Fresh off a 12% surge on the news that Warren Buffett's Berkshire Hathaway, as well as other leading investors, purchased the stock, UnitedHealth stock rose another 3% in premarket trade. Dayforce shares gained 21% on a Bloomberg report that Thomas Bravo was in talks to buy the software company.

Shares of UnitedHealth Group surged nearly 14% on Friday after billionaire Warren Buffett's Berkshire Hathaway bought 5 million shares of the company, providing a shot in the arm for investors who think the health conglomerate will turn around under its new CEO.

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

Berkshire Hathaway recently filed its second-quarter 13F form, revealing its stock holdings at the end of June.

UnitedHealth shares surged Friday after Warren Buffett’s Berkshire Hathaway revealed a stake in the embattled healthcare giant. Monitor these major chart levels.

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.

UnitedHealth Group jumped nearly 4% on Wednesday, marking its fourth straight day of gains, and kept climbing after hours after the board approved a $2.21 per share quarterly dividend. The payment, set for Sept.