Penetration Testing Providers in London
Europe
London-based penetration testing providers serving the City's financial services sector and broader UK market.
London is one of the world's leading centres for security testing services.
Top Accreditations in London
Compliance Expertise in London
Editor’s Pick
Top-ranked in London
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
NCC Group
Global cybersecurity consultancy with CREST, CHECK, and CBEST accreditation, renowned for deep technical research and comprehensive penetration testing services.
SECFORCE
Canary Wharf-based adversary simulation and CBEST-aligned penetration testing consultancy, delivering CREST-accredited offensive security to UK financial services and other organisations with the most demanding requirements.
Nettitude
CREST, CHECK, and CBEST accredited UK consultancy within Lloyd's Register, delivering premium penetration testing for government and critical infrastructure.
PwC Cyber Security
Global Big Four professional services firm delivering CREST, CHECK, and CBEST-accredited penetration testing and red teaming services from London, serving the UK's largest enterprises and regulated organisations.
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.
JUMPSEC
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Mandiant
World-renowned cybersecurity firm now part of Google Cloud, delivering threat intelligence-led penetration testing and red teaming informed by front-line incident response experience.
LRQA
The only organisation worldwide with a full suite of CREST accreditations. 250+ cybersecurity specialists operating in 55+ countries across pen testing, red teaming, and incident response.
Thales Cyber Solutions
Cybersecurity division of the Thales Group, with ANSSI, CREST, FedRAMP 3PAO, and NATO-cleared personnel. Defence, government, and critical infrastructure penetration testing worldwide.
WithSecure
Helsinki-headquartered Finnish cybersecurity firm with roots dating to 1988, offering CREST-accredited penetration testing and deep expertise in EU regulatory compliance including GDPR, NIS 2, and TIBER-EU.
Penetration Testing in London, FAQs
How do I find a penetration testing provider in London?+
We currently list 29 penetration testing providers serving London. You can filter by service type, accreditation, compliance expertise, and pricing to find the best fit for your requirements. Each provider profile includes verified accreditations, service details, and independent scores based on our transparent methodology.
What accreditations should I look for in London?+
Of the 29 providers listed for London, 19 hold CREST accreditation, the most widely recognised standard for penetration testing quality in the Europe region. For European organisations, look for providers with ISO 27001 certification and expertise in GDPR, NIS 2, and DORA compliance.
How much does penetration testing cost in London?+
Penetration testing costs in London vary significantly based on scope and complexity. A standard web application test typically ranges from $5,000 to $25,000, network penetration tests from $10,000 to $30,000, and comprehensive red team engagements from $30,000 to over $100,000. Key cost factors include the number of targets, required accreditations, testing methodology, and whether on-site presence is needed. See our general pricing guide for more detail.