Top 100 Penetration Testing Companies in the United Kingdom
The Best of January 2025Looking for a top penetration testing company in the United Kingdom?
Having vulnerable security poses a threat to your organization. In an age where data has become some of the most important assets that your company will have, improving security measures is always a must. Penetration testing aims to solve this problem by simulating real-life security breaches without the risk of an actual cyberattack. Also known as ethical hacking, this process helps identify weak spots within your IT network infrastructure by applying methods that real attackers would use.
A penetration testing company can assist you in determining your security vulnerabilities. Doing so will provide you with the information that you need to fortify your cybersecurity. Hiring the right penetration testing company can give you a significant advantage in safekeeping your virtual assets.
To assist you in your search for a partner, we’ve compiled this list of the top penetration testing services in United Kingdom. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best United Kingdom Penetration Testing Services
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1
Undisclosed50 - 249 employeesFarnborough, EnglandForesite Cybersecurity, a Cybersecurity company, was founded in 2013. They are in Overland Park, Kansas and Farnborough, England and have a midsize team. Their services include Cybersecurity, Compliance Consulting, cloud consulting & SI, and IT managed services.Read More
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2
$1,000+10 - 49 employeesHildenborough, EnglandRead More
RSK Cyber Security is a cybersecurity company. They are headquartered in Hildenborough, United Kingdom and Dubai, United Arab Emirates and have a small team. Their services include cybersecurity, cloud consulting & SI, web development, mobile app development, and more. The company was established in 2021.
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3
$5,000+1,000 - 9,999 employeesLondon, EnglandRead More
ERRNA is a blockchain company founded in 2015. The small San Jose, California-based team provides blockchain, cybersecurity, marketing strategy, mobile app development, and more.
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4
$5,000+50 - 249 employeesLondon, EnglandLocated in London, England and Düsseldorf, Germany, Transputec Ltd is a Cybersecurity company. The midsize agency was launched in 1986. Their services include Cybersecurity, IT managed services, Artificial Intelligence, cloud consulting & SI, and more.Read More
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5
$10,000+250 - 999 employeesLondon, EnglandRead More
A1QA logo is a quality assurance and software testing company founded in 2002. Based in Denver, they have a team of 200+ employees that specialize in application testing and cybersecurity. They primarily serve midmarket clients in the IT and telecommunications industries.
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AdidasIndustries
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6
$10,000+250 - 999 employeesLondon, EnglandRead More
Link Group Global, inc. Is an Austin, Texas-based human resources agency. The midsize company was established in 2015. Their services include HR services, IT managed services, and IT staff augmentation.
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DanoneIndustries
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7
$5,000+10 - 49 employeesEdinburgh, ScotlandRead More
Texaport is an established and reputable managed service provider with a strong focus on security and customer service excellence. Texaport empowers organizations with comprehensive managed services that combine exceptional customer service, strategic digital transformation, and robust security solutions.
Founded in 2012, Texaport has been providing IT solutions, Consultancy, and Cybersecurity to clients throughout the UK and across the globe.
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8
Undisclosed50 - 249 employeesLondon, EnglandRead More
Founded in 2019, BreachLock Inc is a cybersecurity company. They are in New York, New York and have a midsize team. Their services include cybersecurity, IoT development, application testing, compliance consulting, and more.
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9
Undisclosed50 - 249 employeesLondon, EnglandRead More
Sagiton is a business-oriented software house located in Wroclaw, Poland. The company was founded in 2010 and now employs a team of 48 people. Sagiton provides custom software development, cybersecurity, mobile app development, IT strategy consulting, marketing strategy, and web design services. Most of their clients are small businesses.
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TapWinWinIndustries
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10
$1,000+10 - 49 employeesLondon, EnglandRead More
Quema OÜ is a small IT strategy consulting and cloud consulting & SI company. The Tallinn, Estonia-based company was founded in 2022. Their team offers IT strategy consulting and cloud consulting & SI.
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BlypIndustries
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11
$1,000+10 - 49 employeesLondon, EnglandRead More
Smartdesc is a London-based IT company with a team of fewer than 50 people. Founded in 2011, they offer IT strategy consulting, cloud consulting, and cybersecurity solutions for small and mid-market businesses, primarily non-profit organizations.
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MindIndustries
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12
$1,000+10 - 49 employeesColden Common, EnglandRead More
Evalian is a small cybersecurity and business consulting company. Based in Colden Common, United Kingdom; London, United Kingdom and Worcester, United Kingdom, the firm was founded in 2017. Their team specializes in cybersecurity and business consulting.
