# Managed service providers headquartered in the Yvelines department
Tamtam tracks 25 managed service providers headquartered in the Yvelines department. This list ranks all of them by number of employees on LinkedIn, led by Cr茅dit Agricole Group Infrastructure Platform, HexaWare and Cegedim Outsourcing. Their median headcount is 22. Half of them were founded in 2005 or later. The most common headquarters are Versailles (5), Chatou (3) and Guyancourt (3).
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, Cr茅dit 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.
馃嚝馃嚪 Yvelines 路 25 companies 路 Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Cr茅dit 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 | 馃嚝馃嚪 Guyancourt | 2,035 | 2019 |
| 2 | [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 | 馃嚝馃嚪 Versailles | 487 | 2003 |
| 3 | [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 | 馃嚝馃嚪 Velizy-Villacoublay | 230 | |
| 4 | [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 | 馃嚝馃嚪 Versailles | 177 | 1988 |
| 5 | [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 | 馃嚝馃嚪 Chatou | 136 | 2001 |
| 6 | [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 | 馃嚝馃嚪 Versailles | 106 | 1990 |
| 7 | [CA-SILCA](https://www.tamtam.ai/c/ca-silca)
IT production services for Groupe Cr茅dit Agricole, including infrastructure management, cloud solutions, big data, SOC operations, and user services | IT Services and IT Consulting | 馃嚝馃嚪 Guyancourt | 83 | 2005 |
| 8 | [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 | 馃嚝馃嚪 Chatou | 75 | 1996 |
| 9 | [COSIUM](https://www.tamtam.ai/c/cosium) (cosium.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 | Software Development | 馃嚝馃嚪 Versailles | 65 | 2003 |
| 10 | [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 | 馃嚝馃嚪 Versailles | 59 | 2002 |
| 11 | [NowTeam](https://www.tamtam.ai/c/nowteam) (nowteam.net)
National IT service partner for SMEs, offering solutions such as IT management, hosting, and system integration to free businesses from IT constraints | IT Services and IT Consulting | 馃嚝馃嚪 脡lancourt | 54 | 2003 |
| 12 | [MTI France SAS](https://www.tamtam.ai/c/mti-france-sas) (fr.mti.com)
Provides tailored IT solutions and services in datacentre, security, and managed services with global experience and industry best practices. | IT Services and IT Consulting | 馃嚝馃嚪 Croissy-sur-Seine | 35 | 1988 |
| 13 | [ALEZ PC PRESTATAIRE INFORMATIQUE](https://www.tamtam.ai/c/alez-pc-prestataire-informatique) (alezpc.com)
Provides IT infrastructure maintenance, security solutions, server management, data protection, compliance, and personalized IT training for businesses. | Computer and Network Security | 馃嚝馃嚪 Croissy-sur-Seine | 22 | 2005 |
| 14 | [NUMLOG](https://www.tamtam.ai/c/numlog) (numlog.fr)
A company providing technical solutions and services nationwide and internationally, specializing in data exchanges, network interconnections, telecommunications, and hosting with a focus on optimization, performance, and reliability | Telecommunications | 馃嚝馃嚪 Villiers-Saint-Fr茅deric | 22 | 1993 |
| 15 | [ADITUS Technologies](https://www.tamtam.ai/c/aditus-technologies) (aditus-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 | IT Services and IT Consulting | 馃嚝馃嚪 Poissy | 21 | 2011 |
| 16 | [Th茅s茅e Datacenter](https://www.tamtam.ai/c/thesee-datacenter) (thesee-datacenter.fr)
A French colocation data center company in Paris offering Tier IV Facilities certified infrastructure with unmatched security and efficiency | IT Services and IT Consulting | 馃嚝馃嚪 Aubergenville | 20 | 2016 |
| 17 | [NET POINT](https://www.tamtam.ai/c/net-point) (netpoint.fr)
Aggregation of SaaS, IaaS, and PaaS solutions from multiple vendors through a cloud marketplace platform named Provicloud. | Software Development | 馃嚝馃嚪 Croissy-sur-Seine | 17 | 2011 |
| 18 | [NEOFUTUR](https://www.tamtam.ai/c/neofutur) (neofutur.com)
Provides IT services including management, security, auditing, consulting, and infrastructure development for businesses, associations, and educational institutions. | IT Services and IT Consulting | 馃嚝馃嚪 Saint-Germain-en-Laye | 16 | 1999 |
| 19 | [ALATYR](https://www.tamtam.ai/c/alatyr) (alatyr.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. | Space Research and Technology | 馃嚝馃嚪 Saint-Germain-en-Laye | 16 | 2023 |
| 20 | [Insyncom](https://www.tamtam.ai/c/insyncom) (insyncom.fr)
Insyncom specializes in IT security and infrastructure, offering managed cloud solutions and technical support for clients undergoing digital transformation | Computer and Network Security | 馃嚝馃嚪 Le Pecq | 15 | 2014 |
| 21 | [DigDeo](https://www.tamtam.ai/c/digdeo) (digdeo.fr)
