# Top 30 companies with in-house R&D in the Seine-et-Marne department
Tamtam tracks 104 companies with in-house R&D headquartered in the Seine-et-Marne department. This list ranks the 30 largest by number of employees on LinkedIn, led by Grand H么pital de l'Est Francilien, ACRELEC and Fives Maintenance. Their median headcount is 124. Half of them were founded in 1985 or later. The most common headquarters are Lieusaint (3) and Serris (2).
The largest companies with in-house R&D in Seine-et-Marne include a mix of established industrial firms and younger technology-focused businesses. Key players are Grand H么pital de l'Est Francilien, an integrated hospital network; ACRELEC, a global technology company for retail; Fives Maintenance, specializing in industrial maintenance; and ENCRES DUBUIT, which develops specialized inks. These companies span healthcare, manufacturing, and IT services.
A notable pattern is the diversity of industries represented, from healthcare and chemical manufacturing to specialized machinery and agricultural solutions. For example, El茅phant Vert focuses on sustainable agriculture, while KLUBB GROUP designs professional vehicles. This suggests a varied economic landscape in Seine-et-Marne, supporting different types of research and development activities.
馃嚝馃嚪 Seine-et-Marne 路 30 companies 路 Updated Nov 14, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Grand H么pital de l'Est Francilien](https://www.tamtam.ai/c/grand-hopital-de-l-est-francilien) (ghef.fr)
Integrated hospital network providing extensive medical and psychiatric care across multiple sites, serving the northern Seine-et-Marne population. | Government Administration | 馃嚝馃嚪 Meaux | 904 | 2017 |
| 2 | [ACRELEC](https://www.tamtam.ai/c/acrelec) (acrelec.com)
Global technology company transforming customer experiences for restaurants and retail brands through innovative platforms that enhance engagement, efficiency, and operations globally | IT Services and IT Consulting | 馃嚝馃嚪 Saint Thibault des Vignes | 689 | 2004 |
| 3 | [Fives Maintenance](https://www.tamtam.ai/c/fives-maintenance) (fivesgroup.com)
Specializing in industrial maintenance for over twenty years, offering tailored solutions to ensure high availability of production facilities with a focus on safety and environmental responsibility | Commercial and Industrial Machinery Maintenance | 馃嚝馃嚪 Mont茅vrain | 495 | 1997 |
| 4 | [ENCRES DUBUIT](https://www.tamtam.ai/c/encres-dubuit) (encresdubuit.com)
Development and manufacturing of specialized inks for electronics, packaging, automotive, and industrial applications with environmental responsibility and innovation focus. | Chemical Manufacturing | 馃嚝馃嚪 Mitry-Mory | 330 | 1954 |
| 5 | [Fondation Ellen Poidatz](https://www.tamtam.ai/c/fondation-ellen-poidatz) (fondationpoidatz.com)
Management of pediatric rehabilitation centers, support for disabled children and adults, adapted schooling, and research in healthcare innovation. | Hospitals and Health Care | 馃嚝馃嚪 Chailly-en-Bi猫re | 329 | 1919 |
| 6 | [El茅phant Vert](https://www.tamtam.ai/c/elephant-vert) (elephant-vert.com)
Develops and provides sustainable agricultural solutions, partnering with farmers to improve crop quality and harvest sustainability through innovative approaches. | Farming | 馃嚝馃嚪 Serris | 329 | 2012 |
| 7 | [KLUBB GROUP](https://www.tamtam.ai/c/klubb-group) (klubb.com)
Designs and converts professional vehicles into business solutions for aerial work platforms, refueling, and roadside assistance, focusing on innovation and sustainability. | Industrial Machinery Manufacturing | 馃嚝馃嚪 Ferri猫res-en-Brie | 265 | |
| 8 | [Techtronic Industries France - TTI](https://www.tamtam.ai/c/techtronic-industries-france-tti) (ttigroup.com)
A global leader in power tools, accessories, outdoor equipment, and floor care, serving professionals and DIY enthusiasts with premium brands | Manufacturing | 馃嚝馃嚪 Le Mesnil-Amelot | 173 | 1989 |
| 9 | [SMC France](https://www.tamtam.ai/c/smc-france) (smc.eu)
Manufacture and supply of pneumatic automation components including actuators, valves, connectors, air treatment, vacuum and fluid products with personalized service. | Automation Machinery Manufacturing | 馃嚝馃嚪 Bussy-Saint-Georges | 164 | 1988 |
| 10 | [JACIR](https://www.tamtam.ai/c/jacir) (jacir.fr)
With over 60 years of expertise, the company offers a diverse range of water cooling solutions, incorporating environmental requirements and providing dedicated services to clients worldwide | Mechanical Or Industrial Engineering | 馃嚝馃嚪 Pontault-Combault | 159 | 1959 |
| 11 | [AS INTERNATIONAL](https://www.tamtam.ai/c/as-international) (as-inter.com)
