Kevin Mandia’s new ‘agent swarm’ security startup Armadin raises $255.5M at $2.5B valuation

Julie Bort· Oct 1, 2026 · 9:55 PM UTC ·2 min read · 0 reactions · 0 comments · 127 views

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The Series B round was led by Andreessen Horowitz and Accel, with Bain Capital Ventures, Redpoint, 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins, and Menlo Ventures joining in. The new round comes just six months after Armadin raised a $190 million Series A in March. Armadin is offering enterprises a new kind of always-on security by reimagining defense testing for the AI era.

Key facts

▪The Series B round was led by Andreessen Horowitz and Accel, with Bain Capital Ventures, Redpoint, 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins, and Menlo Ventures joining in.
▪The new round comes just six months after Armadin raised a $190 million Series A in March.
▪Armadin is offering enterprises a new kind of always-on security by reimagining defense testing for the AI era.

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▪ Armadin, started by Mandiant founder Kevin Mandia to build AI cybersecurity agents, raised a $255.5M Series B led by a16z and Accel at a $2.5B valuation (Anzar Mehraj/Reuters) — Techmeme

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In Brief Posted: 2:55 PM PDT · October 1, 2026 Image Credits:TechCrunch / AI generated Julie Bort Kevin Mandia’s new ‘agent swarm’ security startup Armadin raises $255.5M at $2.5B valuation Kevin Mandia, best known as the founder of cybersecurity startup Mandiant that sold it to Google for $5.4 billion in 2022, has raised $255.5 million for his latest startup, Armadin, at a valuation of more than $2.5 billion, the company announced on Thursday. The Series B round was led by Andreessen Horowitz and Accel, with Bain Capital Ventures, Redpoint, 8VC, Ballistic Ventures, Google Ventures, In-Q-Tel, Kleiner Perkins, and Menlo Ventures joining in. The new round comes just six months after Armadin raised a $190 million Series A in March. It has now raised more than $445 million.

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