Check out the companies making headlines after the bell Monday:
Chipotle remained lower after the chain restaurant operator warned that sales could fall short of expectations due to an E. coli outbreak. New fears surfaced in Boston on Monday, where more than a dozen Boston College students complained of gastrointestinal problems after eating at the restaurant.
Outerwall's plunged after the company said its Redbox segment had "not met performance expectations." The company also slashed its full year guidance for fiscal year 2015 and announced that Redbox chief Mark Horak is leaving the company.
Staples moved higher when it said it would contest a decision by the FTC to challenge its proposed merger with Office Depot. Staples has proposed to buy rival Office Depot for $6.3 billion. Both companies said they will show the decision is based on "a flawed analysis and misunderstanding" of the competitive landscape the companies deal with." Office Depot was slightly lower.
Shares of Nike got a boost after the company said it had signed NBA star LeBron James to a lifetime deal. The sneaker giant did not disclose the terms of the agreement.
Cheniere Energy fell after The Wall Street Journal reported that activist investor Carl Icahn raised his stake in the company to 13.8 percent from 12.7 percent.
A report that Newell Rubbermaid and Jarden are in talks to merge sent both stocks higher. Newell Rubbermaid, known for its Sharpie markers and Parker pens, was reported by The Wall Street Journal to be in talks with the consumer products company. Neither company was immediately available for comment.
— CNBC's Jacob Pramuk, Reuters and the AP contributed to this report.