Kevin Mandia’s new ‘agent swarm’ security startup Armadin raises $255.5M at $2.5B valuation

Kevin Mandia's latest cybersecurity venture, Armadin, said Thursday that it raised $255.5 million in a Series B round that values the company at more than $2.5 billion. The financing was led by Andreessen Horowitz and Accel, with participation from Bain Capital Ventures, Redpoint, 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins, and Menlo Ventures.

The new capital follows a $190 million Series A in March, bringing Armadin's total disclosed funding to in excess of $445 million. Mandia previously founded Mandiant, which Google acquired in 2022 for $5.4 billion.

Armadin markets an "always-on" defensive testing product that replaces periodic penetration tests with continuous agentic swarms. According to the company, these automated agents chain together discovered weaknesses to simulate multi-step intrusions, with the goal of finding and closing attack paths before malicious actors or autonomous AI agents can exploit them.

Investors and the company frame the technology as a response to threats emerging from more capable, agentic AI systems. Armadin positions its service as a proactive way for enterprises to surface complex, chained vulnerabilities that single-point tests might miss, though the company has not published independent efficacy metrics in the announcement.