Shake Shack completed its IPO on Friday, listing on the NYSE under the symbol SHAK. The burger joint raised $105 million, pricing shares well above its upwardly revised price range at $21. Shares of the company rocketed on the secondary market, closing up over 118% at $45.90, giving the company a $1.6 billion market cap. Backed by Alliance Consumer Growth, Shake Shack is a modern day burger stand, offering a classic American menu that includes burgers, hot dogs, crinkle-cut fries and shakes. For the 39 weeks ended September 24, it generated roughly $84 million in total revenue and over $3.5 million in bottom-line net income.