# List of aerospace and defence companies in the Essonne department
Tamtam tracks 65 aerospace and defence companies headquartered in the Essonne department. This list ranks the 30 largest by number of employees on LinkedIn, led by ONERA - The French Aerospace Lab, TechnicAtome and Vernet Group. Their median headcount is 62. Half of them were founded in 1986 or later. The most common headquarters are Les Ulis (4), Palaiseau (4) and Massy (3).
The Essonne department hosts a concentration of companies primarily focused on aerospace and defense, alongside general engineering and industrial manufacturing. These firms range from established research institutions and mid-sized manufacturers to younger companies specializing in niche technologies. Notable examples include ONERA, which conducts aerospace and defense research; TechnicAtome, a specialist in compact nuclear reactor design; and Exotrail, which develops propulsion systems for space mobility. The presence of companies like UMS, manufacturing RF and millimeter-wave integrated circuits, and Sofradir, designing infrared technologies, highlights a strong specialization in advanced electronics and components.
A clear pattern among these companies is their deep involvement in high-technology manufacturing and engineering services, particularly for demanding sectors. Many of them are based in cities like Palaiseau, Les Ulis, and Massy, forming a cluster of expertise in the region. The founding dates vary, indicating a mix of long-standing players and more recent ventures, all contributing to the aerospace and defense supply chain.
馃嚝馃嚪 Essonne 路 30 companies 路 Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [ONERA - The French Aerospace Lab](https://www.tamtam.ai/c/onera-the-french-aerospace-lab) (onera.fr)
Researching future aerospace and defense challenges, contributing to industry competitiveness through expertise in all related disciplines and technologies. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Palaiseau | 2,097 | 1946 |
| 2 | [TechnicAtome](https://www.tamtam.ai/c/technicatome) (technicatome.com)
Specialized in compact nuclear reactor design, construction, and maintenance for various sectors including naval propulsion, research, medicine, and energy | Defense and Space Manufacturing | 馃嚝馃嚪 Villiers-le-B芒cle | 1,467 | 1972 |
| 3 | [Vernet Group](https://www.tamtam.ai/c/vernet-group) (vernet-group.com)
Family company, world leader in thermal regulation, designing and manufacturing thermostats and thermostatic elements for automotive, heating, and plumbing industries. | Mechanical Or Industrial Engineering | 馃嚝馃嚪 Ollainville | 418 | 1927 |
| 4 | [NBTECH](https://www.tamtam.ai/c/nbtech) (nbtech.fr)
Technical studies, technology consulting, and industrial engineering services for automotive, aerospace, railway, and industrial maintenance sectors across France. | Engineering Services | 馃嚝馃嚪 Les Ulis | 244 | 2014 |
| 5 | [Exotrail](https://www.tamtam.ai/c/exotrail) (exotrail.com)
Develops and operates propulsion systems, mission simulation software, and orbital transfer vehicles for efficient, sustainable space mobility, enabling telecommunication, Earth observation, space exploration. | Defense and Space Manufacturing | 馃嚝馃嚪 Massy | 215 | 2015 |
| 6 | [UMS - United Monolithic Semiconductors](https://www.tamtam.ai/c/ums-united-monolithic-semiconductors) (ums-rf.com)
Designs and manufactures GaAs and GaN based RF and millimeter-wave integrated circuits and provides advanced foundry services for critical applications. | Semiconductor Manufacturing | 馃嚝馃嚪 Villebon-sur-Yvette | 210 | 1996 |
| 7 | [Archos](https://www.tamtam.ai/c/archos) (archos.com)
A pioneering consumer electronics company based in France, known for innovation in mobile solutions, AI, blockchains, and IoT networks | Computers and Electronics Manufacturing | 馃嚝馃嚪 Igny | 170 | 1988 |
| 8 | [Composite Industrie S.A.](https://www.tamtam.ai/c/composite-industrie-s-a) (composite-industrie.com)
Specializes in manufacturing and repairing composite and hybrid metal-composite parts for aerospace, military, telecom, and transportation industries worldwide. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Bondoufle | 128 | 1983 |
| 9 | [Supratec](https://www.tamtam.ai/c/supratec) (supratec.fr)
Development of integrated automation technologies and services to optimize manufacturing processes in preparation, handling, assembly, and product control sectors. | Industrial Machinery Manufacturing | 馃嚝馃嚪 Bondoufle | 125 | 1962 |
| 10 | [Sofradir](https://www.tamtam.ai/c/sofradir) (lynred.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. | Defense and Space Manufacturing | 馃嚝馃嚪 Palaiseau | 123 | 1986 |
| 11 | [Exens Group](https://www.tamtam.ai/c/exens-group) (exens-solutions.com)
Specializing in RF and microwave electronics, this company designs and manufactures components, modules, and subsystems for various industries on a global scale | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Les Ulis | 87 | 2023 |
