The 100 largest cybersecurity companies in the United Kingdom

BT Groupbt.com

A global communications services company connecting people through technology to address challenges like the pandemic, climate change, and cyber security

BAE Systemsbaesystems.com

The company provides advanced technology-led defense, aerospace, and security solutions, with a skilled workforce in over 40 countries, focusing on innovation and long-term commitment

SCCscc.com

SCC is a leading IT group in Europe, providing limitless IT solutions, cyber security services, digital workplace solutions, and hybrid infrastructure services

Vodafone Businessvodafone.com

Providing mobile, fixed, unified communications, IoT, cloud, and security services to businesses globally, regionally, and locally.

QinetiQqinetiq.com

Integrated global defence and security company focused on mission-led innovation, testing technologies, and enabling customers to deploy enhanced capabilities for protecting lives.

Sophossophos.com

A global cybersecurity leader offering advanced solutions, managed services, and a broad portfolio of technologies to protect organizations from cyberattacks worldwide

Logicalislogicalis.com

A global technology service provider helping organizations succeed in a digital-first world through cloud, connectivity, collaboration, and security solutions

Noventiqnoventiq.com

A global digital transformation and cybersecurity solutions provider connecting 80,000+ organizations, with a diverse portfolio and active M&A strategy for growth

TryHackMetryhackme.com

It simplifies learning and teaching Cybersecurity through prebuilt courses and cloud-hosted virtual machines, ideal for CTFs, workshops, and training.

Micro Focusopentext.com

Provides AI, analytics, application development, modernization, and digital operations technologies to support digital transformation and smarter work processes.

BAE Systems Digital Intelligencebaesystems.com

A global team of over 4,500 experts in digital, cyber, and intelligence, collaborating to collect and analyze complex data for governments and businesses

LRQAlrqa.com

The company provides certification, brand assurance, food safety, cybersecurity, inspection, and training services to help clients build safer, more sustainable businesses

Claranetclaranet.com

A global technology services provider offering managed services, professional services, and training in Cloud, Networks, Cyber Security, and Workplace technologies since 1996

Quantum Security Agencyorg.uk

Specialized restaurant marketing agency offering solutions to help restaurants thrive through social media management, content marketing, websites, and other marketing services

Darktracedarktrace.com

AI cybersecurity platform learns unique data, detects threats, and intervenes against attacks, protecting organizations worldwide from cyber-threats.

NCC Groupnccgroupplc.com

Cybersecurity firm advising global organizations on protecting data and systems, with expertise in assessing, mitigating, and responding to cyber threats Offices worldwide

Gammagammagroup.co

Gamma is a leading supplier of Unified Communications services in the UK, Germany, Spain, and Benelux, offering robust solutions for communication and collaboration

Mimecastmimecast.com

Protects humans, data, and AI agents through a unified platform, securing the workforce and their interactions with AI from cyberattacks.

Hack The Boxhackthebox.com

Leading platform enhancing organizational cyber resilience, battle-testing and upskilling humans and AI agents through real-world scenarios and gamified labs.

Hardwarekubus.com

A hardware company formed in 2003 is now Kubus Group Limited Follow on LinkedIn for company updates, employee information, and career opportunities

MTImti.com

Provides comprehensive cybersecurity and data centre technology solutions, managed services, and consulting to support secure, compliant IT infrastructure management.

Synamediasynamedia.com

A trusted provider of video protection, enrichment, and delivery solutions, offering cloud products for launching, monetizing, and scaling services quickly

GBG Plcgbg.com

Combines global data and innovative technology to verify identities and locations, protecting against digital crime and supporting business growth.

Jiscjisc.ac.uk

National research infrastructure providing high-speed connectivity, cyber security, and technology solutions to UK universities and schools through shared services and digital data tools.

Focus Groupfocusgroup.co.uk

Provides essential business technology, including telecoms, IT, connectivity, mobile, cyber security, and energy solutions for various organizations, ensuring optimized and secure operations.

