Israeli AI security co Onyx Security raises $113m
Israeli AI cybersecurity startup Onyx Security has raised $113 million in a Series B round led by Bessemer Venture Partners, with participation from Cyberstarts, TCV, and others. The company emerged from stealth four months ago with $40 million, bringing total funding to $153 million. Onyx provides a platform to discover, manage, and govern AI agents, monitoring reasoning processes to prevent malicious actions. Founded in 2024 by CEO Maxim Bar Kogan and Gil Elbaz, the company has over 80 employees and works with Fortune 500 companies. Anthropic integrated Onyx's technology in June. The funds will be used to train proprietary models and accelerate US market expansion.
Israeli AI cybersecurity startup Onyx Security has completed a $113 million Series B financing round led by Bessemer Venture Partners, with participation from Cyberstarts, TCV, Conviction, FirstMark, Vintage Investment Partners, QuantumLight, and G Squared. The investment comes just four months after the company emerged from stealth with $40 million in seed and Series A rounds, bringing total funding to $153 million. Onyx has developed a secure platform that enables organizations to discover, manage, and govern the use of AI agents—both third-party and internally developed. The platform monitors every stage of an agent's reasoning process, identifying malicious or unintended behavior and intervening to prevent harmful actions. Founded in 2024 by CEO Maxim Bar Kogan, a former Unit 8200 officer, and chief AI officer Gil Elbaz, an AI entrepreneur who served in the Israeli Air Force's operational technology unit, Onyx employs over 80 people in Israel, the US, and Canada. The company already works with many Fortune 500 companies. In June, Anthropic announced it had integrated Onyx's technology to help enterprises adopt AI securely. Bar Kogan noted that less than one percent of all actions were performed by AI agents in 2025, but autonomous entities will soon be responsible for the overwhelming majority of digital actions, raising the question of how organizations can ensure legitimacy. The latest investment will be used to train the next generation of proprietary models and accelerate business development and marketing efforts in the US and other markets.