While Starbucks got a lot of positive press following the hiring of its new CEO, Brian Niccol, Chipotle Mexican Grill (NYSE: CMG) just lost the individual who had helped guide it successfully over the past six years.

Let's look at the potential effect on the company and whether the stock is still a buy.

Brian Niccol jumping ship to go from CEO of Chipotle to taking the reins at Starbucks shocked the investment world, sending shares of Starbucks soaring while shares of Chipotle sank. Niccol helped lead a turnaround at Chipotle following a spate of foodborne illnesses at the restaurant. He was also instrumental in pushing out new technology to help increase worker efficiency, improve Chipotle's supply chain, and help with staffing and restaurant traffic. He led the charge with mobile ordering and Chipotle's loyalty program to keep more casual diners engaged and coming back.

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Source Fool.com