# The 100 largest companies in the Loire-Atlantique department

Tamtam tracks 2,046 companies headquartered in the Loire-Atlantique department. This list ranks the 100 largest by number of employees on LinkedIn, led by CHU de Nantes, Maisons du Monde and Nantes Université. Their median headcount is 607. Half of them were founded in 1990 or later. The most common headquarters are Nantes (50), Saint-Herblain (15) and Carquefou (4).

The largest companies in Loire-Atlantique operate across diverse sectors, including healthcare, retail, education, and manufacturing. Noteworthy examples include CHU de Nantes, specializing in scientific research and international collaborations, and Maisons du Monde, known for its accessible and sustainable home furnishings. Nantes Université focuses on higher education and research excellence, while Chantiers de l'Atlantique is a global leader in shipbuilding.

This selection of companies shows a concentration of headquarters in Nantes, with several significant employers also located in Vertou and Saint-Nazaire. The companies span various sizes, from long-established institutions like CHU de Nantes (founded 1503) and Nantes Université (founded 1460) to more recent ventures such as ICH (founded 2020) in sporting goods manufacturing.

🇫🇷 Loire-Atlantique · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [CHU de Nantes](https://www.tamtam.ai/c/chu-de-nantes) (chu-nantes.fr)<br>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 | [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 |
| 3 | [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 |
| 4 | [ICH](https://www.tamtam.ai/c/ich-nantes) (xormis.com)<br>A French brand dedicated to meeting the needs of athletes and sports enthusiasts with high-quality sportswear, equipment, and accessories, all crafted with passion and innovation | Sporting Goods Manufacturing | 🇫🇷 Nantes | 3,159 | 2020 |
| 5 | [Nantes Métropole](https://www.tamtam.ai/c/nantes-metropole) (linktr.ee)<br>This organization in Nantes and its metropolitan area aims to create a new development model, embracing solidarity, collaboration, creativity, and openness They provide updates on local news | Government Administration | 🇫🇷 Nantes | 2,524 | 2004 |
| 6 | [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 |
| 7 | [Caisse d'Epargne Bretagne Pays de Loire](https://www.tamtam.ai/c/caisse-d-epargne-bretagne-pays-de-loire) (caisse-epargne.fr)<br>Regional mutualist bank with 420 agencies, serving individuals and professionals, supporting local economy through business centers and specialized subsidiaries. | Banking | 🇫🇷 Orvault | 2,428 |  |
| 8 | [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 |  |
| 9 | [LNA Santé](https://www.tamtam.ai/c/lna-sante) (lna-sante.com)<br>Family-owned healthcare provider based in Nantes since 1990, offering care and support for individuals with fragility or loss of autonomy through various facilities | Hospitals and Health Care | 🇫🇷 Vertou | 2,080 | 1990 |
| 10 | [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 |
| 11 | [Credit Agricole Atlantique Vendee](https://www.tamtam.ai/c/credit-agricole-atlantique-vendee) (credit-agricole.fr)<br>A cooperative bank supporting local economic development in Loire-Atlantique and Vendée, focusing on human-centered long-term vision with a successful dynamic | Banking | 🇫🇷 Nantes | 1,851 |  |
| 12 | [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 |
| 13 | [U Logistique](https://www.tamtam.ai/c/u-logistique) (u-logistique.com)<br>A logistics company part of a major French food distributor group, storing, transporting, and delivering goods to their 1682 stores nationwide | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Carquefou | 1,754 | 2016 |
| 14 | [Propriétés Privées](https://www.tamtam.ai/c/proprietes-privees) (proprietes-privees.com)<br>Pioneer online real-estate network, training and supporting real-estate advisors across France with internet tools for unlimited commercial development. | Real Estate | 🇫🇷 Vertou | 1,700 | 2006 |
| 15 | [RCA](https://www.tamtam.ai/c/rca) (rca.fr)<br>Develops innovative software solutions for accounting professionals and their clients, streamlining management, advisory services, and digital transition for accounting firms. | Software Development | 🇫🇷 Saint-Herblain | 1,626 | 1999 |
