Horizon3.ai Raises $250M Series E for Autonomous Penetration Testing
Tech Startups·low signal
Horizon3.ai closed a $250 million Series E on August 3, 2026 to expand autonomous penetration-testing tooling, per a venture funding roundup covering that day. The round sits alongside Freehand's $75M for AI supply-chain management and Ellis AI's $10M for private-credit workflow automation. Offensive security is one of the clearest cases where agent autonomy maps to an existing paid workflow — though this is sourced from a single funding aggregator and the round has not been independently corroborated here.