Top 100 Penetration Testing Companies in the United Kingdom
The Best of December 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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31$1,000+2 - 9 employeesLondon, EnglandHeadquartered in London, England, Cynance is a Cybersecurity company. Established in 2019, the team specializes in Cybersecurity.Read More
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32Undisclosed10 - 49 employeesBelfast, Northern IrelandSmall Cybersecurity and IT managed services company Nimbus, is located in Belfast, Northern Ireland. Their services include Cybersecurity and IT managed services.Read More
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33$25,000+1,000 - 9,999 employeesLondon, EnglandNetsol Technologies Inc. Is a Cybersecurity company. Based in Los Angeles, California and London, England, the team specializes in Cybersecurity and cloud consulting & SI.Read More
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34Undisclosed250 - 999 employeesManchester, EnglandInKnowTech is an IT managed services company. The team is based in Bengaluru, India and Bengaluru, India, and their services include IT managed services and cloud consulting & SI.Read More
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35$1,000+50 - 249 employeesLondon, EnglandMidsize Cybersecurity company Clear Infosec, is based in Jersey City, New Jersey and Toronto, Canada. The team focuses on Cybersecurity and IT strategy consulting.Read More
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36$5,000+10 - 49 employeesLondon, EnglandCovertSwarm is a Cybersecurity company. Based in London, England and Wilmington, Delaware, their team offers Cybersecurity.Read More
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37Undisclosed250 - 999 employeesNottingham, EnglandLittlefish Managed IT Services is an IT managed services company. Their midsize team is located in Nottingham, United Kingdom; Sheffield, United Kingdom and London, United Kingdom. The firm specializes in IT managed services, cybersecurity, cloud consulting & SI, and IT strategy consulting. The firm was established in 2003.Read More
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38$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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39Undisclosed250 - 999 employeesLake Oswego, ORFounded in 1986, Online Business Systems is a Cybersecurity company. The team specializes in Cybersecurity and IT strategy consulting.Read More
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40Undisclosed2 - 9 employeesNottingham, EnglandCybersecurity company Collective Security is based in Nottingham, England. Their services include Cybersecurity and other IT consulting and SI.Read More
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41$10,000+50 - 249 employeesWallsend, EnglandForfusion is a midsize Wallsend, England-based IT managed services company. Their services include IT managed services and IT strategy consulting.Read More
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42$10,000+50 - 249 employeesStanmore, EnglandMicromindercs is a Cybersecurity company. Launched in 2018, the team focuses on Cybersecurity and IT managed services.Read More
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43Undisclosed10 - 49 employeesLondon, EnglandLaunched in 2017, Hazy is a small big data company. Their services include BI & big data consulting & SI and Artificial Intelligence.Read More
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44$5,000+10 - 49 employeesLondon, EnglandLineal is a small Business Consulting company based in London, England and Hong Kong, Hong Kong. Their services include Business Consulting and Cybersecurity.Read More
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45Undisclosed250 - 999 employeesLincoln, 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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46$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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47$1,000+10 - 49 employeesAdderbury, EnglandST Engineering Antycip, a custom software development firm, provides Custom Software Development and AR/VR development. The firm is headquartered in Argenteuil, France and Saronno, Italy.Read More
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48$1,000+10 - 49 employeesStourbridge, EnglandSuperfast IT is a Cybersecurity company. In Stourbridge, England, the agency specializes in Cybersecurity and IT managed services.Read More
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49Undisclosed50 - 249 employeesLondon , EnglandPenguin Commercial Limited, a Corporate Travel Management company, is located in London , England. The team focuses on Corporate Travel Management and IT managed services.Read More
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50$1,000+10 - 49 employeesLondon, EnglandSectricity is a Cybersecurity company established in 2021. In Merelbeke-Melle, Belgium and London, England, the team specializes in Cybersecurity.Read More
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51$5,000+2 - 9 employeesBelfast, Northern IrelandFounded in 2006, Vertical Structure is a cloud consulting & SI company. The team specializes in cloud consulting & SI and Cybersecurity.Read More
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52Undisclosed250 - 999 employeesLondon, EnglandRedscan is a Cybersecurity company founded in 2015. Their team offers Cybersecurity.Read More
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53Undisclosed10 - 49 employeesWhitchurch, EnglandInfosec Partners is a Whitchurch, England-based Cybersecurity company. Their services include Cybersecurity.Read More
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54Undisclosed10 - 49 employeesDoogary, Northern IrelandLoughTec IT · Cyber Security, a Cybersecurity company, focuses on Cybersecurity and IT managed services. The agency is in Doogary, Northern Ireland.Read More
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55Undisclosed2 - 9 employeesSunderland, EnglandLaunched in 2018, CyberWhite Limited is a Cybersecurity company. The agency offers Cybersecurity and IT managed services.Read More
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56$1,000+50 - 249 employeesWarrington, EnglandCloudCoCo Plc is a midsize Warrington, England-based IT managed services company. The team specializes in IT managed services and Cybersecurity.Read More
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57Undisclosed250 - 999 employeesRoyal Leamington Spa, EnglandLRQA Nettitude is a Cybersecurity company. The New York, New York-based company specializes in Cybersecurity and IT managed services.Read More
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58Undisclosed2 - 9 employeesCity of London, EnglandCyPro, a Cybersecurity company, was established in 2021. Headquartered in City of London, England, the team focuses on Cybersecurity.Read More
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59Undisclosed2 - 9 employeesLondon, EnglandHookPhish is a Cybersecurity company. They are in London, England, and their services include Cybersecurity.Read More
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60$1,000+10 - 49 employeesEdinburgh, ScotlandTrace is a Business Consulting company. They are located in Edinburgh, Scotland and New York, New York, and their services include Business Consulting and Corporate Training & Coaching.Read More
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