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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61$1,000+10 - 49 employeesEdinburgh, ScotlandIT managed services company Dunedin IT is based in Edinburgh, Scotland and Glasgow, Scotland. The team provides IT managed services and IT strategy consulting.Read More
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62$5,000+10 - 49 employeesTwigworth, EnglandOptimising IT is an IT managed services company. Their small team of employees is headquartered in Twigworth, England. Their team focuses on IT managed services and IT strategy consulting.Read More
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63Undisclosed2 - 9 employeesLondon, EnglandRockSec Group, a small Cybersecurity company, is located in London, England. Their services include Cybersecurity and cloud consulting & SI.Read More
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64$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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65$5,000+10 - 49 employeesLondon, EnglandEstablished in 2020, Securityium is a Cybersecurity company. The team offers Cybersecurity and IT strategy consulting.Read More
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66$5,000+50 - 249 employeesLondon, EnglandCybersecurity company Cybernoq LTD is headquartered in London, England. Their services include Cybersecurity and IT managed services.Read More
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67$1,000+10 - 49 employeesBeckenham, EnglandGregory Micallef Associates is an IT managed services company. They offer IT managed services and Call Center Services and were launched in 1992.Read More
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68Undisclosed10 - 49 employeesLondon, EnglandGoAllSecure is a Cybersecurity company launched in 2022. The firm provides Cybersecurity and cloud consulting & SI.Read More
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69$5,000+10 - 49 employeesLeatherhead, EnglandComputer Care is a small Leatherhead, England-based IT strategy consulting company. Their services include IT strategy consulting and cloud consulting & SI.Read More
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70$1,000+2 - 9 employeesGreenfield, EnglandBased in Greenfield, England, KEEP Information Security Services is a Cybersecurity company. They provide Cybersecurity and IT strategy consulting and were launched in 2014.Read More
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71$50,000+50 - 249 employeesLondon, EnglandVast Dreams, a custom software development company, was established in 2020. They provides Custom Software Development and Enterprise App Modernization.Read More
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72$5,000+2 - 9 employeesJarrow, EnglandVanguard Cyber Security Ltd is a small Cybersecurity company headquartered in Jarrow, England. The team focuses on Cybersecurity.Read More
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73Undisclosed10 - 49 employeesCity of London, EnglandLaunched in 2004, Cubit Technology is a small City of London, England-based IT strategy consulting company. Their services include IT strategy consulting and cloud consulting & SI.Read More
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74$5,000+10 - 49 employeesWesthill, ScotlandG5 Technologies Ltd is a Cybersecurity company. The Westhill, Scotland-based agency specializes in Cybersecurity and IT managed services.Read More
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75$1,000+2 - 9 employeesRomford, EnglandQloud IT Support is a Cybersecurity company established in 2020. The team provides Cybersecurity and IT strategy consulting.Read More
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76$1,000+2 - 9 employeesLondon, EnglandPxosys Ltd is a Cybersecurity company. The London, England-based firm focuses on Cybersecurity and cloud consulting & SI.Read More
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77Undisclosed50 - 249 employeesStaines-upon-Thames, EnglandTDM Group is an IT managed services company. The Staines-upon-Thames, England-based agency was launched in 1997. Their team provides IT managed services and Cybersecurity.Read More
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78Undisclosed250 - 999 employeesBelfast, Northern IrelandSilverSky is a Cybersecurity company. They are headquartered in Morrisville, North Carolina and Milford, Connecticut. Their team offers Cybersecurity.Read More
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79Undisclosed1,000 - 9,999 employeesLondon, EnglandEstablished in 1999, Secureworks is a large Atlanta, Georgia-based Cybersecurity company. Their services include Cybersecurity.Read More
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80Undisclosed50 - 249 employeesEly, EnglandGRC Solutions is an IT strategy consulting company headquartered in Ely, England. They specialize in IT strategy consulting and Cybersecurity.Read More
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81$1,000+50 - 249 employeesGloucester, EnglandCloud9 Data Solutions is a Cybersecurity company. Launched in 2018, the company specializes in Cybersecurity and Compliance Consulting.Read More
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SonyIndustries
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82Undisclosed50 - 249 employeesManchester, EnglandEmergeCyber, a Cybersecurity company, is located in Manchester, England. They offer Cybersecurity and were launched in 2015.Read More
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83Undisclosed2 - 9 employeesManchester, EnglandCybersecurity company RM Information Security specializes in Cybersecurity. They were launched in 2015.Read More
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84$1,000+50 - 249 employeesHandforth, EnglandFrontline Consultancy, an ERP consulting and SI company, was launched in 1991. Headquartered in Handforth, England, the team provides ERP consulting and SI and IT managed services.Read More
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85Undisclosed2 - 9 employeesBangor, Northern IrelandFounded in 2024, INNOSEC is a small IT strategy consulting company. Their team offers IT strategy consulting and cloud consulting & SI.Read More
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86$10,000+2 - 9 employeesLiverpool, EnglandHalcyon IT Services ltd is a Cybersecurity company founded in 2023. In Liverpool, England, the team provides Cybersecurity and IT managed services.Read More
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87Undisclosed50 - 249 employeesExeter, EnglandNexus Open Systems Ltd is a midsize IT strategy consulting company. They offer IT strategy consulting and cloud consulting & SI and were launched in 1998.Read More
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The Met OfficeIndustries
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88$250,000+50 - 249 employeesShadwell, EnglandSpeedster IT, an IT strategy consulting company, was founded in 2014. The team offers IT strategy consulting and cloud consulting & SI.Read More
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89$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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90$1,000+10 - 49 employeesOxford, EnglandWeb development firm OWA Digital is based in Oxford, England and Fitzrovia, London, England. Their services include Web Development and Mobile App Development.Read More
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