# The 30 largest companies with in-house R&D in the Val-de-Marne department

Tamtam tracks 134 companies with in-house R&D headquartered in the Val-de-Marne department. This list ranks the 30 largest by number of employees on LinkedIn, led by Ubisoft, LCL and DAHER. Their median headcount is 1,070. Half of them were founded in 1962 or later. The most common headquarters are Ivry-sur-Seine (4), Arcueil (3) and Cachan (3).

These companies with in-house R&D in Val-de-Marne represent a mix of sectors, including long-established industrial players and public institutions alongside more recent technology and healthcare firms. Among them are Ubisoft, a global developer of gaming experiences like Assassin's Creed; DAHER, an aircraft manufacturer and industrial service provider; LCL, offering banking services; and Gustave Roussy, a leading cancer center in Europe. The list also features ONF (Office National des Forêts), managing public forests, and Délifrance, a global provider of bakery products.

A notable characteristic of this group is the presence of several public administration bodies and institutions alongside private enterprises. Companies like IGN (French Mapping Agency) and Météo France highlight a strong public sector presence in R&D within the department, complementing the activities of private firms in diverse fields such as pharmaceuticals (BIOCODEX) and specialized dental products (Septodont).

🇫🇷 Val-de-Marne · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Ubisoft](https://www.tamtam.ai/c/ubisoft) (ubisoft.com)<br>Global developer crafting original gaming experiences and entertainment across diverse brands like Assassin’s Creed, Far Cry, and Tom Clancy’s series for worldwide players. | Computer Games | 🇫🇷 Saint-Mandé | 21,273 | 1986 |
| 2 | [LCL](https://www.tamtam.ai/c/lcl) (lcl.fr)<br>Provides banking services for individuals, professionals, businesses, and private banking clients through a national network of branches and employees. | Banking | 🇫🇷 Villejuif | 16,616 |  |
| 3 | [DAHER](https://www.tamtam.ai/c/daher) (daher.com)<br>Aircraft manufacturer, industrialist, industrial service provider, and logistician, designing and developing value-added solutions for aeronautical and industrial clients. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Orly | 8,119 | 1863 |
| 4 | [ONF (Office National des Forêts)](https://www.tamtam.ai/c/onf-office-national-des-forets) (onf.fr)<br>Manages 11 million hectares of public forests. Ensures maintenance, development, and renewal. Balances wood production, environmental preservation, and public access. | Government Administration | 🇫🇷 Maisons-Alfort | 3,354 | 1964 |
| 5 | [Sabena technics](https://www.tamtam.ai/c/sabena-technics) (sabenatechnics.com)<br>French independent provider of maintenance and modification solutions for civil and military aircraft operators, offering airframe, component MRO, upgrades, CAMO, supply chain, painting, and training. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Orly | 3,151 |  |
| 6 | [EFREI - Grande école du numérique](https://www.tamtam.ai/c/efrei-grande-ecole-du-numerique) (efrei.fr)<br>This private engineering school trains students in computer science and digital technology, offering 12 master's specializations, with some courses delivered in English. | Higher Education | 🇫🇷 Villejuif | 2,240 | 1936 |
| 7 | [Gustave Roussy](https://www.tamtam.ai/c/gustave-roussy) (gustaveroussy.fr)<br>A leading cancer center in Europe, specializing in prevention, treatment, research, and education for patients, with two locations in Grand Paris | Hospitals and Health Care | 🇫🇷 Villejuif | 2,076 |  |
