# List of cybersecurity companies in Île-de-France

Tamtam tracks 525 cybersecurity companies headquartered in Île-de-France. This list ranks the 100 largest by number of employees on LinkedIn, led by Capgemini, Orange and Atos. Their median headcount is 310. Half of them were founded in 2003 or later. The most common headquarters are Paris (36), Boulogne-Billancourt (6) and Puteaux (6).

The cybersecurity sector in Île-de-France is dominated by large groups in IT services, telecommunications, and defense. These companies offer a wide range of solutions, from digital transformation and cloud services to specialized cybersecurity and secure communications. Key players include Capgemini, which delivers end-to-end services with AI and technology, and Orange, a global telecommunications operator. Thales specializes in cybersecurity, defense, and digital identity, while Atos focuses on AI-powered solutions including cybersecurity and cloud.

A notable pattern among these companies is the strong presence of major corporate headquarters within Paris and its immediate surrounding suburbs like Issy-les-Moulineaux, Meudon, and Bezons. This indicates a concentration of strategic and operational centers for large-scale cybersecurity and IT operations in the region. Other significant firms are Sopra Steria, assisting with digital transformation, and Exclusive Networks, a global cybersecurity specialist.

🇫🇷 Île-de-France · 100 companies · Updated Nov 13, 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 | [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 |  |
| 4 | [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 |  |
| 5 | [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 |  |
| 6 | [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 |  |
| 7 | [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 |  |
| 8 | [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 |
| 9 | [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 |  |
| 10 | [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 |
| 11 | [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 |
| 12 | [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 |
| 13 | [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 |
| 14 | [HeadMind Partners](https://www.tamtam.ai/c/headmind-partners) (headmind.com)<br>Advises major companies on cybersecurity, digital projects, and Artificial Intelligence, with expertise in digital risks. | Business Consulting and Services | 🇫🇷 Paris | 1,500 | 2000 |
| 15 | [SCC France](https://www.tamtam.ai/c/scc-france) (scc.com)<br>Provides comprehensive IT solutions, including cybersecurity, digital workplace, and hybrid infrastructure, enabling businesses to optimize operations and achieve their goals. | IT Services and IT Consulting | 🇫🇷 Nanterre | 1,422 | 1975 |
| 16 | [RSM France](https://www.tamtam.ai/c/rsm-france) (rsm.global)<br>International network providing audit, accounting, and consulting services through eighteen regional locations with over thirteen hundred employees and ninety partners delivering tailored solutions. | Accounting | 🇫🇷 Paris | 1,398 |  |
| 17 | [NXO France](https://www.tamtam.ai/c/nxo-france) (nxo.eu)<br>Independent leader in French Telecom integration, undertaking complex projects, anticipating customer needs, attracting talent, and focusing on well-done work. | IT Services and IT Consulting | 🇫🇷 Puteaux | 1,200 |  |
| 18 | [Axians France](https://www.tamtam.ai/c/axians-france) (axians.fr)<br>Supports clients with digital infrastructure and solutions, covering applications, data, networks, cloud, telecom, and cybersecurity through consulting, design, integration, and services. | IT Services and IT Consulting | 🇫🇷 Nanterre | 1,137 | 1999 |
| 19 | [Marlink](https://www.tamtam.ai/c/marlink) (marlink.com)<br>Designs, builds, and manages hybrid network solutions, combining satellite, terrestrial, and digital services to optimize remote business operations with digital technologies. | IT Services and IT Consulting | 🇫🇷 Paris | 1,127 | 1940 |
