These are the largest companies in the French department of Seine-Maritime, predominantly large organizations. The list features a mix of industries, including manufacturing, finance, education, and public services. Noteworthy examples include Sidel, a packaging equipment provider; Matmut, an insurance group; CHU de Rouen, a major hospital network; and Crédit Agricole Normandie-Seine, a regional bank.
A significant portion of these large employers are public or quasi-public institutions, such as CHU de Rouen, Université de Rouen, and DEPARTEMENT DE LA SEINE-MARITIME. The presence of multiple higher education institutions like Université de Rouen and EM Normandie Business School, alongside major public service providers, indicates a strong public sector employment base in the region.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 6,370 | ||||
| 2 | 4,244 | ||||
| 3 |
CHU de Rouenchu-rouen.fr
Large hospital network providing patient care, medical education, and research, supporting regional healthcare and training future health professionals. |
3,823 | |||
| 4 |
Université de Rouenuniv-rouen.fr
Offers education in law, economics, management, humanities, health, sports, sciences, and technology disciplines. |
3,200 | |||
| 5 |
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 | |||
| 6 |
DEPARTEMENT DE LA SEINE-MARITIMEseinemaritime.fr
Provides essential social services, manages departmental roads, supports local communities, and promotes education, culture, economic development, and tourism in the region. |
1,450 | |||
| 7 |
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 | |||
| 8 |
EM Normandie Business Schoolem-normandie.com
Established in 1871, this institution is a leading French business school accredited by AMBA, AACSB, and EQUIS It offers management education to students and professionals worldwide |
1,196 | |||
| 9 |
Université Le Havre Normandieuniv-lehavre.fr
Educates seven thousand students through specialized departments in international affairs, logistics, engineering, humanities, and sciences focused on human and professional development. |
1,042 | |||
| 10 |
FOURE LAGADECfourelagadec.com
FOURE LAGADEC offers complete service solutions for industries, specializing in boiler production and industrial maintenance with a focus on quality, safety, and the environment |
1,003 | |||
| 11 |
Ville du Havrelinktr.ee
local government managing urban planning, environment, port activities, culture, history, tourism, economy, education, sports, and public events |
902 | |||
| 12 |
Groupe Hospitalier du Havre - GHHch-havre.fr
Leading healthcare provider, comprehensive care, advanced medical technology, collaboration with other hospitals, diverse medical professions, round-the-clock technical platform. |
893 | |||
| 13 |
HAROPA PORTharopaport.com
Manages a major French river-maritime port network, connecting international shipping with a vast hinterland, handling significant maritime and river traffic. |
892 | |||
| 14 |
LASSARATlassarat.com
A long-standing group specializing in surface treatment and industrial coatings, focused on innovation and customer satisfaction in various sectors worldwide |
888 | |||
| 15 |
Métropole Rouen Normandiemetropole-rouen-normandie.fr
Manages 71 communes, providing essential services like water, transport, waste, promoting local development, tourism, and actively addressing climate change. |
886 | |||
| 16 |
SEAFRIGOseafrigo.com
Global food logistics specialist, managing temperature-controlled supply chains for food, wine, spirits, frozen, fresh products, and general cargo. |
856 | |||
| 17 |
CERP ROUENastera.coop
pharmacy cooperative providing distribution services, technological innovation integration, and reliable, high-quality support for pharmacists' development and needs |
745 | |||
| 18 | 727 | ||||
| 19 | 717 | ||||
| 20 |
District scolaire francophone Sudfrancophonesud.nbed.nb.ca
A French school district in New Brunswick with over 17,000 students in 38 schools, focusing on academic success, Acadian identity, and overall well-being of students and staff |
662 | |||
| 21 |
SDIS 76 - Sapeurs-pompiers de la Seine-Maritimesdis76.fr
Departmental organization managing emergency services, including fire fighting, victim rescue, risk prevention, and specialized interventions in hazardous environments. |
657 | |||
| 22 | 648 | ||||
| 23 |
Espace Culturel E.Leclerce.leclerc
This company operates cultural spaces that offer a variety of products and services to customers |
631 | |||
| 24 |
Groupe LHOTELLIERlhotellier.fr
A century-old independent family group specializing in construction, public works, and environmental services, with a strong focus on local development and sustainability |
608 | |||
| 25 |
Ville de Rouenrouen.fr
Leading urban center in Normandy, Rouen offers a vibrant cultural scene and diverse activities Committed to quality of life, innovation and community engagement |
