Onyx Security on Wednesday announced raising $113 million to secure AI adoption in the enterprise.
The Series B funding round was led by Bessemer Venture Partners, with participation from Cyberstarts, TCV, Conviction, FirstMark, Vintage, QuantumLight, and G Squared.
Onyx has raised a total of $153 million since its founding two years ago, and the latest funding will be used to train its proprietary models and scale its go-to-market efforts.
While the Israeli company did not officially disclose its valuation, the new capital injection reportedly values the startup at an estimated $640 million.
Onyx Security offers a centralized platform that helps organizations identify and regulate the use of advanced AI tools across their networks. The solution is designed to address the risks introduced by highly capable AI agents that are granted access to critical corporate systems without built-in accountability or oversight.
According to the company, the technology relies on its own proprietary models to track an AI agent’s decision-making process at every step, enabling it to intervene and rectify any unintended or malicious behavior as it happens across SaaS, cloud, and endpoint environments.
The solution enables enterprises to find shadow AI implementations, enforce real-time safeguards against threats like prompt injections, and meet regulatory compliance standards.
“As AI agents become embedded in critical business workflows, enterprises need a way to ensure they operate safely, predictably, and within policy,” said Hila Zigman, general partner at Cyberstarts. “Onyx is building the control layer that makes enterprise AI adoption possible at scale. We believe this will become one of the defining security categories of the coming decade.”
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