Shares of UnitedHealth Group plunged more than 13% following a report that the Department of Justice is carrying out a criminal investigation into the health-care giant over possible Medicare fraud.

UnitedHealth Group is being investigated for possible Medicare fraud, according to The Wall Street Journal, sending shares of the healthcare company sliding in after-hours trading just one day ...

UnitedHealth Group UNH.N was sued on Wednesday for allegedly concealing how backlash from the killing of a top executive was damaging its business, causing its stock to nosedive after the ...