The Loire-Atlantique department hosts a diverse range of manufacturing companies, from large industrial groups to specialized mid-sized firms. Chantiers de l'Atlantique, with 2472 employees, builds complex ships and marine installations. EURIAL, la branche Lait d'Agrial is a dairy cooperative, while LACROIX - Electronics designs and manufactures embedded electronics. Valneva is a specialty vaccine company, and NEWCLIP TECHNICS produces osteosynthesis implants.
These companies demonstrate a strong presence in advanced manufacturing and specialized industries. There is a notable cluster of companies involved in marine-related activities, including shipbuilding, marine power, and marine renewable energy solutions, alongside significant players in food processing and healthcare technology.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Chantiers de l'Atlantiquechantiers-atlantique.com
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. |
2,472 | |||
| 2 |
EURIAL, la branche Lait dAgrialeurial.eu
Leading French dairy cooperative, producing goat cheese, specialty butter, mozzarella, and a range of fresh dairy products. |
1,754 | |||
| 3 |
LACROIX - Electronicslacroix-electronics.com
Design and manufacture embedded electronics for diverse solutions, combining R&D with Industry 4.0 manufacturing in automotive, industrial, and healthcare sectors. |
1,039 | |||
| 4 |
Sercelsercel.com
Leading provider of high-standard subsurface measurement and data solutions for natural resources, infrastructure monitoring, energy transition, and defense sectors since 1956. |
942 | |||
| 5 |
Valnevavalneva.com
Specialty vaccine company developing prophylactic vaccines for infectious diseases, including travel vaccines and candidates for Lyme disease, Zika virus, and more |
666 | |||
| 6 |
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 | |||
| 7 |
NEWCLIP TECHNICSnewcliptechnics.com
Design manufacture and market innovative osteosynthesis implants for elective surgery and traumatology with focus on quality and performance. |
500 | |||
| 8 | 
ALCATEL SUBMARINE NETWORKS MARINE
Specializing in submarine network infrastructure, this consulting company is based in Îledefrance, France and provides management services for telecommunications projects |
427 | |||
| 9 | 410 | ||||
| 10 |
Groupe Pilotegroupe-pilote.com
Manufacturer of leisure vehicles since 1962, developing 7 high-tech brands for travel and freedom, catering to diverse customer needs in France and internationally. |
348 | |||
| 11 |
FMGCfarinia.com
Manufacture gray iron cast counterweights and ballast solutions for marine renewable energy, material handling, agriculture, and off-highway sectors. |
345 | |||
| 12 |
TECHNAgroupe-techna.com
Independent international group, expert in precision nutrition, breeding techniques, and natural health, serving agricultural production for 60 years. |
343 | |||
| 13 |
ARMOR-IIMAKarmor-iimak.com
A leading provider of thermal transfer ribbons, offering a comprehensive range of high-quality products and customer-focused solutions worldwide #thermaltransferribbons |
336 | |||
| 14 |
APLIX - HOOK & LOOPaplix.com
Specializes in innovative hook and loop fastening solutions for diverse industries including hygiene, automotive, aircraft, medical, packaging, and building sectors. |
309 | |||
| 15 |
MADIC groupgroupe.madic.com
innovative French industrialist in electronic payment, petroleum equipment, services, and Digital Media communication, with a focus on sustainable development values. |
267 | |||
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 | 255 | ||||
| 17 | 217 | ||||
| 18 |
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 | |||
| 19 |
Groupe Janneau Industriesgroupe-janneau.com
Craftsmen specializing in high-quality window joinery, maintaining artisanal values and meticulous care for over 50 years. |
203 | |||
| 20 | 201 | ||||
| 21 |
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 | |||
| 22 | 173 | ||||
| 23 |
TIPIAK TRAITEUR PATISSIERcarrieres.tipiak.fr
Specialist in savory and sweet cocktail and appetizer bites, including fresh or frozen canapés, petits fours, and macarons. |
172 | |||
| 24 |
WIRQUIN FRANCEwirquingroup.com
Design and manufacture water-efficient plumbing and sanitary products enhancing comfort, hygiene, and space-saving in bathrooms and kitchens. |
162 | |||
| 25 |
COFIDUR SEICOseico.fr
Expertise in electronics manufacturing providing innovative product solutions for industry, IoT, security, automotive, and energy sectors. |
142 | |||
| 26 |
HALGANDgroupe-halgand.com
An industrial group specializing in aerospace, defense, space, and rail sectors, providing global technical solutions for design, manufacturing, machining, forming, and assembly |
139 | |||
| 27 |
EUROPE TECHNOLOGIESeuropetechnologies.com
This group offers expertise in industrializing and manufacturing composite and metallic parts, designing robot cells and machines for various processes, and providing international MRO services across industries. |
116 | |||
| 28 |
Groupe Mauginmaugin.fr
Design, manufacture, and sell PVC, aluminum, and steel windows, entrance doors, and roller shutters with innovative industrial production. |
107 | |||
| 29 |
KUHN - HUARD S.A.
