# The 30 largest IT services companies in the Val-d'Oise department
Tamtam tracks 42 IT services companies headquartered in the Val-d'Oise department. This list ranks the 30 largest by number of employees on LinkedIn, led by Eviden, Worldgrid and Edifixio. Their median headcount is 35. Half of them were founded in 2004 or later. The most common headquarters are Bezons (7), Roissy-en-France (4) and Cergy (3).
These companies in Val-d'Oise are primarily IT services providers, ranging from large groups to mid-sized firms. Eviden, with over 10,000 employees, is a global leader in digital transformation. Worldgrid specializes in smart energy solutions, while Edifixio provides IT services to international companies. C2C focuses on IP network communication systems.
The data shows a strong concentration of IT services companies in Bezons, including Eviden, Worldgrid, Edifixio, digital.security, and Snapcom. This indicates a hub for digital and IT expertise within the department. Other companies like H-Tech Supports and IMP360 also contribute to the diverse IT landscape.
馃嚝馃嚪 Val-d'Oise 路 30 companies 路 Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Eviden](https://www.tamtam.ai/c/eviden) (eviden.com)
Eviden is a global leader in digital transformation, offering expertise in digital, cloud, data, advanced computing, and security solutions to industries worldwide | IT Services and IT Consulting | 馃嚝馃嚪 Bezons | 10,793 | |
| 2 | [Worldgrid](https://www.tamtam.ai/c/worldgrid) (alten.com)
Specializing in smart energy solutions for utilities, we offer integration projects and real-time solutions across the power, water, oil & gas sectors | IT Services and IT Consulting | 馃嚝馃嚪 Bezons | 970 | 2009 |
| 3 | [Edifixio](https://www.tamtam.ai/c/edifixio) (edifixio.com)
Provides IT services to large international companies, specializing in Industry, Retail, Insurance, and Services sectors, with a global presence. | IT Services and IT Consulting | 馃嚝馃嚪 Bezons | 192 | 2000 |
| 4 | [C2C](https://www.tamtam.ai/c/c2c) (c2c-reseaux.fr)
C2C is a specialized integrator in IP Network Communication Systems, covering areas such as cabling infrastructure, wireless, video surveillance, and access control solutions | Computer Networking Products | 馃嚝馃嚪 Roissy-en-France | 174 | 1996 |
| 5 | [H-Tech Supports](https://www.tamtam.ai/c/h-tech-supports) (htechsupports.com)
Provides modern IT and network solutions, offering managed IT support, professional consulting, data solutions, and maintenance services to enterprise markets worldwide. | IT Services and IT Consulting | 馃嚝馃嚪 Saint-Leu-la-For锚t | 107 | 2016 |
| 6 | [SPIE Operations](https://www.tamtam.ai/c/spie-operations) (spie.com)
Provides multi-technical services in energy and communications sectors, supporting energy transition and digital transformation with diverse, committed teams. | IT Services and IT Consulting | 馃嚝馃嚪 Cergy | 70 | |
| 7 | [JL Consulting JLC](https://www.tamtam.ai/c/jl-consulting-jlc) (jlconsulting.fr)
Consulting firm specializing in ERP, CRM, and BI systems, focusing on employee well-being and long-term client partnerships. | IT Services and IT Consulting | 馃嚝馃嚪 Ermont | 69 | 2004 |
| 8 | [1G-LINK](https://www.tamtam.ai/c/1g-link) (1glink.com)
A passionate community of technology experts leveraging diverse skills to deliver disruptive digital solutions and drive brand resilience through innovation and success | Business Consulting and Services | 馃嚝馃嚪 Bezons | 60 | 2010 |
| 9 | [RODRIGUE](https://www.tamtam.ai/c/rodrigue) (rodrigue.fr)
A leading independent digital services company specializing in ticketing solutions for leisure sector, with extensive experience in managing, selling, and marketing tickets globally | Software Development | 馃嚝馃嚪 Sannois | 58 | 1999 |
| 10 | [IMP360](https://www.tamtam.ai/c/imp360) (imp-360.com)
