Todd Wagner

With business partner Mark Cuban, Todd Wagner joined the billionaire ranks after selling video portal Broadcast.com to Yahoo in 1999.The $5.7 billion sale didn't just benefit Wagner and Cuban: their 300 employees became millionaires. Wagner safeguarded his shares against the dot-com bubble's epic burst with put options.Since then, Wagner and Cuban have continued to invest together in ventures such as Magnolia Pictures, Landmark Theaters, and AXS TV. He also founded and runs online fundraising platform Charity Network, which has raised over $200 million for charity since it was started in 2014.