# 30 leading companies with in-house R&D in Nantes
Tamtam tracks 78 companies with in-house R&D headquartered in Nantes. This list ranks the 30 largest by number of employees on LinkedIn, led by CHU de Nantes, Nantes Universit茅 and 饾棜饾棙饾棦饾棛饾棞饾棫. Their median headcount is 195. Half of them were founded in 2003 or later.
These Nantes-based companies with in-house R&D span several sectors, including healthcare, higher education, engineering, and software development. The list features a mix of large institutions like CHU de Nantes, which specializes in scientific research and patient assistance, and Nantes Universit茅, a hub for education and innovation. Mid-sized firms such as GEOFIT, involved in geographical databases, and ACB, specializing in metal forming for aeronautical structures, are also present.
A notable pattern is the strong presence of both public and private institutions dedicated to healthcare and education. Companies like L'H么pital Priv茅 du Confluent and Centrale Nantes contribute significantly to the local economy. Additionally, there is a cluster of engineering firms like F脡TIS Group, focusing on decarbonization, and Edeis, specializing in construction solutions, indicating a diverse yet interconnected research landscape in Nantes.
馃嚝馃嚪 Nantes 路 30 companies 路 Updated Nov 12, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [CHU de Nantes](https://www.tamtam.ai/c/chu-de-nantes) (chu-nantes.fr)
The company specializes in technical collaborations, continuing education, scientific research, and assistance for foreign patients in the field of international affairs | Hospitals and Health Care | 馃嚝馃嚪 Nantes | 5,305 | 1503 |
| 2 | [Nantes Universit茅](https://www.tamtam.ai/c/nantes-universite) (univ-nantes.fr)
Unites higher education, research, and innovation stakeholders to develop research excellence, especially for future health and industry, offering new training opportunities. | Higher Education | 馃嚝馃嚪 Nantes | 4,270 | 1460 |
| 3 | [饾棜饾棙饾棦饾棛饾棞饾棫](https://www.tamtam.ai/c/company-nantes) (geofit.fr)
Designing geographical databases, securing land processes for private and development projects, producing national cartography, developing agriculture, and managing natural resources. | Space Research and Technology | 馃嚝馃嚪 Nantes | 1,157 | 1968 |
| 4 | [L'H么pital Priv茅 du Confluent - Vivalto Sant茅](https://www.tamtam.ai/c/l-hopital-prive-du-confluent-vivalto-sante) (hopitalpriveconfluent.vivalto-sante.com)
It offers consultation and hospitalization in short-stay medicine, surgery, oncology, and cardiology, with 24/7 emergency services, employing 200 practitioners and 1,100 employees. | Hospitals and Health Care | 馃嚝馃嚪 Nantes | 644 | 2003 |
| 5 | [ACB](https://www.tamtam.ai/c/acb) (acb-ps.com)
A company based in France specializing in metal forming for aeronautical structures, engines, and aircraft manufacturing Offers simulation, design, construction, and installation services | Mechanical Or Industrial Engineering | 馃嚝馃嚪 Nantes | 607 | |
| 6 | [Centrale Nantes](https://www.tamtam.ai/c/centrale-nantes) (ec-nantes.fr)
Trains versatile engineers with high scientific, technical levels and strong managerial culture, integrating environmental, societal issues into global contexts. | Higher Education | 馃嚝馃嚪 Nantes | 600 | 1919 |
| 7 | [F脡TIS Group](https://www.tamtam.ai/c/fetis-group) (fetis.group)
Provides engineering products and services for off-road machinery, specialized vehicles, power generation, marine power, and manufacturing industries with focus on decarbonization. | Engineering Services | 馃嚝馃嚪 Nantes | 501 | 1978 |
| 8 | [Akeneo](https://www.tamtam.ai/c/akeneo) (akeneo.com)
Empowering business leaders with software, education, and community for product experience management. Offering intelligent Product Cloud for data enrichment, management, and syndication. | Software Development | 馃嚝馃嚪 Nantes | 427 | 2013 |
| 9 | [Edeis](https://www.tamtam.ai/c/edeis) (edeis.com)
Specializing in engineering, operation, and construction solutions for the future, this company aims to become a leader in construction services and technical management | Engineering Services | 馃嚝馃嚪 Nantes | 412 | 2016 |
| 10 | [Eurofins Analyses Alimentaires France](https://www.tamtam.ai/c/eurofins-analyses-alimentaires-france) (eurofins.fr)
It provides analysis, expertise, audits, and training for food quality, safety, and authenticity, with a strong laboratory network across France. | Biotechnology Research | 馃嚝馃嚪 Nantes | 334 | 1987 |
| 11 | [Obat](https://www.tamtam.ai/c/obat) (obat.fr)
Specialized invoicing software designed for contractors and self-employed individuals within the construction sector Streamlining financial processes and improving efficiency | Software Development | 馃嚝馃嚪 Nantes | 274 | 2019 |
| 12 | [MADIC SAS](https://www.tamtam.ai/c/madic-sas) (groupe.madic.com)
A French leader in payment and petrol equipment and services, providing customized solutions for gas stations, renovations, and compliance updates across France, Spain, and Belgium | Oil and Gas | 馃嚝馃嚪 Nantes | 237 | 1971 |
| 13 | [Vaillant Group France](https://www.tamtam.ai/c/vaillant-group-france) (jobs.vaillant-group.com)
Development and manufacturing of heating and cooling systems focused on renewable energy, providing comfort and customized solutions in France. | Renewable Energy Equipment Manufacturing | 馃嚝馃嚪 Nantes | 205 | |
| 14 | [COCERTO](https://www.tamtam.ai/c/cocerto) (cocerto.fr)
