# Top 29 companies with in-house R&D in Levallois-Perret

Tamtam tracks 29 companies with in-house R&D headquartered in Levallois-Perret. This list ranks all of them by number of employees on LinkedIn, led by Plastic Omnium, Doctolib and Saft. Their median headcount is 193. Half of them were founded in 1997 or later.

These Levallois-Perret companies with in-house R&D are primarily established mid-sized to large firms, with a strong presence in manufacturing and healthcare technology. For example, Plastic Omnium provides automotive solutions, Doctolib offers healthcare technology, Saft specializes in battery solutions, and Thuasne develops medical devices. IKOS GROUP focuses on rail transportation consulting, while Linxens is a global provider of electronic components.

The companies here show a notable mix of long-established industrial players and newer technology firms. While many companies like Saft (founded 1918) and Thuasne (founded 1847) have a long history, newer companies like Doctolib (founded 2013) and Primelis (founded 2009) represent more recent developments in software and advertising services.

🇫🇷 Levallois-Perret · 29 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Plastic Omnium](https://www.tamtam.ai/c/plastic-omnium) (plasticomnium.com)<br>Provides innovative automotive solutions: exterior systems, lighting, clean energy, and complex modules. Focuses on zero-carbon mobility through hydrogen and electrification. | Motor Vehicle Manufacturing | 🇫🇷 Levallois-Perret | 9,551 |  |
| 2 | [Doctolib](https://www.tamtam.ai/c/doctolib) (doctolib.com)<br>A healthcare technology company striving to create a healthier world by providing innovative solutions for care teams and individuals, emphasizing privacy and accessibility | Software Development | 🇫🇷 Levallois-Perret | 3,598 | 2013 |
| 3 | [Saft](https://www.tamtam.ai/c/saft) (saft.com)<br>Specializing in advanced technology battery solutions, this company designs, develops, produces, and services longer-lasting batteries and systems for various industries worldwide | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Levallois-Perret | 2,986 | 1918 |
| 4 | [IKOS GROUP](https://www.tamtam.ai/c/ikos-group) (ikosconsulting.com)<br>Technology consulting firm specializing in railway engineering and energy solutions, providing technical assistance and strategic advice for clients' projects worldwide. | Rail Transportation | 🇫🇷 Levallois-Perret | 1,191 | 2005 |
| 5 | [Thuasne](https://www.tamtam.ai/c/thuasne) (thuasne.com)<br>Imagines, develops, manufactures medical devices. Offers concrete, adapted, innovative health solutions in orthopedics, medical compression, and sport. | Medical Equipment Manufacturing | 🇫🇷 Levallois-Perret | 745 | 1847 |
| 6 | [Linxens](https://www.tamtam.ai/c/linxens) (linxens.com)<br>Global electronics components provider for connectivity, tracking, and authentication across various sectors like telecom, finance, and IoT. | Manufacturing | 🇫🇷 Levallois-Perret | 719 | 1988 |
| 7 | [PCM](https://www.tamtam.ai/c/pcm) (pcmpumps.com)<br>Develops pumping solutions for transfer and dosing of abrasive, fragile, viscous, corrosive, hot, and heavy products across various industries globally. | Machinery Manufacturing | 🇫🇷 Levallois-Perret | 678 | 1932 |
| 8 | [Dalet](https://www.tamtam.ai/c/dalet) (dalet.com)<br>Empowers media organizations to transform production, distribution workflows, accelerating media operations, maximizing collaboration, and creating higher value from content with software solutions. | Software Development | 🇫🇷 Levallois-Perret | 447 | 1990 |
| 9 | [LABORATOIRE NATIVE](https://www.tamtam.ai/c/laboratoire-native) (alesgroupe.com)<br>Develops and distributes dermo-cosmetic, phyto-cosmetic, and fragrance brands globally through pharmacies and department stores, focusing on skincare, haircare, and hygiene product innovation. | Personal Care Product Manufacturing | 🇫🇷 Levallois-Perret | 446 | 2020 |
| 10 | [FONDATION SANTE SERVICE](https://www.tamtam.ai/c/fondation-sante-service) (fondation-santeservice.fr)<br>Providing multidisciplinary home hospitalization and nursing care for acute and chronic patients, supporting family-centered care and healthcare professional training. | Hospitals and Health Care | 🇫🇷 Levallois-Perret | 419 | 1958 |
| 11 | [La Roche-Posay Laboratoire Dermatologique](https://www.tamtam.ai/c/la-roche-posay-laboratoire-dermatologique) (lorealdermatologicalbeauty.com)<br>Partners with medical community to pioneer new ways to heal skin, from newborns to cancer patients, improving lives for all. | Personal Care Product Manufacturing | 🇫🇷 Levallois-Perret | 380 | 1975 |
| 12 | [SOZIO](https://www.tamtam.ai/c/sozio) (jesozio.com)<br>Creation and production of fragrance compounds for perfumery, cosmetics, home ambiance, and detergents with global manufacturing sites. | Chemical Manufacturing | 🇫🇷 Levallois-Perret | 358 | 1758 |
| 13 | [Galien](https://www.tamtam.ai/c/galien) (galien.com)<br>Offers integrated CDMO services for pharmaceuticals, including manufacturing, specialized dosage forms, formulation development, quality controls, packaging, and warehousing in a GMP environment. | Pharmaceutical Manufacturing | 🇫🇷 Levallois-Perret | 221 | 1993 |
