This selection of critical infrastructure operators in Loire-Atlantique highlights the region's strong focus on public services and essential industries. Major employers include CHU de Nantes, specializing in healthcare and research; Nantes Métropole, focusing on urban development and local news; and Caisse d'Epargne Bretagne Pays de Loire, a regional mutualist bank. Other significant entities are LNA Santé, a family-owned healthcare provider, and HOP!, a regional airline.
The data shows a notable concentration of headquarters in Nantes, indicating the city's role as a central hub for critical infrastructure management in the department. Healthcare and banking are particularly prominent sectors among these large operators, reflecting key areas of regional economic and social activity.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 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 |
5,305 | |||
| 2 |
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 |
2,524 | |||
| 3 |
Caisse d'Epargne Bretagne Pays de Loirecaisse-epargne.fr
Regional mutualist bank with 420 agencies, serving individuals and professionals, supporting local economy through business centers and specialized subsidiaries. |
2,428 | |||
| 4 |
LNA Santélna-sante.com
Family-owned healthcare provider based in Nantes since 1990, offering care and support for individuals with fragility or loss of autonomy through various facilities |
2,080 | |||
| 5 |
Credit Agricole Atlantique Vendeecredit-agricole.fr
A cooperative bank supporting local economic development in Loire-Atlantique and Vendée, focusing on human-centered long-term vision with a successful dynamic |
1,851 | |||
| 6 |
MAISON DES AGES ET DES CULTURESmdac.fr
Non-profit association based in Legé, France, focused on promoting intergenerational and intercultural exchanges and activities within the community |
1,530 | |||
| 7 | 1,476 | ||||
| 8 | 1,326 | ||||
| 9 |
Semitansemitan.fr
A public-private entity managing public transport in Nantes, overseeing network construction, renovation, and coordination of all mobility services in the region |
727 | |||
| 10 |
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. |
669 | |||
| 11 |
L'Hôpital Privé du Confluent - Vivalto Santéhopitalpriveconfluent.vivalto-sante.com
It offers consultation and hospitalization in short-stay medicine, surgery, oncology, and cardiology, with 24/7 emergency services, employing 200 practitioners and 1,100 employees. |
644 | |||
| 12 |
Crédit Mutuel Loire Atlantique Centre Ouestcreditmutuel.fr
Offers banking, insurance, mobile, automotive, and real estate services to individuals, businesses, and associations, supporting local projects and economy. |
525 | |||
| 13 |
Clinique Jules Vernecliniquejulesverne.fr
Clinique Jules Verne is a medical facility offering a wide range of specialties with a focus on quality and personalized care in a modern environment |
452 | |||
| 14 |
VYV 3 Pays de la Loirepdl.vyv3.fr
A non-profit mutualist organization in Pays de la Loire region managing healthcare services for all ages, focusing on quality, affordability, and accessibility |
434 | |||
| 15 |
EBTransebtrans.com
A European leader in transport and logistics of sensitive materials, offering tailored services in over 14 countries with a focus on respect, safety, and responsibility |
422 | |||
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 | 412 | ||||
| 17 |
Air France HOPwwws.airfrance.fr
Regional airline subsidiary operating daily flights to over one hundred French and European destinations, formed by merging three regional carriers. |
408 | |||
| 18 | 380 | ||||
| 19 |
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 |
332 | |||
| 20 |
Santé Atlantiquesanteatlantique.fr
Santé Atlantique provides comprehensive and excellent healthcare services, offering a wide range of medical specialties with 1,500 healthcare professionals |
319 | |||
| 21 |
Clinique Bretéchéelsan.care
A human-sized healthcare facility in Nantes city center, offering scheduled hospitalizations and maternity services to patients |
220 | |||
| 22 |
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 |
198 | |||
| 23 |
LABORATOIRE SYNLAB BIOLIANCEbioliance.fr
Network of medical laboratories providing prevention, diagnostic, and follow-up biological analyses across Nantes metropolitan area and surrounding regions. |
193 | |||
| 24 |
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 |
175 | |||
| 25 |
V.Ships Francevgrouplimited.com
Established in 2001, specializing in ship management for the tanker, bulker, and gas sectors, providing technical, risk management, procurement, and financial services |
171 | |||
| 26 |
Clinique Mutualiste de L'Estuaireclinique-mutualiste-estuaire.fr
A 240-bed facility with over 450 professionals offering comprehensive medical care, including surgery, oncology, medicine, and specialized services for obese patients |
166 | |||
| 27 |
Knutsen LNG Franceknutsenoas.com
A subsidiary of Knutsen OAS Shipping managing LNG carriers sailing under the RIF Flag with French officers from a French office |
165 | |||
| 28 |
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. |
158 | |||
| 29 |
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 |
154 | |||
| 30 |
HAD - Hôpital à Domicile Nantes & régionhad-nantesetregion.fr
L’HAD Nantes & région provides medical and paramedical care at home to avoid hospitalization, with a focus on patient-centered and humanistic approach |
131 | |||
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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 Loire-Atlantique department
- The largest companies in the Loire-Atlantique department 2,046
- Companies with in-house R&D in the Loire-Atlantique department 207
- Retail chains in the Loire-Atlantique department 163
- Multinational companies in the Loire-Atlantique department 159
- Professional services firms in the Loire-Atlantique department 158
- Software Development companies in the Loire-Atlantique department 137
- SaaS companies in the Loire-Atlantique department 135
- IT services companies in the Loire-Atlantique department 130
- Manufacturers in the Loire-Atlantique department 125
- IT Services and IT Consulting companies in the Loire-Atlantique department 110
- Consulting firms in the Loire-Atlantique department 94
- Distributors and wholesalers in the Loire-Atlantique department 94
- Hardware manufacturers in the Loire-Atlantique department 86
- Business Consulting and Services companies in the Loire-Atlantique department 83
- Public sector organisations in the Loire-Atlantique department 82
- Family-owned companies in the Loire-Atlantique department 71
- Education providers in the Loire-Atlantique department 68
- Real Estate companies in the Loire-Atlantique department 67
- Financial services firms in the Loire-Atlantique department 65
- Law Practice companies in the Loire-Atlantique department 62
- Retail companies in the Loire-Atlantique department 61
- Subscription businesses in the Loire-Atlantique department 61
- Events Services companies in the Loire-Atlantique department 58
- Construction companies in the Loire-Atlantique department 57
The same list elsewhere in France
- Critical infrastructure operators in France 2,721
- Critical infrastructure operators in Île-de-France 780
- Critical infrastructure operators in Auvergne-Rhône-Alpes 299
- Critical infrastructure operators in Grand Est 257
- Critical infrastructure operators in Occitanie 216
- Critical infrastructure operators in Nouvelle-Aquitaine 209
- Critical infrastructure operators in Provence-Alpes-Côte d'Azur 200
- Critical infrastructure operators in Hauts-de-France 174
- Critical infrastructure operators in the Hauts-de-Seine department 169
- Critical infrastructure operators in Pays de la Loire 127
- Critical infrastructure operators in Brittany 120
- 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
- Critical infrastructure operators in the Gironde department 63
- Critical infrastructure operators in the Hérault department 57
- Critical infrastructure operators in the Seine-Saint-Denis department 53
- Critical infrastructure operators in the Seine-Maritime department 46
- Critical infrastructure operators in the Ille-et-Vilaine department 45
- Critical infrastructure operators in Paris 331