# 100 leading cybersecurity companies in Europe

Tamtam tracks 2,197 cybersecurity companies headquartered in Europe. This list ranks the 100 largest by number of employees on LinkedIn, led by Capgemini, Orange and Airbus. Their median headcount is 4,008. Half of them were founded in 1996 or later. The most common headquarters are London (9), Madrid (7) and Paris (5).

These European companies are primarily large groups operating in IT services and consulting, telecommunications, and defense and aerospace manufacturing. They include organizations such as Capgemini, which delivers end-to-end services and solutions across strategy, technology, design, engineering, and business operations, and Orange, a global telecommunications operator. Other notable companies are Airbus, a pioneer in sustainable aerospace, and Thales, specializing in cybersecurity, defense, aerospace, digital identity, and secure communications.

The data shows a strong concentration of headquarters in France and the UK, with Paris and London featuring prominently. There is also a notable cluster of companies focused on defense and aerospace manufacturing, alongside a significant presence of IT services providers.

🌍 Europe · 100 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Capgemini](https://www.tamtam.ai/c/capgemini-paris) (capgemini.com)<br>Imagine future organizations, making it real with AI, technology, and people, delivering end-to-end services and solutions across strategy, technology, design, engineering and business operations | IT Services and IT Consulting | 🇫🇷 Paris | 342,989 |  |
| 2 | [Orange](https://www.tamtam.ai/c/orange-issy-les-moulineaux) (orange.com)<br>A leading global telecommunications operator offering services to millions of customers and multinational companies across 26 countries | Telecommunications | 🇫🇷 Issy-les-Moulineaux | 146,935 |  |
| 3 | [Airbus](https://www.tamtam.ai/c/airbus) (airbus.com)<br>Pioneers sustainable aerospace, designs and manufactures commercial aircraft, offers space systems, defense, security, and provides civil and military rotorcraft solutions globally. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Blagnac | 88,309 | 2014 |
| 4 | [Atos](https://www.tamtam.ai/c/atos) (atos.net)<br>Provides tailored AI-powered, end-to-end solutions for all industries, specializing in cybersecurity, cloud, and high-performance computing, fostering a secure, decarbonized future. | IT Services and IT Consulting | 🇫🇷 95877 Bezons | 85,294 |  |
| 5 | [SGS](https://www.tamtam.ai/c/sgs) (sgs.com)<br>Leading global company providing testing, inspection, and certification services to help organizations achieve high standards of quality, compliance, and sustainability. | Professional Services | 🇨🇭 Baar | 74,385 |  |
| 6 | [BT Group](https://www.tamtam.ai/c/bt-group) (bt.com)<br>A global communications services company connecting people through technology to address challenges like the pandemic, climate change, and cyber security | Telecommunications | 🇬🇧 London | 73,712 |  |
| 7 | [Thales](https://www.tamtam.ai/c/thales) (thalesgroup.com)<br>Multinational specializing in cybersecurity, defense, aerospace, digital identity, and secure communications for governments and industries. | Defense and Space Manufacturing | 🇫🇷 Meudon | 65,031 |  |
| 8 | [BAE Systems](https://www.tamtam.ai/c/bae-systems) (baesystems.com)<br>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 | Defense and Space Manufacturing | 🇬🇧 London | 55,143 | 1999 |
| 9 | [DEKRA](https://www.tamtam.ai/c/dekra) (dekra.com)<br>DEKRA provides expert safety services worldwide, including vehicle inspection, claims services, industrial inspections, training, product certification, and sustainable solutions | Public Safety | 🇩🇪 Stuttgart | 49,000 |  |
| 10 | [Sopra Steria](https://www.tamtam.ai/c/sopra-steria) (soprasteria.com)<br>Offers consulting, digital services, and solutions, assisting large companies and organizations with digital transformation, improving competitiveness through technology and collaboration. | IT Services and IT Consulting | 🇫🇷 Paris | 47,609 |  |
| 11 | [Minsait](https://www.tamtam.ai/c/minsait) (minsait.com)<br>A leading Spanish technological consultant operating globally, leveraging cloud, security, payments, and innovative technology to drive business and societal impact #MoreMinsait | IT Services and IT Consulting | 🇪🇸 Alcobendas | 45,000 | 2016 |
