Kevin Mandia's Armadin raises $255.5M Series B at $2.5B for agentic offensive security

Armadin, the agentic offensive-security company founded by Mandiant's Kevin Mandia, raised a $255.5 million Series B co-led by Andreessen Horowitz and Accel at a $2.5 billion valuation, bringing total funding to about $445 million. Autonomous red-teaming is becoming a category, and the buyers are Fortune 500 and government. For builders the lesson is the wedge: a founder with distribution plus agents doing a job that used to need a consulting bench.