Best CREST Penetration Testing Companies
CREST accreditation is the gold standard for penetration testing quality assurance. CREST-accredited companies undergo rigorous assessment of their testing methodologies, staff qualifications, and data handling practices. Choosing a CREST-accredited provider gives you confidence that your penetration test will be conducted to the highest professional standards.
Below are the top CREST-accredited penetration testing providers, ranked by our comprehensive scoring methodology that evaluates accreditation, team expertise, review quality, and service breadth.
SECFORCE
Leading UK offensive security consultancy based in Canary Wharf, delivering CREST-accredited penetration testing and adversary simulation to organisations with the most demanding security requirements.
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
Nettitude
CREST, CHECK, and CBEST accredited UK consultancy within Lloyd's Register, delivering premium penetration testing for government and critical infrastructure.
NetSPI
Leading penetration testing firm with the Resolve platform for continuous attack surface management, trusted by nine of the top ten US banks.
Trustwave
Global managed security provider with the elite SpiderLabs penetration testing team and deep PCI DSS compliance expertise.
Bridewell
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
Pentest People
CREST and CHECK-accredited UK penetration testing firm with an innovative SecurePortal platform and transparent pricing for mid-market organizations.
WithSecure
Leading European cybersecurity firm offering penetration testing with deep expertise in EU regulatory compliance including GDPR, NIS 2, and TIBER-EU.
Claranet
CREST and CHECK-accredited European managed services provider delivering penetration testing with deep infrastructure and cloud hosting expertise.
Integrity360
CREST-accredited pan-European cybersecurity services provider delivering penetration testing and managed security from Dublin with a strong UK and Ireland presence.
Best CREST Penetration Testing Companies — FAQs
What is CREST accreditation for penetration testing?+
CREST (Council of Registered Ethical Security Testers) is an international accreditation body that certifies the competence and professionalism of cybersecurity service providers. CREST-accredited pen testing companies have demonstrated rigorous standards for methodology, staff qualifications, data handling, and reporting quality.
Why should I choose a CREST-accredited pen testing company?+
CREST accreditation provides assurance that the company follows industry-recognised standards, employs qualified testers, uses proven methodologies, and handles your data securely. Many compliance frameworks and regulators specifically recommend or require CREST-accredited testing.
Is CREST accreditation recognised globally?+
Yes. CREST is recognised internationally and has member companies across the UK, Europe, Asia-Pacific, and the Americas. CREST is particularly well-established in the UK, Australia, and Singapore, and is increasingly recognised in other regions.
What is the difference between CREST and CHECK?+
CREST accredits commercial penetration testing services. CHECK is a UK government scheme operated by the NCSC specifically for testing government systems. Many UK pen testing firms hold both accreditations.