zero-trust-segmentation
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Airgap Networks Inc. (Acquired by Zscaler)
Airgap Networks was a Santa Clara-based cybersecurity company that built an agentless Zero Trust segmentation platform to stop ransomware and lateral threat movement across enterprise IT, IoT, and OT networks. Using a patented DHCP-proxy architecture, it placed every device in a 'network of one' (a /32 segment) without agents, APIs, or infrastructure upgrades, and shipped an industry-first Ransomware Kill Switch. Founded in 2019 by Ritesh Agrawal and Satish Mohan, the company raised $18.6M before being acquired by Zscaler in April 2024 to extend Zscaler's Zero Trust SASE platform with firewall-free, east-west segmentation.
Illumio
Illumio is a Sunnyvale-based cybersecurity company that pioneered Zero Trust Segmentation. Its Breach Containment Platform - Illumio Segmentation plus the AI-powered Illumio Insights - assumes attackers will get in and focuses on stopping them from spreading. By mapping how applications talk to each other across data centers, public clouds, and endpoints, Illumio lets organizations isolate workloads and contain ransomware and breaches before they become disasters.
Andrew Rubin
Andrew Rubin is the CEO and co-founder of Illumio, the company that pioneered Zero Trust Segmentation - the idea that once a breach happens (and it will), you stop it from spreading. A Brooklyn native who built his career through sales, he founded Illumio in 2013 and scaled it to a $2.75B valuation with $225M in Series F funding, backed by Andreessen Horowitz, Accel, General Catalyst, and investors including Marc Benioff and John W. Thompson. Named to Goldman Sachs' '100 Most Intriguing Entrepreneurs' seven times, he earned EY Bay Area Entrepreneur of the Year in 2024 and remains one of cybersecurity's most vocal advocates for rethinking how organizations think about inevitable breaches.