Top 100 Penetration Testing Companies in London
The Best of December 2025Looking for a top penetration testing company in London?
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 London. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best London Penetration Testing Services
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91Undisclosed10 - 49 employeesCity of London, EnglandStack Digital is a small cloud consulting & SI company. The City of London, England-based company was founded in 2020. Their team focuses on cloud consulting & SI, BI & big data consulting & SI, cybersecurity, IT managed services, and more.Read More
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92Undisclosed2 - 9 employeesRomford, EnglandIT Department is a Romford, England-based IT strategy consulting company. Their services include IT strategy consulting and unified communications consulting & SI.Read More
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93Undisclosed2 - 9 employeesCity of London, EnglandEstablished in 2013, Cyber Sentinel is a Cybersecurity company. The agency specializes in Cybersecurity, and is small.Read More
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94Undisclosed2 - 9 employeesLondon, EnglandMesoform Limited is an IT strategy consulting company headquartered in London, England. They focus on IT strategy consulting and cloud consulting & SI and were launched in 2016.Read More
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95Undisclosed2 - 9 employeesCity of London, EnglandCybersecurity company Defensity was launched in 2019. The team specializes in Cybersecurity and IT strategy consulting.Read More
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96Undisclosed10 - 49 employeesCity of London, EnglandAppsecco is a Cybersecurity company launched in 2015. The company provides Cybersecurity.Read More
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97Undisclosed2 - 9 employeesLondon, EnglandLocated in London, England, TestPro Consulting Ltd is a small Cybersecurity company. Their services include Cybersecurity and Artificial Intelligence.Read More
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98Undisclosed50 - 249 employeesFarnborough, EnglandRead More
Midsize Cybersecurity company Foresite Cybersecurity, is located in Overland Park, Kansas and Farnborough, England. Established in 2013, the team provides Cybersecurity, Compliance Consulting, cloud consulting & SI, and IT managed services.
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99Undisclosed2 - 9 employeesLondon, EnglandKiktronik Limited is a small London, England-based Cybersecurity company. Their services include Cybersecurity and IT managed services.Read More
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100Undisclosed10 - 49 employeesBerkhamsted, EnglandHeadquartered in Berkhamsted, England, Memgraph is a software development company. Founded in 2016, the team provides Custom Software Development and Cybersecurity.Read More
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101$5,000+10 - 49 employeesStevenage, EnglandIT managed services company Primenet was launched in 1998. The firm focuses on IT managed services and Cybersecurity.Read More
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102$10,000+2 - 9 employeesWelwyn, EnglandColibri Digital, an artificial intelligence firm, was launched in 2015. The agency specializes in Artificial Intelligence and BI & big data consulting & SI, and is small.Read More
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103$1,000+Freelancer employeesIstead Rise, EnglandHelpFully IT is an Istead Rise, England-based IT strategy consulting company. They offer IT strategy consulting and cloud consulting & SI.Read More
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104$50,000+1,000 - 9,999 employeesUtrecht, NetherlandsRead 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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105$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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106$10,000+10 - 49 employeeskent, EnglandSmall IT managed services company Allteks LTD, is located in kent, England. Their services include IT managed services and IT strategy consulting.Read More
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107$1,000+10 - 49 employeesBishop's Stortford, EnglandGenmar (UK) Ltd is an IT managed services company. Established in 1996, the team offers IT managed services and cloud consulting & SI.Read More
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108$1,000+10 - 49 employeesPitstone, EnglandCloudandmore, a Cybersecurity company, was founded in 2021. The team focuses on Cybersecurity and IT strategy consulting and is based in Pitstone, England and Bristol, England.Read More
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109$10,000+50 - 249 employeesMeppershall, EnglandCentrality is a Cybersecurity company. Headquartered in Meppershall, England, the firm specializes in Cybersecurity and IT strategy consulting.Read More
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110$5,000+2 - 9 employeesLetchworth, EnglandIT managed services company Edge IT was founded in 2012. The team provides IT managed services and Cybersecurity and is located in Letchworth, England.Read More
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111Undisclosed2 - 9 employeesHorsham, EnglandCybersecurity company PocketSIEM is located in Horsham, England. They specialize in Cybersecurity and were established in 2019.Read More
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112Undisclosed50 - 249 employeesAylesbury, EnglandRed Helix is a Cybersecurity company. The firm is in Aylesbury, England. Their services include Cybersecurity and IT managed services.Read More
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113$5,000+2 - 9 employeesOldbrook, EnglandGEOPC Ltd is an Oldbrook, England-based Cybersecurity company. Founded in 2023, the team provides Cybersecurity.Read More
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114Undisclosed10 - 49 employeesOxford, EnglandFounded in 1996, Wiseserve Ltd. Is a Cybersecurity company. Their team provides Cybersecurity and IT managed services.Read More
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115$1,000+Freelancer employeesBiddenham, EnglandPeter Groom is an IT strategy consulting company. Their team is located in Biddenham, England. The company provides IT strategy consulting and Business Consulting.Read More
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116$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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117Undisclosed250 - 999 employeesCroxley Green, EnglandLaunched in 2001, GCI is a data analytics company. The team offers BI & big data consulting & SI and cloud consulting & SI and is in Lincoln, England and Calder Grove, England.Read More
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118$5,000+2 - 9 employeesChalfont Saint Peter, EnglandBAT CODERS is a Cybersecurity company. Launched in 2011, the team offers Cybersecurity and Mobile App Development. The agency is based in Chalfont Saint Peter, England.Read More
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119Undisclosed10 - 49 employeesLondon, EnglandJUMPSEC Ltd is a Cybersecurity company founded in 2012. Their team specializes in Cybersecurity.Read More
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120Undisclosed250 - 999 employeesLondon, EnglandExiger is an AI company. They offer Artificial Intelligence and Cybersecurity and were launched in 2013.Read More
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