# Top 30 Research Services companies in the Essonne department
Tamtam tracks 35 Research Services companies headquartered in the Essonne department. This list ranks the 30 largest by number of employees on LinkedIn, led by 脡cole Polytechnique, HORIBA for Materials and CEA-List. Their median headcount is 84. Half of them were founded in 2012 or later. The most common headquarters are Palaiseau (12), Gif-sur-Yvette (6) and Orsay (4).
The companies listed are research services providers in Essonne. They are primarily large research institutions and laboratories, many of which are publicly funded or affiliated with academic bodies. Examples include 脡cole Polytechnique, a leading French institution for research and academic programs in science and technology, and HORIBA for Materials, which focuses on researching and developing new materials. CEA-List specializes in digital technology, supporting companies through expertise and collaborative projects, while Synchrotron SOLEIL provides advanced experimental facilities for material research.
These organizations are concentrated in a few key locations within Essonne. Palaiseau hosts a significant number of these entities, including Laboratoire de Physique des Plasmas, which researches space and fusion plasmas, and C2N - Centre de Nanosciences et de Nanotechnologies, dedicated to material science and nanotechnology. This geographical clustering suggests a regional hub for scientific and technological research activities.
馃嚝馃嚪 Essonne 路 30 companies 路 Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [脡cole Polytechnique](https://www.tamtam.ai/c/ecole-polytechnique) (polytechnique.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 | 馃嚝馃嚪 Palaiseau | 4,377 | 1794 |
| 2 | [HORIBA for Materials](https://www.tamtam.ai/c/horiba-for-materials) (horiba.com)
Researching, developing new materials, improving manufacturing, and implementing recycling solutions for sustainability across the material supply chain. | Research Services | 馃嚝馃嚪 Palaiseau | 1,053 | |
| 3 | [CEA-List](https://www.tamtam.ai/c/cea-list) (cea.fr)
A research institute specializing in digital technology, supporting companies in technological development through expertise, skills, patents, and collaborative projects | Research Services | 馃嚝馃嚪 Palaiseau | 456 | 2003 |
| 4 | [Synchrotron SOLEIL](https://www.tamtam.ai/c/synchrotron-soleil) (synchrotron-soleil.fr)
Third generation synchrotron providing advanced experimental facilities for material geometry and properties research, serving diverse scientific users worldwide. | Research Services | 馃嚝馃嚪 Gif-sur-Yvette | 403 | 2001 |
| 5 | [Laboratoire de Physique des Plasmas](https://www.tamtam.ai/c/laboratoire-de-physique-des-plasmas) (polytechnique.fr)
Researching space, cold, and magnetic fusion plasmas, supporting major projects like ITER, and developing plasma technologies for various applications. | Research Services | 馃嚝馃嚪 Palaiseau | 339 | 2009 |
| 6 | [C2N - Centre de Nanosciences et de Nanotechnologies](https://www.tamtam.ai/c/c2n-centre-de-nanosciences-et-de-nanotechnologies) (c2n.universite-paris-saclay.fr)
Research in material science, nanophotonics, nanoelectronics, nanobiotechnologies, microsystems, fundamental and applied nanotechnology science. | Research Services | 馃嚝馃嚪 Palaiseau | 225 | 2016 |
| 7 | [IJCLab](https://www.tamtam.ai/c/ijclab) (ijclab.in2p3.fr)
A leading physics research laboratory focused on the physics of astroparticles, energy, environment, and high-energy particles, with impressive scientific departments and technological capabilities | Research Services | 馃嚝馃嚪 Orsay | 171 | 2020 |
| 8 | [CNRS 脿 Paris-Saclay](https://www.tamtam.ai/c/cnrs-a-paris-saclay) (iledefrance-gif.cnrs.fr)
