Very few cybersecurity startups travel from stealth to a multibillion-dollar valuation in seven months. Palo Alto’s Armadin has just done exactly that.
The offensive-security company, led by Mandiant founder Kevin Mandia, has raised $255.5M in Series B funding at a valuation above $2.5B.
Andreessen Horowitz and Accel co-led the round. Bain Capital Ventures, Redpoint, 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins and Menlo Ventures also joined, lifting Armadin’s total raised to $445M.
The company sells what it calls an autonomous swarm of specialized agents that reason across a customer’s attack surface. Rather than scanning for a list of known problems, the agents chain individually minor weaknesses into validated attack paths, which security teams can then cut before an intruder finds them. Armadin says it runs these agentic attack campaigns inside production environments for Fortune 500 and government customers.
The pitch reflects a wider shift in cybersecurity, where defenders are adopting the same agentic tooling attackers use. The company argues that continuous, automated offense is the only way to keep pace with software that changes daily.
The round stands out in a market where investors, scarred by thin AI wrappers, now favor companies tied to real operational decisions.
