GrubHub CEO Matt Maloney (R) celebrates after ringing the bell to mark the company's IPO on the floor of the New York Stock Exchange in New York April 4, 2014. Shares of GrubHub Inc, the biggest U.S. online food-delivery service, rose as much as 57 percent in its market debut as investors scrambled for a piece of the fast-growing consumer internet company. REUTERS/Lucas Jackson (UNITED STATES - Tags: BUSINESS FOOD)