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HiddenLayer
AI security platform for agentic, generative and predictive models
About HiddenLayer
HiddenLayer is an Austin-based AI security company that protects agentic, generative and predictive AI applications across discovery, supply-chain scanning, attack simulation and runtime protection, without requiring customers to hand over model weights or training data. Co-founded by CEO Chris Sestito, HiddenLayer extends classic model defence to prompt injection, agent manipulation and malicious tool use, and has grown ARR more than 10× with new customers across financial services, technology, defence and intelligence; press also cites support for a frontier model provider with hundreds of millions of weekly users. Researchers associated with the company report dozens of patents and contributions to bodies such as CISA/JCDC, MITRE, NIST and OWASP. After a prior $50 million Series A, HiddenLayer raised a $100 million Series B in September 2026 led by Delta-v Capital, with Ten Eleven Ventures, Morgan Stanley, M12 (Microsoft's venture fund) and Booz Allen Ventures participating, to deepen Agentic Runtime Security and Agent Harness Security and expand enterprise and EMEA go-to-market. Sources: HiddenLayer 2 Sep 2026; TechCrunch 2 Sep 2026.
Source: Dealroom company dataAt a glance
- Status
- Operational
- Founded
- 2022
- Headquarters
- Austin, United States
- Employees
- 170
- Open positions
- 4
- Dealroom signal
- 75.1/100
- Industry
- Security
- Sub-industry
- Device security & Antivirus
- Sector
- Core AI, Cybersecurity, AI Security, MLops, AI Model Deployment and Monitoring
- Technology
- Artificial Intelligence, Machine Learning
- Business model
- SaaS
- Client focus
- b2b
- Investment activity
- 1 company, latest Oct 2025
- Capital deployed
- $2.5M
- Preferred round
- SEED
Knowledge graph
More headlines
Funding history
Company financing events and reported valuations.
| Deal type | Date | Amount | Valuation | Investors | Source |
|---|---|---|---|---|---|
| SERIES AOther financing | Sep 2023 | $50M | $200M | Capital One Ventures · Moore Strategic Ventures · IBM · Booz Allen Hamilton | ↗ |
| SEEDOther financing | Jul 2022 | $6M | $24M | Secure Octane · TenEleven Ventures | ↗ |
Financials
Revenue, earnings and other financial measures where available. Years marked “E” are estimates.
Growth signals
Latest recorded traffic for HiddenLayer is 49K monthly website visits, up 48.5% over the last three months. HiddenLayer's team grew 3% over the past year.
Open positions
Similar companies
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Investments and acquisitions
Recent portfolio relationships for companies that also act as investors or acquirers.
Investors
From Dealroom's funding and investor records, grouped by the round each investor first entered.
Seed2 investors entered at this stage
TenEleven Ventures
Secure Octane
Series A5 investors entered at this stage
Moore Strategic Ventures
M12
Capital One Ventures
IBM
Booz Allen Hamilton
Source: Dealroom Talent Intelligence.
Global footprint
team presence
Market sentiment
An AI-synthesised read of the highest-engagement posts about HiddenLayer on X, ranked by likes and reposts, corporate channels excluded.
Reading the room on X — pulling top posts and synthesizing themes…
Source: X recent search ranked by engagement (likes + retweets) · Synthesis by Claude · Cached for 1 hour
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