The 25 Biggest IT Vendors

Each year Fortune ranks the 500 largest U.S. corporations according to revenue and the 2013 list is out. While Wal-Mart ($469.2 billion) and several major oil companies dominated the top of the list, IT companies were well represented throughout.

While the rankings themselves are important, it's even more interesting to see which IT companies moved up the roster and which slipped -– either because their sales declined or they just couldn't maintain healthy growth rates.

Here's a look at the 25 largest IT companies in this year's Fortune 500. And, we didn't even have to go as far as halfway through the list to find them.