[Analysis: AI Leading Stocks Drive S&P 500 Index Up 117% in Bull Market, Market Concentration Risks Intensify] BlockBeats News, October 9 – Market analysis indicates that since October 2022, the S&P 500 Index has risen by a cumulative 117%, driving the total market capitalization of U.S. stocks up by nearly $40 trillion. The rally has been primarily fueled by AI-related stocks. Meanwhile, the S&P 500 Equal Weight Index has underperformed the market-cap-weighted index by 52 percentage points, marking the largest gap in history and highlighting the current bull market's reliance on a few large-cap tech stocks. NVIDIA's stock price has surged over 1900% during the same period, while U.S. Treasury yields have recently climbed to 5.34%, further raising concerns about valuation pressures. Investors are closely watching whether corporate earnings growth can continue to sustain this bull market. [Original Link]