Kevin Mandia’s AI security startup Armadin raises $255.5M at $2.5B valuation
Armadin’s latest round comes just six months after its $190M Series A, bringing total funding above $445M at a valuation exceeding $2.5B. Kevin Mandia’s startup uses always-on agentic swarms to chain vulnerabilities and simulate attacks continuously.
Armadin, the cybersecurity startup founded by Kevin Mandia, announced on October 1, 2026 that it has raised $255.5 million in a Series B round at a valuation of more than $2.5 billion.
The round 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 funding arrives just six months after Armadin closed a $190 million Series A in March, bringing its total raised to more than $445 million.
Mandia is best known for founding Mandiant, the cybersecurity firm he sold to Google for $5.4 billion in 2022. At Armadin, he is applying a different approach to enterprise security: rather than conducting traditional penetration tests — where hired testers attempt to breach systems and report their findings — the company deploys always-on agentic swarms that chain together vulnerabilities to simulate real attacks continuously.
The goal is to help organizations identify and close security gaps before attackers, including those using their own AI-driven tools, can exploit them. Armadin positions this model as a response to the growing use of agentic AI technology by potential adversaries.
The scale of the Series B and the speed at which it followed the Series A suggest strong investor appetite for AI-native approaches to enterprise security, though whether Armadin’s model will prove more effective than traditional testing methods remains to be seen.