# List of critical infrastructure operators in the Seine-Maritime department

Tamtam tracks 46 critical infrastructure operators headquartered in the Seine-Maritime department. This list ranks the 30 largest by number of employees on LinkedIn, led by Matmut, CHU de Rouen and Crédit Agricole Normandie-Seine. Their median headcount is 265. Half of them were founded in 2007 or later. The most common headquarters are Le Havre (10) and Rouen (8).

The companies listed operate critical infrastructure in Seine-Maritime, with a notable concentration in the public and semi-public sectors. These are mostly large organizations, with many employing over 500 people. Matmut, an insurance provider, employs 4244 people, while CHU de Rouen, a hospital network, has 3823 employees. Banking services are represented by Crédit Agricole Normandie-Seine and Caisse d'Epargne Normandie, with 1566 and 1402 employees respectively. HAROPA PORT manages a major French river-maritime port network.

A significant pattern is the prevalence of public services and regulated industries. Hospitals and healthcare facilities are prominent, including Groupe Hospitalier du Havre - GHH, a leading healthcare provider, and Clinique Saint Hilaire, a medical surgical facility. Government administration entities like Métropole Rouen Normandie and Le Havre Seine Métropole are also key, managing communes and promoting local development.

🇫🇷 Seine-Maritime · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Matmut](https://www.tamtam.ai/c/matmut) (matmut.fr)<br>Provides diverse insurance products, including health and life, to millions of members, emphasizing sustainability, social responsibility, and community well-being in France. | Insurance | 🇫🇷 Rouen | 4,244 | 1961 |
| 2 | [CHU de Rouen](https://www.tamtam.ai/c/chu-de-rouen) (chu-rouen.fr)<br>Large hospital network providing patient care, medical education, and research, supporting regional healthcare and training future health professionals. | Hospitals and Health Care | 🇫🇷 Rouen | 3,823 |  |
| 3 | [Crédit Agricole Normandie-Seine](https://www.tamtam.ai/c/credit-agricole-normandie-seine) (ca-normandie-seine.fr)<br>Regional bank with 130 branches and online services for individuals, professionals, farmers, businesses, and public communities in Eure and Seine-Maritime. | Banking | 🇫🇷 Bois-Guillaume | 1,566 |  |
| 4 | [Caisse d'Epargne Normandie](https://www.tamtam.ai/c/caisse-d-epargne-normandie) (caisse-epargne.fr)<br>Regional bank serving individuals, professionals, businesses, and local authorities with tailored financial advice and community project support in Normandy. | Banking | 🇫🇷 Bois-Guillaume | 1,402 | 2008 |
| 5 | [Groupe Hospitalier du Havre - GHH](https://www.tamtam.ai/c/groupe-hospitalier-du-havre-ghh) (ch-havre.fr)<br>Leading healthcare provider, comprehensive care, advanced medical technology, collaboration with other hospitals, diverse medical professions, round-the-clock technical platform. | Hospitals and Health Care | 🇫🇷 Montivilliers | 893 | 1669 |
| 6 | [HAROPA PORT](https://www.tamtam.ai/c/haropa-port) (haropaport.com)<br>Manages a major French river-maritime port network, connecting international shipping with a vast hinterland, handling significant maritime and river traffic. | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Le Havre | 892 | 2021 |
| 7 | [Métropole Rouen Normandie](https://www.tamtam.ai/c/metropole-rouen-normandie) (metropole-rouen-normandie.fr)<br>Manages 71 communes, providing essential services like water, transport, waste, promoting local development, tourism, and actively addressing climate change. | Government Administration | 🇫🇷 Rouen | 886 | 2015 |
| 8 | [SDIS 76 - Sapeurs-pompiers de la Seine-Maritime](https://www.tamtam.ai/c/sdis-76-sapeurs-pompiers-de-la-seine-maritime) (sdis76.fr)<br>Departmental organization managing emergency services, including fire fighting, victim rescue, risk prevention, and specialized interventions in hazardous environments. | Public Safety | 🇫🇷 Yvetot | 657 |  |
| 9 | [Carsat Normandie](https://www.tamtam.ai/c/carsat-normandie) (carsat-normandie.fr)<br>Provides retirement, social action, and occupational health services. Manages substantial retirement payments, social support, and workplace prevention across the region. | Government Administration | 🇫🇷 Rouen | 552 |  |
| 10 | [Le Havre Seine Métropole](https://www.tamtam.ai/c/le-havre-seine-metropole) (lehavreseinemetropole.fr)<br>This Metropolis aims for excellence through innovation in economy, society, and environment. It focuses on green and blue economy, higher education, and tourism, serving its 275,000 inhabitants. | Government Administration | 🇫🇷 Le Havre | 527 | 2019 |
| 11 | [Groupe SOGESTRAN](https://www.tamtam.ai/c/groupe-sogestran) (sogestran.com)<br>Inland waterway and maritime shipowner offering environmentally friendly transport for oil, chemicals, dry bulk, general goods, with focus on quality and safety | Maritime Transportation | 🇫🇷 Le Havre | 303 | 1948 |
| 12 | [Centre hospitalier intercommunal Elbeuf Louviers Val de Reuil](https://www.tamtam.ai/c/centre-hospitalier-intercommunal-elbeuf-louviers-val-de-reuil) (chi-elbeuf-louviers.fr)<br>Public healthcare facility in Normandy with 1083 beds, 2143 staff including 267 medical personnel, two hospital sites, maternity, and five nursing homes. | Hospitals and Health Care | 🇫🇷 Saint-Aubin-lès-Elbeuf | 291 | 1989 |