| 12 | [Indra Group](https://www.tamtam.ai/c/indra-group) (indragroup.com)<br>Leading multinational providing defense, space, air traffic management, and mobility solutions alongside information technology services, artificial intelligence, cybersecurity, and advanced digital transformation projects. | Defense and Space Manufacturing | 🇪🇸 Madrid | 39,308 |  |
| 13 | [Leonardo](https://www.tamtam.ai/c/leonardo) (leonardo.com)<br>Defense and security multinational company specializing in aerospace, cybersecurity, military systems, and advanced technology solutions | Defense and Space Manufacturing | 🇮🇹 Rome | 38,521 | 1948 |
| 14 | [NTT DATA Europe & Latam](https://www.tamtam.ai/c/ntt-data-europe-and-latam) (nttdata.com)<br>Global IT services provider transforming clients through consulting, solutions, and managed services to enable a confident move into the digital future | IT Services and IT Consulting | 🇪🇸 Madrid | 31,932 |  |
| 15 | [Orange Business](https://www.tamtam.ai/c/orange-business) (orange-business.com)<br>Leading European network and digital integrator leveraging expertise in next-generation connectivity, cloud, and cybersecurity solutions for positive impact on customers and planet. | IT Services and IT Consulting | 🇫🇷 Paris | 28,626 |  |
| 16 | [DNV](https://www.tamtam.ai/c/dnv) (dnv.com)<br>A global expert in risk management and assurance, setting industry benchmarks, inspiring solutions, and enabling critical decisions for safety and sustainability | Public Safety | 🇳🇴 Høvik | 22,634 |  |
| 17 | [TIM](https://www.tamtam.ai/c/tim) (gruppotim.it)<br>Provides fixed, mobile, and digital services including Cloud, IoT, and Cybersecurity, building and sharing network infrastructure in Italy and Brazil. | Telecommunications | 🇮🇹 Milan | 22,417 |  |
| 18 | [Applus+](https://www.tamtam.ai/c/applus) (applus.com)<br>A global leader in testing, inspection, and certification services, providing innovative solutions for asset integrity, regulatory compliance, and environmental performance | Business Consulting and Services | 🇪🇸 Madrid | 20,046 |  |
| 19 | [TÜV SÜD](https://www.tamtam.ai/c/tuv-sud) (tuvsud.com)<br>Experts provide testing, certification, auditing, and advisory services across various industries, ensuring safety, security, and sustainability for technological advancements and market access. | Public Safety | 🇩🇪 Munich | 18,205 | 1866 |
| 20 | [Reply](https://www.tamtam.ai/c/reply) (reply.com)<br>Specializing in innovative solutions using AI, big data, and digital media, this company delivers consulting and digital services across various sectors globally | IT Services and IT Consulting | 🇮🇹 Turin | 17,188 | 1996 |
| 21 | [Giesecke+Devrient](https://www.tamtam.ai/c/giesecke-devrient) (gi-de.com)<br>Global SecurityTech company providing digital security, financial platforms, and currency technology to enhance trust and safety worldwide. | IT Services and IT Consulting | 🇩🇪 Munich | 13,000 | 1852 |
| 22 | [IDEMIA](https://www.tamtam.ai/c/idemia) (idemia.com)<br>Provides payment, connectivity, cybersecurity, and biometric solutions to financial institutions, mobile operators, and public security organizations globally. | Software Development | 🇫🇷 Courbevoie | 12,233 |  |
| 23 | [Bechtle Schweiz AG](https://www.tamtam.ai/c/bechtle-schweiz-ag) (bechtle.com)<br>Leading IT service provider for SMEs, large customers, and public institutions, offering consulting, infrastructure, cloud, services, and software solutions throughout the entire IT life cycle. | IT Services and IT Consulting | 🇨🇭 Mägenwil | 12,000 | 1983 |
| 24 | [Engineering Group](https://www.tamtam.ai/c/engineering-group) (eng.it)<br>Leading digital transformation company with global presence, specializing in innovation, proprietary solutions, R&D, and diverse market expertise. | IT Services and IT Consulting | 🇮🇹 Rome | 11,815 | 1980 |
| 25 | [PwC Deutschland](https://www.tamtam.ai/c/pwc-deutschland) (pwc.de)<br>A leading auditing and consulting firm in Germany, offering services worldwide with expertise in assurance, tax, legal, deals, and strategy advisory | Business Consulting and Services | 🇩🇪 Frankfurt | 11,566 |  |
| 26 | [Eviden](https://www.tamtam.ai/c/eviden) (eviden.com)<br>Eviden is a global leader in digital transformation, offering expertise in digital, cloud, data, advanced computing, and security solutions to industries worldwide | IT Services and IT Consulting | 🇫🇷 Bezons | 10,793 |  |
| 27 | [T-Systems International](https://www.tamtam.ai/c/t-systems-international) (t-systems.com)<br>Provides end-to-end IT solutions, cloud migration, and industry-specific digital transformation services with strong security and global presence. | IT Services and IT Consulting | 🇩🇪 Frankfurt | 10,768 | 2000 |
