HiddenLayer raised $100 million as it claims 10x ARR growth securing AI agents

HiddenLayer announced a $100 million Series B on September 2, 2026, led by Delta-v Capital with participation from Ten Eleven Ventures, Morgan Stanley, Microsoft's M12, and Booz Allen Ventures. That brings the Austin-based company's total funding past $155 million. Founded in 2022, HiddenLayer builds security tooling for the full lifecycle of AI systems: discovery, supply-chain security, attack simulation, and runtime protection.

What the new money funds

The round funds a new product, Agent Harness Security, which extends HiddenLayer's runtime protection to AI coding agents while they write, review, and ship code. The risk it targets is agents acting with live permissions inside production systems, where a runtime boundary either holds or it doesn't. Delta-v Capital partner Dan Williams framed the thesis around breadth: HiddenLayer, in his words, "built a platform from the ground up to secure AI across its full lifecycle."

The growth number is self-reported

HiddenLayer says its annual recurring revenue grew more than 10x over the past year, with more than 90% of that growth from new customers signed in the same period. The company reported both figures itself and cites no auditor or third party. CEO Chris Sestito told TechCrunch why the platform generalizes across use cases: "Inference is still inference." A 10x ARR claim from a private security vendor in the middle of a raise is often true and always rounded in the company's favor. Treat it the way you would a vendor's self-reported benchmark.