Onyx Security, whose platform enables enterprises to deploy AI agents securely, raised a $113M Series B led by Bessemer, taking its total funding to $153M (Meir Orbach/CTech)

Summary

Onyx Security raised a $113M Series B led by Bessemer, bringing total funding to $153M as it targets secure deployment of AI agents in enterprise environments.

Why it matters

Agent security is becoming a real budget line as companies move from pilots to production. The size and timing of the round suggest buyers are worried about control, permissions, and misuse enough to fund dedicated tooling.

Founder/operator read

• Security for AI agents needs to map to admin controls, policy enforcement, and auditability rather than generic model guardrails.
• Fast follow-on capital means the market is rewarding startups that can define a new category before incumbents catch up.

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