# Critical infrastructure operators headquartered in Nantes

Tamtam tracks 26 critical infrastructure operators headquartered in Nantes. This list ranks all of them by number of employees on LinkedIn, led by CHU de Nantes, Nantes Métropole and Credit Agricole Atlantique Vendee. Their median headcount is 220. Half of them were founded in 2003 or later.

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.

🇫🇷 Nantes · 26 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [CHU de Nantes](https://www.tamtam.ai/c/chu-de-nantes) (chu-nantes.fr)<br>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 Métropole](https://www.tamtam.ai/c/nantes-metropole) (linktr.ee)<br>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 |
| 3 | [Credit Agricole Atlantique Vendee](https://www.tamtam.ai/c/credit-agricole-atlantique-vendee) (credit-agricole.fr)<br>A cooperative bank supporting local economic development in Loire-Atlantique and Vendée, focusing on human-centered long-term vision with a successful dynamic | Banking | 🇫🇷 Nantes | 1,851 |  |
| 4 | [CIC Ouest](https://www.tamtam.ai/c/cic-ouest) (cic.fr)<br>A solidary and responsible bank in Western France, supporting regional projects for a more just and sustainable society Emphasizes innovation, proximity, and employee satisfaction | Banking | 🇫🇷 Nantes | 1,476 |  |
| 5 | [Semitan](https://www.tamtam.ai/c/semitan) (semitan.fr)<br>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 |
| 6 | [L'Hôpital Privé du Confluent - Vivalto Santé](https://www.tamtam.ai/c/l-hopital-prive-du-confluent-vivalto-sante) (hopitalpriveconfluent.vivalto-sante.com)<br>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. | Hospitals and Health Care | 🇫🇷 Nantes | 644 | 2003 |
| 7 | [Crédit Mutuel Loire Atlantique Centre Ouest](https://www.tamtam.ai/c/credit-mutuel-loire-atlantique-centre-ouest) (creditmutuel.fr)<br>Offers banking, insurance, mobile, automotive, and real estate services to individuals, businesses, and associations, supporting local projects and economy. | Banking | 🇫🇷 Nantes | 525 |  |
| 8 | [Clinique Jules Verne](https://www.tamtam.ai/c/clinique-jules-verne) (cliniquejulesverne.fr)<br>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 | Hospitals and Health Care | 🇫🇷 Nantes | 452 |  |
| 9 | [VYV 3 Pays de la Loire](https://www.tamtam.ai/c/vyv-3-pays-de-la-loire) (pdl.vyv3.fr)<br>A non-profit mutualist organization in Pays de la Loire region managing healthcare services for all ages, focusing on quality, affordability, and accessibility | Hospitals and Health Care | 🇫🇷 Nantes | 434 | 2019 |
| 10 | [Edeis](https://www.tamtam.ai/c/edeis) (edeis.com)<br>Specializing in engineering, operation, and construction solutions for the future, this company aims to become a leader in construction services and technical management | Engineering Services | 🇫🇷 Nantes | 412 | 2016 |
| 11 | [Air France HOP](https://www.tamtam.ai/c/air-france-hop) (wwws.airfrance.fr)<br>Regional airline subsidiary operating daily flights to over one hundred French and European destinations, formed by merging three regional carriers. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Nantes | 408 | 2013 |
| 12 | [Assurance Maladie de Loire-Atlantique (CPAM)](https://www.tamtam.ai/c/assurance-maladie-de-loire-atlantique-cpam) (cpam44.fr)<br>The company supports over 1 million individuals with healthcare expenses, wellbeing preservation, care coordination, and enhanced protection in difficult situations | Government Administration | 🇫🇷 Nantes | 332 |  |
| 13 | [Clinique Bretéché](https://www.tamtam.ai/c/clinique-breteche) (elsan.care)<br>A human-sized healthcare facility in Nantes city center, offering scheduled hospitalizations and maternity services to patients | Hospitals and Health Care | 🇫🇷 Nantes | 220 | 1938 |
