HiddenLayer Lands $100M to Secure AI Deployments

The big picture: AI security startup HiddenLayer has raised $100 million in Series B funding to meet surging enterprise demand for protecting AI models, agents, and workflows. The Austin-based company, which offers tools against adversarial attacks, vulnerabilities, and malicious code injections, saw its annual recurring revenue grow more than 10x over the past year. The round was led by Delta-v Capital, with participation from Ten Eleven Ventures, Morgan Stanley, Microsoft’s M12, Booz Allen Hamilton, and others. HiddenLayer aims to expand its sales, distribution, engineering, and research efforts, with plans for European and EMEA expansion.

Why it matters:

• Exploding Market: The market for securing AI tools is rapidly expanding, with Gartner estimating global spending will reach nearly $4.78 billion by 2027, an 83% increase from 2025.
• Agent Risk: While large-scale AI agent exploits are not yet common, the risk of agents malfunctioning or being manipulated in production is a growing concern for enterprises.
• Significant Traction: HiddenLayer’s substantial ARR growth, now in the ‘tens of millions’ of dollars, demonstrates strong market validation, with over 90% driven by new customer acquisition in the last year.

How it works:

• Evolving Scope: HiddenLayer has extended its existing products—covering discovery, runtime protection, attack simulation, and supply chain security—to address new threats like prompt injection, agent manipulation, and malicious tool use in generative AI.
• Runtime Priority: The company emphasizes runtime security for AI deployments, likening its solutions to traditional endpoint detection and response (EDR) but specifically tailored for AI.
• Open-Source Vulnerabilities: HiddenLayer’s tools scan and parse various AI file frameworks to identify hidden models or malicious code within open-source, open-weight models, ensuring their integrity.

The catch: HiddenLayer faces a competitive landscape, with large cybersecurity firms like Cisco, Palo Alto Networks, and Check Point actively acquiring AI security startups. Other well-funded startups, including Noma and Zenity, are also raising significant capital to address adjacent or overlapping areas. While some AI security features could eventually be bundled into platforms from major providers like Microsoft, OpenAI, and AWS, HiddenLayer believes its focus on governance features such as discovery, identity, and policy controls will remain distinct. The company must prove it can sustain its early lead and expand horizontally into broader cybersecurity domains that increasingly rely on AI.