Tamtam Start free

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.

🇫🇷 Marseille30 companiesUpdated Nov 11, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
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

Business Consulting and Services 🇫🇷 Marseille 14,750 1860
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.

Accommodation and Food Services 🇫🇷 Marseille 2,899 1992
3
Onet Technologiesonet.fr

Expertise in nuclear engineering and services for reactor maintenance, dismantling, decommissioning, waste management, and training within the nuclear industry lifecycle.

Industrial Machinery Manufacturing 🇫🇷 Marseille 2,071 n/a
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.

Facilities Services 🇫🇷 Marseille 2,038 n/a
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.

Events Services 🇫🇷 Marseille 636 1994
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.

IT Services and IT Consulting 🇫🇷 Marseille 548 2011
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

Events Services 🇫🇷 Marseille 483 n/a
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

Engineering Services 🇫🇷 Marseille 470 1957
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

Automation Machinery Manufacturing 🇫🇷 Marseille 428 1959
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.

IT Services and IT Consulting 🇫🇷 Marseille 349 n/a
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.

Government Administration 🇫🇷 Marseille 336 n/a
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

Individual and Family Services 🇫🇷 Marseille 331 1997
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

Professional Training and Coaching 🇫🇷 Marseille 286 2019
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.

Business Consulting and Services 🇫🇷 Marseille 220 2009
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

Human Resources Services 🇫🇷 Marseille 219 2005

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.

Get more companies, free
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

Business Consulting and Services 🇫🇷 Marseille 204 2013
17
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 🇫🇷 Marseille 203 n/a
18
GIMSgims13.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 🇫🇷 Marseille 197 1948
19
AIDADOMIaidadomi.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 🇫🇷 Marseille 183 2006
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

Maritime Transportation 🇫🇷 Marseille 153 1883
21
CERTICALLfacebook.com

Certicall, a subsidiary of the Iliad Group, operates a call center in Marseille providing commercial, technical assistance, and media support services

Telecommunications 🇫🇷 Marseille 153 n/a
22
All4homeall4home.fr

A home services company specializing in quality housekeeping and childcare, with 40 agencies across France since starting in 2006

Individual and Family Services 🇫🇷 Marseille 135 2005
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

Accounting 🇫🇷 Marseille 124 2004
24
Sécurité industriellesecurite-industrielle.fr

A company specializing in industrial security services, including fire safety, with a focus on quality personnel and regulatory compliance

Security and Investigations 🇫🇷 Marseille 124 1981
25
EMPLempl.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 🇫🇷 Marseille 102 1983
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

Accounting 🇫🇷 Marseille 79 1987
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

IT Services and IT Consulting 🇫🇷 Marseille 73 1996
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

Advertising Services 🇫🇷 Marseille 71 1996
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

Internet Publishing 🇫🇷 Marseille 69 n/a
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

Environmental Services 🇫🇷 Marseille 69 1976

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.

Build your own list, free

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 same list elsewhere in France