# 30 leading companies with in-house R&D in the Val-d'Oise department Tamtam tracks 88 companies with in-house R&D headquartered in the Val-d'Oise department. This list ranks the 30 largest by number of employees on LinkedIn, led by Eviden, JJA SA and VYGON. Their median headcount is 250. Half of them were founded in 1976 or later. The most common headquarters are Roissy-en-France (6), Bezons (5) and Argenteuil (2). These companies with in-house R&D in Val-d'Oise are primarily mid-sized to large firms, with a strong presence in IT services, industrial machinery, and medical equipment manufacturing. Eviden, with over 10,000 employees, specializes in digital transformation. VYGON designs and manufactures single-use medical products, while Worldgrid focuses on smart energy solutions. SERIMAX is a global leader in pipeline welding solutions. A notable pattern is the concentration of headquarters in specific towns like Bezons, Gonesse, and Roissy-en-France, indicating regional clusters of R&D activity. The founding dates span from the mid-19th century with JRI, which develops temperature monitoring solutions, to more recent establishments like CY Tech, founded in 2020. 🇫🇷 Val-d'Oise · 30 companies · Updated Nov 12, 2026 | # | Company | Industry | Headquarters | Employees | Founded | |---|---|---|---|---|---| | 1 | [Eviden](https://www.tamtam.ai/c/eviden) (eviden.com)
Eviden is a global leader in digital transformation, offering expertise in digital, cloud, data, advanced computing, and security solutions to industries worldwide | IT Services and IT Consulting | 🇫🇷 Bezons | 10,793 | | | 2 | [JJA SA](https://www.tamtam.ai/c/jja-sa) (groupe-jja.com)
Family-owned brand manufacturer in home goods, offering a large product range across decoration, utilities, outdoor, and tableware with strong brands. | Manufacturing | 🇫🇷 Gonesse | 1,362 | 1976 | | 3 | [VYGON](https://www.tamtam.ai/c/vygon) (vygon.com)
Designs, manufactures, and distributes single-use medical and surgical products, ensuring high quality and reliability through continuous research, technological implementation, and strict quality control. | Medical Equipment Manufacturing | 🇫🇷 Ecouen | 1,213 | | | 4 | [Worldgrid](https://www.tamtam.ai/c/worldgrid) (alten.com)
Specializing in smart energy solutions for utilities, we offer integration projects and real-time solutions across the power, water, oil & gas sectors | IT Services and IT Consulting | 🇫🇷 Bezons | 970 | 2009 | | 5 | [UUDS AERO](https://www.tamtam.ai/c/uuds-aero) (uuds.com)
Cosmetics manufacturer, SPA management, and distributor of skincare, anti-aging, slimming, men's, and makeup lines under private labels. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Roissy-en-France | 860 | 1981 | | 6 | [SERIMAX](https://www.tamtam.ai/c/serimax) (serimax.com)
Global leader in pipeline welding solutions, offering high quality automatic and manual welding services on land and sea, in tough conditions Specializes in innovative equipment | Industrial Machinery Manufacturing | 🇫🇷 Roissy-en-France | 748 | 1978 | | 7 | [Portalp](https://www.tamtam.ai/c/portalp) (portalp.com)
Designs, develops, and distributes automatic opening systems, from hydraulic operators to intelligent, high-tech automatic doors, with a global commercial network. | Automation Machinery Manufacturing | 🇫🇷 Domont | 713 | 1962 | | 8 | [Balt](https://www.tamtam.ai/c/balt) (baltgroup.com)
Leading developer neurovascular solutions for ischemic and hemorrhagic stroke, and peripheral embolization, collaborating with physicians, expanding global medical device portfolio. | Medical Equipment Manufacturing | 🇫🇷 Montmorency | 612 | 1977 | | 9 | [CERBA](https://www.tamtam.ai/c/cerba) (lab-cerba.com)
European leader in specialized clinical pathology, offering a wide range of tests to private and hospital labs in over 50 countries Partnering for innovation and research | Medical and Diagnostic Laboratories | 🇫🇷 Frépillon | 561 | 1967 | | 10 | [CY Tech](https://www.tamtam.ai/c/cy-tech) (cytech.cyu.fr)
CY Tech is a leading institution in Sciences, Engineering, Economics, and Management with multiple campuses, formed from the merger of EISTI and UCP | Higher Education | 🇫🇷 Cergy | 368 | 2020 | | 11 | [BERNARD CONTROLS](https://www.tamtam.ai/c/bernard-controls) (bernardcontrols.com)
World leader in electric actuation, specialized in Nuclear, Power Generation, Water, Industries, Oil & Gas markets, with a strong international network. | Industrial Machinery Manufacturing | 🇫🇷 Gonesse | 336 | 1936 | | 12 | [JRI](https://www.tamtam.ai/c/jri) (jri-mms.com)
Develops temperature monitoring solutions for thermo-sensitive products in healthcare, food, and industry, utilizing IoT technology and offering metrology services. | Measuring and Control Instrument Manufacturing | 🇫🇷 Bezons | 298 | 1845 | | 13 | [Telma](https://www.tamtam.ai/c/telma) (telma.com)
