Armadin Raises $255.5M at $2.5B Valuation to Test Enterprise Defenses With AI Agent Swarms

Cybersecurity startup Armadin Inc. announced today that it has raised $255.5 million in a Series B funding round at a valuation exceeding $2.5 billion, according to reporting by SiliconANGLE (https://siliconangle.com/2026/10/01/armadin-nabs-255-5m-to-detect-vulnerabilities-with-ai-agent-swarms/).

The financing round was co-led by venture capital firms Andreessen Horowitz and Accel. Alphabet Inc.'s GV startup fund, Kleiner Perkins, Menlo Ventures, and Ballistic Ventures also participated.

Armadin was founded last year by cybersecurity entrepreneur Kevin Mandia, who previously founded breach response firm Mandiant Inc., which Alphabet acquired for $5.4 billion in 2022. Mandia also co-founded Ballistic Ventures, a cybersecurity-focused venture fund that backed this round.

Armadin's platform deploys swarms of artificial intelligence agents within isolated sandboxes that block harmful actions while identifying vulnerabilities across an organization's infrastructure. By running vulnerability scans in parallel, agent swarms can evaluate large enterprise surfaces simultaneously rather than sequentially.

According to the company, the platform can launch tens of thousands of AI agents during an evaluation. The swarm first maps internal systems and user directories before probing connected assets for weaknesses and testing whether multiple vulnerabilities can be linked together to forge complete attack paths. In one customer engagement, Armadin spun up 26,000 agents to inspect more than 25,000 assets, uncovering 38 verified attack paths in an exercise the company described as the largest autonomous AI attack on record.

Beyond identifying weak points, Armadin's software prioritizes high-severity findings and generates remediation instructions to help enterprise security teams resolve exposures quickly.

"Offense is uniquely advantaged right now," Mandia said in a statement. "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."

Armadin plans to direct the new capital toward expanding its research operations, accelerating AI training workflows, and supporting go-to-market initiatives.