The Yvelines department hosts a concentration of companies primarily focused on the aerospace, defense, and related engineering sectors. These range from large established groups such as ArianeGroup, which designs and operates space launch systems, and KNDS France, a producer of armored vehicles, to mid-sized firms like LGM, specializing in engineering consulting, and Safran Landing Systems, which provides landing gear systems. The region also features companies like Arquus, a supplier of ground military vehicles, and SOURIAU-SUNBANK Connection Technologies, an intelligent power management company.
A notable pattern among these companies is the strong presence of firms involved in critical systems and advanced technology. Many are headquartered in Versailles and Vélizy-Villacoublay, indicating a geographical cluster within the department. The list includes companies founded across several decades, from Heli-Union (1961) to SIMMT (2010), reflecting a sustained history of industrial activity in these specialized fields.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
ArianeGroupariane.group
Designing, developing, manufacturing, and operating space launch systems and strategic missiles for space and defense sectors. |
6,651 | |||
| 2 |
KNDS Franceknds.com
Designing, developing, producing armored vehicles, artillery, guns, turrets, ammunition, and robotic systems, with customer support, for armed forces land combat challenges. |
2,894 | |||
| 3 | 
Safran Landing Systemssafran-group.com
Specializes in landing gear systems, providing innovative solutions for aircraft safety, performance, and maintenance in both commercial and military sectors. |
1,717 | |||
| 4 | 1,469 | ||||
| 5 |
Arquusarquus-defense.com
Leading supplier of ground military vehicles to the French army, combining expertise from Renault Trucks Defense, ACMAT, and Panhard, with 130 years of automotive history. |
1,309 | |||
| 6 |
SOURIAU-SUNBANK Connection Technologies by Eatonsouriau.com
An intelligent power management company focused on improving quality of life, protecting the environment, and helping customers manage power efficiently |
965 | |||
| 7 |
Eiffage Métaleiffagemetal.com
Specializing in turnkey metal construction, Eiffage Métal designs and builds building envelopes, facades, and complex multi-technical projects, with a focus on industrial and wind energy sectors |
607 | |||
| 8 |
Ineo Defense
Provides technological solutions and services for defense and security, covering critical communications, electronic warfare, operational system protection, and site surveillance. |
355 | |||
| 9 |
Airbus Defence and Space Cybercyber.airbus.com
Designing, developing, integrating, and deploying reliable cyber security solutions for defense, governmental, and institutional customers, leveraging 30 years of expertise. |
308 | |||
| 10 |
Heli-Unionheli-union.com
Provides helicopter operations, including commercial air transportation for oil and gas, industrial maintenance, and pilot training for novice and experienced pilots. |
282 | |||
| 11 |
ARIANESPACEarianespace.com
Provides space transport solutions, delivering satellites to orbit for scientific, communication, navigation, and other essential applications worldwide using Ariane 6 launcher. |
268 | |||
| 12 |
3D PLUS3d-plus.com
Development and manufacturing of miniaturized electronic modules for space applications, including memory, power, cameras, and custom SiP solutions. |
220 | |||
| 13 |
SIMMT - Structure Intégrée du Maintien en condition opérationnelle des Matériels Terrestresterre.defense.gouv.fr
Manages operational maintenance for land equipment, ensuring availability for military operations, cost coherence, and logistics for army, directorates, and services. |
219 | |||
| 14 |
Médiane Systèmemedianesysteme.com
Specializes in custom secure real-time operating systems, private 5G networks, embedded AI, cybersecurity, and industrial network solutions. |
213 | |||
| 15 |
ERCOMthalesgroup.com
Provides cutting-edge cybersecurity and communication network solutions, including certified secure mobile communication, end-to-end encrypted data sharing, and secure messaging applications for professionals. |
170 | |||
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 |
Pyroalliancepyroalliance.ariane.group
manufacture advanced pyrotechnic and mechanical equipment for aerospace, defense, and energy industries, ensuring high performance and reliability |
166 | |||
| 17 |
SiPearlsipearl.com
Designs energy-efficient CPUs for supercomputers, AI, and data centers. These CPUs address security, defense, medical, energy, and climate challenges with reduced environmental impact. |
160 | |||
| 18 |
Digital Product Simulationdps-fr.com
Specializes in integrating simulation and analysis into industrial product design, offering consulting, training, and software development services worldwide. |
149 | |||
| 19 |
LGM Ingénierielgm.group
Experts in embedded electronics, test equipment, and embedded networks for major industrial players in aeronautics, defense, rail, and automotive sectors. |
135 | |||
| 20 |
SBG Systemssbg-systems.com
