| # | Company | Employees |
|---|---|---|
| 1 |
Université de Rennes Iuniv-rennes.fr
Multidisciplinary university focusing on dynamic research, lifelong learning, societal challenges, and regional socio-economic and cultural development through partnerships. |
4,002 |
| 2 |
CHU de Renneschu-rennes.fr
Large French public hospital offering extensive medical, surgical, and obstetrical services, advanced diagnostics, research, and medical training to the population. |
3,470 |
| 3 |
CHU de Brestchu-brest.fr
Leading healthcare institution in western Brittany with extensive medical, surgical, oncology, psychiatric, geriatric, pediatric, and gynecological services across multiple sites. |
2,597 |
| 4 |
Université Rennes 2univ-rennes2.fr
Higher education and research focused on arts, humanities, social sciences, languages, communication, psychology, education, sociology, geography, history, and sports. |
2,286 |
| 5 |
Rennes Ville et Métropolerennes.fr
Fosters economic, urban development, attracting talent and students. Provides diverse public services through 5300 agents, focusing on quality of life and professional growth. |
1,828 |
| 6 |
Région Bretagnebretagne.bzh
Elected assembly managing Brittany's daily life and future through education, transport, economic development, planning, culture, sports, and environment. |
1,529 |
| 7 |
EHESP - École des hautes études en santé publiqueehesp.fr
A public institution offering a wide range of training programs in public health, with a strong focus on research and international partnerships |
1,474 |
| 8 |
University of South Brittanyuniv-ubs.fr
The University of Southern Brittany is professional and innovative, offering degrees in key areas like "Sea & Coastal", "Cyber", "Materials", and "Data Science" |
1,096 |
| 9 |
Conseil départemental du Finistèrefinistere.fr
Finistère council promotes the region's quality of life, natural beauty, and economic dynamism, supporting residents through various public services across its territories. |
1,075 |
| 10 |
Brest Métropolebrest.fr
Brest métropole océane is a voluntary urban community in western Brittany, anchoring a region with 90 towns and 300,000 residents |
1,072 |
| 11 |
Département d'Ille-et-Vilaineille-et-vilaine.fr
Management of social services, education, infrastructure, environment, and culture with a focus on solidarity and regional development. |
994 |
| 12 |
IMT Atlantiqueimt-atlantique.fr
A prestigious engineering school specializing in digital, energy, and environmental transition, offering diverse programs and strong partnerships with businesses |
966 |
| 13 |
Académie de Rennesac-rennes.fr
Official regional education authority managing national education services and policies across the Brittany region including four departments. |
809 |
| 14 |
CENTRE HOSPITALIER GUILLAUME REGNIERch-guillaumeregnier.fr
Provides prevention, diagnosis, treatment, rehabilitation, social reintegration, research, and education in adult and child psychiatry sectors. |
679 |
| 15 |
Le Département des Côtes d'Armorcotesdarmor.fr
The company is a local government entity in Côtes d'Armor, France, providing social services, infrastructure, cultural events, and educational opportunities for its residents |
661 |
| 16 |
Cullettività di Corsicaisula.corsica
Ensures Corsican people's interests, implements public policies in diverse sectors, driving the island's development and managing local affairs. |
595 |
| 17 |
Département du Morbihanmorbihan.fr
Manages public services across a dynamic region, encompassing urban, rural, and coastal areas, supporting residents in daily life, family, education, and environment. |
520 |
| 18 |
SIB [numérique, santé et secteur public]sib.fr
Innovative cooperative in digital health and public sector, serving 620+ institutions in modernizing their IT systems with a wide range of services and expertise |
499 |
| 19 |
INSA Rennesinsa-rennes.nous-recrutons.fr
Provides five-year post-baccalaureate engineering education with strong research in information technologies and materials science in Brittany, France. |
483 |
| 20 |
Centre hospitalier de Cornouaille Quimper-Concarneauch-cornouaille.fr
Regional hospital network providing surgery, medicine, obstetrics, geriatrics, cancer care, rehabilitation, and coordinated patient care with advanced medical technology. |
478 |
| 21 |
GROUPE HOSPITALIER BRETAGNE SUDghbs.bzh
Public healthcare institution in South Brittany offering extensive medical care, training, research, and partnerships across multiple sites. |
478 |
| 22 |
Saint-Brieuc Armor Agglomérationsaintbrieuc-armor-agglo.bzh
In the heart of Northern Brittany, Saint-Brieuc Armor Agglomération fosters innovation and research, offering financial aid and support to local businesses for economic growth |
