The companies listed in Essonne are primarily critical infrastructure operators, with a strong emphasis on healthcare. They range from large public health institutions to specialized private hospitals. Notable examples include CENTRE HOSPITALIER SUD FRANCILIEN, a public healthcare provider, and Hôpital privé Jacques Cartier, a private hospital specializing in cardiology. ASN designs and maintains submarine cable systems, while French bee is a long-haul airline.
The data shows a significant concentration in the healthcare sector, with many hospitals and clinics providing diverse medical services across the department. Beyond healthcare, there are also key players in telecommunications, such as ASN and Axians Rail, and in waste management, like SEMARDEL.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 1,717 | ||||
| 2 |
CENTRE HOSPITALIER SUD FRANCILIENchsf.fr
Public healthcare institution serving one million people in southern Île-de-France, providing medical services and hospital care to the community. |
1,219 | |||
| 3 |
French beefrenchbee.com
A French long-haul airline offering affordable flights to various destinations with modern Airbus A350 planes and a focus on reducing carbon footprint |
540 | |||
| 4 |
Groupe hospitalier Nord-Essonnegh-nord-essonne.fr
Regional hospital network providing comprehensive medical services including emergency, maternity, pediatrics, surgery, psychiatry, and critical care with modern technical facilities. |
446 | |||
| 5 |
Centre Hospitalier de Blignychbligny.fr
Non-profit hospital specializing in cardiovascular, respiratory, oncology, hematology, infectious diseases with acute and rehabilitation care services. |
280 | |||
| 6 |
Hôpital privé Jacques Cartierhopital-prive-jacques-cartier-massy.ramsaysante.fr
Leading private hospital in Southern Paris, offers general and specialized surgery, emergency services, advanced medical imaging, and renowned adult and pediatric cardiology. |
252 | |||
| 7 |
Cœur d'Essonne Agglomérationcoeuressonne.fr
Local government collaboration of 21 communes providing quality public services, supporting 203,000 residents and fostering regional development projects. |
221 | |||
| 8 |
Groupe Hospitalier les Cheminotsghc91.fr
Two healthcare facilities specializing in post-acute care and rehabilitation services, located in Draveil and Ris Orangis, France. |
201 | |||
| 9 |
HOPITAL PRIVE CLAUDE GALIENhopital-prive-claude-galien-quincy-sous-senart.ramsaysante.fr
Private hospital group. Advanced medical facility. General and orthopedic surgery, cardiology, hemodialysis. Located 25 km from Paris, 289 beds. |
190 | |||
| 10 |
Clinique de L'Yvetteclinique-yvette.com
Offers surgical, obstetrical care, specialized hand emergency services, cancer treatment, morbid obesity management, and breast cancer screening, including reconstructive surgery. |
142 | |||
| 11 |
SEMARDELsemardel.fr
Specialized in waste collection, sorting, treatment, and recovery across multiple waste streams including household, industrial, and electronic waste. |
129 | |||
| 12 |
HOPITAL LES MAGNOLIASlesmagnolias-univi.fr
A non-profit private healthcare facility in Essonne, near Paris, specializing in geriatric care, promoting healthy aging and autonomy for seniors |
127 | |||
| 13 | 
CA CONSUMER FINANCEca-cf.fr
A financial services company based in France, specializing in consumer finance solutions |
123 | |||
| 14 |
Centre hospitalier d’Arpajonch-arpajon.fr
A hospital located in Essonne offering quality healthcare services across six specialized departments and a technical platform, emphasizing professional skills and human qualities |
104 | |||
| 15 |
Axians Railaxians.fr
Axians Rail, a subsidiary of VINCI Énergies, specializes in telecommunications and signaling infrastructure for railway networks, offering design, construction, and testing services nationwide |
98 | |||
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 | 88 | ||||
| 17 |
ADP Managementparisaeroport.fr
A subsidiary of Aéroports de Paris, specializing in investing and managing airport operations in various international locations, focusing on sustainable development and route development |
87 | |||
| 18 |
Communauté de communes entre Juine et Renardeentrejuineetrenarde.org
An intermunicipal structure in France's Essonne region, uniting 16 towns to develop and manage projects for a population of 27,500 residents |
74 | |||
| 19 |
SEMAERsemardel.fr
A subsidiary specializing in waste management services such as waste collection, urban cleaning, equipment rental, and waste facility management |
68 | |||
| 20 |
ETMFetmftransport.fr
Specialized in operating maintenance and freight trains across France, providing reliable and safe services to meet clients' needs with a focus on safety and teamwork |
66 | |||
| 21 |
Hôpital Privé du Val d'Yerreshopital-prive-val-dyerres.com
A private hospital in the southeast of Paris with 151 beds, offering surgical services, emergency care, laboratory services, medical imaging, and various medical specialties |
65 | |||
| 22 |
BANQUE CHABRIERESbanque-chabrieres.fr
A banking subsidiary of Groupement des Mousquetaires, continuously evolving its services since 1988 to provide optimal banking products to clients |
58 | |||
| 23 | 48 | ||||
| 24 |
Clinique Pasteur - Almaviva Santéclinique-pasteur-risorangis.fr
Specializes in adult cancer care, offering chemotherapy treatments and multidisciplinary support to improve patient autonomy and facilitate their return home. |
38 | |||
| 25 |
KEOLIS VAL D'YERRES VAL DE SEINEkeolis-idf.com
The company operates and maintains urban, suburban, and interurban transport networks for over 300 authorities in 13 countries, offering a variety of transport modes |
20 | |||
| 26 |
CLINIQUE DE L YVETTEclinique-yvette.com
Healthcare facility in Longjumeau with 143 beds, three entrances, medical imaging, emergency services, and a 200-space parking lot. |
18 | |||
| 27 |
Interlink Transport SAS
Fleet of vehicles from light to 44t trailers, providing complete transport and logistics solutions for industrial B2B mass flows. |
17 | |||
| 28 |
SYNDICAT DES EAUX OUEST ESSONNEeauouestessonne.fr
This company is involved in water management services in the western Essonne region, ensuring access to safe and clean water for residents |
12 | |||
| 29 |
L'Aveyronnaise d'Assuranceslaveyronnaisedassurances.fr
The company provides health, automobile, and home insurance policies to individuals and families to protect their well-being and assets |
5 | |||
| 30 |
SPL - Confluence Seine Essonne Energie
A Public Local Company converts wastewater residues into energy resources, a pioneering initiative in Essonne, France |
4 | |||
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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 Essonne department
- The largest companies in the Essonne department 1,149
- Companies with in-house R&D in the Essonne department 198
- Multinational companies in the Essonne department 156
- Manufacturers in the Essonne department 127
- Hardware manufacturers in the Essonne department 114
- Distributors and wholesalers in the Essonne department 76
- IT Services and IT Consulting companies in the Essonne department 70
- Professional services firms in the Essonne department 68
- Public sector organisations in the Essonne department 66
- Aerospace and defence companies in the Essonne department 65
- IT services companies in the Essonne department 60
- Retail chains in the Essonne department 59
- Construction companies in the Essonne department 56
- Software Development companies in the Essonne department 51
- Pharmaceutical companies in the Essonne department 45
- Electronics and semiconductor companies in the Essonne department 44
- Research institutes in the Essonne department 42
- Events Services companies in the Essonne department 41
- SaaS companies in the Essonne department 41
- Consulting firms in the Essonne department 40
- Family-owned companies in the Essonne department 38
- Contract manufacturers in the Essonne department 35
- Research Services companies in the Essonne department 35
- Education providers in the Essonne department 30
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 Loire-Atlantique department 59
- 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 Paris 331