Cybersecurity startup Horizon3 has raised a $250 million Collection E at a $2 billion valuation, greater than tripling its valuation in 14 months. The San Francisco-based agency drew backing from returning buyers NightDragon and NEA.
The funding arrives as two main AI analysis labs disclosed final week that their fashions had breached methods exterior their supposed scope. Horizon3, which has spent six years constructing AI particularly designed to probe networks for vulnerabilities in a managed, approved method, is driving rising enterprise demand. With AI-driven assaults accelerating, enterprises are speeding to stress-test their defenses at scale, a niche that conventional safety distributors have largely left unfilled.
Matt Hartley, the corporate’s chief income officer, stated that its NodeZero platform has two core strengths: It could actually check stay methods with out shutting down operations, a functionality different AI-powered instruments have struggled to ship reliably, and it scans a complete infrastructure constantly moderately than every year, analyzing the complete community moderately than simply 2-3%.
The corporate approached $100 million in annual recurring income final 12 months with 120% year-over-year development,and expects to speed up development this 12 months, Hartley stated.
AI instruments have made it simpler for attackers to develop new exploits rapidly, forcing safety groups to deal with threats sooner than they will repair them. Horizon3 spent roughly $100 million in R&D constructing automated methods designed to remain predictable and controllable, Hartley stated. That’s vital given current breaches at AI labs, which raised questions on whether or not any AI system can actually stay contained.
“It’s additionally making individuals much more cautious about how they deploy AI,” Hartley stated. “We’re getting numerous questions right now round: are you able to detect AI? After all we will. However I believe numerous organizations that rushed to deploy AI throughout the enterprise at the moment are pondering twice concerning the ramifications of these deployments; what if my very own safety workforce will get too aggressive, may there be unintended penalties? So numerous organizations are shifting into what I’d name a daring new world, which is strictly why you want constant, predictable testing from an organization like Horizon3, to know the right way to strengthen your individual defenses towards real-world exploits.”
In a press release, Horizon3 has run 310,000 manufacturing safety exams with zero disruptions, establishing what it calls ‘AI Hackers’, absolutely autonomous penetration testing.
The actual competitors isn’t different software program distributors; it’s the present mannequin, in accordance with Hartley. Most corporations rent human safety corporations to run annual exams and people received’t disappear, he continued. What’s shifting is what purchasers demand after signing up: As an alternative of sampling 5% of infrastructure as soon as yearly, they now need to scan every thing month-to-month or weekly, monitoring whether or not they’re really getting safer.
Horizon3’s founders, Snehal Antani and Anthony Pelletier, met whereas serving at Joint Particular Operations Command, the place they noticed firsthand how useful resource constraints made steady safety testing troublesome. They based Horizon3 to automate these repetitive assessments.
With the funding, Horizon3 is increasing internationally,together with new workplaces in Amsterdam (in June 2026), Australia, and Singapore, whereas constructing a companion community and sustaining substantial R&D spending.
Strategic buyers now embody Singapore’s EDBI, protection contractor SAIC, and Qualcomm, signaling that the vulnerability they’re addressing extends properly past any single sector.
Horizon3 has roughly 7,200 to 7,300 clients, starting from managed service suppliers serving small companies to Fortune 10 enterprises. The corporate claims an addressable market of tens of billions of {dollars}, a determine that aligns with trade estimates of the broader cybersecurity market, valued at $271.9 billion in 2025 and projected to achieve $663.2 billion by 2033, in accordance with Grand View Analysis.
If you buy by means of hyperlinks in our articles, we might earn a small fee. This doesn’t have an effect on our editorial independence.
