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AI cybersecurity startup Armadin valued at over $2.5 billion after new funding round

By Thomson Reuters Oct 1, 2026 | 5:43 AM

Oct 1 (Reuters) – Armadin said on Thursday that it raised $255.5 million in a ​Series B funding round, ‌which values the AI cybersecurity company at more than $2.5 billion.

Investors have poured large sums into ‌early-stage ​startups building defenses ⁠against AI-driven cyberattacks.

• ⁠Andreessen Horowitz and Accel co-led the round, joined by new investors Bain Capital ​Ventures and Redpoint as well as existing backers, ⁠including Google Ventures, ⁠Kleiner Perkins, Menlo Ventures ​and In-Q-Tel

• The round took ​total funding to $445 million, Armadin ‌said

• The company will use the money to scale its platform, research, training ⁠and go-to-market efforts

• Armadin uses a swarm of AI agents that ⁠act ‌like hackers to find ⁠weaknesses

• The company ​was ‌founded by CEO Kevin ​Mandia, who ⁠also founded cybersecurity firm Mandiant and later sold it to Google

(Reporting by Anzar Mehraj in Bengaluru; Editing by ​Joyjeet Das)