Horizon3 hits $2 billion valuation with $250M Series E as AI threats escalate | TechCrunch0

• AI, ai apps, ai coding, ai coding assistant, ai dictation, AI inference, ai music, AI Pope, AI regulation, ai safety, ai security, ai-agents, ai-chatbot, Artificial Intelligence, artificial-intelligence, ArtificialIntellgence, Big Tech, big-tech, Biotech & Health, brain tech, Business / Artificial Intelligence, Business / Big Tech, CoECI News, Earth Science Technology Office, Energy & Environment Newsletter, Fintech, Gaming News Roundup, Gear / Gear News and Events, Global, Global Precipitation, global warming, globalstar, HealthTech, healthtech startups, Home, Horizon3, Horizon3.ai, House, ip-tech, News, newsletter, Newsletters, Nexstar Media Wire News, Opinions - Technology, People News, Photovogue / Editorial / News, Politics / Politics News, Property / News, Reviews, Security, Startups
• August 3, 2026

Cybersecurity startup Horizon3 has raised a $250 million Series E at a $2 billion valuation, more than tripling its valuation in 14 months. The San Francisco-based firm drew backing from returning investors NightDragon and NEA. The funding arrives as two major AI research labs disclosed last week that their models had breached systems outside their