A leading public research institution in Paris-Saclay, conducting fundamental research with societal, industrial, environmental applications through the work of 3300 scientists | Research Services | 馃嚝馃嚪 Gif-sur-Yvette | 165 | 1939 |
| 9 | [LISN - Laboratoire Interdisciplinaire des Sciences du Num茅rique](https://www.tamtam.ai/c/lisn-laboratoire-interdisciplinaire-des-sciences-du-numerique) (lisn.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 | 馃嚝馃嚪 Orsay | 163 | 2021 |
| 10 | [IRT SystemX](https://www.tamtam.ai/c/irt-systemx) (irt-systemx.fr)
Research institute focused on digital engineering for future systems, covering agile industry, autonomous transport, smart territories, and trusted internet solutions. | Research Services | 馃嚝馃嚪 Palaiseau | 142 | 2012 |
| 11 | [Laboratoire des Sciences du Climat et de l'Environnement](https://www.tamtam.ai/c/laboratoire-des-sciences-du-climat-et-de-l-environnement) (lsce.ipsl.fr)
A leading research institute focusing on understanding natural and human-induced climate and environmental variations through national and international projects | Research Services | 馃嚝馃嚪 Gif-sur-Yvette | 120 | |
| 12 | [CEA ISAS](https://www.tamtam.ai/c/cea-isas) (cea.fr)
Develops predictive science for low-carbon energy through experimentation, modeling, and simulation across materials, chemistry, mechanics, thermohydraulics, neutronics, and analytical sciences. | Research Services | 馃嚝馃嚪 Gif-sur-Yvette | 115 | 2020 |
| 13 | [Institut Photovolta茂que d'Ile-de-France (IPVF)](https://www.tamtam.ai/c/institut-photovoltaique-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 | 馃嚝馃嚪 Palaiseau | 103 | 2014 |
| 14 | [CREST - Center for Research in Economics and Statistics](https://www.tamtam.ai/c/crest-center-for-research-in-economics-and-statistics) (crest.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 | 馃嚝馃嚪 Palaiseau | 89 | |
| 15 | [CERC (Cardiovascular European Research Center)](https://www.tamtam.ai/c/cerc-cardiovascular-european-research-center) (cerc-europe.org)
A leading European CRO founded by experienced physicians, specializing in clinical research, innovative techniques, and supporting young scientific leaders globally | Research Services | 馃嚝馃嚪 Massy | 84 | 2008 |
| 16 | [Laboratory of Mechanics Paris-Saclay](https://www.tamtam.ai/c/laboratory-of-mechanics-paris-saclay) (lmps.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 | 馃嚝馃嚪 Gif-sur-Yvette | 79 | 1975 |
| 17 | [Laboratoire Albert Fert](https://www.tamtam.ai/c/laboratoire-albert-fert) (laboratoire-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 | 馃嚝馃嚪 Palaiseau | 71 | 1995 |
| 18 | [SATT Paris-Saclay](https://www.tamtam.ai/c/satt-paris-saclay) (satt-paris-saclay.fr)
Funding and supporting research valorization and technology transfer from Paris-Saclay academic institutions to market applications with significant investment. | Research Services | 馃嚝馃嚪 Orsay | 65 | 2014 |
| 19 | [III-V Lab](https://www.tamtam.ai/c/iii-v-lab) (3-5lab.fr)
A private R&D organization specializing in III-V semiconductors, offering pre-commercial production of components, epitaxy wafers, and innovative technology development | Research Services | 馃嚝馃嚪 Palaiseau | 60 | 2004 |
| 20 | [TECHNOSOL - Groupe Gengis](https://www.tamtam.ai/c/technosol-groupe-gengis) (technosol-gengis.fr)
TECHNOSOL is a geotechnical engineering firm part of GENGIS Group, specializing in geosciences and structures, with a team of 25+ engineers and 90 employees | Research Services | 馃嚝馃嚪 Ballainvilliers | 57 | |
| 21 | [CENTRE BORELLI](https://www.tamtam.ai/c/centre-borelli) (centreborelli.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 | 馃嚝馃嚪 Gif-sur-Yvette | 37 | 2020 |
| 22 | [Eurofins BIO-EC](https://www.tamtam.ai/c/eurofins-bio-ec) (bio-ec.fr)
