S&P 500 bull market turns 4, up 117% to near records

The S&P 500 bull market turns four on Oct. 12, up 117% from its 3,577 bear-market close to near record highs, per Morningstar and Reuters. Tech and AI megacaps led the advance. For ordinary investors, the math is simple: broad gains exist, but they rest on a narrow set of winners.