This selection of critical infrastructure operators in Nantes primarily features large organizations in healthcare, banking, and public services. Notable entities include CHU de Nantes, a hospital specializing in research and international assistance, Nantes Métropole, focused on urban development and local news, and Credit Agricole Atlantique Vendee, a cooperative bank supporting regional economic growth. Semitan manages public transport in Nantes, overseeing network construction and mobility services.
A clear pattern among these companies is their strong local embeddedness, with many organizations like CIC Ouest and Crédit Mutuel Loire Atlantique Centre Ouest emphasizing their role in supporting regional projects and the local economy. The presence of several healthcare providers alongside key financial institutions and public administration bodies highlights a foundational service-oriented economic structure in the city.
| # | 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 |
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 | |||
| 4 | 1,476 | ||||
| 5 |
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 | |||
| 6 |
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 | |||
| 7 |
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 | |||
| 8 |
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 | |||
| 9 |
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 | |||
| 10 | 412 | ||||
| 11 |
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 | |||
| 12 |
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 | |||
| 13 |
Clinique Bretéchéelsan.care
A human-sized healthcare facility in Nantes city center, offering scheduled hospitalizations and maternity services to patients |
220 | |||
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. | |||||
| 14 |
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 | |||
| 15 |
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 | |||
| 16 |
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 | |||
| 17 |
Keolis Territoire Pays de la Loirekeolis-atlantique.com
A subsidiary of KEOLIS, specializing in interurban passenger transport and maintenance of nearly 500 coaches in western France |
114 | |||
| 18 |
HOSPI GRAND OUESThospigrandouest.fr
Groups health establishments, including clinics and rehabilitation centers, offering quality, safe, innovative, and benevolent care accessible to all. |
110 | |||
| 19 |
TER Pays de la Loire (SNCF VOYAGEURS)ter.sncf.com
With over 1100 employees and 560 daily trains, SNCF TER Pays de la Loire focuses on reducing CO2 emissions through increased TER services |
99 | |||
| 20 |
Compagnie Maritime Nantaise - MNcompagnie-maritime-nantaise.com
Specialized industrial maritime transport including ship design, construction, acquisition, management, and international operation under a strong financial and technical group. |
85 | |||
| 21 |
KEOLIS ATLANTIQUEkeolis-atlantique.com
Keolis Atlantique, a subsidiary of Keolis Group, specializes in passenger transport services in Pays de la Loire and southern Brittany, operating services and maintaining a large fleet of buses |
58 | |||
| 22 |
Ecovelo, le vélo en libre serviceecovelo.com
provides turnkey electric bike sharing services with robust French equipment, inclusive technology, and local economic integration for public mobility |
34 | |||
| 23 |
Gigalisgigalis.org
A mutualization tool offering innovative telecommunications services to public institutions, supporting new digital uses and fostering service development in Pays de la Loire |
29 | |||
| 24 |
Enerdigitenerdigit.fr
Electricity flexibility operator providing financial compensation for load shedding and developing large-scale battery storage projects to ensure grid security and energy transition. |
24 | |||
| 25 |
Transdev Pays de la Loiretransdev-paysdelaloire.com
A company in Pays de la Loire region provides customized mobility solutions for residents, focusing on safety, green energy, and connected mobility |
23 | |||
| 26 |
PNE Francepne-france.fr
Develops, builds, and operates wind and solar farms across metropolitan territory, integrating human and environmental stakes in renewable energy projects. |
20 | |||
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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.
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