XBOW
Autonomous offensive security platform that finds and exploits software vulnerabilities faster than human hackers.
- Founded
- 2024
- Headquarters
- Seattle, WA
- Latest Round
- Series C
- Est. Valuation
- ~$1,200M
Investment Thesis
XBOW has built an autonomous AI platform that continuously tests applications for vulnerabilities, identifying and exploiting weaknesses with the speed and depth of a top-tier red team. The company's AI system reached the number one spot on HackerOne's global leaderboard, marking the first time a machine outperformed all human hackers on the platform.
Founded in January 2024 by Oege de Moor and Mike Horton, XBOW raised a $20M seed led by Sequoia Capital, followed by a $75M Series B led by Altimeter in June 2025, and a $120M Series C led by DFJ Growth and Northzone in March 2026 at a valuation exceeding $1B. Total funding stands at approximately $237M.
Penetration testing is manual, expensive ($50K-$500K per engagement), and infrequent, leaving organizations with point-in-time snapshots of their security posture while attackers probe continuously.
XBOW builds AI agents that autonomously conduct offensive security testing — discovering vulnerabilities, chaining exploits, and generating proof-of-concept attacks with the creativity of an elite human pentester but running 24/7 at machine speed.
XBOW has demonstrated the ability to autonomously discover and exploit real-world vulnerabilities including zero-days, outperforming human pentesters on standard benchmarks and catching issues that manual testing misses.
Attack surfaces are expanding faster than security teams can audit them, AI dramatically lowers the cost of continuous offensive testing, and regulators are mandating more frequent security assessments across industries.