Horizon3 AI, founded in 2019, operates in the cybersecurity sector with a focus on autonomous penetration testing and security posture assessment. The company's platform, NodeZero™, continuously assesses an organisation's security posture across internal, external, cloud, and hybrid environments, aiming to identify and remediate exploitable attack vectors before adversaries can exploit them. The platform was named the third fastest-growing company in North America on the 2025 Deloitte Fast 500.
The company's team brings together former U.S. Special Operations cyber operators, startup engineers, and cybersecurity practitioners. This combination of backgrounds is oriented toward addressing challenges such as ineffective security tools, false positives, alert fatigue, and the cybersecurity skills shortage. Horizon3 AI's customer base spans sectors including IT operations, security operations, consulting pentesters, managed security service providers (MSSPs), managed service providers (MSPs), education, and government.
Based in North America, Horizon3 AI serves organisations seeking to move beyond traditional vulnerability scanning toward continuous, autonomous testing of their defences. The company's approach centres on enabling security teams to find, fix, and verify exploitable weaknesses in a systematic manner.
