# The 30 largest professional services firms in the Rhône department

Tamtam tracks 400 professional services firms headquartered in the Rhône department. This list ranks the 30 largest by number of employees on LinkedIn, led by In Extenso, Adéquat Interim & Recrutement and RAS Intérim. Their median headcount is 835. Half of them were founded in 1991 or later. The most common headquarters are Lyon (21) and Villeurbanne (4).

This list details some of the largest professional services firms in the Rhône department. The selection includes a mix of human resources specialists, IT consultants, and engineering firms. Notable companies include In Extenso, a French accounting leader; Adéquat Interim & Recrutement, providing comprehensive temporary work solutions; Boccard, which designs and builds industrial plants; and XEFI, offering IT services for small and medium businesses across Europe. These firms represent a range of services essential to business operations and development.

A clear pattern among these companies is their strong presence in Lyon, which serves as the headquarters for the majority of the listed firms. This concentration highlights Lyon's role as a significant hub for professional services in the region. The founding dates of these companies span from the late 19th century to the early 21st century, indicating a long-standing and evolving professional services sector.

🇫🇷 Rhône · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [In Extenso](https://www.tamtam.ai/c/in-extenso) (inextenso.fr)<br>French accounting leader with broad services for businesses. Offers accounting, administrative, legal, tax, social, M&A, tourism, wealth, innovation, and legal advice. | Accounting | 🇫🇷 Lyon | 3,533 | 1991 |
| 2 | [Adéquat Interim & Recrutement](https://www.tamtam.ai/c/adequat-interim-and-recrutement) (lejobadequat.com)<br>Provides comprehensive temporary work and recruitment solutions, including permanent contracts and associated services, to various organizations across all sectors in France. | Staffing and Recruiting | 🇫🇷 Lyon | 3,167 | 1987 |
| 3 | [RAS Intérim](https://www.tamtam.ai/c/ras-interim) (ras-interim.fr)<br>Founded in 1969, this French company provides 24/7 staffing solutions nationwide with a highly responsive, flexible, and reliable team for specialized and urgent recruitment needs | Human Resources Services | 🇫🇷 Lyon | 3,048 | 1969 |
| 4 | [entreprise individuelle](https://www.tamtam.ai/c/entreprise-individuelle) (grandclement.fr)<br>This company specializes in web development, SEO, online advertising campaigns, VBNet development, e-commerce, Access development, training, and consulting for SMEs | Software Development | 🇫🇷 Lyon | 2,587 | 2001 |
| 5 | [Boccard](https://www.tamtam.ai/c/boccard) (boccard.com)<br>Designs and builds industrial plants, offering integrated digital expertise in engineering, manufacturing, construction, and maintenance across various global industries. | Industrial Machinery Manufacturing | 🇫🇷 Villeurbanne | 2,390 | 1918 |
| 6 | [Cerema](https://www.tamtam.ai/c/cerema) (cerema.fr)<br>Public referent for territory development, assisting government, communities, and businesses in adapting areas to climate change across six activity domains. | Government Administration | 🇫🇷 Lyon | 2,160 | 2014 |
| 7 | [STS](https://www.tamtam.ai/c/sts-lyon) (sts-certified.com)<br>Technical advisory and conformity assessment services for solar and storage components, including manufacturing audits and inspections for global renewable energy project developers. | Renewables & Environment | 🇫🇷 Lyon | 1,900 | 2010 |
| 8 | [EKIUM](https://www.tamtam.ai/c/ekium) (ekium.eu)<br>Specializing in industrial and building engineering, automation, and partner to various industries, we offer opportunities in national and international offices | Engineering Services | 🇫🇷 Lyon | 1,877 | 1990 |
| 9 | [SOLUTEC](https://www.tamtam.ai/c/solutec) (solutec.fr)<br>Provides IT engineering, consulting, and services. Supports clients through project phases like management, infrastructure, operations, and coordination across various sectors. | IT Services and IT Consulting | 🇫🇷 Villeurbanne | 1,659 | 1991 |
| 10 | [Profil](https://www.tamtam.ai/c/profil) (profil.fr)<br>Specializes in premium hospitality staffing for company receptions, events, and venues, leveraging 25 years of expertise and global support. | Staffing and Recruiting | 🇫🇷 Lyon | 1,652 | 1990 |
| 11 | [CTC](https://www.tamtam.ai/c/ctc-lyon) (ctcgroupe.com)<br>CTC offers cross-disciplinary solutions for the leather, footwear, and textile industries, focusing on ethical practices, cost savings, waste reduction, and performance improvement worldwide | International Trade and Development | 🇫🇷 Lyon | 1,622 | 1899 |
| 12 | [Groupe LIP Interim et Recrutement](https://www.tamtam.ai/c/groupe-lip-interim-et-recrutement) (groupelip.com)<br>Independent group specializing in temporary staffing and recruitment across various sectors, matching skilled professionals with appropriate positions and supporting career paths. | Staffing and Recruiting | 🇫🇷 Lyon | 1,454 | 2005 |
