Shares of Chipotle Mexican Grill (NYSE: CMG) are taking it on the chin today. That's because its highly successful leader is leaving the company. But investors may just be panicking, and that's never a winning investment strategy.

Chipotle shares plunged as much as 14% and were still trading more than 10% lower in midday trading after the company announced CEO Brian Niccol was leaving to become the new CEO of Starbucks.

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Source Fool.com