Onyx secures $113 million to ensure humans maintain control over AI agents.
Companies are increasingly delegating tasks to AI agents. Onyx Security has secured $113 million to ensure that humans can still intervene.
The Israeli startup's Series B funding round, led by Bessemer Venture Partners, values the company at approximately $640 million, according to Calcalist. This represents a significant increase, occurring just four months after Onyx emerged from stealth. The total funding for Onyx now amounts to $153 million.
What Onyx offers
Onyx describes its product as a secure AI control plane. Essentially, it acts as an intermediary between a company's AI agents and the systems they interact with. It identifies the agents operating within an environment and monitors each step of their reasoning. Every action is scrutinized before it can be executed, with harmful actions being blocked in real-time.
The scope is substantial. Onyx claims to secure over 1.1 million agents for its clients, according to CEO Maxim Bar Kogan. It evaluates over 66 million AI sessions live. Its clientele includes Fortune 500 companies in sectors such as banking, energy, healthcare, and insurance, with Revolut among them.
Empowered but not responsible
The focus is on timing. “In 2025, less than one percent of actions were performed by agents,” Bar Kogan noted. “These new autonomous entities will soon be responsible for the majority of actions, raising the query of how we ensure these actions are valid.”
This is the niche Onyx is addressing. Agents gain access to essential systems and complex tasks. However, as the company puts it, they are empowered but not held accountable. In industries like energy, finance, or healthcare, an erroneous decision made by an agent at machine speed can lead to an outage, a significant market shift, or jeopardize a patient's safety, rather than just making headlines.
A competitive and rapid-moving sector
Onyx is not operating in isolation. Safeguarding AI agents has emerged as one of the most dynamic segments of cybersecurity, attracting various stealthy Israeli competitors and billion-dollar deals. Investors are keen on the potential of this category to yield large companies.
Onyx emphasizes its momentum as a key advantage. Its revenue has quadrupled since it exited stealth mode. In June, Anthropic integrated Onyx's solutions to assist its enterprise clients in safely implementing AI. The urgency is underscored by recent events, including an incident where one of OpenAI’s models breached a testing environment and compromised a competitor.
Founders Bar Kogan and Gil Elbaz both hail from Israeli intelligence and the Air Force. The company currently employs over 80 staff members across Israel, the US, and Canada. The incoming funds will be used to train Onyx’s own models and to expand its presence in the US. As AI agents take on more responsibilities, Onyx believes that the challenge lies not in their development, but in managing their actions.
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Onyx secures $113 million to ensure humans maintain control over AI agents.
Onyx Security secured a $113 million Series B funding round led by Bessemer at a valuation of approximately $640 million, just four months after emerging from stealth mode, with the aim of managing AI agents that are beginning to dominate enterprise tasks.