# The 30 largest public sector organisations in the Ille-et-Vilaine department

Tamtam tracks 75 public sector organisations headquartered in the Ille-et-Vilaine department. This list ranks the 30 largest by number of employees on LinkedIn, led by Université de Rennes I, CHU de Rennes and Université Rennes 2. Their median headcount is 324. Half of them were founded in 1991 or later. The most common headquarters are Rennes (24) and Bruz (3).

This list contains public sector organizations in Ille-et-Vilaine, primarily based in Rennes. It features a mix of large institutions and specialized agencies. Key organizations include Université de Rennes I, a multidisciplinary university; CHU de Rennes, a large public hospital; Rennes Ville et Métropole, focusing on urban development and public services; and Région Bretagne, managing regional affairs like education and transport.

The data shows a strong concentration of headquarters in Rennes, indicating its role as the administrative and academic hub of the department. The organizations cover a wide range of public services, including higher education, healthcare, government administration, IT services, and social housing.

🇫🇷 Ille-et-Vilaine · 30 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Université de Rennes I](https://www.tamtam.ai/c/universite-de-rennes-i) (univ-rennes.fr)<br>Multidisciplinary university focusing on dynamic research, lifelong learning, societal challenges, and regional socio-economic and cultural development through partnerships. | Research Services | 🇫🇷 Rennes | 4,002 | 2022 |
| 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 | [Université Rennes 2](https://www.tamtam.ai/c/universite-rennes-2) (univ-rennes2.fr)<br>Higher education and research focused on arts, humanities, social sciences, languages, communication, psychology, education, sociology, geography, history, and sports. | Higher Education | 🇫🇷 Rennes | 2,286 |  |
| 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 | [Région Bretagne](https://www.tamtam.ai/c/region-bretagne) (bretagne.bzh)<br>Elected assembly managing Brittany's daily life and future through education, transport, economic development, planning, culture, sports, and environment. | Government Administration | 🇫🇷 Rennes | 1,529 |  |
| 6 | [EHESP - École des hautes études en santé publique](https://www.tamtam.ai/c/ehesp-ecole-des-hautes-etudes-en-sante-publique) (ehesp.fr)<br>A public institution offering a wide range of training programs in public health, with a strong focus on research and international partnerships | Higher Education | 🇫🇷 Rennes | 1,474 |  |
| 7 | [Département d'Ille-et-Vilaine](https://www.tamtam.ai/c/departement-d-ille-et-vilaine) (ille-et-vilaine.fr)<br>Management of social services, education, infrastructure, environment, and culture with a focus on solidarity and regional development. | Government Administration | 🇫🇷 Rennes | 994 |  |
| 8 | [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 |  |
| 9 | [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 |
| 10 | [INSA Rennes](https://www.tamtam.ai/c/insa-rennes) (insa-rennes.nous-recrutons.fr)<br>Provides five-year post-baccalaureate engineering education with strong research in information technologies and materials science in Brittany, France. | Higher Education | 🇫🇷 Rennes | 483 | 1966 |
| 11 | [Chambre d'agriculture de Bretagne](https://www.tamtam.ai/c/chambre-d-agriculture-de-bretagne) (bretagne.chambres-agriculture.fr)<br>Representing farmers, providing expertise to public services and local authorities, supporting farmers in business development and professional adaptation. | Farming | 🇫🇷 Rennes | 439 | 1942 |
| 12 | [Carsat Bretagne](https://www.tamtam.ai/c/carsat-bretagne) (carsat-bretagne.fr)<br>French social security body, retirement benefits, occupational risk prevention, support for vulnerable individuals, senior citizens' assistance. Regional economic player. | Government Administration | 🇫🇷 Rennes | 418 |  |
| 13 | [Faculté des Métiers](https://www.tamtam.ai/c/faculte-des-metiers) (fac-metiers.fr)<br>Offers vocational apprenticeship training across 12 sectors, certifying 64 professions with 108 diplomas for over 3,600 young individuals and 3,000 adults annually. | Professional Training and Coaching | 🇫🇷 Bruz | 395 | 1999 |
