Berkshire Hathaway recently initiated a position in UnitedHealth Group stock. Shares of UnitedHealth have plummeted by roughly 40% this year. Despite some turbulence, its business boasts several attributes that Buffett seeks.

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 bought around 5 million shares of UnitedHealth last quarter,

Warren Buffett's Berkshire Hathaway increased its holdings in UnitedHealth Group stock, and also added positions in D.R. Horton, Lamar Advertising, and Nucor.