Tamtam Start free

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.

🇫🇷 Lyon30 companiesUpdated Nov 11, 2026

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.

#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
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
6
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
7
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
8
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
9
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
10
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
11
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
12
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
13
Valorityvalority.com

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

Real Estate 🇫🇷 Lyon 721 1985
14
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
15
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

Want more companies than this list?

This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers.

Get more companies, free
16
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
17
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
18
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
19
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
20
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
21
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
22
Dougs Comptadougs.fr

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
Indépendantesarah-beaulieu.com

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 n/a
24
Percall Grouppercallgroup.com

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 FUTURMAPfuturmap.com

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
GUARANÍguarani.fr

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 n/a
27
ERAS Engineeringeras.com

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 Mobilitéalixiomobilite.fr

Specializes in professional mobility and career transition support, offering tailored solutions respecting organizational culture and human challenges.

Human Resources Services 🇫🇷 Lyon 279 n/a
29
ABGi Franceabgi-france.com

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
APLUSAaplusaresearch.com

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

Turn this list into pipeline

Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.

Build your own list, free

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 same list elsewhere in France