These companies in Yvelines are primarily large professional services firms, with a notable presence in IT and engineering. SOCOTEC provides services for built assets, LGM offers engineering consulting and complex electronics production, and BTP Consultants focuses on technical control and real estate diagnostics. Konica Minolta Business Solutions France specializes in digital transformation, while AXEO Services provides home and business services.
The data shows a concentration of IT Services and IT Consulting companies, with HexaWare, GROUPE LR TECHNOLOGIES, EOWIN, and act digital EMEA - Alter Solutions all based in Versailles or Guyancourt. This indicates a significant cluster of digital and technology-focused professional services within the department.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
SOCOTECsocotec.fr
Provides services throughout the entire life cycle of built assets for compliance, extended lifespan, improved performance, and people’s safety in construction, infrastructure, and industry. |
7,326 | |||
| 2 | 1,469 | ||||
| 3 |
BTP Consultantsbtp-consultants.fr
Technical control, SPS coordination, and real estate diagnostics, with a focus on R&D, BIM, and off-site modular construction for various project needs. |
1,418 | |||
| 4 |
Konica Minolta Business Solutions Francekonicaminolta.fr
Providing digital transformation solutions including imaging, cloud storage, IT services, and healthcare solutions Specializing in printing, AI technology, and eco-friendly initiatives |
1,148 | |||
| 5 |
AXEO Services - La Poste Groupeaxeoservices.fr
A leading network in France offering a wide range of home and business services, including cleaning, childcare, elderly care, security, and maintenance |
795 | |||
| 6 |
Clemessy Servicesclemessy.com
A leading French provider of industrial services, offering maintenance, engineering, and construction solutions for various industries worldwide |
778 | |||
| 7 |
IVALIS Groupivalisgroup.com
Offers outsourced stocktaking, supply-chain audits, RFID solutions, product identification, geolocation services, and electronic shelf label installations for retail and supply-chain industries internationally. |
775 | |||
| 8 |
Emitech Groupemitech.fr
Provides global testing services for automotive, aeronautic, and defense industries, including environmental, mechanical, EMC, and electrical tests on components, systems, and vehicles. |
510 | |||
| 9 |
HexaWarehexaware.net
HexaWare offers tailored IT solutions and support to ensure continuity of your computer systems and constant access to your data |
487 | |||
| 10 |
Sodicam2 - Renault Groupsodicam2.fr
Recruits, trains, and manages a sales force for automotive parts and accessories, ensuring performance and adaptation to market changes through employee development. |
440 | |||
| 11 |
VITALRESTvitalrest.com
VITALREST is a family-owned company specializing in catering and hotel services for healthcare facilities, focusing on culinary expertise and customer satisfaction Offering various job opportunities nationwide |
428 | |||
| 12 |
GROUPE LR TECHNOLOGIESlrtechnologies.fr
Provides human-centered engineering services, focusing on well-being, CSR, skills development, and recognition across various technology sectors like AI, cybersecurity, and critical software. |
397 | |||
| 13 | 378 | ||||
| 14 |
Egis en Franceegis-group.com
International consulting, construction engineering, and mobility services company. Designs and operates smart infrastructure and buildings addressing climate challenges for balanced and sustainable territorial development. |
349 | |||
| 15 |
act digital EMEA - Alter Solutionsactdigital.com
AI-first multinational technology company providing customized, scalable solutions with local agility and global expertise to create business value. |
284 | |||
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 |
CLF SATREMclf-satrem.com
Design, deploy, maintain innovative fire protection solutions for building, logistics, and industry sectors, ensuring safety and responsibility nationwide. |
256 | |||
| 17 |
Bouygues Construction Expertises Nucléaires
Offers integrated, innovative, high-value solutions globally, covering all technical fields and the complete life cycle of nuclear infrastructure, including engineering, maintenance, and dismantling. |
254 | |||
| 18 |
In &Fi creditsinandfi-credits.fr
Network of banking and payment services intermediaries, providing optimal credit solutions to borrowers and aiming for French market leadership through franchisee recruitment. |
