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

Nvidia, Palantir and other superstar AI stocks are under pressure again and dragging Wall Street lower. NEW YORK (AP) — Nvidia, Palantir and other superstar stocks that surged in the mania surrounding artificial-intelligence technology are dragging Wall Street lower again on Wednesday.

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?