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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
SIB [numérique, santé et secteur public]sib.fr
Innovative cooperative in digital health and public sector, serving 620+ institutions in modernizing their IT systems with a wide range of services and expertise |
499 | |||
| 2 |
Hexatelhexatel.fr
Support for businesses and communities in telecom, networks, and IT with personalized, high-quality, and carefully selected technology solutions. |
257 | |||
| 3 |
BLUEbt-blue.com
For over 15 years, this company specializes in providing high-speed network, data hosting, and unified communication solutions to professionals in a secure environment |
216 | |||
| 4 |
Sekoiasekoia.com
Building a cyber operations platform for the AI era, unifying threat intelligence, detection, response, and exposure management, making advanced defense accessible. |
165 | |||
| 5 |
Secure-ICsecure-ic.com
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 |
151 | |||
| 6 |
IDnow Franceidnow.io
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 |
119 | |||
| 7 | 64 | ||||
| 8 |
Provectioprovectio.fr
IT services provider offering IT management, security, cloud computing, telecommunications, and network availability for businesses, providing support, strategy, and technical expertise |
48 | |||
| 9 |
Groupe Pandoragroupe-pandora.com
Support for telecom and IT projects across northern France, offering technical expertise, personalized services, and strong team collaboration. |
42 | |||
| 10 |
ORNISECornisec.com
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 |
35 | |||
| 11 | 32 | ||||
| 12 |
EDSIedsisecurity.com
Specialized R&D company with 25 years of experience in Embedded Security, securing products and evaluating resistance to field attacks Subsidiary of Kudelski Group |
28 | |||
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| 13 |
RETIS Connected Solutionsapixit.fr
Specialized engineers design, deploy, and maintain network and security solutions with 24/7 hotline support for customer infrastructure supervision. |
27 | |||
| 14 |
Ouest Consulting IP3Gouest-consulting.net
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 |
26 | |||
| 15 |
Hogohogo.eu
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 |
26 | |||
| 16 |
Rubycatrubycat.eu
Publisher specializing in traceability and access control for sensitive information systems, reinforcing security policies for privileged users. Providing advanced audit tools. |
20 | |||
| 17 |
Sensing Visionsensingvision.com
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 |
19 | |||
| 18 |
A3BC GROUPa3bc.io
The company engineers biometric-based digital ID and strong authentication services to build trust in the physical, digital, and metaverse world |
16 | |||
| 19 |
Cloud-IAMcloud-iam.com
Offers managed, secure identity and access management built on Keycloak, centralizing authentication, access rights, and user journeys for various users, ensuring compliance and support. |
16 | |||
| 20 |
Wallackwallack.fr
Established in 2019 by 2 cybersecurity engineers, this company specializes in cybersecurity for SMEs and intermediate-sized businesses, offering services from strategy to implementation |
12 | |||
| 21 |
Shadlineshadline.fr
An autonomous digital survival system providing collaborative tools and guaranteed data access to overcome cyber attacks and ensure business continuity |
9 | |||
| 22 | 6 | ||||
| 23 |
Infraproinfrapro.fr
This company offers Digital remote services in various domains, specializing in Lean consulting, ERP integration, process optimization, website building, and software automation |
5 | |||
| 24 |
CALIDRAcalidra.io
SaaS platform delivering personalized e-learning and phishing campaigns to enhance employee cybersecurity awareness and strengthen organizational defense. |
4 | |||
| 25 |
Malizenwallix.com
The company provides data visualization and machine learning solutions to enhance cybersecurity team capabilities in a comprehensive visual environment |
4 | |||
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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 1,454
- Companies with in-house R&D in the Ille-et-Vilaine department 152
- Retail chains in the Ille-et-Vilaine department 135
- Multinational companies in the Ille-et-Vilaine department 118
- Manufacturers in the Ille-et-Vilaine department 100
- Professional services firms in the Ille-et-Vilaine department 94
- SaaS companies in the Ille-et-Vilaine department 85
- Family-owned companies in the Ille-et-Vilaine department 81
- Software Development companies in the Ille-et-Vilaine department 80
- Public sector organisations in the Ille-et-Vilaine department 75
- IT Services and IT Consulting companies in the Ille-et-Vilaine department 67
- IT services companies in the Ille-et-Vilaine department 65
- Hardware manufacturers in the Ille-et-Vilaine department 61
- Education providers in the Ille-et-Vilaine department 60
- Distributors and wholesalers in the Ille-et-Vilaine department 58
- Consulting firms in the Ille-et-Vilaine department 54
- Food and Beverage Manufacturing companies in the Ille-et-Vilaine department 46
- Retail companies in the Ille-et-Vilaine department 46
- Critical infrastructure operators in the Ille-et-Vilaine department 45
- Financial services firms in the Ille-et-Vilaine department 45
- Subscription businesses in the Ille-et-Vilaine department 45
- Construction companies in the Ille-et-Vilaine department 43
- Law Practice companies in the Ille-et-Vilaine department 43
- Higher Education companies in the Ille-et-Vilaine department 41
The same list elsewhere in France
- Cybersecurity companies in France 958
- Cybersecurity companies in Île-de-France 525
- Cybersecurity companies in the Hauts-de-Seine department 154
- Cybersecurity companies in Auvergne-Rhône-Alpes 91
- Cybersecurity companies in Occitanie 49
- Cybersecurity companies in Provence-Alpes-Côte d'Azur 48
- Cybersecurity companies in the Rhône department 48
- Cybersecurity companies in Hauts-de-France 44
- Cybersecurity companies in Grand Est 40
- Cybersecurity companies in Brittany 37
- Cybersecurity companies in the Bouches-du-Rhône department 36
- Cybersecurity companies in Nouvelle-Aquitaine 35
- Cybersecurity companies in the Nord department 30
- Cybersecurity companies in Pays de la Loire 28
- Cybersecurity companies in the Haute-Garonne department 27
- Cybersecurity companies in the Yvelines department 25
- Cybersecurity companies in Paris 290