452 |
| 23 |
EPSM Caenepsm-caen.fr
Provides mental health services across Calvados for all ages, including specialized care, prevention, and support for vulnerable populations. |
442 |
| 24 |
Chambre d'agriculture de Bretagnebretagne.chambres-agriculture.fr
Representing farmers, providing expertise to public services and local authorities, supporting farmers in business development and professional adaptation. |
439 |
| 25 |
Ville de Saint-Malosaint-malo.fr
Historic coastal city offering rich cultural events, maritime activities, diverse tourism facilities, and serving as a key transport and sports hub. |
438 |
| 26 |
Carsat Bretagnecarsat-bretagne.fr
French social security body, retirement benefits, occupational risk prevention, support for vulnerable individuals, senior citizens' assistance. Regional economic player. |
418 |
| 27 |
Service Départemental d'Incendie et de Secours du Morbihan (SDIS56)sdis56.fr
The Departmental Fire and Rescue Service operates 65 fire stations in three districts, managing over 45,000 emergency interventions annually |
401 |
| 28 |
EPSM Morbihanepsm-morbihan.fr
Provides psychiatric care for children, adolescents, adults, and elderly, managing health and social structures across eastern Morbihan with a focus on specialized services and partnerships. |
360 |
| 29 |
Hôpital de Saint-Brieucghtarmor.bzh
Provides specialized medical care including surgery, maternity, neonatology, dialysis, oncology, and advanced consultations across two hospital sites in Brittany. |
355 |
| 30 |
Cap l'Orient agglomérationlorient-agglo.bzh
Group of 19 communes collaborating to create a dynamic, ambitious, and sustainable territory focused on community and quality of life. |
334 |
| 31 |
CENTRE HOSPITALIER DES PAYS DE MORLAIXch-morlaix.fr
Comprehensive medical, surgical, obstetric, psychiatric, and rehabilitation services with specialized oncology, geriatrics, maternity, pediatrics, and medico-social care across multiple locations. |
332 |
| 32 | 324 | |
| 33 |
Groupe Hospitalier Rance-Emeraudegh-re.fr
Healthcare network including hospitals in Saint-Malo, Dinan, and Cancale, providing emergency, surgery, medicine, obstetrics, and elderly care services. |
316 |
| 34 |
Labocéalabocea.fr
A multidisciplinary team in Brittany providing analysis services in health, environment, and agri-food sectors, offering sampling, laboratory testing, advice, and expertise with transparency and reliability |
313 |
| 35 |
Institut d'études politiques de Rennessciencespo-rennes.fr
An institution of higher education providing multidisciplinary training to students for roles in public, private, and non-profit sectors, nationally and internationally |
277 |
| 36 |
Académie militaire de Saint-Cyr Coëtquidanterre.defense.gouv.fr
Initial training for army officers, preparing them for operational roles and a full career, emphasizing leadership, resilience, and adaptability to complex challenges. |
264 |
| 37 |
EPSM du Finistère Sudepsm-quimper.fr
Public mental health facility located in Quimper, providing mental health services and support to individuals in need |
258 |
| 38 |
Agence régionale de santé Bretagnesante.fr
The regional health agency in Brittany implements health policies, from prevention to medical care, in line with national guidelines and local input |
257 |
| 39 |
CCI Ille-et-Vilainebretagne.cci.fr
Support and accelerate over 60,000 local businesses through project assistance, training, innovation, ecological transition, and managing key regional infrastructure. |
251 |
| 40 |
Ville de Saint-Brieucsaint-brieuc.bzh
Provides municipal services, urban planning, citizen participation platforms, event information, and local news to support community development and engagement. |
249 |
| 41 |
GENAVIRgenavir.fr
Operation and maintenance of oceanographic vessels, scientific equipment, and data acquisition supporting maritime scientific exploration and research community. |
249 |
| 42 |
Assurance Maladie Ille-et-Vilaine (CPAM)ameli.fr
Private organization carrying out public service missions in health insurance in Ille-et-Vilaine, ensuring access to healthcare, promoting health preservation, and improving healthcare effectiveness |
241 |
| 43 |
Lamballe Terre & Mer Agglomérationlamballe-terre-mer.bzh
A community of 38 municipalities with a population of 69,000 residents, offering diverse sectors, coastline, ports, natural spaces, tourism office, and social welfare services |
233 |
| 44 |
Chambre de Métiers et de l'Artisanat de Bretagnecma-bretagne.fr
Support and advice for artisans and future artisans through training, business creation, development, and cessation formalities in Brittany. |
227 |
| 45 |
Préfecture de zone SGAMI Ouest