| 13 | [LVO Group](https://www.tamtam.ai/c/lvo-group) (lv-overseas.fr)<br>Global logistics provider with presence in France, French overseas territories, Asia, Africa, Middle East, and US, offering flexible transport solutions worldwide | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Épouville | 281 | 1932 |
| 14 | [Transdev Rouen (TCAR)](https://www.tamtam.ai/c/transdev-rouen-tcar) (transdev.com)<br>Providing safe, efficient, and innovative mobility solutions for residents of the Rouen Normandy Metropolis to navigate the area | Urban Transit Services | 🇫🇷 Rouen | 274 |  |
| 15 | [Clinique Saint Hilaire](https://www.tamtam.ai/c/clinique-saint-hilaire) (clinique-sainthilaire.fr)<br>Medical surgical facility with 223 beds, 380 staff, 75 practitioners, offering innovative care across surgical, cardiovascular, and oncology specialties. | Hospitals and Health Care | 🇫🇷 Rouen | 265 | 1886 |
| 16 | [Transdev Normandie](https://www.tamtam.ai/c/transdev-normandie) (transdev.com)<br>Providing sustainable, innovative, and secure mobility solutions for communities, Transdev Normandie collaborates with local authorities and businesses to optimize transportation services | Urban Transit Services | 🇫🇷 Sotteville-lès-Rouen | 243 | 2007 |
| 17 | [UGECAM NORMANDIE](https://www.tamtam.ai/c/ugecam-normandie) (groupe-ugecam.fr)<br>A non-profit group in France providing healthcare and support services for people with physical and intellectual disabilities, with a focus on equality and quality care | Hospitals and Health Care | 🇫🇷 Le Petit-Quevilly | 224 | 2000 |
| 18 | [VYV 3 Normandie](https://www.tamtam.ai/c/vyv-3-normandie) (normandie.vyv3.fr)<br>Provides extensive medical and paramedical care, social support services, and community health programs across Normandy for diverse populations. | Hospitals and Health Care | 🇫🇷 Rouen | 222 | 2014 |
| 19 | [Caux Seine agglo](https://www.tamtam.ai/c/caux-seine-agglo) (cauxseine.fr)<br>Caux Seine agglo is an intermunicipal cooperation organization uniting 50 municipalities and 77,777 residents, promoting economic and social development in the region | Public Policy Offices | 🇫🇷 Lillebonne | 212 | 2008 |
| 20 | [HOPITAL PRIVE DE L'ESTUAIRE](https://www.tamtam.ai/c/hopital-prive-de-l-estuaire) (hopital-prive-de-l-estuaire-le-havre.ramsaysante.fr)<br>A healthcare facility in Le Havre, part of Ramsay Santé group, providing comprehensive inpatient and outpatient services with a focus on high-quality patient care | Hospitals and Health Care | 🇫🇷 Le Havre | 212 | 2010 |
| 21 | [CLINIQUE DU CEDRE](https://www.tamtam.ai/c/clinique-du-cedre) (clinique-du-cedre.fr)<br>A hospital and health care company located in Bois Guillaume, France, specializing in providing medical services to patients | Hospitals and Health Care | 🇫🇷 Bois-Guillaume | 184 |  |
| 22 | [Assurance Maladie de la Seine-Maritime](https://www.tamtam.ai/c/assurance-maladie-de-la-seine-maritime) (ameli.fr)<br>A leading social protection organization in the Rouen-Elbeuf-Dieppe area, ensuring universal access to healthcare rights, promoting health preservation, and improving healthcare efficiency | Government Administration | 🇫🇷 Rouen | 137 | 1945 |
| 23 | [CLINIQUE DES ORMEAUX](https://www.tamtam.ai/c/clinique-des-ormeaux) (ormeaux.com)<br>Hospital & health care company located in Le Havre, France, providing medical services to patients in need of healthcare | Hospitals and Health Care | 🇫🇷 Le Havre | 127 |  |
| 24 | [Générale de Manutention Portuaire](https://www.tamtam.ai/c/generale-de-manutention-portuaire) (gmportuaire.fr)<br>Leading French port handling company managing container terminals, exceptional cargo, refrigerated container repair, and inland transport with eco-friendly, digitalized operations. | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Le Havre | 127 |  |
| 25 | [Les Escales - EHPAD publics du Havre](https://www.tamtam.ai/c/les-escales-ehpad-publics-du-havre) (ehpad-lesescales.fr)<br>Les Escales provides specialized care for elderly residents in Le Havre through 6 public nursing homes, alongside home care services | Hospitals and Health Care | 🇫🇷 Le Havre | 115 | 2016 |
| 26 | [CLINIQUE OCEANE](https://www.tamtam.ai/c/clinique-oceane) (clinique-oceane.ramsaysante.fr)<br>Located in Le Havre, Clinique Océane, part of Ramsay Santé group, provides exceptional healthcare services in a welcoming environment since 2012 | Hospitals and Health Care | 🇫🇷 Le Havre | 105 | 2012 |
| 27 | [Compagnie Fluviale de Transport](https://www.tamtam.ai/c/compagnie-fluviale-de-transport) (sogestran.com)<br>A company that specializes in French barging services and operates as a shipping operator as well | Maritime Transportation | 🇫🇷 Le Havre | 96 | 1988 |
| 28 | [Vidi - nora imagerie](https://www.tamtam.ai/c/vidi-nora-imagerie) (nora-imagerie.fr)<br>A group of medical imaging centers in Calvados, Eure, and Seine-Maritime, offering various medical imaging and interventional procedures, focusing on patient care | Medical Practices | 🇫🇷 Le Havre | 75 | 2021 |
| 29 | [SMEDAR](https://www.tamtam.ai/c/smedar) (smedar.fr)<br>Public organization managing waste collection, sorting, treatment, and recycling services for over 615,000 residents in Rouen area. | Environmental Services | 🇫🇷 Le Grand-Quevilly | 71 | 1999 |
| 30 | [Centre Hospitalier Durécu-Lavoisier (CHDL)](https://www.tamtam.ai/c/centre-hospitalier-durecu-lavoisier-chdl) (chdl.fr)<br>The company provides medical care and rehabilitation services through nursing homes within the Durécu-Lavoisier Hospital Center and L'Eau Vive | Hospitals and Health Care | 🇫🇷 Darnétal | 69 |  |