| 13 | [XEFI](https://www.tamtam.ai/c/xefi) (xefi.fr)<br>Provides comprehensive IT services for small and medium businesses, including maintenance, cloud, security, and digitalization, across Europe with over 200 agencies. | IT Services and IT Consulting | 🇫🇷 Rillieux-la-Pape | 1,213 | 1997 |
| 14 | [Domino RH](https://www.tamtam.ai/c/domino-rh) (domino-rh.com)<br>Established in 1999, this group offers temporary assignments, recruitment, training, HR consulting, and management services with a national network across France and expanding internationally | Human Resources Services | 🇫🇷 Lyon | 1,144 | 1999 |
| 15 | [Coexya](https://www.tamtam.ai/c/coexya) (coexya.eu)<br>Offers IT services, specializing in data valuation across customer experience, content, health, legal, location intelligence, and smart data for clients. | IT Services and IT Consulting | 🇫🇷 Saint-Didier-au-Mont-d'Or | 835 |  |
| 16 | [Solerys](https://www.tamtam.ai/c/solerys) (solerys.fr)<br>Solerys is a leading expert in career transition, professional reclassification, and skills assessments with a network of 450 consultants nationwide | Human Resources Services | 🇫🇷 Lyon | 826 | 1993 |
| 17 | [Valority](https://www.tamtam.ai/c/valority) (valority.com)<br>Specialized in real estate, credit, property management, and financial investments, providing comprehensive support throughout the investment process. | Real Estate | 🇫🇷 Lyon | 721 | 1985 |
| 18 | [Groupe Adéquat](https://www.tamtam.ai/c/groupe-adequat) (groupeadequat.com)<br>Private family business providing staffing and recruitment services across multiple sectors and countries, supporting thousands into employment annually. | Human Resources Services | 🇫🇷 Lyon | 668 | 1987 |
| 19 | [Cabinet Merlin](https://www.tamtam.ai/c/cabinet-merlin) (cabinet-merlin.fr)<br>Consulting and engineering services for water production, wastewater treatment, waste management, energy production, urban planning, and mobility for local authorities and industries. | Environmental Services | 🇫🇷 Lyon | 589 | 1922 |
| 20 | [Alteca](https://www.tamtam.ai/c/alteca) (alteca.fr)<br>Supports clients in digital transformation projects, utilizing expertise in dematerialization, mobile applications, IoT, business intelligence, and Big Data. | IT Services and IT Consulting | 🇫🇷 Villeurbanne | 586 | 1996 |
| 21 | [Sully Group](https://www.tamtam.ai/c/sully-group) (sully-group.com)<br>Digital services company with locations in multiple cities, including Lyon, Paris, and Montreal Impressive revenue and staff growth from 2019 to 2022 | IT Services and IT Consulting | 🇫🇷 Saint-Priest | 572 | 1979 |
| 22 | [Oralia](https://www.tamtam.ai/c/oralia) (oralia.fr)<br>Oralia is a group specialized in managing, leasing, and selling real estate properties with extensive knowledge of the market through 24 local offices | Real Estate | 🇫🇷 Lyon | 565 | 1994 |
| 23 | [CONSULTYS](https://www.tamtam.ai/c/consultys) (consultys.com)<br>Provides engineering, production, quality, R&D, and regulatory affairs consulting services to the bio industry for drug development projects. | Pharmaceutical Manufacturing | 🇫🇷 Lyon | 550 | 2005 |
| 24 | [commune](https://www.tamtam.ai/c/commune-lyon) (commune.archi)<br>Specializing in architecture, urban planning, and heritage preservation, the company offers comprehensive services in designing, developing, and conserving built environments | Architecture and Planning | 🇫🇷 Lyon | 539 | 2019 |
| 25 | [Endrix](https://www.tamtam.ai/c/endrix) (endrix.com)<br>Team of 200 professionals supporting over 5000 clients with ISO 9001 certified quality, specialized technology, and expert business performance services. | Business Consulting and Services | 🇫🇷 Lyon | 515 | 1978 |
| 26 | [implid](https://www.tamtam.ai/c/implid) (implid.com)<br>With over 40 years of experience, our team specializes in helping businesses improve organization, regulatory compliance, and system performance across various regions | Business Consulting and Services | 🇫🇷 Lyon | 512 | 1973 |
| 27 | [ING'EUROP](https://www.tamtam.ai/c/ing-europ) (ing-europ.com)<br>Specializes in engineering large industrial projects, managing from project control to assembly coordination, testing, and commissioning processes. | Business Consulting and Services | 🇫🇷 Écully | 501 | 1989 |
| 28 | [Novasep](https://www.tamtam.ai/c/novasep) (novasep.com)<br>Leading provider of molecule production & purification services for life science industries Specializing in small molecule APIs, natural products, purification equipment, and global R&D capabilities | Chemical Manufacturing | 🇫🇷 Lyon | 496 | 1993 |
| 29 | [BYBLOS GROUP](https://www.tamtam.ai/c/byblos-group) (byblos-group-holding.com)<br>Byblos Group specializes in providing tailored security solutions for individuals and businesses, offering a wide range of services including cybersecurity, event security, and training | Security and Investigations | 🇫🇷 Lissieu | 462 | 1999 |
| 30 | [delaware France](https://www.tamtam.ai/c/delaware-france) (delaware.pro)<br>Helps companies with daily IT system use, guiding business transformation, deploying SAP and Microsoft solutions, and providing after-sales service. | IT Services and IT Consulting | 🇫🇷 Villeurbanne | 434 | 2003 |

