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List of professional services firms in the Seine-Saint-Denis department

Tamtam tracks 71 professional services firms headquartered in the Seine-Saint-Denis department. This list ranks the 30 largest by number of employees on LinkedIn, led by SPIE Facilities, Randstad France and SPIE Building Solutions (France). Their median headcount is 250. Half of them were founded in 1999 or later. The most common headquarters are Saint-Denis (10), Montreuil (5) and Aubervilliers (4).

🇫🇷 Seine-Saint-Denis30 companiesUpdated Nov 12, 2026

These professional services firms in Seine-Saint-Denis mostly comprise mid-sized and large companies. Recurring activities include facilities management, human resources, and environmental services. This selection features SPIE Facilities, which maintains buildings and facilities with a focus on energy performance, and Randstad France, offering recruitment and HR management solutions. Also present are Groupe Institut de Soudure, providing joining technology services, and Solutions30 France, which delivers technological solutions in IT, telecom, and energy.

The companies on this list exhibit a concentration of headquarters in certain communes, with Saint-Denis and Aubervilliers being notable hubs. Several firms specialize in similar areas, such as the multiple entities under the Randstad and Veolia groups, indicating a strong presence of these larger corporate structures in the department.

#CompanyIndustryHeadquarters EmployeesFounded
1
SPIE Facilitiesspie.fr

Maintenance of buildings and facilities across France, focusing on energy performance, technical expertise, and sustainable facility management services.

Facilities Services 🇫🇷 Saint-Ouen-sur-Seine 2,066 2017
2
Randstad Francerandstad.fr

This company offers tailored recruitment and HR management solutions, connecting businesses with talent for various sectors including industry, IT, engineering, and finance.

Human Resources Services 🇫🇷 Saint-Denis 1,511 1973
3
SPIE Building Solutions (France)spie.fr

Specializing in reducing building carbon footprint through intelligent solutions and expertise, this organization promotes safer, connected, comfortable, and high-performing buildings

Facilities Services 🇫🇷 Saint-Ouen-sur-Seine 1,415 2003
4
Groupe Institut de Soudureisgroupe.com

Provides joining technology services, testing, inspection, and training worldwide, supporting design, manufacturing, and maintenance with safety and quality focus.

Mechanical Or Industrial Engineering 🇫🇷 Villepinte 1,262 1905
5
Randstad Inhouserandstad.fr

Providing dedicated onsite HR teams to industrial companies, managing recruitment, flexibility, and productivity to meet production goals efficiently.

Human Resources Services 🇫🇷 Saint-Denis 972 n/a
6
Groupe Randstad Francegrouperandstad.fr

Specialist in HR services, offering recruitment, integration, management, training, and mobility solutions to companies and candidates, with a strong focus on shaping the world of work

Human Resources Services 🇫🇷 Saint-Denis 903 n/a
7
Solutions30 Francesolutions30.com

The company provides technological solutions to individuals and businesses in Europe in areas such as IT, telecom, energy, connected devices, security, and facility management

IT Services and IT Consulting 🇫🇷 Saint-Denis 695 n/a
8
Hub Onehubone.fr

Hub One, a technology group, provides digital evolution services for businesses in various sectors They offer connectivity solutions for communication, networking, and mobility

Telecommunications 🇫🇷 Tremblay-en-France 645 2001
9
Veolia | Engineering & Consultingengineering-consulting.veolia.com

Consulting engineering and strategic assistance division specializing in designing sustainable solutions for public, industrial, and tertiary sectors, focusing on resource management and performance improvement

Environmental Services 🇫🇷 Aubervilliers 436 n/a
10
Veolia Industries Global Solutionsindustries.veolia.com

Specializes in energy efficiency and performance solutions, focusing on optimizing industrial energy use and sustainability practices.

Environmental Services 🇫🇷 Aubervilliers 417 1997
11
CORELIAcorelia.ai

CORELIA correlates data for clients, blending expertise with project complexity through IT and business alignment, emphasizing data's importance in all projects

IT Services and IT Consulting 🇫🇷 Saint-Denis 402 1985
12
Defense Environnement Servicesindustries.veolia.com

Specializes in industrial maintenance, facility management, and logistics for complex defense environments including production sites, offices, and military bases.