| 20 | [Fime](https://www.tamtam.ai/c/fime) (fime.com)<br>Enables creation, launch of secure solutions across payments, smart mobility, and digital identity. Provides strategic consulting, testing expertise globally. | IT Services and IT Consulting | 🇫🇷 Paris | 1,108 | 1962 |
| 21 | [Nomios Group](https://www.tamtam.ai/c/nomios-group) (nomios.com)<br>Designs, secures, and manages digital infrastructures, developing innovative cybersecurity and networking solutions through consulting, managed, and professional services for organizations. | Computer and Network Security | 🇫🇷 Boulogne-Billancourt | 887 | 2004 |
| 22 | [ANSSI - Agence nationale de la sécurité des systèmes d'information](https://www.tamtam.ai/c/anssi-agence-nationale-de-la-securite-des-systemes-d-information) (cyber.gouv.fr)<br>National authority for cybersecurity and cyber defense, protecting the nation from cyberattacks by defending critical systems, sharing knowledge, and regulating cybersecurity. | Computer and Network Security | 🇫🇷 Paris | 867 |  |
| 23 | [Ledger](https://www.tamtam.ai/c/ledger) (ledger.com)<br>Develops products and services for individuals and companies to securely buy, store, swap, grow, and manage crypto assets, including hardware wallets. | Computer and Network Security | 🇫🇷 Paris | 796 | 2014 |
| 24 | [Claranet France](https://www.tamtam.ai/c/claranet-france) (claranet.com)<br>Leading European provider of managed hosting, network, and communication services, serving thousands of businesses across multiple countries and data centers. | IT Services and IT Consulting | 🇫🇷 Paris | 750 | 1996 |
| 25 | [YesWeHack](https://www.tamtam.ai/c/yeswehack) (yeswehack.com)<br>Bug Bounty and Vulnerability Management Platform connecting organizations with ethical hackers for website, app, and infrastructure security, with ISO certifications | Computer and Network Security | 🇫🇷 Paris | 744 | 2015 |
| 26 | [NEVERHACK](https://www.tamtam.ai/c/neverhack) (neverhack.com)<br>Provides innovative and ethical cybersecurity solutions, supporting businesses and individuals in protecting their data through consulting, training, risk assessment, and AI-driven innovations. | Computer and Network Security | 🇫🇷 Paris | 672 | 2021 |
| 27 | [Hub One](https://www.tamtam.ai/c/hub-one) (hubone.fr)<br>Hub One, a technology group, provides digital evolution services for businesses in various sectors They offer connectivity solutions for communication, networking, and mobility | Telecommunications | 🇫🇷 Tremblay-en-France | 645 | 2001 |
| 28 | [Tenexa](https://www.tamtam.ai/c/tenexa) (tenexa.com)<br>Offers digital services through subsidiaries, focusing on Cloud, cybersecurity, and global IT outsourcing from data centers to users, supporting client innovation strategies. | IT Services and IT Consulting | 🇫🇷 Roissy CDG Cedex | 624 | 1985 |
| 29 | [oXya](https://www.tamtam.ai/c/oxya) (oxya.com)<br>Leading provider of SAP technical services, cloud solutions, and hosting for midsize and global organizations, enhancing efficiency and flexibility of SAP infrastructure worldwide | IT Services and IT Consulting | 🇫🇷 Issy-les-Moulineaux | 586 |  |
| 30 | [Devoteam \| Google Cloud Partner](https://www.tamtam.ai/c/devoteam-google-cloud-partner) (gcloud.devoteam.com)<br>Provides innovative Google Cloud solutions across AI, IT modernization, security, and work transformation, with expertise in migrating users and assisting organizations. | IT Services and IT Consulting | 🇫🇷 Levallois-Perret | 579 |  |
| 31 | [Nexpublica](https://www.tamtam.ai/c/nexpublica) (nexpublica.com)<br>Develops innovative, secure software solutions for public, parapublic, and private sectors, supporting over 4,000 public and 1,200 private organizations. | Software Development | 🇫🇷 Clichy | 559 |  |
| 32 | [ChapsVision](https://www.tamtam.ai/c/chapsvision) (chapsvision.com)<br>French software company specializing in data intelligence and AI, providing industry-specific solutions for diverse sectors, supporting digital transformation globally. | Software Development | 🇫🇷 Suresnes | 558 | 2019 |
| 33 | [CELESTE](https://www.tamtam.ai/c/celeste-champs-sur-marne) (celeste.fr)<br>A national provider of internet access and connectivity solutions for businesses, offering innovative, high-availability, and eco-friendly services such as fiber optic connections and cloud hosting | Telecommunications | 🇫🇷 Champs-sur-Marne | 537 | 2001 |
