# Top 30 IT services companies in the Essonne department
Tamtam tracks 60 IT services companies headquartered in the Essonne department. This list ranks the 30 largest by number of employees on LinkedIn, led by APIXIT, G4 and NBTECH. Their median headcount is 50. Half of them were founded in 2002 or later. The most common headquarters are Massy (8) and Les Ulis (6).
These companies in Essonne are primarily engaged in IT services, consulting, and software development. They range from mid-sized firms to established companies, with the largest, APIXIT, employing 303 people. Other significant firms include G4, specializing in information management, NBTECH, focused on engineering services, and INTERDATA, providing expertise in IT networks and security.
A notable pattern among these companies is their geographical concentration. Many are headquartered in a few key municipalities within Essonne, such as Les Ulis, Massy, and Bi猫vres. This suggests a localized cluster of IT and engineering expertise within the department.
馃嚝馃嚪 Essonne 路 30 companies 路 Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [APIXIT](https://www.tamtam.ai/c/apixit) (apixit.fr)
Provides cybersecurity, infrastructure, and cloud solutions, supporting clients through audits, consulting, integration, maintenance, and managed services for digital transformation. | IT Services and IT Consulting | 馃嚝馃嚪 Les Ulis | 303 | 1992 |
| 2 | [G4](https://www.tamtam.ai/c/g4) (g4.fr)
G4 specializes in streamlining information management within companies, optimizing tools for strategic alignment and providing practical support and expertise | Information Services | 馃嚝馃嚪 Arpajon | 254 | 2006 |
| 3 | [NBTECH](https://www.tamtam.ai/c/nbtech) (nbtech.fr)
Technical studies, technology consulting, and industrial engineering services for automotive, aerospace, railway, and industrial maintenance sectors across France. | Engineering Services | 馃嚝馃嚪 Les Ulis | 244 | 2014 |
| 4 | [DSI GROUP](https://www.tamtam.ai/c/dsi-group) (group-dsi.com)
An engineering services company within the DSI GROUP, prioritizing staff development and customer relationships with a focus on flexibility and customer loyalty | IT Services and IT Consulting | 馃嚝馃嚪 Massy | 225 | 2007 |
| 5 | [IJNEXT](https://www.tamtam.ai/c/ijnext) (ijnext.com)
A major player in IT infrastructure services and innovative technologies, offering comprehensive solutions in security, performance, and automation through three interconnected companies | IT Services and IT Consulting | 馃嚝馃嚪 Les Ulis | 202 | |
| 6 | [INTERDATA](https://www.tamtam.ai/c/interdata) (interdata.fr)
French company providing certified expertise in IT networks, SI security, and observability for over 40 years Offering tailored services for reliable, scalable, and secure network management | Computer Networking Products | 馃嚝馃嚪 Les Ulis | 188 | 1979 |
| 7 | [CODRA](https://www.tamtam.ai/c/codra) (codra.net)
Specializing in industrial IT, our company offers automation and test system services while also developing and distributing software solutions for various industries | Software Development | 馃嚝馃嚪 Massy | 181 | 1986 |
| 8 | [APILOG Automation](https://www.tamtam.ai/c/apilog-automation) (apilog.com)
Specialized in industrial and commercial automation integration, part of a larger group with expertise in civil engineering and construction, serving SMEs | IT Services and IT Consulting | 馃嚝馃嚪 Massy | 115 | 2004 |
| 9 | [KYOCERA Document Solutions France](https://www.tamtam.ai/c/kyocera-document-solutions-france) (kyoceradocumentsolutions.fr)
Provide comprehensive document management solutions including software, hardware, and professional services to support digital transformation and reduce environmental impact. | IT Services and IT Consulting | 馃嚝馃嚪 Massy | 113 | 1959 |
| 10 | [EBS Group France](https://www.tamtam.ai/c/ebs-group-france) (ebsgroup.fr)
Provides comprehensive IT services and equipment management, offering tailored software and hardware solutions to small and medium businesses. | Software Development | 馃嚝馃嚪 Bi猫vres | 88 | |
| 11 | [MOJOVIDA](https://www.tamtam.ai/c/mojovida) (mojovida.fr)
Specializing in point of sale information systems for distribution and restaurant chains, providing expertise in optimizing operations and customer service | IT Services and IT Consulting | 馃嚝馃嚪 Nozay | 74 | 1999 |