It coordinates non-military security measures, civil security resources, and provides administrative support to security forces in its region. |
226 |
| 46 |
DREAL Bretagnebretagne.developpement-durable.gouv.fr
The company works on environmental, housing, and development policies in Brittany region, promoting sustainable development through expertise, partnerships, and citizen engagement |
224 |
| 47 | 222 | |
| 48 |
Dinan Agglomérationdinan-agglomeration.fr
Management and development of a large intercommunal area in Northern Brittany, covering 65 communes and serving over 100,000 residents. |
208 |
| 49 |
Golfe du Morbihan - Vannes agglomérationgolfedumorbihan-vannesagglomeration.bzh
Coordination and management of public services and development across 34 municipalities formed by merging three local communities. |
207 |
| 50 |
Brocéliande Atlantiquech-bretagne-atlantique.fr
A healthcare group serving 400,000 residents with 6,000 health professionals, 400 doctors, 3,700 beds, and 93,000 ER visits annually |
205 |
| 51 |
Archipel habitatarchipel-habitat.fr
public housing office managing 17,000 social housing units, serving 30,000 residents, ensuring quality service and property care |
202 |
| 52 |
École Navaleecole-navale.fr
A prestigious French institution responsible for educating officers of the French Navy in various areas such as ships, submarines, and naval aviation |
200 |
| 53 |
Centre Hospitalier de Fougèresch-fougeres.fr
A hospital in Fougères offering a wide range of medical services, specialized consultations, and a care facility for the elderly |
199 |
| 54 |
CDG 35 (Centre de Gestion de la Fonction Publique Territoriale d'Ille et Vilaine)cdg35.fr
Recruitment and training of job seekers, students, and employees to meet temporary needs of local public authorities with professional development. |
191 |
| 55 |
Ville de Cesson-Sévignéville-cesson-sevigne.fr
Official account for the city of Cesson-Sévigné, providing updates and information about the municipality and its services to the community |
182 |
| 56 |
Groupe Hospitalier Centre Bretagnech-centre-bretagne.fr
Public healthcare institution offering modern medical, surgical, rehabilitation, and accommodation services across multiple sites for 142,000 residents. |
181 |
| 57 |
Morlaix Communautémorlaix.fr
Morlaix Communauté is a public inter-municipal cooperation institution working to improve the daily lives of residents through development projects |
177 |
| 58 |
Caf d'Ille-et-Vilainecaf.fr
A private company providing public services to support families, fight against social inequalities, and promote social cohesion in Ille-et-Vilaine, France |
171 |
| 59 |
École normale supérieure de Rennesens-rennes.fr
The company is a public institution focused on training high-level scientific leaders for public service careers through interdisciplinary education and international collaborations |
165 |
| 60 |
Quimper Bretagne Occidentale / Ville de Quimperquimper-bretagne-occidentale.bzh
Local government managing public services, urban planning, environment, social programs, culture, sports, and recruitment across fourteen communes. |
160 |
| 61 |
IUT de Vannesiutvannes.fr
The company provides training in Commerce, Management, IT, and Data Science for quick integration into the job market through various programs |
159 |
| 62 |
IFPS · Institut de Formation des Professionnels de Santé — CHU Brestifps-brest.bzh
Specialized healthcare training institute offering state-approved programs for various healthcare professions including nursing, physiotherapy, and healthcare management Visit website for more information |
158 |
| 63 |
IGR-IAE Rennesigr.univ-rennes.fr
A university of management offering personalized education, practical experience, international opportunities, industry-focused diplomas, and a vibrant student life for professional success |
155 |
| 64 |
IETR - Institut d'Electronique et des Technologies du numéRique - UMR CNRS 6164ietr.fr
A public research laboratory specializing in electronics and digital technologies, focusing on scientific challenges related to digital transformation of society and environmental transitions |
155 |
| 65 |
IUT de Rennesiut-rennes.univ-rennes.fr
A public higher education institution offering technology programs in various departments, providing initial and continuing education with a focus on professional development |
151 |
| 66 |
Bmh - Brest métropole habitatbm-h.fr
Develops, constructs, and manages social housing across the Brest region, providing quality accommodation for tenants and homeowners alike, from apartments to senior residences. |
150 |
| 67 |
Auray Quiberon Terre Atlantiqueauray-quiberon.fr
Support sustainable development of urban, rural, and coastal areas, economic growth, tourism, environment, housing, mobility, culture, and social services. |