MASSmass.co.uk

A dynamic technology company within the Cohort plc group, specializing in electronic warfare support, cyber security, IT managed services, and data management

Wavenetwavenet.co.uk

A UK-based company providing unified communications, business telephony, and Cyber Security solutions to help businesses overcome real challenges and achieve brilliance

First Technology UKfirst-technology.co.uk

A group of companies providing IT products and services to help organizations navigate technology challenges and achieve their business outcomes

Cybersecurityorg.uk

Cybersecurity experts providing incident response training, social engineering defense, vulnerability scanning, threat hunting, API testing, mobile app security, privacy compliance, user awareness training, and more

DNSdns.co.uk

A global security services provider recently acquired a UK-based company specializing in managed security services and consulting for clients

Reed Business Informationrisk.lexisnexis.com

Provides innovative data analytics, decision tools, and management services across industries to reduce risk, ensure compliance, and improve operations.

ANS Groupans.co.uk

Providing accessible, affordable enterprise-grade technology and digital transformation solutions to businesses of all sizes, enabling growth and innovation.

Maintelmaintel.co.uk

Provider of cloud communications and managed services, specializing in digital transformation for public and private sectors Delivering digital workplace, customer experience, and secure connectivity solutions globally

Node4node4.co.uk

Node4 specializes in providing a wide range of tech solutions and managed services to help organizations achieve their strategic goals through digital transformation

Rokeroke.co.uk

Engineering advanced data, communication, AI, and sensor technologies for national security, defense, and commercial clients to solve complex challenges.

Dimension Data UKIservices.global.ntt

This company helps organizations achieve their goals through digital infrastructure, hybrid cloud, workspaces, and cybersecurity, empowering businesses to excel and grow with ICT solutions

Bell Integrationbell-integration.com

Provides technology consultation and managed services enabling organizations to transform IT capabilities, enhancing productivity, and cost efficiency. Specializes in IT services and infrastructure.

Bytes Software Servicesbytes.co.uk

Provider of IT solutions including cloud, security, AI, data management, licensing, training, deployment, and managed services for diverse sectors.

Arrow Business Communicationsaro.tech

Provides cloud, collaboration, and sustainability IT solutions to major UK clients including FTSE100 companies, law firms, universities, NHS, and emergency services.

GCXgcxworld.com

Network services enabling digital transformation through managed SD-WAN, hybrid networks, and extensive subsea cloud connectivity across emerging markets and Asia.

Kervkerv.com

Kerv is a purpose-driven cloud and digital services organization providing enterprise software, consulting, networking, security, and digital transformation services across key industries

Nasstarnasstar.com

specialise in managed technology services including cloud optimisation, application modernisation, networking, security, and consultative implementation for business success

Beyondbynd.com

A design agency focused on enhancing customer experiences through strategy, technology, and design, serving diverse clients globally with a remote-first workforce

Zenzerozenzero.co.uk

Design tailored IT infrastructure solutions using proven technologies to optimize client operations and maximize value from resources.

Options Technologyoptions-it.com

Provides global financial technology solutions specializing in banking and trading infrastructure, integrating high-performance networking, cloud, security, and AI technologies.

Acora - IT, Cyber & AIacora.com

UK-based company offering IT support, cybersecurity, applications, data management, and cloud solutions to protect and optimize business technology.

PXCpxc.co.uk

Leading UK wholesale provider of connectivity, voice, cloud, and security solutions with a robust network, offering tailored support for business growth and success

Redcentricredcentricplc.com

A managed service provider delivering network, cloud, and collaboration solutions to help public and private sector organizations succeed with agile and assured services

boxxeboxxe.com

Provider of hardware, software, and managed IT services delivering flexible technology solutions to enhance productivity, security, and operational efficiency.

