Jeff Bezos (net worth: $62.9 billion)

Early investor in Google, Airbnb, and Business Insider, Jeff Bezos is the chairman and largest shareholder of Amazon, the world’s biggest online retailer. The Seattle-based company operates retail websites Zappos and Audible, serves as a platform for third-party vendors, and provides cloud computing services. Publicly traded Amazon had revenue of $107 billion in 2015.