Top 100 Cybersecurity Companies in London
The Best of May 2026Looking for a top cybersecurity consultant in London?
Check out our list of the best cybersecurity consulting companies to choose a partner that can secure your company. Preventing data breaches should be the top security priority for all businesses in the digital age.
To assist you in your search for a partner, we’ve compiled this list of the top cybersecurity consulting companies in London. Browse descriptions, feedback, and awards to find which can best suit your company’s needs.
List of the Best London Cybersecurity Consultants
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31Undisclosed1,000 - 9,999 employeesLondon, EnglandRead More
ValueLabs is a global business technology services and solutions provider based in Hyderabad, India with over 25 offices worldwide in the US, Europe, and Asia. Founded in 1997, ValueLabs' team of over 5,000 employees provides non-voice BPO/back office services and voice/call center capabilities.
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32$1,000+2 - 9 employeesWembley, EnglandVUPAX Solutions Limited, an user experience design company, was founded in 2025. Their small team is based in Wembley, England. Their services include UX/UI Design, cloud consulting & SI, Cybersecurity, Custom Software Development, and more.Read More
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33Undisclosed1,000 - 9,999 employeesLondon, EnglandRead More
BSI Group is an IT firm headquartered in London. Their midsized team specializes in cybersecurity, IT strategy consulting, and business consulting.
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34$5,000+50 - 249 employeesLondon, EnglandCovertSwarm is a Cybersecurity company based in London, England and Wilmington, Delaware. Founded in 2020, the team provides Cybersecurity.Read More
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35$10,000+10 - 49 employeesLondon, EnglandT3 is an AI Consulting company founded in 2023. The small London, England-based team specializes in AI Consulting, Artificial Intelligence, Generative AI, AI Agents, and more.Read More
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36Undisclosed10 - 49 employeesLondon, EnglandSereno IT Support, a Cybersecurity company, is headquartered in London, England and London, England. Their services include Cybersecurity and IT managed services.Read More
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37Undisclosed250 - 999 employeesLondon, EnglandLittlefish Group is an IT managed services company. Their midsize team is located in Nottingham, England; Sheffield, England and London, England. The company specializes in IT managed services, Cybersecurity, IT strategy consulting, and cloud consulting & SI.Read More
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38$50,000+10 - 49 employeesLondon, EnglandFounded in 2023, Opstergo is a cloud consulting & SI company. The small Zagreb, Croatia-based team specializes in cloud consulting & SI, devops managed services, and cybersecurity.Read More
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39$1,000+50 - 249 employeesLondon, EnglandWQsoftwares, a Marketing Strategy company, was established in 2014. The midsize team provides Marketing Strategy and cloud consulting & SI.Read More
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40$1,000+10 - 49 employeesLondon, EnglandRead More
Altahonos is a digital reputation company based in London with offices in San Francisco and Istanbul. The company, founded in 2017, has a team of more than ten that provides cybersecurity, branding, digital strategy, SEO, and IT strategy consulting services to various clients and companies.
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41$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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42Undisclosed250 - 999 employeesLondon, EnglandFounded in 1986, Online Business Systems is a Cybersecurity company. The team specializes in Cybersecurity and IT strategy consulting.Read More
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43Undisclosed250 - 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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44$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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45Undisclosed50 - 249 employeesLondon, EnglandCyberOne, a Cybersecurity company, was founded in 2005. The company specializes in Cybersecurity and IT managed services, and is midsize.Read More
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46Undisclosed250 - 999 employeesLondon, EnglandIT strategy consulting company Air IT Group was established in 2005. The team provides IT strategy consulting and cloud consulting & SI.Read More
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47$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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48Undisclosed250 - 999 employeesLondon, EnglandRedscan is a Cybersecurity company founded in 2015. Their team offers Cybersecurity.Read More
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49$1,000+2 - 9 employeesLondon, EnglandForensic Control, a Cybersecurity company, was launched in 2008. The team provides Cybersecurity and Litigation Support Services.Read More
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50$250,000+10,000+ employeesLondon, EnglandSpetsnaz Security International Limited is a Business Consulting company. The team is based in London, England, and their services include Business Consulting and Building Security Services.Read More
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51$10,000+10 - 49 employeesLondon , EnglandTurgensec is a small Cybersecurity company headquartered in London , England. Their services include Cybersecurity.Read More
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52$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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53Undisclosed2 - 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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54Undisclosed2 - 9 employeesLondon, EnglandSES Escrow is a Cybersecurity company. The Handforth, England-based agency was founded in 2008. Their services include Cybersecurity.Read More
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55$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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56$10,000+250 - 999 employeesLondon, EnglandExponential-e, a Cybersecurity company, specializes in Cybersecurity and cloud consulting & SI. The firm is based in London, England.Read More
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57Undisclosed2 - 9 employeesLondon, EnglandCybersecurity company Cyber Legion was launched in 2021. Located in London, England, the team offers Cybersecurity and Application Testing.Read More
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58$5,000+10 - 49 employeesLondon, EnglandEstablished in 2021, Kloudwerk is a Cybersecurity company. The small team specializes in Cybersecurity.Read More
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59$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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60$5,000+250 - 999 employeesLondon , EnglandSoitron is a Bratislava 25, Slovakia-based IT managed services company. The team provides IT managed services and IT staff augmentation.Read More
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HPEIndustries
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