Horizon3, a leader in AI-native proactive security, has successfully closed a $250 million Series E funding round, catapulting its valuation to over $2 billion. The oversubscribed round was co-led by existing investors NightDragon and NEA, highlighting strong confidence in the company's autonomous security validation platform. This significant capital injection is earmarked to accelerate global expansion and combat the rising tide of AI-driven cyberattacks.
A Surge in Proactive Security Demand
The company has experienced remarkable growth, with a 120% year-over-year increase in annual recurring revenue and a customer base now exceeding 7,000 organizations. This expansion reflects a critical market need for its NodeZero platform, which autonomously tests security postures against sophisticated threats. Horizon3's solution is trusted by major financial institutions, healthcare networks, and several Fortune 10 enterprises.
NodeZero operates by safely attacking an organization's own production environment to identify exploitable weaknesses before adversaries can. It reveals how attackers chain together misconfigurations and identity gaps to compromise critical systems, providing clear remediation guidance. The platform can also deploy optimal honeypots to effectively detect and prove the presence of AI attackers within a network.
Strategic Investment and Board Enhancement
The funding round saw robust participation from a syndicate of new and returning investors, underscoring broad market validation for Horizon3's approach. Dave DeWalt, CEO of co-lead investor NightDragon, noted that the future of cyber warfare is "AI vs. AI" and that Horizon3's platform is reshaping global data defense. This investment solidifies the company's leadership in the proactive security space.
As part of the investment, Dave DeWalt and NightDragon Managing Director Morgan Kyauk will join Horizon3’s Board of Directors. Kyauk praised the company for its "textbook operational excellence" and highly efficient, scalable go-to-market motion. Their expertise will be instrumental in guiding the company's next phase of strategic growth and market penetration.
Fueling Future Growth and Innovation
Horizon3 plans to deploy the new capital across three key strategic priorities to maintain its rapid momentum. The company will aggressively scale its sales, marketing, and channel operations to meet surging global demand. It also intends to pursue strategic international expansion into Singapore and Australia while deepening its presence across EMEA.
A significant portion of the funding will accelerate the product roadmap, focusing on next-generation innovation. The core objective is to build a continuous learning loop between the platform's AI attackers and new AI defenders. This includes developing autonomous blue-team agents capable of directly remediating vulnerabilities identified during NodeZero's penetration tests.
This $250 million investment marks a pivotal moment for Horizon3, solidifying its position as a definitive leader in the autonomous security market. The capital will empower the company to scale its operations and enhance its innovative platform amid increasingly complex cyber threats. Ultimately, Horizon3 aims to shift the focus from merely finding vulnerabilities to rapidly fixing the exploitable problems that matter most to an organization's security.