| 34 | [Paritel](https://www.tamtam.ai/c/paritel) (paritel.fr)<br>Paritel, a telecom operator for small businesses, prioritizes performance and individual talent while fostering teamwork and career development for its 700 employees | Telecommunications | 🇫🇷 Bois-Colombes | 501 | 1991 |
| 35 | [Equans Digital](https://www.tamtam.ai/c/equans-digital) (equans-digital.com)<br>Connects operational and information technology systems to structure infrastructure data, improving energy efficiency, asset availability, and security through cybersecurity and applied artificial intelligence. | IT Services and IT Consulting | 🇫🇷 Courbevoie | 499 |  |
| 36 | [Thales Cybersecurity Services](https://www.tamtam.ai/c/thales-cybersecurity-services) (thalesgroup.com)<br>Delivering cybersecurity products and services. Protecting organizations by identifying, detecting, and responding to cyber threats. Specializing in data security and digital infrastructure protection for diverse sectors. | Computer and Network Security | 🇫🇷 Meudon | 495 | 2018 |
| 37 | [Scutum France](https://www.tamtam.ai/c/scutum-france) (scutum-group.com)<br>Providing customized safety and security solutions including electronic security, defense, and fire prevention for governments and organizations. | Security and Investigations | 🇫🇷 Rungis | 492 | 1989 |
| 38 | [Linkt](https://www.tamtam.ai/c/linkt) (linkt.fr)<br>Provides managed services, telecom, and cybersecurity expertise for mid-sized and large companies, and local authorities, to optimize and secure their digital infrastructure. | Telecommunications | 🇫🇷 Puteaux | 463 | 2016 |
| 39 | [METSYS](https://www.tamtam.ai/c/metsys) (metsys.fr)<br>Advises clients on cybersecurity, infrastructure, and cloud solution design and implementation. Over 500 employees across France, 93.2M in revenue. | IT Services and IT Consulting | 🇫🇷 Boulogne-Billancourt | 435 | 2011 |
| 40 | [Stormshield](https://www.tamtam.ai/c/stormshield) (stormshield.com)<br>Provides certified cybersecurity solutions for critical infrastructure, sensitive data, and operational environments to ensure cyber-serenity for clients globally. | Computer and Network Security | 🇫🇷 Issy-les-Moulineaux | 433 | 2014 |
| 41 | [Almond](https://www.tamtam.ai/c/almond) (almond.eu)<br>Formed from NetXP and Provadys, positioned as a major independent French player in audit and consulting for Cybersecurity, Cloud, and Infrastructure. | IT Services and IT Consulting | 🇫🇷 Sèvres | 424 | 2006 |
| 42 | [Sewan Groupe](https://www.tamtam.ai/c/sewan-groupe) (sewan.fr)<br>Cloud operator and host providing essential communication services to businesses, with a national network of over 1000 partners serving 75,000 companies and 2000 mid-sized enterprises | Telecommunications | 🇫🇷 Paris | 384 | 2007 |
| 43 | [Saphir Group](https://www.tamtam.ai/c/saphir-group) (quariq.com)<br>Provides Industry 4.0 solutions, industrial automation, MES/MOM, PLM, data and AI, OT security for manufacturers, from strategy to execution globally. | IT Services and IT Consulting | 🇫🇷 Montigny-le-Bretonneux | 380 | 2024 |
| 44 | [Devoteam \| Cyber Trust](https://www.tamtam.ai/c/devoteam-cyber-trust) (devoteam.com)<br>Empowering clients to protect digital transformation by managing risks and deploying innovative cybersecurity solutions, ensuring resilience in the digital age | IT Services and IT Consulting | 🇫🇷 Levallois-Perret | 374 | 1995 |
| 45 | [ADENTIS](https://www.tamtam.ai/c/adentis) (adentis.fr)<br>High-tech consulting company developing software and embedded systems for digital TV, telecom, medical electronics, defense, and aeronautics. Research lab. | IT Services and IT Consulting | 🇫🇷 Boulogne-Billancourt | 362 | 2000 |
| 46 | [SYNETIS](https://www.tamtam.ai/c/synetis) (synetis.com)<br>Leading French cybersecurity consulting firm, assisting companies with information systems security, offering audits, GRC, digital identity, operational security, and training. | IT Services and IT Consulting | 🇫🇷 Paris | 351 | 2010 |
