
Exclusive: Horizon3.ai raises $100M Series D
Why it matters: AI is making cyberattacks faster and more sophisticated — and Horizon3.ai is aiming to even the playing field.
How it works: Horizon3.ai's penetration testing platform — NodeZero — uses AI to find and exploit attack paths in production systems so teams can fix issues.
The platform also collects training data used to improve its own algorithms and increase defenses.
Zoom in: SignalFire, Craft Ventures and 9Yards Capital also participated in the round, which brings the company's total funding to $180 million.
By the numbers: Horizon3.ai is experiencing 100% ARR growth year to year and is now Rule of 40-positive.
The startup's platform is used by 3,000 organizations — including national defense partners — and is more than doubling its customer base annually.
State of play: The penetration testing market seems to be attracting investors.
Strike Security raised a $13.5 million Series A led by FinTech Collective in March.
Threat level: A recent survey found that almost 74% of participants say AI-powered threats are a major challenge for their company.

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