#10. Pierre Omidyar Net Worth: $24 billion

Source: eBay Pierre Omidyar launched eBay in 1995. Three years later, the company went public. Three months after it went public, shares hit the $300 mark, making Omidyar a billionaire.

#9. Michael Dell Net Worth: $30 billion  

Source: Dell computers Michael Dell dropped out of college to start a computer repair business. In 1984, he founded Dell Computers. The company went public in 1988. Dell became a billionaire for the first time in 2000. Dell took his company private in 2013.

#8. MacKenzie Scott Net Worth: $53 billion

#7. Larry Ellison Net Worth: $100 billion

Source: Oracle Larry Ellison founded Oracle in 1977. Oracle went public in 1986. He became a billionaire for the first time in 1993. He was 49-years-old.

#6. Steve Ballmer Net Worth: $101 billion

Source: Microsoft Steve Ballmer dropped out of Stanford to join a little startup known as Microsoft. When Microsoft went public in 1986 he had a net worth of $85 million. He became a billionaire in 1995.

#5. Sergey Brin Net Worth: $121 billion

Source: Google Sergey Brin and Larry Page founded Google when they were graduate students in the Ph.D. program in computer science at Stanford in 1998.

#4. Larry Page Net Worth: $125 billion

Source: Google Larry Page and Sergey Brin became billionaires for the first time in 2004 when Google went public.

#3. Mark Zuckerberg Net Worth: $135 billion

Source: Facebook Mark Zuckerberg famously founded Facebook from his Harvard dorm room. By 2008, his substantial stock holdings in his pre-IPO company had catapulted him into the billionaire’s club. He was 22 years old.

#2. Bill Gates Net Worth: $151 billion

Source: Microsoft and other investments. Bill Gates founded Microsoft with Paul Allen in 1975. Microsoft went public in 1986. He became a billionaire for the first time the following year in 1987.

#1. Jeff Bezos Net Worth: $190 billion