43. Ben Uretsky, Moisey Uretsky, and Mitch Wainer

Cofounder and CEO (B. Uretsky), cofounder and CPO (M. Uretsky), cofounder and CMO (Wainer), DigitalOcean

DigitalOcean, a cloud-computing startup, is out to take on Amazon. This summer, the fast-growing company raised $83 million from Access Industries and Andreessen Horowitz in a series B round of funding, and has raised $173.2 million in total to date.

DigitalOcean directly challenges Amazon Web Services by providing big, powerful virtual services, but aims to one-up the competition by putting developers first and making things as streamlined as possible. DigitalOcean promises a simple, easy-to-use interface, lower prices, and better performance. And it looks like the strategy is working: Though it’s still a relative newcomer, DigitalOcean is the third-largest hosting company in the world — Amazon is No. 1 — and has grown from 10,000 to 140,000 sites in the last year.