Top 100 Cybersecurity Companies in London

Transputec, a midsize cybersecurity company, is located in Wembley, United Kingdom. They focus on cybersecurity, IT managed services, and custom software development and were launched in 1984.

HewardMills is a Data Protection Office (DPO) services company based in London with offices in Dublin, San Francisco, Berlin, and Zurich. The company has a team of more than 30 that provides business consulting, cybersecurity, and corporate training services to various companies.

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.

BSI Group is an IT firm headquartered in London. Their midsized team specializes in cybersecurity, IT strategy consulting, and business consulting. 

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.

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.

Texaport Ltd is a tech support company based in Edinburgh, England, with a team of fewer than 10 members. Founded in 2012, the company provides cybersecurity, IT managed services, and IT strategy consulting services to mid-market firms as well as small and large companies. They have worked in various industries, such as IT, business services, and telecommunications.

Pro4ia is an IT managed services company launched in 2001. Headquartered in New York, New York and London, United Kingdom, their midsize team provides IT managed services, cloud consulting & SI, IT staff augmentation, IT strategy consulting, and more.

Tibus Ltd is an internet company based in Belfast, Ireland that was founded in 1996. Their team of around 30 employees provides managed IT services to mid-market and small businesses in the IT sector. 

ICterra is a midsize software development firm. Located in ANKARA, Turkey; München, Germany; LONDON, United Kingdom and ISTANBUL, Turkey, the company was founded in 1991. Their services include custom software development, application management & support, Artificial Intelligence, IoT development, and 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.

Cloud consulting & SI company Corewide was established in 2015. Their small team is in London, United Kingdom. Their services include cloud consulting & SI, other IT consulting and SI, IT managed services, and cybersecurity.

RiskIQ is a cybersecurity company based in San Francisco with a team of just over 150 employees. Established in 2009, they provide cybersecurity, business intelligence, big data consulting, and software integration services to clients in a variety of industries.

Founded in 2007, Lookout is a cybersecurity company. The firm focuses on cybersecurity and has a midsize team.

Founded in 1998, IOActive is a cybersecurity company. Their midsize team is headquartered in Seattle, Washington; London, United Kingdom; Madrid, Spain and , United Arab Emirates and offers cybersecurity.

Guidance Software is a software development firm that has been in operation since 1997. They are headquartered in Pasadena, Calif. and they have additional offices in Slough, U.K., Courbevoie, France, Waukesha, Wis., Rosemont, Ill., Dulles, Va., and New York. They have over 800 employees and they specialize in cybersecurity, IT strategy consulting, and IT staff augmentation. Their clients generally work in consumer services, government, or healthcare.

Cybereason is a cybersecurity company launched in 2012. Their midsize team is in Boston, Massachusetts; London, United Kingdom and Tel-Aviv, Israel. The agency specializes in cybersecurity, BI & big data consulting & SI, and IT strategy consulting.

Digital Guardian, an IT managed services company, was launched in 2003. Based in Waltham, Massachusetts; Reston, Virginia; Santa Clara, California and Lehi, Utah, their midsize team focuses on IT managed services, cybersecurity, and IT strategy consulting.

Veracode is a cybersecurity company based in Burlington, Massachusetts; London, United Kingdom and Boston, . The firm provides cybersecurity, application testing, and IT strategy consulting and has a midsize team.The firm was founded in 2006.

Digital Shadows, a cybersecurity company, is headquartered in London, United Kingdom and Dallas, Texas. Established in 2011, the midsize team offers cybersecurity.

ERP consulting and SI company Professional Advantage is in North Sydney, Australia. The midsize team offers ERP consulting and SI, cloud consulting & SI, BI & big data consulting & SI, cybersecurity, and more and was established in 1989.

In London, United Kingdom, Ravelin Technology is an AI firm and cybersecurity company. The midsize firm was established in 2014. Their team specializes in Artificial Intelligence and cybersecurity.

Turgensec, a cybersecurity company, is located in London , United Kingdom. They offer cybersecurity and were founded in 2019.

Digitpol, an IT managed services company, was established in 2013. The firm offers IT managed services, cybersecurity, accounting, e-commerce development, and more and has a large team. The firm is based in Apeldoorn, Netherlands; Hong Kong, Hong Kong and London, United Kingdom.

Vuntie Limited, a cybersecurity company, was founded in 2019. Based in London, United Kingdom, their small team focuses on cybersecurity, custom software development, BI & big data consulting & SI, IoT development, and more.

Nicolson Bray Ltd is a cybersecurity company. Located in London, United Kingdom, their small team provides cybersecurity. The company was founded in 2012.

Emagine Consulting is a big data analytics company. Founded in 1994, the large company is in London, United Kingdom; Nanterre, France and Berlin, Germany. Their team focuses on BI & big data consulting & SI, cybersecurity, and mobile app development.

HEXENS is a London, United Kingdom-based cybersecurity company. The small company was established in 2021. Their team focuses on cybersecurity.

Clear Infosec is a Jersey City, New Jersey-based cybersecurity company. They specialize in cybersecurity, IT staff augmentation, and IT strategy consulting and were established in 2017.

Small cybersecurity and business consulting company Acumin Consulting, is in London, . Established in 1998, the team specializes in cybersecurity and business consulting.