# The 30 largest aerospace and defence companies in the Yvelines department
Tamtam tracks 65 aerospace and defence companies headquartered in the Yvelines department. This list ranks the 30 largest by number of employees on LinkedIn, led by ArianeGroup, KNDS France and Safran Landing Systems. Their median headcount is 170. Half of them were founded in 1989 or later. The most common headquarters are Velizy-Villacoublay (6), Versailles (5) and Montigny-le-Bretonneux (3).
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 V茅lizy-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.
馃嚝馃嚪 Yvelines 路 30 companies 路 Updated Nov 14, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [ArianeGroup](https://www.tamtam.ai/c/arianegroup) (ariane.group)
Designing, developing, manufacturing, and operating space launch systems and strategic missiles for space and defense sectors. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Les Mureaux | 6,651 | |
| 2 | [KNDS France](https://www.tamtam.ai/c/knds-france) (knds.com)
Designing, developing, producing armored vehicles, artillery, guns, turrets, ammunition, and robotic systems, with customer support, for armed forces land combat challenges. | Defense and Space Manufacturing | 馃嚝馃嚪 Versailles | 2,894 | |
| 3 | [Safran Landing Systems](https://www.tamtam.ai/c/safran-landing-systems) (safran-group.com)
Specializes in landing gear systems, providing innovative solutions for aircraft safety, performance, and maintenance in both commercial and military sectors. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Velizy-Villacoublay | 1,717 | |
| 4 | [LGM](https://www.tamtam.ai/c/lgm-velizy-villacoublay) (lgm.group)
The company offers technological, digital, and software engineering consulting, innovative solution design, and complex electronics production, supporting critical systems and industrial performance. | Engineering Services | 馃嚝馃嚪 Velizy-Villacoublay | 1,469 | 1991 |
| 5 | [Arquus](https://www.tamtam.ai/c/arquus) (arquus-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. | Defense and Space Manufacturing | 馃嚝馃嚪 Versailles | 1,309 | |
| 6 | [SOURIAU-SUNBANK Connection Technologies by Eaton](https://www.tamtam.ai/c/souriau-sunbank-connection-technologies-by-eaton) (souriau.com)
An intelligent power management company focused on improving quality of life, protecting the environment, and helping customers manage power efficiently | Appliances, Electrical, and Electronics Manufacturing | 馃嚝馃嚪 Versailles | 965 | |
| 7 | [Eiffage M茅tal](https://www.tamtam.ai/c/eiffage-metal) (eiffagemetal.com)
Specializing in turnkey metal construction, Eiffage M茅tal designs and builds building envelopes, facades, and complex multi-technical projects, with a focus on industrial and wind energy sectors | Construction | 馃嚝馃嚪 Velizy-Villacoublay | 607 | |
| 8 | [Ineo Defense](https://www.tamtam.ai/c/ineo-defense)
Provides technological solutions and services for defense and security, covering critical communications, electronic warfare, operational system protection, and site surveillance. | Defense and Space Manufacturing | 馃嚝馃嚪 Velizy-Villacoublay | 355 | |
| 9 | [Airbus Defence and Space Cyber](https://www.tamtam.ai/c/airbus-defence-and-space-cyber) (cyber.airbus.com)
Designing, developing, integrating, and deploying reliable cyber security solutions for defense, governmental, and institutional customers, leveraging 30 years of expertise. | IT Services and IT Consulting | 馃嚝馃嚪 脡lancourt | 308 | |
| 10 | [Heli-Union](https://www.tamtam.ai/c/heli-union) (heli-union.com)
Provides helicopter operations, including commercial air transportation for oil and gas, industrial maintenance, and pilot training for novice and experienced pilots. | Airlines and Aviation | 馃嚝馃嚪 Toussus-le-Noble | 282 | 1961 |
| 11 | [ARIANESPACE](https://www.tamtam.ai/c/arianespace) (arianespace.com)
Provides space transport solutions, delivering satellites to orbit for scientific, communication, navigation, and other essential applications worldwide using Ariane 6 launcher. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Les Mureaux | 268 | 1980 |
| 12 | [3D PLUS](https://www.tamtam.ai/c/3d-plus) (3d-plus.com)
Development and manufacturing of miniaturized electronic modules for space applications, including memory, power, cameras, and custom SiP solutions. | Space Research and Technology | 馃嚝馃嚪 Buc | 220 | 1995 |
| 13 | [SIMMT - Structure Int茅gr茅e du Maintien en condition op茅rationnelle des Mat茅riels Terrestres](https://www.tamtam.ai/c/simmt-structure-integree-du-maintien-en-condition-operationnelle-des-materiels) (terre.defense.gouv.fr)
Manages operational maintenance for land equipment, ensuring availability for military operations, cost coherence, and logistics for army, directorates, and services. | Armed Forces | 馃嚝馃嚪 Versailles | 219 | 2010 |
