Obsidian Security Raises $85M Series D to Expand AI Agent Security Platform

Cybersecurity firm Obsidian Security has announced the completion of an $85 million Series D round, with the funding earmarked to expand its AI agent security platform. The news, reported by citybiz, marks one of the larger recent financings in the AI security space.

Based on the public details, the core purpose of the round is to scale the company's AI agent security platform, helping enterprises keep guardrails in place as AI agents move into production at scale.

Over the past year, enterprise AI agents have shifted from demos to production environments, with more and more agents authorized to reach internal systems, handle sensitive data, and complete multi-step tasks on their own.

That spread has opened new attack surfaces: permission abuse, identity impersonation, and data overreach are straining security frameworks built around people and applications.

Obsidian Security is betting that AI agent security will become one of the fastest-growing line items in enterprise security budgets.

The round also reflects a broader investor view: as model capabilities converge, the infrastructure and security layers around AI deployment are emerging as the next area of value.

The next things to watch are how Obsidian Security uses the funding to broaden platform coverage across more agent scenarios, and whether the AI security segment now attracts a fresh wave of funding.