MCLEAN, Va.--(BUSINESS WIRE)--GTT Communications, Inc. (“GTT”) (NYSE: GTT), the leading global cloud networking provider to multinational clients, will present at William Blair & Company’s 35th Annual Growth Stock Conference in Chicago, IL on June 9-11, 2015. Rick Calder, GTT President and CEO, is presenting on Tuesday, June 9th at 9:10am CT and meeting with investors that day. A webcast of the session and a copy of the company’s latest investor presentation can be found on the company’s we


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