## 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 the Rhône department

- [The largest companies in the Rhône department](https://www.tamtam.ai/l/largest-companies-rhone) (4,813)
- [Multinational companies in the Rhône department](https://www.tamtam.ai/l/multinational-companies-rhone) (577)
- [Companies with in-house R&D in the Rhône department](https://www.tamtam.ai/l/r-and-d-companies-rhone) (509)
- [Manufacturers in the Rhône department](https://www.tamtam.ai/l/manufacturers-rhone) (322)
- [Retail chains in the Rhône department](https://www.tamtam.ai/l/retail-chains-rhone) (302)
- [IT services companies in the Rhône department](https://www.tamtam.ai/l/it-services-companies-rhone) (286)
- [SaaS companies in the Rhône department](https://www.tamtam.ai/l/saas-companies-rhone) (284)
- [Software Development companies in the Rhône department](https://www.tamtam.ai/l/software-development-companies-rhone) (264)
- [IT Services and IT Consulting companies in the Rhône department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-rhone) (253)
- [Hardware manufacturers in the Rhône department](https://www.tamtam.ai/l/hardware-companies-rhone) (243)
- [Consulting firms in the Rhône department](https://www.tamtam.ai/l/consulting-firms-rhone) (242)
- [Business Consulting and Services companies in the Rhône department](https://www.tamtam.ai/l/business-consulting-and-services-companies-rhone) (219)
- [Distributors and wholesalers in the Rhône department](https://www.tamtam.ai/l/distributors-and-wholesalers-rhone) (185)
- [Higher Education companies in the Rhône department](https://www.tamtam.ai/l/higher-education-companies-rhone) (155)
- [Education providers in the Rhône department](https://www.tamtam.ai/l/education-companies-rhone) (154)
- [Law Practice companies in the Rhône department](https://www.tamtam.ai/l/law-practice-companies-rhone) (152)
- [Real Estate companies in the Rhône department](https://www.tamtam.ai/l/real-estate-companies-rhone) (151)
- [Family-owned companies in the Rhône department](https://www.tamtam.ai/l/family-owned-companies-rhone) (149)
- [Subscription businesses in the Rhône department](https://www.tamtam.ai/l/subscription-businesses-rhone) (149)
- [Construction companies in the Rhône department](https://www.tamtam.ai/l/construction-companies-rhone) (140)
- [Pharmaceutical companies in the Rhône department](https://www.tamtam.ai/l/pharmaceutical-companies-rhone) (134)
- [Financial services firms in the Rhône department](https://www.tamtam.ai/l/financial-services-firms-rhone) (132)
- [Advertising Services companies in the Rhône department](https://www.tamtam.ai/l/advertising-services-companies-rhone) (126)
- [Events Services companies in the Rhône department](https://www.tamtam.ai/l/events-services-companies-rhone) (126)