| 47 | [Avanquest](https://www.tamtam.ai/c/avanquest) (avanquestgroup.com)<br>A leading software publisher offering PDF, Security, and Photo products, utilizing cutting edge technology to enhance user experience worldwide | Software Development | 🇫🇷 Courbevoie | 340 | 1984 |
| 48 | [Foliateam](https://www.tamtam.ai/c/foliateam) (foliateam.com)<br>FOLIATEAM offers secure cloud telephony, IT, and cybersecurity solutions for businesses and public organizations, providing reliable networks, cloud services, and tailored support | IT Services and IT Consulting | 🇫🇷 Saint-Maur-des-Fossés | 335 | 2002 |
| 49 | [IMPRIMERIE NATIONALE S.A.](https://www.tamtam.ai/c/imprimerie-nationale-s-a) (ingroupe.com)<br>Provides secure identity solutions including electronic components, biometrics integration, polycarbonate cards, digital services, and complex printing for governments and businesses worldwide. | IT Services and IT Consulting | 🇫🇷 Paris | 328 | 1538 |
| 50 | [Cloud Temple](https://www.tamtam.ai/c/cloud-temple) (cloud-temple.com)<br>Provides IT transformation, hosting, and outsourcing for critical business applications. Guides customers from conception to maintenance across various IT verticals, specializing in private cloud. | IT Services and IT Consulting | 🇫🇷 Puteaux | 310 | 2017 |
| 51 | [EvaBssi](https://www.tamtam.ai/c/evabssi) (evabssi.com)<br>International consulting firm specializing in cybersecurity and information system performance, helping clients manage cyber risks and build innovative, efficient IS. | IT Services and IT Consulting | 🇫🇷 Paris | 310 | 2007 |
| 52 | [Airbus Defence and Space Cyber](https://www.tamtam.ai/c/airbus-defence-and-space-cyber) (cyber.airbus.com)<br>Designing, developing, integrating, and deploying reliable cyber security solutions for defense, governmental, and institutional customers, leveraging 30 years of expertise. | IT Services and IT Consulting | 🇫🇷 Élancourt | 308 |  |
| 53 | [NEXTEDIA](https://www.tamtam.ai/c/nextedia) (nextedia.com)<br>The Nextedia Group specializes in Cybersecurity, Cloud, Digital Workspace, and Customer Experience, providing expertise and solutions to large companies across various sectors | IT Services and IT Consulting | 🇫🇷 Puteaux | 305 |  |
| 54 | [APIXIT](https://www.tamtam.ai/c/apixit) (apixit.fr)<br>Provides cybersecurity, infrastructure, and cloud solutions, supporting clients through audits, consulting, integration, maintenance, and managed services for digital transformation. | IT Services and IT Consulting | 🇫🇷 Les Ulis | 303 | 1992 |
| 55 | [Cyllene](https://www.tamtam.ai/c/cyllene) (groupe-cyllene.com)<br>Provides digital transformation through consulting, architecture, hosting, cybersecurity, application deployment, and data intelligence, emphasizing human expertise in technology solutions. | IT Services and IT Consulting | 🇫🇷 Paris | 295 | 1986 |
| 56 | [act digital EMEA - Alter Solutions](https://www.tamtam.ai/c/act-digital-emea-alter-solutions) (actdigital.com)<br>AI-first multinational technology company providing customized, scalable solutions with local agility and global expertise to create business value. | IT Services and IT Consulting | 🇫🇷 Versailles | 284 | 2006 |
| 57 | [WALLIX Group](https://www.tamtam.ai/c/wallix-group) (wallix.com)<br>A European cybersecurity specialist providing digital identity and access security solutions to enable business continuity, regulatory compliance, and ethical digital transformation | Software Development | 🇫🇷 Paris | 277 | 2003 |
| 58 | [FORMIND](https://www.tamtam.ai/c/formind) (formind.fr)<br>French independent cybersecurity expert with 300+ consultants, offering consulting, integration, SOC & CERT services. Reinforcing client resilience against digital risks globally. | IT Services and IT Consulting | 🇫🇷 Issy-les-Moulineaux | 254 | 2010 |
| 59 | [Yousign](https://www.tamtam.ai/c/yousign) (youtrust.com)<br>Yousign offers a reliable e-signature solution for companies in Europe, focusing on compliance, accessibility, and positive environmental impact. | Software Development | 🇫🇷 Paris | 247 | 2013 |
