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

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

Walmart was one of the market’s heaviest weights and dropped 4.5% after reporting a profit for the spring that came up short of analysts’ expectations, while Nvidia and other Big Tech stocks held a bit steadier following two days of sharp swings.