Health Who is allstream owned by? Who is allstream owned by? Zayo Group Holdings, Inc. What is Allstream business? Allstream is a business communications provider based in Mississauga, Ontario that provides IP connectivity, managed IP services, unified communications and voice services to its customers in the United States and Canada. Related Posts:How to Deactivate OnStar as Fast as Possible is explained in myBuick Mobile App.The difference between a regular home and a custom one is called the Amish America.Can Grammarly correct passive voice?Which city has lowest car insurance?