# The 30 largest companies in Clamart

Tamtam tracks 30 companies headquartered in Clamart. This list ranks all of them by number of employees on LinkedIn, led by Optic 2000, Retail Renault Group and SADE Télécom. Their median headcount is 50. Half of them were founded in 2000 or later.

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.

🇫🇷 Clamart · 30 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Optic 2000](https://www.tamtam.ai/c/optic-2000) (optic2000.com)<br>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. | Retail | 🇫🇷 Clamart | 2,724 | 1969 |
| 2 | [Retail Renault Group](https://www.tamtam.ai/c/retail-renault-group) (renaultretailgroup.com)<br>Leading European distributor of Renault Group vehicles, offering sales, associated services, and after-sales support across multiple countries. | Retail Motor Vehicles | 🇫🇷 Clamart | 2,413 | 1997 |
| 3 | [SADE Télécom](https://www.tamtam.ai/c/sade-telecom) (ensio.eu)<br>Specialized teams deploy digital and energy networks, offering turnkey solutions, services, and maintenance with sustainable and safe practices. | Telecommunications | 🇫🇷 Clamart | 1,063 | 2008 |
| 4 | [MicroPort CRM](https://www.tamtam.ai/c/microport-crm) (microport.com)<br>Develops a comprehensive heart failure management platform, combining device therapies with monitoring technologies, covering diagnosis, treatment, and long-term care globally. | Medical Equipment Manufacturing | 🇫🇷 Clamart | 497 |  |
| 5 | [Lissac](https://www.tamtam.ai/c/lissac) (lissac.fr)<br>French optical retailer since 1919. Offers eyeglasses, including custom-made, with technical expertise. Collaborates with health professionals. Provides jobs, stores, and visual health information. | Retail | 🇫🇷 Clamart | 401 | 1919 |
| 6 | [Samex](https://www.tamtam.ai/c/samex) (samex92.fr)<br>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 | Environmental Services | 🇫🇷 Clamart | 309 |  |
| 7 | [Hôpital National d’Instruction des Armées Percy](https://www.tamtam.ai/c/hopital-national-d-instruction-des-armees-percy) (hiapercy.sante.defense.gouv.fr)<br>Military hospital providing trauma care, critical medical services, and support to armed forces and public health with 300+ beds. | Hospitals and Health Care | 🇫🇷 Clamart | 298 |  |
| 8 | [Ville de Clamart](https://www.tamtam.ai/c/ville-de-clamart) (clamart.fr)<br>Local government managing a suburban city near Paris, part of Vallée Sud Grand Paris, with international twin town partnerships. | Government Administration | 🇫🇷 Clamart | 246 |  |
| 9 | [Audio 2000](https://www.tamtam.ai/c/audio-2000) (audio2000.fr)<br>Network of state-certified independent audiologists providing personalized hearing care, innovative products, and preventive services across numerous centers. | Wellness and Fitness Services | 🇫🇷 Clamart | 101 | 1999 |
| 10 | [MIRAS](https://www.tamtam.ai/c/miras) (miras.network)<br>An initiative promoting trade exchange, strategic partnerships, and mutual interests among Arab entrepreneurs and investors on an international scale | International Affairs | 🇫🇷 Clamart | 78 | 2021 |
| 11 | [Vallée Sud Habitat](https://www.tamtam.ai/c/vallee-sud-habitat) (valleesudhabitat.fr)<br>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 | Real Estate | 🇫🇷 Clamart | 70 | 1949 |
| 12 | [Celsius Energy](https://www.tamtam.ai/c/celsius-energy) (celsiusenergy.com)<br>Connecting buildings to continuous renewable energy from the earth to meet heating and cooling needs through seasonal heat storage. | Renewable Energy Equipment Manufacturing | 🇫🇷 Clamart | 65 | 2019 |
| 13 | [CTMNC - Centre Technique de Matériaux Naturels de Construction](https://www.tamtam.ai/c/ctmnc-centre-technique-de-materiaux-naturels-de-construction) (ctmnc.fr)<br>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 | Construction | 🇫🇷 Clamart | 64 | 1957 |
| 14 | [Il n'y a pas d'heure pour écrire](https://www.tamtam.ai/c/il-n-y-a-pas-d-heure-pour-ecrire)<br>Specialists in content strategy, enhancing website visibility and managing e-reputation through editorial guidelines, storytelling, branding, content creation, SEO strategy, and reputation management | Advertising Services | 🇫🇷 Clamart | 51 |  |
| 15 | [KURY Ingénierie](https://www.tamtam.ai/c/kury-ingenierie) (kury.fr)<br>Engineering firm specializing in nuclear design, safety analysis, and optimization of new and existing nuclear power plants internationally. | Oil and Gas | 🇫🇷 Clamart | 50 | 2000 |
