# The 30 largest cybersecurity companies in Paris
Tamtam tracks 290 cybersecurity companies headquartered in Paris. This list ranks the 30 largest by number of employees on LinkedIn, led by Capgemini, Sopra Steria and SFR Business. Their median headcount is 744. Half of them were founded in 2003 or later.
This selection of large companies in Paris primarily consists of IT services and consulting firms, alongside specialized cybersecurity providers. Among them are Capgemini, which delivers end-to-end services across strategy, technology, design, engineering, and business operations, and Sopra Steria, assisting large organizations with digital transformation. Exclusive Networks is a global cybersecurity specialist, while IN Groupe provides identity solutions and secure digital services. Ledger develops products for securely managing crypto assets, and YesWeHack operates a Bug Bounty and Vulnerability Management Platform.
A notable pattern among these companies is their strong focus on digital transformation, IT consulting, and cybersecurity. Many of the larger firms, such as Capgemini and Sopra Steria, offer broad IT services, while others like Exclusive Networks, OWN.Security, and YesWeHack are pure players in the cybersecurity domain. This indicates a concentration of expertise in safeguarding digital infrastructures and facilitating technological evolution within the Parisian business landscape.
馃嚝馃嚪 Paris 路 30 companies 路 Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Capgemini](https://www.tamtam.ai/c/capgemini-paris) (capgemini.com)
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 | 馃嚝馃嚪 Paris | 342,989 | |
| 2 | [Sopra Steria](https://www.tamtam.ai/c/sopra-steria) (soprasteria.com)
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 | 馃嚝馃嚪 Paris | 47,609 | |
| 3 | [SFR Business](https://www.tamtam.ai/c/sfr-business) (sfrbusiness.fr)
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 | 馃嚝馃嚪 Paris | 3,520 | 2008 |
| 4 | [Exclusive Networks](https://www.tamtam.ai/c/exclusive-networks) (exclusive-networks.com)
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 | 馃嚝馃嚪 Paris | 3,021 | 2003 |
| 5 | [IN Groupe](https://www.tamtam.ai/c/in-groupe) (ingroupe.com)
Provides identity solutions, secure digital services integrating electronics and biometrics for states, citizens, and businesses, ensuring digital sovereignty. | IT Services and IT Consulting | 馃嚝馃嚪 Paris | 1,852 | 1538 |
| 6 | [HeadMind Partners](https://www.tamtam.ai/c/headmind-partners) (headmind.com)
Advises major companies on cybersecurity, digital projects, and Artificial Intelligence, with expertise in digital risks. | Business Consulting and Services | 馃嚝馃嚪 Paris | 1,500 | 2000 |
| 7 | [RSM France](https://www.tamtam.ai/c/rsm-france) (rsm.global)
International network providing audit, accounting, and consulting services through eighteen regional locations with over thirteen hundred employees and ninety partners delivering tailored solutions. | Accounting | 馃嚝馃嚪 Paris | 1,398 | |
| 8 | [Marlink](https://www.tamtam.ai/c/marlink) (marlink.com)
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 | 馃嚝馃嚪 Paris | 1,127 | 1940 |
| 9 | [OWN.Security](https://www.tamtam.ai/c/own-security) (own.security)
Pure player in cybersecurity, offering auditing, consulting, threat intelligence, incident response, and managed SOC services to organizations of all sizes. | Computer and Network Security | 馃嚝馃嚪 Paris | 947 | 2008 |
| 10 | [ANSSI - Agence nationale de la s茅curit茅 des syst猫mes d'information](https://www.tamtam.ai/c/anssi-agence-nationale-de-la-securite-des-systemes-d-information) (cyber.gouv.fr)
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 | 馃嚝馃嚪 Paris | 867 | |
| 11 | [SQUAD - Cabinet de conseils et dexpertises](https://www.tamtam.ai/c/squad-cabinet-de-conseils-et-dexpertises) (squadgroup.com)
Offers cybersecurity consulting and expert services, adapting to evolving IT practices like cloud computing and DevOps for major companies. | IT Services and IT Consulting | 馃嚝馃嚪 Paris | 803 | 2011 |
| 12 | [Ledger](https://www.tamtam.ai/c/ledger) (ledger.com)
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 | 馃嚝馃嚪 Paris | 796 | 2014 |
| 13 | [Claranet France](https://www.tamtam.ai/c/claranet-france) (claranet.com)
