UK penetration testing companies

London-based consultancy offering CREST-accredited penetration testing, incident response and PCI compliance.

UK offensive security firm offering CREST-accredited penetration testing and financial-sector threat-led testing (STAR-FS).

UK cyber security consultancy offering CREST-accredited penetration testing and security consultancy.

UK cyber security and data protection consultancy holding CREST accreditation for penetration testing.

UK cyber security consultancy offering CREST-accredited penetration testing, threat-led testing, managed detection and response.

UK cyber security provider offering CREST-accredited penetration testing and compliance services.

UK-based cyber security firm (with UAE and US offices) offering CREST-accredited penetration testing.

UK cyber security firm offering CREST-accredited penetration testing including web and mobile application testing.

UK cyber security group offering CREST-accredited penetration testing, incident response and secure hosting.

UK consultancy offering CREST-accredited penetration testing and security risk management.

UK penetration testing firm offering CREST-accredited infrastructure and web application testing and Cyber Essentials certification.

UK consultancy offering CREST-accredited penetration testing, incident response and information security auditing.

UK penetration testing firm holding CREST accreditation and Cyber Essentials Plus.

UK-headquartered global firm offering CREST-accredited penetration testing, digital forensics and PCI compliance services.

UK boutique penetration testing firm holding CREST accreditation and Cyber Essentials Plus.

UK cyber security specialist offering CREST-accredited penetration testing, social engineering, cloud reviews and wireless auditing.

UK cyber security consultancy offering CREST-accredited penetration testing, threat-led testing and managed detection services.

UK consultancy specialising in CREST-accredited penetration testing and financial-sector threat-led testing (CBEST, GBEST, TIBER-EU).

UK security firm holding CREST accreditation for penetration testing.

UK-headquartered global cyber security firm providing CREST-accredited penetration testing, threat-led testing, incident response and threat intelligence.

UK consultancy offering CREST-accredited penetration testing across web, mobile, infrastructure and specialist areas such as maritime, automotive and aviation.

Cheltenham-based consultancy offering CREST-accredited penetration testing and financial-sector threat-led testing (STAR-FS).

Long-established UK consultancy offering CREST-accredited penetration testing, vulnerability assessment and incident response.

UK offensive security consultancy (formerly WithSecure Consulting) offering CREST-accredited penetration testing and threat-led testing (CBEST, GBEST, TIBER-EU).

UK firm providing CREST-accredited penetration testing alongside the Rootshell vulnerability-management platform.

Cheltenham-based cyber security firm offering CREST-accredited penetration testing.

UK cyber security consultancy offering CREST-accredited penetration testing and vulnerability assessment.

UK information security consultancy providing CREST-accredited penetration testing and Cyber Essentials certification.

UK security firm offering CREST-accredited penetration testing and security certification training.

Cyber division of Thomas Murray offering CREST-accredited penetration testing and incident response.

Cambridge-based cyber security firm offering CREST-accredited penetration testing and managed security services.

Penetration testing provider that traded as Pentest People until 2025 and is now part of WorkNest, listed under WorkNest on the NCSC CHECK register and the CREST Marketplace.