Specialist in healthcare IT providing security evaluation, system integration, infrastructure management, medical imaging solutions, and continuity planning for clients. | IT Services and IT Consulting | 馃嚝馃嚪 Roissy-en-France | 54 | 1997 |
| 11 | [digital.security](https://www.tamtam.ai/c/digital-security) (eviden.com)
Offers advanced audit, consulting, and an IoT CERT for companies and governments. Specializes in integration, operational security, and SOC/SIEM management. | Computer and Network Security | 馃嚝馃嚪 Bezons | 52 | 2015 |
| 12 | [STEPHYA](https://www.tamtam.ai/c/stephya) (stephya.com)
STEPHYA is a DATACENTER service center in France, offering IT relocation services across Europe with experienced consultants and highly skilled technicians | IT Services and IT Consulting | 馃嚝馃嚪 Montmorency | 50 | 1999 |
| 13 | [Snapcom](https://www.tamtam.ai/c/snapcom) (snapcom.eu)
Specializes in consulting, deploying, and optimizing unified communications, videoconferencing, audiovisual, and event solutions with expert services and training. | IT Services and IT Consulting | 馃嚝馃嚪 Bezons | 43 | 2005 |
| 14 | [INFODIP](https://www.tamtam.ai/c/infodip) (infodip.com)
A European IT company with 35 years' experience, offering customized solutions, appliances, service delivery, and support adhering to ISO 9001 standards | IT Services and IT Consulting | 馃嚝馃嚪 Saint-Leu-la-For锚t | 35 | 1986 |
| 15 | [Add-On](https://www.tamtam.ai/c/add-on) (addon.fr)
A company that provides hosting, operating, and cloud services, offering tailored support for virtualization projects and IT infrastructure consolidation Contact for specialized IT expertise | IT Services and IT Consulting | 馃嚝馃嚪 Vigny | 35 | 1999 |
| 16 | [SERVICE EXPERT ENTREPRISE](https://www.tamtam.ai/c/service-expert-entreprise) (serviceexpert.fr)
Specializes in IT integration and support for professionals, focusing on telephony, internet, data, computing, office equipment, and security solutions. | Telecommunications | 馃嚝馃嚪 Saint-Gratien | 33 | 2007 |
| 17 | [devo.to](https://www.tamtam.ai/c/devo-to) (devo.to)
A web agency established in 2011, specializing in custom business application development for web, app, and mobile platforms Contact: contact@devotofr | Software Development | 馃嚝馃嚪 Cergy | 33 | 2011 |
| 18 | [VNB-IT](https://www.tamtam.ai/c/vnb-it) (vnb-it.fr)
Delivering specialized maintenance, network security installation, and professional surveillance systems alongside comprehensive development of web applications, mobile apps, and business websites for digital growth. | IT Services and IT Consulting | 馃嚝馃嚪 Pontoise | 33 | 2022 |
| 19 | [MIDRANGE Group](https://www.tamtam.ai/c/midrange-group) (midrange-group.com)
Provides innovative, tailor-made digital services like IT support, AI, data, and IT asset disposition, focusing on sustainability and local economic commitment for businesses. | IT Services and IT Consulting | 馃嚝馃嚪 Saint-Ouen-l'Aum么ne | 28 | 1993 |
| 20 | [TECH-EVENT](https://www.tamtam.ai/c/tech-event) (tech-event.net)
Development and provision of computer software solutions and services, operating primarily from France, focusing on technology and innovation. | Events Services | 馃嚝馃嚪 Roissy-en-France | 27 | 2004 |
| 21 | [WYSIWYG](https://www.tamtam.ai/c/wysiwyg) (wysiwyg.fr)
Provider of private clouds for professionals hosting IT systems and full office environments, offering ERP, CRM, business management tools, and production management solutions | IT Services and IT Consulting | 馃嚝馃嚪 Cergy | 25 | 1999 |
| 22 | [Big Data Consulting](https://www.tamtam.ai/c/big-data-consulting) (linktr.ee)
Big Data Consulting specializes in dematerializing and optimizing EDI flows and processes to enhance exchange automation and security between partners' ERPs | IT Services and IT Consulting | 馃嚝馃嚪 Garges-l猫s-Gonesse | 24 | 2005 |
| 23 | [ELICOM SAS - Groupe Teleos](https://www.tamtam.ai/c/elicom-sas-groupe-teleos) (5emeavenue.fr)
