U.S. stocks are back to falling sharply on Thursday, led by AI superstars now feeling the painful downside of big expectations. The S&P 500 was down 1.8% in afternoon trading, resuming its slide after a mini-recovery from the prior day helped it claw back some of its sharp drop over recent weeks.

U.S. stocks were resuming their slide Thursday morning, fueled by concern over AI revenue and Trump’s tariffs.

Any kind of uncertainty around the economy will give Wall Street pause. These tariffs have had a particularly jostling effect because no one knows how long Trump will go through w