Investors were digesting a busy week of tariff hikes and inflation updates, as fresh retail data and earnings reports rolled in.

The Dow Jones underperformed the other major indexes on the stock market today. GameStop climbed while Samsara broke out of a base.

Two of the best known U.S. stock indexes—the S&P 500 and the Dow Jones Industrial Average—move in opposite directions more often than ever before. Since the S&P 500 was introduced in 1957, one index ...