# List of cybersecurity companies in the Ille-et-Vilaine department

Tamtam tracks 25 cybersecurity companies headquartered in the Ille-et-Vilaine department. This list ranks all of them by number of employees on LinkedIn, led by SIB [numérique, santé et secteur public], Hexatel and BLUE. Their median headcount is 27. Half of them were founded in 2016 or later. The most common headquarters are Rennes (13) and Cesson-Sévigné (6).

The cybersecurity companies in Ille-et-Vilaine primarily operate in IT services, telecommunications, and network security. This selection includes a mix of established firms and younger companies. SIB, for example, is a cooperative in digital health and the public sector, while Hexatel supports businesses in telecom and IT. Sekoia focuses on building a cyber operations platform, and Secure-IC provides cybersecurity solutions for embedded systems.

A notable pattern among these companies is their geographical concentration. Many of the larger firms, such as SIB, Sekoia, Provectio, and Groupe Pandora, are headquartered in Rennes. Cesson-Sévigné also hosts several cybersecurity businesses, including Secure-IC, IDnow France, and GLIMPS, indicating a cluster of expertise in these two cities within the department.

🇫🇷 Ille-et-Vilaine · 25 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [SIB \[numérique, santé et secteur public\]](https://www.tamtam.ai/c/sib-numerique-sante-et-secteur-public) (sib.fr)<br>Innovative cooperative in digital health and public sector, serving 620+ institutions in modernizing their IT systems with a wide range of services and expertise | IT Services and IT Consulting | 🇫🇷 Rennes | 499 | 1993 |
| 2 | [Hexatel](https://www.tamtam.ai/c/hexatel) (hexatel.fr)<br>Support for businesses and communities in telecom, networks, and IT with personalized, high-quality, and carefully selected technology solutions. | Telecommunications | 🇫🇷 Noyal-sur-Vilaine | 257 | 1946 |
| 3 | [BLUE](https://www.tamtam.ai/c/blue) (bt-blue.com)<br>For over 15 years, this company specializes in providing high-speed network, data hosting, and unified communication solutions to professionals in a secure environment | IT System Data Services | 🇫🇷 Châteaubourg | 216 | 2005 |
| 4 | [Sekoia](https://www.tamtam.ai/c/sekoia) (sekoia.com)<br>Building a cyber operations platform for the AI era, unifying threat intelligence, detection, response, and exposure management, making advanced defense accessible. | Computer and Network Security | 🇫🇷 Rennes | 165 | 2022 |
| 5 | [Secure-IC](https://www.tamtam.ai/c/secure-ic) (secure-ic.com)<br>Global provider of cybersecurity solutions for embedded systems & connected objects Offers end-to-end protection technologies, Secure Elements, & evaluation platforms Expanding worldwide with innovative approach | Semiconductor Manufacturing | 🇫🇷 Cesson-Sévigné | 151 | 2010 |
| 6 | [IDnow France](https://www.tamtam.ai/c/idnow-france) (idnow.io)<br>The company is a leading European provider of identity verification solutions, aiming to make the digital world safer with a comprehensive range of secure verification methods | IT Services and IT Consulting | 🇫🇷 Cesson-Sévigné | 119 | 2014 |
| 7 | [GLIMPS](https://www.tamtam.ai/c/glimps) (glimps.re)<br>A French cybersecurity editor specializing in file analysis and malware detection using a unique technology called GLIMPS Deep Engine | Computer and Network Security | 🇫🇷 Cesson-Sévigné | 64 | 2019 |
| 8 | [Provectio](https://www.tamtam.ai/c/provectio) (provectio.fr)<br>IT services provider offering IT management, security, cloud computing, telecommunications, and network availability for businesses, providing support, strategy, and technical expertise | Telecommunications | 🇫🇷 Rennes | 48 | 2004 |
| 9 | [Groupe Pandora](https://www.tamtam.ai/c/groupe-pandora) (groupe-pandora.com)<br>Support for telecom and IT projects across northern France, offering technical expertise, personalized services, and strong team collaboration. | Telecommunications | 🇫🇷 Rennes | 42 | 2011 |
| 10 | [ORNISEC](https://www.tamtam.ai/c/ornisec) (ornisec.com)<br>ORNISEC is a leading cybersecurity consultancy firm offering services such as advice, audits, training, compliance, crisis management, putting a focus on practical and hands-on approach | Computer and Network Security | 🇫🇷 Rennes | 35 | 2020 |
| 11 | [ACCEIS](https://www.tamtam.ai/c/acceis) (acceis.fr)<br>ACCEIS is a cybersecurity expertise center providing tailored services including audit, consulting, training, and evaluation to secure clients' activities They prioritize excellence and client relationships | Business Consulting and Services | 🇫🇷 Rennes | 32 | 2015 |
