# Consulting firms headquartered in the Ille-et-Vilaine department

Tamtam tracks 54 consulting firms headquartered in the Ille-et-Vilaine department. This list ranks the 30 largest by number of employees on LinkedIn, led by INNOVAL, RBI and Geirec. Their median headcount is 71. Half of them were founded in 1999 or later. The most common headquarters are Rennes (17), Cesson-Sévigné (3) and Saint-Malo (2).

These companies in Ille-et-Vilaine predominantly offer business consulting and IT services, alongside accounting and some specialized industrial support. Many are mid-sized firms, with several established in the late 1970s and 1980s. Notable examples include INNOVAL, a cooperative providing advisory and genetics services to livestock farmers; RBI, specializing in information systems design and integration; Geirec, an independent regional cabinet supporting businesses with expertise; and Aqualeha, which offers services to prevent food, safety, and environmental risks.

A significant cluster of these companies, such as RBI, Geirec, CAPEOS, and Groupe Creative, are headquartered in Rennes, indicating its role as a central hub for business and IT services within the department. The presence of firms like INNOVAL and Aqualeha suggests a focus on supporting the agricultural and food industries, which are prominent in the region.

🇫🇷 Ille-et-Vilaine · 30 companies · Updated Nov 15, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [INNOVAL](https://www.tamtam.ai/c/innoval) (innoval.com)<br>Cooperative providing personalized advisory, health, reproduction, and genetics services to livestock farmers for improved performance and sustainability. | Farming | 🇫🇷 Noyal-sur-Vilaine | 732 |  |
| 2 | [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 |
| 3 | [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 |
| 4 | [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 |
| 5 | [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 |
| 6 | [Aqualeha](https://www.tamtam.ai/c/aqualeha) (aqualeha.com)<br>The company offers a range of services to prevent food, safety, and environmental risks for the protection of assets and individuals | Biotechnology Research | 🇫🇷 Vitré | 216 | 1984 |
| 7 | [Groupe SECOB](https://www.tamtam.ai/c/groupe-secob) (secob.fr)<br>Provides accounting, payroll, and audit services supporting over 3500 companies in creation, development, and business transfer phases. | Business Consulting and Services | 🇫🇷 Cesson-Sévigné | 192 | 1963 |
| 8 | [Sodifrance](https://www.tamtam.ai/c/sodifrance) (sodifrance.fr)<br>Provides technology consulting, digital transformation, data management, application and infrastructure services to enhance organizational competitiveness and collaboration. | IT Services and IT Consulting | 🇫🇷 Saint-Grégoire | 172 | 1986 |
| 9 | [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 |
| 10 | [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 |
| 11 | [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 |  |
| 12 | [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 |
| 13 | [APAVE REGION BRETAGNE-MAINE](https://www.tamtam.ai/c/apave-region-bretagne-maine) (apave.com)<br>Apave provides comprehensive risk management services to companies and communities worldwide, aiming to increase safety, protect the environment, and optimize organizational performance | Environmental Services | 🇫🇷 Le Rheu | 89 | 1867 |
| 14 | [BSL - DIMOTRANS Group](https://www.tamtam.ai/c/bsl-dimotrans-group) (dimotrans-group.com)<br>With over 20 years of e-commerce and retail logistics expertise, we offer comprehensive services focused on agility, innovation, and personalized solutions in France | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Bruz | 89 | 1997 |
| 15 | [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 |
| 16 | [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 |
| 17 | [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 |
| 18 | [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 |
| 19 | [HPC Envirotec SAS](https://www.tamtam.ai/c/hpc-envirotec-sas) (hpc.ag)<br>An environmental engineering company specializing in land recycling, consultancy, and infrastructure planning, part of a global alliance offering environmental services worldwide | Environmental Services | 🇫🇷 Saint-Erblon | 54 | 1993 |
| 20 | [Cabinet BOURGOIS - Groupe MERLIN](https://www.tamtam.ai/c/cabinet-bourgois-groupe-merlin) (cabinet-merlin.fr)<br>A recognized player in environmental consulting and engineering for over 80 years, based in Betton, France, as a subsidiary of Groupe MERLIN | Environmental Services | 🇫🇷 Betton | 53 | 1938 |
| 21 | [Oxxeo](https://www.tamtam.ai/c/oxxeo) (oxxeo.fr)<br>A human-sized IT consulting company in Rennes, specializing in digital transformation with a focus on App Engineering, DevOps, Cloud, and Project Management They prioritize employee well-being and career growth | IT Services and IT Consulting | 🇫🇷 Cesson-Sévigné | 46 | 2017 |
| 22 | [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 |
| 23 | [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 |
| 24 | [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 |
| 25 | [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 |
| 26 | [OGI Groupe](https://www.tamtam.ai/c/ogi-groupe) (ogi-groupe.fr)<br>OGI provides successful IT project implementation and management services to companies of all sizes and sectors, offering expertise in software deployment and infrastructure setup | IT Services and IT Consulting | 🇫🇷 Chartres-de-Bretagne | 33 | 2000 |
| 27 | [Synergiz](https://www.tamtam.ai/c/synergiz) (synergiz.com)<br>Provides intuitive, connected, and interactive solutions, specializing in Mixed Reality. Supports businesses with XR projects from start to finish including hardware, software, and custom development. | IT Services and IT Consulting | 🇫🇷 Saint-Malo | 32 | 2011 |
| 28 | [Abelium Entreprises](https://www.tamtam.ai/c/abelium-entreprises) (informatique-logiciel-bretagne.com)<br>A reliable and proactive IT partner providing quality services tailored to clients' needs, with a focus on innovation, technical expertise, and customer support | IT Services and IT Consulting | 🇫🇷 Saint-Malo | 28 | 1999 |
| 29 | [Océane Consulting Data Management](https://www.tamtam.ai/c/oceane-consulting-data-management) (dm.oceaneconsulting.com)<br>Océane Consulting Data Management is a digital transformation company specializing in document, data, and digital solutions for clients in Europe and the Middle East | IT Services and IT Consulting | 🇫🇷 Cesson-Sévigné | 26 |  |
| 30 | [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 |

