Feeling ill: Chipotle Mexican Grill shares dropped 4 percent, to $500.37 Wednesday after the restaurant chain said one of its stores in Massachusetts was closed after four employees said they were feeling ill. Shares closed the week at $507.85.

Shake quake: Hamburger chain Shake Shack dropped 10 percent, to $37.86 Tuesday after delivering results and an outlook that disappointed investors. Shake Shack shares closed Friday at $ 34.58.

Sales slip: Dick's Sporting Goods fell 3 percent, to $43.25 Tuesday after fourth-quarter results and future guidance fell short of analysts' expectations as a warmer-than-usual winter crimped the retailer's sales. Its stock closed Friday at $46.44.

Urban jumps: Urban Outfitters rose 11 percent to $31.35 Tuesday after the retailer reported strong earnings and improved margins during the holiday season. The company's Free People brand saw sales jump 17 percent over the same period a year ago. The company earned $72.9 million, or 61 cents per share, in its fourth quarter. Shares closed the week at $33.11.

Flying high: Air Transport Services jumped 23 percent, to $14.48 Wednesday after turning in solid results and saying it will operate an air transport network for Amazon. Air Transport shares finished the week at $14.32.

Chow wow: Pet-food company Blue Buffalo Pet Products rose $3.04, or 16 percent, $21.60 after posting earnings and revenue that topped expectations and upping guidance for the year ahead. Blue Buffalo shares closed the week at $23.02.

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