# The 30 largest critical infrastructure operators in the Loire-Atlantique department

Tamtam tracks 59 critical infrastructure operators headquartered in the Loire-Atlantique department. This list ranks the 30 largest by number of employees on LinkedIn, led by CHU de Nantes, Nantes Métropole and Caisse d'Epargne Bretagne Pays de Loire. Their median headcount is 422. Half of them were founded in 1990 or later. The most common headquarters are Nantes (16), Saint-Herblain (3) and Orvault (2).

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.

🇫🇷 Loire-Atlantique · 30 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 | [Caisse d'Epargne Bretagne Pays de Loire](https://www.tamtam.ai/c/caisse-d-epargne-bretagne-pays-de-loire) (caisse-epargne.fr)<br>Regional mutualist bank with 420 agencies, serving individuals and professionals, supporting local economy through business centers and specialized subsidiaries. | Banking | 🇫🇷 Orvault | 2,428 |  |
| 4 | [LNA Santé](https://www.tamtam.ai/c/lna-sante) (lna-sante.com)<br>Family-owned healthcare provider based in Nantes since 1990, offering care and support for individuals with fragility or loss of autonomy through various facilities | Hospitals and Health Care | 🇫🇷 Vertou | 2,080 | 1990 |
| 5 | [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 |  |
| 6 | [MAISON DES AGES ET DES CULTURES](https://www.tamtam.ai/c/maison-des-ages-et-des-cultures) (mdac.fr)<br>Non-profit association based in Legé, France, focused on promoting intergenerational and intercultural exchanges and activities within the community | Individual and Family Services | 🇫🇷 Legé | 1,530 |  |
| 7 | [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 |  |
| 8 | [HOP!](https://www.tamtam.ai/c/hop) (hop.fr)<br>regional airline operating frequent flights from Roissy-CDG and Lyon, serving business and leisure travelers across France and Europe | Airlines and Aviation | 🇫🇷 Bouguenais | 1,326 |  |
| 9 | [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 |
| 10 | [Centre Hospitalier de Saint-Nazaire](https://www.tamtam.ai/c/centre-hospitalier-de-saint-nazaire) (hopital-saintnazaire.fr)<br>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 |
| 11 | [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 |
| 12 | [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 |  |
| 13 | [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 |  |
| 14 | [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 |
| 15 | [EBTrans](https://www.tamtam.ai/c/ebtrans) (ebtrans.com)<br>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 | Truck Transportation | 🇫🇷 Couëron | 422 | 1996 |
| 16 | [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 |
| 17 | [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 |
| 18 | [AS 24](https://www.tamtam.ai/c/as-24) (as24.com)<br>Specialized fuel distribution network for heavy goods vehicles across 29 countries, offering secure transactions, competitive prices, and dedicated stations. | Oil and Gas | 🇫🇷 Saint-Herblain | 380 | 1988 |
| 19 | [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 |  |
| 20 | [Santé Atlantique](https://www.tamtam.ai/c/sante-atlantique) (santeatlantique.fr)<br>Santé Atlantique provides comprehensive and excellent healthcare services, offering a wide range of medical specialties with 1,500 healthcare professionals | Hospitals and Health Care | 🇫🇷 Saint-Herblain | 319 |  |
| 21 | [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 |
| 22 | [EPSYLAN](https://www.tamtam.ai/c/epsylan) (ch-epsylan.fr)<br>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 |
| 23 | [LABORATOIRE SYNLAB BIOLIANCE](https://www.tamtam.ai/c/laboratoire-synlab-bioliance) (bioliance.fr)<br>Network of medical laboratories providing prevention, diagnostic, and follow-up biological analyses across Nantes metropolitan area and surrounding regions. | Hospitals and Health Care | 🇫🇷 Saint-Herblain | 193 | 1963 |
| 24 | [CapAtlantique La Baule-Guérande Agglo](https://www.tamtam.ai/c/capatlantique-la-baule-guerande-agglo) (cap-atlantique.fr)<br>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 |  |
| 25 | [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 |
| 26 | [Clinique Mutualiste de L'Estuaire](https://www.tamtam.ai/c/clinique-mutualiste-de-l-estuaire) (clinique-mutualiste-estuaire.fr)<br>A 240-bed facility with over 450 professionals offering comprehensive medical care, including surgery, oncology, medicine, and specialized services for obese patients | Hospitals and Health Care | 🇫🇷 Saint-Nazaire | 166 | 2012 |
| 27 | [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 |  |
| 28 | [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 |
| 29 | [Centre d’Incendie et de Secours](https://www.tamtam.ai/c/centre-d-incendie-et-de-secours) (terre.defense.gouv.fr)<br>A higher education institution located in Indre, France that focuses on fire and rescue services training and education | Higher Education | 🇫🇷 Indre | 154 |  |
| 30 | [HAD - Hôpital à Domicile Nantes & région](https://www.tamtam.ai/c/had-hopital-a-domicile-nantes-and-region) (had-nantesetregion.fr)<br>L’HAD Nantes & région provides medical and paramedical care at home to avoid hospitalization, with a focus on patient-centered and humanistic approach | Hospitals and Health Care | 🇫🇷 Orvault | 131 | 1980 |

