# List of companies with in-house R&D in the Seine-Saint-Denis department

Tamtam tracks 102 companies with in-house R&D headquartered in the Seine-Saint-Denis department. This list ranks the 30 largest by number of employees on LinkedIn, led by Veolia | Water Tech, GRDF and Veolia | France. Their median headcount is 436. Half of them were founded in 1963 or later. The most common headquarters are Saint-Denis (7), Aubervilliers (6) and Villepinte (4).

This selection of companies in Seine-Saint-Denis showcases a diverse industrial landscape, with a notable presence of large and mid-sized firms engaged in environmental services, manufacturing, and higher education. Veolia, for instance, provides global water technology expertise and specialized services for water management. GRDF manages Europe's largest gas distribution network, while Guerbet is a global leader in medical imaging.

Other significant players include Snop - Groupe FSD, which designs and manufactures metal parts for vehicles, and Radiall, a manufacturer of interconnect components for various industries. Université Sorbonne Paris Nord and Université Paris 8 Vincennes-Saint-Denis represent the strong academic presence. A clear pattern is the concentration of headquarters in Aubervilliers, Saint-Denis, and Villepinte, indicating these cities as key economic hubs within the department.

🇫🇷 Seine-Saint-Denis · 30 companies · Updated Nov 14, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Veolia \| Water Tech](https://www.tamtam.ai/c/veolia-water-tech) (veoliawatertechnologies.com)<br>Provides global water technology expertise, ensuring performance, sustainability, and resource protection for communities and industries through advanced solutions and services. | Environmental Services | 🇫🇷 Aubervilliers | 13,064 |  |
| 2 | [GRDF](https://www.tamtam.ai/c/grdf) (grdf.fr)<br>Manages Europe's largest gas distribution network, delivering natural and renewable gases to nearly 11 million customers in France, supporting energy transition. | Oil and Gas | 🇫🇷 Saint-Denis | 7,313 | 2008 |
| 3 | [Veolia \| France](https://www.tamtam.ai/c/veolia-france) (veolia.fr)<br>Provides specialized services for water management, waste treatment, and energy recovery to help cities and industries preserve, access, and renew essential resources. | Environmental Services | 🇫🇷 Aubervilliers | 6,110 | 1853 |
| 4 | [Snop - Groupe FSD](https://www.tamtam.ai/c/snop-groupe-fsd) (snop.eu)<br>Designs, develops, and manufactures metal parts, assemblies, stamping dies, and automatic presses for cars and commercial vehicles. | Motor Vehicle Manufacturing | 🇫🇷 Villepinte | 2,770 |  |
| 5 | [Guerbet](https://www.tamtam.ai/c/guerbet) (guerbet.com)<br>Global leader in medical imaging, offering pharmaceutical products, medical devices, and AI-driven solutions for diagnostic and interventional imaging. Focus on innovation. | Pharmaceutical Manufacturing | 🇫🇷 Villepinte | 2,478 | 1926 |
| 6 | [Université Sorbonne Paris Nord](https://www.tamtam.ai/c/universite-sorbonne-paris-nord) (univ-spn.fr)<br>A multidisciplinary university located in the northern region of Île-de-France, with campuses in Villetaneuse, Saint-Denis, La Plaine Saint-Denis, Bobigny, and Argenteuil | Higher Education | 🇫🇷 Villetaneuse | 2,033 | 1970 |
| 7 | [Radiall](https://www.tamtam.ai/c/radiall) (radiall.com)<br>Manufactures interconnect components for aerospace, defense, industrial, medical, railway, and telecom industries worldwide, with facilities on three continents. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Aubervilliers | 1,898 | 1952 |