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AlliantsIndustries
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13
$1,000+10 - 49 employeesBournemouth, EnglandRead More
Cloudserve is a cloud solutions provider based in Bournemouth, England with an office in London. Founded in 2009, their team of fewer than 50 professionals offers IT managed services, IT strategy consulting, and cloud consulting & SI services for small and medium-sized businesses. They have experience working in various industries, including hospitality, financial services, and IT.
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FJB HotelsIndustries
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14
$25,000+2 - 9 employeesFinchampstead, EnglandRead More
Melmac Solutions Limited is a cybersecurity company. Launched in 1995, the small agency is located in Finchampstead, United Kingdom. Their services include cybersecurity, blockchain, and financial advising & planning.
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15
$5,000+10 - 49 employeesClayton-le-Woods, EnglandRead More
Launched in 2001, HW Technology is an IT managed services company. The agency specializes in IT managed services, cybersecurity, IT strategy consulting, and other IT consulting and SI and has a small team.
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16
$1,000+10 - 49 employeesPotters Bar, EnglandRead More
IT managed services company TWC IT Solutions was established in 2011. They are located in Potters Bar, United Kingdom; Jersey City, New Jersey and Central, Hong Kong and have a small team. Their services include IT managed services, IT strategy consulting, cloud consulting & SI, unified communications consulting & SI, and more.
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17
$5,000+10 - 49 employeesBillericay, EnglandRead More
Clear Thinking Solutions is a communication and IT solutions provider based in Essex, U.K., with an office in London. The company, founded in 2009, has a team of more than 20 that provides IT managed services, cybersecurity, and IT strategy consulting to small and midmarket companies.
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18
$50,000+1,000 - 9,999 employeesAntrim, North Ireland, Northern IrelandRead More
IT strategy consulting and other IT consulting and SI company Black Box is headquartered in. The company provides IT strategy consulting and other IT consulting and SI and is large.The company was established in 1976.
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19
$1,000+10 - 49 employeesLondon, EnglandRead More
SonicFast is a hosting solutions provider founded in 2015 in London and with about 5 employees on board. Their main services include cybersecurity, cloud consulting and systems integration, IT managed services, and business intelligence. They mostly cater to small businesses in telecommunications, IT, and gaming industries.
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20
$25,000+10 - 49 employeesLondon, EnglandHEXENS is a London, United Kingdom-based cybersecurity company. The small company was established in 2021. Their team focuses on cybersecurity.Read More
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21
$5,000+10 - 49 employeesBracknell, EnglandRead More
Deployflow is a boutique DevOps agency composed of a team of fewer than 10 professionals founded in 2010. Based in Reading, the United Kingdom, they provide cloud consulting & SI, cybersecurity, and IT managed services solutions for small and medium-sized businesses in various fields, such as financial services, IT, and real estate.
Clients
TCNIndustries
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22
$1,000+10 - 49 employeesLondon, EnglandRead More
Teceze Ltd is a London-based IT company founded in 2012 with more than 10 employees. They are experts in IT strategy consulting, cybersecurity, and IT managed services for clients that work in the industries of business services, consumer products, and more.
Clients
Outsell, Inc.Industries
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23
$25,000+10,000+ employeesLyne, EnglandRead More
Persistent Systems is a software development firm based in Pune, India. Founded in 1990, their team of over 12,000 employees provides custom software development, CRM consulting, and IT strategy services.
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24
$10,000+10 - 49 employeesLeeds, EnglandRead More
Founded in 2010, NewRedo Ltd. is a software development company headquartered in Leeds, England. Their team of under 10 serves businesses of all sizes in industries such as healthcare, financial services, and government. Services include custom software development, IT managed services, and mobile app development.
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RaceBestIndustries
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25
$250,000+2 - 9 employeesLondon, EnglandSanRa is a Cybersecurity company established in 2022. The small team specializes in Cybersecurity.Read More
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26
$1,000+10 - 49 employeesLondon, EnglandCyberSRC Consultancy LLP is a Cybersecurity company. The team provides Cybersecurity and Application Testing and is headquartered in Noida, India and London, England.Read More
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27
Undisclosed250 - 999 employeesLondon, EnglandProfessional Advantage is a midsize ERP consulting and SI company in North Sydney, Australia and Melbourne, Australia. Their services include ERP consulting and SI and cloud consulting & SI.Read More
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28
$5,000+10 - 49 employeesLondon, EnglandCybersecurity company MIK LIONS Security was launched in 2015. In London, England, the team specializes in Cybersecurity.Read More
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29
Undisclosed2 - 9 employeesMiddlesbrough, EnglandSencode Cyber SEcurity, a Cybersecurity company, was established in 2019. The team specializes in Cybersecurity.Read More
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30
$5,000+2 - 9 employeesOldbrook, EnglandGEOPC Ltd is an Oldbrook, England-based Cybersecurity company. Founded in 2023, the team provides Cybersecurity.Read More
Industries
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