The professional services companies in Marseille listed here are mostly mid-sized firms, with a focus on business consulting, facilities management, and IT services. Onet SA, a family service group, provides a wide range of services including cleaning and security. Catering International & Services CIS offers integrated services for remote sites globally. Onet Technologies specializes in nuclear engineering and services. Klanik provides IT engineering consulting for digital and technological projects.
Most of these companies are headquartered in Marseille. A notable pattern is the strong presence of the Onet group, with Onet SA, Onet Technologies, Onet Propreté et Services, and Onet Accueil all featured on this list, indicating a significant local footprint for this diversified service provider.
| # | 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 |
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 | |||
| 3 |
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 | |||
| 4 |
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 | |||
| 5 |
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 | |||
| 6 |
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 | |||
| 7 |
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 | |||
| 8 |
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 | |||
| 9 |
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 | |||
| 10 |
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 | |||
| 11 |
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 | |||
| 12 |
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 | |||
| 13 |
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 | |||
| 14 |
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 | |||
| 15 |
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 | |||
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 |
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 | |||
| 17 |
Apave Sudeurope SAS
An individual & family services company based in Marseille, France, offering a variety of services to support individuals and families |
203 | |||
| 18 |
GIMSgims13.com
Specialized in preventive medicine, focusing on maintaining the health of all employees while addressing societal challenges through reflection and action |
197 | |||
| 19 |
AIDADOMIaidadomi.fr
AIDADOMI provides a wide range of professional and personalized services at home, including assistance for seniors, childcare, and household maintenance |
183 | |||
| 20 |
JLB Expertisesjlbexpertises.com
A French survey company specializing in agricultural and food products in West Africa, with expertise in cocoa, coffee, rice, and cargo surveys |
153 | |||
| 21 |
CERTICALLfacebook.com
Certicall, a subsidiary of the Iliad Group, operates a call center in Marseille providing commercial, technical assistance, and media support services |
153 | |||
| 22 |
All4homeall4home.fr
A home services company specializing in quality housekeeping and childcare, with 40 agencies across France since starting in 2006 |
135 | |||
| 23 |
C2C CONSEILSc2c-conseils.com
Groupe C2C AUDIT is a multi-generational team of accounting experts with diverse skills, experience, human qualities, and technological proficiency |
124 | |||
| 24 |
Sécurité industriellesecurite-industrielle.fr
A company specializing in industrial security services, including fire safety, with a focus on quality personnel and regulatory compliance |
124 | |||
| 25 | 102 | ||||
| 26 |
Crowe Ficoreccrowe.com
A global service provider offering financial accounting, audit, advisory, tax, risk consulting, and internal audit services to companies across all industries |
79 | |||
| 27 |
POLE SUDpolesud-it.fr
Digital services company providing tailored expertise for over 25 years, focusing on excellence, trust, and long-term partnerships with clients |
73 | |||
| 28 |
MARS Marketingmars-marketing.fr
A call center in Marseille providing customer relationship services in multiple languages, including sales, appointment setting, prospecting, crisis management, and more |
71 | |||
| 29 |
StarDust CTG Groupstardust-testing.com
StarDust supports clients in creating and launching digital solutions, providing testing services for mobile apps and websites to enhance user experience and ROI |
69 | |||
| 30 |
PROCLAIRproclair.com
Proclair offers quality and local cleaning services in various sectors with over 40 years of experience and 500 employees Services include cleaning, disinfection, and more |
69 | |||
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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 Marseille
- The largest companies in Marseille 1,534
- Multinational companies in Marseille 159
- Retail chains in Marseille 120
- Public sector organisations in Marseille 103
- Companies with in-house R&D in Marseille 89
- SaaS companies in Marseille 67
- Law Practice companies in Marseille 64
- Real Estate companies in Marseille 64
- Accounting firms in Marseille 62
- Accounting companies in Marseille 61
- Education providers in Marseille 59
- Software Development companies in Marseille 58
- Healthcare providers in Marseille 57
- Business Consulting and Services companies in Marseille 56
- Consulting firms in Marseille 55
- Manufacturers in Marseille 55
- Family-owned companies in Marseille 54
- IT Services and IT Consulting companies in Marseille 52
- IT services companies in Marseille 52
- Events Services companies in Marseille 51
- Critical infrastructure operators in Marseille 44
- Logistics companies in Marseille 44
- Distributors and wholesalers in Marseille 43
- Financial services firms in Marseille 42
The same list elsewhere in France
- Professional services firms in France 6,611
- 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 254
- 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 2,241
- Professional services firms in Lyon 265
- Professional services firms in Toulouse 139
- Professional services firms in Boulogne-Billancourt 102