Chipotle Mexican Grill will bring back $6 margaritas for a limited time through a five-city 'Summon the Spirits Tour' leading up to Halloween. Shares rose 4.3% to $32.67, making it one of the best S&P 500 performers. The stock is down 11% year-to-date. The move follows similar nostalgia-driven menu returns by Taco Bell and McDonald's.

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