The professional services firms in Brittany include a mix of business consulting, IT services, and accounting firms. Groupe SAMSIC offers tailored solutions in facility management and HR services. Keyrus focuses on reliable intelligence foundations and performance steering. Interaction Interim provides temporary work and recruitment services. Groupe Cogedis offers accounting, management, legal, and HR consultancy.
Several companies in the list, such as Groupe SAMSIC, Interaction Interim, and RBI, are based in Rennes or nearby Cesson-Sévigné, indicating a cluster of professional services activity in this area. ABER Propreté and NET PLUS specialize in cleaning and facilities services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Groupe SAMSICsamsic.com
With over 30 years of experience, we prioritize human and professional values while offering tailored solutions in facility management and HR services |
6,680 | |||
| 2 |
Keyruskeyrus.com
Architects reliable intelligence foundations, human-in-command governance, and performance steering to operationalize intelligence for adaptive, resilient, continuously improving organizations. |
2,020 | |||
| 3 |
Interaction Interiminteraction-interim.com
National network providing temporary work, recruitment for fixed-term and permanent contracts, training, support, and consulting services across all business sectors. |
1,055 | |||
| 4 |
Groupe Cogedis - Comptabilité et conseil aux entreprisescogedis.com
Providing accounting, management, legal, and human resources consultancy services alongside strategic wealth management and environmental advice for professionals and agricultural business owners. |
783 | |||
| 5 |
ABER Propretéaberproprete.fr
Providing high-quality industrial cleaning and hygiene services with continuous employee training and precise service monitoring since 1975. |
682 | |||
| 6 |
NET PLUSnet-plus.fr
A company specializing in cleaning services, prioritizing customer satisfaction, quality interventions, and social responsibility with a focus on employee well-being and respect |
521 | |||
| 7 |
RBIrbi-informatique.fr
Specializing in information systems design, implementation, and integration, RBI-Informatique offers services in infrastructure, collaboration, and management solutions for businesses |
468 | |||
| 8 |
Ouest Conseilsouestconseils.bzh
Providing accounting, audit, and strategic management consulting for Breton businesses, managing payroll and digital transition to ensure client success and local growth. |
450 | |||
| 9 |
Office Notarial Anastasia Moreaumoreau-fougeres.notaires.fr
Located in the heart of Fougères, this company offers legal services in real estate, family, and corporate law, focusing on accessibility, listening, and modernity |
447 | |||
| 10 | 402 | ||||
| 11 |
Cerfrance Côtes d'Armorcerfrance22.fr
Leading accounting and consulting firm providing strategic support, financial expertise, and social management services for small businesses, farmers, artisans, and independent professionals. |
313 | |||
| 12 |
Geirecgeirec.com
An independent regional cabinet with a national focus, GEIREC supports businesses with expertise and values, offering daily partnership, confidentiality, competence, and responsiveness |
308 | |||
| 13 |
SPCservicepro-bretagne.com
This company specializes in industrial automation and robotics, supporting integrators and manufacturers in their projects with expert guidance. |
277 | |||
| 14 | 266 | ||||
| 15 |
Igam Expertise Comptableigam.fr
Accounting and advisory network serving 6000 clients across various sectors with 35 offices and 300 professionals in western France. |
266 | |||
| 16 |
VIRAGE CONSEILvirageconseil.com
Specializes in business development, sales growth, professional training, and commercial animation with a strong presence in telemarketing and merchandising. |
262 | |||
| 17 | 259 | ||||
| 18 |
SCC Raising Places' Valuesscc.fr
Manages, transforms, and invents unique living spaces, focusing on strategic and operational services to increase the value of properties for clients and partners. |
233 | |||
| 19 |
Groupe Creativegroupe-creative.fr
Works with clients on IT and digital transformation projects, offering expertise in consulting, creation, development, research, and innovation across various digital domains. |
232 | |||
| 20 |
Intérim Emploi Serviceinterim-emploi-service.fr
