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Top 30 managed service providers in the Hauts-de-Seine department

Tamtam tracks 122 managed service providers headquartered in the Hauts-de-Seine department. This list ranks the 30 largest by number of employees on LinkedIn, led by Orange, Econocom and Axians. Their median headcount is 547. Half of them were founded in 1999 or later. The most common headquarters are Puteaux (5), Boulogne-Billancourt (4) and Issy-les-Moulineaux (4).

🇫🇷 Hauts-de-Seine30 companiesUpdated Nov 11, 2026

This selection of managed service providers in Hauts-de-Seine consists mainly of large and mid-sized companies specialized in IT services and telecommunications. Key players include Orange, a global telecommunications operator; Econocom, which provides IT equipment and managed services; Axians, offering ICT solutions in cybersecurity and cloud services; and Cegedim, focused on digital data flow management in healthcare.

The companies are concentrated in several cities across the department, notably Nanterre, Issy-les-Moulineaux, and Boulogne-Billancourt, suggesting a geographical cluster for these types of services. Many of these firms were founded between the 1970s and early 2000s, indicating a mature sector.

#CompanyIndustryHeadquarters EmployeesFounded
1
Orangeorange.com

A leading global telecommunications operator offering services to millions of customers and multinational companies across 26 countries

Telecommunications 🇫🇷 Issy-les-Moulineaux 146,935 n/a
2
Econocomeconocom.com

Supplies, finances, and provides managed services for workplace, audiovisual, and infrastructures, supporting businesses in their digital transformation with equipment and support.

IT Services and IT Consulting 🇫🇷 Puteaux 7,123 1973
3
Axiansaxians.com

A technology company supporting digital transformation by providing ICT solutions in cybersecurity, telecommunication, data analytics, cloud services, and more

IT Services and IT Consulting 🇫🇷 Nanterre 4,186 n/a
4
Cegedimcegedim.com

Technology and services for digital data flow management in healthcare ecosystems and B2B, plus business software publishing for healthcare and insurance professionals.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 4,103 1969
5
SPIE ICSspie.fr

Supports digital transformation for businesses with ICT solutions, providing expertise in IT infrastructure, cloud, cybersecurity, and data & IoT for enhanced performance and user well-being.

IT Services and IT Consulting 🇫🇷 Malakoff 2,930 2001
6
TDFtdf.fr

In the heart of the digital revolution, this company develops innovative solutions for managing and distributing audio, video, and data content through various transmission methods

Telecommunications 🇫🇷 Montrouge 1,741 1975
7
SCC Francescc.com

Provides comprehensive IT solutions, including cybersecurity, digital workplace, and hybrid infrastructure, enabling businesses to optimize operations and achieve their goals.

IT Services and IT Consulting 🇫🇷 Nanterre 1,422 1975
8
IGAiga.fr

Develops software components, creates custom solutions, implements installations, and provides specific services like hosting and accounting outsourcing for insurance, travel, and trade.

Software Development 🇫🇷 Malakoff 1,358 1985
9
NXO Francenxo.eu

Independent leader in French Telecom integration, undertaking complex projects, anticipating customer needs, attracting talent, and focusing on well-done work.

IT Services and IT Consulting 🇫🇷 Puteaux 1,200 n/a
10
Axians Franceaxians.fr

Supports clients with digital infrastructure and solutions, covering applications, data, networks, cloud, telecom, and cybersecurity through consulting, design, integration, and services.

IT Services and IT Consulting 🇫🇷 Nanterre 1,137 1999
11
CDC Informatiqueicdc.caissedesdepots.fr

Provides IT solutions, guarantees security and integrity for public sector clients. Technological competence and innovation are key, anticipating and supporting digital changes.

IT Services and IT Consulting 🇫🇷 Bagneux 1,049 1959
12
Nomios Groupnomios.com

Designs, secures, and manages digital infrastructures, developing innovative cybersecurity and networking solutions through consulting, managed, and professional services for organizations.

Computer and Network Security 🇫🇷 Boulogne-Billancourt 887 2004
13
oXyaoxya.com

Leading provider of SAP technical services, cloud solutions, and hosting for midsize and global organizations, enhancing efficiency and flexibility of SAP infrastructure worldwide

IT Services and IT Consulting 🇫🇷 Issy-les-Moulineaux 586 n/a
14
Devoteam | Google Cloud Partnergcloud.devoteam.com

Provides innovative Google Cloud solutions across AI, IT modernization, security, and work transformation, with expertise in migrating users and assisting organizations.

