The Hauts-de-Seine department hosts a concentration of large industrial and technology groups with significant in-house R&D capabilities. These companies operate in diverse sectors, including energy management, defense, automotive, and construction. Notable examples include Schneider Electric, a global leader in energy technology, Thales, specializing in cybersecurity and aerospace, and Saint-Gobain, a major player in building materials.
The companies listed here reflect a strong presence of established enterprises, many with long histories, such as Schneider Electric (founded 1836) and Saint-Gobain. There is also a notable cluster of automotive-related R&D, with Faurecia and Plastic Omnium both headquartered in the department, focusing on future mobility solutions.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Schneider Electricse.com
Global energy technology leader, providing efficiency and sustainability through electrifying, automating, and digitalizing industries, businesses, and homes with intelligent devices and digital services. |
87,938 | |||
| 2 |
Thalesthalesgroup.com
Multinational specializing in cybersecurity, defense, aerospace, digital identity, and secure communications for governments and industries. |
65,031 | |||
| 3 | 38,710 | ||||
| 4 |
Saint-Gobainsaint-gobain.com
Designs, manufactures, distributes materials, services for residential, non-residential, infrastructure markets; provides sustainable, performing, well-being solutions. |
36,697 | |||
| 5 |
Faureciafaurecia.com
Designing automotive tech solutions for safe, personalized, connected, and sustainable mobility. A company of the Group FORVIA, contributing to tomorrow's mobility. |
29,764 | |||
| 6 |
VINCI Constructionvinci-construction.com
French global construction group, with over 830 companies and 69,000 employees in 100 countries. Specializes in building, civil engineering, and related activities. |
17,372 | |||
| 7 | 15,750 | ||||
| 8 |
Arkemaarkema.com
Designs innovative, sustainable materials; addresses new energy, technology, resource, mobility, and urbanization challenges with materials science expertise. |
14,720 | |||
| 9 |
Servierservier.com
Develops pharmaceuticals focused on cardiology, venous diseases, oncology, neurology, and rare diseases, prioritizing patient needs and investing heavily in research. |
14,291 | |||
| 10 |
Framatomeframatome.com
Designs, services and installs components, fuel, and instrumentation and control systems for global nuclear power plants while providing digital and technical expertise. |
14,188 | |||
| 11 |
Yves Rochergroupe-rocher.com
Creates natural, effective, and committed cosmetics from plant active ingredients, cultivated and transformed into high-performance formulas, distributed globally with environmental commitment. |
12,823 | |||
| 12 |
Oranoorano.group
International operator in nuclear materials, provides high-value products and services across the entire fuel cycle, addressing energy and health challenges through expertise and innovation. |
12,605 | |||
| 13 |
Altrancapgemini-engineering.com
Altran, now Capgemini Engineering, offers engineering services Follow them on LinkedIn for updates and insights |
11,652 | |||
| 14 | 9,778 | ||||
| 15 |
Plastic Omniumplasticomnium.com
Provides innovative automotive solutions: exterior systems, lighting, clean energy, and complex modules. Focuses on zero-carbon mobility through hydrogen and electrification. |
9,551 | |||
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 |
BNP Paribas Cardifbnpparibascardif.com
Global leader in bancassurance and personal insurance, offering products and services through partnerships to over 80 million customers worldwide. |
9,381 | |||
| 17 |
Vallourecvallourec.com
Provides benchmark tubular solutions for energy, oil and gas, industrial applications, hydrogen, CCUS, geothermal, and solar energy markets. |
8,787 | |||
| 18 |
Nexansnexans.com
Design, manufacture, and services for cable systems across transmission, grid, connectivity, and industry sectors, focusing on sustainable, decarbonized electricity. |
8,776 | |||
| 19 |
Parfums Christian Diordior.com
Creates luxury fragrances and cosmetics, upholding a heritage of innovation and global beauty through meticulous production and cultivation of talent. |
8,660 | |||
| 20 |
Keolis Groupkeolis.com
