# Horizon3.ai hits $2 billion valuation in $250 million funding round

> Source: <https://www.helpnetsecurity.com/2026/08/03/horizon3-ai-250-million-funding/>
> Published: 2026-08-03 13:21:57+00:00

Horizon3.ai has announced a $250 million Series E at a valuation of more than $2 billion, tripling its valuation from $650 million at Series D in just over a year. The oversubscribed round was co-led by existing investors NightDragon and NEA, with participation from seven new investors and five returning backers. The capital underscores accelerating global demand for safe, autonomous security validation as AI-driven cyberattacks escalate. “We invented the concept of AI Hackers and spent … [More ](https://www.helpnetsecurity.com/2026/08/03/horizon3-ai-250-million-funding/)

The post [Horizon3.ai hits $2 billion valuation in $250 million funding round](https://www.helpnetsecurity.com/2026/08/03/horizon3-ai-250-million-funding/) appeared first on [Help Net Security](https://www.helpnetsecurity.com).