| 60 | [C2S](https://www.tamtam.ai/c/c2s-issy-les-moulineaux) (bouyguestelecom-business.fr)<br>Providing IT services and innovative solutions in information systems, supported by partnerships and dynamic research and development activities. | IT Services and IT Consulting | 🇫🇷 Issy-les-Moulineaux | 243 |  |
| 61 | [CEIS](https://www.tamtam.ai/c/ceis) (forwardglobal.com)<br>Designs and delivers services and technologies focused on managing digital, economic, and information risks for businesses and organizations. | Business Consulting and Services | 🇫🇷 Paris | 238 | 1997 |
| 62 | [Intrinsec](https://www.tamtam.ai/c/intrinsec) (intrinsec.com)<br>An information security company with 20 years of experience, specializing in building services for better protection of customers' businesses | Computer and Network Security | 🇫🇷 Courbevoie | 233 | 1995 |
| 63 | [Cegedim Outsourcing](https://www.tamtam.ai/c/cegedim-outsourcing) (cegedim-outsourcing.fr)<br>Specializes in IT and BPO services with strong technological partnerships, providing high-level technical expertise and independent consulting. | IT Services and IT Consulting | 🇫🇷 Velizy-Villacoublay | 230 |  |
| 64 | [Viaccess-Orca](https://www.tamtam.ai/c/viaccess-orca) (viaccess-orca.com)<br>Provides premium TV platforms, OTT, and content protection globally, delivering, protecting, and monetizing advanced TV services for operators, broadcasters, and content providers. | Telecommunications | 🇫🇷 Courbevoie | 226 | 2012 |
| 65 | [Beijaflore](https://www.tamtam.ai/c/beijaflore) (join.headmind.com)<br>An international operational consulting firm specializing in digital strategy, with offices in multiple cities, helping organizations build and enhance their digital strategies | Business Consulting and Services | 🇫🇷 Paris | 223 | 2000 |
| 66 | [TVH Consulting](https://www.tamtam.ai/c/tvh-consulting) (tvhconsulting.fr)<br>An international software company specializing in ERP solutions, systems integration, and industry-specific solutions for various verticals globally | IT Services and IT Consulting | 🇫🇷 Maisons-Laffitte | 221 | 2003 |
| 67 | [LCIE Bureau Veritas](https://www.tamtam.ai/c/lcie-bureau-veritas) (lcie.fr)<br>Support for electrical product compliance through testing, certification, audits, inspections, and training to access global markets efficiently. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Fontenay-Aux-Roses | 216 | 1882 |
| 68 | [Médiane Système](https://www.tamtam.ai/c/mediane-systeme) (medianesysteme.com)<br>Specializes in custom secure real-time operating systems, private 5G networks, embedded AI, cybersecurity, and industrial network solutions. | Software Development | 🇫🇷 Le Pecq | 213 | 1989 |
| 69 | [Mind Technologies](https://www.tamtam.ai/c/mind-technologies) (mind-techno.fr)<br>Specializing in securing IP infrastructures for over two decades through a comprehensive and uncompromising approach, ensuring continuous control and alignment of mindsets | IT Services and IT Consulting | 🇫🇷 Paris | 201 | 1996 |
| 70 | [ReeVo Cloud & Cybersécurité](https://www.tamtam.ai/c/reevo-cloud-and-cybersecurite) (reevo.fr)<br>Provides integrated cloud and cybersecurity services, protecting and safeguarding company data assets within secure digital strongboxes, adhering to high standards. | Computer and Network Security | 🇫🇷 Paris | 200 | 2005 |
| 71 | [Yogosha](https://www.tamtam.ai/c/yogosha) (yogosha.com)<br>Provides an offensive security testing platform for companies and governments, leveraging expert hackers to find and remediate vulnerabilities. | Computer and Network Security | 🇫🇷 Paris | 195 | 2015 |
| 72 | [INTERDATA](https://www.tamtam.ai/c/interdata) (interdata.fr)<br>French company providing certified expertise in IT networks, SI security, and observability for over 40 years Offering tailored services for reliable, scalable, and secure network management | Computer Networking Products | 🇫🇷 Les Ulis | 188 | 1979 |
| 73 | [Synacktiv](https://www.tamtam.ai/c/synacktiv) (synacktiv.com)<br>A leading offensive security company specializing in penetration testing, security audits, reverse-engineering, vulnerability research, and development of security tools | IT Services and IT Consulting | 🇫🇷 Paris | 188 | 2012 |
