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.
UK offensive security consultancy delivering CREST-accredited penetration testing, adversary simulation and CBEST, TIBER-EU and TBEST threat-led testing, mainly for financial services and other large organisations.
Cybersecurity consulting division of global insurance leader Aon, uniquely combining penetration testing with cyber risk quantification and insurance expertise.
CREST and CHECK-accredited European managed services provider delivering penetration testing with deep infrastructure and cloud hosting expertise.
Subscription-based offensive cybersecurity firm delivering continuous cyber attack services with CREST STAR and CBEST accreditations from its London headquarters.
Full-service London-based cybersecurity consultancy with CREST, CHECK, and NCSC accreditations delivering offensive testing, managed detection, and strategic advisory services.
Israeli-headquartered global cybersecurity consultancy with a UK presence, specialising in penetration testing and TIBER-EU red team exercises for Fortune 500 companies.
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.
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.
CREST-certified and PCI QSA penetration testing consultancy in London, delivering offensive security and compliance services across 25+ countries with research-driven expertise.
London-based cybersecurity firm offering unlimited, fixed-price penetration testing and red teaming services with ISO 27001 certification and a unique subscription model.
Airbus group cybersecurity consultancy with ANSSI PASSI qualification. Aerospace, defence, and critical infrastructure penetration testing across Europe.
Fast-growing CREST and CHECK-accredited UK cybersecurity consultancy with deep expertise in critical national infrastructure sectors.
We currently list 26 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.
Of the 26 providers listed for London, 16 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.
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.