| 28 | [NETWORK-SECURITY-SOLUTIONS](https://www.tamtam.ai/c/network-security-solutions) (n-security.com)<br>Specializing in managing Linux/Unix servers and large network environments with a focus on customized solutions, quality, and technological innovation | Computer and Network Security | 🇵🇱 Poznań | 10,400 | 2010 |
| 29 | [SPIE France](https://www.tamtam.ai/c/spie-france) (spie.fr)<br>Global actor in energy, digital, and industrial transitions, offering concrete solutions for decarbonizing buildings, industries, and territories through various technical services. | IT Services and IT Consulting | 🇫🇷 Cergy-Pontoise | 9,833 |  |
| 30 | [Rohde & Schwarz](https://www.tamtam.ai/c/rohde-and-schwarz) (rohde-schwarz.com)<br>Technology group creates innovations, empowers industrial, regulatory, and military customers with test, measurement, and cybersecurity solutions, pushing boundaries in AI, 6G, cloud. | Telecommunications | 🇩🇪 Munich | 9,600 | 1933 |
| 31 | [SCC](https://www.tamtam.ai/c/scc) (scc.com)<br>SCC is a leading IT group in Europe, providing limitless IT solutions, cyber security services, digital workplace solutions, and hybrid infrastructure services | IT Services and IT Consulting | 🇬🇧 Birmingham | 8,687 | 1975 |
| 32 | [Thales Cyber and Digital](https://www.tamtam.ai/c/thales-cyber-and-digital) (thalesgroup.com)<br>Design and deliver digital identification, data protection products, software, and services for secure digital services globally. | IT Services and IT Consulting | 🇫🇷 Meudon | 8,199 | 2006 |
| 33 | [Vodafone Business](https://www.tamtam.ai/c/vodafone-business) (vodafone.com)<br>Providing mobile, fixed, unified communications, IoT, cloud, and security services to businesses globally, regionally, and locally. | Telecommunications | 🇬🇧 London | 8,100 |  |
| 34 | [Accenture España](https://www.tamtam.ai/c/accenture-espana) (accenture.com)<br>A global professional services company helping businesses and governments with digital transformation, cloud technology, data analytics, and industry expertise to drive tangible outcomes | Business Consulting and Services | 🇪🇸 Madrid | 6,208 |  |
| 35 | [Astek](https://www.tamtam.ai/c/astek) (astekgroup.fr)<br>Supports clients with high-value service, deep technical expertise across technology, operations, and engineering, focusing on sustainable digital transformation with humans at the core. | IT Services and IT Consulting | 🇫🇷 Boulogne-Billancourt | 6,035 | 1988 |
| 36 | [TÜV NORD GROUP](https://www.tamtam.ai/c/tuv-nord-group) (tuev-nord-group.com)<br>Offers global consulting, service, and inspection solutions across diverse sectors including mobility, industrial services, IT, natural resources, and aerospace. | Consumer Services | 🇩🇪 Hanover | 5,960 |  |
| 37 | [KPMG España](https://www.tamtam.ai/c/kpmg-espana) (kpmg.com)<br>Professional services firm providing audit, tax, legal, financial, and business advisory with global expertise and local market knowledge. | Professional Services | 🇪🇸 Madrid | 5,523 |  |
| 38 | [QinetiQ](https://www.tamtam.ai/c/qinetiq) (qinetiq.com)<br>Integrated global defence and security company focused on mission-led innovation, testing technologies, and enabling customers to deploy enhanced capabilities for protecting lives. | Defense and Space Manufacturing | 🇬🇧 Farnborough | 5,512 |  |
| 39 | [Sophos](https://www.tamtam.ai/c/sophos) (sophos.com)<br>A global cybersecurity leader offering advanced solutions, managed services, and a broad portfolio of technologies to protect organizations from cyberattacks worldwide | Software Development | 🇬🇧 Abingdon | 5,498 | 1985 |
| 40 | [Cegeka](https://www.tamtam.ai/c/cegeka) (cegeka.com)<br>A family-owned IT solutions provider focused on creating personalized customer experiences, aiming to become the leading European orchestrator of digital business platforms | IT Services and IT Consulting | 🇧🇪 Hasselt | 5,167 | 1992 |
| 41 | [Logicalis](https://www.tamtam.ai/c/logicalis) (logicalis.com)<br>A global technology service provider helping organizations succeed in a digital-first world through cloud, connectivity, collaboration, and security solutions | IT Services and IT Consulting | 🇬🇧 Maidenhead | 4,868 | 1998 |
| 42 | [Kaspersky](https://www.tamtam.ai/c/kaspersky) (kaspersky.de)<br>Leading global cybersecurity firm working to build a safer world by securing technology to create opportunities for everyone | Computer and Network Security | 🇨🇭 Stadtkreis 1 Altstadt | 4,597 | 1997 |
