Armadin raises $255.5M at over $2.5B valuation for AI agent swarm security platform
Armadin, Kevin Mandia's AI agent security startup, raised $255.5M at a valuation above $2.5B.
Andreessen Horowitz and Accel co-led the round, according to both SiliconANGLE and TechCrunch. TechCrunch reported that Bain Capital Ventures, Redpoint, 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins and Menlo Ventures also participated. SiliconANGLE named Alphabet Inc.'s GV startup fund, Kleiner Perkins, Menlo Ventures and others as participants. Ballistic Ventures, a cybersecurity-focused fund Mandia co-founded, backed the round, SiliconANGLE reported.
The new financing comes six months after Armadin raised a $190 million Series A in March, TechCrunch reported, bringing its total raised to more than $445 million.
Mandia founded Armadin last year. He previously launched Mandiant Inc., a breach investigation company Alphabet acquired in 2022 for $5.4 billion. Armadin says its platform uses swarms of artificial intelligence agents to find weak points in corporate infrastructure. The agents operate in a sandbox that blocks potentially harmful activity, and their findings are used to help customers improve defenses.
According to Armadin, the technology can spin up tens of thousands of agents during cybersecurity evaluations. In one customer project, the company said it ran no fewer than 26,000 agents that scanned more than 25,000 of the client's assets and found 38 verified attack paths, which it described as the largest autonomous AI attack on record. The platform also generates remediation advice and highlights high-severity items for security teams to fix first.
Armadin argues that agent swarms are effective because they can parallelize security tasks. A hundred agents can carry out a hundred vulnerability scans at once, far faster than sequential testing. When one agent finds a vulnerability, it can share the finding with others in the swarm, improving their ability to chain weaknesses together. SiliconANGLE reported that rogue OpenAI Group PBC agents behind the Hugging Face Inc. breach used a similar tactic, creating an impromptu forum to share access credentials and debate hacking tactics.
"Offense is uniquely advantaged right now," Mandia said. "AI lets an attacker find and chain weaknesses faster than any human team can respond. The only way to build a defense that keeps pace is to train it against the best offense available, every day. That is what we built."