| 14 | [V.Ships France](https://www.tamtam.ai/c/v-ships-france) (vgrouplimited.com)<br>Established in 2001, specializing in ship management for the tanker, bulker, and gas sectors, providing technical, risk management, procurement, and financial services | Maritime Transportation | 🇫🇷 Nantes | 171 | 2001 |
| 15 | [Knutsen LNG France](https://www.tamtam.ai/c/knutsen-lng-france) (knutsenoas.com)<br>A subsidiary of Knutsen OAS Shipping managing LNG carriers sailing under the RIF Flag with French officers from a French office | Maritime Transportation | 🇫🇷 Nantes | 165 |  |
| 16 | [Nantes-Saint Nazaire Port](https://www.tamtam.ai/c/nantes-saint-nazaire-port) (port.fr)<br>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 |
| 17 | [Keolis Territoire Pays de la Loire](https://www.tamtam.ai/c/keolis-territoire-pays-de-la-loire) (keolis-atlantique.com)<br>A subsidiary of KEOLIS, specializing in interurban passenger transport and maintenance of nearly 500 coaches in western France | Ground Passenger Transportation | 🇫🇷 Nantes | 114 |  |
| 18 | [HOSPI GRAND OUEST](https://www.tamtam.ai/c/hospi-grand-ouest) (hospigrandouest.fr)<br>Groups health establishments, including clinics and rehabilitation centers, offering quality, safe, innovative, and benevolent care accessible to all. | Hospitals and Health Care | 🇫🇷 Nantes | 110 | 2010 |
| 19 | [TER Pays de la Loire (SNCF VOYAGEURS)](https://www.tamtam.ai/c/ter-pays-de-la-loire-sncf-voyageurs) (ter.sncf.com)<br>With over 1100 employees and 560 daily trains, SNCF TER Pays de la Loire focuses on reducing CO2 emissions through increased TER services | Rail Transportation | 🇫🇷 Nantes | 99 |  |
| 20 | [Compagnie Maritime Nantaise - MN](https://www.tamtam.ai/c/compagnie-maritime-nantaise-mn) (compagnie-maritime-nantaise.com)<br>Specialized industrial maritime transport including ship design, construction, acquisition, management, and international operation under a strong financial and technical group. | Maritime Transportation | 🇫🇷 Nantes | 85 |  |
| 21 | [KEOLIS ATLANTIQUE](https://www.tamtam.ai/c/keolis-atlantique) (keolis-atlantique.com)<br>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 | Truck Transportation | 🇫🇷 Nantes | 58 | 1975 |
| 22 | [Ecovelo, le vélo en libre service](https://www.tamtam.ai/c/ecovelo-le-velo-en-libre-service) (ecovelo.com)<br>provides turnkey electric bike sharing services with robust French equipment, inclusive technology, and local economic integration for public mobility | Urban Transit Services | 🇫🇷 Nantes | 34 | 2013 |
| 23 | [Gigalis](https://www.tamtam.ai/c/gigalis) (gigalis.org)<br>A mutualization tool offering innovative telecommunications services to public institutions, supporting new digital uses and fostering service development in Pays de la Loire | IT Services and IT Consulting | 🇫🇷 Nantes | 29 | 2000 |
| 24 | [Enerdigit](https://www.tamtam.ai/c/enerdigit) (enerdigit.fr)<br>Electricity flexibility operator providing financial compensation for load shedding and developing large-scale battery storage projects to ensure grid security and energy transition. | Services for Renewable Energy | 🇫🇷 Nantes | 24 | 2015 |
| 25 | [Transdev Pays de la Loire](https://www.tamtam.ai/c/transdev-pays-de-la-loire) (transdev-paysdelaloire.com)<br>A company in Pays de la Loire region provides customized mobility solutions for residents, focusing on safety, green energy, and connected mobility | Truck Transportation | 🇫🇷 Nantes | 23 |  |
| 26 | [PNE France](https://www.tamtam.ai/c/pne-france) (pne-france.fr)<br>Develops, builds, and operates wind and solar farms across metropolitan territory, integrating human and environmental stakes in renewable energy projects. | Renewable Energy Power Generation | 🇫🇷 Nantes | 20 | 2003 |

## 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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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-nantes