This list features large and mid-sized professional services firms in the Bouches-du-Rhône department, primarily focused on industrial support, engineering, and IT consulting. Companies like Onet SA, a family service group, Ortec Group, providing multidisciplinary industrial services, and Catering International & Services CIS, offering integrated services for remote sites, are prominent. Onet Technologies specializes in nuclear engineering, while Klanik provides IT engineering consulting.
The data shows a strong concentration of headquarters in Marseille, with several companies also based in Aix-en-Provence and Vitrolles. The firms cover a range of services from facilities management and environmental solutions to complex IT and engineering projects, indicating a diverse yet interconnected professional services landscape in the region.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Onet SAgroupeonet.com
A family service group with 74,000 employees in 8 countries, offering a wide range of services including cleaning, security, engineering, and maintenance |
14,750 | |||
| 2 |
Ortec Grouportec-group.com
Provides multidisciplinary services for industry, energy, and environment, including maintenance, new works, environmental services, facilities management, logistics, and engineering consulting. |
4,388 | |||
| 3 |
Catering International & Services CIScis-integratedservices.com
Providing integrated services and turnkey solutions ensuring well-being and safety for residents in remote offshore and onshore project sites worldwide. |
2,899 | |||
| 4 |
Onet Technologiesonet.fr
Expertise in nuclear engineering and services for reactor maintenance, dismantling, decommissioning, waste management, and training within the nuclear industry lifecycle. |
2,071 | |||
| 5 |
Onet Propreté et Servicesonet.fr
Maintaining hygiene and cleanliness in various environments, including workplaces, public spaces, and transport areas, ensuring they are clean, healthy, and pleasant. |
2,038 | |||
| 6 |
ATEXISatexis.com
Innovates sustainable, secure technology, assisting customers with operations and maintenance of complex systems across various sectors like aerospace and defense. |
809 | |||
| 7 |
GROUPE ETICetic-groupe.com
Outsourced reception services, event staffing, physical security monitoring, customer relationship management via call centers, and professional fire safety audit and training programs. |
636 | |||
| 8 |
Groupe ACCEO | BET Energie, Ascenseur, Environnement, AMO & MOE Spécialiséesacceo.eu
Providing specialized engineering consulting for buildings, focusing on elevators, energy efficiency, environment, and project management to optimize operations and reduce costs. |
569 | |||
| 9 |
Sonovision - Ortec Groupsonovisiongroup.com
Experts process complex systems content, enriching products with innovative solutions throughout their lifecycle, from design to technical content and training for optimized field operations. |
568 | |||
| 10 |
Klanikklanik.com
Provides IT engineering consulting, assisting partners with digital and technological projects, leveraging expert talent across various technological verticals globally for digital transformation. |
548 | |||
| 11 |
Onet Accueilonet.fr
The company specializes in providing reception services that are both pleasant and useful, facilitating efficient connections between different stakeholders on site |
483 | |||
| 12 |
Key Performance Consulting (KPC)keyperformance-consulting.com
Global player in upstream and integration phases for systems, offering technology consulting and services for large project integration and business process improvement. |
474 | |||
| 13 |
TPF INGENIERIEtpf-i.fr
An engineering company specializing in Building, Infrastructure, Water/Environment, Energy/Maintenance sectors with a collaborative and innovative approach to project development |
470 | |||
| 14 |
setec internationalinter.setec.fr
Engineering consultancy specializing in transport infrastructure projects including feasibility, design, environmental studies, and project management across France and internationally. |
446 | |||
| 15 |
CMR Groupcmr-group.com
Specializing in sensors and automation systems for diesel engines, CMR offers control solutions in energy, industry, and marine sectors, focusing on sustainability and ethical practices |
428 | |||
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 |
Interwayinterway.fr
Managed IT services including outsourcing, network integration, payment solutions, interactive digital systems, and extensive support for diverse sectors nationwide. |
398 | |||
| 17 |
iQantoiqanto.net
Industrial transformation through automation, robotics, AI, and cybersecurity to improve processes and deploy intelligent systems across diverse sectors for small and large enterprises. |
349 | |||
| 18 |
Chambre de Commerce et d'Industrie Marseille-Provencecciamp.com
