UnitedHealth CEO steps down as insurer suspends its financial outlook, 5 months after UnitedHealthcare boss was killed in Manhattan ambush

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 costs.

UnitedHealth cut its 2025 forecast last month following it’s first quarterly earnings miss in more than a decade. Shares of UnitedHealth, which have plummeted 38% since the deadly Dec. 4 ambush of company executive Brian Thompson in midtown Manhattan, fell another 8% before the opening bell Tuesday.