Innovative company providing secure, multi-platform virtualization solutions with DevSecOps practices and expertise in outsourcing services for various industries | IT Services and IT Consulting | 馃嚝馃嚪 Chatou | 12 | 2010 |
| 22 | [EVERDATA](https://www.tamtam.ai/c/everdata) (everdata.fr)
A leading operator in sovereign hybrid cloud solutions, offering expert IT infrastructure services, value-added consultations, and innovative hybrid cloud solutions for SMBs | IT Services and IT Consulting | 馃嚝馃嚪 Montigny-le-Bretonneux | 11 | 2014 |
| 23 | [RedSol : Connecting Your Business](https://www.tamtam.ai/c/redsol-connecting-your-business) (redsol.fr)
Global integration and data management company offering solutions to securely integrate, transform, harmonize, manage, and secure business data across various industries worldwide | IT Services and IT Consulting | 馃嚝馃嚪 Poissy | 10 | 2010 |
| 24 | [Oxibox](https://www.tamtam.ai/c/oxibox) (oxibox.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 | Computer and Network Security | 馃嚝馃嚪 Guyancourt | 10 | 2016 |
| 25 | [Bull Nederland](https://www.tamtam.ai/c/bull-nederland) (atos.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 | IT Services and IT Consulting | 馃嚝馃嚪 Les Clayes-sous-Bois | 6 | 1948 |
## 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](https://www.tamtam.ai/l/largest-companies-yvelines) (1,469)
- [Multinational companies in the Yvelines department](https://www.tamtam.ai/l/multinational-companies-yvelines) (226)
- [Companies with in-house R&D in the Yvelines department](https://www.tamtam.ai/l/r-and-d-companies-yvelines) (160)
- [IT services companies in the Yvelines department](https://www.tamtam.ai/l/it-services-companies-yvelines) (121)
- [IT Services and IT Consulting companies in the Yvelines department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-yvelines) (118)
- [Manufacturers in the Yvelines department](https://www.tamtam.ai/l/manufacturers-yvelines) (109)
- [Professional services firms in the Yvelines department](https://www.tamtam.ai/l/professional-services-firms-yvelines) (108)
- [Hardware manufacturers in the Yvelines department](https://www.tamtam.ai/l/hardware-companies-yvelines) (106)
- [Distributors and wholesalers in the Yvelines department](https://www.tamtam.ai/l/distributors-and-wholesalers-yvelines) (91)
- [Retail chains in the Yvelines department](https://www.tamtam.ai/l/retail-chains-yvelines) (89)
- [Consulting firms in the Yvelines department](https://www.tamtam.ai/l/consulting-firms-yvelines) (72)
- [Aerospace and defence companies in the Yvelines department](https://www.tamtam.ai/l/aerospace-and-defense-companies-yvelines) (65)
- [Public sector organisations in the Yvelines department](https://www.tamtam.ai/l/public-sector-organisations-yvelines) (65)
- [Software Development companies in the Yvelines department](https://www.tamtam.ai/l/software-development-companies-yvelines) (56)
- [Business Consulting and Services companies in the Yvelines department](https://www.tamtam.ai/l/business-consulting-and-services-companies-yvelines) (53)
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- [Construction companies in the Yvelines department](https://www.tamtam.ai/l/construction-companies-yvelines) (50)
- [Automotive manufacturers and suppliers in the Yvelines department](https://www.tamtam.ai/l/automotive-companies-yvelines) (49)
- [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)
- [Education providers in the Yvelines department](https://www.tamtam.ai/l/education-companies-yvelines) (46)
- [Industrial Machinery Manufacturing companies in the Yvelines department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-yvelines) (43)
- [Critical infrastructure operators in the Yvelines department](https://www.tamtam.ai/l/critical-infrastructure-operators-yvelines) (41)
- [Family-owned companies in the Yvelines department](https://www.tamtam.ai/l/family-owned-companies-yvelines) (36)
## The same list elsewhere in France
- [Managed service providers in France](https://www.tamtam.ai/l/managed-service-providers-france) (749)
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- [Managed service providers in Grand Est](https://www.tamtam.ai/l/managed-service-providers-grand-est) (46)
- [Managed service providers in the Rh么ne department](https://www.tamtam.ai/l/managed-service-providers-rhone) (45)
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- [Managed service providers in Provence-Alpes-C么te d'Azur](https://www.tamtam.ai/l/managed-service-providers-provence-alpes-cote-dazur) (32)
- [Managed service providers in the Nord department](https://www.tamtam.ai/l/managed-service-providers-nord) (26)
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Source: https://www.tamtam.ai/l/managed-service-providers-yvelines