Shake Shack (NYSE: SHAK) is an American fast casual restaurant chain based in New York City. It started out as a hot dog cart inside Madison Square Park in 2001, and its popularity steadily grew. In 2004, it moved to a stand within the park, expanding its menu from New York\u2013style hotdogs to one with hamburgers, hotdogs, fries and its namesake milkshakes.\nSince its founding, it has been one of the fastest-growing food chains, eventually becoming a public company filing for an initial public offering of stock in late 2014. The offering priced on January 29, 2015; the initial price of its shares was at $21, immediately rising by 123% to $47 on their first day of trading.Shake Shack Inc. owns and operates more than 249 locations both domestically and internationally, typically located in stand-alone restaurants and shopping malls.