| 12 | [SOLUTYS Group](https://www.tamtam.ai/c/solutys-group) (solutys.com)
Specializes in automatic identification, network and cybersecurity solutions, offering comprehensive products and services to large companies and SMEs. | IT Services and IT Consulting | 馃嚝馃嚪 Lisses | 65 | 2002 |
| 13 | [IPSILAN NETWORKS](https://www.tamtam.ai/c/ipsilan-networks) (ipsilan-networks.fr)
Integration of network and telecom solutions with strong technical expertise, client partnership, and proactive business development for tailored support. | IT Services and IT Consulting | 馃嚝馃嚪 Bi猫vres | 58 | 1997 |
| 14 | [IBS](https://www.tamtam.ai/c/ibs) (ibs-cloud.fr)
Global IT provider offering a wide range of services, including maintenance, IT management, and cybersecurity Experienced teams ensure personalized support for optimal system security and performance | IT Services and IT Consulting | 馃嚝馃嚪 Mennecy | 52 | 1978 |
| 15 | [PROTECTIC](https://www.tamtam.ai/c/protectic) (protectic.fr)
Engineering company, intervening in large-scale industrial projects (aeronautics, space, defense, energy, transport). Accompanying major industrial players in product development. | IT Services and IT Consulting | 馃嚝馃嚪 Bi猫vres | 50 | 1983 |
| 16 | [Elecom SAS](https://www.tamtam.ai/c/elecom-sas) (elecom.fr)
French manufacturer of interactive solutions such as touch screens, kiosks, and digital applications Official Samsung partner delivering tailored solutions for events and businesses | IT Services and IT Consulting | 馃嚝馃嚪 Villejust | 46 | 1986 |
| 17 | [Junior CentraleSup茅lec](https://www.tamtam.ai/c/junior-centralesupelec) (juniorcs.fr)
Junior CentraleSup茅lec is a student-run consulting firm offering services in digital, electronics, strategy, data analytics, and environment sectors with over 4500 future engineering graduates | IT Services and IT Consulting | 馃嚝馃嚪 Gif-sur-Yvette | 42 | 1969 |
| 18 | [Cyrias](https://www.tamtam.ai/c/cyrias) (cyrias.com)
Consulting and integration company specializes in assisting Purchasing and Finance Departments with implementing Cloud Solutions, offering expertise in digital transformation projects | Software Development | 馃嚝馃嚪 Massy | 42 | 2018 |
| 19 | [STYREL](https://www.tamtam.ai/c/styrel) (styrel.fr)
Engineering and training services specializing in industrial IT, embedded real-time computing, custom industrial PCs, test benches, and complete system integration. | Software Development | 馃嚝馃嚪 Le Plessis-P芒t茅 | 41 | 1984 |
| 20 | [EZYTAIL](https://www.tamtam.ai/c/ezytail) (ezytail.com)
Industrial supply chain management providing back office software, mutualized logistics, transportation solutions, ERP integration, and consulting for new and existing multi-channel retailing businesses. | Software Development | 馃嚝馃嚪 Grigny | 41 | 2010 |
| 21 | [NirWana](https://www.tamtam.ai/c/nirwana) (nirwana.fr)
The company offers complete and highly customizable telephone systems, comprehensive IT solutions, network cabling, and tailored industrial servers and testing benches | IT Services and IT Consulting | 馃嚝馃嚪 Morangis | 41 | 2009 |
| 22 | [ERT Int茅gration - Groupe Kardol](https://www.tamtam.ai/c/ert-integration-groupe-kardol) (kardol.fr)
A subsidiary of KARDOL Group, specializing in SAP BUSINESS ONE integration for small to medium-sized businesses with expertise in industry, after-sales service, and trade | Software Development | 馃嚝馃嚪 Massy | 40 | 2002 |
| 23 | [SOCASS](https://www.tamtam.ai/c/socass) (socass.fr)
Specialized consulting company focusing on maintenance, operations, technology engineering, and innovation for industrial and tertiary sectors with a human-centered approach | Engineering Services | 馃嚝馃嚪 Les Ulis | 39 | 2007 |
| 24 | [CREATYM France](https://www.tamtam.ai/c/creatym-france) (creatym-france.com)
Specialized in engineering services, technical consulting, and studies for industrial actors, prioritizing human-centric approach, teamwork, and passion for technology to enhance client services | Industrial Machinery Manufacturing | 馃嚝馃嚪 Massy | 36 | 2013 |
| 25 | [DML](https://www.tamtam.ai/c/dml) (dml.fr)
An ICT services provider established in 1998, offering technical expertise, consulting, project management, and technology integration in Security, CyberSecurity, Identity Management, and Messaging | IT Services and IT Consulting | 馃嚝馃嚪 Les Ulis | 34 | 1978 |
| 26 | [M2i](https://www.tamtam.ai/c/m2i-marolles-en-hurepoix) (informatique-m2i.fr)
