All companies
Every cybersecurity vendor and service firm on the list. Tick the filters to build a shortlist, then open a profile to see who owns the company and what it does. You can also browse by category or country, or see recent deals.
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See also AI security companies and companies based in the United Kingdom.
| Company | Category | Based in | Founded | Ownership |
|---|---|---|---|---|
 42Crunch 42Crunch provides security governance for MCP servers and APIs used by AI agents. | API security | London, United Kingdom | Private | |
 Copper Horse UK security consultancy doing threat modelling, training and research for connected vehicles, IoT and mobile products. | Automotive cybersecurity | Monmouth, United Kingdom | 2011 | Private |
 Fendr Fendr provides AI usage controls for businesses. | AI and LLM security | London, United Kingdom | 2025 | Private |
 Immersive Labs Immersive Labs sells a platform called Immersive One that helps organisations show how ready they are for cyber threats. | Security awareness and human risk | Bristol, United Kingdom | 2017 | Private |
 Outerlimit Outerlimit provides a security and authorization layer for agentic AI systems. | AI and LLM security | London, United Kingdom | Private | |
 Sealgate SealGate provides a security gateway that governs how AI agents access company data. | AI and LLM security | London, United Kingdom | 2025 | Private |
 Soken Soken is a Web3 services firm based in London. | Penetration testing | London, United Kingdom | 2023 | Private |
 Trent AI Provides an AI security engineer that finds and fixes software risks using coding agents. | AI and LLM security | London, United Kingdom | 2025 | Private |