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After-hours buzz: CMG, BUFF, PLNT & more

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Check out the companies making headlines after the bell Tuesday:

Chipotle Mexican Grill shares edged lower in light trading after news broke about one of its Billerica, Massachusetts, restaurants shutting down after employees became ill. The store closed voluntarily, the Massachusetts Department of Health told NBC Boston.

"After learning that four of our employees were not feeling well, our restaurant in Billerica, Mass., was closed for a full sanitization," Chipotle said, in a statement late Tuesday. "We do not know know if the employees are ill with Norovirus and no customers illnesses are connected to this restaurant."

Shares of natural pet food brand Blue Buffalo popped after the bell after reporting better-than-expected earnings in the fourth fiscal quarter. The company reported sales of $265.2 million, an 11.4 percent increase and above the $259.2 million expected by Wall Street, according to the Associated Press.

The company said it would invest in two new manufacturing centers and a research-and-development center in the next three years, according to a company release.

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Maintenance and facilities management company ABM Industries saw shares rise in extended trading after reporting earnings that beat analyst estimates. The New York company posted adjusted earnings of 38 cents per share, above the 26 cents expected by analysts, according to the Associated Press.

Shares of Planet Fitness were lower in light after-hours trading, after analysts put out a new note about competitor Town Sports International Holdings, the company behind gyms like New York Sports Club. Despite being dropped from many coverage lists, analysts at Piper Jaffray maintained a hold rating and $2 price target on Town Sports after it reported record membership in its quarterly earnings Monday.

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Shares of Town Sports rose slightly on the news.

And shares of Valeant Pharmaceuticals inched higher after activist investor Bill Ackman said it was "the most contrarian investment one can have." Ackman gave Bloomberg the statement after The Wall Street Journal reported the embattled drug company would shuffle its board.