These companies in Essonne are primarily engaged in electronics and semiconductor manufacturing, spanning a range of activities from scientific instrumentation to quantum computing. The list includes established players and younger firms, reflecting a mix of industries within the broader tech sector. Companies like HORIBA France (measuring and control instruments) and L-Acoustics (professional sound solutions) represent more traditional electronics, while Pasqal and Quandela specialize in advanced quantum technologies.
The data shows a strong concentration of headquarters in the Palaiseau area, with several companies like HORIBA France, Pasqal, Sofradir, and III-V Lab located there. This suggests a regional hub for research and development in high-tech fields, particularly in semiconductor and quantum technologies. UMS - United Monolithic Semiconductors, founded in 1996, designs and manufactures GaAs and GaN based RF and millimeter-wave integrated circuits.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
HORIBA Francehoriba.com
HORIBA France manufactures instruments to help individuals tackle all their challenges |
2,200 | |||
| 2 |
L-Acousticsl-acoustics.com
Leading manufacturer of professional sound solutions founded in 1984 near Paris, with presence in over 80 countries and specializing in modern line array technology and multichannel sound systems |
700 | |||
| 3 |
Pasqalpasqal.com
The company specializes in building programmable quantum simulators and computers using neutral atoms in optical tweezers for quantum information processing |
297 | |||
| 4 |
UMS - United Monolithic Semiconductorsums-rf.com
Designs and manufactures GaAs and GaN based RF and millimeter-wave integrated circuits and provides advanced foundry services for critical applications. |
210 | |||
| 5 |
Archosarchos.com
A pioneering consumer electronics company based in France, known for innovation in mobile solutions, AI, blockchains, and IoT networks |
170 | |||
| 6 |
Quandelaquandela.com
Specializing in photon-based quantum computing and cloud solutions to assist organizations in achieving quantum transformation |
157 | |||
| 7 |
Sofradirlynred.com
Designs and manufactures high-quality infrared technologies for aerospace, defense, and commercial markets, including infrared detectors for military programs and commercial thermal imaging equipment. |
123 | |||
| 8 |
3SP Technologies S.A.S.3sptechnologies.com
Specializes in designing and manufacturing optical semiconductor components, providing advanced laser technology solutions for global industries. |
113 | |||
| 9 |
Exens Groupexens-solutions.com
Specializing in RF and microwave electronics, this company designs and manufactures components, modules, and subsystems for various industries on a global scale |
87 | |||
| 10 |
STAE (France)stae.fr
The company specializes in supporting clients in the design, industrialization, and production of highly technical technological products in various sectors |
62 | |||
| 11 |
Imagine Opticimagine-optic.com
Development and manufacturing of advanced wavefront sensing and adaptive optics technologies for research and industrial applications worldwide. |
62 | |||
| 12 | 60 | ||||
| 13 | 52 | ||||
| 14 |
FAAR-PRONERGYfaar-pronergy.com
Develops and produces embedded electronics and power electric solutions for eco-mobility, including autonomous driving kits, energy hubs, and complex system architectures, from specification to production. |
49 | |||
| 15 |
Hamamatsu Photonics Francehamamatsu.com
Manufactures optoelectronic components, modules, and systems covering the entire optical spectrum for demanding applications in medical, automotive, science, environmental, analytical, and industrial processes. |
49 | |||
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 |
GACI Technologiesgaci.fr
Wholesale company operating from Villebon sur Yvette, France, specializing in distribution and supply of various products to retailers. |
48 | |||
| 17 |
EFFILUXeffilux.com
Global leader in LED light systems for industrial environments, offering plug and play products and custom solutions with a focus on sustainability and customer satisfaction |
47 | |||
| 18 | 41 | ||||
| 19 |
SEDI-ATI by Fiber Optics Groupsedi-ati.com
Design and manufacture optical fiber solutions for extreme environments, including high temperature, pressure, radiation, and specialized industrial and medical applications. |
41 | |||
| 20 |
Sensomesensome.com
Innovative start-up developing remote monitoring technology to transform invasive medical devices into connected healthcare devices EN ISO 13485:2016 certified |
40 | |||
| 21 |
NcodiNncodin.com
Development of ultra-fast, energy-efficient optical interconnects using the world鈥檚 smallest silicon-integrated laser for advanced AI hardware. |
38 | |||
| 22 |
mirSensemirsense.com
A French high tech company specializing in QCL-based solutions for defense, security, industry/environment markets, offering DFB, high-power lasers, and OEM gas analyzers |
36 | |||
| 23 |
New Imaging Technologies (NIT)new-imaging-technologies.com
Design and manufacture of advanced SWIR InGaAs sensors and cameras with in-house hybridization and read-out circuit technologies. |
29 | |||
| 24 |
Noxant, an Exosens companynoxant.com
Experts in optronic systems, designs and develops revolutionary vision solutions for industrial and surveillance applications. Innovative vision technology for high-performance systems. |
29 | |||
| 25 |
TECHWAY Electronics COTStechway.com
Techway specializes in developing FPGA-based signal and image processing systems since 2003, aiming to simplify complex technology and deliver advanced yet affordable solutions |
18 | |||
| 26 |
Weerocweeroc.com
Designs and supplies analogue and mixed ASICs for industrial applications including medical imaging, homeland security, nuclear protection, scientific instruments, and space. |
16 | |||
| 27 |
PULSONICpulsonic.com
Global provider of meteorological products & solutions for climatology, aeronautics, environment, industry, and agriculture Specializing in sensors, weather stations, networks, software, and crop solutions |
15 | |||
| 28 |
Cobham Microwavecobhameee.com
Design and manufacture microwave components and systems for space, defense, security, industrial, scientific, and medical applications worldwide. |
14 | |||
| 29 |
Synopsis Corporation Groupsynopsisgroup.com
Innovative solutions for RF and real-time applications up to 100 GHz, with expertise in military and telecommunications operations Design, develop, and manufacture integrated systems |
14 | |||
| 30 | 13 | ||||
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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
- 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
- Education providers in the Essonne department 30
The same list elsewhere in France
- Electronics and semiconductor companies in France 846
- Electronics and semiconductor companies in 脦le-de-France 230
- Electronics and semiconductor companies in Auvergne-Rh么ne-Alpes 154
- Electronics and semiconductor companies in Occitanie 89
- Electronics and semiconductor companies in Provence-Alpes-C么te d'Azur 79
- Electronics and semiconductor companies in the Is猫re department 70
- Electronics and semiconductor companies in Grand Est 56
- Electronics and semiconductor companies in Nouvelle-Aquitaine 53
- Electronics and semiconductor companies in the Haute-Garonne department 49
- Electronics and semiconductor companies in the Bouches-du-Rh么ne department 45
- Electronics and semiconductor companies in Brittany 38
- Electronics and semiconductor companies in Pays de la Loire 38
- Electronics and semiconductor companies in the Hauts-de-Seine department 35
- Electronics and semiconductor companies in the Gironde department 32
- Electronics and semiconductor companies in Hauts-de-France 27
- Electronics and semiconductor companies in the Yvelines department 26
- Electronics and semiconductor companies in the Rh么ne department 25
- Electronics and semiconductor companies in Paris 54
- Electronics and semiconductor companies in Grenoble 28