| 16 | [MAISON DES AGES ET DES CULTURES](https://www.tamtam.ai/c/maison-des-ages-et-des-cultures) (mdac.fr)<br>Non-profit association based in Legé, France, focused on promoting intergenerational and intercultural exchanges and activities within the community | Individual and Family Services | 🇫🇷 Legé | 1,530 |  |
| 17 | [Warehouse Nantes](https://www.tamtam.ai/c/warehouse-nantes) (warehouse-nantes.fr)<br>Hybrid cultural space hosting concerts and club nights with eclectic music programming alongside professional corporate events like conferences, cocktails, and private seminars. | Events Services | 🇫🇷 Nantes | 1,494 | 2017 |
| 18 | [CIC Ouest](https://www.tamtam.ai/c/cic-ouest) (cic.fr)<br>A solidary and responsible bank in Western France, supporting regional projects for a more just and sustainable society Emphasizes innovation, proximity, and employee satisfaction | Banking | 🇫🇷 Nantes | 1,476 |  |
| 19 | [Leclerc Drive](https://www.tamtam.ai/c/leclerc-drive)<br>An individual and family services company in Clisson, France, offering drive-through shopping experiences at their location on RUE DE LA FONTAINE CALIN | Individual and Family Services | 🇫🇷 Clisson | 1,470 |  |
| 20 | [Région Pays de la Loire](https://www.tamtam.ai/c/region-pays-de-la-loire) (paysdelaloire.fr)<br>Regional government managing economic growth, cultural events, education, transport, innovation, and community services across diverse urban and rural areas. | Government Administration | 🇫🇷 Nantes | 1,457 |  |
| 21 | [Département de Loire-Atlantique](https://www.tamtam.ai/c/departement-de-loire-atlantique) (loire-atlantique.fr)<br>Provides local government administration and public services for the Loire-Atlantique region, managing community needs and regional development. | Government Administration | 🇫🇷 Nantes | 1,437 |  |
| 22 | [HOP!](https://www.tamtam.ai/c/hop) (hop.fr)<br>regional airline operating frequent flights from Roissy-CDG and Lyon, serving business and leisure travelers across France and Europe | Airlines and Aviation | 🇫🇷 Bouguenais | 1,326 |  |
| 23 | [GH \| GIRARD HERVOUET Constructeur exigeant et bienveillant](https://www.tamtam.ai/c/gh-girard-hervouet-constructeur-exigeant-et-bienveillant) (g-h.fr)<br>Specializes in metal framework, roofing, aluminum joinery, and cladding for new builds and renovations across western France. | Construction | 🇫🇷 Clisson | 1,278 | 1966 |
| 24 | [Kereis France](https://www.tamtam.ai/c/kereis-france) (kereisfrance.com)<br>Kereis France is a brokerage and management company specializing in individual loan insurance and personal protection services in France | Insurance | 🇫🇷 Saint-Herblain | 1,256 | 1991 |
| 25 | [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 |
| 26 | [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 |
| 27 | [MCI SAS](https://www.tamtam.ai/c/mci-sas) (mci.fr)<br>This company specializes in commercial and industrial refrigeration, climate engineering, and energy performance optimization for installations across various sectors. | HVAC and Refrigeration Equipment Manufacturing | 🇫🇷 Carquefou | 1,106 | 1963 |
| 28 | [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 |  |
| 29 | [cbp](https://www.tamtam.ai/c/cbp) (kereisfrance.com)<br>cbp recently rebranded to Kereis France Stay updated on their services and offerings by following them on their LinkedIn page | Insurance | 🇫🇷 Saint-Herblain | 943 | 1991 |
| 30 | [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 |
| 31 | [Académie de Nantes](https://www.tamtam.ai/c/academie-de-nantes) (ac-nantes.fr)<br>Manage education system for 889,000 students and 70,700 staff across five departments, focusing on professional training and high exam success rates. | Education Administration Programs | 🇫🇷 Nantes | 937 | 1962 |
| 32 | [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 |
| 33 | [Shops](https://www.tamtam.ai/c/shops-nantes) (go-shops.fr)<br>Shops simplifies online presence for merchants, connecting customers with local stores based on product search, promotions, and community recommendations | Technology, Information and Internet | 🇫🇷 Nantes | 810 | 2018 |
