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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•6 days ago

Amount Raised

$250 Million

Round Type

Series E

San FranciscoSecurityNetwork Security

Investors

NeaNight Dragon

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.

Company Information

Company

Horizon3.ai

Location

San Francisco, California, United States

About

Horizon3.ai’s NodeZero® Offensive Security Platform enables continuous exposure management across production infrastructure. By leveraging autonomous penetration testing, emerging threat intelligence, threat detection, and unified reporting, NodeZero helps organizations overcome the challenges of limited security talent and costly, infrequent penetration tests. Founded in 2019 by former industry leaders and U.S. National Security veterans, Horizon3.ai delivers scalable cybersecurity solutions for diverse use cases across all industries, empowering organizations to stay ahead in a rapidly evolving threat landscape.

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