Intruder Systems Ltd

Intruder is a cybersecurity company headquartered in London, United Kingdom, specializing in vulnerability management and attack surface management. Founded in 2015 by Chris Wallis, its mission is to help organizations identify and prioritize critical security vulnerabilities, enabling them to focus on the most significant threats while reducing information overload.

The company offers a suite of security solutions including External, Internal, Cloud, Web App, and API Vulnerability Scanners, alongside Automated Penetration Testing and Attack Surface Management. Intruder's services also support compliance with standards such as SOC 2, ISO 27001, PCI DSS, and HIPAA, catering to a global customer base of over 3,000 organizations.

Under the leadership of CEO Chris Wallis, Intruder has achieved notable recognition, including being selected for GCHQ's Cyber Accelerator and being listed on Deloitte's Tech Fast 50 2023 as the fastest-growing cybersecurity company in the UK. In October 2025, it was awarded "External Attack Surface Management Platform of the Year" at the 9th annual CyberSecurity Breakthrough Awards. The company has grown to $13M ARR and 3000+ customers worldwide, notably without external venture capital funding.