597 | |||
| 26 |
Helvetia Insurance Francehelvetia.com
Specializes in enterprise risk, marine, and transport insurance for various sectors including construction, automotive fleets, art, and international programs. |
588 | |||
| 27 |
Carsat Normandiecarsat-normandie.fr
Provides retirement, social action, and occupational health services. Manages substantial retirement payments, social support, and workplace prevention across the region. |
552 | |||
| 28 |
Le Havre Seine Métropolelehavreseinemetropole.fr
This Metropolis aims for excellence through innovation in economy, society, and environment. It focuses on green and blue economy, higher education, and tourism, serving its 275,000 inhabitants. |
527 | |||
| 29 |
Ceacomnormandie.ceacom.fr
A customer relationship management company based in Le Havre, offering advisory and service jobs, actively involved in professional insertion networks and local events |
521 | |||
| 30 |
INSA Rouen Normandieinsa-rouen.fr
Leading engineering institution providing 9 engineering programs, conducting research across 9 laboratories, and promoting scientific culture, focusing on risk management. |
511 | |||
| 31 |
Saipolsaipol.com
A French agri-food company specializing in processing oilseeds into oils, animal feed, renewable transport fuels, and vegetable glycerin |
493 | |||
| 32 |
Habitat 76habitat76.fr
Manages over 28,000 social housing units across 190 municipalities, focusing on access, maintenance, and eco-efficient solutions for sustainable living. |
469 | |||
| 33 |
Education et Formationeducationetformation.fr
Leading association in developing basic and professional training, combatting illiteracy, and promoting inclusion in society |
461 | |||
| 34 |
Cerfrance Seine Normandieseine-normandie.cerfrance.fr
With 29 agencies in Normandy and part of Île-de-France, Cerfrance Seine Normandie supports businesses with long-term success through project management and performance monitoring Explore job opportunities |
461 | |||
| 35 |
Fondation Les Nidslesnids.fr
A reputable foundation in Normandy provides protection, support, education, and understanding to children and adolescents in need through various social services |
446 | |||
| 36 |
Junior Seniorjuniorsenior.fr
Junior Senior is a network of approved home care services providing various services like cleaning, gardening, childcare, and support for dependency and disability |
427 | |||
| 37 |
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 | |||
| 38 |
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 | |||
| 39 |
Novacelnovacel-solutions.com
Provides technical films, tapes, papers, and machines to protect and preserve material surfaces across various industrial market segments. |
390 | |||
| 40 |
UbiPharm Groupubipharm.com
UbiPharm enhances access to healthcare solutions in over 15 African countries by integrating key supply chain services with innovative distribution strategies |
386 | |||
| 41 |
ENSM, École Nationale Supérieure Maritimesupmaritime.fr
Educates Merchant Navy Officers and Marine Engineers, covering navigation, maritime operations, and safety, with practical experience through internships and partnerships. |
381 | |||
| 42 |
Aspen Notre-Dame-de-Bondevilleaspenndb.com
Manufacturing sterile pharmaceutical products, including antithrombotics and injectable anesthetics, from active ingredient to finished product, with global distribution and ethical practices. |
377 | |||
| 43 |
PGS GROUPpgsgroup.com
Development and supply of customized wooden packaging solutions, including pallets and eco-friendly services, focused on cost-saving and sustainability. |
354 | |||
| 44 | 353 | ||||
| 45 |
Interior'sinteriors.fr
A French-based company specializing in unique furniture and accessories, handcrafted with traditional methods and exceptional quality wood, reflecting French 'Art de vivre' |
347 | |||
| 46 |
ESIGELEC : ÉCOLE D'INGÉNIEURS-ES GÉNÉRALISTESesigelec.fr
Specializing in general engineering education, the company offers various programs in Intelligent and Connected Systems, emphasizing project-based learning, internships, entrepreneurship, and innovation for over 10,000 graduates |
341 | |||
| 47 | 340 | ||||
| 48 |
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 | |||
| 49 |
Alpha Maintenancealpha.fr
Company specializing in oil and energy sector, providing services and solutions based in Port-de-Bouc, France. |
333 | |||
| 50 | 314 | ||||
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. | |||||
| 51 |
Groupe SOGESTRANsogestran.com
Inland waterway and maritime shipowner offering environmentally friendly transport for oil, chemicals, dry bulk, general goods, with focus on quality and safety |
303 | |||
| 52 |
Centre hospitalier intercommunal Elbeuf Louviers Val de Reuilchi-elbeuf-louviers.fr
Public healthcare facility in Normandy with 1083 beds, 2143 staff including 267 medical personnel, two hospital sites, maternity, and five nursing homes. |
