After success with his early internet start-ups, Elon Musk became what everyone in the late 1990s wanted to be: a dotcom millionaire.

In 1999, Musk sold his first company, Zip2, to Compaq for roughly $300 million. After that, he went on to start X.com, which eventually became PayPal. In 2002, eBay purchased PayPal for $1.5 billion.