| 34 | [Groupe Alternance](https://www.tamtam.ai/c/groupe-alternance) (groupe-alternance.com)<br>Network of over 70 schools across France offering alternance-based higher education from Bac to Bac+5 with professional training. | Higher Education | 🇫🇷 Nantes | 799 | 1998 |
| 35 | [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 |
| 36 | [Adapeila](https://www.tamtam.ai/c/adapeila) (adapeila.fr)<br>Association supporting over 4,500 people with intellectual, autistic, psychic, and multiple disabilities, employing 2,000 staff across 60 professions. | Civic and Social Organizations | 🇫🇷 Nantes | 781 | 1955 |
| 37 | [Semitan](https://www.tamtam.ai/c/semitan) (semitan.fr)<br>A public-private entity managing public transport in Nantes, overseeing network construction, renovation, and coordination of all mobility services in the region | Urban Transit Services | 🇫🇷 Nantes | 727 | 1979 |
| 38 | [Centre Hospitalier de Saint-Nazaire](https://www.tamtam.ai/c/centre-hospitalier-de-saint-nazaire) (hopital-saintnazaire.fr)<br>Public hospital providing extensive medical, surgical, emergency, mental health, elderly care, and preventive services across multiple regional sites. | Hospitals and Health Care | 🇫🇷 Saint-Nazaire | 669 | 1730 |
| 39 | [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 |
| 40 | [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 |
| 41 | [RETRAVAILLER DANS L OUEST](https://www.tamtam.ai/c/retravailler-dans-l-ouest) (retravailler-ouest.fr)<br>Training organization providing certifications and personalized support for job seekers, employees, and students in managing their skills and career development | Professional Training and Coaching | 🇫🇷 Nantes | 647 | 1974 |
| 42 | [L'Hôpital Privé du Confluent - Vivalto Santé](https://www.tamtam.ai/c/l-hopital-prive-du-confluent-vivalto-sante) (hopitalpriveconfluent.vivalto-sante.com)<br>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 |
| 43 | [Bouygues Bâtiment Grand Ouest](https://www.tamtam.ai/c/bouygues-batiment-grand-ouest) (bouygues-batiment-grand-ouest.fr)<br>Construction and renovation of buildings and neighborhoods in Western France, focusing on sustainability, resource efficiency, and social responsibility. | Construction | 🇫🇷 Nantes | 642 |  |
| 44 | [U IRIS devient U TECH](https://www.tamtam.ai/c/u-iris-devient-u-tech) (u-emploi.com)<br>Management and innovation of the entire Groupement U IT system, supporting retail, supply chain, and digital transformation projects. | Software Development | 🇫🇷 Carquefou | 637 | 2011 |
| 45 | [Groupe IDEA](https://www.tamtam.ai/c/groupe-idea) (groupe-idea.com)<br>Provides bespoke, end-to-end logistics solutions for industrial companies, primarily in aerospace, energy, defense, shipbuilding, and agri-food bulk sectors. | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Montoir-de-Bretagne | 630 | 1919 |
| 46 | [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 |
| 47 | [IRSS](https://www.tamtam.ai/c/irss) (irss.fr)<br>Specializing in preparing students for entry into higher education in various fields, with 35 years of experience and multiple locations across France | Higher Education | 🇫🇷 Nantes | 618 | 1985 |
| 48 | [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 |
| 49 | [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 |  |
| 50 | [Groupe Sigma](https://www.tamtam.ai/c/groupe-sigma-la-chapelle-sur-erdre) (sigma.fr)<br>The company aims to enhance performance through digital impact, innovate eco-friendly solutions, and build digital ecosystems with expert dialogue | IT Services and IT Consulting | 🇫🇷 La Chapelle-sur-Erdre | 607 | 1972 |
| 51 | [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 |
| 52 | [ASI ®](https://www.tamtam.ai/c/asi) (asi.fr)<br>Working towards a responsible digital world dedicated to serving humanity | IT Services and IT Consulting | 🇫🇷 Saint-Herblain | 590 | 1993 |
| 53 | [Conserto](https://www.tamtam.ai/c/conserto) (conserto.pro)<br>Offers IT consulting and expertise services across cloud, digital, and embedded domains through consulting, delivery centers, and labs models. | IT Services and IT Consulting | 🇫🇷 Saint-Herblain | 555 | 2013 |
| 54 | [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 |
