# The 30 largest professional services firms in Marseille
Tamtam tracks 123 professional services firms headquartered in Marseille. This list ranks the 30 largest by number of employees on LinkedIn, led by Onet SA, Catering International & Services CIS and Onet Technologies. Their median headcount is 219. Half of them were founded in 1996 or later.
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 Propret茅 et Services, and Onet Accueil all featured on this list, indicating a significant local footprint for this diversified service provider.
馃嚝馃嚪 Marseille 路 30 companies 路 Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Onet SA](https://www.tamtam.ai/c/onet-sa) (groupeonet.com)
A family service group with 74,000 employees in 8 countries, offering a wide range of services including cleaning, security, engineering, and maintenance | Business Consulting and Services | 馃嚝馃嚪 Marseille | 14,750 | 1860 |
| 2 | [Catering International & Services CIS](https://www.tamtam.ai/c/catering-international-and-services-cis) (cis-integratedservices.com)
Providing integrated services and turnkey solutions ensuring well-being and safety for residents in remote offshore and onshore project sites worldwide. | Accommodation and Food Services | 馃嚝馃嚪 Marseille | 2,899 | 1992 |
| 3 | [Onet Technologies](https://www.tamtam.ai/c/onet-technologies) (onet.fr)
Expertise in nuclear engineering and services for reactor maintenance, dismantling, decommissioning, waste management, and training within the nuclear industry lifecycle. | Industrial Machinery Manufacturing | 馃嚝馃嚪 Marseille | 2,071 | |
| 4 | [Onet Propret茅 et Services](https://www.tamtam.ai/c/onet-proprete-et-services) (onet.fr)
Maintaining hygiene and cleanliness in various environments, including workplaces, public spaces, and transport areas, ensuring they are clean, healthy, and pleasant. | Facilities Services | 馃嚝馃嚪 Marseille | 2,038 | |
| 5 | [GROUPE ETIC](https://www.tamtam.ai/c/groupe-etic) (etic-groupe.com)
Outsourced reception services, event staffing, physical security monitoring, customer relationship management via call centers, and professional fire safety audit and training programs. | Events Services | 馃嚝馃嚪 Marseille | 636 | 1994 |
| 6 | [Klanik](https://www.tamtam.ai/c/klanik) (klanik.com)
Provides IT engineering consulting, assisting partners with digital and technological projects, leveraging expert talent across various technological verticals globally for digital transformation. | IT Services and IT Consulting | 馃嚝馃嚪 Marseille | 548 | 2011 |
| 7 | [Onet Accueil](https://www.tamtam.ai/c/onet-accueil) (onet.fr)
The company specializes in providing reception services that are both pleasant and useful, facilitating efficient connections between different stakeholders on site | Events Services | 馃嚝馃嚪 Marseille | 483 | |
| 8 | [TPF INGENIERIE](https://www.tamtam.ai/c/tpf-ingenierie) (tpf-i.fr)
An engineering company specializing in Building, Infrastructure, Water/Environment, Energy/Maintenance sectors with a collaborative and innovative approach to project development | Engineering Services | 馃嚝馃嚪 Marseille | 470 | 1957 |
| 9 | [CMR Group](https://www.tamtam.ai/c/cmr-group) (cmr-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 | Automation Machinery Manufacturing | 馃嚝馃嚪 Marseille | 428 | 1959 |
| 10 | [iQanto](https://www.tamtam.ai/c/iqanto) (iqanto.net)
Industrial transformation through automation, robotics, AI, and cybersecurity to improve processes and deploy intelligent systems across diverse sectors for small and large enterprises. | IT Services and IT Consulting | 馃嚝馃嚪 Marseille | 349 | |
| 11 | [Chambre de Commerce et d'Industrie Marseille-Provence](https://www.tamtam.ai/c/chambre-de-commerce-et-d-industrie-marseille-provence) (cciamp.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. | Government Administration | 馃嚝馃嚪 Marseille | 336 | |
| 12 | [Home-Services](https://www.tamtam.ai/c/home-services) (home-services.com)
Home Services provides home assistance in the Var, Bouches du Rh么ne, and Vaucluse regions, offering services like childcare, elderly care, housekeeping, and more | Individual and Family Services | 馃嚝馃嚪 Marseille | 331 | 1997 |
| 13 | [l'Escale](https://www.tamtam.ai/c/l-escale) (lescale.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 | Professional Training and Coaching | 馃嚝馃嚪 Marseille | 286 | 2019 |
| 14 | [Seres Technologies](https://www.tamtam.ai/c/seres-technologies) (seres-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. | Business Consulting and Services | 馃嚝馃嚪 Marseille | 220 | 2009 |