A global network offering quality solutions in textile, clothing, home, and leisure industries for manufacturers, brands, and distributors through expertise and innovation | Transportation, Logistics, Supply Chain and Storage | 馃嚝馃嚪 Lieusaint | 148 | 1983 |
| 12 | [SCHILLER France](https://www.tamtam.ai/c/schiller-france) (mediprostore.com)
Development, production, and distribution of medical devices for cardio-pulmonary diagnosis, patient monitoring, and emergency medicine in France. | Medical Equipment Manufacturing | 馃嚝馃嚪 Bussy-Saint-Georges | 143 | 1974 |
| 13 | [ADR - ALCEN](https://www.tamtam.ai/c/adr-alcen) (adr-alcen.com)
Design and manufacture of high-precision ball bearings and integrated rotating systems for specialized industries including aeronautics, space, defense, medical, and energy. | Defense and Space Manufacturing | 馃嚝馃嚪 Thomery | 135 | 1925 |
| 14 | [STIHL France](https://www.tamtam.ai/c/stihl-france) (stihl.fr)
Design and manufacture of high-performance garden, forestry, and green space tools including chainsaws, trimmers, mowers, and blowers. | Machinery Manufacturing | 馃嚝馃嚪 Torcy | 127 | 1984 |
| 15 | [JPB SYSTEME](https://www.tamtam.ai/c/jpb-systeme) (jpb-systeme.com)
Design and manufacture of patented self-locking devices for aerospace applications, ensuring quality, customization, and easy removal with ratchets. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Montereau-sur-le-Jard | 124 | 1995 |
| 16 | [MULTIVAC France](https://www.tamtam.ai/c/multivac-france) (multivac.com)
Global leader in providing packaging solutions for food, healthcare, and industrial products, offering a wide range of technologies, automation, and quality control systems | Machinery Manufacturing | 馃嚝馃嚪 Bailly-Romainvilliers | 103 | 1974 |
| 17 | [ITQ GROUP](https://www.tamtam.ai/c/itq-group) (itqgroup.fr)
French group specializing in security integration and maintenance services for public and private sectors, offering a range of solutions such as video surveillance and access control | Security and Investigations | 馃嚝馃嚪 Serris | 99 | 2011 |
| 18 | [AREAL](https://www.tamtam.ai/c/areal) (areal-topkapi.com)
Develops SCADA software platform for monitoring automated processes in industry, environment, energy, building, infrastructure, and transport sectors, collaborating with partners globally. | Software Development | 馃嚝馃嚪 Savigny-le-Temple | 95 | 1989 |
| 19 | [MEIKO France](https://www.tamtam.ai/c/meiko-france) (meiko.com)
Development of professional washing, cleaning, disinfection techniques, and sustainable biowaste treatment systems supporting exceptional performance and hygiene worldwide. | Machinery Manufacturing | 馃嚝馃嚪 Coll茅gien | 92 | 1993 |
| 20 | [TAM GROUPE](https://www.tamtam.ai/c/tam-groupe) (tamgroupe.fr)
Specialist manufacturing and distribution of concrete construction products, supporting design, delivery, and installation across France with expert teams. | Construction | 馃嚝馃嚪 Moissy-Cramayel | 88 | |
| 21 | [GT Company](https://www.tamtam.ai/c/gt-company) (gtcompany.fr)
This company engages in the creation, manufacturing, importing, storage, distribution, and delivery of various products | International Trade and Development | 馃嚝馃嚪 Chessy | 86 | |
| 22 | [Cordia](https://www.tamtam.ai/c/cordia) (cordia.fr)
Specialized manufacturer and distributor providing a wide range of fire safety equipment, including alarms, firefighting tools, gas detection, training materials, and innovative products | Wholesale | 馃嚝馃嚪 Mitry-Mory | 86 | |
| 23 | [KOMPAN France](https://www.tamtam.ai/c/kompan-france) (kompan.com)
Design and provide custom playgrounds and free-access fitness areas to create engaging, inclusive public spaces for all ages. | Recreational Facilities | 馃嚝馃嚪 Dammarie-les-Lys | 82 | 1970 |
| 24 | [Aristide](https://www.tamtam.ai/c/aristide-lieusaint) (aristide.paris)
Specializes in retail lighting solutions enhancing customer experience and maximizing sales through over 10 years of sensory marketing expertise. | Architecture and Planning | 馃嚝馃嚪 Lieusaint | 81 | 2004 |
| 25 | [GEZE France](https://www.tamtam.ai/c/geze-france) (geze.fr)
Specialist in door and window systems offering compliant, sustainable, accessible products including automatic doors, window motors, and maintenance services. | Wholesale Building Materials | 馃嚝馃嚪 Servon | 73 | 1978 |
| 26 | [GAINERIE 91 - Groupe](https://www.tamtam.ai/c/gainerie-91-groupe) (gainerie91.com)
Specializing in handcrafted products for luxury brands, artisans at this company provide exceptional quality in leatherwork, woodwork, laquering, and more Customized designs meet client specifications | Packaging and Containers Manufacturing | 馃嚝馃嚪 Lieusaint | 73 | 1967 |
| 27 | [Beissier France](https://www.tamtam.ai/c/beissier-france) (beissier.fr)
