Entrepreneurs that Got Filthy Rich in 2011

2 of 14

Andrew Mason, Groupon

Andrew Mason cashed in on Groupon’s IPO, which raised $700 million, becoming the largest IPO by a U.S. Internet company since Google raised $1.7 billion in 2004. With 45.9 million shares in the company, Mason’s net worth exceeds a billion dollars. Not bad for a 31 year old.