The S&P 500 Just Did Something It Has Only Done Once in History, and It Could Signal a Big Move in the Stock Market

The S&P 500 (SNPINDEX: ^GSPC) outperformed the S&P 500 Equal Weight Index by more than 10% during the first half of the year, something that has happened just once before. A handful of artificial intelligence (AI) companies were responsible. The companies in question have

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