HiddenLayer raises $100 million in Series B led by Delta-v Capital

HiddenLayer said on Sept. 2, 2026, that it raised $100 million in Series B funding led by Delta-v Capital, with participation from Ten Eleven Ventures, Morgan Stanley, M12, Microsoft’s Venture Fund and Booz Allen Ventures.

The Austin, Texas-based company said the money will support expansion of its AI security platform as more enterprises deploy agentic systems and autonomous coding tools. HiddenLayer said it is adding Agentic Runtime Security and a new product called Agent Harness Security, which it described as extending runtime security to AI coding agents.

Why it matters

HiddenLayer said the funding reflects investor interest in companies focused on AI security as firms use AI systems in daily operations. The company said Agent Harness Security is aimed at enterprises that are bringing autonomous coding agents into their technology stacks.

Delta-v Capital partner Dan Williams said classic security products were designed for code and infrastructure, not for models that can be poisoned, hijacked or manipulated through inputs.

Background and context

HiddenLayer said its annual recurring revenue grew more than 10 times over the past year and that it signed more than 50 new platform customers. The company said those customers span securities brokerage, banking, insurance, accounting, government, technology, IT services, pharmaceuticals, airlines, and U.S. defense and intelligence.

The company also said it supports a leading frontier model provider that secures more than 700 million weekly users. HiddenLayer said its researchers hold 39 granted patents and 65 pending patents, and that they developed the first comprehensive Adversarial Prompt Engineering taxonomy.

In the release, HiddenLayer said its work involves CISA/JCDC, MITRE, NIST, OWASP and OpenSSF. It also said it recently named Mike Gesnaldo as chief revenue officer and plans more hiring and international expansion, starting with Europe and the wider EMEA region.

What officials said

HiddenLayer co-founder and CEO Chris Sestito said the company was founded to support trusted, secure AI use for enterprises and that the new funding will support team and platform growth as agentic AI becomes core to business operations.

Ten Eleven Ventures partner Mark Hatfield said enterprise budgets are shifting because AI security is urgent. Morgan Stanley’s Zheng Wang said HiddenLayer’s platform supports compliant AI adoption.

What happens next

HiddenLayer said the new capital will support product development, hiring and international expansion. The company said its next focus includes Europe and the wider EMEA region.

Sources

• PR Newswire release, Sept. 2, 2026

Editorial note: This article was prepared with AI assistance and includes source attribution for reader review.