150 |
| 68 |
SAINT-MALO AGGLOMÉRATION (Coopération intercommunale)stmalo-agglomeration.fr
Coordination of economic growth, tourism promotion, urban planning, social housing, transport, environmental protection, waste management, and sports facilities development. |
147 |
| 69 |
IUT Brest Morlaixiut-brest.fr
A higher education institute in France offering Bachelor's and Professional Licenses in various fields, with a focus on industry, civil engineering, biology, commerce, and management They also have an Alternance and Continuing Education Center |
146 |
| 70 |
Guingamp-Paimpol Agglomérationguingamp-paimpol-agglo.bzh
Manages 57 communes, providing public services for 76,229 inhabitants. Balances coastal and rural areas, promoting tourism, agriculture, and agribusiness. |
146 |
| 71 |
SPL EAU DU BASSIN RENNAISeaudubassinrennais.fr
Public local company managing water production and distribution for 470,000 residents across multiple municipalities in Rennes area with 140 employees. |
143 |
| 72 |
IUT Lannionuniv-rennes.fr
A component of University of Rennes, the Institute provides education, research, and technology transfer in fields like IT, communication, multimedia, and telecommunications |
141 |
| 73 |
GRETA-CFA Bretagne Sudbit.ly
A public network in Brittany offering ongoing education for adults by pooling resources from over 260 schools, providing adult education and apprenticeship programs |
137 |
| 74 |
Ecole nationale supérieure de Chimie de Rennesensc-rennes.fr
For almost 100 years, ENSCR aims to train chemical engineers for various industries worldwide, equipping graduates to lead national and international projects autonomously |
135 |
| 75 |
AMIAD - French Agency for AI in Defencedefense.gouv.fr
Accelerate AI integration within the defense ministry to enhance military capabilities and ensure success in future warfare scenarios. |
129 |
| 76 |
Centre Hospitalier de Douarnenezch-douarnenez.bzh
A public health facility in Douarnenez, part of a regional hospital network, collaborating with other hospitals to provide quality healthcare services |
128 |
| 77 |
ENSIBSwww-ensibs.univ-ubs.fr
Offers engineering degrees in various specialties, including cybersecurity and energy, with hands-on training on two campuses near the sea. |
126 |
| 78 |
Concarneau Cornouaille Agglomérationcca.bzh
An intermunicipal structure located in Finistère, Brittany, France, comprising 9 cities and succeeding the Concarneau Cornouaille community of municipalities |
122 |
| 79 |
Océanopolisoceanopolis.com
National scientific culture center dedicated to the ocean, showcasing marine biodiversity through aquariums to raise awareness for ocean protection and sharing knowledge. |
119 |
| 80 |
Brest en vuebrestenvue.fr
Management of major public facilities for Brest Métropole, ensuring public interest, responsiveness, and dynamic operational flexibility. |
114 |
| 81 |
Choose Paris Regionchooseparisregion.org
Promotes Paris Region globally, attracts and supports businesses and international talent, developing strategic sectors and fostering innovation for a sustainable future. |
113 |
| 82 |
CCI du Morbihanbretagne.cci.fr
Provides expert advice and support to entrepreneurs in commerce, industry, and services for creating, starting, improving, buying, and selling businesses. |
110 |
| 83 |
Quimperlé Communautéquimperle-communaute.bzh
A Breton agglomeration community consisting of 16 municipalities in France, focused on local development and collaboration between member towns |
109 |
| 84 |
REDON Aggloredon-agglomeration.bzh
Intercommunal structure managing 31 communes, providing public services, promoting local events, and facilitating public debate and information sharing. |
108 |
| 85 |
Hôpital Régional d'Instruction des Armées Clermont-Tonnerrehiaclermonttonnerre.sante.defense.gouv.fr
Offers comprehensive medical services to military and civilian patients, focusing on infectious diseases, emergency care, and specialized health services. |
106 |
| 86 |
IRDL - UMR CNRS 6027/UBS/ENSTA/INP UBO/UBOirdl.fr
Leading marine mechanical systems research institute in France and Europe, specializing in material mechanics and structures, supporting maritime economy in Brittany |
104 |
| 87 |
Ploërmel Communautéploermelcommunaute.bzh
A dynamic Breton community of 30 communes offering natural beauty, cultural heritage, diverse economy, employment opportunities, and vibrant local events. |
102 |
| 88 |
Compagnie des Ports du Morbihancompagniedesportsdumorbihan.com
A company managing department-owned marinas and heritage sites to meet the needs of the Morbihan region, established by the Department of Morbihan in 2012 |
97 |
| 89 |
GHT Armor
