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

The investment comes as UnitedHealth faces soaring medical costs, federal investigations, the fallout of the killing of a top executive and a cyberattack last year.

Warren Buffett's Berkshire Hathaway has acquired 5 million shares in UnitedHealth Group , a regulatory filing showed on Thursday, sending the health insurer's stock up 7% in extended trading.

Buffett owned UnitedHealth shares before selling his stake in 2010, though his Berkshire Hathaway recently acquired shares.

UnitedHealth Group (UNH) shares soared 12% on August 15, 2025, after Warren Buffetts Berkshire Hathaway revealed a $1.6 billion stake of over 5 million shares. The surge marks the stocks biggest jump in five years,

Warren Buffett's Berkshire Hathaway built a $1.6 billion stake in UnitedHealth last quarter, marking one of its last wagers with the investor as CEO.

However, Apple is not the only big position that Buffett has been reducing. He also continues to sell down his stake in Bank of America . Buffett sold about 4% of his remaining Ba