Net Worth: $23.9 billionSteve Ballmer, Microsoft's former CEO, owns the Los Angeles Clippers. He purchased the Clippers in August 2014 for $2 billion, following racist comments made by Donald Sterling, the team's former owner. It was the highest price ever paid for an NBA team, Forbes said.Ballmer has made most of his fortune from Microsoft. He was Microsoft's chief executive from 2000 to 2014, succeeding Bill Gates. According to Forbes, Ballmer is the software giant's largest individual shareholder and today owns more of its stock than Gates.Last October, Ballmer made an investment in social media site Twitter, acquiring a 4% stake whieh he announced, of course, on Twitter.