Environmental Services 🇫🇷 Aubervilliers 354 2009
13
Atalian Sécuritéatalian.fr

Specialized security company with a dedicated team collaborating with major French and international groups, offering a unique and cosmopolitan Security Journey

Security and Investigations 🇫🇷 Aubervilliers 315 1977
14
GIDEFgidef.org

A consulting firm offering professional reclassification support, engineering programs, competency assessments, education needs analysis, and social/economic studies for strategic decision-making

Professional Training and Coaching 🇫🇷 Rosny-sous-Bois 281 1994
15
Cantorcantor.fr

Cantor is a computer service and engineering company specializing in software and data engineering, including big data processing within strict deadlines

Software Development 🇫🇷 Neuilly-Plaisance 250 1996

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16
GLIgli.fr

Technical engineering and consultancy services for smart buildings focusing on energy efficiency, fire safety, cybersecurity, and electrical systems through project management and support.

Research Services 🇫🇷 Montreuil 250 1986
17
EMGgravitymedia.com

A leading provider of broadcast services and media solutions for live sports, entertainment, and events with a global presence

Media Production 🇫🇷 Saint-Denis 224 1983
18
ARTEMIS Group / 7 filialesgroupartemis.fr

Family-owned private security firm providing human guarding, mobile patrols, professional training, fire protection, electronic security, remote monitoring, and event hosting services across France.

Security and Investigations 🇫🇷 Saint-Denis 211 2010
19
INTERCOM Technologiesintercom-technologies.fr

Specialized in high-value project expertise and management, supporting strategy, providing expert assistance, and operating nearshore agency for quality and growth.

Telecommunications 🇫🇷 Rosny-sous-Bois 197 2005
20
LINKBYNETaccenture.com

A innovative company providing outsourcing and cloud computing solutions, focusing on digital infrastructure development, management, and security for business transformation

IT Services and IT Consulting 🇫🇷 Saint-Denis 196 2000
21
OGI - OMNIUM GÉNÉRAL D'INGENIERIEogi2.fr

OGI is a specialized engineering firm for public space development, offering a range of technical expertise for all aspects of project planning

Architecture and Planning 🇫🇷 Montreuil 190 1991
22
COTEBAarteliagroup.com

European leader in engineering and project management, specializing in construction, infrastructure, and environment projects with a focus on professionalism, ethics, and sustainability

Construction 🇫🇷 Saint-Denis 154 1961
23
aéroportuairesodaic.fr

An aviation and aerospace company headquartered in France, specializing in aircraft technologies and solutions within the industry

Aviation and Aerospace Component Manufacturing 🇫🇷 Tremblay-en-France 147 n/a
24
Groupe SI BUREAUTIQUE FRANCEsibureautique.com

Established in 2005, a group of entities offering tailored solutions in printing, telephony, IT, and digital services to improve workplace efficiency

IT Services and IT Consulting 🇫🇷 Montreuil 64 2005
25
SoftwareOne Francesoftwareone.com

Global provider of software and cloud solutions, specializing in license lifecycle management, migration, modernization, and digital transformation support.

IT Services and IT Consulting 🇫🇷 Saint-Ouen-sur-Seine 60 n/a
26
INEX BETinex.fr

Support architects and developers in designing sustainable, efficient buildings with expertise in HVAC, MEP engineering, green standards, and BIM innovation.

Construction 🇫🇷 Montreuil 54 1978
27
SARDEL Conseilsardel.fr

Identifies young talent, provides specialized mainframe technology training, and facilitates placement into prestigious organizations to ensure sustainable long-term employment for computer science graduates.

Software Development 🇫🇷 Noisy-le-Grand 54 2016
28
Altametrisaltametris.com

A French expert in generating geotechnical data for industrial infrastructure operators, specializing in 3D mapping, land surveys, BIM modeling, and more

IT Services and IT Consulting 🇫🇷 Saint-Denis 53 2017
29
ADENISadenis.fr

Innovative cybersecurity and IT services provider for small and medium-sized businesses, offering a competitive edge and future-oriented solutions to boost revenue

IT Services and IT Consulting 🇫🇷 Bagnolet 53 1999
30
AMOPRIM/AMODEVamodev.eu

Specialized in real estate project consulting for public actors, investors, and developers Services include auditing, project management, environmental assistance, and more

Real Estate 🇫🇷 Montreuil 49 2006

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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.

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