Illumio is a cybersecurity company that provides software for securing enterprise computing environments. The company was founded in 2013 by Andrew Rubin and PJ Kirner and is headquartered in Sunnyvale, California. Illumio's software uses micro-segmentation to protect against cyber threats by creating security policies that restrict access to sensitive data and applications. The company's software is used by a wide range of clients, including financial institutions, healthcare providers, and government agencies. Illumio has received numerous awards for its innovative approach to cybersecurity, including being named a Gartner Cool Vendor in 2016.