Boeing stock tumbles, and shares of Tesla decline. Super Micro continues to fall in the wake of a tech-sector selloff. Apple extends losses, while Palantir loses ground.

Key Takeaways U.S. equities sank at midday with investors apparently looking to lock in 2024 profits ahead of tomorrow's last trading day of the year. South Korea called for inspections of Boeing 737-800 planes after one of them crashed over the weekend,

On Sunday, a Boeing 737-800 crash-landed in South Korea. On Monday a second Boeing 737-800 had to abort its flight and return to base over a landing gear problem. Both incidents involved Korea's Jeju Air,