California-Based Armadin Raises $255.5M in Series B Funding

Armadin, a Palo Alto, CA-based provider of an AI-native offensive cybersecurity platform, has raised $255.5 million in a Series B funding round, co-led by Andreessen Horowitz (a16z) and Accel, bringing the total amount to $445 million.

The round also saw participation from Bain Capital Ventures (BCV), Redpoint, 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins, and Menlo Ventures.

The company intends to use the funds to scale its agentic security platform, as well as its research, training, and go-to-market efforts.

What is Armadin?

Armadin provides an AI-powered cybersecurity platform designed to identify and eliminate exploitable security risks.

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Its platform uses autonomous AI agents to simulate sophisticated cyberattacks across an organization's attack surface. The agents can connect multiple weaknesses to identify complete attack paths that could lead to larger compromises.

The platform helps enterprise and government security teams understand how attackers could move through their systems and the potential impact of those attack paths.

How Much Funding Has Armadin Raised?

Armadin has raised $255.5 million in its latest Series B funding round.

The latest round brings the company's total funding raised to $445 million.

The provided information does not include details of previous funding rounds.

Who Invested in Armadin’s Series B?

The Series B round was co-led by Andreessen Horowitz (a16z) and Accel.

Other participating investors included Bain Capital Ventures (BCV), Redpoint, 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins, and Menlo Ventures.

Why the Funding Matters

Armadin will use the new funding to scale its agentic security platform.

The company also plans to invest in research, training, and go-to-market efforts as it expands its cybersecurity operations.

Who founded Armadin?

Armadin was founded by Kevin Mandia, Travis Lanham, Evan Peña, and David Slater.

The company is based in Palo Alto, California.

"Offense is uniquely advantaged right now," said Kevin Mandia, CEO of Armadin. "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.

"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," said Ping Li, Partner at Accel. "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."

Market and Business Growth

Seven months after emerging from stealth, Armadin is running agentic attack campaigns in production for Fortune 500 enterprises and government customers.

Its platform uses specialized AI agents to identify attack paths by connecting multiple vulnerabilities across an organization's systems.

Armadin says its platform can identify attack chains ranging from remote code execution at the perimeter through lateral movement and potential cloud compromise.

What Happens Next?

Armadin plans to scale its agentic security platform while expanding its research, training, and go-to-market operations.

The company will continue developing AI-powered offensive security capabilities to help enterprises and government organizations identify exploitable risks before attackers can use them.

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