Illumio is an American cybersecurity company specializing in breach containment and Zero Trust segmentation. Its platform is designed to prevent the lateral movement of attackers and to contain ransomware and breaches across hybrid and multi-cloud environments. Illumio provides visibility into communication and traffic flows, maps application dependencies, and enforces least-privilege segmentation policies across cloud, endpoint, and data center workloads. The company incorporates AI-powered capabilities to assess risk, identify threats, and isolate compromised systems. Founded in 2013 by Andrew Rubin and P.J. Kirner, Illumio is headquartered in Sunnyvale, California, and maintains offices internationally.