U.S. stock indexes ended mixed after Nvidia, Palantir and other superstar stocks pared most of their steep losses from the morning. The S&P 500 dipped 0.2% Wednesday after trimming a

NEW YORK — Wall Street faded on Tuesday following drops for Nvidia and other stars that have been riding the mania surrounding artificial-intelligence technology. The S&P 500 fell 0.6% for a third straight loss The heaviest weight on the market was Nvidia,

Stocks often rise the week of the Fed’s big Jackson Hole gathering. Don’t count on it this year.

Software maker Palantir (NASDAQ: PLTR) plunged more than 9%, making it the S&P 500's weakest performer. The Dow Jones Industrial Average (DJINDICES: ^DJI) bucked the trend, edging up 10.45 points, or 0.