These are the largest companies in Seine-Maritime, primarily mid-sized firms. The list features a mix of sectors, with a notable presence of financial services, retail, and agriculture. Matmut, an insurance provider, and Crédit Agricole Normandie-Seine, a regional bank, are prominent financial entities. Espace Culturel E.Leclerc operates cultural retail spaces, while NATUP is an agricultural cooperative. Mon Véto is a network of veterinary clinics, and PAUL MARIUS specializes in retro-inspired leather goods.
A significant pattern observed is the concentration of headquarters in and around Rouen and Bois-Guillaume. Many companies on this list were founded in the latter half of the 20th century or early 21st century, indicating a blend of established and relatively newer enterprises within the department.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 4,244 | ||||
| 2 |
Crédit Agricole Normandie-Seineca-normandie-seine.fr
Regional bank with 130 branches and online services for individuals, professionals, farmers, businesses, and public communities in Eure and Seine-Maritime. |
1,566 | |||
| 3 |
Caisse d'Epargne Normandiecaisse-epargne.fr
Regional bank serving individuals, professionals, businesses, and local authorities with tailored financial advice and community project support in Normandy. |
1,402 | |||
| 4 |
Espace Culturel E.Leclerce.leclerc
This company operates cultural spaces that offer a variety of products and services to customers |
631 | |||
| 5 |
NATUPnatup.coop
This agricultural and agri-food cooperative supports 7000 farmers, focusing on sustainable agriculture, processing, and distributing raw or transformed products across a wide territory. |
426 | |||
| 6 |
OXYPHARMvitadomia.com
Oxypharm offers personalized medical technology solutions through collaboration with pharmacists, specializing in home medical equipment, respiratory care, infusion/nutrition/diabetes, and disability support |
425 | |||
| 7 |
Mon Vétoveterinaire-monveto.com
Established in 2010 by veterinarians, this network of general veterinary clinics has expanded across various regions in France, boasting over 250 clinics and nearly 1900 veterinary professionals |
335 | |||
| 8 |
VYV 3 Normandienormandie.vyv3.fr
Provides extensive medical and paramedical care, social support services, and community health programs across Normandy for diverse populations. |
222 | |||
| 9 |
Havre Athletic Clubhac-foot.com
French football club competing in Ligue 1, renowned for youth training, community engagement, stadium management, and business networking. |
210 | |||
| 10 |
COIFF'IDISlinktr.ee
A leading provider of professional hairdressing and beauty products in France, founded in 1998, with a dedicated team of 245 employees supporting the industry |
208 | |||
| 11 |
Nachos Mexican Good Foodnachos.fr
Fast-casual Mexican restaurants, fresh, tasty, and healthy food prepared on-site. Expanding through franchising across France, offering a recognized franchise network. |
182 | |||
| 12 |
NORMANDIE MANUTENTIONnormandiemanutention.fr
Supplier of business supplies and equipment based in Upper Normandy, providing essential tools and materials for various industries. |
166 | |||
| 13 | 149 | ||||
| 14 |
PAUL MARIUSpaulmarius.fr
The company specializes in creating handmade retro-inspired leather bags and accessories, with a focus on quality craftsmanship and affordable prices |
145 | |||
| 15 |
LEPICARD AGRICULTURElepicard.fr
Family business, over 150 years, assists farmers daily with farm management, operating 64 sites for deposits and collections, serving 2,500 clients. |
135 | |||
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| 16 |
REGIS LOCregisloc.fr
Specializing in equipment rental since 1976, offering a wide range of tools for construction, landscaping, and DIY projects across 50 locations in France |
131 | |||
| 17 |
Plein Cielpleinciel.fr
Established in 1956, this French company is a leading distributor of office supplies, stationery, technology, furniture, and general services with 180 locations nationwide |
127 | |||
| 18 |
Lechevaliergroupe-lechevalier.com
Specialized in industrial maintenance products distribution for over 70 years, offering a wide range of leading brand products through 17 sales points and 2 logistics centers |
124 | |||
| 19 |
Niort Frères Distribution | Nos Actualitésniortfreres.fr
Specializes in automotive and heavy-duty vehicle parts, tools, consumables, and repair services in Seine-Maritime and Eure regions. |
113 | |||
| 20 |
Hyper U Le Grand Quevillymagasins-u.com
