Dr. Oz's assets range from a tree trimming company to a cattle farm to UnitedHealth stock, and they're worth up to $334 ...

The selloff came as more than $2.7 trillion worth of options expired, an event which typically spurs heightened volatility.

UnitedHealth Group stock tumbled following a report that said the Justice Department had launched a civil fraud investigation into the company’s Medicare billing practices.The DOJ probe aims to ...