| 43 | [Telefónica Tech](https://www.tamtam.ai/c/telefonica-tech) (telefonicatech.com)<br>Accelerating tech adoption through services in Cyber Security, Cloud, IoT, Big Data, AI, and Blockchain, with a strong presence on social media platforms | Telecommunications | 🇪🇸 Madrid | 4,392 |  |
| 44 | [BWI GmbH](https://www.tamtam.ai/c/bwi-gmbh) (bwi.de)<br>A leading IT service company in Germany, serving as the primary digitalization partner for the Bundeswehr, providing stable, secure, and efficient IT services domestically and abroad | IT Services and IT Consulting | 🇩🇪 Meckenheim | 4,318 | 2006 |
| 45 | [Schwarz Digits](https://www.tamtam.ai/c/schwarz-digits) (schwarz-digits.de)<br>Providing cloud, cybersecurity, data, AI, communication, and workspace solutions for businesses, public sector, and society with strong IT infrastructure. | IT Services and IT Consulting | 🇩🇪 Neckarsulm | 4,292 | 2023 |
| 46 | [Orange Cyberdefense](https://www.tamtam.ai/c/orange-cyberdefense) (orangecyberdefense.com)<br>Expert cybersecurity business unit of the Orange Group. They are a leading security provider, striving to build a safer digital society. | IT Services and IT Consulting | 🇫🇷 Nanterre | 4,274 |  |
| 47 | [GMV](https://www.tamtam.ai/c/gmv) (gmv.com)<br>A technologically advanced business group offering solutions and services in various sectors including cybersecurity, defense, healthcare, and intelligent transportation systems | IT Services and IT Consulting | 🇪🇸 Tres Cantos | 4,163 | 1984 |
| 48 | [Getronics](https://www.tamtam.ai/c/getronics-amsterdam-duivendrecht) (getronics.com)<br>Global technology solutions provider empowering businesses with tailored, secure, and sustainable IT services to drive growth, efficiency, and reduce environmental impact | IT Services and IT Consulting | 🇳🇱 Amsterdam-Duivendrecht | 4,147 | 1887 |
| 49 | [Lutech](https://www.tamtam.ai/c/lutech) (lutech.group)<br>A leading innovation company in Italy, Lutech Group offers end-to-end solutions for digital transformation, encompassing consulting, solutions, cybersecurity, services, and cloud technologies | IT Services and IT Consulting | 🇮🇹 Milan | 4,024 | 2001 |
| 50 | [KPMG Nederland](https://www.tamtam.ai/c/kpmg-nederland) (kpmg.com)<br>This company provides high-quality audit, tax, and advisory services to a wide range of clients, helping them navigate complex challenges and excel | Financial Services | 🇳🇱 Amstelveen | 4,008 |  |
| 51 | [Noventiq](https://www.tamtam.ai/c/noventiq) (noventiq.com)<br>A global digital transformation and cybersecurity solutions provider connecting 80,000+ organizations, with a diverse portfolio and active M&A strategy for growth | IT Services and IT Consulting | 🇬🇧 London | 3,941 |  |
| 52 | [Accenture DACH](https://www.tamtam.ai/c/accenture-dach) (accenture.com)<br>A global consulting firm specializing in strategy, management, digitalization, technology, and business transformation, guiding clients through innovation and operational execution | IT Services and IT Consulting | 🇩🇪 Kronberg im Taunus | 3,934 |  |
| 53 | [Atos IT Solutions and Services A/S](https://www.tamtam.ai/c/atos-it-solutions-and-services-a-s) (atos.net)<br>An international IT service provider offering high-tech transaction, consulting, system integration, and outsourcing services to a global customer base across various industries | IT Services and IT Consulting | 🇩🇰 Taastrup | 3,772 | 2011 |
| 54 | [SEP GmbH](https://www.tamtam.ai/c/sep-gmbh) (sep.de)<br>A leading German software company providing backup and disaster recovery solutions for enterprise-level customers worldwide since 1996 | Software Development | 🇩🇪 Holzkirchen | 3,741 | 1992 |
| 55 | [SFR Business](https://www.tamtam.ai/c/sfr-business) (sfrbusiness.fr)<br>Provides innovative services supporting company growth and digital transformation. Offers high-performance fixed and mobile connectivity and ICT solutions to businesses and public administrations. | Telecommunications | 🇫🇷 Paris | 3,520 | 2008 |
| 56 | [TryHackMe](https://www.tamtam.ai/c/tryhackme) (tryhackme.com)<br>It simplifies learning and teaching Cybersecurity through prebuilt courses and cloud-hosted virtual machines, ideal for CTFs, workshops, and training. | Computer and Network Security | 🇬🇧 London | 3,445 | 2018 |
| 57 | [Micro Focus](https://www.tamtam.ai/c/micro-focus) (opentext.com)<br>Provides AI, analytics, application development, modernization, and digital operations technologies to support digital transformation and smarter work processes. | IT Services and IT Consulting | 🇬🇧 Newbury | 3,383 |  |
