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.

Here are some of the stocks making notable moves in Friday's premarket action: UnitedHealth shares are jumping more than 10% after Warren Buffett's Berkshire Hathaway said in a filing it had [built a

Beaten-down UNH is set to challenge its 50-day moving average after a major vote of confidence from the Oracle of Omaha.