## 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](https://www.tamtam.ai/l/largest-companies-loire-atlantique) (2,046)
- [Companies with in-house R&D in the Loire-Atlantique department](https://www.tamtam.ai/l/r-and-d-companies-loire-atlantique) (207)
- [Retail chains in the Loire-Atlantique department](https://www.tamtam.ai/l/retail-chains-loire-atlantique) (163)
- [Multinational companies in the Loire-Atlantique department](https://www.tamtam.ai/l/multinational-companies-loire-atlantique) (159)
- [Professional services firms in the Loire-Atlantique department](https://www.tamtam.ai/l/professional-services-firms-loire-atlantique) (158)
- [Software Development companies in the Loire-Atlantique department](https://www.tamtam.ai/l/software-development-companies-loire-atlantique) (137)
- [SaaS companies in the Loire-Atlantique department](https://www.tamtam.ai/l/saas-companies-loire-atlantique) (135)
- [IT services companies in the Loire-Atlantique department](https://www.tamtam.ai/l/it-services-companies-loire-atlantique) (130)
- [Manufacturers in the Loire-Atlantique department](https://www.tamtam.ai/l/manufacturers-loire-atlantique) (125)
- [IT Services and IT Consulting companies in the Loire-Atlantique department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-loire-atlantique) (110)
- [Consulting firms in the Loire-Atlantique department](https://www.tamtam.ai/l/consulting-firms-loire-atlantique) (94)
- [Distributors and wholesalers in the Loire-Atlantique department](https://www.tamtam.ai/l/distributors-and-wholesalers-loire-atlantique) (94)
- [Hardware manufacturers in the Loire-Atlantique department](https://www.tamtam.ai/l/hardware-companies-loire-atlantique) (86)
- [Business Consulting and Services companies in the Loire-Atlantique department](https://www.tamtam.ai/l/business-consulting-and-services-companies-loire-atlantique) (83)
- [Public sector organisations in the Loire-Atlantique department](https://www.tamtam.ai/l/public-sector-organisations-loire-atlantique) (82)
- [Family-owned companies in the Loire-Atlantique department](https://www.tamtam.ai/l/family-owned-companies-loire-atlantique) (71)
- [Education providers in the Loire-Atlantique department](https://www.tamtam.ai/l/education-companies-loire-atlantique) (68)
- [Real Estate companies in the Loire-Atlantique department](https://www.tamtam.ai/l/real-estate-companies-loire-atlantique) (67)
- [Financial services firms in the Loire-Atlantique department](https://www.tamtam.ai/l/financial-services-firms-loire-atlantique) (65)
- [Law Practice companies in the Loire-Atlantique department](https://www.tamtam.ai/l/law-practice-companies-loire-atlantique) (62)
- [Retail companies in the Loire-Atlantique department](https://www.tamtam.ai/l/retail-companies-loire-atlantique) (61)
- [Subscription businesses in the Loire-Atlantique department](https://www.tamtam.ai/l/subscription-businesses-loire-atlantique) (61)
- [Events Services companies in the Loire-Atlantique department](https://www.tamtam.ai/l/events-services-companies-loire-atlantique) (58)
- [Construction companies in the Loire-Atlantique department](https://www.tamtam.ai/l/construction-companies-loire-atlantique) (57)