| 58 | [BAE Systems Digital Intelligence](https://www.tamtam.ai/c/bae-systems-digital-intelligence) (baesystems.com)<br>A global team of over 4,500 experts in digital, cyber, and intelligence, collaborating to collect and analyze complex data for governments and businesses | Defense and Space Manufacturing | 🇬🇧 Guildford | 3,252 | 1971 |
| 59 | [Dekra France](https://www.tamtam.ai/c/dekra-france) (dekra.fr)<br>Inspection, certification, risk management, audits, training, and consulting services for automotive, transport, industry, environment, and safety sectors. | Environmental Services | 🇫🇷 Le Plessis Robinson | 3,188 | 1925 |
| 60 | [LRQA](https://www.tamtam.ai/c/lrqa) (lrqa.com)<br>The company provides certification, brand assurance, food safety, cybersecurity, inspection, and training services to help clients build safer, more sustainable businesses | International Trade and Development | 🇬🇧 Birmingham | 3,169 |  |
| 61 | [SVA System Vertrieb Alexander GmbH](https://www.tamtam.ai/c/sva-system-vertrieb-alexander-gmbh) (sva.de)<br>A leading system integrator in Germany, offering IT products and services, data center infrastructure, business continuity, IT service management, SAP solutions, and operational support | IT Services and IT Consulting | 🇩🇪 Wiesbaden | 3,101 | 1997 |
| 62 | [DOCAPOSTE](https://www.tamtam.ai/c/docaposte) (docaposte.com)<br>Supports companies and public institutions in digital transformation, providing secure, simple digital experiences, processing sensitive data, and ensuring digital independence with regulatory compliance. | IT Services and IT Consulting | 🇫🇷 Ivry-sur-Seine | 3,076 | 2007 |
| 63 | [Claranet](https://www.tamtam.ai/c/claranet) (claranet.com)<br>A global technology services provider offering managed services, professional services, and training in Cloud, Networks, Cyber Security, and Workplace technologies since 1996 | IT Services and IT Consulting | 🇬🇧 London | 3,073 | 1996 |
| 64 | [DGS](https://www.tamtam.ai/c/dgs) (dgsspa.com)<br>Specialized group offering security and digital transformation services, with a focus on excellence, innovation, and partnership within the ICT sector in Italy | IT Services and IT Consulting | 🇮🇹 Rome | 3,068 | 1997 |
| 65 | [Exclusive Networks](https://www.tamtam.ai/c/exclusive-networks) (exclusive-networks.com)<br>Global cybersecurity specialist driving transition to a trusted digital future, offering distribution services with innovative technologies, business models, and worldwide reach | Computer and Network Security | 🇫🇷 Paris | 3,021 | 2003 |
| 66 | [CS GROUP](https://www.tamtam.ai/c/cs-group) (cs-soprasteria.com)<br>Designs, builds, deploys, and maintains critical systems with innovative solutions and products, ensuring operational efficiency and security for client missions. | IT Services and IT Consulting | 🇫🇷 Le Plessis Robinson | 2,968 | 1968 |
| 67 | [SPIE ICS](https://www.tamtam.ai/c/spie-ics) (spie.fr)<br>Supports digital transformation for businesses with ICT solutions, providing expertise in IT infrastructure, cloud, cybersecurity, and data & IoT for enhanced performance and user well-being. | IT Services and IT Consulting | 🇫🇷 Malakoff | 2,930 | 2001 |
| 68 | [Centric](https://www.tamtam.ai/c/centric) (centric.eu)<br>A leading partner in digital transformation, providing software solutions, IT assessments, cloud services, staffing, and business process outsourcing to a diverse range of clients | IT Services and IT Consulting | 🇳🇱 Gouda | 2,900 | 1992 |
| 69 | [Quantum Security Agency](https://www.tamtam.ai/c/quantum-security-agency) (org.uk)<br>Specialized restaurant marketing agency offering solutions to help restaurants thrive through social media management, content marketing, websites, and other marketing services | Software Development | 🇬🇧 London | 2,842 | 2007 |
| 70 | [T-Systems Iberia](https://www.tamtam.ai/c/t-systems-iberia) (t-systems.com)<br>Innovative global company promoting social and ecological well-being through groundbreaking projects, offering opportunities for talent to grow professionally and personally | IT Services and IT Consulting | 🇪🇸 Barcelona | 2,822 | 2001 |
| 71 | [Darktrace](https://www.tamtam.ai/c/darktrace) (darktrace.com)<br>AI cybersecurity platform learns unique data, detects threats, and intervenes against attacks, protecting organizations worldwide from cyber-threats. | Computer and Network Security | 🇬🇧 Cambridge | 2,632 | 2013 |
