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OnSecurity

CREST-accredited, platform-driven penetration testing vendor in Bristol offering AI-augmented testing with rapid self-service booking for over 400 global customers.

Featured in: Best CREST Pen Testing Companies

Founded
2018
Team Size
51-200
Geography
Global
Markets
UK, Europe, Global
Last verified: Apr 2026

Key facts

  • Founded in 2018.
  • Headquartered in Bristol, United Kingdom.
  • Team of 51-200 security professionals.
  • Holds CREST and Cyber Essentials accreditation.
  • Delivers 8 penetration testing services.
  • Operates globally, with delivery across the UK and Europe.
  • Specialises in Payment Security, Financial Services Security, and Continuous Testing.
  • Compliance expertise across ISO 27001, SOC 2, PCI DSS, GDPR, and Cyber Essentials.

About

OnSecurity is a fast-growing CREST-accredited penetration testing vendor founded in 2018 and headquartered in Bristol, England. The company has built a technology-first platform that allows clients to quote, schedule, and book penetration tests in under 60 seconds, combining the speed and efficiency of SaaS-based delivery with the rigour of expert human-led testing. With over 400 customers globally and a team of approximately 50 to 60 employees, OnSecurity has established itself as one of the most innovative and accessible penetration testing providers in the UK market.

Methodologies

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