| # | Company | Employees |
|---|---|---|
| 1 | 16,616 | |
| 2 |
EFREI - Grande école du numériqueefrei.fr
This private engineering school trains students in computer science and digital technology, offering 12 master's specializations, with some courses delivered in English. |
2,240 |
| 3 |
Gustave Roussygustaveroussy.fr
A leading cancer center in Europe, specializing in prevention, treatment, research, and education for patients, with two locations in Grand Paris |
2,076 |
| 4 |
Ville de Villejuifvillejuif.fr
Local government organization in Villejuif, France, overseeing city affairs including population management, municipal services, and leadership under Mayor Claudine Cordillot (PCF) |
267 |
| 5 |
SupBiotech, école de biotechnologiessupbiotech.fr
Five-year biotechnology engineering program combining academic fundamentals, projects, and internships for careers in health, pharma, agro-food, cosmetics, bioinformatics, and environment. |
246 |
| 6 |
Orano Medoranomed.com
Develops new processes for producing lead-212, a rare radioactive isotope, for targeted alpha therapy against cancer cells, limiting impact on healthy cells. |
233 |
| 7 | 174 | |
| 8 | 156 | |
| 9 |
Philiaphilia-asso.org
The organization in France supports asylum seekers, refugees, and marginalized individuals through social support, job access, cultural integration, art therapy, and training programs |
155 |
| 10 |
aivancity School of AI & Data for Business & Societyaivancity.ai
Educates future 'AIgineers' in artificial intelligence, business, and ethics to leverage data for industry 4.0 and societal progress responsibly. |
127 |
| 11 |
Fondation ARC pour la recherche sur le cancerfondation-arc.org
Driving cancer research forward through strategic direction, funding innovative initiatives, accelerating promising projects, and fostering collaborations to ultimately defeat cancer |
90 |
| 12 |
CESP - Centre de recherche en Epidémiologie et Santé des Populationscesp.inserm.fr
The company focuses on major health issues, including psychiatry, cancer, chronic diseases, and primary care, conducting epidemiological research with an integrative approach |
86 |
| 13 |
Stilla Technologiesstillatechnologies.com
Development and provision of advanced digital PCR technology for genetic analysis, cancer research, infectious disease, and environmental testing applications. |
84 |
| 14 |
GHT Psy Sud Parispsysudparis.fr
Mental health institutions collaborate to improve psychiatric care and life pathways for residents in Hauts-de-Seine and Val de Marne. |
83 |
| 15 |
YA+Kyaplusk.fr
An organization passionate about collective projects, facilitating collaborative meetings, learning journeys, and building projects for inclusive and optimistic human organizations |
69 |
| 16 |
Valerio Therapeuticsvaleriotx.com
Development of synthetic single-domain antibody therapies with deep tissue penetration for complex diseases, focusing on rapid clinical advancement and strategic partnerships. |
52 |
| 17 |
Sculpteosculpteo.com
A leading 3D printing and laser cutting service dedicated to growing the industry's adoption, with factories in Paris and San Francisco |
50 |
| 18 |
SDEL Railsdel-transport-en-commun.fr
SDEL Rail, a subsidiary of VINCI Energies, specializes in delivering high and low voltage projects for SNCF with a strong focus on client partnership and team proximity |
47 |
| 19 |
ILCI Business Schoolilci-education.fr
Business school focused on languages, marketing, international trade, purchasing, supply chain, luxury, and tourism programs since 2004. |
47 |
| 20 |
SDEL Transport en Communsdel-transport-en-commun.fr
A subsidiary of VINCI Energies, specializing in low and very low voltage electrical systems in railway environments for design and implementation |
39 |
| 21 |
SEPEFREI Junior-Entreprisesepefrei.fr
Provides IT and telecommunications development and consulting services including mobile apps, websites, software, Excel macros, and network setup advice. |
37 |
| 22 |
Predilifepredilife.com
Develops and markets medical devices for predictive health assessments, focusing on breast cancer and multi-pathology risks to improve preventive and personalized care. |
33 |
| 23 |
SBconsultsbconsult.fr
SBConsult is a Junior-Initiative of SupBiotech, providing motivated students for outsourcing projects in biotechnology, offering diverse profiles for company needs |
31 |
| 24 |
Les Paveurs de Montrougeeurovia.fr
A company specializing in urban development and public works in the southern Paris region, with a focus on sustainable development and quality service for clients |
29 |
| 25 |
Institut Français de Bioinformatiqueifb-elixir.fr
