AI-native cybersecurity company Armadin has raised $255.5 million in Series B funding as it looks to scale its autonomous security platform.
The financing was co-led by Andreessen Horowitz (a16z) and Accel and values the company at more than $2.5 billion.
New investors Bain Capital Ventures and Redpoint participated in the round, alongside existing investors 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins and Menlo Ventures.
The latest financing brings Armadin's total funding to $445 million.
Seven months after emerging from stealth, Armadin said its technology is running agentic attack campaigns in production for Fortune 500 enterprises and government customers.
The company's platform is designed to address the increasing speed at which AI can identify and exploit cybersecurity vulnerabilities.
Armadin argues that traditional periodic penetration testing can struggle to keep pace as frontier AI models compress the period between vulnerability disclosure and the development of a working exploit.
The company also seeks to address limitations associated with security scanners that assess individual findings in isolation.
Armadin's approach deploys an autonomous group of specialised agents designed to reason across an organisation's attack surface in a manner similar to an adversary, linking individually lower-severity weaknesses into validated attack chains.
According to the company, these chains can extend from unauthenticated remote code execution at the perimeter through lateral movement and ultimately to cloud compromise.
The platform is intended to show enterprise and government security teams the attack paths that an adversary could use, together with the potential impact, allowing security teams to address those paths before exploitation.
Kevin Mandia, CEO of Armadin, said:
“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.”
Armadin plans to use the investment to scale its agentic security platform and expand its research, training and go-to-market activities.
Ping Li, Partner at Accel, said:
“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.”
David George, General Partner at Andreessen Horowitz, said:
“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.”
About Armadin
Armadin is an AI-native cybersecurity company developing an offensive security platform intended to identify and eliminate exploitable risks within organisations.
The company's platform uses AI-driven attack simulations to identify attack paths before they can be exploited by adversaries.
Armadin is led by CEO Kevin Mandia and comprises engineers, researchers and cybersecurity specialists focused on autonomous security.
Source: Armadin