Participated · Series E · Aug 2026

Horizon3.ai develops AI specifically designed to perform autonomous, authorized penetration testing across live infrastructure via its NodeZero platform. The platform is built to test live systems without shutting down operations and to scan entire infrastructures continuously rather than sampling a small percentage. The company reports having run 310,000 production security tests with zero disruptions and serves roughly 7,200–7,300 customers ranging from managed service providers to Fortune 10 enterprises. Horizon3 approached $100 million in annual recurring revenue last year and achieved 120% year-over-year growth. Its founders, who met while serving at Joint Special Operations Command, have reinvested heavily in product development—about $100 million in R&D to date. The company is expanding internationally with new offices and a growing partner network while positioning itself to address accelerating AI-driven attack threats.