Provides comprehensive accounting, audit, payroll, legal support, and digital tools to optimize and secure business operations with personalized service. | Accounting | 馃嚝馃嚪 Nantes | 200 | 1971 |
| 15 | [Polysoude S.A.S](https://www.tamtam.ai/c/polysoude-s-a-s) (polysoude.com)
Designs, manufactures, and markets equipment for arc welding processes in various industries worldwide, with a focus on high-quality, innovative solutions | Automation Machinery Manufacturing | 馃嚝馃嚪 Nantes | 195 | 1961 |
| 16 | [MECA](https://www.tamtam.ai/c/meca-nantes) (cluster-meca.fr)
A cluster of companies offering mechanical analysis expertise to ensure safety and feasibility of constructions through material behavior, design, and stress calculation | Business Consulting and Services | 馃嚝馃嚪 Nantes | 194 | 2006 |
| 17 | [iAdvize](https://www.tamtam.ai/c/iadvize) (iadvize.com)
Building AI shopping assistants, transforming digital conversations into over $1 billion in annual online revenue for e-commerce brands. | Technology, Information and Internet | 馃嚝馃嚪 Nantes | 184 | 2010 |
| 18 | [Lengow](https://www.tamtam.ai/c/lengow) (lengow.com)
E-commerce automation solution enabling brands to improve performance, automate processes, and expand internationally by integrating with 200+ marketplaces and 1,400+ channels | Software Development | 馃嚝馃嚪 Nantes | 177 | 2009 |
| 19 | [EVEA](https://www.tamtam.ai/c/evea) (evea-conseil.com)
Assists organizations in enhancing environmental and social performance of products, services, and activities through consulting, software tools, and training. | Business Consulting and Services | 馃嚝馃嚪 Nantes | 167 | 2005 |
| 20 | [Leroux & Lotz Technologies (LLT)](https://www.tamtam.ai/c/leroux-and-lotz-technologies-llt) (lerouxlotz.com)
Design and manufacture of custom biomass boilers and combustion systems, including maintenance, refurbishment, and complete rebuild services. | Utility System Construction | 馃嚝馃嚪 Nantes | 149 | 1946 |
| 21 | [KOSMOS](https://www.tamtam.ai/c/kosmos-nantes) (kosmos-education.com)
Specializing in digital education solutions, this company implements web portals, e-portfolios, mobile apps, and other digital tools for schools | IT Services and IT Consulting | 馃嚝馃嚪 Nantes | 141 | 1998 |
| 22 | [proLogistik France (DSIA)](https://www.tamtam.ai/c/prologistik-france-dsia) (logistar-dsia.com)
French subsidiary of a pan-European group, publishing, integrating, and hosting supply chain solutions, including WMS, OMS, LMS, TMS, ensuring optimal security and accessibility. | Software Development | 馃嚝馃嚪 Nantes | 114 | 1985 |
| 23 | [SafeRail SAS](https://www.tamtam.ai/c/saferail-sas) (saferail.fr)
A leading French company in railway control and signaling engineering, serving public and private infrastructure managers with a focus on safety and quality | Rail Transportation | 馃嚝馃嚪 Nantes | 109 | 2003 |
| 24 | [NRGYS](https://www.tamtam.ai/c/nrgys) (nrgys.fr)
Independent Engineering Firm in Energy Efficiency & Building Intelligence, providing tools, expertise, and services for thermal studies, energy performance, and fluid design in various sectors | Environmental Services | 馃嚝馃嚪 Nantes | 107 | 2005 |
| 25 | [MyScript](https://www.tamtam.ai/c/myscript) (myscript.com)
Leader in real-time handwriting recognition using AI, offering interactive ink technology for digital content creation across various industries Innovating natural human-machine interfaces | Software Development | 馃嚝馃嚪 Nantes | 93 | 1998 |
| 26 | [PerformanSe](https://www.tamtam.ai/c/performanse) (performanse.com)
A leader in behavioral and cognitive skills assessments, providing innovative solutions for HR professionals in recruitment, talent management, and vocational guidance | Software Development | 馃嚝馃嚪 Nantes | 86 | 1988 |
| 27 | [OSE Immunotherapeutics](https://www.tamtam.ai/c/ose-immunotherapeutics) (ose-immuno.com)
Develops first-in-class assets in immuno-oncology and immuno-inflammation, including therapeutic cancer vaccines, monoclonal antibodies for solid tumors, ulcerative colitis, and chronic inflammation, and transplant. | Biotechnology Research | 馃嚝馃嚪 Nantes | 81 | 2012 |
| 28 | [KoralPlay](https://www.tamtam.ai/c/koralplay) (koralplay.com)
An experienced gaming technology partner providing omnichannel solutions, customized games, and comprehensive support for sports betting, gaming, and lottery operators globally | Software Development | 馃嚝馃嚪 Nantes | 72 | 2017 |
| 29 | [Beem](https://www.tamtam.ai/c/beem-nantes) (beemenergy.fr)
Helping individuals take charge of their energy consumption and accelerate the transition to cleaner energy sources for homes | Solar Electric Power Generation | 馃嚝馃嚪 Nantes | 70 | 2018 |
| 30 | [Weenat](https://www.tamtam.ai/c/weenat) (weenat.com)
Weenat provides simple, mobile, and connected solutions for farmers, using weather and soil data to optimize decision-making from planting to harvest | Farming | 馃嚝馃嚪 Nantes | 69 | 2014 |
## 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
- [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 the Hauts-de-Seine department](https://www.tamtam.ai/l/r-and-d-companies-hauts-de-seine) (510)
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- [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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## 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)
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Source: https://www.tamtam.ai/l/r-and-d-companies-nantes