Stocks extend losses; TripAdvisor falls 1.5% By: MarketWatch April 07, 2014 at 10:07 AM EDT U.S. stocks slid Monday, adding to Friday’s drop, which was led by previously high-flying biotech and Internet stocks. Read More >> Related Stocks: Alcoa Baidu.com SP ADR Mallinckrodt plc Standard & Poors 500 TripAdvisor