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.

Shares of UnitedHealth Group surged more than 12% in premarket trading today after Warren Buffett's Berkshire Hathaway revealed a new investment in the US health insurer.

UnitedHealth missed Wall Street's earnings target for two straight quarters this year and was forced to pull back its 2025 outlook in May, rare moves for a company that had long been favored for its ...

While the "vote of confidence" from Buffett's investment validates the long-term value of UnitedHealth shares, the "management needs to regain trust and credibility with investors, and get back to its beat and raise reputation of the past," said James Harlow, senior vice president at Novare Capital Management.