IFB is a national bioinformatics service infrastructure coordinating platforms from major research organizations, universities, and institutes to improve scientific impact and support various initiatives in bioinformatics |
27 |
| 26 |
ValoTecvalotec.fr
Specializing in innovative devices across industries, ValoTec supports R&D and production projects, especially in medical devices, with added expertise in diabetes research |
19 |
| 27 | 14 | |
| 28 |
ESIGETEL - EFREI Parisesigetel.fr
A leading engineering school forming operational engineers in IT and telecommunications fields, focusing on practical training, teamwork projects, and internships for competitiveness in the job market |
14 |
| 29 |
WEI Efrei
Association organizing integration events for new students at Efrei, a digital and innovation school in Villejuif, through a month of activities and a weekend event |
10 |
| 30 |
RHU ORGANOMICrhu-organomic.com
Innovative project creating 3D organoid models of patient tumors to individualize treatment for metastatic digestive cancers Led by Fanny Jaulin |
8 |
| 31 |
US Villejuif Volley-Ball 94villejuif-volley.fr
The company is looking for players, coaches, and trainers of all levels to join their volleyball project focused on performance, progress, and community |
8 |
| 32 |
Ateliers Chevalieratchevalier.fr
Family-owned company founded in 1961, specializing in aluminum joinery and various locksmith services for construction professionals Offers supply, installation, and delivery throughout France |
8 |
| 33 |
Signe Distinctifs-distinctif.fr
Signe Distinctif offers support in marketing production for major advertisers and agencies, specializing in printed materials, logistics, and advice for effective marketing campaigns |
7 |
| 34 |
ADN Services SARL
The company specializes in transporting goods under 35 tons, providing last mile logistics services, and offering vehicle repairs and sales of spare parts |
7 |
| 35 |
ESPACE CONGRES LES ESSELIERESlesesselieres.fr
Event space offering 8 versatile halls for various events Includes catering, entertainment, audiovisual, and logistics services Visit website for more information |
7 |
| 36 |
Bureau Des Sports EFREI Parisbds-efrei.fr
Manages most sports activities for the school, organizing events, practices, and competitions for students to participate in various athletic pursuits. |
6 |
| 37 |
EverImmuneeverimmune.com
A biotechnology company specializing in developing live biotherapeutic products for microbiota oncology to enhance immune response in cancer patients |
4 |
| 38 |
aratinga.bioaratinga.bio
A preclinical stage company developing novel immunotherapies for cancer, addressing unmet medical needs with proprietary platform targeting both hematological and solid tumors |
3 |
| 39 |
USV TENNISusvtennis.com
A tennis club with 46 years of experience in Villejuif, offering quality coaching, state-of-the-art facilities, and a range of programs for all ages and skill levels |
3 |
| 40 |
Heyu - Inclusion, handicap & sensibilisations immersivesheyu.fr
The company offers innovative and learner-centered training programs focused on societal issues, such as disability, domestic violence, diversity, and inclusion |
3 |
| 41 | 3 | |
| 42 |
Law for goodlawforgood.eu
Lawforgood is a small consulting firm specialized in compliance and business ethics, providing support in defining needs, compliance planning, and strategic implementation |
2 |
| 43 |
Ribonexusthegoonblog.com
A biotech company focused on creating innovative therapies to combat drug resistance in cancer cells |
2 |
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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 Oct 24, 2026.
The same list elsewhere in France
- The largest companies in France 75,805
- The largest companies in Île-de-France 30,863
- The largest companies in Auvergne-Rhône-Alpes 8,971
- The largest companies in Provence-Alpes-Côte d'Azur 5,836
- The largest companies in Occitanie 4,823
- The largest companies in Grand Est 4,506
- The largest companies in Nouvelle-Aquitaine 4,424
- The largest companies in Hauts-de-France 3,752
- The largest companies in Pays de la Loire 3,573
- The largest companies in Brittany 2,535
- The largest companies in Normandy 1,814
- The largest companies in Bourgogne-Franche-Comté 1,549
- The largest companies in Centre-Val de Loire 1,385
- The largest companies in Paris 19,499
- The largest companies in Lyon 2,238
- The largest companies in Marseille 1,366
- The largest companies in Toulouse 1,331
- The largest companies in Bordeaux 928
- The largest companies in Nantes 796
- The largest companies in Lille 731
- The largest companies in Boulogne-Billancourt 701
- The largest companies in Montpellier 633
- The largest companies in Aix-en-Provence 571
- The largest companies in Strasbourg 547