| 72 | [CANCOM](https://www.tamtam.ai/c/cancom) (cancom.de)<br>Leads companies into the digital future, offering IT solutions, data-based digital solutions, managed and cloud services to reduce IT complexity and develop new business models. | IT Services and IT Consulting | 🇩🇪 Munich | 2,627 | 1992 |
| 73 | [NCC Group](https://www.tamtam.ai/c/ncc-group) (nccgroupplc.com)<br>Cybersecurity firm advising global organizations on protecting data and systems, with expertise in assessing, mitigating, and responding to cyber threats Offices worldwide | IT Services and IT Consulting | 🇬🇧 Manchester | 2,617 | 1999 |
| 74 | [Gamma](https://www.tamtam.ai/c/gamma) (gammagroup.co)<br>Gamma is a leading supplier of Unified Communications services in the UK, Germany, Spain, and Benelux, offering robust solutions for communication and collaboration | Telecommunications | 🇬🇧 London | 2,588 | 2002 |
| 75 | [NATO Communications and Information Agency (NCIA)](https://www.tamtam.ai/c/nato-communications-and-information-agency-ncia) (nato.int)<br>NATO's technology and cyber experts with a team of 3,000 members across Europe and North America, safeguarding networks and providing critical capabilities to preserve peace and security | IT Services and IT Consulting | 🇧🇪 Brussels | 2,545 | 2012 |
| 76 | [Mimecast](https://www.tamtam.ai/c/mimecast) (mimecast.com)<br>Protects humans, data, and AI agents through a unified platform, securing the workforce and their interactions with AI from cyberattacks. | Computer and Network Security | 🇬🇧 London | 2,396 | 2003 |
| 77 | [Hack The Box](https://www.tamtam.ai/c/hack-the-box) (hackthebox.com)<br>Leading platform enhancing organizational cyber resilience, battle-testing and upskilling humans and AI agents through real-world scenarios and gamified labs. | Computer and Network Security | 🇬🇧 Folkestone | 2,309 | 2017 |
| 78 | [Bitdefender](https://www.tamtam.ai/c/bitdefender) (bitdefender.com)<br>Leading cybersecurity company providing threat prevention, detection, and response solutions globally, protecting consumer, business, and government environments, and enabling cyber resiliency worldwide. | Software Development | 🇷🇴 Bucharest | 2,307 |  |
| 79 | [TINEXTA S.P.A.](https://www.tamtam.ai/c/tinexta-s-p-a) (tinexta.com)<br>An industrial group providing innovative solutions for digital transformation and growth worldwide, specializing in Digital Trust, Cyber Security, and Business Innovation sectors | IT Services and IT Consulting | 🇮🇹 Rome | 2,219 | 2009 |
| 80 | [Elektrobit](https://www.tamtam.ai/c/elektrobit) (elektrobit.com)<br>Provides software and solutions for software-defined vehicles, including operating systems, middleware, digital cockpits, and engineering services. | Software Development | 🇩🇪 Erlangen | 2,208 | 1988 |
| 81 | [Kudelski Group](https://www.tamtam.ai/c/kudelski-group) (nagra.com)<br>Leading provider integrated content protection, multi-device user experience solutions for digital television, interactive applications, cybersecurity, and Internet of Things innovations. | IT Services and IT Consulting | 🇨🇭 Cheseaux-sur-Lausanne | 2,152 | 1951 |
| 82 | [Materna](https://www.tamtam.ai/c/materna) (materna.de)<br>An internationally successful IT service provider supporting businesses and authorities with digitalization through consulting, implementation, and operation services across various sectors | IT Services and IT Consulting | 🇩🇪 Dortmund | 2,134 |  |
| 83 | [ELCA Group](https://www.tamtam.ai/c/elca-group) (elca.ch)<br>Leading Swiss provider of IT services and solutions, specializing in cybersecurity, data & AI, cloud, software development, and digital experience across industries | IT Services and IT Consulting | 🇨🇭 Pully | 2,026 | 1968 |
| 84 | [IndraMind Cybersecurity](https://www.tamtam.ai/c/indramind-cybersecurity) (indramindcybersecurity.com)<br>Specialized cybersecurity company offering comprehensive 360º services and digital identity solutions to protect businesses internationally with sector expertise. | IT Services and IT Consulting | 🇪🇸 Alcobendas | 2,000 | 1989 |
| 85 | [ETAS](https://www.tamtam.ai/c/etas) (etas.com)<br>Provides vehicle software, middleware, development tools, cloud services, and cybersecurity solutions to car manufacturers, developing and securing software-defined vehicles. | Software Development | 🇩🇪 Stuttgart | 1,994 | 1994 |
