HiddenLayer, the AI security company that protects agentic, generative and predictive AI applications for enterprises, has closed a $100m Series B funding round.
The round was led by Delta-v Capital, with additional backing from Ten Eleven Ventures, Morgan Stanley, M12, Microsoft’s Venture Fund and Booz Allen Ventures.
HiddenLayer plans to put the capital towards expanding its enterprise platform, with a particular focus on its Agentic Runtime Security offering and a newly launched product called Agent Harness Security. The latter builds on the existing Runtime Security module, extending protection to AI coding agents while they operate, and is aimed at businesses bringing autonomous coding tools into their development environments.
The Series B follows a year of rapid expansion for the company. Annual recurring revenue climbed more than tenfold, and HiddenLayer added over 50 new platform customers spanning securities brokerage, banking, insurance, accounting, government, technology, IT services, pharmaceuticals, airlines, and the US defence and intelligence sectors.
Its international customer base grew too, taking in one of the world’s largest pharmaceutical firms alongside several premium automotive and food and beverage brands. Separately, the company also helps a major frontier model provider secure a platform used by more than 700 million people weekly.
Much of this momentum stems from HiddenLayer’s research division, which holds 39 granted patents and a further 65 pending, covering areas such as adversarial detection, model protection and AI threat analysis.
The team built the first Adversarial Prompt Engineering Taxonomy and continues to track emerging risks across generative, predictive and agentic AI, having identified numerous vulnerabilities throughout the AI stack, from foundation models through to supporting tools and infrastructure.
With the new funding, HiddenLayer is prioritising three areas of enterprise exposure: giving organisations real-time visibility into how their AI agents behave in production and the ability to flag or halt misuse; securing the agentic harnesses and autonomous coding agents that increasingly write and deploy code with limited human review; and reinforcing the view that trustworthy AI cannot rely on design-time safeguards alone but must be verified continuously at runtime.
HiddenLayer secures agentic, generative and predictive AI applications across the full AI lifecycle, covering everything from discovery and AI supply chain security to attack simulation and runtime protection.
Chris Sestito, CEO and Co-Founder of HiddenLayer, said, “We set out to pioneer trusted, secure use of AI for enterprises, long before most organizations saw the urgency we do today. This funding lets us keep growing the purpose-built team and platform required to meet that moment as agentic AI becomes core to how enterprises operate.”
Delta-v Capital Partner Dan Williams said, “Traditional security tools were built for code and infrastructure, not for models that can be poisoned, hijacked, or manipulated through their own inputs.
“HiddenLayer built a platform from the ground up to secure AI across its full lifecycle, from the model at its core to the agentic systems being layered on top and whatever architecture comes next. We’ve watched this team turn deep adversarial-AI research into a product CISOs actually rely on, and we’re proud to partner with them.”
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