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Top 30 professional services firms in Rennes

Tamtam tracks 44 professional services firms headquartered in Rennes. This list ranks the 30 largest by number of employees on LinkedIn, led by Interaction Interim, RBI and Geirec. Their median headcount is 45. Half of them were founded in 2003 or later.

🇫🇷 Rennes30 companiesUpdated Nov 12, 2026

The professional services sector in Rennes features a mix of established mid-sized firms and younger companies. Key activities include staffing and recruiting, IT services, and accounting. Interaction Interim, with 1055 employees, provides temporary work and recruitment. RBI specializes in information systems design and integration, while Geirec and CAPEOS offer comprehensive accounting and advisory services. Groupe Creative focuses on IT and digital transformation projects.

A notable pattern among these companies is their strong local presence, with all listed headquarters located in Rennes. This suggests a concentration of professional expertise within the city. The firms also span a range of founding dates, from Geirec and CAPEOS established in 1979, to newer entities like Happy to meet you, founded in 2016, indicating a continuous evolution of the professional services landscape.

#CompanyIndustryHeadquarters EmployeesFounded
1
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.

Staffing and Recruiting 🇫🇷 Rennes 1,055 1991
2
RBIrbi-informatique.fr

Specializing in information systems design, implementation, and integration, RBI-Informatique offers services in infrastructure, collaboration, and management solutions for businesses

IT Services and IT Consulting 🇫🇷 Rennes 468 1981
3
Geirecgeirec.com

An independent regional cabinet with a national focus, GEIREC supports businesses with expertise and values, offering daily partnership, confidentiality, competence, and responsiveness

Accounting 🇫🇷 Rennes 308 1979
4
CAPEOScapeos.fr

Provides comprehensive accounting, legal, and tax services alongside audit, wealth management, and IT solutions for companies across diverse sectors through local offices.

Accounting 🇫🇷 Rennes 266 1979
5
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.

IT Services and IT Consulting 🇫🇷 Rennes 232 2008
6
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.

Staffing and Recruiting 🇫🇷 Rennes 178 1991
7
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

Motor Vehicle Parts Manufacturing 🇫🇷 Rennes 137 1975
8
Tourny Meyertournymeyer.fr

Offers business real estate consulting, sales, and leasing services for offices, warehouses, retail, hotels, and urban developments across multiple French cities.

Real Estate 🇫🇷 Rennes 101 1990
9
TALENZ TOADENNtalenz.fr

Multidisciplinary consulting firm supporting entrepreneurs and business leaders with strategy, finance, compliance, audit, legal, HR, and technology solutions.

Business Consulting and Services 🇫🇷 Rennes 92 n/a
10
ADENTadentingenierie.com

Designing sustainable and adaptable agri-food factories that are both thoughtful and harmonious in their construction and operation

Construction 🇫🇷 Rennes 92 2006
11
CYIMcyim.com

A company specializing in IT and audiovisual services for medical societies, offering digital solutions for medical congresses and associations

IT Services and IT Consulting 🇫🇷 Rennes 88 2001
12
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.

Human Resources Services 🇫🇷 Rennes 71 2016
13
L'Optimiste le Groupeloptimiste.fr

Collective of experts providing strategy, accounting, HR, legal, financing, and CSR support to over 1,500 SMEs in France.

Accounting 🇫🇷 Rennes 68 2016
14
Provectioprovectio.fr

IT services provider offering IT management, security, cloud computing, telecommunications, and network availability for businesses, providing support, strategy, and technical expertise

Telecommunications 🇫🇷 Rennes 48 2004
15
CELIADEceliade.com

Experienced jurists providing social law expertise, professional training, and dedicated support to staff representatives for improved social dialogue and mandate management.

Legal Services 🇫🇷 Rennes 45 2015

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16
Immobilière d’Entrepriseimmobiliere-entreprise.fr

Offers specialized professional and commercial real estate services across multiple locations, leveraging two decades of local market knowledge and active community involvement.

Real Estate 🇫🇷 Rennes 42 1996
17
AGC Cuma Ouestouest.cuma.fr

An association providing accounting and management services for agricultural cooperatives in the western region, with a focus on expert accountant guidance

Accounting 🇫🇷 Rennes 40 n/a
18
SpikeeLabsspikeelabs.fr

SpikeeLabs provides information system design, development, integration, and support services with a focus on growth, innovation, and strong human values

IT Services and IT Consulting 🇫🇷 Rennes 38 2016
19
IDÉISideis.com

Specialized training organization focusing on management and communication skills at work, offering tailored solutions to enhance relationships, teamwork, and enthusiasm

Professional Training and Coaching 🇫🇷 Rennes 36 1997
20
Ouikerouiker.fr

A one-stop solution for rental property investment projects in France, from property search to management, covering renovations, furnishing, renting, and leasing Operating in 19 cities

Real Estate 🇫🇷 Rennes 32 2020
21
DUGUESCLIN NOTAIRESnotaires-duguesclin.fr

A notarial firm with offices in Rennes and Paris, offering a wide range of traditional and specialized services with a focus on excellence

Legal Services 🇫🇷 Rennes 31 1610
22
Carcreff, Société d'Avocatscarcreff-avocats.com

Business law firm providing global and pragmatic legal solutions for complex strategic, investment, taxation, and social law issues, tailored to clients' personal aspirations

Legal Services 🇫🇷 Rennes 28 1971
23
Younight Hospitalityyounight-hospitality.com

A hospitality management company assisting with hotel projects from acquisition to operations, ensuring thorough support throughout the entire process

Hospitality 🇫🇷 Rennes 24 n/a
24
Serenis Consultingserenis-consulting.fr

Specialized consulting firm auditing property taxes for professionals 18 years of experience, serving over 10,000 clients in France Offers comprehensive services and sponsors athletes

Financial Services 🇫🇷 Rennes 22 2003
25
Net-ngnet-ng.com

A Rennes-based ESN specializing in custom Python web app development, providing tailored solutions across various industries since 2003

IT Services and IT Consulting 🇫🇷 Rennes 20 2003
26
Theodore Searchtheodore-search.com

Specializing in executive search and recruitment, this firm offers tailored support for strategic hires They are also dedicated to fighting recruitment discrimination

Human Resources Services 🇫🇷 Rennes 16 2002
27
Capnot Notaires - L’Expertise Notarialecapnot.fr

CAPNOT is a network of notarial studies created in 2015, bringing together over 130 notaries and 560 employees to offer comprehensive notarial services

Legal Services 🇫🇷 Rennes 12 2015
28
CLEPERcleper.fr

Provides human resources consulting focused on career management, leadership development, and HR strategy for companies in Brittany and Pays de la Loire.

Human Resources Services 🇫🇷 Rennes 9 2009
29
Farsight VRfarsight-vr.com

FARSIGHT specializes in creating custom virtual reality environments, augmented reality applications, and precise 3D modeling using the latest technologies

Professional Training and Coaching 🇫🇷 Rennes 9 2015
30
COTÉ PROFINANCEcoteprofinance.fr

We are a wealth management consulting firm offering services such as asset assessment, tax and estate planning, financial and real estate investments

Investment Management 🇫🇷 Rennes 8 2017

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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 12, 2026.

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