291 | |||
| 53 |
Greta Rouen Maritimegreta.ac-normandie.fr
A company providing a wide range of vocational training programs through a network of 250 centers, offering over 280 courses to 2000+ individuals annually |
286 | |||
| 54 |
LVO Grouplv-overseas.fr
Global logistics provider with presence in France, French overseas territories, Asia, Africa, Middle East, and US, offering flexible transport solutions worldwide |
281 | |||
| 55 |
Transdev Rouen (TCAR)transdev.com
Providing safe, efficient, and innovative mobility solutions for residents of the Rouen Normandy Metropolis to navigate the area |
274 | |||
| 56 |
Clinique Saint Hilaireclinique-sainthilaire.fr
Medical surgical facility with 223 beds, 380 staff, 75 practitioners, offering innovative care across surgical, cardiovascular, and oncology specialties. |
265 | |||
| 57 |
Atlas sécurité Privéeatlas-securite.fr
Specializes in providing security services across various sectors including public, events, retail, industry, nuclear, port, logistics, and tertiary. |
248 | |||
| 58 |
Logeo Seinelogeo.fr
Social housing company providing innovative residential solutions, enhanced customer service, and sustainable development for Normandy and Axe Seine territories. |
247 | |||
| 59 |
GROUPE SEALOGISgeodis.com
Provides tailored maritime, inland, and air transport solutions with extensive European coverage and dedicated teams ensuring secure door-to-door delivery. |
247 | |||
| 60 |
Groupe Nutrisetgroupenutriset.fr
Research, production, and distribution of nutritional products to treat and prevent malnutrition among vulnerable populations worldwide. |
246 | |||
| 61 |
Transdev Normandietransdev.com
Providing sustainable, innovative, and secure mobility solutions for communities, Transdev Normandie collaborates with local authorities and businesses to optimize transportation services |
243 | |||
| 62 |
AVENEL SASavenel.fr
A family-owned company founded in 1944 offering services in construction, industrial expertise, infrastructure projects, energy, and maintenance solutions |
242 | |||
| 63 |
Réseau Alliance Francerecrutement.reseaualliance.fr
The Alliance Network is a global HR solutions provider, supporting individuals throughout their careers by establishing trust with international companies in various industries |
238 | |||
| 64 |
Notaire Test
The company provides a range of services and solutions, with a focus on innovation and customer satisfaction |
236 | |||
| 65 | 227 | ||||
| 66 |
UGECAM NORMANDIEgroupe-ugecam.fr
A non-profit group in France providing healthcare and support services for people with physical and intellectual disabilities, with a focus on equality and quality care |
224 | |||
| 67 |
VYV 3 Normandienormandie.vyv3.fr
Provides extensive medical and paramedical care, social support services, and community health programs across Normandy for diverse populations. |
222 | |||
| 68 |
Caux Seine agglocauxseine.fr
Caux Seine agglo is an intermunicipal cooperation organization uniting 50 municipalities and 77,777 residents, promoting economic and social development in the region |
212 | |||
| 69 |
HOPITAL PRIVE DE L'ESTUAIREhopital-prive-de-l-estuaire-le-havre.ramsaysante.fr
A healthcare facility in Le Havre, part of Ramsay Santé group, providing comprehensive inpatient and outpatient services with a focus on high-quality patient care |
212 | |||
| 70 |
Les Ateliers du Goûtles-ateliers-du-gout.fr
Production of homemade-style French recipes for professional restaurateurs, emphasizing quality, teamwork, and regional manufacturing workshops. |
212 | |||
| 71 |
IVT Securitybarkene.fr
Design, installation, and maintenance of fire detection, intrusion alarms, video surveillance, access control, safes, and armored partitions for professional clients nationwide. |
211 | |||
| 72 |
Pressalitpressalit.com
A Danish company producing high-quality toilet seats, accessible bathrooms, and height-adjustable kitchens for people with reduced mobility since 1954 |
211 | |||
| 73 |
Havre Athletic Clubhac-foot.com
French football club competing in Ligue 1, renowned for youth training, community engagement, stadium management, and business networking. |
210 | |||
| 74 | 210 | ||||
| 75 |
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 | |||
| 76 |
Ville de Sotteville-lès-Rouensotteville-les-rouen.fr
Local government promoting environmental sustainability, community participation, economic development, and quality of life through active urban planning and social initiatives. |
206 | |||
| 77 |
Paris Normandieparis-normandie.fr
Daily newspaper providing local news, sports, photos, and videos primarily in Haute-Normandie, serving as a regional media reference. |
206 | |||
| 78 |
SI2Pcentre-formation-securite.fr
Si2p is a national training organization specializing in assisting businesses with workplace safety, offering fire safety and health at work training, audits, and equipment maintenance services |
