3. Google

2016 revenue: $90.1 billion

2015 revenue: $74.9 billion

The only vendor in the top five to gain in IT spend from 2015 to 2016, according to Gartner, Google is also the only one of the top five whose heaviest business focus is on Internet-based products and services. Google enjoyed triple-digit growth from its cloud platform. Revenue grew more than 100 percent year over year in its last fiscal quarter, according to Synergy Research. Enterprise customers are looking to Google Cloud for mission-critical projects and full migrations, including moving data from on-premises data centers to the cloud, Sundar Pichai recently told investors.

Had the list been built last year based on 2015 revenue, Google would have been fifth, behind Microsoft (which was third) and IBM (fourth).