Stock market volatility can be very unsettling for investors, especially when major U.S. market indexes like the Nasdaq Composite (NASDAQINDEX: ^IXIC) plunge by more than 20% (and into bear territory) ...

UnitedHealth Group stock crashed on Thursday, falling more than 22% and putting the stock on track for its largest single-day ...

While many stocks have been affected by the marketwide sell-off, few stocks have had as much bad luck as The Trade Desk ( TTD ...