5. Salesforce

Sales of Salesforce's platform offerings grew at 40 percent year over year in the fourth quarter, maintaining the CRM giant's overall position in the cloud infrastructure services market, according to Synergy.

Salesforce, San Francisco, maintains fifth place with a 4 percent share.

Keep in mind that Synergy is only tabulating cloud infrastructure and platform services, so Salesforce isn't credited with its league-leading SaaS business in this study.