Horizon3.ai secures $100 million Series D to automate security for enterprise and federal networks

Horizon3.ai today revealed a $100 million Series D funding round led by NEA, joined by SignalFire, Craft Ventures, and 9Yards Capital. NEA partner Lila Tretikov, formerly Microsoft’s deputy CTO and now NEA’s head of AI strategy, will join Horizon3.ai’s board.

Since its founding in 2019 by former US Special Ops cyber operators and enterprise security veterans, Horizon3.ai has expanded its reach to more than 3,000 organizations using its NodeZero autonomous pentesting platform. According to CEO Snehal Antani, the startup is sustaining annual recurring revenue growth north of 100 % and has met the Rule of 40, signaling efficient scaling.

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NodeZero uses reinforcement learning and graph-based reasoning to launch real attacks on live systems, then guides teams to fix critical vulnerabilities. Antani highlights the risk of automated adversaries: traditional teams struggle to stay ahead of AI-powered attacks. NodeZero counters that by simulating human-level hacks at machine speed, and learning from each breach. In one test, it breached a bank in four minutes with zero human input. In another, it accessed sensitive US aircraft carrier design data through a third-party link.

Horizon3.ai plans to use the $100 million to scale partnerships globally, beef up product features around web app testing, vulnerability management, and defensive tuning, and to push further into federal markets. The company recently won FedRAMP High authorization and joined the NSA’s Continuous Autonomous Pentesting (CAPT) initiative. It now has its sights set on a secret and top-secret workload.

NEA’s Aaron Jacobson praised Horizon3.ai for carving out the autonomous security space, noting that both red and blue teams rely on NodeZero. Tretikov, the new board member, added that the startup is meeting real demand for tools that defend at machine pace.

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