Total Cloud market: IaaS, PaaS, SaaS (Source: Jefferies)
Cloud vendor Annualized revenue % of market Year-over-year growth
Amazon Web Services $18.34 billion 26% 42%
Microsoft Azure $21.21 billion 31% 64%
IBM Cloud $6.03 billion 9% 23%
Google Cloud Platform $5.80 billion 8% 64%
Alibaba Cloud $1.79 billion 3% 92%
Salesforce $9.95 billion 14% 23%
Oracle Cloud $6.11 billion 9% 60%
Subtotal $69.22 billion 68% 49%
Total Gartner estimate $101.93 billion 100% 29%
https://www.marketwatch.com/story/amazon-rules-the-public-cloud-but-google-microsoft-alibaba-are-growing-faster-2017-12-20?siteid=yhoof2&yptr=yahoo