251 | |||
| 19 |
Cegedim Outsourcingcegedim-outsourcing.fr
Specializes in IT and BPO services with strong technological partnerships, providing high-level technical expertise and independent consulting. |
230 | |||
| 20 |
SOCOTEC Formationformation-socotec.fr
Provides operational training in hygiene, health, safety, and QHSE for various industries including nuclear, with digital and onsite solutions. |
230 | |||
| 21 |
TVH Consultingtvhconsulting.fr
An international software company specializing in ERP solutions, systems integration, and industry-specific solutions for various verticals globally |
221 | |||
| 22 |
Médiane Systèmemedianesysteme.com
Specializes in custom secure real-time operating systems, private 5G networks, embedded AI, cybersecurity, and industrial network solutions. |
213 | |||
| 23 |
HOPITAL PRIVE DE L'OUEST PARISIENhopital-prive-de-l-ouest-parisien-trappes.ramsaysante.fr
Multidisciplinary hospital providing high-quality medical-surgical care, established as the largest private Medicine Surgery Obstetrics (MCO) facility in Yvelines. |
202 | |||
| 24 |
STORDATAstordata.fr
Specializing in data management, STORDATA offers consulting, architecture, implementation, and support services, focusing on storage, backup, archiving, and virtualization solutions for clients' success |
177 | |||
| 25 |
LMF, une société de SOCOTEClmf.fr
Specialized training center providing certification for operating various equipment (CACES®) and tailored solutions for specific needs, focusing on safety and hands-on learning with expert trainers |
176 | |||
| 26 |
Euriwareeuriware.fr
A digital services company with 20 years of experience in demanding sectors like energy, industry, and defense, providing consulting, integration, and support services |
136 | |||
| 27 |
GROUPE EMILE DUFOUR SASg-e-d.fr
Engineering company specialized in electrical, electromechanical, and mechanical solutions for industries and businesses Dedicated team offers expertise for project management and process improvement |
136 | |||
| 28 |
Groupe Rouge Vifgrouperougevif.fr
Advises on communication strategies, public and private territorial projects, and organizes events, focusing on human recognition and shared understanding across channels. |
114 | |||
| 29 |
CLINACTmultihealthgroup.com
A leading Contract Research Organisation offering clinical research, biometrics, regulatory affairs, pharmacovigilance, e-tools, outsourcing, and professional training services to healthcare industries |
107 | |||
| 30 |
BETOM Ingénierie (BETOM Group)betom-ingenierie.fr
Providing comprehensive technical engineering services including preliminary studies, design, project monitoring, and future building maintenance anticipation for clients. |
106 | |||
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 Yvelines department
- The largest companies in the Yvelines department 1,469
- Multinational companies in the Yvelines department 226
- Companies with in-house R&D in the Yvelines department 160
- IT services companies in the Yvelines department 121
- IT Services and IT Consulting companies in the Yvelines department 118
- Manufacturers in the Yvelines department 109
- Hardware manufacturers in the Yvelines department 106
- Distributors and wholesalers in the Yvelines department 91
- Retail chains in the Yvelines department 89
- Consulting firms in the Yvelines department 72
- Aerospace and defence companies in the Yvelines department 65
- Public sector organisations in the Yvelines department 65
- Software Development companies in the Yvelines department 56
- Business Consulting and Services companies in the Yvelines department 53
- Government Administration companies in the Yvelines department 51
- Construction companies in the Yvelines department 50
- Automotive manufacturers and suppliers in the Yvelines department 49
- Motor Vehicle Manufacturing companies in the Yvelines department 49
- SaaS companies in the Yvelines department 49
- Education providers in the Yvelines department 46
- Industrial Machinery Manufacturing companies in the Yvelines department 43
- Critical infrastructure operators in the Yvelines department 41
- Family-owned companies in the Yvelines department 36
- Environmental services companies in the Yvelines department 35
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 the Rhône department 400
- 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 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