# Top 30 IT services companies in the Yvelines department
Tamtam tracks 121 IT services companies headquartered in the Yvelines department. This list ranks the 30 largest by number of employees on LinkedIn, led by Crédit Agricole Group Infrastructure Platform, LGM and Konica Minolta Business Solutions France. Their median headcount is 174. Half of them were founded in 2003 or later. The most common headquarters are Versailles (8), Guyancourt (5) and Montigny-le-Bretonneux (5).
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.
🇫🇷 Yvelines · 30 companies · Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Crédit Agricole Group Infrastructure Platform](https://www.tamtam.ai/c/credit-agricole-group-infrastructure-platform) (ca-groupinfrastructureplatform.fr)
Becoming a leading technology hub, developing new digital platforms, ensuring high security and confidentiality, positively impacting 54 million people. | IT Services and IT Consulting | 🇫🇷 Guyancourt | 2,035 | 2019 |
| 2 | [LGM](https://www.tamtam.ai/c/lgm-velizy-villacoublay) (lgm.group)
The company offers technological, digital, and software engineering consulting, innovative solution design, and complex electronics production, supporting critical systems and industrial performance. | Engineering Services | 🇫🇷 Velizy-Villacoublay | 1,469 | 1991 |
| 3 | [Konica Minolta Business Solutions France](https://www.tamtam.ai/c/konica-minolta-business-solutions-france) (konicaminolta.fr)
Providing digital transformation solutions including imaging, cloud storage, IT services, and healthcare solutions Specializing in printing, AI technology, and eco-friendly initiatives | IT Services and IT Consulting | 🇫🇷 Carrières-sur-Seine | 1,148 | 1873 |
| 4 | [HexaWare](https://www.tamtam.ai/c/hexaware) (hexaware.net)
HexaWare offers tailored IT solutions and support to ensure continuity of your computer systems and constant access to your data | IT Services and IT Consulting | 🇫🇷 Versailles | 487 | 2003 |
| 5 | [GROUPE LR TECHNOLOGIES](https://www.tamtam.ai/c/groupe-lr-technologies) (lrtechnologies.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. | IT Services and IT Consulting | 🇫🇷 Versailles | 397 | 2014 |
| 6 | [Saphir Group](https://www.tamtam.ai/c/saphir-group) (quariq.com)
Provides Industry 4.0 solutions, industrial automation, MES/MOM, PLM, data and AI, OT security for manufacturers, from strategy to execution globally. | IT Services and IT Consulting | 🇫🇷 Montigny-le-Bretonneux | 380 | 2024 |
| 7 | [EOWIN](https://www.tamtam.ai/c/eowin) (eowin.com)
A leading content creation and management company with 30 years of experience, serving various industries worldwide in all aspects of information lifecycle | IT Services and IT Consulting | 🇫🇷 Guyancourt | 378 | 1989 |
| 8 | [COLAS DIGITAL SOLUTIONS](https://www.tamtam.ai/c/colas-digital-solutions) (colasdigitalsolutions.com)
Drives global IT and digital transformation projects for construction and transport infrastructure. Manages data centers, applications, IoT, Cloud, Big Data, and AI. | IT Services and IT Consulting | 🇫🇷 Velizy-Villacoublay | 377 | 1929 |
| 9 | [BOUYGUES CONSTRUCTION IT](https://www.tamtam.ai/c/bouygues-construction-it) (bouygues-construction.fr)
Based in Guyancourt, France, provides information technology and services. This company focuses on delivering IT solutions for various needs. | IT Services and IT Consulting | 🇫🇷 Guyancourt | 307 | |
| 10 | [act digital EMEA - Alter Solutions](https://www.tamtam.ai/c/act-digital-emea-alter-solutions) (actdigital.com)
AI-first multinational technology company providing customized, scalable solutions with local agility and global expertise to create business value. | IT Services and IT Consulting | 🇫🇷 Versailles | 284 | 2006 |
| 11 | [Cegedim Outsourcing](https://www.tamtam.ai/c/cegedim-outsourcing) (cegedim-outsourcing.fr)
Specializes in IT and BPO services with strong technological partnerships, providing high-level technical expertise and independent consulting. | IT Services and IT Consulting | 🇫🇷 Velizy-Villacoublay | 230 | |
| 12 | [TVH Consulting](https://www.tamtam.ai/c/tvh-consulting) (tvhconsulting.fr)
An international software company specializing in ERP solutions, systems integration, and industry-specific solutions for various verticals globally | IT Services and IT Consulting | 🇫🇷 Maisons-Laffitte | 221 | 2003 |
| 13 | [Médiane Système](https://www.tamtam.ai/c/mediane-systeme) (medianesysteme.com)
Specializes in custom secure real-time operating systems, private 5G networks, embedded AI, cybersecurity, and industrial network solutions. | Software Development | 🇫🇷 Le Pecq | 213 | 1989 |
| 14 | [STORDATA](https://www.tamtam.ai/c/stordata) (stordata.fr)
Specializing in data management, STORDATA offers consulting, architecture, implementation, and support services, focusing on storage, backup, archiving, and virtualization solutions for clients' success | IT Services and IT Consulting | 🇫🇷 Versailles | 177 | 1988 |
| 15 | [SOFYNE](https://www.tamtam.ai/c/sofyne) (sofynetech.com)
Specialized IT services company in MES/MOM and PLM domains, providing solutions for industry challenges through Industry 40 principles and ISO27001 certification | IT Services and IT Consulting | 🇫🇷 Versailles | 174 | 2005 |