| 14 | [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 |  |
| 15 | [NEOTOA](https://www.tamtam.ai/c/neotoa) (neotoa.fr)<br>Management and construction of social and affordable housing in urban and rural Brittany, focusing on innovation, sustainability, and community support. | Real Estate | 🇫🇷 Rennes | 324 | 1921 |
| 16 | [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 |  |
| 17 | [Institut d'études politiques de Rennes](https://www.tamtam.ai/c/institut-d-etudes-politiques-de-rennes) (sciencespo-rennes.fr)<br>An institution of higher education providing multidisciplinary training to students for roles in public, private, and non-profit sectors, nationally and internationally | Higher Education | 🇫🇷 Rennes | 277 | 1991 |
| 18 | [Urssaf Bretagne](https://www.tamtam.ai/c/urssaf-bretagne) (bretagne.urssaf.fr)<br>A private organization with a public service mission, the company collects social contributions, promotes employment policies, and assists businesses with payment difficulties | Government Administration | 🇫🇷 Rennes | 259 |  |
| 19 | [Agence régionale de santé Bretagne](https://www.tamtam.ai/c/agence-regionale-de-sante-bretagne) (sante.fr)<br>The regional health agency in Brittany implements health policies, from prevention to medical care, in line with national guidelines and local input | Government Administration | 🇫🇷 Rennes | 257 | 2010 |
| 20 | [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 |  |
| 21 | [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 |
| 22 | [Chambre de Métiers et de l'Artisanat de Bretagne](https://www.tamtam.ai/c/chambre-de-metiers-et-de-l-artisanat-de-bretagne) (cma-bretagne.fr)<br>Support and advice for artisans and future artisans through training, business creation, development, and cessation formalities in Brittany. | Government Administration | 🇫🇷 Rennes | 227 |  |
| 23 | [DREAL Bretagne](https://www.tamtam.ai/c/dreal-bretagne) (bretagne.developpement-durable.gouv.fr)<br>The company works on environmental, housing, and development policies in Brittany region, promoting sustainable development through expertise, partnerships, and citizen engagement | Government Administration | 🇫🇷 Rennes | 224 | 2010 |
| 24 | [ENSAI](https://www.tamtam.ai/c/ensai) (ensai.fr)<br>Educates data scientists for private and public sectors, specializing in risk management, biostatistics, data engineering, and official statistics. | Higher Education | 🇫🇷 Bruz | 222 | 1994 |
| 25 | [Archipel habitat](https://www.tamtam.ai/c/archipel-habitat) (archipel-habitat.fr)<br>public housing office managing 17,000 social housing units, serving 30,000 residents, ensuring quality service and property care | Real Estate | 🇫🇷 Rennes | 202 | 1919 |
| 26 | [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 |  |
| 27 | [CDG 35 (Centre de Gestion de la Fonction Publique Territoriale d'Ille et Vilaine)](https://www.tamtam.ai/c/cdg-35-centre-de-gestion-de-la-fonction-publique-territoriale-d-ille-et-vilaine) (cdg35.fr)<br>Recruitment and training of job seekers, students, and employees to meet temporary needs of local public authorities with professional development. | Human Resources Services | 🇫🇷 Thorigné-Fouillard | 191 |  |
| 28 | [GRETA-CFA Est-Bretagne](https://www.tamtam.ai/c/greta-cfa-est-bretagne) (linktr.ee)<br>A vocational training center in Brittany offering personalized support and a variety of courses in different sectors for professionals, job seekers, and youth | Professional Training and Coaching | 🇫🇷 Rennes | 182 | 1974 |
| 29 | [Caf d'Ille-et-Vilaine](https://www.tamtam.ai/c/caf-d-ille-et-vilaine) (caf.fr)<br>A private company providing public services to support families, fight against social inequalities, and promote social cohesion in Ille-et-Vilaine, France | Government Administration | 🇫🇷 Rennes | 171 | 1945 |
| 30 | [École normale supérieure de Rennes](https://www.tamtam.ai/c/ecole-normale-superieure-de-rennes) (ens-rennes.fr)<br>The company is a public institution focused on training high-level scientific leaders for public service careers through interdisciplinary education and international collaborations | Higher Education | 🇫🇷 Bruz | 165 | 1994 |

