Armadin, an AI-native cybersecurity company focused on autonomous security, has secured $255.5m in a Series B funding round that pushes its valuation beyond $2.5bn, only seven months after it launched.
Andreessen Horowitz (a16z) and Accel jointly led the investment, with Bain Capital Ventures (BCV) and Redpoint joining as new backers. Several existing investors also took part again, including 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins and Menlo Ventures. The latest round takes the total capital raised by Armadin to $445m.
The company plans to put the fresh capital towards expanding its agentic security platform, as well as growing its research, training and go-to-market operations.
Since coming out of stealth, Armadin has been carrying out agentic attack campaigns in live environments for Fortune 500 businesses and government clients. The company argues that frontier AI models are shrinking the window between a vulnerability being disclosed and a functioning exploit appearing, leaving occasional penetration tests unable to keep up. Traditional scanners present a separate problem, as they assess every finding on its own rather than in context.
To address this, Armadin uses an autonomous group of specialised agents that think like an experienced attacker across an organisation’s attack surface. These agents link together weaknesses that may each appear minor into confirmed kill chains, which can stretch from unauthenticated remote code execution at the network edge, through lateral movement, all the way to a complete cloud takeover. Security teams in enterprises and government can then view the precise routes an attacker could exploit in their live systems, understand the potential damage of each one, and shut them down before they are used.
Armadin describes itself as a provider of an offensive security platform designed to find and remove the exploitable risks within an organisation. With AI-driven threats on the rise, the firm aims to help enterprises take a proactive stance on securing their environments. Its platform delivers what it calls AI Hyperattacks to uncover new attack paths ahead of adversaries. The company is headed by CEO Kevin Mandia and brings together engineers, researchers and hackers.
Armadin CEO Kevin Mandia said, “Offense is uniquely advantaged right now. 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. With a16z and Accel co-leading and the support of every investor in this round, we are going to put that offense to work for the enterprises and government agencies defending the world’s most critical systems.”
Accel partner Ping Li said, “Against agentic adversaries, the best defense is a great offense powered by AI. That was our conviction when we led Armadin’s Series A, and it’s even more pressing today. In less than a year, Armadin has set the standard for AI-powered offensive security and remediation across enterprises and governments, and we’re excited to keep partnering with them.”
Copyright © 2026 FinTech Global
Copyright © 2026 RegTech Analyst
