Armadin raises $255.5M for AI vulnerability detection

Cybersecurity startup Armadin Inc. has raised $255.5 million in a Series B round co-led by Andreessen Horowitz and Accel, valuing the company at over $2.5 billion. Founded by Kevin Mandia, who previously launched Mandiant, Armadin deploys swarms of AI agents to find vulnerabilities in enterprise infrastructure. Its platform can spin up tens of thousands of agents simultaneously to map systems, scan assets, and chain vulnerabilities into attack paths. One customer engagement involved 26,000 agents scanning 25,000 assets and uncovering 38 verified attack paths. Funds will support research, AI training, and go-to-market expansion.