| 12 | [Senior Aerospace Calorstat](https://www.tamtam.ai/c/senior-aerospace-calorstat) (senior-calorstat.com)
Manufactures build-to-spec assemblies and bellows systems for aerospace, nuclear, semiconductor, and other high-tech industries, ensuring optimum performance in demanding environments. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Dourdan | 86 | 1928 |
| 13 | [Mach Aero - Groupe MinebeaMitsumi](https://www.tamtam.ai/c/mach-aero-groupe-minebeamitsumi) (machaero.com)
specialized manufacturing of spherical joint mechanical components compensating alignment variations in aircraft equipment, with operations in France and India. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Br茅tigny-sur-Orge | 73 | |
| 14 | [STAE (France)](https://www.tamtam.ai/c/stae-france) (stae.fr)
The company specializes in supporting clients in the design, industrialization, and production of highly technical technological products in various sectors | Industrial Machinery Manufacturing | 馃嚝馃嚪 Savigny-sur-Orge | 62 | 1979 |
| 15 | [ThrustMe](https://www.tamtam.ai/c/thrustme) (thrustme.fr)
Provides high-performing in-orbit mobility solutions, offering disruptive, integrated, and smart space propulsion systems for satellite constellations, including an iodine-fueled electric propulsion system. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Verri猫res-le-Buisson | 62 | 2017 |
| 16 | [NUCLETUDES](https://www.tamtam.ai/c/nucletudes) (nucletudes.ariane.group)
Specialized in engineering and testing for protection against severe radiative and electromagnetic aggressions, as a subsidiary of a global aerospace company | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Les Ulis | 61 | 1966 |
| 17 | [Mecalectro](https://www.tamtam.ai/c/mecalectro-massy) (mecalectro.com)
Design and manufacture of custom electromagnetic actuators, locks, and safety latches for aerospace, defense, medical, and other sectors. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Massy | 56 | 1948 |
| 18 | [SERM](https://www.tamtam.ai/c/serm) (serm-meca.com)
Specialized in high precision metal and plastics machining, SERM offers turnkey solutions for industries like aerospace, nuclear, and medical, with quality certified by EN 9100 and ISO 9001 | Industrial Machinery Manufacturing | 馃嚝馃嚪 Le Coudray-Montceaux | 56 | 1962 |
| 19 | [PROTECTIC](https://www.tamtam.ai/c/protectic) (protectic.fr)
Engineering company, intervening in large-scale industrial projects (aeronautics, space, defense, energy, transport). Accompanying major industrial players in product development. | IT Services and IT Consulting | 馃嚝馃嚪 Bi猫vres | 50 | 1983 |
| 20 | [GACI Technologies](https://www.tamtam.ai/c/gaci-technologies) (gaci.fr)
Wholesale company operating from Villebon sur Yvette, France, specializing in distribution and supply of various products to retailers. | Computers and Electronics Manufacturing | 馃嚝馃嚪 Villebon-sur-Yvette | 48 | 1992 |
| 21 | [BERNIER Connect](https://www.tamtam.ai/c/bernier-connect) (bernier.tm.fr)
Specializing in designing and manufacturing connectors tailored for challenging environments, ensuring reliable connectivity in harsh conditions | Appliances, Electrical, and Electronics Manufacturing | 馃嚝馃嚪 Saint-Michel-sur-Orge | 44 | |
| 22 | [STYREL](https://www.tamtam.ai/c/styrel) (styrel.fr)
Engineering and training services specializing in industrial IT, embedded real-time computing, custom industrial PCs, test benches, and complete system integration. | Software Development | 馃嚝馃嚪 Le Plessis-P芒t茅 | 41 | 1984 |
| 23 | [SEDI-ATI by Fiber Optics Group](https://www.tamtam.ai/c/sedi-ati-by-fiber-optics-group) (sedi-ati.com)
Design and manufacture optical fiber solutions for extreme environments, including high temperature, pressure, radiation, and specialized industrial and medical applications. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 脡vry-Courcouronnes | 41 | 1951 |
| 24 | [Hologarde](https://www.tamtam.ai/c/hologarde) (hologarde.com)
Unique global integrated solution for drone detection, threat neutralization, and collaborative drone management for enhanced security. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Paray-Vieille-Poste | 41 | 2017 |
| 25 | [mirSense](https://www.tamtam.ai/c/mirsense) (mirsense.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 | Semiconductor Manufacturing | 馃嚝馃嚪 Palaiseau | 36 | 2015 |
| 26 | [SpaceDreamS](https://www.tamtam.ai/c/spacedreams) (spacedreams.com)
Provides turnkey ground segment solutions, operational maintenance, launch services, and digital twins using modular, interoperable systems to reduce costs for European spaceports. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Massy | 36 | 2021 |
| 27 | [CS鲁 - Centre Spatial de CentraleSup茅lec pour les CubeSats](https://www.tamtam.ai/c/cs-centre-spatial-de-centralesupelec-pour-les-cubesats) (facebook.com)
A student space center focused on developing CubeSat platforms for educational and research purposes | Defense and Space Manufacturing | 馃嚝馃嚪 Gif-sur-Yvette | 32 | 2018 |