IT Services and IT Consulting 🇫🇷 Levallois-Perret 579 n/a
15
Globecastglobecast.com

Leading broadcast, media & entertainment managed services platform specializing in cloud migration, advanced hybrid cloud solutions, live TV channel distribution, and content monetization

Broadcast Media Production and Distribution 🇫🇷 Issy-les-Moulineaux 547 n/a

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16
AMEXIOamexiogroup.com

Digital transformation partner specializing in Enterprise Content Management, Customer Communication Management, and Customer Experience Management, prioritizing human excellence for successful outcomes

IT Services and IT Consulting 🇫🇷 Neuilly-sur-Seine 477 2006
17
Linktlinkt.fr

Provides managed services, telecom, and cybersecurity expertise for mid-sized and large companies, and local authorities, to optimize and secure their digital infrastructure.

Telecommunications 🇫🇷 Puteaux 463 2016
18
METSYSmetsys.fr

Advises clients on cybersecurity, infrastructure, and cloud solution design and implementation. Over 500 employees across France, 93.2M  in revenue.

IT Services and IT Consulting 🇫🇷 Boulogne-Billancourt 435 2011
19
Almondalmond.eu

Formed from NetXP and Provadys, positioned as a major independent French player in audit and consulting for Cybersecurity, Cloud, and Infrastructure.

IT Services and IT Consulting 🇫🇷 Sèvres 424 2006
20
Devoteam | Microsoft Partnerdevoteam.com

Premium Microsoft cloud consulting and managed services with expertise in cloud, cybersecurity, data, and sustainable digital transformation across EMEA.

IT Services and IT Consulting 🇫🇷 Levallois-Perret 413 n/a
21
OUTSCALEoutscale.com

Sovereign cloud operator providing virtual twin solutions for data control, cyber governance, and sustainable infrastructure optimization for organizations.

IT Services and IT Consulting 🇫🇷 Saint-Cloud 355 2010
22
Keyyokeyyo.com

Innovative communication solutions with VoIP for businesses, managed through the Cloud Trusted by over 10,000 clients in various industries

Telecommunications 🇫🇷 Clichy 337 1994
23
Cloud Templecloud-temple.com

Provides IT transformation, hosting, and outsourcing for critical business applications. Guides customers from conception to maintenance across various IT verticals, specializing in private cloud.

IT Services and IT Consulting 🇫🇷 Puteaux 310 2017
24
NEXTEDIAnextedia.com

The Nextedia Group specializes in Cybersecurity, Cloud, Digital Workspace, and Customer Experience, providing expertise and solutions to large companies across various sectors

IT Services and IT Consulting 🇫🇷 Puteaux 305 n/a
25
Devoteam | AWS Partnerdevoteam.com

It is an AWS Premier Consulting Partner with over 450 experts, providing scalable infrastructure and innovative solutions across multiple European countries.

IT Services and IT Consulting 🇫🇷 Levallois-Perret 290 n/a
26
Ozitemgroupeozitem.com

Supports customers with digital innovation. Provides IT and cloud infrastructure solutions, enabling clients to focus on their core business in the digital world.

IT Services and IT Consulting 🇫🇷 Levallois-Perret 285 1990
27
APL Data Centerapl-datacenter.com

Consultancy, engineering, construction, operation, and maintenance of data centers. Sustainable IT and ecological data center design.

Engineering Services 🇫🇷 Montrouge 280 1983
28
NEURONESneurones.net

A group of 5,400 experts specializing in management consulting, organization, and digital IT services, supporting clients in digital transformation projects and system upgrades

IT Services and IT Consulting 🇫🇷 Nanterre 259 1985
29
C2Sbouyguestelecom-business.fr

Providing IT services and innovative solutions in information systems, supported by partnerships and dynamic research and development activities.

IT Services and IT Consulting 🇫🇷 Issy-les-Moulineaux 243 n/a
30
Cellnex Francecellnex.com

Operating and maintaining mobile towers, fiber optic networks, and data centers for telecommunications operators and organizations requiring large-scale digital connectivity and hosting services.

Telecommunications 🇫🇷 Boulogne-Billancourt 240 2016

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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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