| 14 | [M茅diane Syst猫me](https://www.tamtam.ai/c/mediane-systeme) (medianesysteme.com)
Specializes in custom secure real-time operating systems, private 5G networks, embedded AI, cybersecurity, and industrial network solutions. | Software Development | 馃嚝馃嚪 Le Pecq | 213 | 1989 |
| 15 | [ERCOM](https://www.tamtam.ai/c/ercom) (thalesgroup.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. | Computer and Network Security | 馃嚝馃嚪 Velizy-Villacoublay | 170 | 1986 |
| 16 | [Pyroalliance](https://www.tamtam.ai/c/pyroalliance) (pyroalliance.ariane.group)
manufacture advanced pyrotechnic and mechanical equipment for aerospace, defense, and energy industries, ensuring high performance and reliability | Defense and Space Manufacturing | 馃嚝馃嚪 Les Mureaux | 166 | 1997 |
| 17 | [SiPearl](https://www.tamtam.ai/c/sipearl) (sipearl.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. | Semiconductor Manufacturing | 馃嚝馃嚪 Maisons-Laffitte | 160 | 2019 |
| 18 | [Digital Product Simulation](https://www.tamtam.ai/c/digital-product-simulation) (dps-fr.com)
Specializes in integrating simulation and analysis into industrial product design, offering consulting, training, and software development services worldwide. | IT Services and IT Consulting | 馃嚝馃嚪 La Celle-Saint-Cloud | 149 | 1997 |
| 19 | [LGM Ing茅nierie](https://www.tamtam.ai/c/lgm-ingenierie) (lgm.group)
Experts in embedded electronics, test equipment, and embedded networks for major industrial players in aeronautics, defense, rail, and automotive sectors. | Engineering Services | 馃嚝馃嚪 Velizy-Villacoublay | 135 | 2007 |
| 20 | [SBG Systems](https://www.tamtam.ai/c/sbg-systems) (sbg-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. | Computers and Electronics Manufacturing | 馃嚝馃嚪 Carri猫res-sur-Seine | 124 | 2007 |
| 21 | [Proengin](https://www.tamtam.ai/c/proengin) (proengin.com)
Specializing in chemical and biological detection systems utilizing AP4C core technology for fast, precise identification of hazardous materials for various industries worldwide | Defense and Space Manufacturing | 馃嚝馃嚪 Saint-Cyr-l'脡cole | 114 | 1972 |
| 22 | [Socitec](https://www.tamtam.ai/c/socitec) (socitec.com)
A global leader providing shock and vibration isolation solutions to various industries, with offices in France, UK, Germany, China, Tunisia, and the US | Industrial Machinery Manufacturing | 馃嚝馃嚪 Sartrouville | 96 | 1964 |
| 23 | [ATERMES](https://www.tamtam.ai/c/atermes) (atermes.fr)
Provider of defense solutions with expertise in defense industry standards, quality assurance systems, on-board installation, and armament quality assurance compliance since 1989 | Defense and Space Manufacturing | 馃嚝馃嚪 Montigny-le-Bretonneux | 91 | 1989 |
| 24 | [4DConcept](https://www.tamtam.ai/c/4dconcept) (4dconcept.fr)
Specializing in content and editorial engineering, 4D CONCEPT provides tailored solutions for digital content production, publishing, archiving across various industries | Software Development | 馃嚝馃嚪 Montigny-le-Bretonneux | 74 | 1989 |
| 25 | [ASTONFLY](https://www.tamtam.ai/c/astonfly) (astonfly.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 | Higher Education | 馃嚝馃嚪 Toussus-le-Noble | 73 | 2004 |
| 26 | [Groupe Genaris](https://www.tamtam.ai/c/groupe-genaris) (genaris.fr)
Specializes in electrical and electronic design, prototyping, and manufacturing with integrated product development for defense, mobility, and industry sectors. | Engineering Services | 馃嚝馃嚪 Guyancourt | 71 | |
| 27 | [GDI simulation](https://www.tamtam.ai/c/gdi-simulation) (gdi-simulation.fr)
Development of immersive virtual and live outdoor simulators for military training, including weapon firing, tactical scenarios, and precision shooting exercises. | Defense and Space Manufacturing | 馃嚝馃嚪 脡lancourt | 66 | |
| 28 | [Bronzavia Industrie](https://www.tamtam.ai/c/bronzavia-industrie) (bronzavia.com)
Specialized in manufacturing high-technology welded and mechanical assemblies for aerospace, space, and defense industries based in Yvelines. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Sartrouville | 58 | |
| 29 | [Koller](https://www.tamtam.ai/c/koller) (koller.fr)
A 'High Tech' modeling company specializing in complex shape milling, using CNC machines for various materials, with a focus on transportation and nautical industries | Industrial Machinery Manufacturing | 馃嚝馃嚪 Montigny-le-Bretonneux | 58 | 1921 |
| 30 | [ISD-SA](https://www.tamtam.ai/c/isd-sa) (isd-sa.com)
Provides support services for industrial manufacturers in the defense sector, creating support systems, technical publications, maintenance plans, and offering technical assistance globally. | Defense and Space Manufacturing | 馃嚝馃嚪 Versailles | 43 | 1986 |
## 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 14, 2026.
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Source: https://www.tamtam.ai/l/aerospace-and-defense-companies-yvelines