| 8 | [Délifrance](https://www.tamtam.ai/c/delifrance) (delifrance.com)<br>A global provider of bakery, viennoiserie, pastry, and savory products, committed to quality, tradition, and innovation to help customers delight consumers worldwide | Food and Beverage Manufacturing | 🇫🇷 Ivry-sur-Seine | 2,017 |  |
| 9 | [Chantelle](https://www.tamtam.ai/c/chantelle) (chantelle.com)<br>An international creative studio designing lingerie since 1876, committed to respect, creativity, honesty, and quality, aiming to create a more inclusive and sustainable society | Textile Manufacturing | 🇫🇷 Cachan | 1,927 |  |
| 10 | [METEO FRANCE](https://www.tamtam.ai/c/meteo-france) (meteofrance.com)<br>A public administration focused on observing and forecasting weather patterns, ensuring the safety of life and property through various centers worldwide | Government Administration | 🇫🇷 Saint-Mandé | 1,748 | 1994 |
| 11 | [BIOCODEX](https://www.tamtam.ai/c/biocodex) (biocodex.com)<br>Develops and markets pharmaceuticals, focusing on microbiota care, women's health, and orphan diseases globally through subsidiaries and distributors. | Pharmaceutical Manufacturing | 🇫🇷 Gentilly | 1,659 | 1953 |
| 12 | [Institut national de l'audiovisuel](https://www.tamtam.ai/c/institut-national-de-l-audiovisuel) (ina.fr)<br>Cultural audiovisual enterprise preserving, enhancing, and transmitting French audiovisual heritage since 1974 Also, an international center for media and digital content research and training | Broadcast Media Production and Distribution | 🇫🇷 Bry-sur-Marne | 1,451 | 1975 |
| 13 | [IGN - French Mapping Agency (Institut Géographique National)](https://www.tamtam.ai/c/ign-french-mapping-agency-institut-geographique-national) (ign.fr)<br>The company operates as the state's geospatial and forestry information provider, developing reference data, products, and services for various public policy support | Government Administration | 🇫🇷 Saint-Mandé | 1,268 | 1940 |
| 14 | [Centre Hospitalier Intercommunal de Créteil](https://www.tamtam.ai/c/centre-hospitalier-intercommunal-de-creteil) (chicreteil.fr)<br>A hospital in Créteil specializing in gynecology, obstetrics, pediatrics, pulmonology, ophthalmology, and ENT services, known as "CHIC" | Hospitals and Health Care | 🇫🇷 Créteil | 1,127 | 1937 |
| 15 | [Septodont](https://www.tamtam.ai/c/septodont) (septodontcorp.com)<br>Leading pharmaceutical and medical device provider specializing in dental anesthesia and developing bioactive and biocompatible therapeutic solutions for dentistry. | Medical Equipment Manufacturing | 🇫🇷 Saint-Maur-des-Fossés | 1,070 | 1932 |
| 16 | [ADVANS Group](https://www.tamtam.ai/c/advans-group) (advans-group.com)<br>Engineering firm specializing in electronic, software, and mechanical systems; handles projects or provides expertise in microelectronics, software development, data/AI, and mechanical engineering. | Engineering Services | 🇫🇷 Cachan | 1,040 | 2000 |
| 17 | [Cenexi](https://www.tamtam.ai/c/cenexi) (cenexi.com)<br>A French CDMO with 4 manufacturing sites and 1 development center, specializing in medicinal products, particularly in sterile expertise and cytotoxic products | Pharmaceutical Manufacturing | 🇫🇷 Fontenay-sous-Bois | 995 | 2004 |
| 18 | [INNOTHERA](https://www.tamtam.ai/c/innothera) (innothera.com)<br>Develops and manufactures healthcare products, including elastic compression, orthopedics, podiatry, hygiene, and daily medications, for widespread distribution to patients. | Pharmaceutical Manufacturing | 🇫🇷 Arcueil | 981 | 1913 |
| 19 | [U-Shin](https://www.tamtam.ai/c/u-shin)<br>Company recently renamed to Minebea AccessSolutions, opening a new chapter with broader perspective and enhanced capacities. This company manufactures door and access systems. | Motor Vehicle Manufacturing | 🇫🇷 Alfortville | 968 | 1962 |