| 55 | [Oniris Nantes](https://www.tamtam.ai/c/oniris-nantes) (oniris-nantes.fr)<br>Educates veterinarians, superior technicians, and engineers in animal health, public health, food sciences, and bioprocesses, actively supporting 'one medicine, one health'. | Higher Education | 🇫🇷 Nantes | 543 | 2010 |
| 56 | [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 |
| 57 | [ENI Ecole Informatique](https://www.tamtam.ai/c/eni-ecole-informatique) (eni-ecole.fr)<br>Specializing in IT higher education for over 40 years, offering courses in Development and Systems & Networks with flexible learning opportunities and placement services | Higher Education | 🇫🇷 Saint-Herblain | 528 | 1981 |
| 58 | [Crédit Mutuel Loire Atlantique Centre Ouest](https://www.tamtam.ai/c/credit-mutuel-loire-atlantique-centre-ouest) (creditmutuel.fr)<br>Offers banking, insurance, mobile, automotive, and real estate services to individuals, businesses, and associations, supporting local projects and economy. | Banking | 🇫🇷 Nantes | 525 |  |
| 59 | [L'École de design Nantes Atlantique](https://www.tamtam.ai/c/l-ecole-de-design-nantes-atlantique) (lecolededesign.com)<br>Educates students in design, creation, innovation at bachelor's and master's levels, including vocational and executive programs for organizations. | Education Administration Programs | 🇫🇷 Nantes | 519 | 1988 |
| 60 | [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 |
| 61 | [DeCA Propreté](https://www.tamtam.ai/c/deca-proprete) (deca-proprete.fr)<br>Provides tailored cleaning and maintenance services to professional clients, ensuring high-quality results with advanced techniques and equipment. | Environmental Services | 🇫🇷 Treillières | 501 | 1996 |
| 62 | [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 |
| 63 | [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 |
| 64 | [Carsat Pays de la Loire](https://www.tamtam.ai/c/carsat-pays-de-la-loire) (carsat-pl.fr)<br>Regional social security organization managing retirement, social action, and occupational risk prevention for employees, retirees, and businesses in Pays de la Loire. | Government Administration | 🇫🇷 Nantes | 491 |  |
| 65 | [SCOP Titi Floris](https://www.tamtam.ai/c/scop-titi-floris) (les-titis.fr)<br>Cooperative specializing in transport and support for disabled people, vehicle rental and sales, social innovation projects, and shared community spaces. | Individual and Family Services | 🇫🇷 Orvault | 480 | 2006 |
| 66 | [Saint-Nazaire Ville & Agglo](https://www.tamtam.ai/c/saint-nazaire-ville-and-agglo) (saintnazaire.fr)<br>Coastal city blending ocean, industry, history, and culture to offer vibrant experiences, economic vitality, and community spirit for residents and visitors. | Government Administration | 🇫🇷 Saint-Nazaire | 474 |  |
| 67 | [swimming pool](https://www.tamtam.ai/c/swimming-pool-nantes) (bit.ly)<br>Integrated communication and marketing agency helping B2B organizations with brand strategy, creative content, digital data, lead generation, and hybrid events. | Advertising Services | 🇫🇷 Nantes | 465 | 2005 |
| 68 | [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 |
| 69 | [Clinique Jules Verne](https://www.tamtam.ai/c/clinique-jules-verne) (cliniquejulesverne.fr)<br>Clinique Jules Verne is a medical facility offering a wide range of specialties with a focus on quality and personalized care in a modern environment | Hospitals and Health Care | 🇫🇷 Nantes | 452 |  |
| 70 | [SOME](https://www.tamtam.ai/c/some) (some.fr)<br>A subsidiary offering sales and rental of construction equipment, distributing top brands with 4 locations and 40 years of experience in the industry | Wholesale Machinery | 🇫🇷 Saint-Herblain | 440 |  |
| 71 | [VYV 3 Pays de la Loire](https://www.tamtam.ai/c/vyv-3-pays-de-la-loire) (pdl.vyv3.fr)<br>A non-profit mutualist organization in Pays de la Loire region managing healthcare services for all ages, focusing on quality, affordability, and accessibility | Hospitals and Health Care | 🇫🇷 Nantes | 434 | 2019 |
| 72 | [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 |
| 73 | [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 |
| 74 | [ALCATEL SUBMARINE NETWORKS MARINE](https://www.tamtam.ai/c/alcatel-submarine-networks-marine)<br>Specializing in submarine network infrastructure, this consulting company is based in Îledefrance, France and provides management services for telecommunications projects | Business Consulting and Services | 🇫🇷 Nozay | 427 |  |