| 12 | [EDSI](https://www.tamtam.ai/c/edsi-cesson-sevigne) (edsisecurity.com)<br>Specialized R&D company with 25 years of experience in Embedded Security, securing products and evaluating resistance to field attacks Subsidiary of Kudelski Group | Software Development | 🇫🇷 Cesson-Sévigné | 28 | 1990 |
| 13 | [RETIS Connected Solutions](https://www.tamtam.ai/c/retis-connected-solutions) (apixit.fr)<br>Specialized engineers design, deploy, and maintain network and security solutions with 24/7 hotline support for customer infrastructure supervision. | Computer Networking Products | 🇫🇷 Montauban-de-Bretagne | 27 | 1993 |
| 14 | [Ouest Consulting IP3G](https://www.tamtam.ai/c/ouest-consulting-ip3g) (ouest-consulting.net)<br>OUEST CONSULTING IP3G specializes in infrastructure development and management, integrating cutting-edge IT, networking, and telecom technologies for businesses and local governments in Western France | IT Services and IT Consulting | 🇫🇷 Cesson-Sévigné | 26 |  |
| 15 | [Hogo](https://www.tamtam.ai/c/hogo) (hogo.eu)<br>Specializing in cybersecurity, this company provides integrated solutions for securing data exchanges via removable devices and developing "White Stations" for French markets They offer decontamination and data transfer solutions, custom developments, and continuous innovation in cyber defense | Computer and Network Security | 🇫🇷 Rennes | 26 | 2016 |
| 16 | [Rubycat](https://www.tamtam.ai/c/rubycat) (rubycat.eu)<br>Publisher specializing in traceability and access control for sensitive information systems, reinforcing security policies for privileged users. Providing advanced audit tools. | Software Development | 🇫🇷 Cesson-Sévigné | 20 | 2014 |
| 17 | [Sensing Vision](https://www.tamtam.ai/c/sensing-vision) (sensingvision.com)<br>Sensing Vision optimizes building operating costs through non-intrusive, cost-effective measurement solutions, personalized insights, data security, using IoT, AI, cloud, and open data technologies | IT Services and IT Consulting | 🇫🇷 Betton | 19 | 2017 |
| 18 | [A3BC GROUP](https://www.tamtam.ai/c/a3bc-group) (a3bc.io)<br>The company engineers biometric-based digital ID and strong authentication services to build trust in the physical, digital, and metaverse world | Computer and Network Security | 🇫🇷 Rennes | 16 | 2018 |
| 19 | [Cloud-IAM](https://www.tamtam.ai/c/cloud-iam) (cloud-iam.com)<br>Offers managed, secure identity and access management built on Keycloak, centralizing authentication, access rights, and user journeys for various users, ensuring compliance and support. | Computer and Network Security | 🇫🇷 Rennes | 16 | 2021 |
| 20 | [Wallack](https://www.tamtam.ai/c/wallack) (wallack.fr)<br>Established in 2019 by 2 cybersecurity engineers, this company specializes in cybersecurity for SMEs and intermediate-sized businesses, offering services from strategy to implementation | Computer and Network Security | 🇫🇷 Le Rheu | 12 | 2019 |
| 21 | [Shadline](https://www.tamtam.ai/c/shadline) (shadline.fr)<br>An autonomous digital survival system providing collaborative tools and guaranteed data access to overcome cyber attacks and ensure business continuity | Computer and Network Security | 🇫🇷 Rennes | 9 | 2014 |
| 22 | [Sekost](https://www.tamtam.ai/c/sekost) (sekost.fr)<br>Specializing in cybersecurity diagnostics, our company helps organizations assess their security posture, identify issues, and facilitate rapid improvements in protection | Computer and Network Security | 🇫🇷 Rennes | 6 | 2021 |
| 23 | [Infrapro](https://www.tamtam.ai/c/infrapro) (infrapro.fr)<br>This company offers Digital remote services in various domains, specializing in Lean consulting, ERP integration, process optimization, website building, and software automation | IT Services and IT Consulting | 🇫🇷 Saint-Malo | 5 | 2024 |
| 24 | [CALIDRA](https://www.tamtam.ai/c/calidra) (calidra.io)<br>SaaS platform delivering personalized e-learning and phishing campaigns to enhance employee cybersecurity awareness and strengthen organizational defense. | Software Development | 🇫🇷 Rennes | 4 | 2023 |
| 25 | [Malizen](https://www.tamtam.ai/c/malizen) (wallix.com)<br>The company provides data visualization and machine learning solutions to enhance cybersecurity team capabilities in a comprehensive visual environment | Computer and Network Security | 🇫🇷 Rennes | 4 | 2020 |