202 | |||
| 79 |
Nexiranexira.com
Family-owned company, world leader acacia gum, global leader natural ingredients, botanical extracts, food, nutrition, dietary supplements, clean label. |
200 | |||
| 80 |
Alcéanealceane.fr
Manage over 15,000 social housing units across 17 municipalities, housing 32,000 tenants, focusing on construction, rehabilitation, and social cohesion. |
200 | |||
| 81 |
Abysse Corp Groupabyssecorp.com
Design, manufacture, and distribute licensed pop culture merchandise including manga, cinema, video games, with global offices and multiple product lines. |
192 | |||
| 82 |
SIEMOsiemo-france.com
A family-owned company specializing in insulation, scaffolding, and fireproofing for industrial sites, focusing on safety, environment, and client satisfaction |
191 | |||
| 83 |
Sogea Nord-Ouestfrance.vinci-construction.com
A major construction player in Normandy, offering a wide range of building services from design to maintenance, tailored solutions for functional, residential, and industrial projects |
191 | |||
| 84 |
SOCAPSsocaps.coop
Global leader in technical assistance and consulting services for various industries worldwide, focusing on skills development, ecological transition, and societal innovations |
189 | |||
| 85 |
Bulle de Lingebulledelinge.com
Specializing in laundry services for residents, providing quality clothing care for over 60,000 individuals in 800 facilities, promoting well-being for dependent individuals |
186 | |||
| 86 |
CLINIQUE DU CEDREclinique-du-cedre.fr
A hospital and health care company located in Bois Guillaume, France, specializing in providing medical services to patients |
184 | |||
| 87 |
Aris Servicesaris-services.com
Specializes in thermal insulation, scaffolding, and asbestos removal with extensive experience serving maritime, nuclear, and industrial sectors across France. |
183 | |||
| 88 |
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 | |||
| 89 |
Segafredo Zanetti France S.A.S.segafredo.fr
Specializes in coffee roasting, packaging, and marketing, focusing on product quality, customer satisfaction, innovation, and corporate social responsibility. |
180 | |||
| 90 |
SLAUR SARDETslaur.com
A leading French manufacturer of alcoholic beverages, syrups, and private label products, known for excellence, innovation, and global export |
180 | |||
| 91 |
Préfecture de la région Normandie et de la Seine-Maritimeseine-maritime.gouv.fr
Official account providing government services and information for the Normandy region and Seine-Maritime department, including social media moderation guidelines. |
180 | |||
| 92 |
Bâtiment CFA Normandiebatimentcfanormandie.fr
The company offers diverse training in the construction industry, emphasizing energy and digital transitions, apprenticeships, and the opportunity for young individuals to explore various trades before specializing |
174 | |||
| 93 |
Matmut Protection Juridiquematmut.fr
Offering Legal Protection guarantees for individuals and professionals as a subsidiary of the Matmut Group Stay updated on the Group and its subsidiaries on their LinkedIn page! |
173 | |||
| 94 |
AE Partneraepartner.dk
Specializing in designing and producing complex automation systems and electrical panels, offering consultations, custom designs, and a focus on quality and customer satisfaction |
172 | |||
| 95 |
Ligue Havraise, pour l'aide aux personnes handicapéesliguehavraise.fr
A non-profit association founded in 1958, supporting individuals with intellectual, psychiatric, autism, or multiple disabilities to defend their interests and rights |
172 | |||
| 96 | 172 | ||||
| 97 | 171 | ||||
| 98 |
IUT de Roueniutrouen.univ-rouen.fr
The company offers a variety of technical and professional training programs at the university level, focusing on specialized fields and emphasizing practical skills for quick professional integration |
168 | |||
| 99 | 167 | ||||
| 100 |
NORMANDIE MANUTENTIONnormandiemanutention.fr
Supplier of business supplies and equipment based in Upper Normandy, providing essential tools and materials for various industries. |
166 | |||
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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 11, 2026.
More company lists in the Seine-Maritime department
- Retail chains in the Seine-Maritime department 97
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- Public sector organisations in the Seine-Maritime department 65
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- 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
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- Software Development companies in the Seine-Maritime department 28
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- 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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