## 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 Seine-Maritime department

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- [Manufacturers in the Seine-Maritime department](https://www.tamtam.ai/l/manufacturers-seine-maritime) (72)
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- [Public sector organisations in the Seine-Maritime department](https://www.tamtam.ai/l/public-sector-organisations-seine-maritime) (65)
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- [Family-owned companies in the Seine-Maritime department](https://www.tamtam.ai/l/family-owned-companies-seine-maritime) (44)
- [IT services companies in the Seine-Maritime department](https://www.tamtam.ai/l/it-services-companies-seine-maritime) (40)
- [Hardware manufacturers in the Seine-Maritime department](https://www.tamtam.ai/l/hardware-companies-seine-maritime) (38)
- [Education providers in the Seine-Maritime department](https://www.tamtam.ai/l/education-companies-seine-maritime) (36)
- [Healthcare providers in the Seine-Maritime department](https://www.tamtam.ai/l/healthcare-providers-seine-maritime) (34)
- [Logistics companies in the Seine-Maritime department](https://www.tamtam.ai/l/logistics-companies-seine-maritime) (34)
- [Financial services firms in the Seine-Maritime department](https://www.tamtam.ai/l/financial-services-firms-seine-maritime) (32)
- [IT Services and IT Consulting companies in the Seine-Maritime department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-seine-maritime) (30)
- [Real Estate companies in the Seine-Maritime department](https://www.tamtam.ai/l/real-estate-companies-seine-maritime) (30)
- [Higher Education companies in the Seine-Maritime department](https://www.tamtam.ai/l/higher-education-companies-seine-maritime) (28)
- [Software Development companies in the Seine-Maritime department](https://www.tamtam.ai/l/software-development-companies-seine-maritime) (28)
- [Government Administration companies in the Seine-Maritime department](https://www.tamtam.ai/l/government-administration-companies-seine-maritime) (27)
- [Industrial Machinery Manufacturing companies in the Seine-Maritime department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-seine-maritime) (27)
- [Consulting firms in the Seine-Maritime department](https://www.tamtam.ai/l/consulting-firms-seine-maritime) (26)
- [Hospitals and Health Care companies in the Seine-Maritime department](https://www.tamtam.ai/l/hospitals-and-health-care-companies-seine-maritime) (25)

## 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)
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- [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)
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- [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 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)

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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-seine-maritime