XBOW builds an autonomous offensive security platform that uses AI agents to perform penetration testing without human input. The system discovers, chains and exploits vulnerabilities across a customer's attack surface and proves each finding with a working exploit, completing a comprehensive pentest in hours rather than weeks. Founded in January 2024 by Oege de Moor, who previously created GitHub Copilot and GitHub Advanced Security at Microsoft, the company lists Seattle as its headquarters while operating as a distributed team of more than 250 people. In March 2026 it raised a $120M Series C led by DFJ Growth and Northzone at a valuation above $1 billion, later extended to $155M with participation from NVIDIA, Samsung and SentinelOne.