Shares of UnitedHealth Group are surging before the market open Friday as Warren Buffett's Berkshire Hathaway disclosed that it recently purchased shares of the beleaguered insurer.

Berkshire Hathaway revealed three new investments Thursday in steelmaker Nucor and two of the nation’s biggest homebuilders — Lennar and DR Horton — but none of the investments are big enough to ensu...

The "vote of confidence" from Buffett validates UnitedHealth's long-term value, but " (the) management needs to regain trust and credibility with investors, and get back to its beat-and-raise reputat...