Designs, manufactures, and markets ready-to-use and powder plasters for painters, focusing on quality, customer support, and sustainability. | Wholesale Building Materials | 馃嚝馃嚪 La Chapelle-la-Reine | 71 | 1872 |
| 28 | [ALTRAD PLETTAC MEFRAN 脡chafaudages](https://www.tamtam.ai/c/altrad-plettac-mefran-echafaudages) (altradplettacmefran.fr)
A leading provider in the construction and industrial sector, offering a wide range of scaffolding, safety equipment, and construction materials worldwide | Construction | 馃嚝馃嚪 Roissy-en-Brie | 65 | 1985 |
| 29 | [GEOSEC FRANCE](https://www.tamtam.ai/c/geosec-france) (geosec.fr)
Specializes in foundation soil consolidation using injection techniques combining research, technology, and innovation to ensure high-quality solutions. | Civil Engineering | 馃嚝馃嚪 Saint-Thibault-des-Vignes | 65 | 2011 |
| 30 | [CHAPSOL](https://www.tamtam.ai/c/chapsol) (chapsol.fr)
Providing intelligent, sustainable solutions for civil engineering, public works, rail infrastructure, building, and agricultural structures with innovative, tailored approaches. | Civil Engineering | 馃嚝馃嚪 Coubert | 64 | 1931 |
## 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.
## More company lists in the Seine-et-Marne department
- [The largest companies in the Seine-et-Marne department](https://www.tamtam.ai/l/largest-companies-seine-et-marne) (946)
- [Multinational companies in the Seine-et-Marne department](https://www.tamtam.ai/l/multinational-companies-seine-et-marne) (139)
- [Manufacturers in the Seine-et-Marne department](https://www.tamtam.ai/l/manufacturers-seine-et-marne) (100)
- [Hardware manufacturers in the Seine-et-Marne department](https://www.tamtam.ai/l/hardware-companies-seine-et-marne) (84)
- [Distributors and wholesalers in the Seine-et-Marne department](https://www.tamtam.ai/l/distributors-and-wholesalers-seine-et-marne) (82)
- [Retail chains in the Seine-et-Marne department](https://www.tamtam.ai/l/retail-chains-seine-et-marne) (68)
- [Construction companies in the Seine-et-Marne department](https://www.tamtam.ai/l/construction-companies-seine-et-marne) (57)
- [Public sector organisations in the Seine-et-Marne department](https://www.tamtam.ai/l/public-sector-organisations-seine-et-marne) (49)
- [Family-owned companies in the Seine-et-Marne department](https://www.tamtam.ai/l/family-owned-companies-seine-et-marne) (48)
- [Professional services firms in the Seine-et-Marne department](https://www.tamtam.ai/l/professional-services-firms-seine-et-marne) (41)
- [Government Administration companies in the Seine-et-Marne department](https://www.tamtam.ai/l/government-administration-companies-seine-et-marne) (39)
- [Industrial Machinery Manufacturing companies in the Seine-et-Marne department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-seine-et-marne) (34)
- [Wholesale companies in the Seine-et-Marne department](https://www.tamtam.ai/l/wholesale-companies-seine-et-marne) (34)
- [Critical infrastructure operators in the Seine-et-Marne department](https://www.tamtam.ai/l/critical-infrastructure-operators-seine-et-marne) (33)
- [Retail companies in the Seine-et-Marne department](https://www.tamtam.ai/l/retail-companies-seine-et-marne) (33)
- [Education providers in the Seine-et-Marne department](https://www.tamtam.ai/l/education-companies-seine-et-marne) (31)
- [IT Services and IT Consulting companies in the Seine-et-Marne department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-seine-et-marne) (31)
- [IT services companies in the Seine-et-Marne department](https://www.tamtam.ai/l/it-services-companies-seine-et-marne) (29)
- [Contract manufacturers in the Seine-et-Marne department](https://www.tamtam.ai/l/contract-manufacturers-seine-et-marne) (26)
- [Healthcare providers in the Seine-et-Marne department](https://www.tamtam.ai/l/healthcare-providers-seine-et-marne) (26)
- [Higher Education companies in the Seine-et-Marne department](https://www.tamtam.ai/l/higher-education-companies-seine-et-marne) (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) (8,747)
- [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) (1,459)
- [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) (639)
- [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 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 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)
- [Companies with in-house R&D in the Is猫re department](https://www.tamtam.ai/l/r-and-d-companies-isere) (304)
- [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)
- [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) (34,336)
- [Companies with in-house R&D in Europe](https://www.tamtam.ai/l/r-and-d-companies-in-europe) (20,166)
---
Source: https://www.tamtam.ai/l/r-and-d-companies-seine-et-marne