UnitedHealth Group's stock has collapsed nearly 50% in 2025 after a leadership shake-up, surging medical costs, and a DOJ criminal probe into Medicare fraud.

Shares of UnitedHealth Group slumped 6% in premarket trading Thursday on a report that the U.S. Department of Justice is investigating the embattled health insurance provider for possible criminal Medicare fraud.

Stephen Hemsley ran UnitedHealth Group for more than a decade. It's a different company after four years with Andrew Witty in charge.

"Leading the people of UnitedHealth Group has been a tremendous honor as they work every day to improve the health system and they will continue to inspire me," Witty said in a st

Andrew Witty has resigned as chief executive of US health conglomerate UnitedHealth Group, as the company pulled its financial forecasts for 2025, adding to a sense of crisis after a turbulent period.

Shares of UnitedHealth Group (NYSE:UNH) came under heavy selling pressure after the healthcare giant unexpectedly scrapped its 2025 earnings forecast and announced a major leadership shakeup — developments that triggered swift downgrades from Bank of America and Raymond James.

UnitedHealth Group CEO Stephen Hemsley, who replaced Andrew Witty, said he has the right strategy in place “for the era ahead.”