# The 30 largest multinational companies in the Loire-Atlantique department

Tamtam tracks 159 multinational companies headquartered in the Loire-Atlantique department. This list ranks the 30 largest by number of employees on LinkedIn, led by Maisons du Monde, Nantes Université and Chantiers de l'Atlantique. Their median headcount is 625. Half of them were founded in 1982 or later. The most common headquarters are Nantes (14), Saint-Herblain (6) and Saint-Nazaire (2).

This selection of multinational companies in Loire-Atlantique includes large employers in shipbuilding, higher education, and IT services. Noteworthy firms include Chantiers de l'Atlantique, a marine construction company, and Nantes Université, a key player in research and education. Maisons du Monde specializes in home furnishings, while EURIAL, la branche Lait dAgrial, is a major dairy cooperative. Experis France provides IT services, and SERIS France focuses on security.

A significant concentration of these companies is found in Nantes, which serves as a hub for diverse sectors. Many of the listed organizations are well-established, with several founded in the mid-20th century or earlier, indicating a long-standing industrial and academic presence in the region.

🇫🇷 Loire-Atlantique · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Maisons du Monde](https://www.tamtam.ai/c/maisons-du-monde) (maisonsdumonde.com)<br>Designing and selling accessible, stylish, and sustainable home furnishings and decor collections, inspiring customers to create unique living spaces with a global influence. | Retail | 🇫🇷 Vertou | 4,273 | 1996 |
| 2 | [Nantes Université](https://www.tamtam.ai/c/nantes-universite) (univ-nantes.fr)<br>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 | [Chantiers de l'Atlantique](https://www.tamtam.ai/c/chantiers-de-l-atlantique) (chantiers-atlantique.com)<br>Marine construction company, building complex ships and marine installations, including passenger ships and substations. Global leader in design, manufacturing, and commissioning of innovative, environmentally friendly vessels. | Shipbuilding | 🇫🇷 Saint-Nazaire | 2,472 | 1861 |
| 4 | [Experis France](https://www.tamtam.ai/c/experis-france) (experisfrance.fr)<br>Supports DSI with innovative digital transformation projects, providing IT services and talent solutions to enhance organizational performance, addressing specific needs. | IT Services and IT Consulting | 🇫🇷 Nantes | 2,207 |  |
| 5 | [SERIS France](https://www.tamtam.ai/c/seris-france) (seris.fr)<br>Provides security services protecting assets and people for businesses and sensitive sectors, emphasizing service quality and professional development. | Security and Investigations | 🇫🇷 Saint-Nazaire | 1,951 | 1958 |
| 6 | [EURIAL, la branche Lait dAgrial](https://www.tamtam.ai/c/eurial-la-branche-lait-dagrial) (eurial.eu)<br>Leading French dairy cooperative, producing goat cheese, specialty butter, mozzarella, and a range of fresh dairy products. | Food and Beverage Manufacturing | 🇫🇷 Nantes | 1,754 | 1990 |
| 7 | [Audencia](https://www.tamtam.ai/c/audencia) (audencia.com)<br>A leading European business school offering management and communication programs from bachelor to doctoral level, committed to responsible education and development | Higher Education | 🇫🇷 Nantes | 1,232 | 1900 |
| 8 | [𝗚𝗘𝗢𝗙𝗜𝗧](https://www.tamtam.ai/c/company-nantes) (geofit.fr)<br>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 |
| 9 | [LACROIX - Electronics](https://www.tamtam.ai/c/lacroix-electronics) (lacroix-electronics.com)<br>Design and manufacture embedded electronics for diverse solutions, combining R&D with Industry 4.0 manufacturing in automotive, industrial, and healthcare sectors. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Saint-Herblain | 1,039 |  |
| 10 | [Sercel](https://www.tamtam.ai/c/sercel) (sercel.com)<br>Leading provider of high-standard subsurface measurement and data solutions for natural resources, infrastructure monitoring, energy transition, and defense sectors since 1956. | Manufacturing | 🇫🇷 Carquefou | 942 | 1956 |
| 11 | [Ministère des Affaires Etrangères](https://www.tamtam.ai/c/ministere-des-affaires-etrangeres) (diplomatie.gouv.fr)<br>A government administration company located in Nantes, France, focused on international affairs and relations | Government Administration | 🇫🇷 Nantes | 865 | 1500 |
| 12 | [Catamania](https://www.tamtam.ai/c/catamania) (catamania.com)<br>Provides digital transformation services, consulting, software publishing, and information system architecture for banking, insurance, and retail sectors across international agencies using diverse technical expertise. | IT Services and IT Consulting | 🇫🇷 Saint-Herblain | 797 | 1999 |
