Shake Shack is climbing after crushing earnings (SHAK)

Shake Shack posted first-quarter earnings that topped analyst expectations on Thursday.
The stock popped more than 5% in after-hours trading. 
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Shake Shack reported first-quarter earnings that topped Wall Street's expectations on Thursday, sending shares surging in after-hours trading. 
Here are the key figures:Earnings per share: $0.15 versus an estimated $0.08.
Revenue: $99.1 million versus an estimated $96.78 million.Same-Shack sales, one of