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Top 30 public sector organisations in the Loire-Atlantique department

Tamtam tracks 80 public sector organisations headquartered in the Loire-Atlantique department. This list ranks the 30 largest by number of employees on LinkedIn, led by CHU de Nantes, Nantes Université and Nantes Métropole. Their median headcount is 326. Half of them were founded in 1969 or later. The most common headquarters are Nantes (21) and Saint-Nazaire (2).

🇫🇷 Loire-Atlantique30 companiesUpdated Nov 12, 2026

This selection of public sector organizations in Loire-Atlantique primarily features large institutions in healthcare, higher education, and government administration. Among them, CHU de Nantes is a major hospital group involved in research and international collaborations, Nantes Université focuses on higher education and innovation, and Nantes Métropole works on local development. Other notable entities include Semitan, managing urban transit in Nantes, and Centrale Nantes, an engineering school.

A clear pattern is the concentration of these significant public bodies within Nantes, which serves as the administrative and educational hub for the region. The organizations range from long-established institutions like CHU de Nantes (founded 1503) and Nantes Université (founded 1460) to more recently established entities like Nantes Métropole (founded 2004), indicating a mix of historical presence and modern administrative structures.

#CompanyIndustryHeadquarters EmployeesFounded
1
CHU de Nanteschu-nantes.fr

The company specializes in technical collaborations, continuing education, scientific research, and assistance for foreign patients in the field of international affairs

Hospitals and Health Care 🇫🇷 Nantes 5,305 1503
2
Nantes Universitéuniv-nantes.fr

Unites higher education, research, and innovation stakeholders to develop research excellence, especially for future health and industry, offering new training opportunities.

Higher Education 🇫🇷 Nantes 4,270 1460
3
Nantes Métropolelinktr.ee

This organization in Nantes and its metropolitan area aims to create a new development model, embracing solidarity, collaboration, creativity, and openness They provide updates on local news

Government Administration 🇫🇷 Nantes 2,524 2004
4
Région Pays de la Loirepaysdelaloire.fr

Regional government managing economic growth, cultural events, education, transport, innovation, and community services across diverse urban and rural areas.

Government Administration 🇫🇷 Nantes 1,457 n/a
5
Département de Loire-Atlantiqueloire-atlantique.fr

Provides local government administration and public services for the Loire-Atlantique region, managing community needs and regional development.

Government Administration 🇫🇷 Nantes 1,437 n/a
6
Semitansemitan.fr

A public-private entity managing public transport in Nantes, overseeing network construction, renovation, and coordination of all mobility services in the region

Urban Transit Services 🇫🇷 Nantes 727 1979
7
Centre Hospitalier de Saint-Nazairehopital-saintnazaire.fr

Public hospital providing extensive medical, surgical, emergency, mental health, elderly care, and preventive services across multiple regional sites.

Hospitals and Health Care 🇫🇷 Saint-Nazaire 669 1730
8
Centrale Nantesec-nantes.fr

Trains versatile engineers with high scientific, technical levels and strong managerial culture, integrating environmental, societal issues into global contexts.

Higher Education 🇫🇷 Nantes 600 1919
9
Oniris Nantesoniris-nantes.fr

Educates veterinarians, superior technicians, and engineers in animal health, public health, food sciences, and bioprocesses, actively supporting 'one medicine, one health'.

Higher Education 🇫🇷 Nantes 543 2010
10
Carsat Pays de la Loirecarsat-pl.fr

Regional social security organization managing retirement, social action, and occupational risk prevention for employees, retirees, and businesses in Pays de la Loire.

Government Administration 🇫🇷 Nantes 491 n/a
11
Réseau GRETA-CFA des Pays de la Loiregreta-cfa-paysdelaloire.fr

Group of public educational institutions pooling resources to offer adult continuing education tailored to local economic needs and equipment.

Professional Training and Coaching 🇫🇷 Nantes 394 n/a
12
CMA Pays de la Loireartisanatpaysdelaloire.fr

Represents, defends, and advises 92,360 establishments, supporting economic and social development, with a focus on training future craftspeople.

