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 Application security vendors 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 | |
 Aardwolf Security Boutique UK penetration testing consultancy in Milton Keynes specialising in manual, expert-led security assessments across web applications, APIs, cloud, and mobile platforms. | Penetration testing | Milton Keynes, United Kingdom | 2015 | Private |
 Secvura Secvura reviews web and SaaS applications for security weaknesses and helps teams fix them. | Application security testing | London, United Kingdom | 2026 | 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 |
 Vulert Vulert monitors open-source dependencies for vulnerabilities and license compliance without accessing source code. | Software supply chain and SBOM | London, United Kingdom | 2022 | Private |