January 9, 2017

Dear Valued Client:

I am pleased to announce that GTT completed the acquisition of Hibernia Networks today, and we are excited to have you as a client. I would like to take this opportunity to introduce you to GTT and tell you more about our company.

GTT Communications, Inc., is a publicly traded company on the New York Stock Exchange (NYSE: GTT) with 23 offices located around the world. We connect multinational organizations around the world through our expansive network reach and comprehensive portfolio of cloud networking services. Our services include optical networking, EtherCloud® wide area networking, Internet services delivered via our Tier 1 Internet backbone, a comprehensive suite of managed services, voice services and video.

GTT prides itself on delivering outstanding client service with simplicity, speed and agility. You will find us easy to work with, extremely responsive to your requests and flexible in meeting your specific business needs.

For more information on GTT, please visit our website, www.gtt.net.

We look forward to working with you and thank you for your business.

Sincerely,

Rick Calder
GTT President and CEO