These companies in Ille-et-Vilaine are primarily IT services and consulting firms, ranging from mid-sized companies to smaller, specialized enterprises. Notable examples include SIB, a cooperative in digital health and public sector IT, and RBI, which focuses on information system design and integration. OET specializes in industrial automation and robotics, while Hexatel supports businesses with telecommunications and network solutions. Groupe Creative assists clients with IT and digital transformation projects, and BLUE provides high-speed network and data hosting services.
The data shows a strong concentration of these companies in Rennes, with many others located in nearby towns such as Pacé, Betton, and Saint-Grégoire. The founding dates indicate a mix of established firms, like Hexatel (1946) and OET (1975), and more recently established companies, such as LIKSI (2017) and Ovalt (2017), suggesting ongoing development in the region's IT and industrial sectors.
| # | 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 |
RBIrbi-informatique.fr
Specializing in information systems design, implementation, and integration, RBI-Informatique offers services in infrastructure, collaboration, and management solutions for businesses |
468 | |||
| 3 |
OETgroupe-ovalt.com
Independent service company specializing in MES, automation, robotics, electrical systems, and weighing with turnkey solutions and maintenance across multiple sites. |
266 | |||
| 4 |
Hexatelhexatel.fr
Support for businesses and communities in telecom, networks, and IT with personalized, high-quality, and carefully selected technology solutions. |
257 | |||
| 5 |
Groupe Creativegroupe-creative.fr
Works with clients on IT and digital transformation projects, offering expertise in consulting, creation, development, research, and innovation across various digital domains. |
232 | |||
| 6 |
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 | |||
| 7 |
Sodifrancesodifrance.fr
Provides technology consulting, digital transformation, data management, application and infrastructure services to enhance organizational competitiveness and collaboration. |
172 | |||
| 8 |
TALENDItalendi.com
A social enterprise offering industrial and digital services, employing over 550 people, including 420 with disabilities, with expertise in various fields like assembly and logistics |
137 | |||
| 9 |
Adventieladventiel.fr
Adventiel is a specialized consultancy firm assisting agricultural and food industries in transitioning to sustainable models through customized digital solutions |
107 | |||
| 10 | 100 | ||||
| 11 | 90 | ||||
| 12 | 88 | ||||
| 13 |
Ovaltgroupe-ovalt.com
Group of expert subsidiaries providing digital transformation services and solutions to modernize factories and support Industry 4.0 initiatives. |
77 | |||
| 14 | 64 | ||||
| 15 |
Groupe A2COMa2com.fr
A2COM Group supports healthcare organizations in digital evolution with innovative solutions to simplify access to technology and improve medical services efficiency |
64 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
AJP - Groupe Factoriaajp.fr
Specialized in workplace technologies for over 30 years, offering printing equipment, IT solutions, document digitalization, telephony, cloud services, audiovisual, and office space design |
59 | |||
| 17 |
Digitalisdigitalis.fr
Digitalis specializes in providing custom, user-friendly audiovisual solutions to enhance workspaces, focusing on innovation, simplicity, and productivity for businesses and institutions |
51 | |||
| 18 |
Provectioprovectio.fr
IT services provider offering IT management, security, cloud computing, telecommunications, and network availability for businesses, providing support, strategy, and technical expertise |
48 | |||
| 19 | 46 | ||||
| 20 | 46 | ||||
| 21 |
Groupe Pandoragroupe-pandora.com
Support for telecom and IT projects across northern France, offering technical expertise, personalized services, and strong team collaboration. |
42 | |||
| 22 |
SpikeeLabsspikeelabs.fr
SpikeeLabs provides information system design, development, integration, and support services with a focus on growth, innovation, and strong human values |
38 | |||
| 23 |
MAX Digital Servicesmaxds.fr
MAX DS is a digital services company focused on a collaborative model, prioritizing human values to provide high-quality consulting, software engineering, testing, and project management services |
34 | |||
| 24 |
Cognix Systemscognix-systems.com
Consulting, designing, and developing websites, advanced web applications, and software with a focus on ergonomic, high-value web portals. |
34 | |||
| 25 |
OGI Groupeogi-groupe.fr
OGI provides successful IT project implementation and management services to companies of all sizes and sectors, offering expertise in software deployment and infrastructure setup |
33 | |||
| 26 |
Synergizsynergiz.com
Provides intuitive, connected, and interactive solutions, specializing in Mixed Reality. Supports businesses with XR projects from start to finish including hardware, software, and custom development. |
32 | |||
| 27 |
SEMAPHORSsemaphors.com
Established in 1996, specializing in healthcare sector Providing quality IT services, software solutions, telephony, and medical devices for healthcare professionals in the western region |
30 | |||
| 28 |
Abelium Entreprisesinformatique-logiciel-bretagne.com
A reliable and proactive IT partner providing quality services tailored to clients' needs, with a focus on innovation, technical expertise, and customer support |
28 | |||
| 29 |
RETIS Connected Solutionsapixit.fr
Specialized engineers design, deploy, and maintain network and security solutions with 24/7 hotline support for customer infrastructure supervision. |
27 | |||
| 30 |
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 | |||
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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
- 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
- Legal Services companies in the Ille-et-Vilaine department 41
The same list elsewhere in France
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- IT services companies in Île-de-France 2,624
- IT services companies in the Hauts-de-Seine department 737
- IT services companies in Auvergne-Rhône-Alpes 519
- IT services companies in the Rhône department 286
- IT services companies in Occitanie 280
- IT services companies in Provence-Alpes-Côte d'Azur 268
- IT services companies in Grand Est 248
- IT services companies in Hauts-de-France 236
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- IT services companies in Nouvelle-Aquitaine 194
- IT services companies in the Nord department 170
- IT services companies in the Haute-Garonne department 158
- IT services companies in the Bouches-du-Rhône department 155
- IT services companies in the Loire-Atlantique department 130
- IT services companies in the Yvelines department 121
- IT services companies in Brittany 113
- IT services companies in the Val-de-Marne department 101
- IT services companies in the Gironde department 99
- IT services companies in Paris 1,386
- IT services companies in Lyon 171
- IT services companies in Boulogne-Billancourt 125
- IT services companies in Toulouse 119
- IT services companies in Levallois-Perret 94