Amazon revenue from cloud infrastructure services in the second quarter of 2014 rose 49 percent against salesforce 38 percent, Microsoft 164 percent, IBM 86 percent and Google 47 percent, said Synergy Research Group.
The report said that Microsoft and IBM are leading the growth in cloud infrastructure services.
Amazon (AWS) is not bigger than its closest four competitors combined.
Due to tougher competition, AWS did not grow cloud revenues on a sequential basis, and consequently saw its at year-on-year growth rate drop to 49 percent.
Meanwhile, Google is not managing to keep pace with its larger rivals.
Cloud infrastructure service revenues (including IaaS, PaaS and private & hybrid cloud) have reached $3.7 billion in Q2.
The total market is growing at over 45 percent.
Microsoft and IBM have gained market share over the last four quarters while the share of AWS and Google is unchanged from a year ago.
Total Amazon AWS revenues are well in excess of $1 billion per quarter, with nearly all of that coming from cloud infrastructure services.
IBM and Microsoft also both claim quarterly cloud revenues of around $1 billion, but in their cases much of the cloud revenue comes from software/SaaS, cloud-related hardware products or associated professional and technical services.