Screen displays trading information outside the Nasdaq Market site in New York City

A screen displays trading information outside the Nasdaq Market site in New York City, US, Oct. 15, 2026.

NEW YORK — US stocks tumbled on Thursday and the Nasdaq posted its steepest daily drop since early June as a batch of high-profile earnings reports ignited fresh fears about the AI spending race.

The S&P 500 ended deep in negative territory. But the tech-laden Nasdaq, dragged down by microchips, suffered a steeper loss, falling 2.6% in the wake of a spate of high-profile AI-related earnings results.

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