| 13 | [Valneva](https://www.tamtam.ai/c/valneva) (valneva.com)<br>Specialty vaccine company developing prophylactic vaccines for infectious diseases, including travel vaccines and candidates for Lyme disease, Zika virus, and more | Biotechnology Research | 🇫🇷 Saint-Herblain | 666 | 2013 |
| 14 | [CMF GROUPE](https://www.tamtam.ai/c/cmf-groupe) (cmf-groupe.com)<br>A leading industrial group specializing in constructing greenhouses, bioclimatic glass buildings for agriculture, research, retail, and international markets | Construction | 🇫🇷 Loireauxence | 651 | 1962 |
| 15 | [Sce Aménagement & Environnement](https://www.tamtam.ai/c/sce-amenagement-and-environnement) (sce.fr)<br>Sustainable development firm offering urban planning, civil engineering, and environmental services globally with 45+ years of experience and 500 professionals | Environmental Services | 🇫🇷 Nantes | 625 | 1982 |
| 16 | [Bessé](https://www.tamtam.ai/c/besse) (besse.fr)<br>An independent insurance brokerage company with over 60 years of experience, specializing in protecting businesses and employees with innovative solutions and quality services | Insurance | 🇫🇷 Nantes | 610 | 1960 |
| 17 | [ACB](https://www.tamtam.ai/c/acb) (acb-ps.com)<br>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 |  |
| 18 | [Centrale Nantes](https://www.tamtam.ai/c/centrale-nantes) (ec-nantes.fr)<br>Trains versatile engineers with high scientific, technical levels and strong managerial culture, integrating environmental, societal issues into global contexts. | Higher Education | 🇫🇷 Nantes | 600 | 1919 |
| 19 | [Abalone France](https://www.tamtam.ai/c/abalone-france) (abalone-interim.com)<br>Specialized in HR services, temporary work, recruitment, and training since 1991, this company focuses on satisfying client needs and increasing employee employability | Human Resources Services | 🇫🇷 Saint-Herblain | 549 | 1991 |
| 20 | [IMATECH](https://www.tamtam.ai/c/imatech) (ima.eu)<br>Development and integration of advanced technology solutions, software services, and digital transformation support for various industries and businesses. | Information Services | 🇫🇷 Nantes | 534 | 1999 |
| 21 | [SGT Groupe](https://www.tamtam.ai/c/sgt-groupe) (sgt-pet.com)<br>Production of food-grade RPET preforms and plastic packaging across 14 sites, focusing on reliable, innovative, and eco-friendly solutions. | Plastics Manufacturing | 🇫🇷 Rezé | 507 | 1981 |
| 22 | [FÉTIS Group](https://www.tamtam.ai/c/fetis-group) (fetis.group)<br>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 |
| 23 | [NEWCLIP TECHNICS](https://www.tamtam.ai/c/newclip-technics) (newcliptechnics.com)<br>Design manufacture and market innovative osteosynthesis implants for elective surgery and traumatology with focus on quality and performance. | Medical Equipment Manufacturing | 🇫🇷 Haute Goulaine | 500 | 2002 |
| 24 | [4CAD Group](https://www.tamtam.ai/c/4cad-group) (4cadgroup.com)<br>The company offers PLM, ERP, and IoT tools to help organizations optimize their information systems for increased industrial efficiency | Software Development | 🇫🇷 Bouguenais | 463 | 2004 |
| 25 | [SPI](https://www.tamtam.ai/c/spi) (spi-groupe.com)<br>A leading player in Painting and Waterproofing, serving major industrial sectors such as aerospace, rail, and maritime with 600 employees worldwide | Aviation and Aerospace Component Manufacturing | 🇫🇷 Malville | 433 | 1980 |
| 26 | [Akeneo](https://www.tamtam.ai/c/akeneo) (akeneo.com)<br>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 |
| 27 | [EBTrans](https://www.tamtam.ai/c/ebtrans) (ebtrans.com)<br>A European leader in transport and logistics of sensitive materials, offering tailored services in over 14 countries with a focus on respect, safety, and responsibility | Truck Transportation | 🇫🇷 Couëron | 422 | 1996 |
| 28 | [Air France HOP](https://www.tamtam.ai/c/air-france-hop) (wwws.airfrance.fr)<br>Regional airline subsidiary operating daily flights to over one hundred French and European destinations, formed by merging three regional carriers. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Nantes | 408 | 2013 |
| 29 | [Atlantic Ingénierie](https://www.tamtam.ai/c/atlantic-ingenierie) (atlantic-ingenierie.com)<br>Engineering firm specializing in energy and telecommunication network deployment, providing expert studies and support for projects of all sizes. | Business Consulting and Services | 🇫🇷 Saint-Herblain | 385 | 2001 |
| 30 | [AS 24](https://www.tamtam.ai/c/as-24) (as24.com)<br>Specialized fuel distribution network for heavy goods vehicles across 29 countries, offering secure transactions, competitive prices, and dedicated stations. | Oil and Gas | 🇫🇷 Saint-Herblain | 380 | 1988 |

## 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 11, 2026.

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Source: https://www.tamtam.ai/l/multinational-companies-loire-atlantique