Onyx Security has raised $113 million in a Series B round led by Bessemer Venture Partners. The funds will go toward the Secure AI Control Plane, a platform for discovering AI agents in enterprise environments.
With this new round, total funding has reached $153 million. In addition to Bessemer, participants include Cyberstarts, TCV, Conviction, FirstMark, Vintage Investment Partners, QuantumLight, and G Squared. The company emphasizes that the round is not about market share in an existing category, but about building a platform that allows people to maintain control as agents take on more tasks.
In March, Onyx Security officially launched with a $40 million funding round raised from Conviction and Cyberstarts. The company is led by Maxim Bar Kogan and Gil Elbaz. Bar Kogan comes from Israel’s Unit 8200 intelligence unit, while Elbaz previously worked as an AI researcher at Nvidia.
The message then is the same as it is now. “Every enterprise is becoming an agent operator, whether they planned to or not,” the company states. According to Onyx, agents now operate across browsers, endpoints, SaaS, and the cloud, exactly where companies deploy their AI programs.
What the platform does
The Secure AI Control Plane for detecting AI agents inspects every action before it occurs. The platform can block, correct, or forward actions to a human for approval. According to Onyx, this happens without slowing down adoption.
Onyx says it now secures more than 1.1 million agents for its customers and inspects more than 66 million AI sessions in real time. Part of the funding will go toward the next generation of proprietary AI models designed to monitor agents’ intent and reasoning. In addition, the company aims to accelerate its go-to-market strategy, particularly in the United States and beyond.
Onyx focuses on sectors that support critical infrastructure: energy, financial services, and healthcare. In these sectors, a single wrong decision by an agent operating at production speed can lead to an outage, a market disruption, or a life being put at risk. According to the company, the Fortune 500 companies it works with are setting the pace for how agent governance is rolled out in practice.