Provides network installation, cloud services with Office 365, business applications, and security systems for companies and individuals. | IT Services and IT Consulting | 馃嚝馃嚪 Marolles-en-Hurepoix | 33 | 2010 |
| 27 | [ANANAS](https://www.tamtam.ai/c/ananas) (ananas.bio)
A company specializing in audiovisual and networking solutions for businesses, government, education, and retail spaces, offering high-quality products and expert advice | IT Services and IT Consulting | 馃嚝馃嚪 Ballancourt-sur-Essonne | 29 | 2020 |
| 28 | [Aryason Consulting](https://www.tamtam.ai/c/aryason-consulting) (aryason.fr)
Massy based firm specialized in providing professional advice on computer systems and software solutions with seven years of industry experience. | Software Development | 馃嚝馃嚪 Massy | 26 | 2013 |
| 29 | [GPLExpert](https://www.tamtam.ai/c/gplexpert) (gplexpert.com)
Specializing in healthcare IT, offering services and solutions to optimize information systems, manage projects, drive digital transformation, and ensure data security and system availability | Computer Networking Products | 馃嚝馃嚪 Arpajon | 25 | 2008 |
| 30 | [CPP-SYSTEM](https://www.tamtam.ai/c/cpp-system)
A consulting and IT service company operating in Madagascar and France, specialized in digital payment, customer loyalty, and management solutions Coming soon! | IT Services and IT Consulting | 馃嚝馃嚪 Ballainvilliers | 24 | |
## 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 Essonne department
- [The largest companies in the Essonne department](https://www.tamtam.ai/l/largest-companies-essonne) (1,149)
- [Companies with in-house R&D in the Essonne department](https://www.tamtam.ai/l/r-and-d-companies-essonne) (198)
- [Multinational companies in the Essonne department](https://www.tamtam.ai/l/multinational-companies-essonne) (156)
- [Manufacturers in the Essonne department](https://www.tamtam.ai/l/manufacturers-essonne) (127)
- [Hardware manufacturers in the Essonne department](https://www.tamtam.ai/l/hardware-companies-essonne) (114)
- [Distributors and wholesalers in the Essonne department](https://www.tamtam.ai/l/distributors-and-wholesalers-essonne) (76)
- [IT Services and IT Consulting companies in the Essonne department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-essonne) (70)
- [Professional services firms in the Essonne department](https://www.tamtam.ai/l/professional-services-firms-essonne) (68)
- [Public sector organisations in the Essonne department](https://www.tamtam.ai/l/public-sector-organisations-essonne) (66)
- [Aerospace and defence companies in the Essonne department](https://www.tamtam.ai/l/aerospace-and-defense-companies-essonne) (65)
- [Retail chains in the Essonne department](https://www.tamtam.ai/l/retail-chains-essonne) (59)
- [Construction companies in the Essonne department](https://www.tamtam.ai/l/construction-companies-essonne) (56)
- [Software Development companies in the Essonne department](https://www.tamtam.ai/l/software-development-companies-essonne) (51)
- [Pharmaceutical companies in the Essonne department](https://www.tamtam.ai/l/pharmaceutical-companies-essonne) (45)
- [Electronics and semiconductor companies in the Essonne department](https://www.tamtam.ai/l/electronics-companies-essonne) (44)
- [Research institutes in the Essonne department](https://www.tamtam.ai/l/research-institutes-essonne) (42)
- [Events Services companies in the Essonne department](https://www.tamtam.ai/l/events-services-companies-essonne) (41)
- [SaaS companies in the Essonne department](https://www.tamtam.ai/l/saas-companies-essonne) (41)
- [Consulting firms in the Essonne department](https://www.tamtam.ai/l/consulting-firms-essonne) (40)
- [Family-owned companies in the Essonne department](https://www.tamtam.ai/l/family-owned-companies-essonne) (38)
- [Contract manufacturers in the Essonne department](https://www.tamtam.ai/l/contract-manufacturers-essonne) (35)
- [Research Services companies in the Essonne department](https://www.tamtam.ai/l/research-services-companies-essonne) (35)
- [Critical infrastructure operators in the Essonne department](https://www.tamtam.ai/l/critical-infrastructure-operators-essonne) (32)
- [Education providers in the Essonne department](https://www.tamtam.ai/l/education-companies-essonne) (30)
## 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-essonne