Exclusive: Shake Shack picks JPMorgan, Morgan Stanley to lead IPO - sources

NEW YORK (Reuters) - Shake Shack, the fast-food restaurant chain that has developed a cult following for its 'Shackburgers', 'flat-top' hot dogs and eponymous shakes, has selected JPMorgan Chase & Co and Morgan Stanley to lead a proposed initial public offering, according to people familiar with the matter.