Specializing in evaluating cosmetic, dermatological products, medical devices, and supplements through ex vivo and in vivo studies, absorption analysis, spectroscopy, and Cosmetogenomics Contact for personalized studies | Research Services | 馃嚝馃嚪 Longjumeau | 33 | 1998 |
| 23 | [LFB-BIOTECHNOLOGIES](https://www.tamtam.ai/c/lfb-biotechnologies)
LFB-BIOTECHNOLOGIES is a research company in France specializing in biotechnology, located in ZA DE COURTABOEUF LES ULIS | Research Services | 馃嚝馃嚪 Les Ulis | 26 | |
| 24 | [Laboratoire de l'Acc茅l茅rateur Lin茅aire](https://www.tamtam.ai/c/laboratoire-de-l-accelerateur-lineaire) (lal.in2p3.fr)
The company is involved in particle physics research, astroparticle physics, astrophysics, cosmology, accelerator and detector R&D with advanced techniques | Research Services | 馃嚝馃嚪 Orsay | 23 | |
| 25 | [Hi! PARIS Center - AI for Science, Business & Society](https://www.tamtam.ai/c/hi-paris-center-ai-for-science-business-and-society) (hi-paris.fr)
An interdisciplinary center focused on AI and Data Science, partnering with leading organizations to address challenges of technological transformation for society and businesses | Research Services | 馃嚝馃嚪 Palaiseau | 19 | 2020 |
| 26 | [EUROFLUX SAS](https://www.tamtam.ai/c/euroflux-sas) (euroflux.fr)
Specializing in designing and installing clean rooms and equipment for aerobiological contamination control, such as unidirectional airflow systems and air showers | Research Services | 馃嚝馃嚪 Ballainvilliers | 18 | 1989 |
| 27 | [Datastorm](https://www.tamtam.ai/c/datastorm) (datastorm.fr)
Datastorm offers data expertise and services to businesses and public organizations, combining data scientists and researchers from top institutions | Research Services | 馃嚝馃嚪 Palaiseau | 15 | 2013 |
| 28 | [A脣XOR](https://www.tamtam.ai/c/aexor) (aexor.eu)
AEXOR is an engineering firm specializing in ATEX industrial risk solutions, training, certification, chemical risk assessment, and pilot project development in various fields | Research Services | 馃嚝馃嚪 Les Ulis | 7 | 2007 |
| 29 | [Cell Environment](https://www.tamtam.ai/c/cell-environment) (cell-environment.com)
Precisely analyzing repetitive sequences and detecting chromosomal aberrations for precision medicine, diagnostics, and measuring cellular quality and aging across various fields. | Research Services | 馃嚝馃嚪 脡vry-Courcouronnes | 6 | 2016 |
| 30 | [CRESP - CH MANH脠S](https://www.tamtam.ai/c/cresp-ch-manhes) (cresp-manhes.fr)
The company is a Research Cell focused on paramedical care and health prevention, aiming to improve patient care and public health outcomes | Research Services | 馃嚝馃嚪 Fleury-M茅rogis | 5 | 2017 |
## 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](https://www.tamtam.ai/l/largest-companies-essonne) (1,149)
- [Companies with in-house R&D in the Essonne department](https://www.tamtam.ai/l/r-and-d-companies-essonne) (198)
- [Multinational companies in the Essonne department](https://www.tamtam.ai/l/multinational-companies-essonne) (156)
- [Manufacturers in the Essonne department](https://www.tamtam.ai/l/manufacturers-essonne) (127)
- [Hardware manufacturers in the Essonne department](https://www.tamtam.ai/l/hardware-companies-essonne) (114)
- [Distributors and wholesalers in the Essonne department](https://www.tamtam.ai/l/distributors-and-wholesalers-essonne) (76)
- [IT Services and IT Consulting companies in the Essonne department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-essonne) (70)
- [Professional services firms in the Essonne department](https://www.tamtam.ai/l/professional-services-firms-essonne) (68)
- [Public sector organisations in the Essonne department](https://www.tamtam.ai/l/public-sector-organisations-essonne) (66)
- [Aerospace and defence companies in the Essonne department](https://www.tamtam.ai/l/aerospace-and-defense-companies-essonne) (65)
