San Francisco based RiskIQ has a cloud solution that detects security threats and lets clients understand where and how they can be attacked on their corporate network and connected devices. Its customers include Facebook, American Express, and BMW. They were founded in 2009 and raised $83M. Microsoft announced the deal in a post that says they have 3,500 employees working on security at Microsoft and a mission to help protect customers "from the chip to the cloud". Link
