Stocks fell last week as investors reacted to mixed economic data and concerns over signs of broadening AI disruption of business models. The Standard & Poor’s 500 Index fell 1.39 percent, while the Nasdaq Composite Index declined 2.10 percent. The Dow Jones Industrial Average slid 1.23 percent.

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Stocks climbed in January as the tailwinds of solid economic data offset the headwinds of geopolitical tensions that rattled investors during the month. The Standard & Poor’s 500 Index advanced 1.37 percent, while the Nasdaq Composite rose 0.95 percent. The Dow Jones Industrial Average gained 1.73 percent.

Stocks were mixed last week, with broad gains on Monday and Friday bookending midweek selling pressure as investors digested earnings results from more than 100 S&P 500 companies. The Standard & Poor’s 500 Index ended the week roughly where it started, slipping 0.10 percent, while the Nasdaq Composite Index declined 1.84 percent. The Dow Jones Industrial Average rose 2.50 percent.