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.

While their respective share price appreciation indicates everything is going great for Nvidia, Palantir, and AMD, all three companies have, collectively, offered up a nearly $13 billion warning to Wall Street. The real question is: Are you, or any other investors, heeding this warning?