# The 30 largest professional services firms in Lyon

Tamtam tracks 265 professional services firms headquartered in Lyon. 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 589. Half of them were founded in 1991 or later.

The professional services sector in Lyon features a mix of well-established firms and younger companies, predominantly focused on human resources and accounting. Adéquat Interim & Recrutement, founded in 1987, provides temporary work and recruitment solutions. RAS Intérim, established in 1969, offers 24/7 staffing services. In Extenso, a 1991 firm, is a French accounting leader. STS, founded in 2010, specializes in technical advisory for solar and storage components.

A notable pattern among these Lyon-based professional services firms is the strong presence of human resources and staffing companies. Several companies, including Adéquat Interim & Recrutement, RAS Intérim, and Groupe LIP Interim et Recrutement, are headquartered in Lyon and specialize in temporary staffing and recruitment. This concentration suggests a significant local ecosystem for workforce solutions.

🇫🇷 Lyon · 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 | [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 |
| 6 | [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 |
| 7 | [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 |
| 8 | [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 |
| 9 | [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 |
| 10 | [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 |
| 11 | [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 |
| 12 | [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 |
| 13 | [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 |
| 14 | [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 |
| 15 | [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 |
| 16 | [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 |
| 17 | [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 |
| 18 | [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 |
| 19 | [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 |
| 20 | [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 |
| 21 | [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 |
| 22 | [Dougs Compta](https://www.tamtam.ai/c/dougs-compta) (dougs.fr)<br>Revolutionizing small business accounting through an innovative web application, providing tools and human support for entrepreneurs to focus on growth. | Accounting | 🇫🇷 Lyon | 420 | 2014 |
| 23 | [Indépendante](https://www.tamtam.ai/c/independante-lyon) (sarah-beaulieu.com)<br>Crafting narratives for diverse media: video games, film, virtual reality, and stage. World-building, script doctoring, and directing actors for interactive and linear storytelling. | Artists and Writers | 🇫🇷 Lyon | 410 |  |
| 24 | [Percall Group](https://www.tamtam.ai/c/percall-group) (percallgroup.com)<br>French IT engineering services company, specializing in CAD, PLM, and IoT software integration for major high-tech industries, a PTC partner. | IT Services and IT Consulting | 🇫🇷 Lyon | 347 | 2000 |
| 25 | [Groupe FUTURMAP](https://www.tamtam.ai/c/groupe-futurmap) (futurmap.com)<br>An innovative company specializing in processing and utilizing geospatial data for LiDAR, photogrammetry, BIM, GIS, web/mobile development, and infographics With 500 employees and two operational sites | Civil Engineering | 🇫🇷 Lyon | 333 | 2014 |
| 26 | [GUARANÍ](https://www.tamtam.ai/c/guarani) (guarani.fr)<br>Provides digital services to over 150 partner companies with expertise, openness, support, and responsibility, fostering individual growth in a healthy environment. | IT Services and IT Consulting | 🇫🇷 Lyon | 303 |  |
| 27 | [ERAS Engineering](https://www.tamtam.ai/c/eras-engineering) (eras.com)<br>Providing high value-added engineering services for medium scale projects in chemicals, food, pharmaceuticals, cosmetics, and energy sectors. | Mechanical Or Industrial Engineering | 🇫🇷 Lyon | 292 | 1991 |
| 28 | [Alixio Mobilité](https://www.tamtam.ai/c/alixio-mobilite) (alixiomobilite.fr)<br>Specializes in professional mobility and career transition support, offering tailored solutions respecting organizational culture and human challenges. | Human Resources Services | 🇫🇷 Lyon | 279 |  |
| 29 | [ABGi France](https://www.tamtam.ai/c/abgi-france) (abgi-france.com)<br>Support clients in structuring, financing, and executing research, development, innovation, operational optimization, technology adoption, and sustainable transformation projects internationally. | Business Consulting and Services | 🇫🇷 Lyon | 261 | 1990 |
| 30 | [APLUSA](https://www.tamtam.ai/c/aplusa) (aplusaresearch.com)<br>A global healthcare market research consultancy specializing in brand performance monitoring, patient journey assessments, and real-world data insights for informed business decisions | Business Consulting and Services | 🇫🇷 Lyon | 246 | 1990 |

## 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 Lyon

- [The largest companies in Lyon](https://www.tamtam.ai/l/largest-companies-lyon) (2,679)
- [Multinational companies in Lyon](https://www.tamtam.ai/l/multinational-companies-lyon) (283)
- [SaaS companies in Lyon](https://www.tamtam.ai/l/saas-companies-lyon) (211)
- [Companies with in-house R&D in Lyon](https://www.tamtam.ai/l/r-and-d-companies-lyon) (192)
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- [Consulting firms in Lyon](https://www.tamtam.ai/l/consulting-firms-lyon) (163)
- [IT Services and IT Consulting companies in Lyon](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-lyon) (160)
- [Retail chains in Lyon](https://www.tamtam.ai/l/retail-chains-lyon) (154)
- [Business Consulting and Services companies in Lyon](https://www.tamtam.ai/l/business-consulting-and-services-companies-lyon) (141)
- [Law Practice companies in Lyon](https://www.tamtam.ai/l/law-practice-companies-lyon) (140)
- [Higher Education companies in Lyon](https://www.tamtam.ai/l/higher-education-companies-lyon) (115)
- [Subscription businesses in Lyon](https://www.tamtam.ai/l/subscription-businesses-lyon) (112)
- [Education providers in Lyon](https://www.tamtam.ai/l/education-companies-lyon) (107)
- [Financial services firms in Lyon](https://www.tamtam.ai/l/financial-services-firms-lyon) (105)
- [Real Estate companies in Lyon](https://www.tamtam.ai/l/real-estate-companies-lyon) (104)
- [Advertising Services companies in Lyon](https://www.tamtam.ai/l/advertising-services-companies-lyon) (99)
- [Recruitment and staffing agencies in Lyon](https://www.tamtam.ai/l/recruitment-agencies-lyon) (88)
- [Marketing and communications agencies in Lyon](https://www.tamtam.ai/l/marketing-agencies-lyon) (78)
- [Companies with a mobile app in Lyon](https://www.tamtam.ai/l/companies-with-mobile-app-lyon) (78)
- [Events Services companies in Lyon](https://www.tamtam.ai/l/events-services-companies-lyon) (72)
- [Professional Training and Coaching companies in Lyon](https://www.tamtam.ai/l/professional-training-and-coaching-companies-lyon) (72)
- [Legal Services companies in Lyon](https://www.tamtam.ai/l/legal-services-companies-lyon) (70)
- [Manufacturers in Lyon](https://www.tamtam.ai/l/manufacturers-lyon) (69)

## 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 the Rhône department](https://www.tamtam.ai/l/professional-services-firms-rhone) (400)
- [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 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-lyon