| 86 | [Acronis](https://www.tamtam.ai/c/acronis) (acronis.com)<br>This company offers cyber protection solutions including antivirus, backup, and endpoint protection to safeguard data, applications, and systems worldwide | Software Development | 🇨🇭 Schaffhausen | 1,961 | 2003 |
| 87 | [IN Groupe](https://www.tamtam.ai/c/in-groupe) (ingroupe.com)<br>Provides identity solutions, secure digital services integrating electronics and biometrics for states, citizens, and businesses, ensuring digital sovereignty. | IT Services and IT Consulting | 🇫🇷 Paris | 1,852 | 1538 |
| 88 | [Entelgy](https://www.tamtam.ai/c/entelgy) (entelgy.com)<br>A global consultancy that accelerates business transformation through innovative technological solutions, helping clients adapt and thrive in a constantly changing world | IT Services and IT Consulting | 🇪🇸 Madrid | 1,796 |  |
| 89 | [F-Secure Corporation](https://www.tamtam.ai/c/f-secure-corporation) (f-secure.com)<br>Leading cybersecurity company providing award-winning consumer products and partnering with service providers to protect millions worldwide from cyber threats. | Computer and Network Security | 🇫🇮 Helsinki | 1,791 | 1988 |
| 90 | [Advania Sweden](https://www.tamtam.ai/c/advania-sweden) (advania.se)<br>Leading Nordic IT provider customizing services and products for corporate customers in public and private sectors across the Nordics with global offerings in data center and communication services | IT Services and IT Consulting | 🇸🇪 Stockholm | 1,775 | 1939 |
| 91 | [ELT Group](https://www.tamtam.ai/c/elt-group) (eltgroup.net)<br>A global leader in electronic defense systems, specializing in managing the electromagnetic spectrum and offering technology solutions for defense, cyber, space, and biodefense | Defense and Space Manufacturing | 🇮🇹 Rome | 1,728 | 1951 |
| 92 | [All for One](https://www.tamtam.ai/c/all-for-one) (all-for-one.com)<br>An innovative IT services company with over 2,800 experts, focusing on digital transformation for 3,000+ customers in the DACH region | IT Services and IT Consulting | 🇩🇪 Filderstadt-Bernhausen | 1,671 |  |
| 93 | [Hardware](https://www.tamtam.ai/c/hardware) (kubus.com)<br>A hardware company formed in 2003 is now Kubus Group Limited Follow on LinkedIn for company updates, employee information, and career opportunities | IT Services and IT Consulting | 🇬🇧 Cirencester | 1,667 | 2003 |
| 94 | [MTI](https://www.tamtam.ai/c/mti-staines-upon-thames) (mti.com)<br>Provides comprehensive cybersecurity and data centre technology solutions, managed services, and consulting to support secure, compliant IT infrastructure management. | IT Services and IT Consulting | 🇬🇧 Staines-upon-Thames | 1,660 | 1987 |
| 95 | [MTI Technology GmbH](https://www.tamtam.ai/c/mti-technology-gmbh) (de.mti.com)<br>A reliable partner offering storage, backup, datacenter optimization, security, cloud solutions, and managed services to guide businesses through digital transformation successfully | IT Services and IT Consulting | 🇩🇪 Wiesbaden | 1,655 | 1988 |
| 96 | [CBTW](https://www.tamtam.ai/c/cbtw) (cbtw.tech)<br>Global tech solutions company focusing on collaboration, strategy, technology, and design to create purposeful products and invest in education initiatives globally | IT Services and IT Consulting | 🇧🇪 Brussels | 1,646 |  |
| 97 | [Sectra](https://www.tamtam.ai/c/sectra) (sectra.com)<br>A company providing solutions for medical imaging IT and cybersecurity to enhance efficiency in healthcare and protect sensitive information for authorities and defense forces | IT Services and IT Consulting | 🇸🇪 Linköping | 1,638 | 1978 |
| 98 | [Airbus Protect](https://www.tamtam.ai/c/airbus-protect) (airbus.com)<br>A subsidiary of Airbus specializing in cybersecurity, safety, and sustainability services, offering advisory, consulting, training, and software solutions for risk management | Business Consulting and Services | 🇫🇷 Blagnac | 1,614 |  |
| 99 | [Visiativ](https://www.tamtam.ai/c/visiativ) (visiativ.com)<br>Delivers smarter working methods for agility, efficiency, and collaboration. Provides digital tools and practices, driving sustainable performance for businesses through tailored roadmaps. | IT Services and IT Consulting | 🇫🇷 Lyon | 1,578 | 1987 |
| 100 | [itm8 Danmark](https://www.tamtam.ai/c/itm8-danmark) (itm8.dk)<br>Global IT provider focused on Cloud Services, Digital Transformation, Application Services, and Cyber Security Guiding clients through complexity with innovative solutions | IT Services and IT Consulting | 🇩🇰 Herning | 1,571 | 2021 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 12, 2026.

