U.S. stock index futures slid on Friday as growing AI unease weighed on technology stocks, with the Nasdaq staring at its steepest monthly drop since March 2025, ‌and investors awaited key inflation data later in the day. Technology stocks saw immense turbulence this month ‌due to AI concerns, even as investors fretted about the payoff from massive planning spending on artificial-intelligence technology. Brewing tariff uncertainty also ​stoked volatility after the U.S. Supreme Court last week voided most of the duties U.S. President Donald Trump imposed last year.