The Essonne department hosts a significant concentration of higher education and research institutions, alongside key healthcare providers. Notable examples include École Polytechnique, a leading French institution for science and technology research and education, and CentraleSupélec, which provides higher education across three campuses. Télécom Paris focuses on ICT programs, while ENSTA is a public institution for higher education, research, and innovation. Paris-Sud University (Paris XI) is a research university, and Institut Mines-Télécom (IMT) is a group of engineering and management graduate schools. The department also features major healthcare facilities like CENTRE HOSPITALIER SUD FRANCILIEN and Groupe hospitalier Nord-Essonne.
Most of the listed companies are well-established institutions, with several founded in the 18th and 19th centuries, indicating a long-standing commitment to education and healthcare in the region. There is a strong cluster of headquarters in Palaiseau and Orsay, highlighting these areas as central hubs for academic and medical activities. While higher education and healthcare dominate, there are also specialized firms such as SITECH France, providing digital solutions for construction, and DAF CONSEIL, which specializes in automotive technical training.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
École Polytechniquepolytechnique.edu
Leading French institution offering top-level research, academic programs, and innovation in science and technology with a strong emphasis on excellence and humanist traditions |
4,377 | |||
| 2 |
CentraleSupéleccentralesupelec.fr
Provides higher education with 4,500 students across three campuses, 370 staff, 3 international schools, 5 associated labs, and partners with 176 universities and 140 companies. |
2,125 | |||
| 3 |
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 | |||
| 4 |
Télécom Paristelecom-paris.fr
A leading educational institution in ICT, offering various programs in engineering, masters, and PhD, with a focus on innovation and entrepreneurship in the digital world |
953 | |||
| 5 | 916 | ||||
| 6 |
Paris-Sud University (Paris XI)universite-paris-saclay.fr
A prestigious research university focused on understanding the world, student success, and meeting society's needs with top student integration into the workforce |
910 | |||
| 7 |
Institut Mines-Télécom (IMT)imt.fr
Leading public group of engineering and management graduate schools, higher education and research institution, with eight public and two affiliate schools. |
474 | |||
| 8 |
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 | |||
| 9 |
Institut Polytechnique de Parisip-paris.fr
Public higher education institution combining six top French engineering schools to deliver excellent training programs and cutting-edge research. |
370 | |||
| 10 |
IUT d'Orsayiut-orsay.universite-paris-saclay.fr
Official page of the University Institute of Technology (IUT) in Orsay, part of the University of Paris-Saclay |
216 | |||
| 11 |
Faculté de Pharmacie - Université Paris-Saclaypharmacie.universite-paris-saclay.fr
Located in Orsay, the Faculty of Pharmacy is part of the University Paris-Saclay It is the largest academic research center in Pharmacy in France, offering exceptional training programs |
84 | |||
| 12 |
SITECH Francesitech-france.fr
Providing digital and robotic solutions for construction sites including topography, machine guidance, production optimization software, and training services. |
73 | |||
| 13 |
DAF CONSEILdafconseil.com
Specializes in automotive technical training, support, consulting, engineering, and web-based SaaS solutions for repair industry professionals. |
49 | |||
| 14 |
Up Startupstart-school.fr
Up Start is a school that encourages bold minds to pursue entrepreneurship, offering high-quality programs and hands-on experience to develop future leaders |
47 | |||
| 15 |
ISIisicrunch.com
Development of SaaS platforms enabling publishers to create accessible, enriched digital textbooks and e-learning modules for learners with disabilities. |
41 | |||
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 |
INRI'S Formationsinris-formations.com
A network specializing in accelerated driving courses, offering a range of courses in auto, moto, boat, and license point recovery, with a focus on digital transition and business development |
35 | |||
| 17 |
Lycée de la Vallée de Chevreuselyc-chevreuse-gif.ac-versailles.fr
A general and technological high school providing education and training for students in various academic and technical fields |
33 | |||
| 18 |
Télécom Paris Executive Educationexecutive-education.telecom-paris.fr
Telecom Paris Executive Education offers lifelong training in digital sciences & technologies, providing certifications, short courses, and e-learning for professionals and businesses |
23 | |||
| 19 |
En Linea Positivavanessamaneirocoach.com
An online network connecting professionals in physical, mental, spiritual, and energetic well-being to promote personal and professional development through virtual events and resources |
16 | |||
| 20 |
Fondation AgroParisTechfondation.agroparistech.fr
The company's foundation supports projects promoting sustainable solutions for food, health, and the environment, encouraging individuals to take action for a better planet |
12 | |||
| 21 |
Learning Robotslearningrobots.ai
Demonstrates AI and neural network functions, offering varied learning from elementary to professional training, helping individuals understand AI and their own brains. |
12 | |||
| 22 |
Primaverasprimaveras.fr
Primaveras helps individuals find balance and fulfillment by harmonizing heart and mind, guiding them to make thoughtful career decisions aligned with their values |
11 | |||
| 23 |
CMDL Centre des Musiques Didier Lockwoodcmdl.eu
Established in 2000, the Center for Music offers exceptional jazz and improvisation training, serving as a hub for French and European musicians to teach, perform, and create |
10 | |||
| 24 |
FORMAGOGYformagogy.fr
The company specializes in developing human capital through various training solutions such as pedagogical engineering, in-person and digital training, and HR outsourcing |
9 | |||
| 25 | 7 | ||||
| 26 |
AUDIT'ACTaudit-act.com
Legal training organization specializing in lease law, providing project support for lease agreements, assisting with lease negotiations, and optimizing rent and charges for businesses |
6 | |||
| 27 |
Centre Spatial de l'École Polytechniquepolytechnique.edu
The company specializes in space research and development, focusing on innovative solutions in the field of aerospace technology |
6 | |||
| 28 |
ALITHIAalithia.fr
Alithia team offers HR services such as recruitment, training, payroll, organizational management, and consultancy, as well as customized training programs |
5 | |||
| 29 |
OpenCertifopencertif.fr
OpenCertif helps individuals obtain professional certifications from leading global publishers like Microsoft, Adobe, and Autodesk to enhance skills, credibility, and job opportunities |
5 | |||
| 30 |
ALUCISalucis.ovh
Consulting and training firm for Quality, Safety, Environment (QSE) management systems, helping clients optimize their QSE performance and manage training programs, including Qualiopi certification. |
3 | |||
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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
- Critical infrastructure operators in the Essonne department 32
The same list elsewhere in France
- Education providers in Île-de-France 1,300
- Education providers in Auvergne-Rhône-Alpes 309
- Education providers in Grand Est 215
- Education providers in Provence-Alpes-Côte d'Azur 212
- Education providers in Occitanie 201
- Education providers in Nouvelle-Aquitaine 173
- Education providers in the Hauts-de-Seine department 159
- Education providers in the Rhône department 154
- Education providers in Hauts-de-France 148
- Education providers in Pays de la Loire 143
- Education providers in the Bouches-du-Rhône department 119
- Education providers in Brittany 112
- Education providers in the Nord department 103
- Education providers in Normandy 100
- Education providers in the Haute-Garonne department 94
- Education providers in the Gironde department 80
- Education providers in the Val-de-Marne department 72
- Education providers in Bourgogne-Franche-Comté 69
- Education providers in the Seine-Saint-Denis department 69
- Education providers in the Loire-Atlantique department 68
- Education providers in the Hérault department 61
- Education providers in Paris 812
- Education providers in Lyon 107
- Education providers in Toulouse 67