Nvidia, Palantir and other superstar AI stocks are dragging Wall Street lower again. The S&P 500 fell 0.5% Wednesday and was on track for a fourth straight loss after setting

Wall Street fell further from its records. The S&P 500 lost 0.6% Tuesday, its third straight loss after setting its all-time high last week.

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