MCLEAN, Va.--(BUSINESS WIRE)--GTT Communications, Inc. (“GTT”) (NYSE:GTT), the leading global cloud networking provider to multinational clients, announced today its plans to release results for the first quarter ended March 31, 2015, on Thursday, May 7, 2015. In conjunction with the release, GTT has scheduled a conference call, which will also be broadcast live over the Internet, on Thursday, May 7, 2015 at 10:00 A.M. Eastern Time. What: GTT’s First Quarter 2015 Financial Results Conference Ca