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

Horizon3, a cybersecurity startup, raised $250 million in funding at a $2 billion valuation to expand its AI-powered platform that automatically tests networks for vulnerabilities without disrupting operations. The company's NodeZero platform uses AI to continuously scan entire infrastructure for security weaknesses, addressing growing enterprise demand as AI-driven attacks accelerate and traditional security testing methods prove too slow and limited. Horizon3 has completed 310,000 production security tests with zero disruptions, positioning itself as an alternative to the traditional model of annual human-conducted security audits that only examine a small portion of a company's systems.