Eduardo Saverin, 30 - worth around $2 billion
Saverin, pictured, co-founded Facebook. He said in May that his next investment, mobile payment company Jumio Inc., is growing faster than Facebook did at the start.
Robert Pera, 34 - worth around $1.5 billion
After working for Apple, Pera created Ubiquiti Networks, which went public in October 2011. It is a communications technology company.