## 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 13, 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)
- [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)
- [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

- [Public sector organisations in France](https://www.tamtam.ai/l/public-sector-organisations-france) (4,003)
- [Public sector organisations in Île-de-France](https://www.tamtam.ai/l/public-sector-organisations-ile-de-france) (989)
- [Public sector organisations in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/public-sector-organisations-auvergne-rhone-alpes) (451)
- [Public sector organisations in Grand Est](https://www.tamtam.ai/l/public-sector-organisations-grand-est) (430)
- [Public sector organisations in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/public-sector-organisations-provence-alpes-cote-dazur) (384)
- [Public sector organisations in Occitanie](https://www.tamtam.ai/l/public-sector-organisations-occitanie) (316)
- [Public sector organisations in Nouvelle-Aquitaine](https://www.tamtam.ai/l/public-sector-organisations-nouvelle-aquitaine) (310)
- [Public sector organisations in Hauts-de-France](https://www.tamtam.ai/l/public-sector-organisations-hauts-de-france) (261)
- [Public sector organisations in Pays de la Loire](https://www.tamtam.ai/l/public-sector-organisations-pays-de-la-loire) (185)
- [Public sector organisations in the Bouches-du-Rhône department](https://www.tamtam.ai/l/public-sector-organisations-bouches-du-rhone) (183)
- [Public sector organisations in Normandy](https://www.tamtam.ai/l/public-sector-organisations-normandy) (166)
- [Public sector organisations in Brittany](https://www.tamtam.ai/l/public-sector-organisations-brittany) (165)
- [Public sector organisations in the Nord department](https://www.tamtam.ai/l/public-sector-organisations-nord) (135)
- [Public sector organisations in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/public-sector-organisations-bourgogne-franche-comte) (130)
- [Public sector organisations in Centre-Val de Loire](https://www.tamtam.ai/l/public-sector-organisations-centre-val-de-loire) (120)
- [Public sector organisations in the Rhône department](https://www.tamtam.ai/l/public-sector-organisations-rhone) (120)
- [Public sector organisations in the Haute-Garonne department](https://www.tamtam.ai/l/public-sector-organisations-haute-garonne) (110)
- [Public sector organisations in the Gironde department](https://www.tamtam.ai/l/public-sector-organisations-gironde) (109)
- [Public sector organisations in the Hauts-de-Seine department](https://www.tamtam.ai/l/public-sector-organisations-hauts-de-seine) (95)
- [Public sector organisations in the Seine-Saint-Denis department](https://www.tamtam.ai/l/public-sector-organisations-seine-saint-denis) (91)
- [Public sector organisations in the Isère department](https://www.tamtam.ai/l/public-sector-organisations-isere) (80)
- [Public sector organisations in Paris](https://www.tamtam.ai/l/public-sector-organisations-paris) (457)
- [Public sector organisations in Marseille](https://www.tamtam.ai/l/public-sector-organisations-marseille) (103)
- [Public sector organisations in Toulouse](https://www.tamtam.ai/l/public-sector-organisations-toulouse) (83)

## The same list elsewhere

- [Public sector organisations in the world](https://www.tamtam.ai/l/public-sector-organisations-in-the-world) (18,492)
- [Public sector organisations in Europe](https://www.tamtam.ai/l/public-sector-organisations-in-europe) (8,565)

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Source: https://www.tamtam.ai/l/public-sector-organisations-ille-et-vilaine