# Top 30 critical infrastructure operators in the Ille-et-Vilaine department

Tamtam tracks 45 critical infrastructure operators headquartered in the Ille-et-Vilaine department. This list ranks the 30 largest by number of employees on LinkedIn, led by Vivalto Santé, CHU de Rennes and Banque Populaire Grand Ouest. Their median headcount is 241. The most common headquarters are Rennes (13) and Saint-Grégoire (5).

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.

🇫🇷 Ille-et-Vilaine · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Vivalto Santé](https://www.tamtam.ai/c/vivalto-sante) (vivalto-sante.fr)<br>Operates a network of healthcare facilities across Europe, providing comprehensive patient care. Engages in medical partnerships and sustainable practices. | Hospitals and Health Care | 🇫🇷 Saint-Grégoire | 4,612 | 2009 |
| 2 | [CHU de Rennes](https://www.tamtam.ai/c/chu-de-rennes) (chu-rennes.fr)<br>Large French public hospital offering extensive medical, surgical, and obstetrical services, advanced diagnostics, research, and medical training to the population. | Hospitals and Health Care | 🇫🇷 Rennes | 3,470 |  |
| 3 | [Banque Populaire Grand Ouest](https://www.tamtam.ai/c/banque-populaire-grand-ouest) (banquepopulaire.fr)<br>Cooperative regional bank supporting entrepreneurs, artisans, and businesses across seven departments, fostering economic development through financial and human expertise. | Banking | 🇫🇷 Saint-Grégoire | 2,642 |  |
| 4 | [Rennes Ville et Métropole](https://www.tamtam.ai/c/rennes-ville-et-metropole) (rennes.fr)<br>Fosters economic, urban development, attracting talent and students. Provides diverse public services through 5300 agents, focusing on quality of life and professional growth. | Government Administration | 🇫🇷 Rennes | 1,828 |  |
| 5 | [Crédit Agricole d'Ille-et-Vilaine](https://www.tamtam.ai/c/credit-agricole-d-ille-et-vilaine) (credit-agricole.fr)<br>Provides banking and financial services to over 530,000 clients with 119 branches and 1,500 employees in Ille-et-Vilaine. | Banking | 🇫🇷 Saint-Jacques-de-la-Lande | 1,332 |  |
| 6 | [CENTRE HOSPITALIER GUILLAUME REGNIER](https://www.tamtam.ai/c/centre-hospitalier-guillaume-regnier) (ch-guillaumeregnier.fr)<br>Provides prevention, diagnosis, treatment, rehabilitation, social reintegration, research, and education in adult and child psychiatry sectors. | Hospitals and Health Care | 🇫🇷 Rennes | 679 |  |
| 7 | [Arkéa Banque Entreprises et Institutionnels](https://www.tamtam.ai/c/arkea-banque-entreprises-et-institutionnels) (arkea-banque-ei.com)<br>Specializes in providing tailored financial solutions, credit, and advisory services to businesses and institutional clients across various sectors. | Banking | 🇫🇷 Saint-Grégoire | 546 | 1986 |
| 8 | [SDIS 35 -Service départemental d'incendie et de secours d'Ille-et-Vilaine](https://www.tamtam.ai/c/sdis-35-service-departemental-d-incendie-et-de-secours-d-ille-et-vilaine) (sapeurs-pompiers35.fr)<br>The company is a public department in charge of emergency rescue missions, risk analysis, emergency response coordination, prevention, and firefighting | Public Safety | 🇫🇷 Rennes | 394 |  |
| 9 | [Keolis Rennes Métropole](https://www.tamtam.ai/c/keolis-rennes-metropole) (keolis-rennes-metropole.com)<br>Manages and operates various urban transport networks in Rennes, including buses and metros, with a focus on daily passenger services. | Urban Transit Services | 🇫🇷 Rennes | 368 | 1990 |
| 10 | [Fondation AUB Santé](https://www.tamtam.ai/c/fondation-aub-sante) (aub-sante.fr)<br>Nonprofit healthcare organization specializing in chronic kidney disease treatment, home care services, and professional training in dialysis and patient support. | Hospitals and Health Care | 🇫🇷 Pacé | 353 | 1971 |
| 11 | [Groupe Hospitalier Rance-Emeraude](https://www.tamtam.ai/c/groupe-hospitalier-rance-emeraude) (gh-re.fr)<br>Healthcare network including hospitals in Saint-Malo, Dinan, and Cancale, providing emergency, surgery, medicine, obstetrics, and elderly care services. | Hospitals and Health Care | 🇫🇷 Saint-Malo | 316 |  |
| 12 | [Clinique Mutualiste La Sagesse](https://www.tamtam.ai/c/clinique-mutualiste-la-sagesse) (clinique-rennes.fr)<br>A healthcare facility with 220 beds and over 550 professionals offering specialized care in mother-child, cancer surgeries, medical specialties, and chronic pain management | Hospitals and Health Care | 🇫🇷 Rennes | 268 |  |
| 13 | [Fondation Saint-Hélier](https://www.tamtam.ai/c/fondation-saint-helier) (pole-sthelier.fr)<br>The company is a well-known actor in the healthcare and social services sector, providing a wide range of medical, rehabilitation, and support services | Hospitals and Health Care | 🇫🇷 Rennes | 260 |  |
| 14 | [CCI Ille-et-Vilaine](https://www.tamtam.ai/c/cci-ille-et-vilaine) (bretagne.cci.fr)<br>Support and accelerate over 60,000 local businesses through project assistance, training, innovation, ecological transition, and managing key regional infrastructure. | Government Administration | 🇫🇷 Rennes | 251 |  |
