Shares of UnitedHealth Group soared over 12% in premarket trading on Friday after Warren Buffett’s Berkshire Hathaway disclosed a new stake in the health insurer.

UnitedHealth Group issued a grim 2025 earnings forecast on Tuesday, falling far short of Wall Street’s expectations as high medical costs continue to pressure its insurance business.

UnitedHealth Group (UNH) revised its annual profit forecast downward on Thursday, citing sustained high demand for healthcare services that is expected to keep medical costs elevated through the rest of the year.

U.S. Attorney General Pamela Bondi has directed federal prosecutors to seek the death penalty for Luigi Mangione, the man accused of shooting and killing Brian Thompson, the CEO of UnitedHealth Group's insurance division, in New York last year.

UnitedHealth Group has reported that a cyberattack on its technology unit impacted the personal data of 190 million individuals, marking one of the largest healthcare data breaches in U.S. history.

Analysts and investors are eagerly awaiting details on UnitedHealth Group's 2025 outlook as the company prepares to report its quarterly results on Thursday.