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Top 5 Pen Testing Companies in the UK

Sanjiv Cherian

Sanjiv Cherian, Cyber Security Director
May 01, 2023

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Top 5 Pen Testing Companies in the UK

Companies in the UK must choose the right pen testing company to guarantee protection against vulnerabilities and help reduce the risk of future attacks.

But, of course, choosing the best pen tester in the UK requires due diligence. You must ensure the pen testing service provider has the expertise and experience and delivers the service at a competitive rate.

While vetting different companies on your own can be a good start, it is laborious and time-consuming because there are many pen testers to choose from. This article lists the five best pen testing companies in the UK to help you get started fast.

Are you looking for a certified cybersecurity company in the UK? Microminder is a UK-based security company that can help boost your security posture and protect against vulnerabilities. We provide penetration testing services for businesses of all sizes.

Talk to our experts today

What Is Penetration Testing?

A pen test is done to find and fix vulnerabilities in your network, server and web application before attackers can exploit them. Companies doing penetration testing will carry out an authorised simulated attack to evaluate the security of your entire system, identify vulnerabilities and provide ways to remediate them.

Types of Pen Testing

Different types of penetration testing exist; they are:

Network Pen Test

A network pen test finds vulnerabilities in your company's network by intentionally using different malicious techniques to evaluate its security. Network penetration testing is divided into:

  1. External network pen test.This involves testing the security of your organisation's firewall and intrusion detection systems. The tester will attempt to access the network outside your company's boundaries.

  2. Internal network pen test.This test evaluates the security of your company's internal network. The tester will simulate an attack from within your company and attempt to gain unauthorised access to sensitive data.
Web Application Pen Testing

A web app pen test focuses on simulating attacks on websites, including the front and back-end, APIs and any third-party integration. These tests aim to identify vulnerabilities that could be exploited by attackers who try to gain unauthorised access to your web application or sensitive data.

API Penetration Testing

An API pen test is a security assessment carried out by professionals to determine if an API is susceptible to vulnerabilities, including:

  1. Bypass of access controls
  2. SQL injection
  3. Sensitive information disclosure
  4. Broken authentication
  5. Mass assignment
Mobile App Pen Test

Mobile app penetration testing is done to detect loopholes in your app security before attackers exploit them. The tester will test for vulnerabilities like:

  1. Untrusted inputs
  2. Insecure data storage
  3. Insecure communication
  4. Insufficient cryptography
  5. Code obfuscation

Top 5 UK Pen Testing Companies

Microminder Cybersecurity

1. Microminder

Microminder is a cybersecurity firm headquartered in London, United Kingdom. We have offices in other parts of the world, including Dubai, the Netherlands, Ireland and South Africa.

As a top-rated security company, our pen testing covers a wide range of technology from network systems to servers, web and mobile applications and APIs. Industries we cover include finance, legal, healthcare, energy and more.

Our penetration testing services include:

  • Infrastructure testing. We offer white, black and grey box testing for internal and external APIs and IPs
  • Web and mobile application testing. We help secure your mobile and web applications with comprehensive vulnerability tests to identify weaknesses.
    For web apps, we test for vulnerabilities in line with OWASP Top 10 while we test iOS and Android platforms to keep your digital assets secure.
  • Red teaming and cloud security assessment. Our experts simulate real-life attacks to test your business resilience against cyber threats. Also, we help you uncover any insecure configurations in your cloud infrastructure.
  • Detailed scan to protect your assets. We perform automated and manual scans on your network, web apps, server and APIs and give you a report with remediation advice.
  • Firewall testing. We test your internal and external network for any sign of vulnerability.

2. Redscan

Redscan is a security company that provides detection and response assessment services for businesses in different industries, including finance, retail, legal, transport, healthcare and energy. As one of the best pen testing companies in the UK, they will help you identify vulnerabilities that can affect the security integrity of your systems.

Such vulnerabilities include insecure configuration, flaws in encryption, programming weaknesses and session management flaws.

Its experts stay on top of any attack by understanding how attackers work and using the latest security tools to detect and prevent cyber threats continuously.

Redscan pen testing services include:

  • Network infrastructure testing
  • Web application testing
  • Cloud penetration testing
  • Wireless testing
  • Mobile security testing
  • Social engineering

And after the pen test, they will give you a post-assessment report that outlines the following:

  • A detailed report of all risks identified
  • The business impact of each risk
  • Insight into ease of vulnerability exploitation
  • Actionable remediation guidance
  • Strategic security recommendations

3. Intruder

Intruder was founded in 2015 to help organisations reduce exposure to cyber attacks by providing effortless cyber security management services.

They help businesses in different industries monitor their stacks and provide greater coverage with leading expertise.

Its pen testing services automatically scan your digital assets (servers, cloud systems, websites) for threats and vulnerabilities such as encryption weaknesses, missing patches, misconfigurations, SQL injection and OWASP Top 10.

Some benefits Intruder offers its clients are reduced time to fix vulnerabilities, accurate and in-context reports and continuous peace of mind.

Astra Security

4. Astra Security

Astra Security is a cybersecurity company with two unique products – Astra Website Protection and Astra Pentest Platform.

With Astra Security, you can test for over 3000 vulnerabilities, including SANS and OWASP tests.

Astra Security uses manual and automated tools to provide in-depth penetration testing that uncovers vulnerabilities. Its range of pentesting includes:

  • Vulnerability Assessment and Penetration Testing (VAPT)
  • Payment manipulation testing
  • Server infrastructure testing & DevOps
  • Business logic testing
  • Test for known CVEs

5. Blaze

Blaze is a pen testing firm founded by Andrew Rose and Will Dormann, former UK National Cyber Security Centre members. The firm has a squad of pen testers that are CREST certified and have experience working with large organisations. Blaze offers four types of pen tests, including:

  • Network penetration testing. Its experts will try to identify vulnerabilities within your network infrastructure, such as switches, routers and firewalls.

  • Web application pentest. Blaze experts will try to exploit vulnerabilities, including directory traversal attacks, SQL injection and cross-site scripting in your web apps.

  • Wireless pentest. Its professionals will attempt to find vulnerabilities such as WEP and WPA in your wireless networks.

  • Physical pentest. In this test, Blaze experts will try to gain access to your building by trying to bypass your installed security systems such as CCTV and alarm.


Pen testing is important for your business if you want to safeguard your data, stay compliant and build customers' trust. While there are different pentest companies to choose from, their range of services varies. That is why you must vet each pen test firm to select the best.

Of course, vetting can be time-consuming, especially for busy businesses with little time. In that case, why not let Microminder protect your web and mobile application, servers and APIs from threats? Talk to an expert today, and let's transform your cybersecurity strategy.

Don’t Let Cyber Attacks Ruin Your Business

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  • 40 years of experience: We have served 2500+ customers across 20 countries to secure 7M+ users
  • One Stop Security Shop: You name the service, we’ve got it — a comprehensive suite of security solutions designed to keep your organization safe

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