| 75 | [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 |
| 76 | [Germe, le réseau de progrès des managers](https://www.tamtam.ai/c/germe-le-reseau-de-progres-des-managers) (germe.com)<br>An organization providing training in management for executive leaders and managers to foster collective intelligence and innovative organizational practices | Professional Training and Coaching | 🇫🇷 Nantes | 420 | 1998 |
| 77 | [Conservatoire National des Arts et Metiers (Pays de la Loire - France)](https://www.tamtam.ai/c/conservatoire-national-des-arts-et-metiers-pays-de-la-loire-france) (cnam-paysdelaloire.fr)<br>Provides higher education degrees and vocational diplomas through various institutes, delivering official certifications and diplomas in multiple fields. | Education | 🇫🇷 Nantes | 419 | 1794 |
| 78 | [Edeis](https://www.tamtam.ai/c/edeis) (edeis.com)<br>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 |
| 79 | [Tipiak](https://www.tamtam.ai/c/tipiak) (tipiak.fr)<br>Food processing company, specializes in grocery products, frozen ready meals, bakery, and pastry catering. Focuses on quality, people, environment. | Food and Beverage Manufacturing | 🇫🇷 Saint-Herblain | 410 | 1967 |
| 80 | [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 |
| 81 | [SAFAL](https://www.tamtam.ai/c/safal) (safal.fr)<br>Organizes maritime transport for all cargo types. Provides comprehensive ocean freight solutions for various logistics needs, connecting global trade routes. | Truck Transportation | 🇫🇷 Saint-Aignan-Grandlieu | 403 |  |
| 82 | [Réseau GRETA-CFA des Pays de la Loire](https://www.tamtam.ai/c/reseau-greta-cfa-des-pays-de-la-loire) (greta-cfa-paysdelaloire.fr)<br>Group of public educational institutions pooling resources to offer adult continuing education tailored to local economic needs and equipment. | Professional Training and Coaching | 🇫🇷 Nantes | 394 |  |
| 83 | [Anvolia](https://www.tamtam.ai/c/anvolia) (anvolia.com)<br>Designs, installs, and maintains heating, air conditioning, and air treatment systems, managing energy for buildings across their entire lifecycle. | Construction | 🇫🇷 La Chapelle-sur-Erdre | 392 | 1991 |
| 84 | [FC Nantes](https://www.tamtam.ai/c/fc-nantes) (fcnantes.com)<br>Professional football club with multiple French championships and cups, hosting matches at Stade de la Beaujoire with VIP services. | Spectator Sports | 🇫🇷 La Chapelle-sur-Erdre | 388 | 1943 |
| 85 | [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 |
| 86 | [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 |
| 87 | [SCA Ouest E.Leclerc](https://www.tamtam.ai/c/sca-ouest-e-leclerc) (scaouest.fr)<br>The company in charge of purchasing, storage, delivery, and administrative functions for 49 stores in Western France | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Saint-Étienne-de-Montluc | 372 | 1969 |
| 88 | [CMA Pays de la Loire](https://www.tamtam.ai/c/cma-pays-de-la-loire) (artisanatpaysdelaloire.fr)<br>Represents, defends, and advises 92,360 establishments, supporting economic and social development, with a focus on training future craftspeople. | Government Administration | 🇫🇷 Sainte-Luce-Sur-Loire | 357 | 2015 |
| 89 | [Accoord](https://www.tamtam.ai/c/accoord) (accoord.fr)<br>A well-established association in Nantes offering cultural and recreational activities for families, focusing on education, social values, and community engagement | Civic and Social Organizations | 🇫🇷 Nantes | 352 | 1985 |
| 90 | [Groupe Pilote](https://www.tamtam.ai/c/groupe-pilote) (groupe-pilote.com)<br>Manufacturer of leisure vehicles since 1962, developing 7 high-tech brands for travel and freedom, catering to diverse customer needs in France and internationally. | Motor Vehicle Manufacturing | 🇫🇷 La Limouzinière | 348 | 1962 |
| 91 | [FMGC](https://www.tamtam.ai/c/fmgc) (farinia.com)<br>Manufacture gray iron cast counterweights and ballast solutions for marine renewable energy, material handling, agriculture, and off-highway sectors. | Industrial Machinery Manufacturing | 🇫🇷 Soudan | 345 |  |
| 92 | [TECHNA](https://www.tamtam.ai/c/techna) (groupe-techna.com)<br>Independent international group, expert in precision nutrition, breeding techniques, and natural health, serving agricultural production for 60 years. | Farming | 🇫🇷 Couëron | 343 | 1964 |
