5. Mark Zuckerberg
Mark Zuckerberg founded Facebook, the social network that quickly took over the internet in the mid 2000’s. He owns about 15% of the stock, making him worth $111.6 billion. He founded the company in 2004 while attending Harvard, dropping out after the website started to take off. Zuckerberg took Facebook public in 2012, making him an instant-billionaire. In December 2015, he and his wife Priscilla Chan pledged to give away 99% of their stake in the company.