Manufactures inertial measurement systems from miniature to high accuracy. Products are ideal for industrial, defense, and research projects, including unmanned vehicle guidance and surveying. |
124 | |||
| 21 |
Proenginproengin.com
Specializing in chemical and biological detection systems utilizing AP4C core technology for fast, precise identification of hazardous materials for various industries worldwide |
114 | |||
| 22 |
Socitecsocitec.com
A global leader providing shock and vibration isolation solutions to various industries, with offices in France, UK, Germany, China, Tunisia, and the US |
96 | |||
| 23 |
ATERMESatermes.fr
Provider of defense solutions with expertise in defense industry standards, quality assurance systems, on-board installation, and armament quality assurance compliance since 1989 |
91 | |||
| 24 |
4DConcept4dconcept.fr
Specializing in content and editorial engineering, 4D CONCEPT provides tailored solutions for digital content production, publishing, archiving across various industries |
74 | |||
| 25 |
ASTONFLYastonfly.com
A company initially focused on pilot training, now offers aircraft management, private jet operations, and aircraft maintenance services Established expertise and reference in the industry |
73 | |||
| 26 |
Groupe Genarisgenaris.fr
Specializes in electrical and electronic design, prototyping, and manufacturing with integrated product development for defense, mobility, and industry sectors. |
71 | |||
| 27 |
GDI simulationgdi-simulation.fr
Development of immersive virtual and live outdoor simulators for military training, including weapon firing, tactical scenarios, and precision shooting exercises. |
66 | |||
| 28 |
Bronzavia Industriebronzavia.com
Specialized in manufacturing high-technology welded and mechanical assemblies for aerospace, space, and defense industries based in Yvelines. |
58 | |||
| 29 | 58 | ||||
| 30 |
ISD-SAisd-sa.com
Provides support services for industrial manufacturers in the defense sector, creating support systems, technical publications, maintenance plans, and offering technical assistance globally. |
43 | |||
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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 14, 2026.
More company lists in the Yvelines department
- The largest companies in the Yvelines department 1,469
- Multinational companies in the Yvelines department 226
- Companies with in-house R&D in the Yvelines department 160
- IT services companies in the Yvelines department 121
- IT Services and IT Consulting companies in the Yvelines department 118
- Manufacturers in the Yvelines department 109
- Professional services firms in the Yvelines department 108
- Hardware manufacturers in the Yvelines department 106
- Distributors and wholesalers in the Yvelines department 91
- Retail chains in the Yvelines department 89
- Consulting firms in the Yvelines department 72
- Public sector organisations in the Yvelines department 65
- Software Development companies in the Yvelines department 56
- Business Consulting and Services companies in the Yvelines department 53
- Government Administration companies in the Yvelines department 51
- Construction companies in the Yvelines department 50
- Automotive manufacturers and suppliers in the Yvelines department 49
- Motor Vehicle Manufacturing companies in the Yvelines department 49
- SaaS companies in the Yvelines department 49
- Education providers in the Yvelines department 46
- Industrial Machinery Manufacturing companies in the Yvelines department 43
- Critical infrastructure operators in the Yvelines department 41
- Family-owned companies in the Yvelines department 36
- Environmental services companies in the Yvelines department 35
The same list elsewhere in France
- Aerospace and defence companies in France 1,572
- Aerospace and defence companies in Île-de-France 409
- Aerospace and defence companies in Occitanie 278
- Aerospace and defence companies in Auvergne-Rhône-Alpes 200
- Aerospace and defence companies in the Haute-Garonne department 186
- Aerospace and defence companies in Nouvelle-Aquitaine 135
- Aerospace and defence companies in Provence-Alpes-Côte d'Azur 116
- Aerospace and defence companies in Grand Est 98
- Aerospace and defence companies in the Essonne department 65
- Aerospace and defence companies in Brittany 63
- Aerospace and defence companies in Pays de la Loire 63
- Aerospace and defence companies in the Bouches-du-Rhône department 61
- Aerospace and defence companies in the Hauts-de-Seine department 56
- Aerospace and defence companies in Centre-Val de Loire 53
- Aerospace and defence companies in the Gironde department 51
- Aerospace and defence companies in Bourgogne-Franche-Comté 50
- Aerospace and defence companies in Hauts-de-France 40
- Aerospace and defence companies in the Rhône department 37
- Aerospace and defence companies in Normandy 36
- Aerospace and defence companies in the Haute-Savoie department 35
- Aerospace and defence companies in the Val-d'Oise department 31
- Aerospace and defence companies in the Var department 30
- Aerospace and defence companies in Paris 117
- Aerospace and defence companies in Toulouse 94