CyrusOne owns or operates 53 data centers, primarily in the U.S., that encompass more than 8 million net rentable square feet. It has a few properties in Europe and Asia. CyrusOne has both multitenant and single-tenant data centers, and it is primarily a wholesale provider, offering large spaces on longer-term leases. The firm has about 1,000 total customers, and cloud service providers and other information technology firms make up about half its total revenue. Its largest customer, Microsoft, accounted for over 20% of 2020 revenue, and its top 10 customers generated about 50%. After cloud providers, companies in the financial services and energy industries contributed the biggest proportions of CyrusOne's sales.