Government Administration 🇫🇷 Sainte-Luce-Sur-Loire 357 2015
13
Urssaf Pays de la Loireurssaf.fr

A company specializing in collecting social security contributions and family allowances on behalf of the government

Government Administration 🇫🇷 Nantes 342 n/a
14
Assurance Maladie de Loire-Atlantique (CPAM)cpam44.fr

The company supports over 1 million individuals with healthcare expenses, wellbeing preservation, care coordination, and enhanced protection in difficult situations

Government Administration 🇫🇷 Nantes 332 n/a
15
Faculté de Droit et des Sciences Politiques de Nantes Universitédroit.univ-nantes.fr

A leading component of Nantes University offering diverse legal and political science programs, research collaborations, international openness, and competent staff attracting growing student enrollment

Education Administration Programs 🇫🇷 Nantes 326 1967

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16
IUT de Nantesiutnantes.univ-nantes.fr

Higher education institution offering multidisciplinary technological degrees from Bac+3 to Bac+5 with strong industry ties and research focus.

Higher Education 🇫🇷 Carquefou 294 1967
17
Ville de Saint-Herblainsaint-herblain.fr

The company is located in Saint-Herblain, the second largest city in Nantes, with a population of 50,000 residents It is conveniently situated near major transportation hubs

Government Administration 🇫🇷 Saint-Herblain 283 n/a
18
Nantes Métropole Habitatnmh.fr

Public social housing organization managing diverse properties, providing homes for 50,000 tenants, supporting urban development and community engagement.

Real Estate 🇫🇷 Nantes 281 1913
19
IUT Saint-Nazaireiutsn.fr

Specializing in sustainability training to prepare individuals for a sustainable future

Higher Education 🇫🇷 Saint-Nazaire 273 1969
20
ensa Nantesnantes.archi.fr

A public institution offering architectural education and research, preparing students for the architect diploma, with international partnerships and a strategic alliance with two other schools

Higher Education 🇫🇷 Nantes 249 1969
21
Le Voyage à Nanteslevoyageanantes.fr

management of cultural sites and tourism policy implementation in Nantes Métropole, promoting art, culture, and local development projects.

Travel Arrangements 🇫🇷 Nantes 224 2011
22
IEMN-IAEiae.univ-nantes.fr

A leading institution in Nantes offering education in economics, finance, management, and professional development through internships, projects, and international experiences

Higher Education 🇫🇷 Nantes 221 1958
23
EPSYLANch-epsylan.fr

Provider of psychiatric care for all ages in northern Loire-Atlantique, managing various outpatient and inpatient facilities, offering diverse specialized treatments and therapeutic services

Hospitals and Health Care 🇫🇷 Blain 198 1960
24
Nantes Congress Centerlacite-nantes.fr

A public company in Nantes hosting over 300 events annually, offering diverse event spaces for national and international gatherings of 200 to 4000 participants

Events Services 🇫🇷 Nantes 194 1991
25
Samoasamoa-nantes.fr

The company oversees urban development and economic growth on Nantes island, operating within the Nantes Saint-Nazaire metropolitan area, focusing on creative industries

Architecture and Planning 🇫🇷 Nantes 193 2003
26
CapAtlantique La Baule-Guérande Agglocap-atlantique.fr

A local government organization managing 15 communes with 75,000 residents, focusing on preserving natural resources and serving the community in Loire-Atlantique and Morbihan

Government Administration 🇫🇷 La Baule-Escoublac 175 n/a
27
Direction régionale de l'environnement, de l'aménagement et du logement des Pays de la Loirepays-de-la-loire.developpement-durable.gouv.fr

Regional authority for environmental, planning, and housing in the Pays de la Loire region, overseeing policies and projects for sustainable development

Government Administration 🇫🇷 Nantes 172 2009
28
CA PORNIC AGGLO PAYS DE RETZpornicagglo.fr

Intercommunal structure uniting 15 municipalities in the Pays de Retz area for coordinated regional development and services.

Government Administration 🇫🇷 Pornic 159 2017
29
Nantes-Saint Nazaire Portport.fr

Public enterprise corporation managing port operations, linking land and sea, providing logistical platform, and contributing to regional economic development and employment.

Maritime Transportation 🇫🇷 Nantes 158 1966
30
Centre d’Incendie et de Secoursterre.defense.gouv.fr

A higher education institution located in Indre, France that focuses on fire and rescue services training and education

Higher Education 🇫🇷 Indre 154 n/a

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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 12, 2026.

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