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

Even UnitedHealth will struggle to overcome parasitic medical costs that Warren Buffett once called a tapeworm eating away at U.S. economic competitiveness. The $300 billion healthcare conglomerate reinstalled Chairman Stephen Hemsley as CEO and yanked its financial guidance.

Former CEO and current chairman Stephen Hemsley is stepping back into the top job following the abrupt resignation of Andrew Witty, UnitedHealth said.

UnitedHealth Group Chairman Stephen Hemsley is returning to helm the health care conglomerate once again. He will replace Andrew Witty effective immediately.

Robyn Denholm has earned five times as much as UnitedHealth Group's Stephen Hemsley, the next non-executive chair most prone to liquidating stock.

UnitedHealth CEO Andrew Witty is stepping down for personal reasons and the nation’s largest health insurer suspended its full-year financial outlook due to higher-than-expected medical

Shares of UnitedHealth Group, Inc. (UNH) fell over 17% on Tuesday after the health insurance giant said CEO Andrew Witty would step down for personal reasons, with chairman and former chief executive Stephen Hemsley taking his place.

UnitedHealth said Tuesday that Stephen J. Hemsley would take over as chief executive, effective immediately, as it suspended its 2025 outlook. Shares dropped 11% to $337.77 in premarket trading, taking shares of other big health insurers down with it.