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Horizon3 raises $250M in Series E funding, achieving a valuation exceeding $2B. The round was co-led by NightDragon and NEA, addressing the need for enhanced cybersecurity solutions.

PRIVATEAug 03, 2026

Amount Raised

$250 Million

Round Type

Series E

San FranciscoInformation TechnologyScience And EngineeringSecurityNetwork Security

Investors

New Enterprise AssociatesNightdragon

Description

Horizon3, the AI-Native Proactive Security Company behind NodeZero®, announced a $250 million Series E funding at a valuation surpassing $2 billion. This new capital tripled its valuation from $650 million in the Series D round within just over a year. The successful round was co-led by existing investors NightDragon and NEA, supplemented by seven new investors and five returning backers. This investment highlights the growing demand for advanced cybersecurity solutions in a rapidly evolving landscape.

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Company Information

Company

Horizon 3 AI

Location

447 Battery Street

San Francisco, California, United States

About

Horizon3.ai's mission is to help you find and fix attack vectors before attackers can exploit them. NodeZero, our autonomous penetration testing solution, is a true self-service SaaS offering that is safe to run in production and requires no persistent or credentialed agents. You will see your enterprise through the eyes of the attacker, identify your ineffective security controls, and ensure your limited resources are spent fixing problems that can actually be exploited. Founded in 2019 by industry, US Special Operations, and US National Security veterans, Horizon3.ai is headquartered in San Francisco, CA, and made in the USA.

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Horizon 3 AI raised. Fundz records a round at a median of 3.6 minutes from the SEC filing, with the decision-maker attached.

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