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 MDR providers and companies based in the United Kingdom.
| Company | Category | Based in | Founded | Ownership |
|---|---|---|---|---|
Bridewell Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors. | Penetration testing | Bristol, United Kingdom | 2013 | Owned by I-TRACING |
Claranet CREST and CHECK-accredited European managed services provider delivering penetration testing with deep infrastructure and cloud hosting expertise. | Penetration testing | London, United Kingdom | 1996 | Private |
CybaVerse CybaVerse provides a unified cyber security operations platform called CybaOps. | Managed detection and response | Portsmouth, United Kingdom | 2018 | Private |
CyberLab Cardiff-based CREST and CHECK-accredited cyber security company delivering penetration testing, red teaming, and OT security assessments as part of the Chess Group. | Penetration testing | Cardiff, United Kingdom | 2020 | Owned by Chess |
Cydome Provides cybersecurity protection and risk management for maritime vessels, offshore facilities and ports. | OT and ICS security | London, United Kingdom | Private | |
Darktrace Darktrace provides AI-powered cybersecurity solutions that detect and respond to threats across networks, cloud, email, and AI systems. | Network detection and response | Cambridge, United Kingdom | 2013 | Owned by Thoma Bravo |
Deloitte Cyber advisory and managed security services, including managed extended detection and response, cloud security, digital identity and threat intelligence, from a global professional services network. | Managed security services | London, United Kingdom | Private | |
JUMPSEC Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services. | Penetration testing | London, United Kingdom | 2012 | Private |
NCC Group Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and penetration testing services. | Penetration testing | Manchester, United Kingdom | 1999 | Public, NCC |
Pen Test Partners The UK's largest independent security testing firm, renowned for IoT/OT research, CBEST red teaming, and CHECK/CREST-accredited penetration testing across all sectors. | Penetration testing | Buckingham, United Kingdom | 2010 | Private |
Redscan (A Kroll Business) London-based cybersecurity provider, now part of Kroll, delivering CREST-accredited penetration testing, managed detection and response, and incident response with a 550-strong cyber team. | Penetration testing | London, United Kingdom | 2002 | Part of Kroll |
ThreatSpike Red London-based cybersecurity firm offering unlimited, fixed-price penetration testing and red teaming services with ISO 27001 certification and a unique subscription model. | Penetration testing | London, United Kingdom | 2011 | Private |