The Territorial Hospital Group (GHT) created in 2016 aims to provide common and graduated patient care for equal access to secure, quality healthcare |
93 |
| 90 |
CCI Bretagnebretagne.cci.fr
Represents over 179,000 regional businesses, supports enterprise growth, skills training, and contributes to territorial attractiveness and planning. |
91 |
| 91 |
Théâtre National de Bretagnet-n-b.fr
Public theatre in Rennes focusing on dramatic arts, led by Arthur Nauzyciel, producing and promoting theatrical performances. |
91 |
| 92 |
Destination Rennesdestination-rennes.fr
Provides tourist information and services to visitors and residents of the Rennes Metropolitan area, welcoming over 200,000 people annually. It is Brittany's only 4-star tourist office. |
90 |
| 93 |
Mairie de Saint-Jacques de la Landest-jacques.fr
Local government managing three distinct neighborhoods, fostering community growth, and promoting dynamic living in a growing suburban area. |
89 |
| 94 |
Mairie de Fougèresfougeres.fr
A government administration company based in France, providing services and maintaining operations for the community of Fougères |
89 |
| 95 |
Ville de Dinandinan.fr
Historic city with rich cultural heritage, vibrant economy, public service employment, and commitment to quality of life and professional development. |
88 |
| 96 |
Leff Armor communautéleffarmor.fr
A community bringing together 27 municipalities to collaborate and work towards common goals for the region's development and improvement |
86 |
| 97 |
Liffré-Cormier Communautéliffre-cormier.fr
Liffré-Cormier Communauté provides tailored support for new businesses, advises existing economic actors, develops business locations, and supports training and employment in the region |
85 |
| 98 |
Atelier industriel de l'aéronautique de Bretagnedefense.gouv.fr
An industrial aeronautical maintenance facility for the French Ministry of Defense, specializing in maintenance, repair, and modifications of military aircraft and equipment |
83 |
| 99 |
Bibus Brestbibus.fr
Transportation company providing bus, tramway, cable cars, bike services, and on-demand transport in Brest metropolitan area, including services for people with reduced mobility |
81 |
| 100 |
CITEDIAcitedia.com
Management of local public services including mobility, economic development, events, entertainment, tourism, sports, leisure, and security with public ownership. |
80 |
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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 Oct 24, 2026.
More company lists in Brittany
- The largest companies in Brittany 2,535
- Retail chains in Brittany 321
- Manufacturers in Brittany 209
- Family-owned companies in Brittany 190
- Food and Beverage Manufacturing companies in Brittany 165
- Software Development companies in Brittany 123
- Distributors and wholesalers in Brittany 119
- SaaS companies in Brittany 119
- Consumer goods companies in Brittany 112
- Critical infrastructure operators in Brittany 110
- Food and beverage companies in Brittany 110
- Retail companies in Brittany 96
- IT services companies in Brittany 96
- Contract manufacturers in Brittany 88
- Healthcare providers in Brittany 84
- IT Services and IT Consulting companies in Brittany 81
- Hardware manufacturers in Brittany 77
- Financial services firms in Brittany 73
- Accounting firms in Brittany 72
- Government Administration companies in Brittany 71
- Accounting companies in Brittany 69
- Consulting firms in Brittany 68
- Construction companies in Brittany 65
- Law Practice companies in Brittany 64
The same list elsewhere in France
- Public sector organisations in France 3,653
- Public sector organisations in Île-de-France 950
- Public sector organisations in Auvergne-Rhône-Alpes 411
- Public sector organisations in Provence-Alpes-Côte d'Azur 373
- Public sector organisations in Grand Est 361
- Public sector organisations in Nouvelle-Aquitaine 281
- Public sector organisations in Occitanie 273
- Public sector organisations in Hauts-de-France 238
- Public sector organisations in Pays de la Loire 172
- Public sector organisations in Normandy 137
- Public sector organisations in Bourgogne-Franche-Comté 123
- Public sector organisations in Centre-Val de Loire 107
- Public sector organisations in Paris 441
- Public sector organisations in Marseille 103
- Public sector organisations in Toulouse 70
- Public sector organisations in Lyon 65
- Public sector organisations in Strasbourg 52
- Public sector organisations in Bordeaux 50
- Public sector organisations in Nantes 48
- Public sector organisations in Lille 45
- Public sector organisations in Rennes 42
- Public sector organisations in Montpellier 39
- Public sector organisations in Grenoble 35
- Public sector organisations in Nice 33