Armadin has raised $255.5 million in Series B funding at a valuation of more than $2.5 billion, just seven months after the AI-native cybersecurity company emerged from stealth. The round was co-led by Andreessen Horowitz (a16z) and Accel, with participation from new investors Bain Capital Ventures and Redpoint. Existing investors 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins and Menlo Ventures also participated. The new financing brings Armadin’s total funding to $445 million.
Led by Mandiant founder Kevin Mandia, Armadin is developing an autonomous security platform intended to help enterprises and government agencies identify and eliminate exploitable attack paths before adversaries can use them.
The company said AI is increasingly compressing the time between the discovery of a vulnerability and development of a working exploit, creating challenges for traditional approaches such as periodic penetration testing. Armadin is designed to continuously approach an organization’s environment from an attacker’s perspective.
Its technology deploys an autonomous swarm of specialized AI agents that reason across an organization’s attack surface like a skilled adversary. Rather than evaluating individual security findings independently, the agents attempt to connect weaknesses together into validated attack paths.
Those attack chains can extend from unauthenticated remote-code execution at an organization’s perimeter through lateral movement and ultimately to cloud compromise. Security teams can then see the specific path an attacker could use, understand the potential blast radius and address the underlying weaknesses.
Only seven months after launching from stealth, Armadin said it is already running agentic attack campaigns in production for Fortune 500 enterprises and government customers.
The company’s platform delivers what Armadin calls AI Hyperattacks, which are designed to identify previously unknown or unexpected combinations of vulnerabilities and security weaknesses that could create exploitable paths.
Armadin plans to use the Series B proceeds to scale its agentic security platform and expand its research, training and go-to-market operations.
The company is positioning its autonomous offensive-security approach as a response to a cybersecurity environment in which attackers increasingly have access to AI systems capable of accelerating vulnerability discovery, exploitation and attack planning.
Armadin’s team combines cybersecurity researchers, engineers and offensive security specialists. Mandia previously founded Mandiant, the cybersecurity company acquired by Google in 2022.
KEY QUOTES:
“Offense is uniquely advantaged right now. AI lets an attacker find and chain weaknesses faster than any human team can respond. The only way to build a defense that keeps pace is to train it against the best offense available, every day. That is what we built. With a16z and Accel co-leading and the support of every investor in this round, we are going to put that offense to work for the enterprises and government agencies defending the world’s most critical systems.”
Kevin Mandia, CEO of Armadin
“Against agentic adversaries, the best defense is a great offense powered by AI. That was our conviction when we led Armadin’s Series A, and it’s even more pressing today. In less than a year, Armadin has set the standard for AI-powered offensive security and remediation across enterprises and governments, and we’re excited to keep partnering with them.”
Ping Li, Partner at Accel
“Every major platform shift creates a new generation of security leaders, and AI is the biggest shift we’ve seen. Kevin has been on the front lines of the most consequential breaches in history, and he has built a team that pairs elite red teamers with world-class AI engineers. We invested because we believe Armadin will become the defining security company of the AI era.”
David George, General Partner at Andreessen Horowitz
