The Yvelines department is home to a significant concentration of large and mid-sized companies engaged in in-house research and development. These firms are primarily in manufacturing sectors such as motor vehicles, aviation and aerospace, and defense, alongside strong representation in civil engineering and software development. Key players include Dassault Systèmes, which pioneers virtual worlds; Groupe PSA (now Stellantis), a major automaker; ArianeGroup, focused on space launch systems; and SOCOTEC, providing services for built assets. A notable pattern is the clustering of headquarters in Vélizy-Villacoublay, indicating a hub for corporate R&D activities within the department.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Dassault Systèmes3ds.com
Pioneering virtual worlds since 1981, this company offers a platform enabling customers across industries to collaborate, imagine, and create sustainable innovations for real-life impact. |
27,414 | |||
| 2 |
Groupe PSAgroupe-psa.com
Leading automaker and mobility provider; now known as Stellantis. This entity is one of the world's foremost in vehicle manufacturing and mobility solutions. |
16,153 | |||
| 3 |
Peugeotpeugeot.com
Offers customers exhilarating, quality driving experiences through racy design and uncompromised quality, adding excitement to every journey. |
9,490 | |||
| 4 |
SOCOTECsocotec.fr
Provides services throughout the entire life cycle of built assets for compliance, extended lifespan, improved performance, and people’s safety in construction, infrastructure, and industry. |
7,326 | |||
| 5 |
ArianeGroupariane.group
Designing, developing, manufacturing, and operating space launch systems and strategic missiles for space and defense sectors. |
6,651 | |||
| 6 |
Eiffage Génie Civileiffagegeniecivil.com
Specializing in civil engineering, this company designs, builds, maintains, and demolishes ambitious structures in France and internationally with a human perspective |
3,786 | |||
| 7 |
Eiffage Routeeiffageroute.com
An expert in urban development, Eiffage Route contributes to improving the French road network through design, construction, maintenance, and various other projects |
3,480 | |||
| 8 |
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 | |||
| 9 |
Novares Groupnovaresteam.com
Designs, manufactures complex plastic components and systems for the automotive industry, focusing on greener, lighter, and connected cars with intuitive interfaces. |
2,833 | |||
| 10 |
UVSQ Université de Versailles Saint-Quentin-en-Yvelinesuvsq.fr
Provides diverse higher education, conducts innovative research across various fields, and fosters technological advancements with strong industry and international partnerships. |
2,170 | |||
| 11 | 
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 | |||
| 12 | 1,469 | ||||
| 13 |
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 | |||
| 14 |
Jungheinrich France SASjungheinrich.fr
International leader in handling equipment, storage systems, and goods flow management. Offers forklifts, racking, services, and consulting for warehouse logistics needs. |
909 | |||
| 15 |
CULLIGAN FRANCEculligan.fr
Specialist in water treatment providing softeners, purifiers, and water fountains for homes, businesses, and communities ensuring quality water. |
862 | |||
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 |
Emotorsemotors.com
Design and manufacturing of electric machines for on-road vehicles, providing solutions for propulsion and power generation in the automotive industry. |
811 | |||
| 17 |
Carmatcarmatsa.com
Designs, manufactures, and markets the Aeson artificial heart, a physiological and self-regulated device for end-stage biventricular heart failure patients awaiting transplant. |
760 | |||
| 18 |
ENVEA Globalenvea.global
Provides advanced certified air quality and emissions monitoring solutions to help industries meet environmental targets and move towards net zero. Prevent harmful environmental pollution. |
738 | |||
| 19 |
Schindler Franceschindler.fr
Design, manufacture, install, maintain, and modernize elevators, escalators, moving walkways, and building mobility management products worldwide. |
719 | |||
| 20 |
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 | |||
| 21 | 550 | ||||
| 22 |
Emitech Groupemitech.fr
Provides global testing services for automotive, aeronautic, and defense industries, including environmental, mechanical, EMC, and electrical tests on components, systems, and vehicles. |
510 | |||
| 23 | 405 | ||||
| 24 |
Ineo Defense
Provides technological solutions and services for defense and security, covering critical communications, electronic warfare, operational system protection, and site surveillance. |
355 | |||
| 25 |
Egis en Franceegis-group.com
International consulting, construction engineering, and mobility services company. Designs and operates smart infrastructure and buildings addressing climate challenges for balanced and sustainable territorial development. |
349 | |||
| 26 |
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 | |||
| 27 |
ETANCO Groupetancogroup.com
Providing a wide range of fixing and fastening solutions for building envelopes, including waterproofing, roofing, cladding, and facades. |
289 | |||
| 28 |
IGIENAIRigienair.com
Specializing in Indoor Air Quality, IGIENAIR offers services for air purification and control, along with monitoring tools for commercial spaces worldwide |
272 | |||
| 29 |
Groupe Airwellairwell.com
French brand specializing in air conditioning and heating solutions, present in over 80 countries since 1947, a reference in the industry. |
263 | |||
| 30 |
Nissan West Europe – Francenissan.fr
Design and manufacture innovative vehicles including crossovers and electric cars, focusing on accessible technology and customer-centric solutions. |
252 | |||
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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 12, 2026.
More company lists in the Yvelines department
- The largest companies in the Yvelines department 1,469
- Multinational companies in the Yvelines department 226
- 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
- Aerospace and defence companies in the Yvelines department 65
- 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
- Companies with in-house R&D in France 8,749
- Companies with in-house R&D in Île-de-France 2,695
- Companies with in-house R&D in Auvergne-Rhône-Alpes 1,460
- Companies with in-house R&D in Occitanie 680
- Companies with in-house R&D in Grand Est 640
- Companies with in-house R&D in Provence-Alpes-Côte d'Azur 612
- Companies with in-house R&D in Nouvelle-Aquitaine 566
- Companies with in-house R&D in the Hauts-de-Seine department 510
- Companies with in-house R&D in the Rhône department 509
- Companies with in-house R&D in Pays de la Loire 480
- Companies with in-house R&D in Hauts-de-France 410
- Companies with in-house R&D in Brittany 366
- Companies with in-house R&D in the Haute-Garonne department 323
- Companies with in-house R&D in the Bouches-du-Rhône department 320
- Companies with in-house R&D in the Isère department 304
- Companies with in-house R&D in Bourgogne-Franche-Comté 261
- Companies with in-house R&D in the Nord department 237
- Companies with in-house R&D in Normandy 227
- Companies with in-house R&D in the Gironde department 225
- Companies with in-house R&D in the Loire-Atlantique department 207
- Companies with in-house R&D in the Essonne department 198
- Companies with in-house R&D in Centre-Val de Loire 195
- Companies with in-house R&D in Paris 1,249
- Companies with in-house R&D in Lyon 192