The companies listed are primarily large public and private organizations in the healthcare and banking sectors, alongside key public administration bodies within Ille-et-Vilaine. Many of these entities are well-established, contributing significantly to the region's infrastructure and services.
Notable examples include Vivalto Santé, which operates a network of healthcare facilities, and CHU de Rennes, a large public hospital. Banque Populaire Grand Ouest and Crédit Agricole d'Ille-et-Vilaine are significant regional banks. Rennes Ville et Métropole manages urban development and public services, while SDIS 35 handles emergency rescue missions. A clear pattern is the dominance of headquarters in Rennes and Saint-Grégoire, indicating these cities as major administrative and economic hubs within the department.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Vivalto Santévivalto-sante.fr
Operates a network of healthcare facilities across Europe, providing comprehensive patient care. Engages in medical partnerships and sustainable practices. |
4,612 | |||
| 2 |
CHU de Renneschu-rennes.fr
Large French public hospital offering extensive medical, surgical, and obstetrical services, advanced diagnostics, research, and medical training to the population. |
3,470 | |||
| 3 |
Banque Populaire Grand Ouestbanquepopulaire.fr
Cooperative regional bank supporting entrepreneurs, artisans, and businesses across seven departments, fostering economic development through financial and human expertise. |
2,642 | |||
| 4 |
Rennes Ville et Métropolerennes.fr
Fosters economic, urban development, attracting talent and students. Provides diverse public services through 5300 agents, focusing on quality of life and professional growth. |
1,828 | |||
| 5 |
Crédit Agricole d'Ille-et-Vilainecredit-agricole.fr
Provides banking and financial services to over 530,000 clients with 119 branches and 1,500 employees in Ille-et-Vilaine. |
1,332 | |||
| 6 |
CENTRE HOSPITALIER GUILLAUME REGNIERch-guillaumeregnier.fr
Provides prevention, diagnosis, treatment, rehabilitation, social reintegration, research, and education in adult and child psychiatry sectors. |
679 | |||
| 7 |
Arkéa Banque Entreprises et Institutionnelsarkea-banque-ei.com
Specializes in providing tailored financial solutions, credit, and advisory services to businesses and institutional clients across various sectors. |
546 | |||
| 8 |
SDIS 35 -Service départemental d'incendie et de secours d'Ille-et-Vilainesapeurs-pompiers35.fr
The company is a public department in charge of emergency rescue missions, risk analysis, emergency response coordination, prevention, and firefighting |
394 | |||
| 9 |
Keolis Rennes Métropolekeolis-rennes-metropole.com
Manages and operates various urban transport networks in Rennes, including buses and metros, with a focus on daily passenger services. |
368 | |||
| 10 |
Fondation AUB Santéaub-sante.fr
Nonprofit healthcare organization specializing in chronic kidney disease treatment, home care services, and professional training in dialysis and patient support. |
353 | |||
| 11 |
Groupe Hospitalier Rance-Emeraudegh-re.fr
Healthcare network including hospitals in Saint-Malo, Dinan, and Cancale, providing emergency, surgery, medicine, obstetrics, and elderly care services. |
316 | |||
| 12 |
Clinique Mutualiste La Sagesseclinique-rennes.fr
A healthcare facility with 220 beds and over 550 professionals offering specialized care in mother-child, cancer surgeries, medical specialties, and chronic pain management |
268 | |||
| 13 |
Fondation Saint-Hélierpole-sthelier.fr
The company is a well-known actor in the healthcare and social services sector, providing a wide range of medical, rehabilitation, and support services |
260 | |||
| 14 |
CCI Ille-et-Vilainebretagne.cci.fr
Support and accelerate over 60,000 local businesses through project assistance, training, innovation, ecological transition, and managing key regional infrastructure. |
251 | |||
| 15 |
Assurance Maladie Ille-et-Vilaine (CPAM)ameli.fr
Private organization carrying out public service missions in health insurance in Ille-et-Vilaine, ensuring access to healthcare, promoting health preservation, and improving healthcare effectiveness |
241 | |||
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 |
Centre Hospitalier de Fougèresch-fougeres.fr
A hospital in Fougères offering a wide range of medical services, specialized consultations, and a care facility for the elderly |
199 | |||
| 17 |
ENGIE BiOZbioz-biomethane.com
Initiates, develops, finances, builds, and operates biomethane injection units for the French gas network, utilizing local organic matter. |
166 | |||
| 18 |
Ouest Biologieouest-biologie.com
Independent network of medical biology laboratories in Brittany and Normandy. Provides routine and specialized biological tests, supporting local healthcare needs for patients and professionals. |
155 | |||
| 19 |
SAINT-MALO AGGLOMÉRATION (Coopération intercommunale)stmalo-agglomeration.fr
Coordination of economic growth, tourism promotion, urban planning, social housing, transport, environmental protection, waste management, and sports facilities development. |
147 | |||
| 20 |
SPL EAU DU BASSIN RENNAISeaudubassinrennais.fr
Public local company managing water production and distribution for 470,000 residents across multiple municipalities in Rennes area with 140 employees. |
143 | |||
| 21 |
Hôpitaux Privés Rennais - Saint-Grégoire - Vivalto Santéchpsaintgregoire.com
A private hospital near Rennes offering a wide range of healthcare services with 500 beds, 800 employees, 270 physicians, and a large operating room facility |
143 | |||
| 22 | 137 | ||||
| 23 |
Keolis Armorkeolis-armor.com
A transportation company in Brittany, working with local authorities to operate public transit networks, passenger transport lines, and coach services |
110 | |||
| 24 |
Centre Hospitalier de Vitré Simone Veil
The Hospital Center of Vitré provides a wide range of healthcare services, including maternity, pediatrics, surgery, imaging, addiction center, and specialized consultations |
107 | |||
| 25 |
Hôpitaux Privés Rennais - Cesson-Sévigné - Vivalto Santéhopitalprivesevigne.com
Multidisciplinary healthcare facility in Cesson-Sévigné, Brittany, providing private hospitalization services as part of the Vivalto Santé group, a major national medical provider. |
105 | |||
| 26 |
TRANSPORTS GROUSSARD SAgroussard-logistics.com
Family-owned transport and logistics group specializing in small lot consolidation, temperature-controlled transport, and warehousing across Western France and Paris region. |
104 | |||
| 27 | 90 | ||||
| 28 |
Transports Oraintransports-orain.fr
Provide freight and passenger transport services with modern, diverse vehicle fleets meeting Euro 6 and safety standards for various travel needs. |
89 | |||
| 29 |
CLINIQUE DE L'ESPERANCEclinique-de-l-esperance.ramsaysante.fr
A healthcare facility established in 1948, part of Ramsay Santé group, located in downtown Rennes, offering medical services to patients |
84 | |||
| 30 |
RGO Mobilités
RGO Mobilités is a group of independent passenger transport companies offering school, regular, urban, occasional, and tourist transportation services in Western France |
72 | |||
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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.
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
- 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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- Critical infrastructure operators in Normandy 103
- Critical infrastructure operators in the Bouches-du-Rhône department 98
- Critical infrastructure operators in the Rhône department 94
- Critical infrastructure operators in Centre-Val de Loire 87
- Critical infrastructure operators in the Nord department 87
- Critical infrastructure operators in Bourgogne-Franche-Comté 76
- Critical infrastructure operators in the Haute-Garonne department 64
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- Critical infrastructure operators in the Loire-Atlantique department 59
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- Critical infrastructure operators in the Seine-Maritime department 46
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