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 Université, 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'Hôpital Privé du Confluent and Centrale Nantes contribute significantly to the local economy. Additionally, there is a cluster of engineering firms like FÉTIS Group, focusing on decarbonization, and Edeis, specializing in construction solutions, indicating a diverse yet interconnected research landscape in Nantes.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
CHU de Nanteschu-nantes.fr
The company specializes in technical collaborations, continuing education, scientific research, and assistance for foreign patients in the field of international affairs |
5,305 | |||
| 2 |
Nantes Universitéuniv-nantes.fr
Unites higher education, research, and innovation stakeholders to develop research excellence, especially for future health and industry, offering new training opportunities. |
4,270 | |||
| 3 | 1,157 | ||||
| 4 |
L'Hôpital Privé du Confluent - Vivalto Santéhopitalpriveconfluent.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. |
644 | |||
| 5 |
ACBacb-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 |
607 | |||
| 6 |
Centrale Nantesec-nantes.fr
Trains versatile engineers with high scientific, technical levels and strong managerial culture, integrating environmental, societal issues into global contexts. |
600 | |||
| 7 |
FÉTIS Groupfetis.group
Provides engineering products and services for off-road machinery, specialized vehicles, power generation, marine power, and manufacturing industries with focus on decarbonization. |
501 | |||
| 8 |
Akeneoakeneo.com
Empowering business leaders with software, education, and community for product experience management. Offering intelligent Product Cloud for data enrichment, management, and syndication. |
427 | |||
| 9 | 412 | ||||
| 10 |
Eurofins Analyses Alimentaires Franceeurofins.fr
It provides analysis, expertise, audits, and training for food quality, safety, and authenticity, with a strong laboratory network across France. |
334 | |||
| 11 | 274 | ||||
| 12 |
MADIC SASgroupe.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 |
237 | |||
| 13 |
Vaillant Group Francejobs.vaillant-group.com
Development and manufacturing of heating and cooling systems focused on renewable energy, providing comfort and customized solutions in France. |
205 | |||
| 14 |
COCERTOcocerto.fr
Provides comprehensive accounting, audit, payroll, legal support, and digital tools to optimize and secure business operations with personalized service. |
200 | |||
| 15 |
Polysoude S.A.Spolysoude.com
Designs, manufactures, and markets equipment for arc welding processes in various industries worldwide, with a focus on high-quality, innovative solutions |
195 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
MECAcluster-meca.fr
A cluster of companies offering mechanical analysis expertise to ensure safety and feasibility of constructions through material behavior, design, and stress calculation |
194 | |||
| 17 |
iAdvizeiadvize.com
Building AI shopping assistants, transforming digital conversations into over $1 billion in annual online revenue for e-commerce brands. |
184 | |||
| 18 |
Lengowlengow.com
E-commerce automation solution enabling brands to improve performance, automate processes, and expand internationally by integrating with 200+ marketplaces and 1,400+ channels |
177 | |||
| 19 |
EVEAevea-conseil.com
Assists organizations in enhancing environmental and social performance of products, services, and activities through consulting, software tools, and training. |
167 | |||
| 20 |
Leroux & Lotz Technologies (LLT)lerouxlotz.com
Design and manufacture of custom biomass boilers and combustion systems, including maintenance, refurbishment, and complete rebuild services. |
149 | |||
| 21 |
KOSMOSkosmos-education.com
Specializing in digital education solutions, this company implements web portals, e-portfolios, mobile apps, and other digital tools for schools |
141 | |||
| 22 |
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. |
114 | |||
| 23 |
SafeRail SASsaferail.fr
A leading French company in railway control and signaling engineering, serving public and private infrastructure managers with a focus on safety and quality |
109 | |||
| 24 | 107 | ||||
| 25 |
MyScriptmyscript.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 |
93 | |||
| 26 |
PerformanSeperformanse.com
A leader in behavioral and cognitive skills assessments, providing innovative solutions for HR professionals in recruitment, talent management, and vocational guidance |
86 | |||
| 27 |
OSE Immunotherapeuticsose-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. |
81 | |||
| 28 |
KoralPlaykoralplay.com
An experienced gaming technology partner providing omnichannel solutions, customized games, and comprehensive support for sports betting, gaming, and lottery operators globally |
72 | |||
| 29 |
Beembeemenergy.fr
Helping individuals take charge of their energy consumption and accelerate the transition to cleaner energy sources for homes |
70 | |||
| 30 |
Weenatweenat.com
Weenat provides simple, mobile, and connected solutions for farmers, using weather and soil data to optimize decision-making from planting to harvest |
69 | |||
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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 Nantes
- The largest companies in Nantes 955
- SaaS companies in Nantes 90
- Professional services firms in Nantes 83
- Software Development companies in Nantes 71
- IT Services and IT Consulting companies in Nantes 65
- Multinational companies in Nantes 64
- IT services companies in Nantes 64
- Business Consulting and Services companies in Nantes 55
- Law Practice companies in Nantes 54
- Consulting firms in Nantes 51
- Public sector organisations in Nantes 51
- Education providers in Nantes 50
- Retail chains in Nantes 50
- Subscription businesses in Nantes 37
- Financial services firms in Nantes 33
- Real Estate companies in Nantes 33
- Recruitment and staffing agencies in Nantes 32
- Advertising Services companies in Nantes 32
- Companies with a mobile app in Nantes 31
- Higher Education companies in Nantes 29
- Technology, Information and Internet companies in Nantes 29
- Events Services companies in Nantes 28
- Critical infrastructure operators in Nantes 26
- Professional Training and Coaching companies in Nantes 25
The same list elsewhere in France
- Companies with in-house R&D in France 8,749
- Companies with in-house R&D in Île-de-France 2,695
- Companies with in-house R&D in Auvergne-Rhône-Alpes 1,460
- Companies with in-house R&D in Occitanie 680
- Companies with in-house R&D in Grand Est 640
- Companies with in-house R&D in Provence-Alpes-Côte d'Azur 612
- Companies with in-house R&D in Nouvelle-Aquitaine 566
- Companies with in-house R&D in the Hauts-de-Seine department 510
- Companies with in-house R&D in the Rhône department 509
- Companies with in-house R&D in Pays de la Loire 480
- Companies with in-house R&D in Hauts-de-France 410
- Companies with in-house R&D in Brittany 366
- Companies with in-house R&D in the Haute-Garonne department 323
- Companies with in-house R&D in the Bouches-du-Rhône department 320
- Companies with in-house R&D in the Isère department 304
- Companies with in-house R&D in Bourgogne-Franche-Comté 261
- Companies with in-house R&D in the Nord department 237
- Companies with in-house R&D in Normandy 227
- Companies with in-house R&D in the Gironde department 225
- Companies with in-house R&D in the Loire-Atlantique department 207
- Companies with in-house R&D in the Essonne department 198
- Companies with in-house R&D in Centre-Val de Loire 195
- Companies with in-house R&D in Paris 1,249
- Companies with in-house R&D in Lyon 192