- [IT services companies in the Essonne department](https://www.tamtam.ai/l/it-services-companies-essonne) (60)
- [Retail chains in the Essonne department](https://www.tamtam.ai/l/retail-chains-essonne) (59)
- [Construction companies in the Essonne department](https://www.tamtam.ai/l/construction-companies-essonne) (56)
- [Software Development companies in the Essonne department](https://www.tamtam.ai/l/software-development-companies-essonne) (51)
- [Pharmaceutical companies in the Essonne department](https://www.tamtam.ai/l/pharmaceutical-companies-essonne) (45)
- [Electronics and semiconductor companies in the Essonne department](https://www.tamtam.ai/l/electronics-companies-essonne) (44)
- [Research institutes in the Essonne department](https://www.tamtam.ai/l/research-institutes-essonne) (42)
- [Events Services companies in the Essonne department](https://www.tamtam.ai/l/events-services-companies-essonne) (41)
- [SaaS companies in the Essonne department](https://www.tamtam.ai/l/saas-companies-essonne) (41)
- [Consulting firms in the Essonne department](https://www.tamtam.ai/l/consulting-firms-essonne) (40)
- [Family-owned companies in the Essonne department](https://www.tamtam.ai/l/family-owned-companies-essonne) (38)
- [Contract manufacturers in the Essonne department](https://www.tamtam.ai/l/contract-manufacturers-essonne) (35)
- [Critical infrastructure operators in the Essonne department](https://www.tamtam.ai/l/critical-infrastructure-operators-essonne) (32)
- [Education providers in the Essonne department](https://www.tamtam.ai/l/education-companies-essonne) (30)
## The same list elsewhere in France
- [Research Services companies in France](https://www.tamtam.ai/l/research-services-companies-france) (745)
- [Research Services companies in 脦le-de-France](https://www.tamtam.ai/l/research-services-companies-ile-de-france) (268)
- [Research Services companies in Auvergne-Rh么ne-Alpes](https://www.tamtam.ai/l/research-services-companies-auvergne-rhone-alpes) (95)
- [Research Services companies in Provence-Alpes-C么te d'Azur](https://www.tamtam.ai/l/research-services-companies-provence-alpes-cote-dazur) (78)
- [Research Services companies in Occitanie](https://www.tamtam.ai/l/research-services-companies-occitanie) (63)
- [Research Services companies in Grand Est](https://www.tamtam.ai/l/research-services-companies-grand-est) (60)
- [Research Services companies in the Rh么ne department](https://www.tamtam.ai/l/research-services-companies-rhone) (49)
- [Research Services companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/research-services-companies-nouvelle-aquitaine) (48)
- [Research Services companies in the Bouches-du-Rh么ne department](https://www.tamtam.ai/l/research-services-companies-bouches-du-rhone) (47)
- [Research Services companies in the Haute-Garonne department](https://www.tamtam.ai/l/research-services-companies-haute-garonne) (30)
- [Research Services companies in Brittany](https://www.tamtam.ai/l/research-services-companies-brittany) (29)
- [Research Services companies in the Is猫re department](https://www.tamtam.ai/l/research-services-companies-isere) (29)
- [Research Services companies in the Gironde department](https://www.tamtam.ai/l/research-services-companies-gironde) (28)
- [Research Services companies in Hauts-de-France](https://www.tamtam.ai/l/research-services-companies-hauts-de-france) (27)
- [Research Services companies in Paris](https://www.tamtam.ai/l/research-services-companies-paris) (148)
- [Research Services companies in Marseille](https://www.tamtam.ai/l/research-services-companies-marseille) (33)
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Source: https://www.tamtam.ai/l/research-services-companies-essonne