An IT and Telecom solutions integrator in Pierrelaye, France, providing expertise, technology solutions, and support to businesses for over 20 years | IT Services and IT Consulting | 馃嚝馃嚪 Saint-Ouen-l'Aum么ne | 18 | 1988 |
| 24 | [ANTANA - Informatique - Cybers茅curit茅 - Cloud Computing](https://www.tamtam.ai/c/antana-informatique-cybersecurite-cloud-computing) (antana.fr)
A technology company providing customized solutions for small and medium businesses, specializing in infrastructure, security, data backup, hardware selection, and event IT services | Computer and Network Security | 馃嚝馃嚪 Saint Gratien | 17 | 2005 |
| 25 | [IT-tude](https://www.tamtam.ai/c/it-tude) (it-tude.fr)
IT-tude by Infodis is a consulting and integration company specializing in IT Service Management, Enterprise Service Management, and IT Asset Management solutions | IT Services and IT Consulting | 馃嚝馃嚪 Roissy-en-France | 16 | 2014 |
| 26 | [EXTO SAS](https://www.tamtam.ai/c/exto-sas) (exto.fr)
Provides IT management consulting services, including software implementation, training, technical support, custom development, and IT infrastructure and security management for businesses. | Software Development | 馃嚝馃嚪 Goussainville | 14 | 1995 |
| 27 | [ADES ingenierie Informatique](https://www.tamtam.ai/c/ades-ingenierie-informatique) (ades-info.fr)
Specializing in IT solutions, this company offers consulting, network architecture, hardware/software selection, security, IT management, training, software development, and maintenance services for businesses | Computer and Network Security | 馃嚝馃嚪 Goussainville | 14 | 1991 |
| 28 | [Zor茅ole Services](https://www.tamtam.ai/c/zoreole-services) (zoreole.com)
Zoreole is an IT integrator and reseller specializing in secure computer networks, offering innovative solutions through partnerships with top vendors | Computer and Network Security | 馃嚝馃嚪 Montmorency | 13 | 2013 |
| 29 | [EDC NETWORKS](https://www.tamtam.ai/c/edc-networks) (edc-networks.fr)
EDC Networks is a Digital Services Company specializing in Tertiary / Smart Buildings, Industrial, and Data Center environments, offering innovative infrastructure solutions | IT Services and IT Consulting | 馃嚝馃嚪 Bezons | 12 | 2017 |
| 30 | [Elan Hospitality](https://www.tamtam.ai/c/elan-hospitality) (elan-hospitality.fr)
Specializing in multimedia solutions for the hospitality and healthcare accommodation industry, offering services such as IPTV, WiFi networks, IP telephony, and mobile website design | IT Services and IT Consulting | 馃嚝馃嚪 Franconville | 11 | 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 Val-d'Oise department
- [The largest companies in the Val-d'Oise department](https://www.tamtam.ai/l/largest-companies-val-doise) (849)
- [Multinational companies in the Val-d'Oise department](https://www.tamtam.ai/l/multinational-companies-val-doise) (128)
- [Companies with in-house R&D in the Val-d'Oise department](https://www.tamtam.ai/l/r-and-d-companies-val-doise) (88)
- [Manufacturers in the Val-d'Oise department](https://www.tamtam.ai/l/manufacturers-val-doise) (85)
- [Hardware manufacturers in the Val-d'Oise department](https://www.tamtam.ai/l/hardware-companies-val-doise) (70)
- [Distributors and wholesalers in the Val-d'Oise department](https://www.tamtam.ai/l/distributors-and-wholesalers-val-doise) (67)
- [Retail chains in the Val-d'Oise department](https://www.tamtam.ai/l/retail-chains-val-doise) (56)
- [Professional services firms in the Val-d'Oise department](https://www.tamtam.ai/l/professional-services-firms-val-doise) (44)
- [Family-owned companies in the Val-d'Oise department](https://www.tamtam.ai/l/family-owned-companies-val-doise) (42)
- [IT Services and IT Consulting companies in the Val-d'Oise department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-val-doise) (38)
- [Transportation, Logistics, Supply Chain and Storage companies in the Val-d'Oise department](https://www.tamtam.ai/l/transportation-logistics-supply-chain-and-storage-companies-val-doise) (33)
