Onyx Security announced a $113 million Series B funding round led by Bessemer Venture Partners. The round included participation from Cyberstarts, TCV, Conviction, FirstMark, Vintage, QuantumLight, and G Squared, bringing the company’s total funding to $153 million since its founding two years ago.
Onyx said it has grown revenue fourfold since coming out of stealth four months ago. In June, Anthropic announced its integration with Onyx to secure enterprise AI adoption, following dozens of other AI providers already integrated with the platform.
The company said enterprise AI adoption is entering a new phase of sophisticated AI agents that are highly capable yet hard to control. Onyx’s secure AI control plane enables enterprises to discover and control how advanced AI is used in their environment. Using its proprietary models, Onyx monitors each step of agent reasoning and corrects unintended or malicious agent actions.
Onyx said less than 1% of actions were made by agents in 2025, a share the company expects to grow substantially. The company is trusted by dozens of enterprises, including Fortune 500 companies across banking, technology, insurance, energy, and other industries, to provide control over both third-party and internally built agents.
The new capital will be used to train the next generation of Onyx’s proprietary models and to scale its enterprise go-to-market efforts in the United States and beyond.
KEY QUOTE:
In 2025, less than one percent of actions were made by agents. These new autonomous actors will soon be taking the overwhelming majority of actions, which begs the question – how do we guarantee these actions are legitimate?
Maxim Bar Kogan, CEO and Co-Founder of Onyx
