The 10 wealthiest tech billionaires in the world

Of the world's 10 richest tech billionaires, four are college dropouts. All are men, all are from two countries (the United States and China), and all currently are or were heads of companies.

These are some seriously wealthy folks - the entry level to this list is $18.2 billion net worth (that includes cash, stock, and various other holdings). Some now spend their time trying to change the world, others spend their time owning sports teams, and some are still running the company that made them rich.

Heck, one of them is launching stuff into space:

This list of the 10 richest tech billionaires in the world comes from a collaboration between Business Insider and wealth analytics firm Wealth-X, which recently created a list of the top 50 richest people on Earth.

Emmie Martin and Tanza Loudenback contributed research to this report.

Let's jump in, starting with number 10: