The heaviest weight on the market was Nvidia, whose chips are powering much of the move into AI. It sank 3.5%.

U.S. stock indexes ended mixed after Nvidia, Palantir and other superstar stocks pared most of their steep losses from the morning.

Nvidia, Palantir and other superstar stocks that surged in the mania surrounding artificial-intelligence technology are dragging Wall Street lower again on Wednesday. The S&P 500 fell 0.9% and was on track for a fourth straight loss after setting an all-time high last week.