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CHICAGO, IL - JANUARY 28: In this photo illustration a cheeseburger and drink is served up at a Shake Shack restaurant on January 28, 2015 in Chicago, Illinois. The burger chain, with currently has 63 locations, is expected to go public this week with an IPO priced between $17 to $19 a share. The company will trade on the New York Stock Exchange under the ticker symbol SHAK. (Photo Illustration by Scott Olson/Getty Images)

CHICAGO, IL - JANUARY 28:  In this photo illustration a cheeseburger and drink is served up at a Shake Shack restaurant on January 28, 2015 in Chicago, Illinois. The burger chain, with currently has 63 locations, is expected to go public this week with an IPO priced between $17 to $19 a share. The company will trade on the New York Stock Exchange under the ticker symbol SHAK.  (Photo Illustration by Scott Olson/Getty Images)