Horizon3.ai Raises Fresh Capital to Expand AI-Driven Security Operations

Horizon3.ai is raising $100 million in new funding, with $73 million already secured according to a recent SEC filing, reports TechCrunch. The round is led by NEA, which has been active in cybersecurity investments this year. Horizon3.ai is said to be nearing a $750 million valuation as it continues to gain traction in the threat detection and offensive security space.

The San Francisco-based company is best known for its autonomous penetration testing platform, designed to simulate real-world attack scenarios and help organizations identify vulnerabilities before attackers do. Founded in 2019, the company has deep security expertise with automation to offer proactive defense capabilities with capabilities that address growing concerns around AI-powered cyberattacks.

This round builds on Horizon3.ai’s previous Series C funding of $40 million in 2023, which focused on expanding research, engineering talent, and partner channels. Since then, the company has secured FedRAMP authorization, opening the door to federal contracts, and reported triple-digit year-on-year revenue growth earlier in 2025. It now claims $30 million in annual recurring revenue.

For NEA, this is the second cybersecurity bet in recent weeks, following its investment in Veza. The interest signals continued investor confidence in companies offering autonomous and AI-enhanced security solutions, particularly those that can scale across both commercial and government sectors. Horizon3.ai’s momentum suggests that offensive security is gaining ground as a necessary component in modern cyber defense strategies.