Top Cybersecurity Companies in the UK

Between them, the 46 cybersecurity companies on this page cover web development (44), web design (41), IT services (36) and iOS app (28). They also list work in United States of America. 46 of them have written a profile you can read before you get in touch.

1. 1

   

   Intellect Security Ltd

   Web Development · Web Design · IT Services

   Intellect Security Ltd is a UK information security provider. It has served clients since 2002 and says it has worked with more than 2,000 customers.

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   Why #1: Based in United Kingdom · Founded 2002 · Client numbers stated on its own website, as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

2. 2

   TT

   TDI (Tetrad Digital Integrity)

   Mobile App Development · Web Development · Web Design · Also in United States of America

   Cybersecurity consultancy offering governance, engineering and performance management to government and commercial clients

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   Why #2: Based in Washington DC, with locations in Maryland, Virginia and the United Kingdom · Founded 2001, as stated on its own website, read 6 Oct 2026

   Not yet on record: client reviews, vetting.

3. 3

   

   Proofpoint

   Web Development · Web Design · IT Services · Also in United States of America

   Proofpoint is a cybersecurity company that focuses on attacks aimed at people rather than machines.

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   Why #3: Office in United Kingdom · Founded 2002, as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

4. 4

   

   Deep Secure

   Mobile App Development · Web Development · Web Design

   Deep Secure is a privately owned cyber security company with its headquarters in Malvern, UK, and a satellite office in London.

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   Why #4: Based in Malvern, United Kingdom · Founded 2009, as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

5. 5

   S

   Secgate

   Web Development · Web Design · IT Services

   Secgate is a cyber security company based in London. Its site says it has helped clients since 2015 and has served customers around the world, including major banks, energy…

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   Why #5: Based in London, UK · Founded 2015, as stated on its own website, read 6 Oct 2026

   Not yet on record: client reviews, vetting.

6. 6

   

   NCC Group

   Web Development · Web Design · IT Services

   NCC Group is a global cyber security and risk mitigation firm headquartered in Manchester, UK.

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   Why #6: Based in Manchester, UK · Team of 2,000+ · Client numbers stated on its own website, as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

7. 7

   

   Sophos

   Web Development · Web Design · IT Services · Also in United States of America

   Sophos is a cybersecurity company that protects laptops, servers, mobile devices and networks against threats such as ransomware, malware, phishing and data theft.

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   Why #7: Based in Oxford, United Kingdom · Client numbers stated on its own website, as stated on its own website, read 5 Oct 2026

   Not yet on record: client reviews, vetting.

8. Also listed, not yet ranked. We hold nothing checkable on these yet that ranks them here: no client review, vetting, award, expert review, or fact stated on their own website (and on a place ranking, where they are based). They follow in order of their TrustList Score. How TrustList ranks · Get vetted, free
9. –

   IS

   Ionx Solutions

   Web Development · Web Design · IT Services

   Ionx Solutions makes security software built around system integrity.

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   On record: In business 24+ years · professional accreditation, as stated on its own website, read 6 Oct 2026

10. –

    

    Boldon James

    Web Development · Web Design · IT Services

    Boldon James specialises in data classification and secure messaging software. It belongs to the QinetiQ group and has around thirty years of experience in the field.

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    On record: In business 30+ years, as stated on its own website, read 5 Oct 2026

11. –

    

    Context Information Security

    Web Development · Web Design · IT Services

    Context Information Security is a cybersecurity consultancy that has operated since 1998. It describes itself as independently run, with backing from a FTSE 250 group.

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    On record: Founded 1998, as stated on its own website, read 5 Oct 2026

12. –

    

    Secon Cyber

    Web Development · Web Design · IT Services

    Secon Cyber is a cyber security firm that works with organisations of different sizes.

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    On record: Founded 1999, as stated on its own website, read 5 Oct 2026

13. –

    

    Cyberfort Group

    Web Development · Web Design · IT Services

    Cyberfort Group is a cyber security company covering the full security lifecycle.

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    On record: In business 20+ years, as stated on its own website, read 5 Oct 2026

14. –

    2S

    2|SEC Consulting

    Web Development · Web Design · IT Services

    2 SEC Consulting is a cyber security and information security consultancy that treats security risk as part of wider business strategy.

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15. –

    

    Barac.io

    Web Development · Web Design · IT Services

    Barac.io is a cybersecurity company focused on threats concealed inside encrypted traffic.

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16. –

    

    Becrypt

    Mobile App Development · Web Development · Web Design

    Becrypt makes high assurance cyber security software, building on a history of products certified by the National Cyber Security Centre.

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17. –

    

    Connected Space Ltd

    Mobile App Development · Web Development · iOS App

    Connected Space Ltd is the company behind Sauron Security, a cyber defence system for enterprise and industrial IoT devices.

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18. –

    

    CriticalBlue

    Mobile App Development · iOS App · Software Development

    CriticalBlue is an Edinburgh software company with a branch office in San Jose, California.

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    On record: Based in Edinburgh, Scotland

19. –

    

    Cybanetix

    Web Development · Web Design · iOS App

    Cybanetix is a cyber security provider that runs managed security services and hosted security monitoring for its customers.

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20. –

    

    Cyber Risk Management Group

    Web Development · Web Design · IT Services

    Cyber Risk Management Group, known as CRMG, is a cyber security and information risk consultancy.

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21. –

    

    Cybereason

    Web Development · Web Design · IT Services · Also in United States of America

    Endpoint protection, managed detection and response, and incident response services for large organisations, now part of LevelBlue

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    On record: Based in Boston, with offices in London, Tel Aviv and Tokyo, as described in earlier…

22. –

    

    CyberOwl

    Web Development · Web Design · IT Services

    CyberOwl provides cybersecurity analytics for operational assets, with a focus on shipping and critical national infrastructure such as utilities.

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23. –

    

    Emerge

    Web Development · Web Design · IT Services

    Emerge is a professional services partner and value-added reseller that sells cybersecurity software.

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24. –

    

    ExtraHop

    Web Development · Web Design · IT Services · Also in United States of America

    ExtraHop sells network visibility and analytics software. It reads traffic across an organisation's network to help security and IT teams find threats and performance problems.

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25. –

    

    Immersive Labs

    Web Development · Web Design · UI/UX Design

    Immersive Labs runs an online platform for building and measuring cyber security skills.

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