Allstream
TelecommunicationsOntario, Canada501-1000 Employees
Allstream is a telecommunications company that provides voice, collaboration, and connectivity services to enterprise customers across Canada and the United States, supported by a broad network of experts focused on reliability. As a single provider of these solutions, it emphasizes scalable offerings and a commitment to helping organizations communicate and collaborate more effectively, including through cloud-enabled capabilities. The company is based in Mississauga, Ontario, and traces its history to more than 170 years ago, dating back to the era of Canada’s first transcontinental railroad. Allstream operates as a wholly owned subsidiary of Zayo Group Holdings, placing it within a broader North American business communications landscape. In June 2026, Allstream disclosed issues related to a ransomware incident, reflecting cybersecurity considerations affecting its operations.