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 | 馃嚝馃嚪 Paris | 750 | 1996 |
| 14 | [QESTIT Group](https://www.tamtam.ai/c/qestit-group) (qestit.com)
Specializing in software testing and quality assurance for high demand industries in Europe, with 900+ employees across 7 countries Transforming good software into perfect solutions | IT Services and IT Consulting | 馃嚝馃嚪 Paris | 749 | 1998 |
| 15 | [YesWeHack](https://www.tamtam.ai/c/yeswehack) (yeswehack.com)
Bug Bounty and Vulnerability Management Platform connecting organizations with ethical hackers for website, app, and infrastructure security, with ISO certifications | Computer and Network Security | 馃嚝馃嚪 Paris | 744 | 2015 |
| 16 | [NEVERHACK](https://www.tamtam.ai/c/neverhack) (neverhack.com)
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 | 馃嚝馃嚪 Paris | 672 | 2021 |
| 17 | [Advens](https://www.tamtam.ai/c/advens) (advens.com)
Leading cybersecurity firm protecting organizations 24/7 from cyber attackers, supporting impact projects through an endowment fund. | Computer and Network Security | 馃嚝馃嚪 Paris | 652 | 2000 |
| 18 | [Forward Global](https://www.tamtam.ai/c/forward-global) (forwardglobal.com)
Anticipating managing risks, addressing crises conflicts. Delivering services solutions integrating human expertise with technology for diverse risks. | Business Consulting and Services | 馃嚝馃嚪 Paris | 486 | 2002 |
| 19 | [Oodrive](https://www.tamtam.ai/c/oodrive) (oodrive.com)
Provides transparent tools for businesses to collaborate, communicate, and streamline operations, ensuring security, sovereignty, and compliance for users. | Software Development | 馃嚝馃嚪 Paris | 385 | 2000 |
| 20 | [Sewan Groupe](https://www.tamtam.ai/c/sewan-groupe) (sewan.fr)
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 | 馃嚝馃嚪 Paris | 384 | 2007 |
| 21 | [SYNETIS](https://www.tamtam.ai/c/synetis) (synetis.com)
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 | 馃嚝馃嚪 Paris | 351 | 2010 |
| 22 | [IMPRIMERIE NATIONALE S.A.](https://www.tamtam.ai/c/imprimerie-nationale-s-a) (ingroupe.com)
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 | 馃嚝馃嚪 Paris | 328 | 1538 |
| 23 | [EvaBssi](https://www.tamtam.ai/c/evabssi) (evabssi.com)
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 | 馃嚝馃嚪 Paris | 310 | 2007 |
| 24 | [Cyllene](https://www.tamtam.ai/c/cyllene) (groupe-cyllene.com)
Provides digital transformation through consulting, architecture, hosting, cybersecurity, application deployment, and data intelligence, emphasizing human expertise in technology solutions. | IT Services and IT Consulting | 馃嚝馃嚪 Paris | 295 | 1986 |
| 25 | [WALLIX Group](https://www.tamtam.ai/c/wallix-group) (wallix.com)
A European cybersecurity specialist providing digital identity and access security solutions to enable business continuity, regulatory compliance, and ethical digital transformation | Software Development | 馃嚝馃嚪 Paris | 277 | 2003 |
| 26 | [Yousign](https://www.tamtam.ai/c/yousign) (youtrust.com)
Yousign offers a reliable e-signature solution for companies in Europe, focusing on compliance, accessibility, and positive environmental impact. | Software Development | 馃嚝馃嚪 Paris | 247 | 2013 |
| 27 | [CEIS](https://www.tamtam.ai/c/ceis) (forwardglobal.com)
Designs and delivers services and technologies focused on managing digital, economic, and information risks for businesses and organizations. | Business Consulting and Services | 馃嚝馃嚪 Paris | 238 | 1997 |
| 28 | [Beijaflore](https://www.tamtam.ai/c/beijaflore) (join.headmind.com)
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 | 馃嚝馃嚪 Paris | 223 | 2000 |
| 29 | [Mind Technologies](https://www.tamtam.ai/c/mind-technologies) (mind-techno.fr)
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 | 馃嚝馃嚪 Paris | 201 | 1996 |
| 30 | [ReeVo Cloud & Cybers茅curit茅](https://www.tamtam.ai/c/reevo-cloud-and-cybersecurite) (reevo.fr)
Provides integrated cloud and cybersecurity services, protecting and safeguarding company data assets within secure digital strongboxes, adhering to high standards. | Computer and Network Security | 馃嚝馃嚪 Paris | 200 | 2005 |
## 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 11, 2026.
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Source: https://www.tamtam.ai/l/cybersecurity-companies-paris