Hadrian

Amsterdam-based Hadrian uses autonomous AI agents to continuously map, test and prioritize an organization's external attack surface - the internet-facing assets attackers probe first.

Rather than periodic scans, it runs offensive-security workflows continuously, surfacing the exposures that actually matter so security teams can focus their effort. It reached unicorn valuation in early 2026 after rapid growth.

The product sits in the increasingly important category of AI-driven, continuous security testing.