the top 10 U.S. stocks account for 33% of overall value (37.5% of the MSCI USA index). RBC adds that in S&P 500 index funds, more than $40 of every $100 is effectively tied to just 10 companies, creating a “passive concentration trap.” The risk is a disorderly rout if mega-cap AI earnings and guidance disappoint—though AI doesn’t need to fail entirely.
AI-linked companies have surged from nearly a quarter to 45% of the S&P 500’s market cap since ChatGPT’s launch, led by majors like Microsoft, Nvidia, Amazon, Alphabet and Meta. The momentum is now mirrored in fixed income: AI-linked investment-grade debt has grown to $1.4 trillion, 15.4% of US credit—raising the stakes for market concentration risk.
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