NightDragon and NEA co-lead a $250 million Series E. Two-billion-dollar valuation. Fourteen months after a much smaller number. Horizon3 sells AI that stress-tests defenses on purpose while frontier labs apologize for models that did it by accident. International offices. Heavier R&D. TechCrunch has the tape. It matters because “AI versus AI” security just got a war chest big enough to rearrange budgets. Caveat: fear cycles inflate cyber rounds. Watch retention and renewals, not just the fireworks on announcement day.