# Top 30 companies with in-house R&D in the Hauts-de-Seine department
Tamtam tracks 510 companies with in-house R&D headquartered in the Hauts-de-Seine department. This list ranks the 30 largest by number of employees on LinkedIn, led by Schneider Electric, Thales and ALTEN. Their median headcount is 9,551. Half of them were founded in 1958 or later. The most common headquarters are Courbevoie (5), Nanterre (4) and Boulogne-Billancourt (3).
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.
馃嚝馃嚪 Hauts-de-Seine 路 30 companies 路 Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Schneider Electric](https://www.tamtam.ai/c/schneider-electric) (se.com)
Global energy technology leader, providing efficiency and sustainability through electrifying, automating, and digitalizing industries, businesses, and homes with intelligent devices and digital services. | Automation Machinery Manufacturing | 馃嚝馃嚪 Rueil-Malmaison | 87,938 | 1836 |
| 2 | [Thales](https://www.tamtam.ai/c/thales) (thalesgroup.com)
Multinational specializing in cybersecurity, defense, aerospace, digital identity, and secure communications for governments and industries. | Defense and Space Manufacturing | 馃嚝馃嚪 Meudon | 65,031 | |
| 3 | [ALTEN](https://www.tamtam.ai/c/alten) (alten.com)
Provides engineering and IT services, supporting businesses in technological and sustainable transformation across various industries with high-level consultant-engineers. | Engineering Services | 馃嚝馃嚪 Boulogne-Billancourt | 38,710 | 1988 |
| 4 | [Saint-Gobain](https://www.tamtam.ai/c/saint-gobain) (saint-gobain.com)
Designs, manufactures, distributes materials, services for residential, non-residential, infrastructure markets; provides sustainable, performing, well-being solutions. | Wholesale Building Materials | 馃嚝馃嚪 Courbevoie | 36,697 | |
| 5 | [Faurecia](https://www.tamtam.ai/c/faurecia) (faurecia.com)
Designing automotive tech solutions for safe, personalized, connected, and sustainable mobility. A company of the Group FORVIA, contributing to tomorrow's mobility. | Motor Vehicle Manufacturing | 馃嚝馃嚪 Nanterre | 29,764 | 1997 |
| 6 | [VINCI Construction](https://www.tamtam.ai/c/vinci-construction) (vinci-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. | Construction | 馃嚝馃嚪 Nanterre | 17,372 | |
| 7 | [ELIS](https://www.tamtam.ai/c/elis-puteaux) (elis.com)
A global provider of circular services for hygiene and well-being, offering solutions for various sectors while promoting environmental sustainability and customer focus | Facilities Services | 馃嚝馃嚪 Puteaux | 15,750 | 1883 |
| 8 | [Arkema](https://www.tamtam.ai/c/arkema) (arkema.com)
Designs innovative, sustainable materials; addresses new energy, technology, resource, mobility, and urbanization challenges with materials science expertise. | Chemical Manufacturing | 馃嚝馃嚪 Puteaux | 14,720 | 2006 |
| 9 | [Servier](https://www.tamtam.ai/c/servier) (servier.com)
Develops pharmaceuticals focused on cardiology, venous diseases, oncology, neurology, and rare diseases, prioritizing patient needs and investing heavily in research. | Pharmaceutical Manufacturing | 馃嚝馃嚪 Suresnes | 14,291 | 1954 |
| 10 | [Framatome](https://www.tamtam.ai/c/framatome) (framatome.com)
Designs, services and installs components, fuel, and instrumentation and control systems for global nuclear power plants while providing digital and technical expertise. | Utilities | 馃嚝馃嚪 Courbevoie | 14,188 | 1958 |
| 11 | [Yves Rocher](https://www.tamtam.ai/c/yves-rocher) (groupe-rocher.com)
Creates natural, effective, and committed cosmetics from plant active ingredients, cultivated and transformed into high-performance formulas, distributed globally with environmental commitment. | Retail | 馃嚝馃嚪 Issy-les-Moulineaux | 12,823 | 1959 |
| 12 | [Orano](https://www.tamtam.ai/c/orano) (orano.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. | Nuclear Electric Power Generation | 馃嚝馃嚪 Ch芒tillon | 12,605 | 2018 |
| 13 | [Altran](https://www.tamtam.ai/c/altran) (capgemini-engineering.com)
Altran, now Capgemini Engineering, offers engineering services Follow them on LinkedIn for updates and insights | IT Services and IT Consulting | 馃嚝馃嚪 Neuilly-sur-Seine | 11,652 | |
| 14 | [Apave](https://www.tamtam.ai/c/apave) (apave.com)
Specializes in technical, human, environmental, and digital risk management, ensuring safety and performance across various economic sectors for over 150 years. | Environmental Services | 馃嚝馃嚪 Courbevoie | 9,778 | 1867 |
| 15 | [Plastic Omnium](https://www.tamtam.ai/c/plastic-omnium) (plasticomnium.com)
Provides innovative automotive solutions: exterior systems, lighting, clean energy, and complex modules. Focuses on zero-carbon mobility through hydrogen and electrification. | Motor Vehicle Manufacturing | 馃嚝馃嚪 Levallois-Perret | 9,551 | |
| 16 | [BNP Paribas Cardif](https://www.tamtam.ai/c/bnp-paribas-cardif) (bnpparibascardif.com)