Positive Technologiesptsecurity.com

A leader in cybersecurity solutions, offering innovative products and services to detect and neutralize risks in corporate IT infrastructure globally

TSGtsg.com

TSG is a leading UK IT company providing comprehensive technology solutions and support including IT infrastructure, software, telecoms, broadband, and cloud computing

Telefónica Tech (EN)telefonicatech.uk

Specialist provider of integrated technology solutions including cybersecurity, cloud, data, AI, business applications, and digital workplace services.

Fortray Global Service Limitedfortray.com

Provides services for digital transformation, cybersecurity, cloud, and managed IT. Also develops talent through tech and AI bootcamps for various digital skills.

Methodsmethods.co.uk

Digital transformation partner for UK public sector, specializing in helping government agencies improve services through innovative technology solutions and cost-saving strategies

SecurityHQsecurityhq.com

It is a global cybersecurity company providing tailored solutions to enhance security posture and maximize cybersecurity investment for organizations.

Resillionresillion.com

A global leader in quality engineering, testing, and cyber security services, providing end-to-end digital testing solutions with a dedication to success and cutting-edge technology

Sapphiresapphire.net

Delivers comprehensive cyber solutions, integrating with client teams to protect digital infrastructure, mitigate risks, and maintain compliance through threat monitoring and strategic guidance.

Intercityintercity.technology

Intercity helps businesses improve their IT capabilities and solve technology issues, focusing on cloud, security, communications, and managed IT services

FSPfsp.co

A leading digital transformation specialist, helping organizations with strategy, change, digital solutions, cloud, cybersecurity, data, and AI, recognized for exceptional workplace culture

Yotiyoti.com

privacy-focused identity verification and age verification solutions helping businesses and individuals build trust while reducing fraud and enhancing data control

Micro Focus (formerly HP / Hewlett Packard Enterprise)opentext.com

A pure-play software company focused on maximizing ROI on existing software investments and enabling innovation in hybrid enterprise IT environments

Trustmarquetrustmarque.com

Delivers technology value through IT solutions, helping organizations acquire and adopt the right technology to create innovation across various IT domains.

Iomartiomart.com

Cloud computing and IT managed services provider offering secure hybrid cloud, network connectivity, data management, and digital workplace capabilities to enable businesses to operate seamlessly

GL Noble Dentondnvgl.com

Global provider of risk management services dedicated to safeguarding life, property, and the environment, with a focus on safety, innovation, and sustainability

Air IT Groupairit.co.uk

Provides managed IT services including cybersecurity, business intelligence, automation, cloud solutions, and IT support to optimize and scale SME operations.

Hammer Distributionhammerdistribution.com

An award-winning value-add distributor specializing in enterprise data storage, server, and networking solutions with a strong focus on customer service

CRESTcrest-approved.org

An international organization ensuring quality in the global cyber security industry through accreditation, certification, and collaboration with various stakeholders worldwide

Capulacapula.com

A leader in system integration for industrial environments, focusing on digital transformation and operational technology to optimize efficiency, performance, and safety

BCNbcn.co.uk

Providing managed IT services, digital transformation guidance, cloud solutions, and security expertise to help organizations innovate and compete effectively.

Elevateelevate.uk

Providing affordable, hyperfast internet access to empower individuals, drive economic growth, and foster technological innovation worldwide.

PURVIEWpurviewservices.com

Providing IT engineering and talent solutions to mid-market and Fortune 500 companies globally, with expertise in data, AI, cloud, and cybersecurity services.

MBAmba-it.com

IT solutions and services provider in London, specializing in complex applications, enterprise capabilities, and exceptional service for businesses in finance, legal, and insurance sectors

Police Digital Servicepds.police.uk

The company coordinates and delivers digital services for UK policing to use technology for public safety, working with various organizations

Bridewellbridewell.com

Trusted partner for cyber security, offering consulting and managed services, especially for Critical National Infrastructure, leveraging Microsoft Security technology for robust protection.

S-RMs-rminform.com

It is a global intelligence and cyber security consultancy, providing critical decision-making support, resilience building, and crisis response for clients.

