The Val-d'Oise department hosts a concentration of professional services firms, ranging from IT and security to industrial manufacturing and aviation. These companies include both established mid-sized firms and younger enterprises. Many specialize in niche technical services, catering to business clients.
Among them, Chubb Fire & Security France provides fire and electronic security solutions. Worldgrid specializes in smart energy solutions for utilities, while SERIMAX is a global leader in pipeline welding. JRI develops temperature monitoring solutions for healthcare and industry, and Simaero offers pilot training and simulation engineering.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Chubb Fire & Security Francechubbfs.com
Fire and electronic security solutions provider. Installation, maintenance of detection, extinction, access control, video surveillance systems, and remote monitoring for businesses and individuals. |
1,661 | |||
| 2 | 970 | ||||
| 3 |
SERIMAXserimax.com
Global leader in pipeline welding solutions, offering high quality automatic and manual welding services on land and sea, in tough conditions Specializes in innovative equipment |
748 | |||
| 4 |
JRIjri-mms.com
Develops temperature monitoring solutions for thermo-sensitive products in healthcare, food, and industry, utilizing IoT technology and offering metrology services. |
298 | |||
| 5 | 199 | ||||
| 6 |
Edifixioedifixio.com
Provides IT services to large international companies, specializing in Industry, Retail, Insurance, and Services sectors, with a global presence. |
192 | |||
| 7 |
CONSUL'TECH
Founded in 2008, the company specializes in technical engineering, construction, project management, maintenance engineering, and technical management support for real estate professionals |
124 | |||
| 8 |
H-Tech Supportshtechsupports.com
Provides modern IT and network solutions, offering managed IT support, professional consulting, data solutions, and maintenance services to enterprise markets worldwide. |
107 | |||
| 9 | 96 | ||||
| 10 |
SPIE Operationsspie.com
Provides multi-technical services in energy and communications sectors, supporting energy transition and digital transformation with diverse, committed teams. |
70 | |||
| 11 |
BeGCfr.begc-groupe.com
Engineering & design office specializing in mechanical engineering, machines design, automation, and safety audits for various industries worldwide since 1981 |
60 | |||
| 12 |
IMP360imp-360.com
Specialist in healthcare IT providing security evaluation, system integration, infrastructure management, medical imaging solutions, and continuity planning for clients. |
54 | |||
| 13 |
Time to Flytimetofly.eu
Consulting company specializing in aeronautics founded by an experienced airline manager Services include aviation operation, engineering, maintenance, safety, and airport consulting worldwide |
53 | |||
| 14 |
STEPHYAstephya.com
STEPHYA is a DATACENTER service center in France, offering IT relocation services across Europe with experienced consultants and highly skilled technicians |
50 | |||
| 15 |
Snapcomsnapcom.eu
Specializes in consulting, deploying, and optimizing unified communications, videoconferencing, audiovisual, and event solutions with expert services and training. |
43 | |||
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 |
Negociatisnegociatis.com
Support companies of all sizes in their commercial development through expertise in national and international B2B sales of products and services. |
37 | |||
| 17 |
INFODIPinfodip.com
A European IT company with 35 years' experience, offering customized solutions, appliances, service delivery, and support adhering to ISO 9001 standards |
35 | |||
| 18 |
Techmatechmadev.com
Provider of services, turnkey supply, and technical assistance for industrial process control, automation, instrumentation, safety, SCADA, and telecoms for over 25 years |
33 | |||
| 19 |
MIDRANGE Groupmidrange-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. |
28 | |||
| 20 |
Skills & Affinityskillsaffinity.com
Skills & Affinity is an innovative recruitment solution focusing on human connection, matching talents with companies based on projects and skills |
26 | |||
| 21 |
Dao-Infranetdao-infranet.com
A specialized engineering firm offering VRD studies, topography, and network detection services with experienced team, advanced equipment, and high client satisfaction |
23 | |||
| 22 |
Comme Une Imagecommeuneimage.fr
A communication agency offering graphic design, editorial expertise, event planning, PR, and digital strategies to help businesses stand out authentically |
23 | |||
| 23 |
INCUB'ETHICincubethic.fr
Consulting firm specializing in sustainable development, CSR, energy eco-efficiency, multiservice solutions, and ethical investment with human-centered leadership. |
22 | |||
| 24 |
Apave Parisienne Osny
This company offers comprehensive services in training, inspections, building, testing, consulting, and certification to help businesses and municipalities manage technical, human, and environmental risks |
21 | |||
| 25 |
RH'Venturerhventure.fr
Supports small and medium-sized businesses in structuring their HR function and ensuring the success of their HRIS projects, providing temporary HR and HRIS reinforcement. |
20 | |||
| 26 |
IT-tudeit-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 |
16 | |||
| 27 | 14 | ||||
| 28 |
INSIDE AMO CONCEPTinside-ac.com
Inside offers services in project management, technical control, and consulting for real estate assets in various sectors such as commercial, residential, and office spaces |
13 | |||
| 29 |
EXPORTECHexportech.eu
Exportech helps small businesses in electronics, plastics, and metallurgy sectors achieve practical results in their export projects with a specialized, multilingual team |
13 | |||
| 30 |
JM MATEU, A SANCHEZ & JC TASSEL NOTAIRES ASSOCIESmagma.notaires.fr
A team of 8 notaries and 30 staff members operating in two locations, specializing in legal services in Magny en Vexin and Mantes la Jolie |
13 | |||
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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 Val-d'Oise department
- The largest companies in the Val-d'Oise department 849
- Multinational companies in the Val-d'Oise department 128
- Companies with in-house R&D in the Val-d'Oise department 88
- Manufacturers in the Val-d'Oise department 85
- Hardware manufacturers in the Val-d'Oise department 70
- Distributors and wholesalers in the Val-d'Oise department 67
- Retail chains in the Val-d'Oise department 56
- Family-owned companies in the Val-d'Oise department 42
- IT services companies in the Val-d'Oise department 42
- IT Services and IT Consulting companies in the Val-d'Oise department 38
- Transportation, Logistics, Supply Chain and Storage companies in the Val-d'Oise department 33
- Aerospace and defence companies in the Val-d'Oise department 31
- Public sector organisations in the Val-d'Oise department 30
- Construction companies in the Val-d'Oise department 29
- Wholesale companies in the Val-d'Oise department 29
- Healthcare providers in the Val-d'Oise department 27
- Industrial Machinery Manufacturing companies in the Val-d'Oise department 27
- Government Administration companies in the Val-d'Oise department 26
- Logistics companies in the Val-d'Oise department 25
The same list elsewhere in France
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- Professional services firms in Auvergne-Rh么ne-Alpes 711
- Professional services firms in the Hauts-de-Seine department 629
- Professional services firms in Provence-Alpes-C么te d'Azur 433
- Professional services firms in the Rh么ne department 400
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- Professional services firms in Grand Est 316
- Professional services firms in Nouvelle-Aquitaine 308
- Professional services firms in Hauts-de-France 260
- Professional services firms in Pays de la Loire 254
- Professional services firms in the Bouches-du-Rh么ne department 249
- Professional services firms in the Haute-Garonne department 208
- Professional services firms in the Nord department 178
- Professional services firms in Brittany 167
- Professional services firms in the Loire-Atlantique department 158
- Professional services firms in the Gironde department 151
- Professional services firms in Normandy 114
- Professional services firms in the Yvelines department 108
- Professional services firms in Paris 2,241
- Professional services firms in Lyon 265
- Professional services firms in Toulouse 139
- Professional services firms in Marseille 123
- Professional services firms in Boulogne-Billancourt 102