| 93 | [BTP CFA Pays de la Loire](https://www.tamtam.ai/c/btp-cfa-pays-de-la-loire) (btpcfa-pdl.com)<br>A leading training organization in the building trades in Pays de la Loire, training over 5000 apprentices and continuing education students on 5 sites | Construction | 🇫🇷 Nantes | 343 | 2012 |
| 94 | [AJP Immobilier France](https://www.tamtam.ai/c/ajp-immobilier-france) (ajp-immobilier.com)<br>Independent real estate agency group offering urban property services including sales, rentals, management, legal support, and new construction across multiple French regions. | Real Estate | 🇫🇷 Nantes | 343 | 1998 |
| 95 | [Urssaf Pays de la Loire](https://www.tamtam.ai/c/urssaf-pays-de-la-loire) (urssaf.fr)<br>A company specializing in collecting social security contributions and family allowances on behalf of the government | Government Administration | 🇫🇷 Nantes | 342 |  |
| 96 | [Je Bosse en Grande Distribution](https://www.tamtam.ai/c/je-bosse-en-grande-distribution) (jebosseengrandedistribution.fr)<br>Leading online platform and network for mass retail sector professionals focused on sharing industry insights, career opportunities, and community engagement initiatives. | Online Audio and Video Media | 🇫🇷 Nantes | 340 | 2011 |
| 97 | [FRANCE SECURITE](https://www.tamtam.ai/c/france-securite) (france-securite.fr)<br>Specialist distributor of personal protective equipment with innovative services, supporting risk prevention and regulatory compliance across various French sectors. | Wholesale | 🇫🇷 Saint-Herblain | 337 | 1981 |
| 98 | [ARMOR-IIMAK](https://www.tamtam.ai/c/armor-iimak) (armor-iimak.com)<br>A leading provider of thermal transfer ribbons, offering a comprehensive range of high-quality products and customer-focused solutions worldwide #thermaltransferribbons | Chemical Manufacturing | 🇫🇷 Nantes | 336 |  |
| 99 | [Eurofins Analyses Alimentaires France](https://www.tamtam.ai/c/eurofins-analyses-alimentaires-france) (eurofins.fr)<br>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 |
| 100 | [Assurance Maladie de Loire-Atlantique (CPAM)](https://www.tamtam.ai/c/assurance-maladie-de-loire-atlantique-cpam) (cpam44.fr)<br>The company supports over 1 million individuals with healthcare expenses, wellbeing preservation, care coordination, and enhanced protection in difficult situations | Government Administration | 🇫🇷 Nantes | 332 |  |

## 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.

## More company lists in the Loire-Atlantique department

- [Companies with in-house R&D in the Loire-Atlantique department](https://www.tamtam.ai/l/r-and-d-companies-loire-atlantique) (207)
- [Retail chains in the Loire-Atlantique department](https://www.tamtam.ai/l/retail-chains-loire-atlantique) (163)
- [Multinational companies in the Loire-Atlantique department](https://www.tamtam.ai/l/multinational-companies-loire-atlantique) (159)
- [Professional services firms in the Loire-Atlantique department](https://www.tamtam.ai/l/professional-services-firms-loire-atlantique) (158)
- [Software Development companies in the Loire-Atlantique department](https://www.tamtam.ai/l/software-development-companies-loire-atlantique) (137)
- [SaaS companies in the Loire-Atlantique department](https://www.tamtam.ai/l/saas-companies-loire-atlantique) (135)
- [IT services companies in the Loire-Atlantique department](https://www.tamtam.ai/l/it-services-companies-loire-atlantique) (130)
- [Manufacturers in the Loire-Atlantique department](https://www.tamtam.ai/l/manufacturers-loire-atlantique) (125)
- [IT Services and IT Consulting companies in the Loire-Atlantique department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-loire-atlantique) (110)
- [Consulting firms in the Loire-Atlantique department](https://www.tamtam.ai/l/consulting-firms-loire-atlantique) (94)
- [Distributors and wholesalers in the Loire-Atlantique department](https://www.tamtam.ai/l/distributors-and-wholesalers-loire-atlantique) (94)
- [Hardware manufacturers in the Loire-Atlantique department](https://www.tamtam.ai/l/hardware-companies-loire-atlantique) (86)
- [Business Consulting and Services companies in the Loire-Atlantique department](https://www.tamtam.ai/l/business-consulting-and-services-companies-loire-atlantique) (83)
