Chris Wanstrath and PJ Hyett Cofounders, Github

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CEO Chris Wanstrath is a self-taught coder who dropped out of college to pursue a career in software development. An active profile on GitHub — his software-development tool that allows users to collaborate — has become a popular destination for Valley programmers to work and get hired.

In mid-June, Bloomberg Business reported that GitHub was raising a $200 million round at a valuation of about $2 billion. GitHub has not put out a statement, but rumors suggest that the round is being led by Andreessen Horowitz, the same firm that led GitHub's first funding round back in 2012 when it raised $100 million.