## 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 the Ille-et-Vilaine department

- [The largest companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/largest-companies-ille-et-vilaine) (1,454)
- [Companies with in-house R&D in the Ille-et-Vilaine department](https://www.tamtam.ai/l/r-and-d-companies-ille-et-vilaine) (152)
- [Retail chains in the Ille-et-Vilaine department](https://www.tamtam.ai/l/retail-chains-ille-et-vilaine) (135)
- [Multinational companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/multinational-companies-ille-et-vilaine) (118)
- [Manufacturers in the Ille-et-Vilaine department](https://www.tamtam.ai/l/manufacturers-ille-et-vilaine) (100)
- [Professional services firms in the Ille-et-Vilaine department](https://www.tamtam.ai/l/professional-services-firms-ille-et-vilaine) (94)
- [SaaS companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/saas-companies-ille-et-vilaine) (85)
- [Family-owned companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/family-owned-companies-ille-et-vilaine) (81)
- [Software Development companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/software-development-companies-ille-et-vilaine) (80)
- [Public sector organisations in the Ille-et-Vilaine department](https://www.tamtam.ai/l/public-sector-organisations-ille-et-vilaine) (75)
- [IT Services and IT Consulting companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ille-et-vilaine) (67)
- [IT services companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/it-services-companies-ille-et-vilaine) (65)
- [Hardware manufacturers in the Ille-et-Vilaine department](https://www.tamtam.ai/l/hardware-companies-ille-et-vilaine) (61)
- [Education providers in the Ille-et-Vilaine department](https://www.tamtam.ai/l/education-companies-ille-et-vilaine) (60)
- [Distributors and wholesalers in the Ille-et-Vilaine department](https://www.tamtam.ai/l/distributors-and-wholesalers-ille-et-vilaine) (58)
- [Consulting firms in the Ille-et-Vilaine department](https://www.tamtam.ai/l/consulting-firms-ille-et-vilaine) (54)
- [Food and Beverage Manufacturing companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/food-and-beverage-manufacturing-companies-ille-et-vilaine) (46)
- [Retail companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/retail-companies-ille-et-vilaine) (46)
- [Critical infrastructure operators in the Ille-et-Vilaine department](https://www.tamtam.ai/l/critical-infrastructure-operators-ille-et-vilaine) (45)
- [Financial services firms in the Ille-et-Vilaine department](https://www.tamtam.ai/l/financial-services-firms-ille-et-vilaine) (45)
- [Subscription businesses in the Ille-et-Vilaine department](https://www.tamtam.ai/l/subscription-businesses-ille-et-vilaine) (45)
- [Construction companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/construction-companies-ille-et-vilaine) (43)
- [Law Practice companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/law-practice-companies-ille-et-vilaine) (43)
- [Higher Education companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/higher-education-companies-ille-et-vilaine) (41)

## The same list elsewhere in France

- [Cybersecurity companies in France](https://www.tamtam.ai/l/cybersecurity-companies-france) (958)
- [Cybersecurity companies in Île-de-France](https://www.tamtam.ai/l/cybersecurity-companies-ile-de-france) (525)
- [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) (91)
- [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 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) (2,197)

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Source: https://www.tamtam.ai/l/cybersecurity-companies-ille-et-vilaine