Since its opening, Shake Shack has grown to be the largest part of the USHG's portfolio. Its average store performance of US$4 million is more than twice that of McDonald's average store performance within the United States.[2] Its popularity is such that in the summer at its original location, the wait in line for service can stretch to over an hour, especially on weekends when the weather is pleasant. A webcam on the restaurant's web page shows the current line in real time.[2]
In August 2014 reports surfaced that the company was preparing to go public with an IPO and was discussing an underwriting with a number of investment banks.[3]
On January 29, 2015 Shake Shack priced its IPO at $21 per share. On the morning of January 30, 2015 it began trading on the NYSE at $47 per share under the ticker symbol SHAK.