| 74 | [GitGuardian](https://www.tamtam.ai/c/gitguardian) (gitguardian.com)<br>Cybersecurity startup automating secrets detection in source code to prevent credentials from being compromised or exposed, helping secure software development globally | Computer and Network Security | 🇫🇷 Paris | 182 | 2017 |
| 75 | [Stoïk](https://www.tamtam.ai/c/stoik) (stoik.com)<br>European wholesale broker specializing in cyber risk for SMEs, providing unique services for small and medium-sized businesses to manage and mitigate cyber risks effectively | Insurance | 🇫🇷 Paris | 180 | 2021 |
| 76 | [Prolival](https://www.tamtam.ai/c/prolival) (prolival.fr)<br>A French IT company specializing in designing, implementing, and managing IT infrastructures for clients, ensuring successful project completion with skilled teams and proven methods | IT Services and IT Consulting | 🇫🇷 Colombes | 178 | 1994 |
| 77 | [Exaprobe](https://www.tamtam.ai/c/exaprobe) (econocom.com)<br>Supports companies through digital transformation, defining, integrating, and operating digital services and infrastructure for network, security, communication, both in-house and cloud. | IT Services and IT Consulting | 🇫🇷 Le Plessis-Robinson | 173 | 2002 |
| 78 | [ERCOM](https://www.tamtam.ai/c/ercom) (thalesgroup.com)<br>Provides cutting-edge cybersecurity and communication network solutions, including certified secure mobile communication, end-to-end encrypted data sharing, and secure messaging applications for professionals. | Computer and Network Security | 🇫🇷 Velizy-Villacoublay | 170 | 1986 |
| 79 | [ON-X Groupe](https://www.tamtam.ai/c/on-x-groupe) (on-x.com)<br>An independent French consultancy firm specializing in digital technology integration for companies, government agencies, and local authorities with 30 years of experience and 5 competence centers | IT Services and IT Consulting | 🇫🇷 Puteaux | 169 | 1986 |
| 80 | [Exeo](https://www.tamtam.ai/c/exeo) (exeo.net)<br>Multi-specialist managed services provider offering cloud migration, cybersecurity risk management, and business process automation across global markets. | IT Services and IT Consulting | 🇫🇷 Paris | 164 | 2012 |
| 81 | [NEVERHACK France](https://www.tamtam.ai/c/neverhack-france) (neverhack.com)<br>French group specializes in cybersecurity for businesses and individuals, offering consulting, training, cyber risk assessment, and AI innovations to secure digital world. | IT Services and IT Consulting | 🇫🇷 Paris | 160 | 1983 |
| 82 | [cegedim.cloud](https://www.tamtam.ai/c/cegedim-cloud) (cegedim.cloud)<br>Cloud hosting provider offering secure, high-performance services including managed hosting, virtual servers, and colocation, with expertise in healthcare software and data security | IT Services and IT Consulting | 🇫🇷 Boulogne-Billancourt | 160 |  |
| 83 | [CybelAngel](https://www.tamtam.ai/c/cybelangel) (cybelangel.com)<br>Combines AI, human expertise to detect, analyze, and counter cyber threats, identifying data at risk and threat ecosystems for global enterprises. | Computer and Network Security | 🇫🇷 Clichy | 158 | 2013 |
| 84 | [Novelis](https://www.tamtam.ai/c/novelis) (novelis.io)<br>Specializes in offering comprehensive solutions and services combining process expertise with Process Intelligence, intelligent automation, AI advancements, innovative architectures, and cybersecurity. | IT Services and IT Consulting | 🇫🇷 Paris | 152 | 2017 |
| 85 | [Exclusive Networks ME](https://www.tamtam.ai/c/exclusive-networks-me) (exclusive-networks.com)<br>Global digital infrastructure specialist empowering partners to capitalize on evolving technologies, with services-first ideology and presence in 100+ countries | IT Services and IT Consulting | 🇫🇷 Paris | 148 |  |
| 86 | [Alleo de Bouygues Telecom](https://www.tamtam.ai/c/alleo-de-bouygues-telecom) (alleo.fr)<br>Provides IT and telecom solutions including cybersecurity, VoIP integration, managed services, and local customer support with certified professionals. | Telecommunications | 🇫🇷 Clichy | 144 |  |
| 87 | [SOLENT SAS](https://www.tamtam.ai/c/solent-sas) (solent.fr)<br>Provides software engineering solutions focused on equipping users to navigate effectively in challenging, high-wind conditions. | IT Services and IT Consulting | 🇫🇷 La Garenne-Colombes | 139 | 2003 |
