Armadin said on Thursday that it raised 2.5 billion.
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. The company will use the money to scale its platform, research, training and go-to-market efforts.
Investors have poured large sums into early-stage startups building defenses against AI-driven cyberattacks.