GrubHub CEO Matt Maloney looks up at a screen during 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)