| 8 | [Groupe Institut de Soudure](https://www.tamtam.ai/c/groupe-institut-de-soudure) (isgroupe.com)<br>Provides joining technology services, testing, inspection, and training worldwide, supporting design, manufacturing, and maintenance with safety and quality focus. | Mechanical Or Industrial Engineering | 🇫🇷 Villepinte | 1,262 | 1905 |
| 9 | [Université Paris 8 Vincennes-Saint-Denis](https://www.tamtam.ai/c/universite-paris-8-vincennes-saint-denis) (univ-paris8.fr)<br>Higher education institution specializing in cultural sciences, hosting over 21,000 students, numerous research teams, and doctoral schools in Paris. | Higher Education | 🇫🇷 Saint-Denis | 1,177 | 1969 |
| 10 | [CGR International](https://www.tamtam.ai/c/cgr-international) (cgr-international.com)<br>Global company specializing in co-engineering and serial production of mechanical-end mechatronic components through cold transformation and overmolding of metal, with a focus on quality and supply chain efficiency | Spring and Wire Product Manufacturing | 🇫🇷 Sevran | 980 | 1963 |
| 11 | [ARKANCE](https://www.tamtam.ai/c/arkance) (arkance.world)<br>Provides digital transformation solutions and expert services for architecture, engineering, construction, and manufacturing industries, optimizing design, build, and manufacturing processes. | IT Services and IT Consulting | 🇫🇷 Saint-Denis | 679 |  |
| 12 | [ESIEE PARIS](https://www.tamtam.ai/c/esiee-paris) (esiee.fr)<br>Offers engineering education in IT, security, AI, Industry 4.0, electronics, energy, civil engineering, digital health, and arts and sciences. | Higher Education | 🇫🇷 Noisy-le-Grand | 670 | 1904 |
| 13 | [SNCF Voyageurs Matériel](https://www.tamtam.ai/c/sncf-voyageurs-materiel) (sncf-voyageurs.com)<br>Manages maintenance for nearly 17,000 rolling stock units. Provides high-level industrial performance, ensuring safety, quality, and technical expertise for internal and external clients. | Rail Transportation | 🇫🇷 Saint-Denis | 606 |  |
| 14 | [PROVA](https://www.tamtam.ai/c/prova) (prova.fr)<br>Family-owned French company with over 75 years of expertise in extracting vanilla, cocoa, and producing natural brown flavor aromas. | Food and Beverage Manufacturing | 🇫🇷 Montreuil | 592 | 1946 |
| 15 | [Veolia \| Engineering & Consulting](https://www.tamtam.ai/c/veolia-engineering-and-consulting) (engineering-consulting.veolia.com)<br>Consulting engineering and strategic assistance division specializing in designing sustainable solutions for public, industrial, and tertiary sectors, focusing on resource management and performance improvement | Environmental Services | 🇫🇷 Aubervilliers | 436 |  |
| 16 | [RATP Smart Systems](https://www.tamtam.ai/c/ratp-smart-systems) (ratpsmartsystems.com)<br>Expert in passenger information and ticketing services, providing seamless solutions adaptable to different environments Specializes in smart traveler information and e-ticketing solutions | Embedded Software Products | 🇫🇷 Noisy-le-Grand | 367 | 2010 |
| 17 | [Saint-Gobain Innovation Hub Europe](https://www.tamtam.ai/c/saint-gobain-innovation-hub-europe) (sgr-paris.saint-gobain.com)<br>Research center develops high-level skills, technologies for group activities, interacts with academia, anticipates scientific advances, recruits talent. | Research Services | 🇫🇷 Aubervilliers | 360 |  |
| 18 | [Aperam France](https://www.tamtam.ai/c/aperam-france) (aperam.com)<br>Global producer of stainless and electrical steels delivering customized industrial solutions through integrated distribution networks and production sites across Europe and Brazil. | Manufacturing | 🇫🇷 Saint-Denis | 278 |  |
| 19 | [Cantor](https://www.tamtam.ai/c/cantor) (cantor.fr)<br>Cantor is a computer service and engineering company specializing in software and data engineering, including big data processing within strict deadlines | Software Development | 🇫🇷 Neuilly-Plaisance | 250 | 1996 |
