#14 Datapipe

Estimated Valuation: $2 billion

Last Year's Rank: #24

Business: Global IT Management

Location: Jersey City, New Jersey

CEO: Robb Allen

Datapipe provides managed hosting services and data center infrastructure for IT services and cloud computing.

The IT Management Company has seen significant domestic and overseas growth in the past 5 years.  Its revenue was $120 million in 2010 and that it generated about $200 million in 2011.

#13 Pinterest

Estimated Valuation: $2 billion

Last Year's Rank: N/A

Business: Pinterest is a social networking site and app for collecting the things you love.

Location: Palo Alto, California

CEO: Ben Silbermann

It is the pinboard-styled social photo sharing website, and it allows users to create and manage theme-based image collections like hobbies, interests and more. It also allows users to browse pin boards for inspirations, ‘like’ photos and‘re-pin’ images to their own collections.

Pinterest recently raised $100 million at a $1.5 billion valuation, and its user base is increasing exponentially, it also redefined the way people shop by discovery than by inte. Pinterest's valuation is estimated to $2 billion as of last round of financing in 2011.