UnitedHealth (UNH) stock jumped 8.2% in Thursday after-hours trading after Warren Buffett's Berkshire Hathaway (NYSE:BRK.B) (NYSE:BRK.A) disclosed that it acquired a new stake in the health insurer ...

A look at the updated Berkshire Hathaway portfolio after the second quarter, including a new stake in UnitedHealth.

Arista Networks surges on record earnings and raised guidance, while Lucky Strike struggles after a sharp earnings miss.