## The same list elsewhere in France

- [Professional services firms in France](https://www.tamtam.ai/l/professional-services-firms-france) (6,611)
- [Professional services firms in Île-de-France](https://www.tamtam.ai/l/professional-services-firms-ile-de-france) (3,377)
- [Professional services firms in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/professional-services-firms-auvergne-rhone-alpes) (711)
- [Professional services firms in the Hauts-de-Seine department](https://www.tamtam.ai/l/professional-services-firms-hauts-de-seine) (629)
- [Professional services firms in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/professional-services-firms-provence-alpes-cote-dazur) (433)
- [Professional services firms in Occitanie](https://www.tamtam.ai/l/professional-services-firms-occitanie) (399)
- [Professional services firms in Grand Est](https://www.tamtam.ai/l/professional-services-firms-grand-est) (316)
- [Professional services firms in Nouvelle-Aquitaine](https://www.tamtam.ai/l/professional-services-firms-nouvelle-aquitaine) (308)
- [Professional services firms in Hauts-de-France](https://www.tamtam.ai/l/professional-services-firms-hauts-de-france) (260)
- [Professional services firms in Pays de la Loire](https://www.tamtam.ai/l/professional-services-firms-pays-de-la-loire) (254)
- [Professional services firms in the Bouches-du-Rhône department](https://www.tamtam.ai/l/professional-services-firms-bouches-du-rhone) (249)
- [Professional services firms in the Haute-Garonne department](https://www.tamtam.ai/l/professional-services-firms-haute-garonne) (208)
- [Professional services firms in the Nord department](https://www.tamtam.ai/l/professional-services-firms-nord) (178)
- [Professional services firms in Brittany](https://www.tamtam.ai/l/professional-services-firms-brittany) (167)
- [Professional services firms in the Loire-Atlantique department](https://www.tamtam.ai/l/professional-services-firms-loire-atlantique) (158)
- [Professional services firms in the Gironde department](https://www.tamtam.ai/l/professional-services-firms-gironde) (151)
- [Professional services firms in Normandy](https://www.tamtam.ai/l/professional-services-firms-normandy) (114)
- [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108)
- [Professional services firms in the Ille-et-Vilaine department](https://www.tamtam.ai/l/professional-services-firms-ille-et-vilaine) (94)
- [Professional services firms in Paris](https://www.tamtam.ai/l/professional-services-firms-paris) (2,241)
- [Professional services firms in Lyon](https://www.tamtam.ai/l/professional-services-firms-lyon) (265)
- [Professional services firms in Toulouse](https://www.tamtam.ai/l/professional-services-firms-toulouse) (139)
- [Professional services firms in Marseille](https://www.tamtam.ai/l/professional-services-firms-marseille) (123)
- [Professional services firms in Boulogne-Billancourt](https://www.tamtam.ai/l/professional-services-firms-boulogne-billancourt) (102)

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Source: https://www.tamtam.ai/l/professional-services-firms-rhone