Established in 1976, this store, now operating as Hyper U since 2009, offers a wide range of local products and in-house made items With over 300 employees and 12,000 m2 in size, they pride themselves on showcasing their skills |
111 | |||
| 21 |
L'Atelier 5latelier5.fr
A custom suits and clothing brand with 11 boutiques across France, looking to expand to major cities in Europe Offers rewarding careers with freedom |
110 | |||
| 22 |
La Halle aux Chaussures
Development and provision of computer software solutions, focusing on creating and distributing software products from Dieppe, France. |
95 | |||
| 23 |
Le Cèdre Hospitality
An upscale hospitality & restaurant group in Normandy, managing 5 establishments with Michelin-starred dining, bistros, Mediterranean cuisine, and a charitable foundation |
85 | |||
| 24 |
Pasino Le Havre - Groupe Partouchecasino-lehavre.partouche.com
A popular entertainment venue offering casino games, dining, a 4-star hotel with elegant rooms, event spaces, and a 630-seat theater |
73 | |||
| 25 |
Le Domaine de Forges Groupe Partouchedomaine-de-forges.partouche.com
Located in Normandy, 110km from Paris, this leisure concept offers a casino, restaurants, hotels, golf course, and spa for unforgettable events and relaxation experiences |
70 | |||
| 26 |
BURO+buroplus.com
A leading office supplies and furniture provider offering competitive prices, quality logistics, and fast delivery to help businesses simplify their daily operations |
68 | |||
| 27 |
Groupe Hecquet
Distributes several car brands like Audi, Skoda, KIA, Lamborghini. Operates used car sales centers and provides fleet management for professionals. Also, bodywork and paint services. |
63 | |||
| 28 |
MARTENAT NORMANDIEmartenat.fr
Specializing in distributing IVECO, FIAT PROFESSIONAL, and PIAGGIO commercial vehicles, offering sales, leasing, maintenance, bodywork, painting, and after-sales services in multiple locations |
62 | |||
| 29 |
Hyper U Franqueville-Saint-Pierremagasins-u.com
Innovative local convenience store in Franqueville-Saint-Pierre with a professional team dedicated to customer service |
59 | |||
| 30 |
Stellantis &You Normandiestellantisandyou.com
Buy, sell, rent, and maintain Peugeot, Citroën, DS Automobiles vehicles |
57 | |||
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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 11, 2026.
More company lists in the Seine-Maritime department
- The largest companies in the Seine-Maritime department 918
- Multinational companies in the Seine-Maritime department 89
- Manufacturers in the Seine-Maritime department 72
- Companies with in-house R&D in the Seine-Maritime department 67
- Public sector organisations in the Seine-Maritime department 65
- Distributors and wholesalers in the Seine-Maritime department 53
- Professional services firms in the Seine-Maritime department 51
- Critical infrastructure operators in the Seine-Maritime department 46
- Family-owned companies in the Seine-Maritime department 44
- IT services companies in the Seine-Maritime department 40
- Hardware manufacturers in the Seine-Maritime department 38
- Education providers in the Seine-Maritime department 36
- Healthcare providers in the Seine-Maritime department 34
- Logistics companies in the Seine-Maritime department 34
- Financial services firms in the Seine-Maritime department 32
- IT Services and IT Consulting companies in the Seine-Maritime department 30
- Real Estate companies in the Seine-Maritime department 30
- Higher Education companies in the Seine-Maritime department 28
- Software Development companies in the Seine-Maritime department 28
- Government Administration companies in the Seine-Maritime department 27
- Industrial Machinery Manufacturing companies in the Seine-Maritime department 27
- Consulting firms in the Seine-Maritime department 26
- Hospitals and Health Care companies in the Seine-Maritime department 25
The same list elsewhere in France
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- Retail chains in the Rhône department 302
- Retail chains in the Hauts-de-Seine department 292
- Retail chains in the Bouches-du-Rhône department 281
- Retail chains in the Nord department 268
- Retail chains in Normandy 244
- Retail chains in the Haute-Garonne department 222
- Retail chains in the Gironde department 217
- Retail chains in the Alpes-Maritimes department 164
- Retail chains in Centre-Val de Loire 164
- Retail chains in the Loire-Atlantique department 163
- Retail chains in Bourgogne-Franche-Comté 158
- Retail chains in Paris 1,491
- Retail chains in Lyon 154
- Retail chains in Toulouse 139