Autonomous Security Company Horizon3.ai Raises $100M

The Series D round enables the company to scale its operations and expand its platform into new use areas.

Written by Built In Staff, With AI
Published on Jun. 10, 2025
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REVIEWED BY
Ashley Bowden | Jun 10, 2025

Horizon3.ai, a San Francisco company offering an autonomous security platform, has secured $100 million in Series D funding, with NEA leading the round. The company’s NodeZero solution serves more than 3,000 organizations across the globe.

Working to help security teams reduce threat exposure over time, NodeZero uses AI and reinforcement learning to continuously identify and exploit real-world attack paths. It’s designed to help teams fix only genuine risk issues and avoid spending time on false positives and checking compliance requirements.

The company will use its fresh capital to scale its operations through partnerships; expand into new product areas such as web application pentesting, vulnerability management and precision defense; and further penetrate the federal market.

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This article was written by Writer, a generative AI tool, using information from press releases and company blogs provided by our staff. All content was reviewed by a Built In editor and went through a fact-checking process to ensure accuracy. Errors can be reported to our team at [email protected].

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