The companies with in-house R&D in Massy are primarily mid-sized firms in software development, manufacturing, and specialized industrial services. Noteworthy examples include Réseau DEF, an international network for fire safety systems; Orano DS, providing nuclear expertise; Infovista, which optimizes network performance; and Horoquartz, offering workforce management solutions. MyUnisoft develops accounting platforms, while Exotrail focuses on space mobility systems.
A significant cluster of these companies operates in software development, with firms like Infovista, Horoquartz, MyUnisoft, and CODRA all headquartered in Massy. This concentration suggests a local specialization in digital solutions, alongside a strong presence in industrial and high-tech manufacturing.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Réseau DEFreseau-def.com
International network of expert companies providing detection, extinguishing, smoke extraction, and exit management systems through manufacturing and research facilities across several countries. |
3,484 | |||
| 2 |
Orano DSorano.group
Provides expertise and solutions to nuclear operators in industrial logistics, specialized maintenance, radiological safety, decommissioning, and waste management. |
2,118 | |||
| 3 |
Infovistainfovista.com
Empowers service providers and enterprises with data-driven solutions for optimizing network performance, enhancing customer experience, and driving business success. |
834 | |||
| 4 |
Horoquartzhoroquartz.com
Provides integrated solutions for workforce management, planning optimization, activity tracking, access control, and identity management, serving over 5000 clients globally. |
568 | |||
| 5 | 242 | ||||
| 6 |
Exotrailexotrail.com
Develops and operates propulsion systems, mission simulation software, and orbital transfer vehicles for efficient, sustainable space mobility, enabling telecommunication, Earth observation, space exploration. |
215 | |||
| 7 |
ADALTRAadaltra.fr
Specializing in communication systems for various environments such as offices, hotels, hospitals, airports, stadiums, and more, our solutions are designed by CAE GROUPE |
182 | |||
| 8 | 181 | ||||
| 9 |
Quandelaquandela.com
Specializing in photon-based quantum computing and cloud solutions to assist organizations in achieving quantum transformation |
157 | |||
| 10 |
iObeyaiobeya.com
Transforms physical workspaces into immersive, collaborative digital environments for sharing KPIs, plans, and ideas, fostering collective intelligence and quick decision-making. |
156 | |||
| 11 |
Löwenstein Medical Franceloewensteinmedical.com
Development and supply of reliable respiratory assistance devices for hospitals and home care, focusing on patient quality of life and support. |
72 | |||
| 12 |
Mecalectromecalectro.com
Design and manufacture of custom electromagnetic actuators, locks, and safety latches for aerospace, defense, medical, and other sectors. |
56 | |||
| 13 |
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 | |||
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| 14 |
Cuenodcuenod.com
With over 120 years of experience, this European burner manufacturer offers a wide range of environmentally-friendly heating solutions for residential, commercial, and industrial applications |
46 | |||
| 15 |
Cyberwatchcyberwatch.fr
French cybersecurity solutions provider, specializing in vulnerability and compliance management, offering penetration testing services and job opportunities. |
42 | |||
| 16 |
Sensomesensome.com
Innovative start-up developing remote monitoring technology to transform invasive medical devices into connected healthcare devices EN ISO 13485:2016 certified |
40 | |||
| 17 |
SpaceDreamSspacedreams.com
Provides turnkey ground segment solutions, operational maintenance, launch services, and digital twins using modular, interoperable systems to reduce costs for European spaceports. |
36 | |||
| 18 |
Mecalectromecalectro.com
A European leader in electromagnetic solutions, offering a wide range of products such as electromagnets, electromagnet suction cups, safety locks, and electrodynamic actuators They provide innovative and reliable solutions for demanding markets |
20 | |||
| 19 |
AEROMAPPERaeromapper.com
Designs and manufactures innovative unmanned aerial vehicles for surveillance, reconnaissance, and intelligence missions, serving both civil and military clients with high-performance, reliable solutions. |
20 | |||
| 20 |
Geoflexgeoflex.xyz
Enhances GPS/GNSS applications to 4-centimeter accuracy for trains, cars, vessels, drones, and smartphones using patented technology and experienced team. |
18 | |||
| 21 |
Cryo Purcryopur.com
Specializing in gas separation and liquefaction, the company offers innovative equipment for various applications such as biogas upgrading, CO2 capture, and natural gas microliquefaction |
11 | |||
| 22 | 10 | ||||
| 23 |
HUB Parking Technology FRhubparking.fr
Innovative parking technology company: develops, installs, and supports Parking Access and Revenue Control Systems worldwide Offers scalable solutions with remote management capabilities |
5 | |||
| 24 |
Kos lightingkoslighting.eu
A leading French company specializing in designing and manufacturing LED lighting fixtures and accessories, focused on providing innovative solutions for visual comfort and energy efficiency |
4 | |||
| 25 |
DEVERNEdeverne-france.com
Engineering firm specializing in embedded video systems, optronic solutions, and artificial intelligence for defense, mobility, surveillance, and medical diagnostics. |
4 | |||
| 26 |
MilliDropmillidrop.fr
Develops and sells microbiology systems for incubating, analyzing, and handling thousands of nanoliter-scale samples in parallel, catering to research, industrial, and diagnostic sectors |
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.
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