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Analysis: AI leading stocks pushed the S&P 500 index up 117% during the bull market, with mounting market concentration risk.

2026.10.09 21:03:23

Market analysis notes that since October 2022, the S&P 500 index has risen 117% cumulatively, driving the total market capitalization of U.S. stocks to increase by nearly $40 trillion, with the rally mainly fueled by AI-related stocks. Meanwhile, the S&P 500 Equal Weight Index has underperformed its market-cap weighted counterpart by 52 percentage points, hitting the widest gap in history—underscoring this bull market’s reliance on a small number of large tech stocks. Nvidia’s share price has surged more than 1900% cumulatively over the same period, while U.S. Treasury yields have recently risen to 5.34%, further stoking market concerns about valuation pressures. Investors are closely monitoring whether corporate earnings growth can sustain this bull market.

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