A company in Rennes offering temporary work, job placements, and professional development while prioritizing employee skills, safety, diversity, and discrimination prevention |
228 | |||
| 21 |
Axys Consultantsaxys-consultants.com
Management consultancy providing digital transformation, data analytics, and operational excellence services across procurement, finance, marketing, and sales departments for large international corporate clients. |
227 | |||
| 22 |
Cerfrance Finistèrefinistere.cerfrance.fr
Accounting and consulting firm providing services to businesses and their leaders in Finistère, specializing in advice and expertise in accounting |
216 | |||
| 23 |
Aqualehaaqualeha.com
The company offers a range of services to prevent food, safety, and environmental risks for the protection of assets and individuals |
216 | |||
| 24 |
Icoopaicoopa.bzh
ICOOPA is a management and accounting association founded in 1977, serving over 5,000 members in agriculture, crafts, and trade sectors in Brittany, France |
195 | |||
| 25 |
Groupe SECOBsecob.fr
Provides accounting, payroll, and audit services supporting over 3500 companies in creation, development, and business transfer phases. |
192 | |||
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. | |||||
| 26 |
Groupe Interactioninteraction-groupe.com
This company facilitates employment access, offering temp agencies, recruitment firms, specialized services, digital solutions, and a training center for diverse job seekers. |
178 | |||
| 27 |
Arkéa Investment Servicesarkea-is.com
Asset management company combining financial and extra-financial performance, offering diverse investment solutions for individual and institutional clients. |
171 | |||
| 28 |
Lavancelavance.com
Provider of vehicle washing equipment and services including high-pressure centers, tunnels, water recycling, financing, maintenance, and station operation support. |
168 | |||
| 29 | 166 | ||||
| 30 |
isatechisatech.fr
International IT solutions provider specializing in ERP & CRM solutions, Microsoft Dynamics 365 expertise, BI, Azure, and professional services for various industry sectors worldwide |
158 | |||
| 31 |
Groupe Astengroupe-asten.fr
A company specializing in digital transformation, offering hosting, cybersecurity, custom software development, retail solutions, and consulting with a focus on Brittany's growth |
150 | |||
| 32 |
TALENDItalendi.com
A social enterprise offering industrial and digital services, employing over 550 people, including 420 with disabilities, with expertise in various fields like assembly and logistics |
137 | |||
| 33 |
OJC Conseilojc-consulting.com
This consulting firm offers IT services for purchase, sales, and treasury management Specializing in IT transformation projects with expertise in IVALUA solutions |
135 | |||
| 34 |
E&C Expertise Comptableby-ec.fr
Independent accounting and collaborative services firm providing expertise in various areas such as accounting, business advisory, legal counseling, payroll, and administration support |
127 | |||
| 35 |
In Extenso Bretagneinextenso.fr
A major player in accounting and consulting for small and medium-sized businesses, offering support in all areas of business management |
125 | |||
| 36 |
Adventieladventiel.fr
Adventiel is a specialized consultancy firm assisting agricultural and food industries in transitioning to sustainable models through customized digital solutions |
107 | |||
| 37 |
Pros-Consultepros-consulte.com
Supports organizations in preventing psychosocial risks, enhancing mental health, and fostering well-being at work, improving collective performance and employee engagement. |
101 | |||
| 38 |
Tourny Meyertournymeyer.fr
Offers business real estate consulting, sales, and leasing services for offices, warehouses, retail, hotels, and urban developments across multiple French cities. |
101 | |||
| 39 |
TALENZ TOADENNtalenz.fr
Multidisciplinary consulting firm supporting entrepreneurs and business leaders with strategy, finance, compliance, audit, legal, HR, and technology solutions. |
92 | |||
| 40 |
ADENTadentingenierie.com
Designing sustainable and adaptable agri-food factories that are both thoughtful and harmonious in their construction and operation |
92 | |||
| 41 |
APAVE REGION BRETAGNE-MAINEapave.com