| 28 | [HyLight](https://www.tamtam.ai/c/hylight) (hylight.aero)
HyLight develops drones for eco-friendly inspections of gas infrastructure and power lines to prevent environmental harm, aiming to revolutionize aerial data collection | Data Infrastructure and Analytics | 馃嚝馃嚪 Le Plessis-P芒t茅 | 31 | 2022 |
| 29 | [Noxant, an Exosens company](https://www.tamtam.ai/c/noxant-an-exosens-company) (noxant.com)
Experts in optronic systems, designs and develops revolutionary vision solutions for industrial and surveillance applications. Innovative vision technology for high-performance systems. | Appliances, Electrical, and Electronics Manufacturing | 馃嚝馃嚪 Palaiseau | 29 | |
| 30 | [Elynxo](https://www.tamtam.ai/c/elynxo) (elynxo.fr)
Specializing in optronic equipment, Elynxo designs, manufactures, and maintains products for defense, security, and industrial sectors with advanced technologies and precision machining capabilities | Defense and Space Manufacturing | 馃嚝馃嚪 Les Ulis | 28 | 1987 |
## 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 12, 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)
- [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)
- [Research Services companies in the Essonne department](https://www.tamtam.ai/l/research-services-companies-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
- [Aerospace and defence companies in France](https://www.tamtam.ai/l/aerospace-and-defense-companies-france) (1,572)
- [Aerospace and defence companies in 脦le-de-France](https://www.tamtam.ai/l/aerospace-and-defense-companies-ile-de-france) (409)
- [Aerospace and defence companies in Occitanie](https://www.tamtam.ai/l/aerospace-and-defense-companies-occitanie) (278)
- [Aerospace and defence companies in Auvergne-Rh么ne-Alpes](https://www.tamtam.ai/l/aerospace-and-defense-companies-auvergne-rhone-alpes) (200)
- [Aerospace and defence companies in the Haute-Garonne department](https://www.tamtam.ai/l/aerospace-and-defense-companies-haute-garonne) (186)
- [Aerospace and defence companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/aerospace-and-defense-companies-nouvelle-aquitaine) (135)
- [Aerospace and defence companies in Provence-Alpes-C么te d'Azur](https://www.tamtam.ai/l/aerospace-and-defense-companies-provence-alpes-cote-dazur) (116)
- [Aerospace and defence companies in Grand Est](https://www.tamtam.ai/l/aerospace-and-defense-companies-grand-est) (98)
- [Aerospace and defence companies in the Yvelines department](https://www.tamtam.ai/l/aerospace-and-defense-companies-yvelines) (65)
- [Aerospace and defence companies in Brittany](https://www.tamtam.ai/l/aerospace-and-defense-companies-brittany) (63)
- [Aerospace and defence companies in Pays de la Loire](https://www.tamtam.ai/l/aerospace-and-defense-companies-pays-de-la-loire) (63)
- [Aerospace and defence companies in the Bouches-du-Rh么ne department](https://www.tamtam.ai/l/aerospace-and-defense-companies-bouches-du-rhone) (61)
- [Aerospace and defence companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/aerospace-and-defense-companies-hauts-de-seine) (56)
- [Aerospace and defence companies in Centre-Val de Loire](https://www.tamtam.ai/l/aerospace-and-defense-companies-centre-val-de-loire) (53)
- [Aerospace and defence companies in the Gironde department](https://www.tamtam.ai/l/aerospace-and-defense-companies-gironde) (51)
- [Aerospace and defence companies in Bourgogne-Franche-Comt茅](https://www.tamtam.ai/l/aerospace-and-defense-companies-bourgogne-franche-comte) (50)
- [Aerospace and defence companies in Hauts-de-France](https://www.tamtam.ai/l/aerospace-and-defense-companies-hauts-de-france) (40)
- [Aerospace and defence companies in the Rh么ne department](https://www.tamtam.ai/l/aerospace-and-defense-companies-rhone) (37)
- [Aerospace and defence companies in Normandy](https://www.tamtam.ai/l/aerospace-and-defense-companies-normandy) (36)
- [Aerospace and defence companies in the Haute-Savoie department](https://www.tamtam.ai/l/aerospace-and-defense-companies-haute-savoie) (35)
- [Aerospace and defence companies in the Val-d'Oise department](https://www.tamtam.ai/l/aerospace-and-defense-companies-val-doise) (31)
- [Aerospace and defence companies in the Var department](https://www.tamtam.ai/l/aerospace-and-defense-companies-var) (30)
- [Aerospace and defence companies in Paris](https://www.tamtam.ai/l/aerospace-and-defense-companies-paris) (117)
- [Aerospace and defence companies in Toulouse](https://www.tamtam.ai/l/aerospace-and-defense-companies-toulouse) (94)
## The same list elsewhere
- [Aerospace and defence companies in the world](https://www.tamtam.ai/l/aerospace-and-defense-companies-in-the-world) (6,084)
- [Aerospace and defence companies in Europe](https://www.tamtam.ai/l/aerospace-and-defense-companies-in-europe) (3,287)
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Source: https://www.tamtam.ai/l/aerospace-and-defense-companies-essonne