Global leader in bancassurance and personal insurance, offering products and services through partnerships to over 80 million customers worldwide. | Insurance | 馃嚝馃嚪 Nanterre | 9,381 | |
| 17 | [Vallourec](https://www.tamtam.ai/c/vallourec) (vallourec.com)
Provides benchmark tubular solutions for energy, oil and gas, industrial applications, hydrogen, CCUS, geothermal, and solar energy markets. | Oil and Gas | 馃嚝馃嚪 Meudon | 8,787 | 1899 |
| 18 | [Nexans](https://www.tamtam.ai/c/nexans) (nexans.com)
Design, manufacture, and services for cable systems across transmission, grid, connectivity, and industry sectors, focusing on sustainable, decarbonized electricity. | Manufacturing | 馃嚝馃嚪 Courbevoie | 8,776 | |
| 19 | [Parfums Christian Dior](https://www.tamtam.ai/c/parfums-christian-dior) (dior.com)
Creates luxury fragrances and cosmetics, upholding a heritage of innovation and global beauty through meticulous production and cultivation of talent. | Personal Care Product Manufacturing | 馃嚝馃嚪 Neuilly-sur-Seine | 8,660 | 1946 |
| 20 | [Keolis Group](https://www.tamtam.ai/c/keolis-group) (keolis.com)
Global leader in shared mobility, co-constructing safe, smart, and sustainable public transport solutions including metros, tramways, buses, and various innovative services. | Ground Passenger Transportation | 馃嚝馃嚪 Courbevoie | 7,847 | 2001 |
| 21 | [Bel](https://www.tamtam.ai/c/bel) (groupe-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. | Food and Beverage Manufacturing | 馃嚝馃嚪 Suresnes | 7,770 | |
| 22 | [Dassault Aviation](https://www.tamtam.ai/c/dassault-aviation) (dassault-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. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Saint-Cloud | 7,267 | |
| 23 | [Coface](https://www.tamtam.ai/c/coface) (coface.com)
Manages credit risk for companies, supporting their growth by offering trade credit insurance, business information, debt collection, and factoring solutions. | Insurance | 馃嚝馃嚪 Bois-Colombes | 6,948 | 1946 |
| 24 | [SAUR](https://www.tamtam.ai/c/saur) (saur.com)
A global company providing water and essential services, committed to protecting the environment and ensuring quality service for municipalities and cities worldwide | Environmental Services | 馃嚝馃嚪 Issy-les-Moulineaux | 6,850 | 1933 |
| 25 | [JCDecaux](https://www.tamtam.ai/c/jcdecaux) (jcdecaux.com)
Global leader in outdoor advertising, specializing in street furniture, transport advertising, and billboard displays worldwide. | Advertising Services | 馃嚝馃嚪 Neuilly-sur-Seine | 6,312 | 1964 |
| 26 | [TRIGO](https://www.tamtam.ai/c/trigo) (trigo-group.com)
Provides comprehensive quality solutions and management services for automotive, aerospace, and transport industries, addressing supply chain challenges globally with local expertise. | Business Consulting and Services | 馃嚝馃嚪 Nanterre | 5,771 | 1997 |
| 27 | [SAGEMCOM](https://www.tamtam.ai/c/sagemcom) (sagemcom.com)
Provides innovative broadband internet, entertainment, and managed energy solutions. Designs sustainable technology, leader in its markets, with employee ownership. | Telecommunications | 馃嚝馃嚪 Bois-Colombes | 5,279 | 2008 |
| 28 | [GE Renewable Energy](https://www.tamtam.ai/c/ge-renewable-energy) (ge.com)
Engineers energy products and digital services using wind, solar, and hydro resources for global customers, delivering affordable, reliable, and sustainable power. | Renewable Energy Equipment Manufacturing | 馃嚝馃嚪 Boulogne-Billancourt | 4,994 | |
| 29 | [GE Grid Solutions](https://www.tamtam.ai/c/ge-grid-solutions) (gevernova.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. | Electric Power Transmission, Control, and Distribution | 馃嚝馃嚪 Boulogne-Billancourt | 4,934 | 1892 |
| 30 | [CERBA HEALTHCARE](https://www.tamtam.ai/c/cerba-healthcare) (cerbahealthcare.com)
A leading player in medical diagnosis focusing on prevention, disease detection, early diagnosis, and personalized medicine to advance health worldwide | Hospitals and Health Care | 馃嚝馃嚪 Issy-les-Moulineaux | 4,406 | |
## 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](https://www.tamtam.ai/l/largest-companies-hauts-de-seine) (5,160)
- [Multinational companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/multinational-companies-hauts-de-seine) (1,231)
- [IT services companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/it-services-companies-hauts-de-seine) (737)
- [IT Services and IT Consulting companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-hauts-de-seine) (706)
- [Professional services firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/professional-services-firms-hauts-de-seine) (629)
- [Consulting firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/consulting-firms-hauts-de-seine) (563)
