The round represents a significant step up from its $100 million Series D raised in mid-2025, which was led by NEA and valued the company above $750 million. Horizon3.ai’s NodeZero platform replaces traditional annual penetration testing with continuous, autonomous penetration testing powered by AI. AdvertisementNodeZero has executed between 150,000 and 170,000 autonomous penetration tests and is used by more than 3,000 organizations. The company also recently launched NodeZero WebApp Pentesting on July 29, 2026, extending its autonomous testing capabilities to web applications and covering a broader range of attack vectors. Smart contract audits, the crypto world’s version of pentesting, have long suffered from the same limitation as traditional security.