| 16 | [Mediaxe Formation](https://www.tamtam.ai/c/mediaxe-formation) (mediaxe.fr)<br>Professional training company offering interactive and operational courses for future Clinical Research Associates (CRAs), providing personalized coaching and networking opportunities for career advancement | Professional Training and Coaching | 🇫🇷 Clamart | 21 | 2010 |
| 17 | [ARPEIJE EMPLOI](https://www.tamtam.ai/c/arpeije-emploi) (arpeije.fr)<br>Facilitation of professional meetings, recruitment assistance, integration support, and HR-themed events promoting knowledge sharing among local businesses. | Business Consulting and Services | 🇫🇷 Clamart | 18 | 1981 |
| 18 | [Théâtre Jean Arp](https://www.tamtam.ai/c/theatre-jean-arp) (theatrejeanarp.com)<br>A multidisciplinary theater in Clamart supporting emerging puppetry arts, including the renowned Nuit de la marionnette event, and merging with Théâtre de Châtillon | Performing Arts | 🇫🇷 Clamart | 17 |  |
| 19 | [STNA - Volkswagen Clamart](https://www.tamtam.ai/c/stna-volkswagen-clamart) (volkswagen-clamart.com)<br>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 | Manufacturing | 🇫🇷 Clamart | 14 | 1974 |
| 20 | [DAC 92 Sud Osmose](https://www.tamtam.ai/c/dac-92-sud-osmose) (dac92sud.fr)<br>The organization provides support to health, social, and medical professionals facing complex situations with individuals facing multiple difficulties in southern Hauts-de-Seine | Health and Human Services | 🇫🇷 Clamart | 13 | 2020 |
| 21 | [Gadol Les Indépendants (Groupement d'achats des opticiens lunetiers)](https://www.tamtam.ai/c/gadol-les-independants-groupement-d-achats-des-opticiens-lunetiers) (groupement-optic2000.fr)<br>A central purchasing group created by opticians in 1962, supporting independent optical stores with personalized services to improve performance | Retail | 🇫🇷 Clamart | 10 |  |
| 22 | [Clamart Rugby 92](https://www.tamtam.ai/c/clamart-rugby-92) (clamartrugby92.fr)<br>Clamart Rugby 92 is a rugby club with a rich history, fostering rugby values and producing talented players from youth to senior levels | Spectator Sports | 🇫🇷 Clamart | 8 | 1963 |
| 23 | [Opteamise Consulting](https://www.tamtam.ai/c/opteamise-consulting) (opteamise-consulting.com)<br>Specialized company in transportation sector, assisting operators, maintainers, and authorities in optimizing and adapting industrial organizations for project success | Business Consulting and Services | 🇫🇷 Clamart | 6 | 2018 |
| 24 | [IPA PARIS](https://www.tamtam.ai/c/ipa-paris) (ipa-paris.fr)<br>A French leader in transforming DuPont™ Corian resin, crafting custom design furniture for large clients, professionals, and individuals with quality certification | Retail Art Supplies | 🇫🇷 Clamart | 5 | 2010 |
| 25 | [hubincom](https://www.tamtam.ai/c/hubincom) (hubincom.com)<br>A video production agency with over 20 years of experience in digital communication, providing live and on-demand video services for various clients | Media Production | 🇫🇷 Clamart | 5 |  |
| 26 | [OFFRE DE PRÊTS ENTRE PARTICULIERS RAPIDE ET FIABLE.](https://www.tamtam.ai/c/offre-de-prets-entre-particuliers-rapide-et-fiable) (facebook.com)<br>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 | Banking | 🇫🇷 Clamart | 3 |  |
| 27 | [Cabinet Raoult, Abeille Assurances et Afer à Clamart, Chaville et Jouy-en-Josas](https://www.tamtam.ai/c/cabinet-raoult-abeille-assurances-et-afer-a-clamart-chaville-et-jouy-en-josas) (agences.abeille.fr)<br>An insurance agency in Clamart and Chaville specializing in various insurance policies, with a focus on providing tailored coverage for healthcare professionals | Insurance | 🇫🇷 Clamart | 3 | 1982 |
| 28 | [Full Inclusion : Handi-Numérique & Handi-Mindset](https://www.tamtam.ai/c/full-inclusion-handi-numerique-and-handi-mindset) (full-inclusion.org)<br>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 | Non-profit Organizations | 🇫🇷 Clamart | 3 | 2022 |
| 29 | [Yemma Production](https://www.tamtam.ai/c/yemma-production)<br>Yemma is a production agency specializing in creating various types of content for clients | Media Production | 🇫🇷 Clamart | 2 | 2023 |
| 30 | [MAKEHITEC](https://www.tamtam.ai/c/makehitec) (makehitec.com)<br>Specializes in software development, cybersecurity, embedded systems, cloud and IoT architecture, with applications in aeronautical, automotive, and defense sectors. | IT Services and IT Consulting | 🇫🇷 Clamart | 2 | 2017 |