- [Public sector organisations in the Loire-Atlantique department](https://www.tamtam.ai/l/public-sector-organisations-loire-atlantique) (82)
- [Family-owned companies in the Loire-Atlantique department](https://www.tamtam.ai/l/family-owned-companies-loire-atlantique) (71)
- [Education providers in the Loire-Atlantique department](https://www.tamtam.ai/l/education-companies-loire-atlantique) (68)
- [Real Estate companies in the Loire-Atlantique department](https://www.tamtam.ai/l/real-estate-companies-loire-atlantique) (67)
- [Financial services firms in the Loire-Atlantique department](https://www.tamtam.ai/l/financial-services-firms-loire-atlantique) (65)
- [Law Practice companies in the Loire-Atlantique department](https://www.tamtam.ai/l/law-practice-companies-loire-atlantique) (62)
- [Retail companies in the Loire-Atlantique department](https://www.tamtam.ai/l/retail-companies-loire-atlantique) (61)
- [Subscription businesses in the Loire-Atlantique department](https://www.tamtam.ai/l/subscription-businesses-loire-atlantique) (61)
- [Critical infrastructure operators in the Loire-Atlantique department](https://www.tamtam.ai/l/critical-infrastructure-operators-loire-atlantique) (59)
- [Events Services companies in the Loire-Atlantique department](https://www.tamtam.ai/l/events-services-companies-loire-atlantique) (58)
- [Construction companies in the Loire-Atlantique department](https://www.tamtam.ai/l/construction-companies-loire-atlantique) (57)

## The same list elsewhere in France

- [The largest companies in France](https://www.tamtam.ai/l/largest-companies-france) (90,813)
- [The largest companies in Île-de-France](https://www.tamtam.ai/l/largest-companies-ile-de-france) (36,143)
- [The largest companies in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/largest-companies-auvergne-rhone-alpes) (11,033)
- [The largest companies in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/largest-companies-provence-alpes-cote-dazur) (6,699)
- [The largest companies in Occitanie](https://www.tamtam.ai/l/largest-companies-occitanie) (5,769)
- [The largest companies in Grand Est](https://www.tamtam.ai/l/largest-companies-grand-est) (5,700)
- [The largest companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/largest-companies-nouvelle-aquitaine) (5,460)
- [The largest companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/largest-companies-hauts-de-seine) (5,160)
- [The largest companies in the Rhône department](https://www.tamtam.ai/l/largest-companies-rhone) (4,813)
- [The largest companies in Hauts-de-France](https://www.tamtam.ai/l/largest-companies-hauts-de-france) (4,505)
- [The largest companies in Pays de la Loire](https://www.tamtam.ai/l/largest-companies-pays-de-la-loire) (4,269)
- [The largest companies in the Bouches-du-Rhône department](https://www.tamtam.ai/l/largest-companies-bouches-du-rhone) (3,318)
- [The largest companies in Brittany](https://www.tamtam.ai/l/largest-companies-brittany) (3,058)
- [The largest companies in the Nord department](https://www.tamtam.ai/l/largest-companies-nord) (2,806)
- [The largest companies in the Gironde department](https://www.tamtam.ai/l/largest-companies-gironde) (2,435)
- [The largest companies in the Haute-Garonne department](https://www.tamtam.ai/l/largest-companies-haute-garonne) (2,406)
- [The largest companies in Normandy](https://www.tamtam.ai/l/largest-companies-normandy) (2,380)
- [The largest companies in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/largest-companies-bourgogne-franche-comte) (1,867)
- [The largest companies in Centre-Val de Loire](https://www.tamtam.ai/l/largest-companies-centre-val-de-loire) (1,701)
- [The largest companies in the Alpes-Maritimes department](https://www.tamtam.ai/l/largest-companies-alpes-maritimes) (1,538)
- [The largest companies in Paris](https://www.tamtam.ai/l/largest-companies-paris) (22,790)
- [The largest companies in Lyon](https://www.tamtam.ai/l/largest-companies-lyon) (2,679)
- [The largest companies in Toulouse](https://www.tamtam.ai/l/largest-companies-toulouse) (1,565)
- [The largest companies in Marseille](https://www.tamtam.ai/l/largest-companies-marseille) (1,534)

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