CyrusOne owns and/or operates 47 data centers, primarily in the U.S., that encompass more than 7 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 make up about one third of its total revenue. Its largest customer, Microsoft, accounted for 18% of 2018 revenue, and its top 10 customers generated more than 45%. After cloud providers, companies in the financial services and energy industries contributed the biggest proportions of CyrusOne's sales.