Provides business support services and infrastructure development for 115,000 local companies while promoting regional economic competitiveness and digital transformation in standard international markets. |
336 | |||
| 19 |
Home-Serviceshome-services.com
Home Services provides home assistance in the Var, Bouches du Rhône, and Vaucluse regions, offering services like childcare, elderly care, housekeeping, and more |
331 | |||
| 20 |
SEA TPIseatpi.com
ESN specializing in IT operations, offering services in supervision, system administration, cybersecurity, and support Constantly hiring various IT professionals nationwide Visit website for job opportunities |
321 | |||
| 21 |
ECP - Project Management .INtelligenceassystem.com
Project Management Consulting Group specializing in Oil & Gas, Nuclear, Energy, Defense, Infrastructures, Chemistry, Metallurgy sectors Services include project management, cost estimation, risk management, and more |
287 | |||
| 22 |
l'Escalelescale.io
A platform offering a professional break tailored for parents, with a 8-week online program to guide them towards finding a job that suits them |
286 | |||
| 23 | 282 | ||||
| 24 |
OCEANCALLoceancall.co
OceanCall is an independent and innovative outsourcing company offering flexible, personalized solutions for customer relations and data processing to boost growth and enhance customer interactions |
272 | |||
| 25 |
Altereoaltereo.fr
An independent French company driving clients from ideas to behaviors, specializing in water engineering, public utility management, city sustainability, and geographic intelligence solutions |
229 | |||
| 26 |
Seres Technologiesseres-technologies.com
Specializes in risk management, complex systems design, and R&D, supporting industries like mobility, defense, and energy with comprehensive safety and security solutions. |
220 | |||
| 27 |
Job Linkjoblink.fr
A specialist recruitment agency in France with 16 branches, offering selective and efficient recruitment services to clients and connecting candidates with desired jobs |
219 | |||
| 28 |
ARKADIA Grouparkadiagroup.fr
ARKADIA Group is an independent engineering and services firm specializing in Energy and Aerospace/Transport sectors, offering expertise in large industrial projects worldwide |
214 | |||
| 29 |
FATEC Groupfatec-group.com
A leading independent fleet management company in France, providing transparent services for a range of clients, with expertise in responsible mobility |
204 | |||
| 30 |
Apave Sudeurope SAS
An individual & family services company based in Marseille, France, offering a variety of services to support individuals and families |
203 | |||
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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 12, 2026.
More company lists in the Bouches-du-Rhône department
- The largest companies in the Bouches-du-Rhône department 3,317
- Multinational companies in the Bouches-du-Rhône department 351
- Companies with in-house R&D in the Bouches-du-Rhône department 320
- Retail chains in the Bouches-du-Rhône department 281
- Manufacturers in the Bouches-du-Rhône department 187
- Public sector organisations in the Bouches-du-Rhône department 183
- Distributors and wholesalers in the Bouches-du-Rhône department 156
- IT services companies in the Bouches-du-Rhône department 155
- IT Services and IT Consulting companies in the Bouches-du-Rhône department 154
- SaaS companies in the Bouches-du-Rhône department 145
- Hardware manufacturers in the Bouches-du-Rhône department 142
- Family-owned companies in the Bouches-du-Rhône department 142
- Consulting firms in the Bouches-du-Rhône department 129
- Software Development companies in the Bouches-du-Rhône department 120
- Education providers in the Bouches-du-Rhône department 119
- Business Consulting and Services companies in the Bouches-du-Rhône department 113
- Real Estate companies in the Bouches-du-Rhône department 109
- Healthcare providers in the Bouches-du-Rhône department 107
- Law Practice companies in the Bouches-du-Rhône department 100
- Critical infrastructure operators in the Bouches-du-Rhône department 98
- Accounting firms in the Bouches-du-Rhône department 93
- Accounting companies in the Bouches-du-Rhône department 92
- Construction companies in the Bouches-du-Rhône department 91
- Higher Education companies in the Bouches-du-Rhône department 83
The same list elsewhere in France
- Professional services firms in France 6,610
- Professional services firms in Île-de-France 3,377
- Professional services firms in Auvergne-Rhône-Alpes 711
- Professional services firms in the Hauts-de-Seine department 629
- Professional services firms in Provence-Alpes-Côte d'Azur 433
- Professional services firms in the Rhône department 400
- Professional services firms in Occitanie 399
- 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 253
- 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 2,241
- 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