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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 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. |
3,533 | |||
| 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. |
3,167 | |||
| 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 |
3,048 | |||
| 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 |
2,587 | |||
| 5 |
Boccardboccard.com
Designs and builds industrial plants, offering integrated digital expertise in engineering, manufacturing, construction, and maintenance across various global industries. |
2,390 | |||
| 6 | 2,160 | ||||
| 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. |
1,900 | |||
| 8 | 1,877 | ||||
| 9 |
SOLUTECsolutec.fr
Provides IT engineering, consulting, and services. Supports clients through project phases like management, infrastructure, operations, and coordination across various sectors. |
1,659 | |||
| 10 | 1,652 | ||||
| 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 |
1,622 | |||
| 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. |
1,454 | |||
| 13 | 1,213 | ||||
| 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 |
1,144 | |||
| 15 | 835 | ||||
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. | |||||
| 16 |
Soleryssolerys.fr
Solerys is a leading expert in career transition, professional reclassification, and skills assessments with a network of 450 consultants nationwide |
826 | |||
| 17 |
Valorityvalority.com
Specialized in real estate, credit, property management, and financial investments, providing comprehensive support throughout the investment process. |
721 | |||
| 18 |
Groupe Adéquatgroupeadequat.com
Private family business providing staffing and recruitment services across multiple sectors and countries, supporting thousands into employment annually. |
668 | |||
| 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. |
589 | |||
| 20 | 586 | ||||
| 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 |
572 | |||
| 22 | 565 | ||||
| 23 |
CONSULTYSconsultys.com
Provides engineering, production, quality, R&D, and regulatory affairs consulting services to the bio industry for drug development projects. |
550 | |||
| 24 |
communecommune.archi
Specializing in architecture, urban planning, and heritage preservation, the company offers comprehensive services in designing, developing, and conserving built environments |
539 | |||
| 25 |
Endrixendrix.com
Team of 200 professionals supporting over 5000 clients with ISO 9001 certified quality, specialized technology, and expert business performance services. |
515 | |||
| 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 |
512 | |||
| 27 |
ING'EUROPing-europ.com
Specializes in engineering large industrial projects, managing from project control to assembly coordination, testing, and commissioning processes. |
501 | |||
| 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 |
496 | |||
| 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 |
462 | |||
| 30 |
delaware Francedelaware.pro
Helps companies with daily IT system use, guiding business transformation, deploying SAP and Microsoft solutions, and providing after-sales service. |
434 | |||
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.
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 4,813
- Multinational companies in the Rhône department 577
- Companies with in-house R&D in the Rhône department 509
- Manufacturers in the Rhône department 322
- Retail chains in the Rhône department 302
- IT services companies in the Rhône department 286
- SaaS companies in the Rhône department 284
- Software Development companies in the Rhône department 264
- IT Services and IT Consulting companies in the Rhône department 253
- Hardware manufacturers in the Rhône department 243
- Consulting firms in the Rhône department 242
- Business Consulting and Services companies in the Rhône department 219
- Distributors and wholesalers in the Rhône department 185
- Higher Education companies in the Rhône department 155
- Education providers in the Rhône department 154
- Law Practice companies in the Rhône department 152
- Real Estate companies in the Rhône department 151
- Family-owned companies in the Rhône department 149
- Subscription businesses in the Rhône department 149
- Construction companies in the Rhône department 140
- Pharmaceutical companies in the Rhône department 134
- Financial services firms in the Rhône department 132
- Advertising Services companies in the Rhône department 126
- Events Services companies in the Rhône department 126
The same list elsewhere in France
- Professional services firms in France 6,611
- Professional services firms in Île-de-France 3,377
- Professional services firms in Auvergne-Rhône-Alpes 711
- Professional services firms in the Hauts-de-Seine department 629
- Professional services firms in Provence-Alpes-Côte d'Azur 433
- Professional services firms in Occitanie 399
- Professional services firms in Grand Est 316
- Professional services firms in Nouvelle-Aquitaine 308
- Professional services firms in Hauts-de-France 260
- Professional services firms in Pays de la Loire 254
- Professional services firms in the Bouches-du-Rhône department 249
- Professional services firms in the Haute-Garonne department 208
- Professional services firms in the Nord department 178
- Professional services firms in Brittany 167
- Professional services firms in the Loire-Atlantique department 158
- Professional services firms in the Gironde department 151
- Professional services firms in Normandy 114
- Professional services firms in the Yvelines department 108
- Professional services firms in the Ille-et-Vilaine department 94
- Professional services firms in Paris 2,241
- Professional services firms in Lyon 265
- Professional services firms in Toulouse 139
- Professional services firms in Marseille 123
- Professional services firms in Boulogne-Billancourt 102