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This funding surge reflects an urgent market shift where enterprises prioritize continuous, automated red-teaming over traditional annual pentesting in response to accelerating AI-driven attacks. Horizon3's ability to stress-test live infrastructure without operational disruption addresses a critical gap left by legacy security vendors facing increasingly sophisticated exploits generated by generative models. The company's growth underscores the industry-wide recognition that static defense mechanisms are insufficient against adversarial systems capable of evolving faster than human teams can patch them.
Horizon3 hits $2 billion valuation with $250M Series E as AI threats escalate

Cybersecurity startup Horizon3 raised $250 million at a $2 billion valuation as companies want continuous, AI-powered security validation instead of annual pen testing.
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…
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