Series B · Cybersecurity

Armadin raises $255.5M Series B co-led by Accel and a16z

The company will expand its autonomous-security platform, research, training and go-to-market teams.

The financing follows Armadin’s March announcement of $189.9 million across seed and Series A funding. That earlier combined figure is a separate event and is not assigned to each of those rounds individually.

Armadin reported agent-led security campaigns in production for Fortune 500 and government customers by the Series B announcement. The new round backs expansion of that operating business and the teams developing and delivering its security agents.

Use of funds

Scale the agentic security platform, research, training and go-to-market teams.

Funding history

Series B · This round$255.5M
Seed+Series A$189.9M

Sources

  1. Armadin Raises $255.5 Million Series B to Scale Effective Autonomous Securityprnewswire.com · Oct 1, 2026