Apave provides comprehensive risk management services to companies and communities worldwide, aiming to increase safety, protect the environment, and optimize organizational performance |
89 | |||
| 42 | 88 | ||||
| 43 |
Happy to meet youhappytomeetyou.fr
Provides human resources and communication expertise to companies, focusing on executive recruitment and HR consulting, including organizational transformation, development, and skill assessments. |
71 | |||
| 44 |
Excelis Conseilexcelis-conseil.fr
Accounting and audit firm with 75 professionals and 6 partners in Rennes and Vannes Serving 1,500+ clients in the Grand Ouest region |
70 | |||
| 45 |
IFOPSEifopse.com
Specializing in safety training and consulting for nearly 40 years, the company helps manage personnel safety in areas such as fire, chemical, and crisis management |
70 | |||
| 46 |
L'Optimiste le Groupeloptimiste.fr
Collective of experts providing strategy, accounting, HR, legal, financing, and CSR support to over 1,500 SMEs in France. |
68 | |||
| 47 |
COMPTAGESMAcomptagesma.com
Comptagesma guides entrepreneurs from company creation to accounting, tax optimization, and strategic advice, with a focus on proximity, technology, and social responsibility |
67 | |||
| 48 |
SAPIENCE AUDIT Cabinet de commissariat aux comptesaac-ec.com
An independent accounting and consulting firm providing tailored support and strategic advice to business owners in Pays de Lorient |
63 | |||
| 49 |
Télémaquetelemaque-penelope.nous-recrutons.fr
A leading call center company in France offering services such as lead generation, telemarketing, appointment setting, sales, and customer support with extensive training and growth opportunities |
60 | |||
| 50 |
Cabinet BOURGOIS - Groupe MERLINcabinet-merlin.fr
A recognized player in environmental consulting and engineering for over 80 years, based in Betton, France, as a subsidiary of Groupe MERLIN |
53 | |||
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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 Brittany
- The largest companies in Brittany 3,058
- Companies with in-house R&D in Brittany 366
- Retail chains in Brittany 344
- Manufacturers in Brittany 307
- Multinational companies in Brittany 264
- Family-owned companies in Brittany 201
- Food and Beverage Manufacturing companies in Brittany 182
- Public sector organisations in Brittany 165
- Hardware manufacturers in Brittany 148
- Distributors and wholesalers in Brittany 145
- Software Development companies in Brittany 132
- Food and beverage companies in Brittany 130
- SaaS companies in Brittany 128
- Critical infrastructure operators in Brittany 120
- Consumer goods companies in Brittany 115
- IT services companies in Brittany 113
- Education providers in Brittany 112
- Agriculture companies in Brittany 108
- Retail companies in Brittany 107
- IT Services and IT Consulting companies in Brittany 101
- Consulting firms in Brittany 99
- Healthcare providers in Brittany 97
- Contract manufacturers in Brittany 93
- Construction companies in Brittany 92
The same list elsewhere in France
- Professional services firms in France 6,611
- Professional services firms in Île-de-France 3,377
- Professional services firms in Auvergne-Rhône-Alpes 711
- Professional services firms in the Hauts-de-Seine department 629
- Professional services firms in Provence-Alpes-Côte d'Azur 433
- Professional services firms in the Rhône department 400
- Professional services firms in Occitanie 399
- Professional services firms in Grand Est 316
- Professional services firms in Nouvelle-Aquitaine 308
- Professional services firms in Hauts-de-France 260
- Professional services firms in Pays de la Loire 254
- Professional services firms in the Bouches-du-Rhône department 249
- Professional services firms in the Haute-Garonne department 208
- Professional services firms in the Nord department 178
- Professional services firms in the Loire-Atlantique department 158
- Professional services firms in the Gironde department 151
- Professional services firms in Normandy 114
- Professional services firms in the Yvelines department 108
- Professional services firms in the Ille-et-Vilaine department 94
- Professional services firms in Paris 2,241
- Professional services firms in Lyon 265
- Professional services firms in Toulouse 139
- Professional services firms in Marseille 123
- Professional services firms in Boulogne-Billancourt 102