The largest companies in Clamart are primarily mid-sized firms, with a notable presence in retail and specialized services. Optic 2000, a leading optical retailer, and Retail Renault Group, a European distributor of Renault vehicles, are among the largest employers. Other significant companies include SADE Télécom, which deploys digital and energy networks, and MicroPort CRM, a developer of heart failure management platforms.
A recurring pattern observed is the strong focus on retail, particularly in optical goods and automotive sales, alongside a concentration of companies providing technical and specialized services. Many of these firms, such as Lissac (founded 1919) and Vallée Sud Habitat (founded 1949), have a long operational history, indicating established businesses in the region.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Optic 2000optic2000.com
A leading optical retailer, offering a wide range of visual solutions and services through its extensive network of stores, focusing on customer needs and health. |
2,724 | |||
| 2 |
Retail Renault Grouprenaultretailgroup.com
Leading European distributor of Renault Group vehicles, offering sales, associated services, and after-sales support across multiple countries. |
2,413 | |||
| 3 |
SADE Télécomensio.eu
Specialized teams deploy digital and energy networks, offering turnkey solutions, services, and maintenance with sustainable and safe practices. |
1,063 | |||
| 4 |
MicroPort CRMmicroport.com
Develops a comprehensive heart failure management platform, combining device therapies with monitoring technologies, covering diagnosis, treatment, and long-term care globally. |
497 | |||
| 5 | 401 | ||||
| 6 |
Samexsamex92.fr
Samex, a subsidiary of Dalkia group, specializes in operating Multi-Technical and HVAC systems, as well as designing and implementing heating, ventilation, air conditioning, and plumbing projects |
309 | |||
| 7 |
Hôpital National d’Instruction des Armées Percyhiapercy.sante.defense.gouv.fr
Military hospital providing trauma care, critical medical services, and support to armed forces and public health with 300+ beds. |
298 | |||
| 8 |
Ville de Clamartclamart.fr
Local government managing a suburban city near Paris, part of Vallée Sud Grand Paris, with international twin town partnerships. |
246 | |||
| 9 |
Audio 2000audio2000.fr
Network of state-certified independent audiologists providing personalized hearing care, innovative products, and preventive services across numerous centers. |
101 | |||
| 10 |
MIRASmiras.network
An initiative promoting trade exchange, strategic partnerships, and mutual interests among Arab entrepreneurs and investors on an international scale |
78 | |||
| 11 |
Vallée Sud Habitatvalleesudhabitat.fr
Social housing provider and property manager in Clamart and Châtillon, ensuring high service quality with 95% tenant satisfaction Leading social landlord in Île-de-France |
70 | |||
| 12 |
Celsius Energycelsiusenergy.com
Connecting buildings to continuous renewable energy from the earth to meet heating and cooling needs through seasonal heat storage. |
65 | |||
| 13 |
CTMNC - Centre Technique de Matériaux Naturels de Constructionctmnc.fr
The CTMNC develops quality and innovation for manufacturers of clay and natural stone construction materials through testing, inspections, R&D, and representation in standardization committees |
64 | |||
| 14 |
Il n'y a pas d'heure pour écrire
Specialists in content strategy, enhancing website visibility and managing e-reputation through editorial guidelines, storytelling, branding, content creation, SEO strategy, and reputation management |
51 | |||
| 15 |
KURY Ingénieriekury.fr
Engineering firm specializing in nuclear design, safety analysis, and optimization of new and existing nuclear power plants internationally. |
50 | |||
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 |
Mediaxe Formationmediaxe.fr
Professional training company offering interactive and operational courses for future Clinical Research Associates (CRAs), providing personalized coaching and networking opportunities for career advancement |
21 | |||
| 17 |
ARPEIJE EMPLOIarpeije.fr
Facilitation of professional meetings, recruitment assistance, integration support, and HR-themed events promoting knowledge sharing among local businesses. |
18 | |||
| 18 |
Théâtre Jean Arptheatrejeanarp.com
A multidisciplinary theater in Clamart supporting emerging puppetry arts, including the renowned Nuit de la marionnette event, and merging with Théâtre de Châtillon |
17 | |||
| 19 |
STNA - Volkswagen Clamartvolkswagen-clamart.com
A Volkswagen dealership in Clamart offering new and used vehicle sales, commercial vehicles, fleet services, financing solutions, and after-sales services Visit website for more information |
14 | |||
| 20 |
DAC 92 Sud Osmosedac92sud.fr
The organization provides support to health, social, and medical professionals facing complex situations with individuals facing multiple difficulties in southern Hauts-de-Seine |
13 | |||
| 21 |
Gadol Les Indépendants (Groupement d'achats des opticiens lunetiers)groupement-optic2000.fr
A central purchasing group created by opticians in 1962, supporting independent optical stores with personalized services to improve performance |
10 | |||
| 22 |
Clamart Rugby 92clamartrugby92.fr
Clamart Rugby 92 is a rugby club with a rich history, fostering rugby values and producing talented players from youth to senior levels |
8 | |||
| 23 |
Opteamise Consultingopteamise-consulting.com
Specialized company in transportation sector, assisting operators, maintainers, and authorities in optimizing and adapting industrial organizations for project success |
6 | |||
| 24 |
IPA PARISipa-paris.fr
A French leader in transforming DuPont™ Corian resin, crafting custom design furniture for large clients, professionals, and individuals with quality certification |
5 | |||
| 25 |
hubincomhubincom.com
A video production agency with over 20 years of experience in digital communication, providing live and on-demand video services for various clients |
5 | |||
| 26 |
OFFRE DE PRÊTS ENTRE PARTICULIERS RAPIDE ET FIABLE.facebook.com
Offering quick and reliable loans to individuals in need, providing financing for various purposes such as projects, property purchase, debt consolidation, and more Contact for more information |
3 | |||
| 27 |
Cabinet Raoult, Abeille Assurances et Afer à Clamart, Chaville et Jouy-en-Josasagences.abeille.fr
An insurance agency in Clamart and Chaville specializing in various insurance policies, with a focus on providing tailored coverage for healthcare professionals |
3 | |||
| 28 |
Full Inclusion : Handi-Numérique & Handi-Mindsetfull-inclusion.org
Transforming obstacles into opportunities, Full Inclusion offers expertise in digital inclusion, podcasts on disability & personal development, accessibility solutions, and support for education Join the digital hero journey |
3 | |||
| 29 |
Yemma Production
Yemma is a production agency specializing in creating various types of content for clients |
2 | |||
| 30 |
MAKEHITECmakehitec.com
Specializes in software development, cybersecurity, embedded systems, cloud and IoT architecture, with applications in aeronautical, automotive, and defense sectors. |
2 | |||
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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.
The same list elsewhere in France
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