The S&P 500 slipped 0.4% and is on track for a third straight modest loss after setting its all-time high last week. The Dow Jones Industrial Average was up 8 points, or less than 0.1%, as of 11:50 a.m. Eastern time, and the Nasdaq composite was down 1%.

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 Aug. 20 after Nvidia, Palantir and other superstar stocks pared most of their steep morning losses.