| 88 | [HarfangLab](https://www.tamtam.ai/c/harfanglab) (harfanglab.io)<br>This company provides Endpoint Detection & Response solutions enriched with AI and threat intelligence to identify, analyze, and eliminate security threats | Computer and Network Security | 🇫🇷 Paris | 136 | 2018 |
| 89 | [Dstny FR](https://www.tamtam.ai/c/dstny-fr) (dstny.fr)<br>Provides cloud-based unified communication tools integrating voice, video, chat, mobile, and cybersecurity for businesses across various sectors. | Telecommunications | 🇫🇷 Clichy | 136 |  |
| 90 | [GROUPE ROS DIGITAL](https://www.tamtam.ai/c/groupe-ros-digital) (rosdigital.fr)<br>A comprehensive group offering printing solutions, IT services, cloud storage, telecom solutions, communication products, and LED lighting expertise with dedicated specialists in each field | IT Services and IT Consulting | 🇫🇷 Chatou | 136 | 2001 |
| 91 | [ITS Integra](https://www.tamtam.ai/c/its-integra) (itsintegra.com)<br>ITS Integra is a subsidiary of ITS Group, specializing in off-site hosting and IT management for clients, focusing on customized services and added value | IT Services and IT Consulting | 🇫🇷 Boulogne-Billancourt | 134 | 1996 |
| 92 | [ScaleSquad](https://www.tamtam.ai/c/scalesquad) (scalesquad.io)<br>Implementation and management of tailored cloud solutions for mid-sized companies, ensuring strategic, financial, and operational integration with change management support. | IT Services and IT Consulting | 🇫🇷 Nanterre | 124 | 2017 |
| 93 | [TEHTRIS](https://www.tamtam.ai/c/tehtris) (tehtris.com)<br>Develops a cybersecurity platform for automatic real-time neutralization of cyberattacks, providing holistic infrastructure views and guaranteeing data confidentiality for major players and administrations. | Computer and Network Security | 🇫🇷 Pessac | 123 | 2010 |
| 94 | [Synelience Group](https://www.tamtam.ai/c/synelience-group) (synelience.group)<br>Offers diverse digital services: cybersecurity, network infrastructure, software, IoT, outsourcing, cloud, and high-speed broadband, enhancing client IT resources. | IT Services and IT Consulting | 🇫🇷 Puteaux | 119 |  |
| 95 | [Nameshield Group](https://www.tamtam.ai/c/nameshield-group) (nameshield.com)<br>Provides domain name management, security, risk mitigation, and monitoring services with ISO 27001 certification and expert support teams. | Software Development | 🇫🇷 Paris | 119 | 1994 |
| 96 | [Trustpair](https://www.tamtam.ai/c/trustpair) (trustpair.com)<br>Company offers automated fraud prevention for business payments, verifying account ownership and integrating with existing systems to secure finance processes worldwide. | Software Development | 🇫🇷 Paris | 118 | 2017 |
| 97 | [XMCO](https://www.tamtam.ai/c/xmco) (xmco.fr)<br>Independent French company offering penetration tests, security audits, gap analysis, PCI DSS certification, vulnerability watch, threat intelligence, and forensics. | Computer and Network Security | 🇫🇷 Paris | 117 | 2002 |
| 98 | [La Home Sweet Company](https://www.tamtam.ai/c/la-home-sweet-company) (lahsc.fr)<br>A community of specialists leveraging collective intelligence to provide IT mastery and innovative solutions, specializing in Dev-Sec-Ops through tailored platforms and cybersecurity services | IT Services and IT Consulting | 🇫🇷 Courbevoie | 116 | 2011 |
| 99 | [OSIIC - Opérateur des Systèmes d’Information Interministériels Classifiés](https://www.tamtam.ai/c/osiic-operateur-des-systemes-d-information-interministeriels-classifies)<br>The Operator of Classified Interministerial Information Systems implements classified information services for the French President, Government, and ministries | Computer and Network Security | 🇫🇷 Paris | 111 | 2020 |
| 100 | [Groupe EOLEN](https://www.tamtam.ai/c/groupe-eolen) (geci.net)<br>Provision of engineering and consulting services across finance, industry, telecommunications, transport, and energy sectors, covering project lifecycles from preliminary design to maintenance. | IT Services and IT Consulting | 🇫🇷 Boulogne-Billancourt | 109 | 2006 |

