Top 100 Penetration Testing Companies in London

ERRNA is a blockchain company founded in 2015. The small San Jose, California-based team provides blockchain, cybersecurity, marketing strategy, mobile app development, and more.

A1QA logo is a quality assurance and software testing company founded in 2002. Based in Denver, they have a team of 200+ employees that specialize in application testing and cybersecurity. They primarily serve midmarket clients in the IT and telecommunications industries.

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.

Texaport is an established and reputable managed service provider with a strong focus on security and customer service excellence. Texaport empowers organizations with comprehensive managed services that combine exceptional customer service, strategic digital transformation, and robust security solutions.

Founded in 2012, Texaport has been providing IT solutions, Consultancy, and Cybersecurity to clients throughout the UK and across the globe.

Link Group Global, inc. Is an Austin, Texas-based human resources agency. The midsize company was established in 2015. Their services include HR services, IT managed services, and IT staff augmentation.

Quema OÜ is a small IT strategy consulting and cloud consulting & SI company. The Tallinn, Estonia-based company was founded in 2022. Their team offers IT strategy consulting and cloud consulting & SI.

Sagiton is a business-oriented software house located in Wroclaw, Poland. The company was founded in 2010 and now employs a team of 48 people. Sagiton provides custom software development, cybersecurity, mobile app development, IT strategy consulting, marketing strategy, and web design services. Most of their clients are small businesses.

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.

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.

Founded in 2019, BreachLock Inc is a cybersecurity company. They are in New York, New York and have a midsize team. Their services include cybersecurity, IoT development, application testing, compliance consulting, and more.

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.

IT managed services company TWC IT Solutions was established in 2011. They are located in Potters Bar, United Kingdom; Jersey City, New Jersey and Central, Hong Kong and have a small team. Their services include IT managed services, IT strategy consulting, cloud consulting & SI, unified communications consulting & SI, and more.

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

Founded in 2020, CovertSwarm is a cybersecurity company. The company focuses on cybersecurity and has a small team.

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.

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.

Based in London, United Kingdom, MIK LIONS is a small cybersecurity company. Established in 2015, the team focuses on cybersecurity.

Secureworks is a large cybersecurity company. They offer cybersecurity and were established in 1999.

Cynance, a cybersecurity company, was founded in 2019. The small team focuses on cybersecurity. The firm is in London, United Kingdom.

Darklabs is a cybersecurity company launched in 2016. The company specializes in cybersecurity and has a small team. The company is based in London, United Kingdom.

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.

IT strategy consulting company Air IT was established in 2005. Their midsize team is located in Sandiacre, United Kingdom. Their services include IT strategy consulting, cloud consulting & SI, cybersecurity, and IT managed services.

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.

Cobwebs Technologies is a cybersecurity company founded in 2015. Their small team is in New York, New York; Singapore, Singapore; Gurugram, India and Frankfurt am Main, Germany. Their services include cybersecurity and Artificial Intelligence.

ThreatSpike Labs, a midsize cybersecurity company, is in London, United Kingdom. Established in 2011, the team specializes in cybersecurity.

Based in London, United Kingdom, Cykube is a cybersecurity and blockchain company. The small firm was established in 2018. Their team provides cybersecurity and blockchain.

ISTARI is a cybersecurity company. They are in City of London, United Kingdom; New York, New York and , Singapore and have a small team. The company offers cybersecurity and IT managed services.

Data analytics company Hazy is headquartered in London, United Kingdom. The small team offers BI & big data consulting & SI, Artificial Intelligence, cybersecurity, and business consulting. The firm was established in 2017.

Featurespace is an AI development company. Launched in 2008, the midsize company is headquartered in Cambridge, United Kingdom and London, United Kingdom. Their services include Artificial Intelligence and cybersecurity.

Cloudscape IT Support London is a IT managed services company. The City of London, United Kingdom-based company was founded in 1985. The midsize team offers IT managed services, IT strategy consulting, and cybersecurity.