People dressed in food-themed costumes give away donuts to people headed to the floor of the New York Stock Exchange to celebrate the IPO of GrubHub, 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)