Design and manufacture of electromagnetic induction braking systems enhancing vehicle safety, reducing maintenance, and improving road transport efficiency worldwide. | Motor Vehicle Manufacturing | 🇫🇷 Saint-Ouen-l'Aumône | 266 | 1946 | | 14 | [POMMIER](https://www.tamtam.ai/c/pommier) (pommier.eu)
A leading specialist in industrial vehicle bodywork equipment, offering a wide range of products designed and manufactured in-house since 1945 | Motor Vehicle Parts Manufacturing | 🇫🇷 Beauchamp | 250 | 1945 | | 15 | [NOVÉAL-L'Oréal Groupe](https://www.tamtam.ai/c/noveal-l-oreal-groupe) (noveal.com)
Develops and guarantees exclusive, high-performance ingredients for global beauty consumers, utilizing sustainable chemistry, biotechnologies, and innovative green technologies for responsible and sustainable beauty. | Personal Care Product Manufacturing | 🇫🇷 Le Thillay | 250 | 1938 | | 16 | [Ecole nationale supérieure de l'Electronique et de ses Applications](https://www.tamtam.ai/c/ecole-nationale-superieure-de-l-electronique-et-de-ses-applications) (ensea.fr)
This company offers high-quality engineering education with a focus on expertise, inclusivity, and sustainability, fostering innovation and responsible professionals in a supportive environment | Higher Education | 🇫🇷 Cergy | 249 | 1952 | | 17 | [Laroche Group](https://www.tamtam.ai/c/laroche-group) (laroche-group.com)
Offers complex machining, production engineering, and aerostructures assembly, supporting European industry leaders in major projects across aeronautics, space, automotive, telecoms, and rail. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Andilly | 240 | 1999 | | 18 | [Sto France](https://www.tamtam.ai/c/sto-france) (sto.fr)
Development of innovative products and systems for facade renovation and cladding, focusing on responsible building and aesthetic preservation. | Construction | 🇫🇷 Bezons | 236 | | | 19 | [PXP™ - PROJECT X PARIS™](https://www.tamtam.ai/c/pxp-project-x-paris) (projectxparis.com)
premium streetwear brand offering durable, high-quality fashion for all genders, collaborating with artists, and expanding omnichannel retail presence. | Textile Manufacturing | 🇫🇷 Roissy-en-France | 227 | 2015 | | 20 | [Total](https://www.tamtam.ai/c/total) (totalenergies.com)
Promoting environmentally-friendly practices and sustainability | Computer and Network Security | 🇫🇷 Parmain | 184 | | | 21 | [RIBER](https://www.tamtam.ai/c/riber) (riber.com)
Supplier of molecular beam epitaxy equipment and evaporation sources for semiconductor research, industrial applications, and innovative device manufacturing worldwide. | Semiconductor Manufacturing | 🇫🇷 Bezons | 183 | 1964 | | 22 | [CAME France](https://www.tamtam.ai/c/came-france) (came.com)
Development and supply of integrated automation systems for residential, public, and urban environments including access control, security, and parking management. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Cormeilles-en-Parisis | 173 | | | 23 | [CURVER](https://www.tamtam.ai/c/curver) (curver.com)
European market leader in plastic household products, focusing on design and innovation to create user-friendly and fun solutions for home and leisure | Manufacturing | 🇫🇷 Roissy-en-France | 165 | 1949 | | 24 | [Yon-Ka Paris](https://www.tamtam.ai/c/yon-ka-paris) (yonka.fr)
Development and provision of natural, effective phyto-aromatic skincare treatments and products promoting holistic beauty and emotional harmony. | Personal Care Product Manufacturing | 🇫🇷 Argenteuil | 156 | 1954 | | 25 | [PREVOR](https://www.tamtam.ai/c/prevor) (prevor.com)
Maximizing safety for individuals exposed to chemical burns and risks through research, solutions, and training in prevention and first aid equipment development. | Chemical Manufacturing | 🇫🇷 Valmondois | 151 | 1959 | | 26 | [URMET FRANCE](https://www.tamtam.ai/c/urmet-france) (urmet.fr)
Provides reliable intercom, access control, video surveillance, and home automation solutions with technical support, training, and extensive distribution network. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Roissy-en-France | 143 | 1984 | | 27 | [VYGON France](https://www.tamtam.ai/c/vygon-france) (vygon.com)
Design, production, and distribution of high-tech single-use medical devices supporting healthcare professionals for patient safety and care quality. | Medical Equipment Manufacturing | 🇫🇷 Ecouen | 140 | | | 28 | [Filpack](https://www.tamtam.ai/c/filpack) (filpack.fr)