## More company lists in Europe

- [The largest companies in Europe](https://www.tamtam.ai/l/largest-companies-in-europe) (213,553)
- [Multinational companies in Europe](https://www.tamtam.ai/l/multinational-companies-in-europe) (42,025)
- [Companies with in-house R&D in Europe](https://www.tamtam.ai/l/r-and-d-companies-in-europe) (20,169)
- [Retail chains in Europe](https://www.tamtam.ai/l/retail-chains-in-europe) (19,259)
- [Manufacturers in Europe](https://www.tamtam.ai/l/manufacturers-in-europe) (18,156)
- [Professional services firms in Europe](https://www.tamtam.ai/l/professional-services-firms-in-europe) (13,698)
- [SaaS companies in Europe](https://www.tamtam.ai/l/saas-companies-in-europe) (13,682)
- [Software Development companies in Europe](https://www.tamtam.ai/l/software-development-companies-in-europe) (12,950)
- [Financial services firms in Europe](https://www.tamtam.ai/l/financial-services-firms-in-europe) (12,943)
- [IT Services and IT Consulting companies in Europe](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-in-europe) (11,705)
- [IT services companies in Europe](https://www.tamtam.ai/l/it-services-companies-in-europe) (11,376)
- [Hardware manufacturers in Europe](https://www.tamtam.ai/l/hardware-companies-in-europe) (10,565)
- [Family-owned companies in Europe](https://www.tamtam.ai/l/family-owned-companies-in-europe) (9,878)
- [Critical infrastructure operators in Europe](https://www.tamtam.ai/l/critical-infrastructure-operators-in-europe) (9,815)
- [Financial Services companies in Europe](https://www.tamtam.ai/l/financial-services-companies-in-europe) (9,480)
- [Consulting firms in Europe](https://www.tamtam.ai/l/consulting-firms-in-europe) (8,900)
- [Public sector organisations in Europe](https://www.tamtam.ai/l/public-sector-organisations-in-europe) (8,568)
- [Education providers in Europe](https://www.tamtam.ai/l/education-companies-in-europe) (7,925)
- [Companies with a mobile app in Europe](https://www.tamtam.ai/l/companies-with-mobile-app-in-europe) (7,898)
- [Distributors and wholesalers in Europe](https://www.tamtam.ai/l/distributors-and-wholesalers-in-europe) (7,573)
- [Retail companies in Europe](https://www.tamtam.ai/l/retail-companies-in-europe) (6,240)
- [Healthcare providers in Europe](https://www.tamtam.ai/l/healthcare-providers-in-europe) (6,132)
- [E-commerce companies in Europe](https://www.tamtam.ai/l/ecommerce-companies-in-europe) (5,864)
- [Hotel and hospitality groups in Europe](https://www.tamtam.ai/l/hospitality-groups-in-europe) (5,741)

## The same list elsewhere

- [Cybersecurity companies in the world](https://www.tamtam.ai/l/cybersecurity-companies-in-the-world) (3,776)
- [Cybersecurity companies in France](https://www.tamtam.ai/l/cybersecurity-companies-france) (958)
- [Cybersecurity companies in the United Kingdom](https://www.tamtam.ai/l/cybersecurity-companies-united-kingdom) (549)
- [Cybersecurity companies in Switzerland](https://www.tamtam.ai/l/cybersecurity-companies-switzerland) (120)
- [Cybersecurity companies in Germany](https://www.tamtam.ai/l/cybersecurity-companies-germany) (113)
- [Cybersecurity companies in Spain](https://www.tamtam.ai/l/cybersecurity-companies-spain) (77)
- [Cybersecurity companies in Italy](https://www.tamtam.ai/l/cybersecurity-companies-italy) (73)
- [Cybersecurity companies in Belgium](https://www.tamtam.ai/l/cybersecurity-companies-belgium) (69)
- [Cybersecurity companies in the Netherlands](https://www.tamtam.ai/l/cybersecurity-companies-netherlands) (55)

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Source: https://www.tamtam.ai/l/cybersecurity-companies-in-europe