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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).

🇫🇷 Rhône30 companiesUpdated Nov 11, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
1
In Extensoinextenso.fr

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 & Recrutementlejobadequat.com

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 Intérimras-interim.fr

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 individuellegrandclement.fr

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
Boccardboccard.com

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
Ceremacerema.fr

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
STSsts-certified.com

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
EKIUMekium.eu

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
SOLUTECsolutec.fr

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
Profilprofil.fr

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
CTCctcgroupe.com

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 Recrutementgroupelip.com

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
XEFIxefi.fr

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 RHdomino-rh.com

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
Coexyacoexya.eu

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 n/a

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16
Soleryssolerys.fr

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
Valorityvalority.com

Specialized in real estate, credit, property management, and financial investments, providing comprehensive support throughout the investment process.

Real Estate 🇫🇷 Lyon 721 1985
18
Groupe Adéquatgroupeadequat.com

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 Merlincabinet-merlin.fr

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
Altecaalteca.fr

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 Groupsully-group.com

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
Oraliaoralia.fr

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
CONSULTYSconsultys.com

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
communecommune.archi

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
Endrixendrix.com

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
implidimplid.com

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'EUROPing-europ.com

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
Novasepnovasep.com

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 GROUPbyblos-group-holding.com

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 Francedelaware.pro

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

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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 11, 2026.

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