The Dow briefly reached a record high, propelled by UnitedHealth's surge following Berkshire Hathaway's increased stake.

TheStreet. Warren Buffett is arguably the most successful investor of all time. He's amassed an amazingly massive net worth ...

Warren Buffett’s Berkshire Hathaway (BRK.B) sold shares in Apple (AAPL) last quarter, [while adding UnitedHealth](https: ...