Microsoft CEO Satya Nadella. Getty Images/Stephen Brashear Tech research firm Gartner has ranked the top tech vendors worldwide based on their revenues for IT and components.

The list is designed to help business leaders understand how much various tech companies sell as relatively new tech firms like Google and Facebook go head-to-head with more established companies like Microsoft, HP, and IBM.

The list, which includes 100 companies in total, includes big names such as Apple and Amazon, as well as lesser-known tech companies who sell their hardware and software directly to businesses.

Gartner said business leaders can use the list to understand how and where companies are spending their IT budgets.

John-David Lovelock, a vice president at Gartner, said in a statement that "the needs of IT buyers are shifting" and "the impact of digital business is giving rise to new categories."

Here are the 26 biggest tech companies by revenue: