HiddenLayer

About HiddenLayer

Financials

Dated, source-cited figures. Estimates are marked.

Products by HiddenLayer

All products by HiddenLayer reviewed by our AI panel of experts.

HiddenLayerAI Security

Security platform for AI models, agents, and applications

Free6.9/10

Competitive Landscape

Who HiddenLayer competes with, and how they differ.

Palo Alto Networks8.2/10

Bought Protect AI in 2025 and folded it into Prisma AIRS, so it sells model scanning, AI red teaming and runtime AI protection as a module of an enterprise security platform customers already own. HiddenLayer sells the same lifecycle as a standalone product and wins on depth of adversarial-ML research rather than platform bundling.

1 product reviewed on TopReviewed

Z

Zenity7.0/10

Zenity started in low-code/no-code and copilot governance and now secures AI agents built on Microsoft Copilot, ServiceNow and similar business platforms. HiddenLayer covers the model supply chain and custom-built agents as well, where Zenity is strongest inside packaged enterprise agent ecosystems.

1 product reviewed on TopReviewed

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Noma Security

The closest independent pure-play: an AI security platform spanning discovery, posture, model supply chain and agent runtime, funded by a $100M round in 2025. Noma leads with AI/ML supply-chain posture for data and MLOps pipelines; HiddenLayer leads with detection and response and its own adversarial-AI threat research.

Promptfoo8.5/10

Open-source-first LLM evaluation and red teaming that developers run in CI against their own prompts and applications. It overlaps only HiddenLayer's AI Attack Simulation module and offers no runtime enforcement, model scanning or AI discovery.

1 product reviewed on TopReviewed

CrowdStrike Holdings, Inc.8.3/10

Approaches AI security from endpoint and cloud incumbency, extending Falcon with AI model scanning and AI security posture management for customers already standardized on its agent and console. HiddenLayer is AI-native and sells to AI and platform teams as well as the SOC, including federal buyers CrowdStrike reaches through different channels.

1 product reviewed on TopReviewed

Company Timeline

Key milestones in HiddenLayer's history, with sources.

1. Aug 18, 2026Partnership

   Selected for the U.S. Department of Energy's $60M Prometheus initiative

   HiddenLayer joined Prometheus, the first Phase II award under the DOE Genesis Mission, which is slated for $60 million over three years and is led by Idaho National Laboratory with Oak Ridge, Argonne and Sandia. HiddenLayer contributes AI security expertise across nuclear-energy AI applications alongside more than 20 industry partners.

   hiddenlayer.com
2. Aug 3, 2026Launch

   Launched Agent Harness Security for AI coding agents

   The product extends the AI Security Platform's Runtime Security module into coding-agent harnesses, hooking each agent's native surface to detect prompt injection, redact secrets before they reach the model and block unsafe shell commands. It shipped as a stand-alone solution.

   hiddenlayer.com
3. Jun 29, 2026Partnership

   Collaboration with Cohere to secure the North agent platform

   HiddenLayer and Cohere paired the North enterprise agent platform with HiddenLayer's runtime protection against prompt injection, data leakage and malicious tool use. HiddenLayer evaluated and deployed North internally before the announcement.

   hiddenlayer.com
4. Mar 23, 2026Launch

   Released agentic AI runtime security capabilities

   The next generation of the AI Runtime Security module added agentic runtime visibility, agentic investigation and threat hunting, and agentic detection and enforcement, targeting how autonomous agents behave and act rather than only model inputs and outputs.

   hiddenlayer.com
5. Apr 25, 2025Milestone

   Published the Policy Puppetry universal prompt injection technique

   HiddenLayer researchers disclosed Policy Puppetry, a prompt-injection technique that frames prompts as policy files to override instructions and bypass safety alignment. The company reported it worked against all major generative AI models.

   securityweek.com
6. Apr 22, 2025Launch

   Released AISec Platform 2.0

   Announced ahead of RSAC 2025, version 2.0 added Model Genealogy for model lineage tracking and an automatically generated AI Bill of Materials for every scanned model, plus expanded threat intelligence and red-teaming telemetry dashboards.

   hiddenlayer.com
7. Feb 27, 2024Milestone

   Disclosed Hugging Face conversion-service supply chain flaw

   HiddenLayer researchers showed the Hugging Face Safetensors conversion service could be abused to hijack models submitted for conversion and to send attacker-controlled pull requests to any repository on the platform while masquerading as the conversion bot.

   thehackernews.com
8. Dec 19, 2023Milestone

   Authorized as a CVE Numbering Authority

   The CVE Program authorized HiddenLayer as a CNA, letting it assign CVE IDs to zero-day vulnerabilities in its own products and in third-party software not covered by another CNA. It joined more than 300 authorized organizations across 37 countries.

   hiddenlayer.com
9. Sep 19, 2023Funding

   Series A — $50M co-led by M12 and Moore Strategic Ventures

   Booz Allen Ventures, IBM Ventures, Capital One Ventures and Ten Eleven Ventures also participated. HiddenLayer described it as the largest Series A raised that year by a cybersecurity company focused on protecting AI, earmarked for headcount, go-to-market and the MLSec Platform.

   hiddenlayer.com
10. Apr 24, 2023Milestone

    Named Most Innovative Startup at the RSA Conference 2023 Innovation Sandbox

    HiddenLayer won the RSA Conference Innovation Sandbox Contest, the industry's best-known startup competition, for its machine learning detection and response approach to defending AI models.

    hiddenlayer.com
11. Jul 19, 2022Funding

    Seed — $6M, emerging from stealth

    HiddenLayer exited stealth with $6 million in seed funding from Ten Eleven Ventures, Secure Octane and other investors. It was pre-revenue with 11 employees and several design partners at the time.

    techcrunch.com
12. March 2022Founded

    Founded in Austin, Texas

    Chris "Tito" Sestito, Tanner Burns and Jim Ballard founded HiddenLayer in March 2022. All three had worked in threat research and engineering at Cylance, BlackBerry and Qualys, and built the company around defending machine learning models from adversarial attack.

    hiddenlayer.com