## 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 15, 2026.

## More company lists in the Ille-et-Vilaine department

- [The largest companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/largest-companies-ille-et-vilaine) (1,454)
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- [Software Development companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/software-development-companies-ille-et-vilaine) (80)
- [Public sector organisations in the Ille-et-Vilaine department](https://www.tamtam.ai/l/public-sector-organisations-ille-et-vilaine) (75)
- [IT Services and IT Consulting companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-ille-et-vilaine) (67)
- [IT services companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/it-services-companies-ille-et-vilaine) (65)
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- [Distributors and wholesalers in the Ille-et-Vilaine department](https://www.tamtam.ai/l/distributors-and-wholesalers-ille-et-vilaine) (58)
- [Food and Beverage Manufacturing companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/food-and-beverage-manufacturing-companies-ille-et-vilaine) (46)
- [Retail companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/retail-companies-ille-et-vilaine) (46)
- [Critical infrastructure operators in the Ille-et-Vilaine department](https://www.tamtam.ai/l/critical-infrastructure-operators-ille-et-vilaine) (45)
- [Financial services firms in the Ille-et-Vilaine department](https://www.tamtam.ai/l/financial-services-firms-ille-et-vilaine) (45)
- [Subscription businesses in the Ille-et-Vilaine department](https://www.tamtam.ai/l/subscription-businesses-ille-et-vilaine) (45)
- [Construction companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/construction-companies-ille-et-vilaine) (43)
- [Law Practice companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/law-practice-companies-ille-et-vilaine) (43)
- [Higher Education companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/higher-education-companies-ille-et-vilaine) (41)
- [Legal Services companies in the Ille-et-Vilaine department](https://www.tamtam.ai/l/legal-services-companies-ille-et-vilaine) (41)

## The same list elsewhere in France

- [Consulting firms in France](https://www.tamtam.ai/l/consulting-firms-france) (4,250)
- [Consulting firms in Île-de-France](https://www.tamtam.ai/l/consulting-firms-ile-de-france) (2,406)
- [Consulting firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/consulting-firms-hauts-de-seine) (563)
- [Consulting firms in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/consulting-firms-auvergne-rhone-alpes) (412)
- [Consulting firms in the Rhône department](https://www.tamtam.ai/l/consulting-firms-rhone) (242)
- [Consulting firms in Occitanie](https://www.tamtam.ai/l/consulting-firms-occitanie) (236)
- [Consulting firms in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/consulting-firms-provence-alpes-cote-dazur) (233)
- [Consulting firms in Grand Est](https://www.tamtam.ai/l/consulting-firms-grand-est) (167)
- [Consulting firms in Nouvelle-Aquitaine](https://www.tamtam.ai/l/consulting-firms-nouvelle-aquitaine) (166)
- [Consulting firms in Hauts-de-France](https://www.tamtam.ai/l/consulting-firms-hauts-de-france) (161)
- [Consulting firms in Pays de la Loire](https://www.tamtam.ai/l/consulting-firms-pays-de-la-loire) (160)
- [Consulting firms in the Haute-Garonne department](https://www.tamtam.ai/l/consulting-firms-haute-garonne) (145)
- [Consulting firms in the Bouches-du-Rhône department](https://www.tamtam.ai/l/consulting-firms-bouches-du-rhone) (129)
- [Consulting firms in the Nord department](https://www.tamtam.ai/l/consulting-firms-nord) (115)
- [Consulting firms in Brittany](https://www.tamtam.ai/l/consulting-firms-brittany) (99)
- [Consulting firms in the Loire-Atlantique department](https://www.tamtam.ai/l/consulting-firms-loire-atlantique) (94)
- [Consulting firms in the Gironde department](https://www.tamtam.ai/l/consulting-firms-gironde) (82)
- [Consulting firms in the Yvelines department](https://www.tamtam.ai/l/consulting-firms-yvelines) (72)
- [Consulting firms in Paris](https://www.tamtam.ai/l/consulting-firms-paris) (1,531)
- [Consulting firms in Lyon](https://www.tamtam.ai/l/consulting-firms-lyon) (163)
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- [Consulting firms in Neuilly-sur-Seine](https://www.tamtam.ai/l/consulting-firms-neuilly-sur-seine) (73)

## The same list elsewhere

- [Consulting firms in the world](https://www.tamtam.ai/l/consulting-firms-in-the-world) (16,009)
- [Consulting firms in Europe](https://www.tamtam.ai/l/consulting-firms-in-europe) (8,899)

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Source: https://www.tamtam.ai/l/consulting-firms-ille-et-vilaine