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30 leading research institutes in the Essonne department

Tamtam tracks 42 research institutes headquartered in the Essonne department. This list ranks the 30 largest by number of employees on LinkedIn, led by École Polytechnique, CentraleSupélec and ONERA - The French Aerospace Lab. Their median headcount is 225. Half of them were founded in 2003 or later. The most common headquarters are Palaiseau (16), Gif-sur-Yvette (8) and Orsay (6).

🇫🇷 Essonne30 companiesUpdated Nov 11, 2026

The research institutes in Essonne are predominantly higher education institutions and research services, with a strong focus on science, technology, and engineering. Many are large organizations, reflecting their role in national and international research. Notable examples include École Polytechnique, a leading French institution in science and technology; CentraleSupélec, providing higher education with a large student body; ONERA - The French Aerospace Lab, researching aerospace and defense challenges; and AgroParisTech, educating professionals in life and environmental sciences.

A clear pattern is the concentration of these institutes in Palaiseau and Gif-sur-Yvette, indicating a central hub for research and higher education in the Essonne department. The founding dates range from the 18th century to the 21st century, with a cluster of institutions founded in the 21st century.

#CompanyIndustryHeadquarters EmployeesFounded
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

Research Services 🇫🇷 Palaiseau 4,377 1794
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.

Higher Education 🇫🇷 Gif-sur-Yvette 2,125 1829
3
ONERA - The French Aerospace Labonera.fr

Researching future aerospace and defense challenges, contributing to industry competitiveness through expertise in all related disciplines and technologies.

Aviation and Aerospace Component Manufacturing 🇫🇷 Palaiseau 2,097 1946
4
AgroParisTechagroparistech.fr

Educates professionals in life and environmental sciences, focusing on sustainable resource management, innovation, and bioeconomy through various academic programs.

Higher Education 🇫🇷 Palaiseau 1,093 2007
5
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

Higher Education 🇫🇷 Palaiseau 953 1878
6
ENSTAensta.fr

Leading public institution for higher education, research, and innovation. Offers engineering cycles, master's, doctorates, and specialized master's degrees for scientific and technical excellence.

Higher Education 🇫🇷 Palaiseau 916 1741
7
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

Higher Education 🇫🇷 Orsay 910 1970
8
ENS Paris-Saclayens-paris-saclay.fr

Public institution providing high-level scientific and cultural education for research, teaching, and leadership roles in various sectors.

Higher Education 🇫🇷 Gif-sur-Yvette 847 1912
9
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.

Higher Education 🇫🇷 Palaiseau 474 2012
10
CEA-Listcea.fr

A research institute specializing in digital technology, supporting companies in technological development through expertise, skills, patents, and collaborative projects

Research Services 🇫🇷 Palaiseau 456 2003
11
Synchrotron SOLEILsynchrotron-soleil.fr

Third generation synchrotron providing advanced experimental facilities for material geometry and properties research, serving diverse scientific users worldwide.

Research Services 🇫🇷 Gif-sur-Yvette 403 2001
12
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.

Higher Education 🇫🇷 Palaiseau 370 2019
13
Laboratoire de Physique des Plasmaspolytechnique.fr

Researching space, cold, and magnetic fusion plasmas, supporting major projects like ITER, and developing plasma technologies for various applications.

Research Services 🇫🇷 Palaiseau 339 2009
14
ENSAE Parisensae.fr

A leading French institution in data science, statistics, economics, finance, and actuarial science with strong links to research and industry professionals

Higher Education 🇫🇷 Palaiseau 237 1945
15
C2N - Centre de Nanosciences et de Nanotechnologiesc2n.universite-paris-saclay.fr

Research in material science, nanophotonics, nanoelectronics, nanobiotechnologies, microsystems, fundamental and applied nanotechnology science.

Research Services 🇫🇷 Palaiseau 225 2016

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16
Institut d'Optique Graduate Schoolinstitutoptique.fr

Non-profit higher education institution specializing in optics and photonics research, offering accredited Masters and PhD programs, and facilitating technology transfers in the field

Higher Education 🇫🇷 Palaiseau 202 n/a
17
LISN - Laboratoire Interdisciplinaire des Sciences du Numériquelisn.upsaclay.fr

Researching core digital sciences and engineering, including AI, data science, human-machine interaction, language processing, and bioinformatics, with a focus on interdisciplinary approaches.

Research Services 🇫🇷 Orsay 163 2021
18
IRT SystemXirt-systemx.fr

Research institute focused on digital engineering for future systems, covering agile industry, autonomous transport, smart territories, and trusted internet solutions.

Research Services 🇫🇷 Palaiseau 142 2012
19
Laboratoire des Sciences du Climat et de l'Environnementlsce.ipsl.fr

A leading research institute focusing on understanding natural and human-induced climate and environmental variations through national and international projects

Research Services 🇫🇷 Gif-sur-Yvette 120 n/a
20
CEA ISAScea.fr

Develops predictive science for low-carbon energy through experimentation, modeling, and simulation across materials, chemistry, mechanics, thermohydraulics, neutronics, and analytical sciences.

Research Services 🇫🇷 Gif-sur-Yvette 115 2020
21
Institut Photovoltaïque d'Ile-de-France (IPVF)ipvf.fr

Research and innovation services for photovoltaics, developing perovskites, III-V, tandem cells, BIPV, VIPV, agrivoltaics, IoT, and hydrogen technologies.

Research Services 🇫🇷 Palaiseau 103 2014
22
CREST - Center for Research in Economics and Statisticscrest.science

A research unit in France specializing in economics, statistics, sociology, and finance, with over 100 researchers and a focus on academic excellence

Research Services 🇫🇷 Palaiseau 89 n/a
23
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

Higher Education 🇫🇷 Orsay 84 n/a
24
Laboratory of Mechanics Paris-Saclaylmps.ens-paris-saclay.fr

Specializing in material and structural modeling, the company focuses on experimental mechanics, numerical simulation, and high-performance computing for research purposes

Research Services 🇫🇷 Gif-sur-Yvette 79 1975
25
Laboratoire Albert Fertlaboratoire-albert-fert.cnrs-thales.fr

The research laboratory specializes in various areas of condensed matter physics to develop applications and promote innovation in information and communication technologies

Research Services 🇫🇷 Palaiseau 71 1995
26
SATT Paris-Saclaysatt-paris-saclay.fr

Funding and supporting research valorization and technology transfer from Paris-Saclay academic institutions to market applications with significant investment.

Research Services 🇫🇷 Orsay 65 2014
27
CENTRE BORELLIcentreborelli.ens-paris-saclay.fr

The Borelli Center brings together researchers in mathematics, computer science, and neuroscience focused on biomedical interfaces and industrial transfer

Research Services 🇫🇷 Gif-sur-Yvette 37 2020
28
CS³ - Centre Spatial de CentraleSupélec pour les CubeSatsfacebook.com

A student space center focused on developing CubeSat platforms for educational and research purposes

Defense and Space Manufacturing 🇫🇷 Gif-sur-Yvette 32 2018
29
IDRIS (CNRS)idris.fr

National center providing high-performance computing and artificial intelligence resources and expertise to public and private scientific research communities.

IT System Operations and Maintenance 🇫🇷 Orsay 23 1993
30
Laboratoire de l'Accélérateur Linéairelal.in2p3.fr

The company is involved in particle physics research, astroparticle physics, astrophysics, cosmology, accelerator and detector R&D with advanced techniques

Research Services 🇫🇷 Orsay 23 n/a

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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.

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