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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 Security awareness training providers and companies based in the United Kingdom.
| Company | Category | Based in | Founded | Ownership |
|---|---|---|---|---|
 Bondgate IT Bondgate IT is a managed service provider founded in 1998. | Managed security services | Darlington, United Kingdom | 1998 | Private |
 BSI Group ISO/IEC 27001 certification audits and information security training from the UK national standards body, which also certifies quality, safety and medical devices. | Compliance audits (SOC 2, ISO 27001) | London, United Kingdom | Private | |
 CybSafe CybSafe provides an AI-powered platform that helps organisations measure and change security behaviours to reduce breaches. | Security awareness and human risk | London, United Kingdom | 2017 | Private |
 Equilibrium Security CREST-accredited Birmingham-based cyber security consultancy delivering penetration testing, social engineering assessments, and Cyber Essentials certification for public and private sector clients. | Penetration testing | Birmingham, United Kingdom | 2012 | Owned by Omni Cyber Security |
 GTMaritime GTMaritime provides secure communication and cybersecurity software for maritime IT teams. | Email security | Warrington, United Kingdom | Owned by Valstone | |
 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 |
 Littlefish Littlefish provides managed IT services, cyber security, digital solutions, and data and AI services to organisations. | Managed security services | Nottingham, United Kingdom | 2003 | Owned by Bowmark Capital |
 Mimecast Mimecast provides email security and human risk management services for organisations. | Email security | London, United Kingdom | 2003 | Owned by Permira |
 OSINT Industries OSINT Industries provides open-source intelligence tools for online investigations. | OSINT tools | London, United Kingdom | Private | |
 Sencode CREST-accredited North East England penetration testing specialist founded in 2019, offering accessible and transparent security testing with free retests and a strong focus on social engineering. | Penetration testing | Stockton-on-Tees, United Kingdom | 2019 | Private |