## The same list elsewhere in France

- [Critical infrastructure operators in France](https://www.tamtam.ai/l/critical-infrastructure-operators-france) (2,721)
- [Critical infrastructure operators in Île-de-France](https://www.tamtam.ai/l/critical-infrastructure-operators-ile-de-france) (780)
- [Critical infrastructure operators in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/critical-infrastructure-operators-auvergne-rhone-alpes) (299)
- [Critical infrastructure operators in Grand Est](https://www.tamtam.ai/l/critical-infrastructure-operators-grand-est) (257)
- [Critical infrastructure operators in Occitanie](https://www.tamtam.ai/l/critical-infrastructure-operators-occitanie) (216)
- [Critical infrastructure operators in Nouvelle-Aquitaine](https://www.tamtam.ai/l/critical-infrastructure-operators-nouvelle-aquitaine) (209)
- [Critical infrastructure operators in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/critical-infrastructure-operators-provence-alpes-cote-dazur) (200)
- [Critical infrastructure operators in Hauts-de-France](https://www.tamtam.ai/l/critical-infrastructure-operators-hauts-de-france) (174)
- [Critical infrastructure operators in the Hauts-de-Seine department](https://www.tamtam.ai/l/critical-infrastructure-operators-hauts-de-seine) (169)
- [Critical infrastructure operators in Pays de la Loire](https://www.tamtam.ai/l/critical-infrastructure-operators-pays-de-la-loire) (127)
- [Critical infrastructure operators in Brittany](https://www.tamtam.ai/l/critical-infrastructure-operators-brittany) (120)
- [Critical infrastructure operators in Normandy](https://www.tamtam.ai/l/critical-infrastructure-operators-normandy) (103)
- [Critical infrastructure operators in the Bouches-du-Rhône department](https://www.tamtam.ai/l/critical-infrastructure-operators-bouches-du-rhone) (98)
- [Critical infrastructure operators in the Rhône department](https://www.tamtam.ai/l/critical-infrastructure-operators-rhone) (94)
- [Critical infrastructure operators in Centre-Val de Loire](https://www.tamtam.ai/l/critical-infrastructure-operators-centre-val-de-loire) (87)
- [Critical infrastructure operators in the Nord department](https://www.tamtam.ai/l/critical-infrastructure-operators-nord) (87)
- [Critical infrastructure operators in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/critical-infrastructure-operators-bourgogne-franche-comte) (76)
- [Critical infrastructure operators in the Haute-Garonne department](https://www.tamtam.ai/l/critical-infrastructure-operators-haute-garonne) (64)
- [Critical infrastructure operators in the Gironde department](https://www.tamtam.ai/l/critical-infrastructure-operators-gironde) (63)
- [Critical infrastructure operators in the Hérault department](https://www.tamtam.ai/l/critical-infrastructure-operators-herault) (57)
- [Critical infrastructure operators in the Seine-Saint-Denis department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-saint-denis) (53)
- [Critical infrastructure operators in the Seine-Maritime department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-maritime) (46)
- [Critical infrastructure operators in the Ille-et-Vilaine department](https://www.tamtam.ai/l/critical-infrastructure-operators-ille-et-vilaine) (45)
- [Critical infrastructure operators in Paris](https://www.tamtam.ai/l/critical-infrastructure-operators-paris) (331)

---

Source: https://www.tamtam.ai/l/critical-infrastructure-operators-loire-atlantique