Company: Dropbox

Net worth: $400 Million (est.) 

What began as a simple college project between co-founders Arash Ferdowsi and Drew Houston is nearly billion-dollar business. The youthful CTO dropped out of college and fully committed to the start-up, helping Dropbox secure 45 million users in less than four years. As the company continues to grow in popularity, so does Ferdowsi’s wealth.