Horizon3 hits $2 billion valuation with $250M Series E as AI threats escalate
Cybersecurity firm Horizon3 has raised $250 million in Series E funding, reaching a $2 billion valuation amid rising demand for AI-driven network security. The company's platform, NodeZero, focuses on continuous, automated vulnerability testing to help enterprises defend against increasingly sophisticated AI-powered cyberattacks.
Why it matters
As AI tools lower the barrier for cyberattacks, the market for automated, AI-based defensive security infrastructure is seeing rapid growth and investment.
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 intended scope. Horizon3, which has spent six years building AI specifically designed to probe networks for vulnerabilities in a controlled, authorized manner, is riding growing enterprise demand. With AI-driven attacks accelerating , enterprises are rushing to stress-test their defenses at scale, a gap that traditional security vendors have largely left unfilled.
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