NEW YORK, NY - JANUARY 30: People line up for free Shake Shack hamburgers outside of the New York Stock Exchange (NYSE) during the burger company's IPO on January 30, 2015 in New York City. Hamburger chain Shake Shack rose more than 130 percent in its trading debut on the NYSE Friday. Shares for the New York based burger chain opened at $47 and quickly climbed above $52 before dipping back to $48.77 for a 132 percent advance. (Photo by Spencer Platt/Getty Images)
