The Pulse
Armadin Raises $255.5 Million at a Valuation Above $2.5 Billion
Armadin says it raised $255.5 million in a Series B co-led by Andreessen Horowitz and Accel, bringing its valuation above $2.5 billion and total funding to $445 million. The company plans to use the investment to expand its autonomous secur
AI.info Team · Written with AI ·
“Offense is uniquely advantaged right now,” said Kevin Mandia, CEO of Armadin.
Kevin Mandia, CEO of Armadin
Armadin announced on October 1, 2026, that it had raised $255.5 million in Series B funding, a round co-led by Andreessen Horowitz and Accel that values the AI-native cybersecurity company at more than $2.5 billion. The company said its total funding now stands at $445 million. The announcement came seven months after Armadin emerged from stealth.
Investors return for Armadin’s Series B
New investors Bain Capital Ventures and Redpoint joined the round. Existing backers 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins and Menlo Ventures also participated, according to the announcement.
Accel partner Ping Li said the firm had led Armadin’s Series A and was continuing its partnership. “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,” Li said. He added that the company had set a standard for AI-powered offensive security and remediation across enterprises and governments in less than a year.
Andreessen Horowitz general partner David George described AI as a major shift for security and cited Mandia’s experience and the company’s combination of red-team specialists and AI engineers. “We invested because we believe Armadin will become the defining security company of the AI era,” George said.
Armadin says its agents test connected attack paths
Armadin describes its product as an autonomous swarm of specialized agents that reasons like an adversary across an organization’s attack surface. The company says the agents can connect individually low-severity weaknesses into validated kill chains, tracing paths from unauthenticated remote code execution at the network perimeter through lateral movement to full cloud compromise.
The company says its system shows enterprise and government security teams attack paths an adversary could use in production, along with the blast radius of each, so teams can sever those paths before exploitation. Armadin contrasts this approach with scanners that score findings in isolation and periodic penetration tests, which it says cannot keep pace as frontier AI models compress the time between vulnerability disclosure and a working exploit. The funding announcement offers no comparative test data on the speed or effectiveness of its system.
Production use is the company’s stated milestone
Armadin says it is already running agentic attack campaigns in production for Fortune 500 enterprises and government customers, seven months after emerging from stealth. The release does not name customers or provide independent performance results or details about how those deployments are evaluated.
Mandia said the company aims to train its defense against offensive techniques every day. “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,” he said. He said the new backing from the round’s investors would support work for enterprises and government agencies defending critical systems.
Armadin said it will use the investment to scale its agentic security platform, research and training, as well as its go-to-market efforts. The announcement did not break out how much funding will go to each area or disclose other terms of the round.