These companies in Essonne are primarily engaged in IT services and IT consulting. They represent a mix of mid-sized firms and established companies, with a strong focus on digital transformation, cybersecurity, and infrastructure solutions. Many provide comprehensive services ranging from audits and consulting to integration and maintenance.
Key players include APIXIT, offering cybersecurity and cloud solutions, and Pasqal, which specializes in quantum simulators. MIEL distributes advanced hi-tech products, while DSI GROUP focuses on engineering services. IJNEXT is prominent in IT infrastructure, and APILOG Automation integrates industrial automation. A clear pattern is the concentration of headquarters in cities like Massy, Les Ulis, and Bièvres.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 303 | ||||
| 2 |
Pasqalpasqal.com
The company specializes in building programmable quantum simulators and computers using neutral atoms in optical tweezers for quantum information processing |
297 | |||
| 3 | 277 | ||||
| 4 |
DSI GROUPgroup-dsi.com
An engineering services company within the DSI GROUP, prioritizing staff development and customer relationships with a focus on flexibility and customer loyalty |
225 | |||
| 5 |
IJNEXTijnext.com
A major player in IT infrastructure services and innovative technologies, offering comprehensive solutions in security, performance, and automation through three interconnected companies |
202 | |||
| 6 |
APILOG Automationapilog.com
Specialized in industrial and commercial automation integration, part of a larger group with expertise in civil engineering and construction, serving SMEs |
115 | |||
| 7 |
KYOCERA Document Solutions Francekyoceradocumentsolutions.fr
Provide comprehensive document management solutions including software, hardware, and professional services to support digital transformation and reduce environmental impact. |
113 | |||
| 8 |
MOJOVIDAmojovida.fr
Specializing in point of sale information systems for distribution and restaurant chains, providing expertise in optimizing operations and customer service |
74 | |||
| 9 |
Groupe ATGTgroupe-atgt.com
The ATGT Group offers technical, legal, and land expertise for territorial development through modern surveying techniques and a focus on innovation |
70 | |||
| 10 |
SOLUTYS Groupsolutys.com
Specializes in automatic identification, network and cybersecurity solutions, offering comprehensive products and services to large companies and SMEs. |
65 | |||
| 11 |
Systematic Paris-Regionsystematic-paris-region.org
Community of 900 members focused on Deep Tech, accelerating digital transformation in industry, services, and society through collaborative innovation. |
59 | |||
| 12 |
IPSILAN NETWORKSipsilan-networks.fr
Integration of network and telecom solutions with strong technical expertise, client partnership, and proactive business development for tailored support. |
58 | |||
| 13 |
IBSibs-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 |
52 | |||
| 14 | 50 | ||||
| 15 |
PROTECTICprotectic.fr
Engineering company, intervening in large-scale industrial projects (aeronautics, space, defense, energy, transport). Accompanying major industrial players in product development. |
50 | |||
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 |
Elecom SASelecom.fr
French manufacturer of interactive solutions such as touch screens, kiosks, and digital applications Official Samsung partner delivering tailored solutions for events and businesses |
46 | |||
| 17 |
Junior CentraleSupélecjuniorcs.fr
Junior CentraleSupélec is a student-run consulting firm offering services in digital, electronics, strategy, data analytics, and environment sectors with over 4500 future engineering graduates |
42 | |||
| 18 |
ISIisicrunch.com
Development of SaaS platforms enabling publishers to create accessible, enriched digital textbooks and e-learning modules for learners with disabilities. |
41 | |||
| 19 |
NirWananirwana.fr
The company offers complete and highly customizable telephone systems, comprehensive IT solutions, network cabling, and tailored industrial servers and testing benches |
41 | |||
| 20 |
Coffreocoffreo.biz
The company provides HR dematerialization services for BtoB and BtoC customers, offering savings, environmental benefits, and secure storage for important documents |
40 | |||
| 21 |
HSBC TECHNOLOGIE
Information technology and services company located in Îledefrance, France, specializing in delivering technology solutions to clients |
38 | |||
| 22 | 34 | ||||
| 23 |
ATGT Géomètre-Expert
