# 25 leading consulting firms in Rennes

Tamtam tracks 25 consulting firms headquartered in Rennes. This list ranks all of them by number of employees on LinkedIn, led by RBI, Geirec and CAPEOS. Their median headcount is 44. Half of them were founded in 2008 or later.

These Rennes-based consulting firms primarily operate in IT services, accounting, and broader business consulting. The companies range from established firms like RBI, founded in 1981, to younger entities such as Happy to meet you, established in 2016. Most appear to be mid-sized firms, with employee counts varying from 36 to 468.

Key players include RBI, specializing in information systems, and Geirec, an independent regional accounting cabinet. Groupe Creative focuses on IT and digital transformation projects, while Tourny Meyer offers business real estate consulting. A notable pattern is the strong presence of IT services and consulting companies, indicating a concentration of digital expertise in Rennes.

🇫🇷 Rennes · 25 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [RBI](https://www.tamtam.ai/c/rbi-rennes) (rbi-informatique.fr)<br>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 |
| 2 | [Geirec](https://www.tamtam.ai/c/geirec) (geirec.com)<br>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 |
| 3 | [CAPEOS](https://www.tamtam.ai/c/capeos-rennes) (capeos.fr)<br>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 |
| 4 | [Groupe Creative](https://www.tamtam.ai/c/groupe-creative) (groupe-creative.fr)<br>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 |
| 5 | [Tourny Meyer](https://www.tamtam.ai/c/tourny-meyer) (tournymeyer.fr)<br>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 |
| 6 | [6TM](https://www.tamtam.ai/c/6tm) (6tm.com)<br>6TM supports clients in achieving effective communication through web, mobile, and software solutions, with services ranging from e-commerce to custom development and e-tourism | IT Services and IT Consulting | 🇫🇷 Rennes | 100 | 1998 |
| 7 | [TALENZ TOADENN](https://www.tamtam.ai/c/talenz-toadenn) (talenz.fr)<br>Multidisciplinary consulting firm supporting entrepreneurs and business leaders with strategy, finance, compliance, audit, legal, HR, and technology solutions. | Business Consulting and Services | 🇫🇷 Rennes | 92 |  |
| 8 | [ADENT](https://www.tamtam.ai/c/adent) (adentingenierie.com)<br>Designing sustainable and adaptable agri-food factories that are both thoughtful and harmonious in their construction and operation | Construction | 🇫🇷 Rennes | 92 | 2006 |
| 9 | [Happy to meet you](https://www.tamtam.ai/c/happy-to-meet-you) (happytomeetyou.fr)<br>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 |
| 10 | [Fleet Services Group](https://www.tamtam.ai/c/fleet-services-group) (fleetservicesgroup.com)<br>This company offers Sales & Marketing services, specialized in IT It provides go-to-market strategies, lead generation, inside sales, and consulting for large companies | IT Services and IT Consulting | 🇫🇷 Rennes | 71 | 2003 |
| 11 | [L'Optimiste le Groupe](https://www.tamtam.ai/c/l-optimiste-le-groupe) (loptimiste.fr)<br>Collective of experts providing strategy, accounting, HR, legal, financing, and CSR support to over 1,500 SMEs in France. | Accounting | 🇫🇷 Rennes | 68 | 2016 |
| 12 | [LIKSI](https://www.tamtam.ai/c/liksi) (liksi.fr)<br>LIKSI is a software development company in Rennes and Nantes, offering high-quality services with expertise in open source technologies and agile project teams | IT Services and IT Consulting | 🇫🇷 Rennes | 64 | 2017 |
| 13 | [Make the Grade](https://www.tamtam.ai/c/make-the-grade) (hubs.li)<br>A B2B agency supporting business growth through client acquisition, offering strategies in SEO, marketing, and sales to boost online presence and drive revenue | Business Consulting and Services | 🇫🇷 Rennes | 44 | 2018 |
| 14 | [SpikeeLabs](https://www.tamtam.ai/c/spikeelabs) (spikeelabs.fr)<br>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 |
| 15 | [IDÉIS](https://www.tamtam.ai/c/ideis) (ideis.com)<br>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 |
| 16 | [ORNISEC](https://www.tamtam.ai/c/ornisec) (ornisec.com)<br>ORNISEC is a leading cybersecurity consultancy firm offering services such as advice, audits, training, compliance, crisis management, putting a focus on practical and hands-on approach | Computer and Network Security | 🇫🇷 Rennes | 35 | 2020 |
| 17 | [Valorial, cluster d'innovation agri-agro](https://www.tamtam.ai/c/valorial-cluster-d-innovation-agri-agro) (pole-valorial.fr)<br>Cluster supporting sustainable agri-food innovation through personalized programs, tailored consulting, extensive networking, and project financing assistance for 400 members. | Food and Beverage Manufacturing | 🇫🇷 Rennes | 25 | 2006 |
| 18 | [VeoNum](https://www.tamtam.ai/c/veonum) (veonum.com)<br>Rennes-based consultancy firm with a human-centric approach, offering tailored training, benefits, and a focus on R&D in AI, machine learning, and video streaming technologies Join our team! | Software Development | 🇫🇷 Rennes | 25 | 2018 |
| 19 | [Serenis Consulting](https://www.tamtam.ai/c/serenis-consulting) (serenis-consulting.fr)<br>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 |
| 20 | [CLEPER](https://www.tamtam.ai/c/cleper) (cleper.fr)<br>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 |
| 21 | [COTÉ PROFINANCE](https://www.tamtam.ai/c/cote-profinance) (coteprofinance.fr)<br>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 |
| 22 | [JBG Consultants](https://www.tamtam.ai/c/jbg-consultants) (jbg.fr)<br>Consulting firm specializing in organization, supply chain, and information systems for agricultural, agri-food, and distribution sectors, helping companies improve performance and adapt to market changes | Business Consulting and Services | 🇫🇷 Rennes | 8 | 1987 |
| 23 | [Timwi Consulting](https://www.tamtam.ai/c/timwi-consulting) (timwi.com)<br>Specializes in agile software development, architecture, and services using SOA/ESB, Java/JEE, .Net, emphasizing software craftsmanship. | IT Services and IT Consulting | 🇫🇷 Rennes | 8 | 2006 |
| 24 | [ATHENA FINANCE CONSEIL](https://www.tamtam.ai/c/athena-finance-conseil) (athenaconseil.fr)<br>Specializing in corporate finance, this company offers expertise in financial engineering and funding solutions for SMEs/ETIs' projects, advising on growth, restructuring, and acquisitions | Financial Services | 🇫🇷 Rennes | 4 | 2010 |
| 25 | [Réussys](https://www.tamtam.ai/c/reussys) (reussys.com)<br>Develops digital tools for HR to measure and improve employees' emotional states using neuroscience, enhancing workplace wellbeing and performance. | Business Consulting and Services | 🇫🇷 Rennes | 1 | 2016 |

## 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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Source: https://www.tamtam.ai/l/consulting-firms-rennes