French leader providing protection, packaging, and conditioning equipment for agriculture, food industry, and industrial logistics with engineering services. | Packaging and Containers Manufacturing | 🇫🇷 Pierrelaye | 118 | 1977 | | 29 | [SOPAC](https://www.tamtam.ai/c/sopac) (sopac.com)
Specializing in temperature measurement devices and solutions for food, transportation, and healthcare industries to ensure product safety and quality control Offering a wide range of products and services | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Argenteuil | 118 | 1978 | | 30 | [Novair](https://www.tamtam.ai/c/novair) (novair.fr)
manufacture on-site oxygen and nitrogen generators for hospitals and industries, enabling independent, eco-friendly gas supply management worldwide | Industrial Machinery Manufacturing | 🇫🇷 Roissy-en-France | 113 | 1977 | ## 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 Val-d'Oise department - [The largest companies in the Val-d'Oise department](https://www.tamtam.ai/l/largest-companies-val-doise) (849) - [Multinational companies in the Val-d'Oise department](https://www.tamtam.ai/l/multinational-companies-val-doise) (128) - [Manufacturers in the Val-d'Oise department](https://www.tamtam.ai/l/manufacturers-val-doise) (85) - [Hardware manufacturers in the Val-d'Oise department](https://www.tamtam.ai/l/hardware-companies-val-doise) (70) - [Distributors and wholesalers in the Val-d'Oise department](https://www.tamtam.ai/l/distributors-and-wholesalers-val-doise) (67) - [Retail chains in the Val-d'Oise department](https://www.tamtam.ai/l/retail-chains-val-doise) (56) - [Professional services firms in the Val-d'Oise department](https://www.tamtam.ai/l/professional-services-firms-val-doise) (44) - [Family-owned companies in the Val-d'Oise department](https://www.tamtam.ai/l/family-owned-companies-val-doise) (42) - [IT services companies in the Val-d'Oise department](https://www.tamtam.ai/l/it-services-companies-val-doise) (42) - [IT Services and IT Consulting companies in the Val-d'Oise department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-val-doise) (38) - [Transportation, Logistics, Supply Chain and Storage companies in the Val-d'Oise department](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-val-doise) (33) - [Aerospace and defence companies in the Val-d'Oise department](https://www.tamtam.ai/l/aerospace-and-defense-companies-val-doise) (31) - [Public sector organisations in the Val-d'Oise department](https://www.tamtam.ai/l/public-sector-organisations-val-doise) (30) - [Construction companies in the Val-d'Oise department](https://www.tamtam.ai/l/construction-companies-val-doise) (29) - [Wholesale companies in the Val-d'Oise department](https://www.tamtam.ai/l/wholesale-companies-val-doise) (29) - [Healthcare providers in the Val-d'Oise department](https://www.tamtam.ai/l/healthcare-providers-val-doise) (27) - [Industrial Machinery Manufacturing companies in the Val-d'Oise department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-val-doise) (27) - [Government Administration companies in the Val-d'Oise department](https://www.tamtam.ai/l/government-administration-companies-val-doise) (26) - [Logistics companies in the Val-d'Oise department](https://www.tamtam.ai/l/logistics-companies-val-doise) (25) ## 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 Île-de-France](https://www.tamtam.ai/l/r-and-d-companies-ile-de-france) (2,695) - [Companies with in-house R&D in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/r-and-d-companies-auvergne-rhone-alpes) (1,460) - [Companies with in-house R&D in Occitanie](https://www.tamtam.ai/l/r-and-d-companies-occitanie) (680) - [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-Côte 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 Hauts-de-Seine department](https://www.tamtam.ai/l/r-and-d-companies-hauts-de-seine) (510) - [Companies with in-house R&D in the Rhône 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-Rhône department](https://www.tamtam.ai/l/r-and-d-companies-bouches-du-rhone) (320) - [Companies with in-house R&D in the Isère department](https://www.tamtam.ai/l/r-and-d-companies-isere) (304) - [Companies with in-house R&D in Bourgogne-Franche-Comté](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) - [Companies with in-house R&D in the Essonne department](https://www.tamtam.ai/l/r-and-d-companies-essonne) (198) - [Companies with in-house R&D in Centre-Val de Loire](https://www.tamtam.ai/l/r-and-d-companies-centre-val-de-loire) (195) - [Companies with in-house R&D in Paris](https://www.tamtam.ai/l/r-and-d-companies-paris) (1,249) - [Companies with in-house R&D in Lyon](https://www.tamtam.ai/l/r-and-d-companies-lyon) (192) ## 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) --- Source: https://www.tamtam.ai/l/r-and-d-companies-val-doise