Horizon3.ai

Horizon3.ai is a cybersecurity company that develops the NodeZero Platform, an autonomous pentesting solution. NodeZero supports internal, external, Kubernetes, cloud, and Active Directory pentesting, as well as vulnerability management, security control validation, and threat detection capabilities. The company serves industries including financial services, healthcare, the US public sector, manufacturing, and education, and operates through MSSP and MSP partner channels. In 2026, Horizon3.ai opened a headquarters in Amsterdam, reinforcing its long-term commitment to Europe.