| 20 | [IT Link Group](https://www.tamtam.ai/c/it-link-group) (itlink.fr)<br>Innovates and optimizes connected systems, developing products and services in embedded intelligence, IoT, data, mobile apps, safety, business systems, engineering, and change management. | IT Services and IT Consulting | 🇫🇷 Le Kremlin-Bicêtre | 882 | 1986 |
| 21 | [EPITA: Ecole d'Ingénieurs en Informatique](https://www.tamtam.ai/c/epita-ecole-d-ingenieurs-en-informatique) (epita.fr)<br>Training bold individuals in IT and digital innovation to drive societal success, transforming daily lives, and addressing major technological, industrial, economic, and social challenges. | Higher Education | 🇫🇷 Le Kremlin-Bicêtre | 846 | 1984 |
| 22 | [Aramisauto](https://www.tamtam.ai/c/aramisauto) (emploi-aramisauto.com)<br>Revolutionizing car buying in Europe by offering new and used sales of all makes under one brand, providing exceptional buying experiences | Retail | 🇫🇷 Arcueil | 793 | 2001 |
| 23 | [Essilor Group](https://www.tamtam.ai/c/essilor-group) (essilor.com)<br>A leading ophthalmic optics company that designs, manufactures, and markets a wide range of lenses to improve and protect eyesight worldwide | Business Consulting and Services | 🇫🇷 Charenton-le-Pont | 727 |  |
| 24 | [SIAé - Service industriel de l'aéronautique](https://www.tamtam.ai/c/siae-service-industriel-de-l-aeronautique) (defense.gouv.fr)<br>Provides maintenance and design for French military aircraft and helicopters, offering jobs in aeronautical maintenance, engineering, and support functions like logistics and HR. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Arcueil | 498 | 1934 |
| 25 | [Sodern](https://www.tamtam.ai/c/sodern) (sodern.com)<br>A global leader in space optronics, neutron technology, and defense, providing innovative solutions for climate, internet connectivity, agriculture, and resource efficiency 🌍🛰️👩🔬🇫🇷 | Defense and Space Manufacturing | 🇫🇷 Limeil-Brévannes | 426 | 1962 |
| 26 | [Cemex France](https://www.tamtam.ai/c/cemex-france) (cemex.fr)<br>A global leader in cement, aggregates, and ready-mix concrete solutions, offering innovative and sustainable products to improve construction and urban living worldwide | Wholesale Building Materials | 🇫🇷 Rungis | 420 | 1906 |
| 27 | [ESTP](https://www.tamtam.ai/c/estp) (estp.fr)<br>A leading engineering school in France specializing in construction and urban planning, with a strong alumni network and partnerships worldwide | Higher Education | 🇫🇷 Cachan | 418 | 1891 |
| 28 | [Forsee Power](https://www.tamtam.ai/c/forsee-power) (forseepower.com)<br>Industrial group specializing in smart battery systems for various electric transport, including design, assembly, supply, installation, commissioning, maintenance, financing, and second-life solutions. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Ivry-sur-Seine | 410 | 2011 |
| 29 | [ESIEA - École d'Ingénieur·e·s d'un numérique utile](https://www.tamtam.ai/c/esiea-ecole-d-ingenieur-e-s-d-un-numerique-utile) (esiea.fr)<br>The company is a highly reputable engineering school specializing in digital sciences and technologies, offering programs in information systems and embedded systems | Higher Education | 🇫🇷 Ivry-sur-Seine | 301 | 1958 |
| 30 | [STUDEC](https://www.tamtam.ai/c/studec) (studec.fr)<br>Specializing in after-sales customer support solutions, we serve industrial sectors such as aeronautics, defense, space, naval, and energy with innovative technical documentation and software development | IT Services and IT Consulting | 🇫🇷 Ivry-sur-Seine | 272 | 1956 |

## 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.

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## The same list elsewhere in France

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Source: https://www.tamtam.ai/l/r-and-d-companies-val-de-marne