HiddenLayer Raises $100M for AI Agent Security

In a significant validation of the rapidly evolving AI security sector, HiddenLayer has successfully closed a $100 million Series B funding round. The substantial capital infusion, led by Delta-v Capital, with crucial participation from Ten Eleven Ventures, Morgan Stanley, M12 (Microsoft’s Venture Fund), and Booz Allen Ventures, underscores the escalating demand for robust defenses against novel cyber threats targeting artificial intelligence systems.

This latest funding propels HiddenLayer's total capital raised to $156 million, following a $50 million Series A in 2023 and a $6 million seed round in 2022. The company's impressive growth trajectory is highlighted by a more than 10x increase in annual recurring revenue over the past year. HiddenLayer has expanded its customer base to include over 50 new enterprise clients across diverse sectors such as finance, insurance, government, pharmaceuticals, and defense, alongside significant international brands and a major frontier model provider serving over 700 million weekly users.

The core of HiddenLayer's mission addresses the unique vulnerabilities introduced by autonomous AI agents, which are increasingly integrated into enterprise workflows. Unlike traditional security solutions designed for static code and infrastructure, HiddenLayer's platform offers comprehensive protection across the AI lifecycle. This includes securing the AI supply chain, detecting and mitigating adversarial attacks, and providing real-time runtime defense for generative, predictive, and agentic AI applications.

The new funding will be instrumental in advancing HiddenLayer's Agentic Runtime Security capabilities and launching a new product, Agent Harness Security. This innovative solution directly addresses the risks posed by malicious instructions embedded within the vast contextual data that AI coding agents access. A recent demonstration by HiddenLayer illustrated how an agent could be tricked into propagating harmful code across multiple repositories under the guise of a legitimate update, showcasing the critical need for real-time monitoring and intervention.

Founded in 2022 by former Cylance threat researcher Chris Sestito and colleagues Tanner Burns and James Ballard, HiddenLayer emerged from firsthand experience with the limitations of existing security frameworks against sophisticated AI manipulation tactics. The company's deep technical expertise is further evidenced by its extensive patent portfolio, with 39 granted and 65 pending patents, and its foundational contributions to AI security frameworks like the Adversarial Prompt Engineering (APE) Taxonomy and collaborations with bodies such as CISA and MITRE.

The AI security market is experiencing intense activity, with both acquisitions and substantial funding rounds becoming commonplace. While major players like Check Point, Palo Alto Networks, and Cisco have recently acquired AI security startups, HiddenLayer's significant Series B round positions it for continued independent growth. This funding environment reflects a broader market trend where the proliferation of AI necessitates specialized security solutions, with companies like Alice and Horizon3 also securing substantial investments to address emerging threats.

Looking ahead, HiddenLayer plans to bolster its leadership team, with the recent appointment of Mike Gesnaldo as Chief Revenue Officer, and aims to expand its international presence, particularly in Europe and the EMEA region, while deepening its channel partnerships. This strategic expansion, fueled by significant investor confidence, signals HiddenLayer's intent to become a dominant force in securing the future of enterprise AI.