Global leader in shared mobility, co-constructing safe, smart, and sustainable public transport solutions including metros, tramways, buses, and various innovative services. |
7,847 | |||
| 21 |
Belgroupe-bel.com
Leading food producer of dairy, fruit, and plant-based products, globally recognized for branded cheeses and healthy food options distributed in over 120 countries. |
7,770 | |||
| 22 |
Dassault Aviationdassault-aviation.com
French aerospace company designs, builds military aircraft, business jets, and space systems. Leader in new generation fighters, Rafale, Falcon jets, and pioneering digital technologies. |
7,267 | |||
| 23 |
Cofacecoface.com
Manages credit risk for companies, supporting their growth by offering trade credit insurance, business information, debt collection, and factoring solutions. |
6,948 | |||
| 24 | 6,850 | ||||
| 25 |
JCDecauxjcdecaux.com
Global leader in outdoor advertising, specializing in street furniture, transport advertising, and billboard displays worldwide. |
6,312 | |||
| 26 |
TRIGOtrigo-group.com
Provides comprehensive quality solutions and management services for automotive, aerospace, and transport industries, addressing supply chain challenges globally with local expertise. |
5,771 | |||
| 27 |
SAGEMCOMsagemcom.com
Provides innovative broadband internet, entertainment, and managed energy solutions. Designs sustainable technology, leader in its markets, with employee ownership. |
5,279 | |||
| 28 |
GE Renewable Energyge.com
Engineers energy products and digital services using wind, solar, and hydro resources for global customers, delivering affordable, reliable, and sustainable power. |
4,994 | |||
| 29 |
GE Grid Solutionsgevernova.com
Provides utilities and industries with equipment, systems, services for reliable power delivery from generation to consumers, focusing on renewable integration and energy transition acceleration. |
4,934 | |||
| 30 |
CERBA HEALTHCAREcerbahealthcare.com
A leading player in medical diagnosis focusing on prevention, disease detection, early diagnosis, and personalized medicine to advance health worldwide |
4,406 | |||
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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 12, 2026.
More company lists in the Hauts-de-Seine department
- The largest companies in the Hauts-de-Seine department 5,160
- Multinational companies in the Hauts-de-Seine department 1,231
- IT services companies in the Hauts-de-Seine department 737
- IT Services and IT Consulting companies in the Hauts-de-Seine department 706
- Professional services firms in the Hauts-de-Seine department 629
- Consulting firms in the Hauts-de-Seine department 563
- SaaS companies in the Hauts-de-Seine department 389
- Business Consulting and Services companies in the Hauts-de-Seine department 304
- Software Development companies in the Hauts-de-Seine department 301
- Retail chains in the Hauts-de-Seine department 292
- Manufacturers in the Hauts-de-Seine department 285
- Advertising Services companies in the Hauts-de-Seine department 281
- Marketing and communications agencies in the Hauts-de-Seine department 235
- Subscription businesses in the Hauts-de-Seine department 228
- Hardware manufacturers in the Hauts-de-Seine department 199
- Financial services firms in the Hauts-de-Seine department 198
- Companies with a mobile app in the Hauts-de-Seine department 189
- Critical infrastructure operators in the Hauts-de-Seine department 169
- AI companies in the Hauts-de-Seine department 159
- Education providers in the Hauts-de-Seine department 159
- Cybersecurity companies in the Hauts-de-Seine department 154
- Distributors and wholesalers in the Hauts-de-Seine department 154
- Recruitment and staffing agencies in the Hauts-de-Seine department 152
- Energy companies in the Hauts-de-Seine department 144
The same list elsewhere in France
- Companies with in-house R&D in France 8,749
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- Companies with in-house R&D in Auvergne-Rh么ne-Alpes 1,460
- Companies with in-house R&D in Occitanie 680
- Companies with in-house R&D in Grand Est 640
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- 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-Rh么ne department 320
- Companies with in-house R&D in the Is猫re department 304
- Companies with in-house R&D in Bourgogne-Franche-Comt茅 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
- Companies with in-house R&D in Toulouse 172