Horizon3 hits $2 billion valuation with $250M Series E as AI threats escalate

Horizon3 raised $250M at a $2B valuation to expand its NodeZero autonomous penetration-testing platform, citing strong ARR growth, enterprise demand driven by AI-enabled attacks, and claims of 310,000 production tests without disruption; the funding will support international expansion, partnerships, and continued R&D as the company positions continuous, AI-driven security testing as an alternative to infrequent manual assessments.