A machinery company in France specializing in manufacturing a variety of equipment, located in Chateaubriant |
99 | |||
| 30 |
Definox Groupdefinox.com
A leading manufacturer of stainless steel valves and equipment for food, cosmetics, pharmaceutical, and fine chemicals industries, offering customized solutions and services globally |
97 | |||
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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 the Loire-Atlantique department
- The largest companies in the Loire-Atlantique department 2,044
- Companies with in-house R&D in the Loire-Atlantique department 207
- Retail chains in the Loire-Atlantique department 162
- Multinational companies in the Loire-Atlantique department 159
- Professional services firms in the Loire-Atlantique department 158
- Software Development companies in the Loire-Atlantique department 137
- SaaS companies in the Loire-Atlantique department 135
- IT services companies in the Loire-Atlantique department 130
- IT Services and IT Consulting companies in the Loire-Atlantique department 110
- Consulting firms in the Loire-Atlantique department 94
- Distributors and wholesalers in the Loire-Atlantique department 94
- Hardware manufacturers in the Loire-Atlantique department 86
- Business Consulting and Services companies in the Loire-Atlantique department 83
- Public sector organisations in the Loire-Atlantique department 80
- Family-owned companies in the Loire-Atlantique department 71
- Education providers in the Loire-Atlantique department 68
- Real Estate companies in the Loire-Atlantique department 67
- Financial services firms in the Loire-Atlantique department 65
- Law Practice companies in the Loire-Atlantique department 62
- Retail companies in the Loire-Atlantique department 61
- Subscription businesses in the Loire-Atlantique department 61
- Critical infrastructure operators in the Loire-Atlantique department 58
- Events Services companies in the Loire-Atlantique department 58
- Construction companies in the Loire-Atlantique department 57
The same list elsewhere in France
- Manufacturers in France 6,697
- Manufacturers in Île-de-France 1,515
- Manufacturers in Auvergne-Rhône-Alpes 1,216
- Manufacturers in Grand Est 573
- Manufacturers in Nouvelle-Aquitaine 498
- Manufacturers in Pays de la Loire 484
- Manufacturers in Occitanie 433
- Manufacturers in Provence-Alpes-Côte d'Azur 394
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- Manufacturers in Brittany 307
- Manufacturers in the Hauts-de-Seine department 285
- Manufacturers in Bourgogne-Franche-Comté 272
- Manufacturers in Normandy 245
- Manufacturers in Centre-Val de Loire 207
- Manufacturers in the Nord department 204
- Manufacturers in the Bouches-du-Rhône department 187
- Manufacturers in the Isère department 178
- Manufacturers in the Haute-Garonne department 159
- Manufacturers in the Gironde department 137
- Manufacturers in the Essonne department 127
- Manufacturers in the Loire department 122
- Manufacturers in the Bas-Rhin department 118
- Manufacturers in Paris 546
The same list elsewhere
- Manufacturers in the world 39,579
- Manufacturers in Europe 18,156