These companies are managed service providers in the Yvelines department, primarily focused on IT services and IT consulting. The list features a mix of large groups and mid-sized firms, with a strong emphasis on IT infrastructure, data management, and digital solutions. For instance, Crédit Agricole Group Infrastructure Platform develops digital platforms, while HexaWare offers tailored IT solutions and support. STORDATA specializes in data management, and GROUPE ROS DIGITAL provides comprehensive IT and printing solutions.
A significant concentration of these companies is headquartered in Versailles, indicating a geographic cluster for IT service providers in the region. Many of these firms were founded in the early 2000s, suggesting a period of growth and establishment for managed IT services in the Yvelines department.
| # | 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 |
HexaWarehexaware.net
HexaWare offers tailored IT solutions and support to ensure continuity of your computer systems and constant access to your data |
487 | |||
| 3 |
Cegedim Outsourcingcegedim-outsourcing.fr
Specializes in IT and BPO services with strong technological partnerships, providing high-level technical expertise and independent consulting. |
230 | |||
| 4 |
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 | |||
| 5 |
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 | |||
| 6 | 106 | ||||
| 7 |
CA-SILCA
IT production services for Groupe Crédit Agricole, including infrastructure management, cloud solutions, big data, SOC operations, and user services |
83 | |||
| 8 |
Tersediatersedia.fr
Provider of IT solutions specializing in global infrastructure distribution, storage, business continuity, and virtualized infrastructure, offering expertise and personalized service |
75 | |||
| 9 |
COSIUMcosium.com
Cloud-based software and hardware solutions for healthcare industry, offering ICT outsourcing, Business Intelligence tools, and custom-designed electronics for optical retail and domiciliary care |
65 | |||
| 10 |
Groupe Osmoziumosmozium.com
Specializes in managing heterogeneous IT infrastructures and delivering tailored outsourcing solutions for large corporate clients with high-quality, reliable services. |
59 | |||
| 11 |
NowTeamnowteam.net
National IT service partner for SMEs, offering solutions such as IT management, hosting, and system integration to free businesses from IT constraints |
54 | |||
| 12 |
MTI France SASfr.mti.com
Provides tailored IT solutions and services in datacentre, security, and managed services with global experience and industry best practices. |
35 | |||
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| 13 |
ALEZ PC PRESTATAIRE INFORMATIQUEalezpc.com
Provides IT infrastructure maintenance, security solutions, server management, data protection, compliance, and personalized IT training for businesses. |
22 | |||
| 14 | 22 | ||||
| 15 |
ADITUS Technologiesaditus-technologies.fr
ADITUS Technologies is a Digital Service Company specializing in new technologies, assisting clients in innovation cycles with expertise in engineering and managed services |
21 | |||
| 16 |
Thésée Datacenterthesee-datacenter.fr
A French colocation data center company in Paris offering Tier IV Facilities certified infrastructure with unmatched security and efficiency |
20 | |||
| 17 |
NET POINTnetpoint.fr
Aggregation of SaaS, IaaS, and PaaS solutions from multiple vendors through a cloud marketplace platform named Provicloud. |
17 | |||
| 18 |
NEOFUTURneofutur.com
Provides IT services including management, security, auditing, consulting, and infrastructure development for businesses, associations, and educational institutions. |
16 | |||
| 19 |
ALATYRalatyr.space
Developing robotically assembled orbital data centers, megawatt-scale compute hubs in space with microsecond internal latency, ensuring guaranteed service continuity for mission-critical systems and powering global intelligence. |
16 | |||
| 20 |
Insyncominsyncom.fr
Insyncom specializes in IT security and infrastructure, offering managed cloud solutions and technical support for clients undergoing digital transformation |
15 | |||
| 21 | 12 | ||||
| 22 |
EVERDATAeverdata.fr
A leading operator in sovereign hybrid cloud solutions, offering expert IT infrastructure services, value-added consultations, and innovative hybrid cloud solutions for SMBs |
11 | |||
| 23 |
RedSol : Connecting Your Businessredsol.fr
Global integration and data management company offering solutions to securely integrate, transform, harmonize, manage, and secure business data across various industries worldwide |
10 | |||
| 24 |
Oxiboxoxibox.com
A plug-and-protect cyber-resilience solution that guarantees recovery after any disaster by automating data classification, isolation of backups from production network, and utilizing artificial intelligence |
10 | |||
| 25 |
Bull Nederlandatos.net
A leading provider of secure IT systems, focusing on high-quality solutions for efficient business operations in sectors like retail, manufacturing, government, and finance |
6 | |||
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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.
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- Government Administration companies in the Yvelines department 51
- Construction companies in the Yvelines department 50
- Automotive manufacturers and suppliers in the Yvelines department 49
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- Family-owned companies in the Yvelines department 36
The same list elsewhere in France
- Managed service providers in France 749
- Managed service providers in Île-de-France 322
- Managed service providers in the Hauts-de-Seine department 122
- Managed service providers in Auvergne-Rhône-Alpes 89
- Managed service providers in Occitanie 49
- Managed service providers in Pays de la Loire 47
- Managed service providers in Grand Est 46
- Managed service providers in the Rhône department 45
- Managed service providers in Hauts-de-France 42
- Managed service providers in Nouvelle-Aquitaine 33
- Managed service providers in Provence-Alpes-Côte d'Azur 32
- Managed service providers in the Nord department 26
- Managed service providers in Paris 123