Top 100 Cybersecurity Companies in the United Kingdom

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.

Rapid7 is a cybersecurity company launched in 2000. Their large team is located in Boston, Massachusetts; Manhattan Beach, California; Austin, Texas and Cambridge, Massachusetts. The company offers cybersecurity, IT managed services, and IT strategy consulting.

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.

Sec-1, an IT managed services and cybersecurity company, is based in Birstall, United Kingdom. Launched in 2001, the midsize team focuses on IT managed services and cybersecurity.

Founded in 1982, Clearswift is a cybersecurity company. The company offers cybersecurity and has a midsize team. The company is located in Theale, United Kingdom.

Launched in 2010, Berea is a cybersecurity company. The small Leicester , United Kingdom-based team focuses on cybersecurity.

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.

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

Headquartered in Salford, United Kingdom, Defendza is a cybersecurity company. The small firm was launched in 2016. Their team offers cybersecurity and IT strategy consulting.

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.

Seceon Inc., an AI firm and cybersecurity company, is in Westford, Massachusetts and Bishop’s Stortford, United Kingdom. The midsize team specializes in Artificial Intelligence and cybersecurity. The company was established in 2014.

Armor is a cybersecurity company. Their midsize team is in Richardson, Texas and Slough, United Kingdom. The agency offers cybersecurity.

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.

Online Business Systems is an IT strategy consulting company located in Winnipeg, Canada and Bloomington, Minnesota. The midsize team specializes in IT strategy consulting and business consulting. The firm was established in 1986.

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

Infosec Partners, a cybersecurity company, is in Whitchurch, United Kingdom. Founded in 2004, the small team specializes in cybersecurity.

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

PeoplActive is a cloud consulting & SI company in Anaheim, California. The small company was launched in 2020. Their team focuses on cloud consulting & SI.

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

Launched in 2020, Vanguard Cyber Security Ltd is a cybersecurity company. They are in Jarrow, United Kingdom and have a small team. The agency provides cybersecurity.

Headquartered in Edinburgh, United Kingdom, Blockchain Technology Partners Limited is a small cybersecurity company. Launched in 2018, the team focuses on cybersecurity, IT strategy consulting, and IT managed services.

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

GoAllSecure is a cybersecurity company. The small London, United Kingdom-based agency was founded in 2022. Their team provides cybersecurity.

Constant Edge is a cybersecurity company established in 2018. Based in Plymouth, United Kingdom and Claymont, Delaware, their small team offers cybersecurity.

ADL Consulting Limited is a cybersecurity company. Based in Ibstock, United Kingdom, their small team specializes in cybersecurity, IT managed services, and corporate training. The firm was established in 2006.

Sencode Cyber SEcurity is a cybersecurity company. Their small team is headquartered in Middlesbrough, United Kingdom. Their services include cybersecurity. The agency was launched in 2019.

IronNet Cybersecurity is a cybersecurity company. They are headquartered in McLean, Virginia; Raleigh, North Carolina; London, United Kingdom and Singapore, Singapore and have a midsize team that focuses on cybersecurity and corporate training. The firm was launched in 2014.