| 16 | [EXPERTIME](https://www.tamtam.ai/c/expertime) (expertime.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 | IT Services and IT Consulting | 🇫🇷 Viroflay | 149 | 2003 |
| 17 | [Digital Product Simulation](https://www.tamtam.ai/c/digital-product-simulation) (dps-fr.com)
Specializes in integrating simulation and analysis into industrial product design, offering consulting, training, and software development services worldwide. | IT Services and IT Consulting | 🇫🇷 La Celle-Saint-Cloud | 149 | 1997 |
| 18 | [Euriware](https://www.tamtam.ai/c/euriware) (euriware.fr)
A digital services company with 20 years of experience in demanding sectors like energy, industry, and defense, providing consulting, integration, and support services | IT Services and IT Consulting | 🇫🇷 Guyancourt | 136 | |
| 19 | [GROUPE ROS DIGITAL](https://www.tamtam.ai/c/groupe-ros-digital) (rosdigital.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 | IT Services and IT Consulting | 🇫🇷 Chatou | 136 | 2001 |
| 20 | [NOVATEL IT Group](https://www.tamtam.ai/c/novatel-it-group) (novatel-it.com)
Provides telecommunications, IT, and engineering services including network deployment, engineering, IT services, and product distribution across MEA region. | IT Services and IT Consulting | 🇫🇷 Montigny-le-Bretonneux | 109 | 2012 |
| 21 | [SQI](https://www.tamtam.ai/c/sqi) (sqi.fr)
Helps companies in project mode, especially in construction, public works, and technical trades, build tailored information systems and offers IT services and partnerships. | Software Development | 🇫🇷 Versailles | 106 | 1990 |
| 22 | [NowBrains](https://www.tamtam.ai/c/nowbrains) (nowbrains.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 | IT Services and IT Consulting | 🇫🇷 Élancourt | 105 | 2003 |
| 23 | [AvenAo Solutions 3D](https://www.tamtam.ai/c/avenao-solutions-3d) (avenao.com)
Certified reseller for Dassault Systèmes SolidWorks in France and Belgium, offering integration, training, support, services, and staff delegation for SolidWorks software | Industrial Machinery Manufacturing | 🇫🇷 Montigny-le-Bretonneux | 92 | 2002 |
| 24 | [CA-SILCA](https://www.tamtam.ai/c/ca-silca)
IT production services for Groupe Crédit Agricole, including infrastructure management, cloud solutions, big data, SOC operations, and user services | IT Services and IT Consulting | 🇫🇷 Guyancourt | 83 | 2005 |
| 25 | [Inibar Services](https://www.tamtam.ai/c/inibar-services) (inibar.com)
Comprehensive support and solutions for evolving Point of Sale and Property Management System needs across various industries and businesses. | IT Services and IT Consulting | 🇫🇷 Montigny-le-Bretonneux | 79 | 2009 |
| 26 | [Tersedia](https://www.tamtam.ai/c/tersedia) (tersedia.fr)
Provider of IT solutions specializing in global infrastructure distribution, storage, business continuity, and virtualized infrastructure, offering expertise and personalized service | IT Services and IT Consulting | 🇫🇷 Chatou | 75 | 1996 |
| 27 | [KBU Conseil - Systèmes d'Information du Secteur Public](https://www.tamtam.ai/c/kbu-conseil-systemes-d-information-du-secteur-public) (kbuconseil.com)
A company founded by an experienced DSI specializing in digital transformation for local public sector, providing pragmatic consulting services to various organizations | IT Services and IT Consulting | 🇫🇷 Versailles | 71 | 2016 |
| 28 | [Ardans](https://www.tamtam.ai/c/ardans) (ardans.fr)
Ardans specializes in knowledge management solutions, offering consulting, training, information systems, and software for organizations across various industries and sectors | Business Consulting and Services | 🇫🇷 Montigny-le-Bretonneux | 69 | 1999 |
| 29 | [VAGANET](https://www.tamtam.ai/c/vaganet) (vaganet.fr)
Pioneering agile delivery company specializing in digital transformation, technical expertise, innovation, and advisory services for IT projects Great Place to Work award winner | IT Services and IT Consulting | 🇫🇷 Velizy-Villacoublay | 69 | 2014 |
| 30 | [Groupe Osmozium](https://www.tamtam.ai/c/groupe-osmozium) (osmozium.com)
Specializes in managing heterogeneous IT infrastructures and delivering tailored outsourcing solutions for large corporate clients with high-quality, reliable services. | IT Services and IT Consulting | 🇫🇷 Versailles | 59 | 2002 |
## 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
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- [Motor Vehicle Manufacturing companies in the Yvelines department](https://www.tamtam.ai/l/motor-vehicle-manufacturing-companies-yvelines) (49)
- [SaaS companies in the Yvelines department](https://www.tamtam.ai/l/saas-companies-yvelines) (49)
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- [Family-owned companies in the Yvelines department](https://www.tamtam.ai/l/family-owned-companies-yvelines) (36)
- [Environmental services companies in the Yvelines department](https://www.tamtam.ai/l/environmental-services-companies-yvelines) (35)
## The same list elsewhere in France
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Source: https://www.tamtam.ai/l/it-services-companies-yvelines