Former Microsoft CEO Steve Ballmer is now just as rich as his former boss Bill Gates. Here's how he spends his billions.

Ballmer is one of the world's wealthiest sports team owners.

He bought the Los Angeles Clippers NBA team in 2014, the same year he stepped down as Microsoft's CEO. He paid $2 billion, a record for the sale of a professional basketball team at the time.

Ballmer says he's footing the bill to build the most expensive arena in the NBA. The Intuit Dome, which is still under construction in Inglewood, California, just outside Los Angeles, is expected to cost $2 billion.

(Ballmer added that his obsession with the arena is "toilets, toilets, toilets." The 17,500-seat arena will have 1,160 toilets and urinals, Bloomberg reported.)

Over the years, Ballmer has snapped up multiple homes in Washington state, where Microsoft is headquartered.

In 2019, he and his wife, Connie Ballmer, with whom he shares three children, paid $9.8 million to buy the home adjacent to their existing home in Hunts Point.

The couple began buying property on Whidbey Island in Washington in 2005.

In 2017, Ballmer launched USAFacts.org, whose website says it "makes government data accessible and understandable."

He told The New York Times that year that he'd spent upward of $10 million on USA Facts in direct funding and grants, and that it could cost up to $5 million a year to sustain.

The Ballmer family office funds organizations with the goal of "improving economic mobility and opportunity for children and families in the United States," according to its website.

Through the couple's philanthropic arm, for example, they've pledged $425 million to the University of Oregon for an institute for children's mental and behavioral health.