| 15 | [Job Link](https://www.tamtam.ai/c/job-link) (joblink.fr)
A specialist recruitment agency in France with 16 branches, offering selective and efficient recruitment services to clients and connecting candidates with desired jobs | Human Resources Services | 馃嚝馃嚪 Marseille | 219 | 2005 |
| 16 | [FATEC Group](https://www.tamtam.ai/c/fatec-group) (fatec-group.com)
A leading independent fleet management company in France, providing transparent services for a range of clients, with expertise in responsible mobility | Business Consulting and Services | 馃嚝馃嚪 Marseille | 204 | 2013 |
| 17 | [Apave Sudeurope SAS](https://www.tamtam.ai/c/apave-sudeurope-sas)
An individual & family services company based in Marseille, France, offering a variety of services to support individuals and families | Individual and Family Services | 馃嚝馃嚪 Marseille | 203 | |
| 18 | [GIMS](https://www.tamtam.ai/c/gims) (gims13.com)
Specialized in preventive medicine, focusing on maintaining the health of all employees while addressing societal challenges through reflection and action | Business Consulting and Services | 馃嚝馃嚪 Marseille | 197 | 1948 |
| 19 | [AIDADOMI](https://www.tamtam.ai/c/aidadomi) (aidadomi.fr)
AIDADOMI provides a wide range of professional and personalized services at home, including assistance for seniors, childcare, and household maintenance | Individual and Family Services | 馃嚝馃嚪 Marseille | 183 | 2006 |
| 20 | [JLB Expertises](https://www.tamtam.ai/c/jlb-expertises) (jlbexpertises.com)
A French survey company specializing in agricultural and food products in West Africa, with expertise in cocoa, coffee, rice, and cargo surveys | Maritime Transportation | 馃嚝馃嚪 Marseille | 153 | 1883 |
| 21 | [CERTICALL](https://www.tamtam.ai/c/certicall) (facebook.com)
Certicall, a subsidiary of the Iliad Group, operates a call center in Marseille providing commercial, technical assistance, and media support services | Telecommunications | 馃嚝馃嚪 Marseille | 153 | |
| 22 | [All4home](https://www.tamtam.ai/c/all4home) (all4home.fr)
A home services company specializing in quality housekeeping and childcare, with 40 agencies across France since starting in 2006 | Individual and Family Services | 馃嚝馃嚪 Marseille | 135 | 2005 |
| 23 | [C2C CONSEILS](https://www.tamtam.ai/c/c2c-conseils) (c2c-conseils.com)
Groupe C2C AUDIT is a multi-generational team of accounting experts with diverse skills, experience, human qualities, and technological proficiency | Accounting | 馃嚝馃嚪 Marseille | 124 | 2004 |
| 24 | [S茅curit茅 industrielle](https://www.tamtam.ai/c/securite-industrielle) (securite-industrielle.fr)
A company specializing in industrial security services, including fire safety, with a focus on quality personnel and regulatory compliance | Security and Investigations | 馃嚝馃嚪 Marseille | 124 | 1981 |
| 25 | [EMPL](https://www.tamtam.ai/c/empl) (empl.fr)
A global expert in container maintenance, vehicle inspections, logistics, cargo surveys, and certification, utilizing innovative computer tools to provide high-quality services worldwide | Transportation, Logistics, Supply Chain and Storage | 馃嚝馃嚪 Marseille | 102 | 1983 |
| 26 | [Crowe Ficorec](https://www.tamtam.ai/c/crowe-ficorec) (crowe.com)
A global service provider offering financial accounting, audit, advisory, tax, risk consulting, and internal audit services to companies across all industries | Accounting | 馃嚝馃嚪 Marseille | 79 | 1987 |
| 27 | [POLE SUD](https://www.tamtam.ai/c/pole-sud-marseille) (polesud-it.fr)
Digital services company providing tailored expertise for over 25 years, focusing on excellence, trust, and long-term partnerships with clients | IT Services and IT Consulting | 馃嚝馃嚪 Marseille | 73 | 1996 |
| 28 | [MARS Marketing](https://www.tamtam.ai/c/mars-marketing) (mars-marketing.fr)
A call center in Marseille providing customer relationship services in multiple languages, including sales, appointment setting, prospecting, crisis management, and more | Advertising Services | 馃嚝馃嚪 Marseille | 71 | 1996 |
| 29 | [StarDust CTG Group](https://www.tamtam.ai/c/stardust-ctg-group) (stardust-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 | Internet Publishing | 馃嚝馃嚪 Marseille | 69 | |
| 30 | [PROCLAIR](https://www.tamtam.ai/c/proclair) (proclair.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 | Environmental Services | 馃嚝馃嚪 Marseille | 69 | 1976 |
## 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.
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Source: https://www.tamtam.ai/l/professional-services-firms-marseille