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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Orangeorange.com
A leading global telecommunications operator offering services to millions of customers and multinational companies across 26 countries |
146,935 | |||
| 2 |
Econocomeconocom.com
Supplies, finances, and provides managed services for workplace, audiovisual, and infrastructures, supporting businesses in their digital transformation with equipment and support. |
7,123 | |||
| 3 |
Axiansaxians.com
A technology company supporting digital transformation by providing ICT solutions in cybersecurity, telecommunication, data analytics, cloud services, and more |
4,186 | |||
| 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. |
4,103 | |||
| 5 | 2,930 | ||||
| 6 | 1,741 | ||||
| 7 |
SCC Francescc.com
Provides comprehensive IT solutions, including cybersecurity, digital workplace, and hybrid infrastructure, enabling businesses to optimize operations and achieve their goals. |
1,422 | |||
| 8 | 1,358 | ||||
| 9 |
NXO Francenxo.eu
Independent leader in French Telecom integration, undertaking complex projects, anticipating customer needs, attracting talent, and focusing on well-done work. |
1,200 | |||
| 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. |
1,137 | |||
| 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. |
1,049 | |||
| 12 |
Nomios Groupnomios.com
Designs, secures, and manages digital infrastructures, developing innovative cybersecurity and networking solutions through consulting, managed, and professional services for organizations. |
887 | |||
| 13 | 586 | ||||
| 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. |
579 | |||
| 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 |
547 | |||
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 |
AMEXIOamexiogroup.com
Digital transformation partner specializing in Enterprise Content Management, Customer Communication Management, and Customer Experience Management, prioritizing human excellence for successful outcomes |
477 | |||
| 17 | 463 | ||||
| 18 | 435 | ||||
| 19 | 424 | ||||
| 20 |
Devoteam | Microsoft Partnerdevoteam.com
Premium Microsoft cloud consulting and managed services with expertise in cloud, cybersecurity, data, and sustainable digital transformation across EMEA. |
413 | |||
| 21 |
OUTSCALEoutscale.com
Sovereign cloud operator providing virtual twin solutions for data control, cyber governance, and sustainable infrastructure optimization for organizations. |
355 | |||
| 22 | 337 | ||||
| 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. |
310 | |||
| 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 |
305 | |||
| 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. |
290 | |||
| 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. |
285 | |||
| 27 |
APL Data Centerapl-datacenter.com
Consultancy, engineering, construction, operation, and maintenance of data centers. Sustainable IT and ecological data center design. |
280 | |||
| 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 |
259 | |||
| 29 |
C2Sbouyguestelecom-business.fr
Providing IT services and innovative solutions in information systems, supported by partnerships and dynamic research and development activities. |
243 | |||
| 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. |
240 | |||
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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.
More company lists in the Hauts-de-Seine department
- The largest companies in the Hauts-de-Seine department 5,160
- Multinational companies in the Hauts-de-Seine department 1,231
- IT services companies in the Hauts-de-Seine department 737
- IT Services and IT Consulting companies in the Hauts-de-Seine department 706
- Professional services firms in the Hauts-de-Seine department 629
- Consulting firms in the Hauts-de-Seine department 563
- Companies with in-house R&D in the Hauts-de-Seine department 510
- SaaS companies in the Hauts-de-Seine department 389
- Business Consulting and Services companies in the Hauts-de-Seine department 304
- Software Development companies in the Hauts-de-Seine department 301
- Retail chains in the Hauts-de-Seine department 292
- Manufacturers in the Hauts-de-Seine department 285
- Advertising Services companies in the Hauts-de-Seine department 281
- Marketing and communications agencies in the Hauts-de-Seine department 235
- Subscription businesses in the Hauts-de-Seine department 228
- Hardware manufacturers in the Hauts-de-Seine department 199
- Financial services firms in the Hauts-de-Seine department 198
- Companies with a mobile app in the Hauts-de-Seine department 189
- Critical infrastructure operators in the Hauts-de-Seine department 169
- AI companies in the Hauts-de-Seine department 159
- Education providers in the Hauts-de-Seine department 159
- Cybersecurity companies in the Hauts-de-Seine department 154
- Distributors and wholesalers in the Hauts-de-Seine department 154
- Recruitment and staffing agencies in the Hauts-de-Seine department 152
The same list elsewhere in France
- Managed service providers in France 749
- Managed service providers in Île-de-France 322
- 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 the Yvelines department 25
- Managed service providers in Paris 123