The independent guide to UK pen testing companies

16 listings
Updated January 2026
Sencode

Sencode

Sencode is a UK-based penetration testing company founded in 2019, offering a range of cybersecurity services including penetration testing, vulnerability assessments, and cyber awareness training. Their team consists of certified …

Aardwolf Security

Aardwolf Security

Aardwolf Security is a leading penetration testing company based in the UK, specializing in comprehensive security assessments to protect businesses from cyber threats. Their services include web application testing, network …

Bulletproof

Bulletproof

Bulletproof is a leading UK penetration testing company with over 7 years of experience, offering a comprehensive range of services including web, mobile, and cloud application testing. Their certified team …

Qualysec

Qualysec

Qualysec is a leading cybersecurity company founded in 2020, specializing in penetration testing and security consulting. Known for its comprehensive approach, it combines automated tools with manual testing to identify …

Aptive

Aptive

Aptive is a UK-based penetration testing company specializing in comprehensive internal and external web and network pen testing services. Their manual testing approach aids organizations in meeting compliance standards like …

2|SEC

2|SEC

2|SEC is a leading UK penetration testing company dedicated to enhancing cybersecurity for businesses. With a focus on identifying vulnerabilities across various digital platforms, they offer comprehensive testing services including …

Pentiq

Pentiq

Pentiq is a UK-based cyber security consultancy specializing in penetration testing services for various industries. Their CREST-certified testers provide real-time risk analysis, detailed reports, and proactive solutions to help organizations …

Astra Security

Astra Security

Astra Security is a leading UK penetration testing company based in London, offering a unique blend of automated and manual testing. With over 50 years of combined experience, they conduct …

Pentest Limited

Pentest Limited

Pentest Limited offers comprehensive penetration testing services to help organizations identify vulnerabilities and enhance their cybersecurity posture. Their CREST accredited team conducts tailored assessments across various domains, including infrastructure, web …

Evalian

Evalian

Evalian is a CREST-accredited penetration testing company based in the UK, offering a comprehensive range of services including mobile app, web app, and infrastructure testing. Their expert team provides detailed …

Synack

Synack

Synack is a premier UK-based penetration testing company that offers Penetration Testing as a Service (PTaaS). With a community of over 1,500 skilled security researchers, Synack provides continuous and scalable …

ValueMentor

ValueMentor

ValueMentor is a leading CREST-certified penetration testing company in the UK, specializing in identifying and mitigating security vulnerabilities within IT infrastructures. Their services include various types of penetration testing, providing …

JUMPSEC

JUMPSEC

JUMPSEC is a leading UK-based CREST-accredited penetration testing company, offering a comprehensive range of services including internal and external infrastructure testing, web application assessments, mobile app testing, API security, and …

Cyphere

Cyphere

Cyphere is a leading UK-based penetration testing company, specializing in comprehensive security services across various sectors including eCommerce, Fintech, IT, Healthcare, and Education. With a focus on ethical hacking, they …

What is a Pentesting Company?

A pentesting company specialises in testing the security of computer systems, networks, and applications. They simulate cyberattacks to find vulnerabilities that hackers could exploit. Their goal is to help businesses identify weaknesses and strengthen their defences before a real attack happens. This improves overall security and reduces the risk of breaches.

How Much Does a Pen Test Cost?

The cost of a penetration test (pen test) in the UK typically ranges from £3,000 to £15,000, depending on the scope, size, and complexity of the system being tested. Small businesses or specific applications might pay less, while extensive infrastructure tests for larger companies can cost more.

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