The professional services sector in Boulogne-Billancourt is characterized by a strong presence of IT and engineering consulting firms. These companies, ranging from mid-sized to large enterprises, offer specialized expertise in digital transformation, IT services, and various engineering fields. Key players include ALTEN, which provides engineering and IT services, and Astek, focusing on sustainable digital transformation. BNP Paribas Real Estate offers comprehensive real estate services, while Synergie France specializes in HR services.
Several companies, such as Viveris and Apside, concentrate on information systems and technical computing. The presence of firms like Excelya and AIXIAL GROUP indicates a cluster of expertise in clinical development and pharmaceutical services. A common thread across many of these firms is their focus on high-value consulting and technical support for businesses seeking digital and technological advancement.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 | 38,710 | ||||
| 2 |
Astekastekgroup.fr
Supports clients with high-value service, deep technical expertise across technology, operations, and engineering, focusing on sustainable digital transformation with humans at the core. |
6,035 | |||
| 3 |
Synergie Francesynergie.fr
French leader in HR services: recruitment, training, and HR consulting Providing solutions in various sectors, emphasizing proximity, performance, and diversity |
4,804 | |||
| 4 |
BNP Paribas Real Estatebnpparibas.com
Offers comprehensive real estate services including property development, transactions, consulting, valuation, and property management across Europe, the Middle East, and Asia. |
4,173 | |||
| 5 | 3,016 | ||||
| 6 |
Apsideapside.com
Provides consulting, engineering in Information Systems, Technical and Scientific Computing, Automotive and Financial Engineering, for large French and European groups. |
2,300 | |||
| 7 | 2,075 | ||||
| 8 |
Davidson consultingdavidson.fr
A management consulting and technology company with over 2,000 employees, expanding internationally with a focus on employee well-being and creativity |
1,843 | |||
| 9 |
Rentokil Initial Francerentokil-initial.com
Pest control, hygiene solutions, cleaning, catering, interior landscaping, package delivery, and integrated facilities services for diverse customers. |
979 | |||
| 10 |
Viverisviveris.fr
consulting and engineering company for information systems, technical computing, and embedded systems, providing support from definition to integration. |
899 | |||
| 11 |
Nomios Groupnomios.com
Designs, secures, and manages digital infrastructures, developing innovative cybersecurity and networking solutions through consulting, managed, and professional services for organizations. |
887 | |||
| 12 |
Bee Engineeringbee-eng.com
Specializing in energy, processes, infrastructure, and transportation industries, we are a team of over 800 ambitious professionals based in 10 major cities |
859 | |||
| 13 |
Excelyaexcelya.com
Provides comprehensive CRO, FSP, and Resourcing solutions to Biotech, Pharma, and Medical Device organizations, offering bespoke trial solutions across various therapeutic areas. |
701 | |||
| 14 |
AIXIAL GROUPaixialgroup.com
Specialized partner in clinical development, providing comprehensive trial design, execution, functional service delivery, resources, and expert consulting for efficient clinical trials. |
616 | |||
| 15 |
PRIME ENGINEERING Franceprimeengineering.fr
Engineering consulting firm, specializing in energy, infrastructure, and IT/telecom sectors, providing expertise and know-how since 2006. |
603 | |||
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 | 435 | ||||
| 17 |
MEOGROUPmeogroup-partners.com
Specializing in consulting services for a wide range of industries, providing operational solutions and recruitment services for companies of all sizes |
428 | |||
| 18 |
SARAWAK FRANCEsarawak.fr
Specializing in outsourced sales forces, animations in stores, and maximizing brand performance through motivated talents for consumer-centric results |
392 | |||
| 19 |
Audensielaudensiel.com
Supports clients in digital transformation projects, providing IT and business consulting, data/AI solutions, cybersecurity, and cloud/DevOps expertise. |
391 | |||
| 20 |
ADENTISadentis.fr
High-tech consulting company developing software and embedded systems for digital TV, telecom, medical electronics, defense, and aeronautics. Research lab. |
362 | |||
| 21 |
Concentrix Medicamedica.concentrix.com
Support pharmaceutical companies in promoting and selling products to healthcare professionals, plus patient coaching and disease management expertise. |
327 | |||
| 22 |
MEOTECmeotec.com
Operational consulting firm providing support in project management, purchasing, supply chain, economic performance, quality, processes, IS, and technology. |
325 | |||
| 23 |
Lincoln Francelincoln.fr
Offers data science and Modern BI expertise, consulting, and support for decision-making projects, utilizing predictive analysis and machine learning algorithms. |
316 | |||
| 24 | 293 | ||||
| 25 |
Parthena Consultantparthena.com
Integrates and supports management solutions like accounting, commercial management, payroll, CRM, and business management, offering services from analysis to hotline support. |
264 | |||
| 26 | 262 | ||||
| 27 |
ITS Servicesitsservices.fr
ITS Services is a leading company in IT Infrastructure & Operations, offering expertise in Observability, SRE, and AIOps for accelerated time to market |
240 | |||
| 28 |
Cellenzacellenza.com
Provides IT consulting and implementation services, specializing in Microsoft Cloud solutions, including advisory, security, data, AI, and application development, aiding digital transformation. |
223 | |||
| 29 |
GROUPE FACTORIAfactoria-groupe.fr
Providing specialized IT, telecom, printing, office furniture, and interactive screen solutions tailored for SMEs, professionals, and administrations in France. |
212 | |||
| 30 |
Degeteldegetel.com
Provides digital transformation consulting, implements concrete solutions, simplifies user experience, and manages end-to-end business challenges for clients. |
180 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 14, 2026.
More company lists in Boulogne-Billancourt
- The largest companies in Boulogne-Billancourt 791
- Multinational companies in Boulogne-Billancourt 188
- IT services companies in Boulogne-Billancourt 125
- IT Services and IT Consulting companies in Boulogne-Billancourt 105
- Consulting firms in Boulogne-Billancourt 88
- SaaS companies in Boulogne-Billancourt 79
- Advertising Services companies in Boulogne-Billancourt 77
- Companies with in-house R&D in Boulogne-Billancourt 66
- Marketing and communications agencies in Boulogne-Billancourt 60
- Business Consulting and Services companies in Boulogne-Billancourt 59
- Software Development companies in Boulogne-Billancourt 51
- Subscription businesses in Boulogne-Billancourt 43
- Retail chains in Boulogne-Billancourt 41
- Companies with a mobile app in Boulogne-Billancourt 34
- Recruitment and staffing agencies in Boulogne-Billancourt 32
- Manufacturers in Boulogne-Billancourt 32
- Data and analytics companies in Boulogne-Billancourt 29
- Events Services companies in Boulogne-Billancourt 29
- AI companies in Boulogne-Billancourt 28
The same list elsewhere in France
- Professional services firms in France 6,608
- Professional services firms in Île-de-France 3,375
- Professional services firms in Auvergne-Rhône-Alpes 710
- Professional services firms in the Hauts-de-Seine department 629
- Professional services firms in Provence-Alpes-Côte d'Azur 433
- Professional services firms in Occitanie 399
- Professional services firms in the Rhône department 398
- Professional services firms in Grand Est 318
- Professional services firms in Nouvelle-Aquitaine 308
- Professional services firms in Hauts-de-France 260
- Professional services firms in Pays de la Loire 253
- Professional services firms in the Bouches-du-Rhône 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 the Ille-et-Vilaine department 94
- Professional services firms in Paris 2,240
- Professional services firms in Lyon 264
- Professional services firms in Toulouse 139
- Professional services firms in Marseille 123