| 15 | [Assurance Maladie Ille-et-Vilaine (CPAM)](https://www.tamtam.ai/c/assurance-maladie-ille-et-vilaine-cpam) (ameli.fr)<br>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 | Government Administration | 🇫🇷 Rennes | 241 | 1945 |
| 16 | [Centre Hospitalier de Fougères](https://www.tamtam.ai/c/centre-hospitalier-de-fougeres) (ch-fougeres.fr)<br>A hospital in Fougères offering a wide range of medical services, specialized consultations, and a care facility for the elderly | Hospitals and Health Care | 🇫🇷 Fougères | 199 |  |
| 17 | [ENGIE BiOZ](https://www.tamtam.ai/c/engie-bioz) (bioz-biomethane.com)<br>Initiates, develops, finances, builds, and operates biomethane injection units for the French gas network, utilizing local organic matter. | Renewable Energy Power Generation | 🇫🇷 Saint-Grégoire | 166 |  |
| 18 | [Ouest Biologie](https://www.tamtam.ai/c/ouest-biologie) (ouest-biologie.com)<br>Independent network of medical biology laboratories in Brittany and Normandy. Provides routine and specialized biological tests, supporting local healthcare needs for patients and professionals. | Medical Practices | 🇫🇷 Tinténiac | 155 | 2020 |
| 19 | [SAINT-MALO AGGLOMÉRATION (Coopération intercommunale)](https://www.tamtam.ai/c/saint-malo-agglomeration-cooperation-intercommunale) (stmalo-agglomeration.fr)<br>Coordination of economic growth, tourism promotion, urban planning, social housing, transport, environmental protection, waste management, and sports facilities development. | Government Relations Services | 🇫🇷 Cancale | 147 | 2001 |
| 20 | [SPL EAU DU BASSIN RENNAIS](https://www.tamtam.ai/c/spl-eau-du-bassin-rennais) (eaudubassinrennais.fr)<br>Public local company managing water production and distribution for 470,000 residents across multiple municipalities in Rennes area with 140 employees. | Water, Waste, Steam, and Air Conditioning Services | 🇫🇷 Rennes | 143 | 2013 |
| 21 | [Hôpitaux Privés Rennais - Saint-Grégoire - Vivalto Santé](https://www.tamtam.ai/c/hopitaux-prives-rennais-saint-gregoire-vivalto-sante) (chpsaintgregoire.com)<br>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 | Hospitals and Health Care | 🇫🇷 Saint-Grégoire | 143 | 2009 |
| 22 | [HAD35](https://www.tamtam.ai/c/had35) (had35.fr)<br>Provides home-based medical and paramedical care including complex treatments, pediatric, palliative, post-surgery, and continuous coordinated patient support. | Home Health Care Services | 🇫🇷 Rennes | 137 | 2004 |
| 23 | [Keolis Armor](https://www.tamtam.ai/c/keolis-armor) (keolis-armor.com)<br>A transportation company in Brittany, working with local authorities to operate public transit networks, passenger transport lines, and coach services | Truck Transportation | 🇫🇷 Chantepie | 110 | 1932 |
| 24 | [Centre Hospitalier de Vitré Simone Veil](https://www.tamtam.ai/c/centre-hospitalier-de-vitre-simone-veil)<br>The Hospital Center of Vitré provides a wide range of healthcare services, including maternity, pediatrics, surgery, imaging, addiction center, and specialized consultations | Hospitals and Health Care | 🇫🇷 Vitré | 107 |  |
| 25 | [Hôpitaux Privés Rennais - Cesson-Sévigné - Vivalto Santé](https://www.tamtam.ai/c/hopitaux-prives-rennais-cesson-sevigne-vivalto-sante) (hopitalprivesevigne.com)<br>Multidisciplinary healthcare facility in Cesson-Sévigné, Brittany, providing private hospitalization services as part of the Vivalto Santé group, a major national medical provider. | Hospitals and Health Care | 🇫🇷 Cesson-Sévigné | 105 | 1979 |
| 26 | [TRANSPORTS GROUSSARD SA](https://www.tamtam.ai/c/transports-groussard-sa) (groussard-logistics.com)<br>Family-owned transport and logistics group specializing in small lot consolidation, temperature-controlled transport, and warehousing across Western France and Paris region. | Truck Transportation | 🇫🇷 Saint-Sauveur-des-Landes | 104 |  |
| 27 | [UNIXO](https://www.tamtam.ai/c/unixo) (unixo.fr)<br>UNIXO specializes in providing innovative and personalized IT solutions for SMEs, ETIs & local authorities, including telecommunications integration, IT management, and broadband internet services | Telecommunications | 🇫🇷 Rennes | 90 |  |
| 28 | [Transports Orain](https://www.tamtam.ai/c/transports-orain) (transports-orain.fr)<br>Provide freight and passenger transport services with modern, diverse vehicle fleets meeting Euro 6 and safety standards for various travel needs. | Truck Transportation | 🇫🇷 Guipry-Messac | 89 | 1938 |
| 29 | [CLINIQUE DE L'ESPERANCE](https://www.tamtam.ai/c/clinique-de-l-esperance) (clinique-de-l-esperance.ramsaysante.fr)<br>A healthcare facility established in 1948, part of Ramsay Santé group, located in downtown Rennes, offering medical services to patients | Hospitals and Health Care | 🇫🇷 Rennes | 84 | 1948 |
| 30 | [RGO Mobilités](https://www.tamtam.ai/c/rgo-mobilites)<br>RGO Mobilités is a group of independent passenger transport companies offering school, regular, urban, occasional, and tourist transportation services in Western France | Ground Passenger Transportation | 🇫🇷 Saint-Jacques-de-la-Lande | 72 |  |