Pen AIgudens.com

AI-powered writing tool with features like idea generation, content expansion, research assistance, overcoming writer's block, style control, grammar checking, and plagiarism detection Join the writing community

Security Blue Teamcentri.org

It provides practical defensive cybersecurity training, free courses, certifications, and platforms like Blue Team Labs Online and CySec Careers.

WorkNest Peopleworknest.com

WorkNest provides Employment Law, HR, and Health & Safety support services with technology platforms, proactive advice, and a team of experts to help employers overcome challenges

PortSwiggerportswigger.net

Develops software for web application security testing. The Burp Suite toolkit is a standard for web security professionals. Recruiting Java and .NET developers.

Immersiveimmersivelabs.com

Focuses on people-centric cyber resilience, aiming for organizations to be threat-ready and capable of demonstrating this readiness to leadership and stakeholders.

Kochokocho.co.uk

Empowering ambitious companies with Microsoft cloud solutions, identity, mobility, connectivity, and cyber security services for secure growth and business success

The Citation Groupthecitationgroup.com

This company offers compliance and quality services with a focus on HR, Employment Law, Health and Safety, ISO Certification, and more globally

Obrelaobrela.com

Provides real-time cyber risk management combining threat detection, response, and managed risk services to protect businesses worldwide.

Reliance Infosystemsreliance.systems

Provides technology inputs to support business goals, creating partnerships to leverage technology for value propositions and competitive positioning in various industries.

Aspire Technology Solutionsaspirets.com

It is a leading UK provider of managed IT, cyber security, and workplace solutions, serving over 2,000 customers effectively.

Nomad Digitalnomad-digital.com

A global leader in providing passenger and fleet management solutions for the transport industry, enhancing passenger experience and improving operational efficiency

G3g3.co

Global advisory services providing intelligence for informed decisions on deals and markets, investigations for fraud and legal support, plus cyber threat defense.

Onfidoentrust.com

This company simplifies digital identity verification through a platform that combines document, biometric, and data verifications with AI-powered analysis

KYOCERA Document Solutions UKkyoceradocumentsolutions.co.uk

Provider of eco-friendly multifunction printers, business applications, and consultative services to optimize and manage document workflows efficiently.

Six Degrees6dg.co.uk

Providing AI-enabled, people-led technology services in Core, Hybrid Cloud, Cyber Security, and Modern Work aligned with client outcomes.

eCOGRAecogra.org

An internationally accredited testing agency specializing in certifying online gambling software and systems, with expertise in information security management systems audits

Kape Technologieskape.com

It is a cybersecurity company dedicated to enhancing digital experiences through privacy and protection, with a global team of experts.

ITI Groupitigroup.com

ITI Group specializes in developing and integrating digital transformation solutions for the Energy, Nuclear, and Industrial manufacturing sectors, prioritizing safety, security, and sustainability

Quorum Cyberquorumcyber.com

Provides comprehensive cybersecurity solutions, including managed detection and response, incident response, and security consulting, helping organizations defend against cyber threats globally.

Netcraftnetcraft.com

It offers phishing detection, cybercrime disruption, and website takedown solutions to major organizations, enhancing their online security and safety.

A&O IT Groupaoitgroup.com

Provides global managed IT services, including field services, project management, warehousing, 24/7 support, network solutions, and cybersecurity consulting for various industries.

Vorbossvorboss.com

A dedicated fiber network provider in London offering 10Gbps minimum internet service for data-hungry businesses, recognized as a top workplace

Featurespacefeaturespace.com

Global leader in Enterprise Financial Crime prevention with real-time machine learning software to prevent fraud and Anti-Money Laundering for financial institutions worldwide

SBLboxxe.com

A leading IT reseller established in 1987, specializing in Information Security solutions with a comprehensive portfolio of software, hardware, services, and training

Callsigncallsign.com

pioneers digital trust using proprietary technology that mimics human identification, providing privacy, safety, and minimal friction while blocking bad actors through highly accurate AI recognition.