UnitedHealth Group, one of America’s biggest corporations and a member of the exclusive Dow Jones Industrial Average, is suddenly unraveling.

UnitedHealth Group CEO Andrew Witty is stepping down from his post for personal reasons and the health care giant says it’s suspending its full-year forecast due to higher-than-expected medical costs ...

"UnitedHealth Group is mired in a crisis seemingly without end. Investors are bracing for another big bout of turbulence given reports of the DoJ investigation," said Susannah Streeter, head of money ...