| 20 | [EOL Group](https://www.tamtam.ai/c/eol-group) (eol-group.net)<br>Designs and manufactures French office furniture combining functionality, creativity, and durability with responsible production and comprehensive workspace solutions. | Furniture and Home Furnishings Manufacturing | 🇫🇷 Saint-Denis | 232 | 2008 |
| 21 | [Orisha Real Estate](https://www.tamtam.ai/c/orisha-real-estate) (realestate.orisha.com)<br>Editor of SaaS software for real estate professionals. Guides clients in sector challenges, development, and essential solutions for property transactions, management, and assets. | Software Development | 🇫🇷 Saint-Denis | 217 |  |
| 22 | [ISAE-Supméca – Institut supérieur de mécanique de Paris](https://www.tamtam.ai/c/isae-supmeca-institut-superieur-de-mecanique-de-paris) (isae-supmeca.fr)<br>Public higher education institution trains mechanical engineers with strong scientific, technical, and digital engineering skills in design and production, CTI certified. | Higher Education | 🇫🇷 Saint-Ouen-sur-Seine | 205 | 1948 |
| 23 | [EVA - Esports Virtual Arenas](https://www.tamtam.ai/c/eva-esports-virtual-arenas) (eva.gg)<br>Innovative VR esports company offering unique gaming experiences in real arenas up to 1000m2, allowing players to compete against each other | Entertainment Providers | 🇫🇷 Montreuil | 188 | 2018 |
| 24 | [Amada FR](https://www.tamtam.ai/c/amada-fr) (linktr.ee)<br>Specialist in manufacturing machinery for sheet metal working, with extensive patents and global presence in metal fabrication industry. | Industrial Machinery Manufacturing | 🇫🇷 Tremblay-en-France | 180 | 1946 |
| 25 | [MARIE-LAURE PLV MERCHANDISING](https://www.tamtam.ai/c/marie-laure-plv-merchandising) (marie-laure-plv.fr)<br>A leader in customer experience at the point of sale for cosmetics, pharmacy, spirits, and jewelry Specializes in eco-design and recycling | Advertising Services | 🇫🇷 Épinay-sur-Seine | 177 | 1982 |
| 26 | [Vulcanic](https://www.tamtam.ai/c/vulcanic) (vulcanic.com)<br>Design and manufacture electrical heating and cooling solutions including temperature control and power supply for industrial applications worldwide. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Neuilly-sur-Marne | 168 | 1973 |
| 27 | [COMATELEC SCHREDER](https://www.tamtam.ai/c/comatelec-schreder) (fr.schreder.com)<br>Design and supply of intelligent outdoor lighting solutions for smart cities, roads, tunnels, industry, and decorative urban illumination. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Villepinte | 164 | 1951 |
| 28 | [ARIC](https://www.tamtam.ai/c/aric) (aric-sa.fr)<br>Aric is a leading French manufacturer of professional lighting products since 1946, offering a wide range of lamps and fixtures | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Aubervilliers | 157 | 1946 |
| 29 | [AML Systems - Johnson Electric Group](https://www.tamtam.ai/c/aml-systems-johnson-electric-group) (johnsonelectric.com)<br>Design and supply of advanced smart actuators and value-added products for automotive lighting, focusing on quality and innovation. | Motor Vehicle Manufacturing | 🇫🇷 Le Bourget | 132 | 2010 |
| 30 | [MILLS Echafaudage - Etaiement - Coffrage](https://www.tamtam.ai/c/mills-echafaudage-etaiement-coffrage) (mills.fr)<br>Designs, sells, rents, and installs scaffolding and shoring products for construction and heritage building sectors with innovative solutions. | Construction | 🇫🇷 Le Bourget | 125 | 1939 |

## 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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## The same list elsewhere in France

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Source: https://www.tamtam.ai/l/r-and-d-companies-seine-saint-denis