## 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 13, 2026.

## More company lists in Île-de-France

- [The largest companies in Île-de-France](https://www.tamtam.ai/l/largest-companies-ile-de-france) (36,121)
- [Multinational companies in Île-de-France](https://www.tamtam.ai/l/multinational-companies-ile-de-france) (6,026)
- [Professional services firms in Île-de-France](https://www.tamtam.ai/l/professional-services-firms-ile-de-france) (3,376)
- [SaaS companies in Île-de-France](https://www.tamtam.ai/l/saas-companies-ile-de-france) (2,859)
- [IT Services and IT Consulting companies in Île-de-France](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ile-de-france) (2,776)
- [Companies with in-house R&D in Île-de-France](https://www.tamtam.ai/l/r-and-d-companies-ile-de-france) (2,695)
- [IT services companies in Île-de-France](https://www.tamtam.ai/l/it-services-companies-ile-de-france) (2,623)
- [Consulting firms in Île-de-France](https://www.tamtam.ai/l/consulting-firms-ile-de-france) (2,407)
- [Retail chains in Île-de-France](https://www.tamtam.ai/l/retail-chains-ile-de-france) (2,314)
- [Software Development companies in Île-de-France](https://www.tamtam.ai/l/software-development-companies-ile-de-france) (1,992)
- [Business Consulting and Services companies in Île-de-France](https://www.tamtam.ai/l/business-consulting-and-services-companies-ile-de-france) (1,903)
- [Financial services firms in Île-de-France](https://www.tamtam.ai/l/financial-services-firms-ile-de-france) (1,729)
- [Manufacturers in Île-de-France](https://www.tamtam.ai/l/manufacturers-ile-de-france) (1,515)
- [Law Practice companies in Île-de-France](https://www.tamtam.ai/l/law-practice-companies-ile-de-france) (1,366)
- [Subscription businesses in Île-de-France](https://www.tamtam.ai/l/subscription-businesses-ile-de-france) (1,359)
- [Education providers in Île-de-France](https://www.tamtam.ai/l/education-companies-ile-de-france) (1,300)
- [Advertising Services companies in Île-de-France](https://www.tamtam.ai/l/advertising-services-companies-ile-de-france) (1,261)
- [Financial Services companies in Île-de-France](https://www.tamtam.ai/l/financial-services-companies-ile-de-france) (1,196)
- [Marketing and communications agencies in Île-de-France](https://www.tamtam.ai/l/marketing-agencies-ile-de-france) (1,173)
- [Hardware manufacturers in Île-de-France](https://www.tamtam.ai/l/hardware-companies-ile-de-france) (1,142)
- [Companies with a mobile app in Île-de-France](https://www.tamtam.ai/l/companies-with-mobile-app-ile-de-france) (1,105)
- [Recruitment and staffing agencies in Île-de-France](https://www.tamtam.ai/l/recruitment-agencies-ile-de-france) (1,013)
- [Public sector organisations in Île-de-France](https://www.tamtam.ai/l/public-sector-organisations-ile-de-france) (989)
- [Technology, Information and Internet companies in Île-de-France](https://www.tamtam.ai/l/technology-information-and-internet-companies-ile-de-france) (982)

## The same list elsewhere in France

- [Cybersecurity companies in France](https://www.tamtam.ai/l/cybersecurity-companies-france) (957)
- [Cybersecurity companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/cybersecurity-companies-hauts-de-seine) (154)
- [Cybersecurity companies in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/cybersecurity-companies-auvergne-rhone-alpes) (90)
- [Cybersecurity companies in Occitanie](https://www.tamtam.ai/l/cybersecurity-companies-occitanie) (49)
- [Cybersecurity companies in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/cybersecurity-companies-provence-alpes-cote-dazur) (48)
- [Cybersecurity companies in the Rhône department](https://www.tamtam.ai/l/cybersecurity-companies-rhone) (48)
- [Cybersecurity companies in Hauts-de-France](https://www.tamtam.ai/l/cybersecurity-companies-hauts-de-france) (44)
- [Cybersecurity companies in Grand Est](https://www.tamtam.ai/l/cybersecurity-companies-grand-est) (40)
- [Cybersecurity companies in Brittany](https://www.tamtam.ai/l/cybersecurity-companies-brittany) (37)
- [Cybersecurity companies in the Bouches-du-Rhône department](https://www.tamtam.ai/l/cybersecurity-companies-bouches-du-rhone) (36)
- [Cybersecurity companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/cybersecurity-companies-nouvelle-aquitaine) (35)
- [Cybersecurity companies in the Nord department](https://www.tamtam.ai/l/cybersecurity-companies-nord) (30)
- [Cybersecurity companies in Pays de la Loire](https://www.tamtam.ai/l/cybersecurity-companies-pays-de-la-loire) (28)
- [Cybersecurity companies in the Haute-Garonne department](https://www.tamtam.ai/l/cybersecurity-companies-haute-garonne) (27)
- [Cybersecurity companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/cybersecurity-companies-ille-et-vilaine) (25)
- [Cybersecurity companies in the Yvelines department](https://www.tamtam.ai/l/cybersecurity-companies-yvelines) (25)
- [Cybersecurity companies in Paris](https://www.tamtam.ai/l/cybersecurity-companies-paris) (290)

## The same list elsewhere

- [Cybersecurity companies in the world](https://www.tamtam.ai/l/cybersecurity-companies-in-the-world) (3,776)
- [Cybersecurity companies in Europe](https://www.tamtam.ai/l/cybersecurity-companies-in-europe) (2,196)

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Source: https://www.tamtam.ai/l/cybersecurity-companies-ile-de-france