The Yvelines department hosts a concentration of IT services and consulting firms, ranging from large corporate IT divisions to mid-sized specialized companies. These firms primarily focus on digital transformation, data management, and engineering solutions for various industries. Many of them support critical systems and industrial performance, with a strong emphasis on emerging technologies like AI and cybersecurity.
Among the companies listed, Crédit Agricole Group Infrastructure Platform develops digital platforms and ensures security for 54 million people. LGM provides technological and software engineering consulting. Konica Minolta Business Solutions France offers digital transformation solutions including imaging and cloud storage. HexaWare provides tailored IT solutions and support for computer systems. A notable pattern is the clustering of headquarters in Versailles, Guyancourt, and Vélizy-Villacoublay.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Crédit Agricole Group Infrastructure Platformca-groupinfrastructureplatform.fr
Becoming a leading technology hub, developing new digital platforms, ensuring high security and confidentiality, positively impacting 54 million people. |
2,035 | |||
| 2 | 1,469 | ||||
| 3 |
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 | |||
| 4 |
HexaWarehexaware.net
HexaWare offers tailored IT solutions and support to ensure continuity of your computer systems and constant access to your data |
487 | |||
| 5 |
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 | |||
| 6 |
Saphir Groupquariq.com
Provides Industry 4.0 solutions, industrial automation, MES/MOM, PLM, data and AI, OT security for manufacturers, from strategy to execution globally. |
380 | |||
| 7 | 378 | ||||
| 8 |
COLAS DIGITAL SOLUTIONScolasdigitalsolutions.com
Drives global IT and digital transformation projects for construction and transport infrastructure. Manages data centers, applications, IoT, Cloud, Big Data, and AI. |
377 | |||
| 9 |
BOUYGUES CONSTRUCTION ITbouygues-construction.fr
Based in Guyancourt, France, provides information technology and services. This company focuses on delivering IT solutions for various needs. |
307 | |||
| 10 |
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 | |||
| 11 |
Cegedim Outsourcingcegedim-outsourcing.fr
Specializes in IT and BPO services with strong technological partnerships, providing high-level technical expertise and independent consulting. |
230 | |||
| 12 |
TVH Consultingtvhconsulting.fr
An international software company specializing in ERP solutions, systems integration, and industry-specific solutions for various verticals globally |
221 | |||
| 13 |
Médiane Systèmemedianesysteme.com
Specializes in custom secure real-time operating systems, private 5G networks, embedded AI, cybersecurity, and industrial network solutions. |
213 | |||
| 14 |
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 | |||
| 15 |
SOFYNEsofynetech.com
Specialized IT services company in MES/MOM and PLM domains, providing solutions for industry challenges through Industry 40 principles and ISO27001 certification |
174 | |||
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 |
EXPERTIMEexpertime.com
Digital performance partner focusing on user experience, offering expertise in collaborative tools, e-commerce, BI, digital communication, and more Specializing in strategy, design, and development services |
149 | |||
| 17 |
Digital Product Simulationdps-fr.com
Specializes in integrating simulation and analysis into industrial product design, offering consulting, training, and software development services worldwide. |
149 | |||
| 18 |
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 | |||
| 19 |
GROUPE ROS DIGITALrosdigital.fr
A comprehensive group offering printing solutions, IT services, cloud storage, telecom solutions, communication products, and LED lighting expertise with dedicated specialists in each field |
136 | |||
| 20 |
NOVATEL IT Groupnovatel-it.com
Provides telecommunications, IT, and engineering services including network deployment, engineering, IT services, and product distribution across MEA region. |
109 | |||
| 21 | 106 | ||||
| 22 |
NowBrainsnowbrains.com
Specializing in digital transformation and IT expertise for small and medium-sized enterprises, offering services in IT infrastructure, cybersecurity, digital strategy, and more Helping businesses accelerate their potential |
105 | |||
| 23 |
AvenAo Solutions 3Davenao.com
Certified reseller for Dassault Systèmes SolidWorks in France and Belgium, offering integration, training, support, services, and staff delegation for SolidWorks software |
92 | |||
| 24 |
CA-SILCA
IT production services for Groupe Crédit Agricole, including infrastructure management, cloud solutions, big data, SOC operations, and user services |
83 | |||
| 25 |
Inibar Servicesinibar.com
Comprehensive support and solutions for evolving Point of Sale and Property Management System needs across various industries and businesses. |
79 | |||
| 26 |
Tersediatersedia.fr
Provider of IT solutions specializing in global infrastructure distribution, storage, business continuity, and virtualized infrastructure, offering expertise and personalized service |
75 | |||
| 27 | 
KBU Conseil - Systèmes d'Information du Secteur Publickbuconseil.com
A company founded by an experienced DSI specializing in digital transformation for local public sector, providing pragmatic consulting services to various organizations |
71 | |||
| 28 | 69 | ||||
| 29 |
VAGANETvaganet.fr
Pioneering agile delivery company specializing in digital transformation, technical expertise, innovation, and advisory services for IT projects Great Place to Work award winner |
69 | |||
| 30 |
Groupe Osmoziumosmozium.com
Specializes in managing heterogeneous IT infrastructures and delivering tailored outsourcing solutions for large corporate clients with high-quality, reliable services. |
59 | |||
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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 and IT Consulting companies in the Yvelines department 118
- Manufacturers in the Yvelines department 109
- Professional services firms in the Yvelines department 108
- 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
- IT services companies in France 5,000
- IT services companies in Île-de-France 2,624
- IT services companies in the Hauts-de-Seine department 737
- IT services companies in Auvergne-Rhône-Alpes 519
- IT services companies in the Rhône department 286
- IT services companies in Occitanie 280
- IT services companies in Provence-Alpes-Côte d'Azur 268
- IT services companies in Grand Est 248
- IT services companies in Hauts-de-France 236
- IT services companies in Pays de la Loire 205
- IT services companies in Nouvelle-Aquitaine 194
- IT services companies in the Nord department 170
- IT services companies in the Haute-Garonne department 158
- IT services companies in the Bouches-du-Rhône department 155
- IT services companies in the Loire-Atlantique department 130
- IT services companies in Brittany 113
- IT services companies in the Val-de-Marne department 101
- IT services companies in the Gironde department 99
- IT services companies in Paris 1,386
- IT services companies in Lyon 171
- IT services companies in Boulogne-Billancourt 125
- IT services companies in Toulouse 119
- IT services companies in Levallois-Perret 94
- IT services companies in Neuilly-sur-Seine 87