| 14 | [RS2i](https://www.tamtam.ai/c/rs2i) (rs2i.fr)<br>Specialists in IT engineering & software solutions, enabling digital transformation through services like smart automation, data virtualization, and process optimization Trusted partner with 30+ years of experience | IT Services and IT Consulting | 🇫🇷 Levallois-Perret | 200 | 1992 |
| 15 | [Primelis](https://www.tamtam.ai/c/primelis) (primelis.com)<br>Martech agency with proprietary technology and 150 experts specializing in digital performance across Search, Social, Data, and Display channels. | Advertising Services | 🇫🇷 Levallois-Perret | 193 | 2009 |
| 16 | [Weborama](https://www.tamtam.ai/c/weborama) (weborama.com)<br>Innovative AdTech company in France and Europe specializing in semantic AI for digital advertising, offering contextual targeting tools and data-driven strategies for success | Technology, Information and Internet | 🇫🇷 Levallois-Perret | 152 | 1998 |
| 17 | [INVEHO](https://www.tamtam.ai/c/inveho) (fr.inveho.eu)<br>Designing, constructing, overhauling, and repairing industrial wagons for rail freight, ensuring safety and efficiency for various transported products. | Railroad Equipment Manufacturing | 🇫🇷 Levallois-Perret | 149 | 2018 |
| 18 | [SPACEFOOT](https://www.tamtam.ai/c/spacefoot) (spacefoot.com)<br>Operating as a 100% digital player in the sports industry, offering social networks for sports, digital advertising solutions, and e-commerce platforms for various sports equipment. | IT Services and IT Consulting | 🇫🇷 Levallois-Perret | 135 | 2008 |
| 19 | [Eloquant](https://www.tamtam.ai/c/eloquant) (eloquant.com)<br>It specializes in customer relationship solutions, offering dialogue management and feedback analysis through a SaaS platform for various clients. | Software Development | 🇫🇷 Levallois-Perret | 98 | 2001 |
| 20 | [PCM ARTIFICIAL LIFT SOLUTIONS](https://www.tamtam.ai/c/pcm-artificial-lift-solutions) (pcmals.com)<br>Design, manufacture, and service of progressive cavity pump systems for onshore and offshore oil production and gas well dewatering. | Oil and Gas | 🇫🇷 Levallois-Perret | 97 | 1932 |
| 21 | [ARKAMYS](https://www.tamtam.ai/c/arkamys) (arkamys.com)<br>A global leader in audio software for the automotive industry, specializing in sound processing technologies with offices worldwide and millions of cars equipped | Software Development | 🇫🇷 Levallois-Perret | 82 | 1998 |
| 22 | [Cerenn](https://www.tamtam.ai/c/cerenn) (cerenn.com)<br>Specialized in designing and installing modular partitions and autonomous bubbles, this company offers tailored solutions for various spaces with a focus on sustainability | Retail Office Equipment | 🇫🇷 Levallois-Perret | 80 | 1898 |
| 23 | [kalegra by kdc/one](https://www.tamtam.ai/c/kalegra-by-kdc-one) (kalegra.com)<br>Creation and growth of beauty and personal care brands through innovative R&D, manufacturing power, and strategic global partnerships fostering category leadership. | Personal Care Product Manufacturing | 🇫🇷 Levallois-Perret | 56 | 1997 |
| 24 | [GUM France](https://www.tamtam.ai/c/gum-france) (professional.sunstargum.com)<br>A global leader in oral care, health, and beauty, with a focus on research-driven products to improve worldwide health and quality of life | Pharmaceutical Manufacturing | 🇫🇷 Levallois-Perret | 56 | 2000 |
| 25 | [Laboratoires Grimberg](https://www.tamtam.ai/c/laboratoires-grimberg) (laboratoires-grimberg.com)<br>Independent pharmaceutical company specializing in gastroenterology, ENT, and mineral salts with production and distribution across France and internationally. | Pharmaceutical Manufacturing | 🇫🇷 Levallois-Perret | 55 | 1998 |
| 26 | [Bioprox Cultures](https://www.tamtam.ai/c/bioprox-cultures) (bioprox.com)<br>Food industry and biotechnology solutions subsidiary offering lactic starter cultures, enzymes, and microbiotics strains for dairy and health industries globally | Manufacturing | 🇫🇷 Levallois-Perret | 51 | 1975 |
| 27 | [Wewise France](https://www.tamtam.ai/c/wewise-france) (wewise.fr)<br>This company specializes in positive decarbonization for professionals, offering comprehensive energy transition services including photovoltaic systems, green electricity, and electric vehicle charging stations across France | Services for Renewable Energy | 🇫🇷 Levallois-Perret | 49 | 2024 |
| 28 | [SYNTHRON](https://www.tamtam.ai/c/synthron) (protex-international.com)<br>A subsidiary of an independent French industrial group, specializing in chemical specialties for niche markets like construction, electronics, coatings, textiles, and paper | Chemical Manufacturing | 🇫🇷 Levallois-Perret | 43 | 1952 |
| 29 | [Cardiawave](https://www.tamtam.ai/c/cardiawave) (cardiawave.com)<br>Clinical-stage company developing non-invasive medical device using ultrasound technology to treat aortic valve stenosis, addressing a major public health concern | Medical Equipment Manufacturing | 🇫🇷 Levallois-Perret | 33 | 2014 |

## 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 13, 2026.

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Source: https://www.tamtam.ai/l/r-and-d-companies-levallois-perret