Former UnitedHealth Group chief executive officer Stephen Hemsley to replace Andrew Witty. Here's what we know.

The Wall Street Journal on Wednesday cited people familiar with the matter as saying that the probe has been ongoing since last year.

Stephen Hemsley hasn’ t been CEO at UnitedHealth Group in nearly a decade yet he’ s never really left. Since that day, the company’ s stock has fallen from $610 a share to $308 on Tuesday, an unprecedented decline for the company that culminated in this week’ s CEO transition.

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.