- [SaaS companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/saas-companies-hauts-de-seine) (389)
- [Business Consulting and Services companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/business-consulting-and-services-companies-hauts-de-seine) (304)
- [Software Development companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/software-development-companies-hauts-de-seine) (301)
- [Retail chains in the Hauts-de-Seine department](https://www.tamtam.ai/l/retail-chains-hauts-de-seine) (292)
- [Manufacturers in the Hauts-de-Seine department](https://www.tamtam.ai/l/manufacturers-hauts-de-seine) (285)
- [Advertising Services companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/advertising-services-companies-hauts-de-seine) (281)
- [Marketing and communications agencies in the Hauts-de-Seine department](https://www.tamtam.ai/l/marketing-agencies-hauts-de-seine) (235)
- [Subscription businesses in the Hauts-de-Seine department](https://www.tamtam.ai/l/subscription-businesses-hauts-de-seine) (228)
- [Hardware manufacturers in the Hauts-de-Seine department](https://www.tamtam.ai/l/hardware-companies-hauts-de-seine) (199)
- [Financial services firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/financial-services-firms-hauts-de-seine) (198)
- [Companies with a mobile app in the Hauts-de-Seine department](https://www.tamtam.ai/l/companies-with-mobile-app-hauts-de-seine) (189)
- [Critical infrastructure operators in the Hauts-de-Seine department](https://www.tamtam.ai/l/critical-infrastructure-operators-hauts-de-seine) (169)
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- [Education providers in the Hauts-de-Seine department](https://www.tamtam.ai/l/education-companies-hauts-de-seine) (159)
- [Cybersecurity companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/cybersecurity-companies-hauts-de-seine) (154)
- [Distributors and wholesalers in the Hauts-de-Seine department](https://www.tamtam.ai/l/distributors-and-wholesalers-hauts-de-seine) (154)
- [Recruitment and staffing agencies in the Hauts-de-Seine department](https://www.tamtam.ai/l/recruitment-agencies-hauts-de-seine) (152)
- [Energy companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/energy-companies-hauts-de-seine) (144)
## The same list elsewhere in France
- [Companies with in-house R&D in France](https://www.tamtam.ai/l/r-and-d-companies-france) (8,749)
- [Companies with in-house R&D in 脦le-de-France](https://www.tamtam.ai/l/r-and-d-companies-ile-de-france) (2,695)
- [Companies with in-house R&D in Auvergne-Rh么ne-Alpes](https://www.tamtam.ai/l/r-and-d-companies-auvergne-rhone-alpes) (1,460)
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- [Companies with in-house R&D in Grand Est](https://www.tamtam.ai/l/r-and-d-companies-grand-est) (640)
- [Companies with in-house R&D in Provence-Alpes-C么te d'Azur](https://www.tamtam.ai/l/r-and-d-companies-provence-alpes-cote-dazur) (612)
- [Companies with in-house R&D in Nouvelle-Aquitaine](https://www.tamtam.ai/l/r-and-d-companies-nouvelle-aquitaine) (566)
- [Companies with in-house R&D in the Rh么ne department](https://www.tamtam.ai/l/r-and-d-companies-rhone) (509)
- [Companies with in-house R&D in Pays de la Loire](https://www.tamtam.ai/l/r-and-d-companies-pays-de-la-loire) (480)
- [Companies with in-house R&D in Hauts-de-France](https://www.tamtam.ai/l/r-and-d-companies-hauts-de-france) (410)
- [Companies with in-house R&D in Brittany](https://www.tamtam.ai/l/r-and-d-companies-brittany) (366)
- [Companies with in-house R&D in the Haute-Garonne department](https://www.tamtam.ai/l/r-and-d-companies-haute-garonne) (323)
- [Companies with in-house R&D in the Bouches-du-Rh么ne department](https://www.tamtam.ai/l/r-and-d-companies-bouches-du-rhone) (320)
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- [Companies with in-house R&D in Bourgogne-Franche-Comt茅](https://www.tamtam.ai/l/r-and-d-companies-bourgogne-franche-comte) (261)
- [Companies with in-house R&D in the Nord department](https://www.tamtam.ai/l/r-and-d-companies-nord) (237)
- [Companies with in-house R&D in Normandy](https://www.tamtam.ai/l/r-and-d-companies-normandy) (227)
- [Companies with in-house R&D in the Gironde department](https://www.tamtam.ai/l/r-and-d-companies-gironde) (225)
- [Companies with in-house R&D in the Loire-Atlantique department](https://www.tamtam.ai/l/r-and-d-companies-loire-atlantique) (207)
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- [Companies with in-house R&D in Paris](https://www.tamtam.ai/l/r-and-d-companies-paris) (1,249)
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## The same list elsewhere
- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Companies with in-house R&D in Europe](https://www.tamtam.ai/l/r-and-d-companies-in-europe) (20,169)
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Source: https://www.tamtam.ai/l/r-and-d-companies-hauts-de-seine