A Geomatics firm based in Ile de France and Auvergne Rhône Alpes, specializing in surveying and expert geographic services |
33 | |||
| 24 |
M2iinformatique-m2i.fr
Provides network installation, cloud services with Office 365, business applications, and security systems for companies and individuals. |
33 | |||
| 25 |
Automatants - Association d'IA de CentraleSupélecautomatants.cs-campus.fr
An association at CentraleSupélec school for AI enthusiasts, providing training, projects, and events focused on artificial intelligence technologies |
32 | |||
| 26 |
ANANASananas.bio
A company specializing in audiovisual and networking solutions for businesses, government, education, and retail spaces, offering high-quality products and expert advice |
29 | |||
| 27 |
LOGIC INSTRUMENTlogic-instrument.com
A supplier of mobile computers for B2B markets, offering rugged tablets and smartphones for industry, defense, and low-cost solutions for enterprises |
27 | |||
| 28 |
compuBase consultingen.compubase.net
Provider of channel information for IT and telecom sectors, offering business intelligence and marketing services to optimize clients' indirect sales networks |
27 | |||
| 29 |
CPP-SYSTEM
A consulting and IT service company operating in Madagascar and France, specialized in digital payment, customer loyalty, and management solutions Coming soon! |
24 | |||
| 30 |
INTRAPOLEintrapole.fr
Providing IT management, web development, event management software, consulting, hosting, security, and hardware supply with in-house expertise. |
23 | |||
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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 Essonne department
- The largest companies in the Essonne department 1,149
- Companies with in-house R&D in the Essonne department 198
- Multinational companies in the Essonne department 156
- Manufacturers in the Essonne department 127
- Hardware manufacturers in the Essonne department 114
- Distributors and wholesalers in the Essonne department 76
- Professional services firms in the Essonne department 68
- Public sector organisations in the Essonne department 66
- Aerospace and defence companies in the Essonne department 65
- IT services companies in the Essonne department 60
- Retail chains in the Essonne department 59
- Construction companies in the Essonne department 56
- Software Development companies in the Essonne department 51
- Pharmaceutical companies in the Essonne department 45
- Electronics and semiconductor companies in the Essonne department 44
- Research institutes in the Essonne department 42
- Events Services companies in the Essonne department 41
- SaaS companies in the Essonne department 41
- Consulting firms in the Essonne department 40
- Family-owned companies in the Essonne department 38
- Contract manufacturers in the Essonne department 35
- Research Services companies in the Essonne department 35
- Critical infrastructure operators in the Essonne department 32
- Education providers in the Essonne department 30
The same list elsewhere in France
- IT Services and IT Consulting companies in France 4,943
- IT Services and IT Consulting companies in Île-de-France 2,776
- IT Services and IT Consulting companies in the Hauts-de-Seine department 706
- IT Services and IT Consulting companies in Auvergne-Rhône-Alpes 455
- IT Services and IT Consulting companies in Provence-Alpes-Côte d'Azur 261
- IT Services and IT Consulting companies in Occitanie 259
- IT Services and IT Consulting companies in the Rhône department 253
- IT Services and IT Consulting companies in Hauts-de-France 226
- IT Services and IT Consulting companies in Grand Est 213
- IT Services and IT Consulting companies in Nouvelle-Aquitaine 190
- IT Services and IT Consulting companies in the Nord department 169
- IT Services and IT Consulting companies in Pays de la Loire 167
- IT Services and IT Consulting companies in the Bouches-du-Rhône department 154
- IT Services and IT Consulting companies in the Haute-Garonne department 152
- IT Services and IT Consulting companies in the Yvelines department 118
- IT Services and IT Consulting companies in the Val-de-Marne department 113
- IT Services and IT Consulting companies in the Loire-Atlantique department 110
- IT Services and IT Consulting companies in the Gironde department 105
- IT Services and IT Consulting companies in Brittany 101
- IT Services and IT Consulting companies in Paris 1,547
- IT Services and IT Consulting companies in Lyon 160
- IT Services and IT Consulting companies in Boulogne-Billancourt 105
- IT Services and IT Consulting companies in Toulouse 103
- IT Services and IT Consulting companies in Levallois-Perret 81