- [Aerospace and defence companies in the Val-d'Oise department](https://www.tamtam.ai/l/aerospace-and-defense-companies-val-doise) (31)
- [Public sector organisations in the Val-d'Oise department](https://www.tamtam.ai/l/public-sector-organisations-val-doise) (30)
- [Construction companies in the Val-d'Oise department](https://www.tamtam.ai/l/construction-companies-val-doise) (29)
- [Wholesale companies in the Val-d'Oise department](https://www.tamtam.ai/l/wholesale-companies-val-doise) (29)
- [Healthcare providers in the Val-d'Oise department](https://www.tamtam.ai/l/healthcare-providers-val-doise) (27)
- [Industrial Machinery Manufacturing companies in the Val-d'Oise department](https://www.tamtam.ai/l/industrial-machinery-manufacturing-companies-val-doise) (27)
- [Government Administration companies in the Val-d'Oise department](https://www.tamtam.ai/l/government-administration-companies-val-doise) (26)
- [Logistics companies in the Val-d'Oise department](https://www.tamtam.ai/l/logistics-companies-val-doise) (25)
## The same list elsewhere in France
- [IT services companies in France](https://www.tamtam.ai/l/it-services-companies-france) (5,000)
- [IT services companies in 脦le-de-France](https://www.tamtam.ai/l/it-services-companies-ile-de-france) (2,624)
- [IT services companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/it-services-companies-hauts-de-seine) (737)
- [IT services companies in Auvergne-Rh么ne-Alpes](https://www.tamtam.ai/l/it-services-companies-auvergne-rhone-alpes) (519)
- [IT services companies in the Rh么ne department](https://www.tamtam.ai/l/it-services-companies-rhone) (286)
- [IT services companies in Occitanie](https://www.tamtam.ai/l/it-services-companies-occitanie) (280)
- [IT services companies in Provence-Alpes-C么te d'Azur](https://www.tamtam.ai/l/it-services-companies-provence-alpes-cote-dazur) (268)
- [IT services companies in Grand Est](https://www.tamtam.ai/l/it-services-companies-grand-est) (248)
- [IT services companies in Hauts-de-France](https://www.tamtam.ai/l/it-services-companies-hauts-de-france) (236)
- [IT services companies in Pays de la Loire](https://www.tamtam.ai/l/it-services-companies-pays-de-la-loire) (205)
- [IT services companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/it-services-companies-nouvelle-aquitaine) (194)
- [IT services companies in the Nord department](https://www.tamtam.ai/l/it-services-companies-nord) (170)
- [IT services companies in the Haute-Garonne department](https://www.tamtam.ai/l/it-services-companies-haute-garonne) (158)
- [IT services companies in the Bouches-du-Rh么ne department](https://www.tamtam.ai/l/it-services-companies-bouches-du-rhone) (155)
- [IT services companies in the Loire-Atlantique department](https://www.tamtam.ai/l/it-services-companies-loire-atlantique) (130)
- [IT services companies in the Yvelines department](https://www.tamtam.ai/l/it-services-companies-yvelines) (121)
- [IT services companies in Brittany](https://www.tamtam.ai/l/it-services-companies-brittany) (113)
- [IT services companies in the Val-de-Marne department](https://www.tamtam.ai/l/it-services-companies-val-de-marne) (101)
- [IT services companies in the Gironde department](https://www.tamtam.ai/l/it-services-companies-gironde) (99)
- [IT services companies in Paris](https://www.tamtam.ai/l/it-services-companies-paris) (1,386)
- [IT services companies in Lyon](https://www.tamtam.ai/l/it-services-companies-lyon) (171)
- [IT services companies in Boulogne-Billancourt](https://www.tamtam.ai/l/it-services-companies-boulogne-billancourt) (125)
- [IT services companies in Toulouse](https://www.tamtam.ai/l/it-services-companies-toulouse) (119)
- [IT services companies in Levallois-Perret](https://www.tamtam.ai/l/it-services-companies-levallois-perret) (94)
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Source: https://www.tamtam.ai/l/it-services-companies-val-doise