## 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

- [The largest companies in France](https://www.tamtam.ai/l/largest-companies-france) (90,812)
- [The largest companies in Île-de-France](https://www.tamtam.ai/l/largest-companies-ile-de-france) (36,142)
- [The largest companies in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/largest-companies-auvergne-rhone-alpes) (11,033)
- [The largest companies in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/largest-companies-provence-alpes-cote-dazur) (6,698)
- [The largest companies in Occitanie](https://www.tamtam.ai/l/largest-companies-occitanie) (5,767)
- [The largest companies in Grand Est](https://www.tamtam.ai/l/largest-companies-grand-est) (5,706)
- [The largest companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/largest-companies-nouvelle-aquitaine) (5,459)
- [The largest companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/largest-companies-hauts-de-seine) (5,160)
- [The largest companies in the Rhône department](https://www.tamtam.ai/l/largest-companies-rhone) (4,813)
- [The largest companies in Hauts-de-France](https://www.tamtam.ai/l/largest-companies-hauts-de-france) (4,505)
- [The largest companies in Pays de la Loire](https://www.tamtam.ai/l/largest-companies-pays-de-la-loire) (4,266)
- [The largest companies in the Bouches-du-Rhône department](https://www.tamtam.ai/l/largest-companies-bouches-du-rhone) (3,317)
- [The largest companies in Brittany](https://www.tamtam.ai/l/largest-companies-brittany) (3,058)
- [The largest companies in the Nord department](https://www.tamtam.ai/l/largest-companies-nord) (2,806)
- [The largest companies in the Gironde department](https://www.tamtam.ai/l/largest-companies-gironde) (2,435)
- [The largest companies in the Haute-Garonne department](https://www.tamtam.ai/l/largest-companies-haute-garonne) (2,404)
- [The largest companies in Normandy](https://www.tamtam.ai/l/largest-companies-normandy) (2,380)
- [The largest companies in the Loire-Atlantique department](https://www.tamtam.ai/l/largest-companies-loire-atlantique) (2,044)
- [The largest companies in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/largest-companies-bourgogne-franche-comte) (1,867)
- [The largest companies in Centre-Val de Loire](https://www.tamtam.ai/l/largest-companies-centre-val-de-loire) (1,701)
- [The largest companies in the Alpes-Maritimes department](https://www.tamtam.ai/l/largest-companies-alpes-maritimes) (1,538)
- [The largest companies in Paris](https://www.tamtam.ai/l/largest-companies-paris) (22,789)
- [The largest companies in Lyon](https://www.tamtam.ai/l/largest-companies-lyon) (2,679)
- [The largest companies in Toulouse](https://www.tamtam.ai/l/largest-companies-toulouse) (1,563)

## The same list elsewhere

- [The largest companies in the world](https://www.tamtam.ai/l/largest-companies-in-the-world) (415,122)
- [The largest companies in Europe](https://www.tamtam.ai/l/largest-companies-in-europe) (213,553)

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Source: https://www.tamtam.ai/l/largest-companies-clamart