## 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](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)
- [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)
- [Legal Services companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/legal-services-companies-ille-et-vilaine) (41)

## The same list elsewhere in France

- [Critical infrastructure operators in France](https://www.tamtam.ai/l/critical-infrastructure-operators-france) (2,721)
- [Critical infrastructure operators in Île-de-France](https://www.tamtam.ai/l/critical-infrastructure-operators-ile-de-france) (780)
- [Critical infrastructure operators in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/critical-infrastructure-operators-auvergne-rhone-alpes) (299)
- [Critical infrastructure operators in Grand Est](https://www.tamtam.ai/l/critical-infrastructure-operators-grand-est) (257)
- [Critical infrastructure operators in Occitanie](https://www.tamtam.ai/l/critical-infrastructure-operators-occitanie) (216)
- [Critical infrastructure operators in Nouvelle-Aquitaine](https://www.tamtam.ai/l/critical-infrastructure-operators-nouvelle-aquitaine) (209)
- [Critical infrastructure operators in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/critical-infrastructure-operators-provence-alpes-cote-dazur) (200)
- [Critical infrastructure operators in Hauts-de-France](https://www.tamtam.ai/l/critical-infrastructure-operators-hauts-de-france) (174)
- [Critical infrastructure operators in the Hauts-de-Seine department](https://www.tamtam.ai/l/critical-infrastructure-operators-hauts-de-seine) (169)
- [Critical infrastructure operators in Pays de la Loire](https://www.tamtam.ai/l/critical-infrastructure-operators-pays-de-la-loire) (127)
- [Critical infrastructure operators in Brittany](https://www.tamtam.ai/l/critical-infrastructure-operators-brittany) (120)
- [Critical infrastructure operators in Normandy](https://www.tamtam.ai/l/critical-infrastructure-operators-normandy) (103)
- [Critical infrastructure operators in the Bouches-du-Rhône department](https://www.tamtam.ai/l/critical-infrastructure-operators-bouches-du-rhone) (98)
- [Critical infrastructure operators in the Rhône department](https://www.tamtam.ai/l/critical-infrastructure-operators-rhone) (94)
- [Critical infrastructure operators in Centre-Val de Loire](https://www.tamtam.ai/l/critical-infrastructure-operators-centre-val-de-loire) (87)
- [Critical infrastructure operators in the Nord department](https://www.tamtam.ai/l/critical-infrastructure-operators-nord) (87)
- [Critical infrastructure operators in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/critical-infrastructure-operators-bourgogne-franche-comte) (76)
- [Critical infrastructure operators in the Haute-Garonne department](https://www.tamtam.ai/l/critical-infrastructure-operators-haute-garonne) (64)
- [Critical infrastructure operators in the Gironde department](https://www.tamtam.ai/l/critical-infrastructure-operators-gironde) (63)
- [Critical infrastructure operators in the Loire-Atlantique department](https://www.tamtam.ai/l/critical-infrastructure-operators-loire-atlantique) (59)
- [Critical infrastructure operators in the Hérault department](https://www.tamtam.ai/l/critical-infrastructure-operators-herault) (57)
- [Critical infrastructure operators in the Seine-Saint-Denis department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-saint-denis) (53)
- [Critical infrastructure operators in the Seine-Maritime department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-maritime) (46)
- [Critical infrastructure operators in Paris](https://www.tamtam.ai/l/critical-infrastructure-operators-paris) (331)

---

Source: https://www.tamtam.ai/l/critical-infrastructure-operators-ille-et-vilaine