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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 Université and 𝗚𝗘𝗢𝗙𝗜𝗧. Their median headcount is 195. Half of them were founded in 2003 or later.

🇫🇷 Nantes30 companiesUpdated Nov 12, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
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

Hospitals and Health Care 🇫🇷 Nantes 5,305 1503
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.

Higher Education 🇫🇷 Nantes 4,270 1460
3
𝗚𝗘𝗢𝗙𝗜𝗧geofit.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 🇫🇷 Nantes 1,157 1968
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.

Hospitals and Health Care 🇫🇷 Nantes 644 2003
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

Mechanical Or Industrial Engineering 🇫🇷 Nantes 607 n/a
6
Centrale Nantesec-nantes.fr

Trains versatile engineers with high scientific, technical levels and strong managerial culture, integrating environmental, societal issues into global contexts.

Higher Education 🇫🇷 Nantes 600 1919
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.

Engineering Services 🇫🇷 Nantes 501 1978
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.

Software Development 🇫🇷 Nantes 427 2013
9
Edeisedeis.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 🇫🇷 Nantes 412 2016
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.

Biotechnology Research 🇫🇷 Nantes 334 1987
11
Obatobat.fr

Specialized invoicing software designed for contractors and self-employed individuals within the construction sector Streamlining financial processes and improving efficiency

Software Development 🇫🇷 Nantes 274 2019
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

Oil and Gas 🇫🇷 Nantes 237 1971
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.

Renewable Energy Equipment Manufacturing 🇫🇷 Nantes 205 n/a
14
COCERTOcocerto.fr

Provides comprehensive accounting, audit, payroll, legal support, and digital tools to optimize and secure business operations with personalized service.

Accounting 🇫🇷 Nantes 200 1971
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

Automation Machinery Manufacturing 🇫🇷 Nantes 195 1961

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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

Business Consulting and Services 🇫🇷 Nantes 194 2006
17
iAdvizeiadvize.com

Building AI shopping assistants, transforming digital conversations into over $1 billion in annual online revenue for e-commerce brands.

Technology, Information and Internet 🇫🇷 Nantes 184 2010
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

Software Development 🇫🇷 Nantes 177 2009
19
EVEAevea-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 🇫🇷 Nantes 167 2005
20
Leroux & 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 🇫🇷 Nantes 149 1946
21
KOSMOSkosmos-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 🇫🇷 Nantes 141 1998
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.

Software Development 🇫🇷 Nantes 114 1985
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

Rail Transportation 🇫🇷 Nantes 109 2003
24
NRGYSnrgys.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 🇫🇷 Nantes 107 2005
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

Software Development 🇫🇷 Nantes 93 1998
26
PerformanSeperformanse.com

A leader in behavioral and cognitive skills assessments, providing innovative solutions for HR professionals in recruitment, talent management, and vocational guidance

Software Development 🇫🇷 Nantes 86 1988
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.

Biotechnology Research 🇫🇷 Nantes 81 2012
28
KoralPlaykoralplay.com

An experienced gaming technology partner providing omnichannel solutions, customized games, and comprehensive support for sports betting, gaming, and lottery operators globally

Software Development 🇫🇷 Nantes 72 2017
29
Beembeemenergy.fr

Helping individuals take charge of their energy consumption and accelerate the transition to cleaner energy sources for homes

Solar Electric Power Generation 🇫🇷 Nantes 70 2018
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

Farming 🇫🇷 Nantes 69 2014

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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.

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