# Top 30 companies with in-house R&D in Rennes

Tamtam tracks 43 companies with in-house R&D headquartered in Rennes. This list ranks the 30 largest by number of employees on LinkedIn, led by Université de Rennes I, CHU de Rennes and DIANA. Their median headcount is 60. Half of them were founded in 2014 or later.

These Rennes-based companies are primarily large and mid-sized organizations with a strong focus on research and development. Key sectors include higher education and healthcare, IT services, and specialized manufacturing. The list features Université de Rennes I, a multidisciplinary university, and CHU de Rennes, a large public hospital. SIB (numérique, santé et secteur public) is an innovative cooperative in digital health, while Guillemot Corporation designs and manufactures interactive entertainment hardware. Cailabs develops photonic solutions, and Unseenlabs uses nanosatellites for vessel geolocation.

A notable pattern is the strong presence of companies in the IT and digital sectors, particularly those serving the public and health sectors, alongside advanced technology manufacturing. Additionally, there is a significant cluster of academic and healthcare institutions, highlighting Rennes's role as a hub for research and public services.

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

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Université de Rennes I](https://www.tamtam.ai/c/universite-de-rennes-i) (univ-rennes.fr)<br>Multidisciplinary university focusing on dynamic research, lifelong learning, societal challenges, and regional socio-economic and cultural development through partnerships. | Research Services | 🇫🇷 Rennes | 4,002 | 2022 |
| 2 | [CHU de Rennes](https://www.tamtam.ai/c/chu-de-rennes) (chu-rennes.fr)<br>Large French public hospital offering extensive medical, surgical, and obstetrical services, advanced diagnostics, research, and medical training to the population. | Hospitals and Health Care | 🇫🇷 Rennes | 3,470 |  |
| 3 | [DIANA](https://www.tamtam.ai/c/diana) (symrise.com)<br>A global supplier of fragrances, flavors, food, nutrition, and cosmetic ingredients, acquired by Symrise Group For updates, follow Symrise AG page | Food and Beverage Manufacturing | 🇫🇷 Rennes | 517 |  |
| 4 | [SIB \[numérique, santé et secteur public\]](https://www.tamtam.ai/c/sib-numerique-sante-et-secteur-public) (sib.fr)<br>Innovative cooperative in digital health and public sector, serving 620+ institutions in modernizing their IT systems with a wide range of services and expertise | IT Services and IT Consulting | 🇫🇷 Rennes | 499 | 1993 |
| 5 | [INSA Rennes](https://www.tamtam.ai/c/insa-rennes) (insa-rennes.nous-recrutons.fr)<br>Provides five-year post-baccalaureate engineering education with strong research in information technologies and materials science in Brittany, France. | Higher Education | 🇫🇷 Rennes | 483 | 1966 |
| 6 | [Guillemot Corporation](https://www.tamtam.ai/c/guillemot-corporation) (guillemot.com)<br>Design and manufacture interactive entertainment hardware and accessories under Hercules and Thrustmaster brands, distributing products worldwide with focus on growth markets. | Computer Hardware Manufacturing | 🇫🇷 Rennes | 349 | 1984 |
| 7 | [Groupe Creative](https://www.tamtam.ai/c/groupe-creative) (groupe-creative.fr)<br>Works with clients on IT and digital transformation projects, offering expertise in consulting, creation, development, research, and innovation across various digital domains. | IT Services and IT Consulting | 🇫🇷 Rennes | 232 | 2008 |
| 8 | [Cailabs](https://www.tamtam.ai/c/cailabs) (cailabs.com)<br>Designs, manufactures, and develops innovative photonic solutions for space, industry (laser machining), telecommunications, and defense sectors, specializing in laser shaping. | Telecommunications | 🇫🇷 Rennes | 192 | 2013 |
| 9 | [Sekoia](https://www.tamtam.ai/c/sekoia) (sekoia.com)<br>Building a cyber operations platform for the AI era, unifying threat intelligence, detection, response, and exposure management, making advanced defense accessible. | Computer and Network Security | 🇫🇷 Rennes | 165 | 2022 |
| 10 | [Unseenlabs](https://www.tamtam.ai/c/unseenlabs) (linktr.ee)<br>A French company using nanosatellites and RF detection technology to geolocate vessels, combat unlawful activities at sea, and provide data worldwide | Defense and Space Manufacturing | 🇫🇷 Rennes | 133 | 2015 |
| 11 | [MAÎTRE JACQUES](https://www.tamtam.ai/c/maitre-jacques) (maitre-jacques.fr)<br>Production and sale of traditional and elaborated butchery products using locally sourced French meats for retail supermarkets. | Food and Beverage Manufacturing | 🇫🇷 Rennes | 124 |  |
| 12 | [Bealink](https://www.tamtam.ai/c/bealink) (bealink.com)<br>A learning experience platform solution focused on providing innovative and effective learning solutions | Technology, Information and Internet | 🇫🇷 Rennes | 123 | 2001 |
| 13 | [Sweetch Energy](https://www.tamtam.ai/c/sweetch-energy) (sweetch.energy)<br>A renewable energy company specializing in osmotic energy, producing clean electricity from salt water to achieve a carbon neutral world | Electric Power Generation | 🇫🇷 Rennes | 66 | 2015 |
| 14 | [Astellia](https://www.tamtam.ai/c/astellia) (exfo.com)<br>Astellia offers network and subscriber intelligence solutions for mobile operators to optimize service quality, drive revenues, and reduce churn through real-time monitoring and troubleshooting | Telecommunications | 🇫🇷 Rennes | 60 | 2000 |
| 15 | [Novastep](https://www.tamtam.ai/c/novastep) (int.novastep.life)<br>A global medical device company focusing on foot and ankle conditions, developing products and educational programs for surgeons under Enovis™ #CreatingBetterTogether | Medical Equipment Manufacturing | 🇫🇷 Rennes | 60 | 2014 |
| 16 | [Mitsubishi Electric R&D Centre Europe - France](https://www.tamtam.ai/c/mitsubishi-electric-r-and-d-centre-europe-france) (mitsubishielectric-rce.eu)<br>European R&D centre specializing in communication & power electronic systems, focusing on next-gen products, innovative solutions, and open innovation collaborations | Research Services | 🇫🇷 Rennes | 60 | 1995 |
| 17 | [Steeple](https://www.tamtam.ai/c/steeple) (steeple.com)<br>Internal communication solution digitizing bulletin boards with touch screens, web, and mobile apps to involve all employees through company news and updates. | Business Consulting and Services | 🇫🇷 Rennes | 50 | 2017 |
| 18 | [BBright](https://www.tamtam.ai/c/bbright) (bbright.com)<br>A global leader in next-generation video delivery solutions, specializing in compression, transmission, and processing technologies for TV operators, content providers, and broadcasters | Media and Telecommunications | 🇫🇷 Rennes | 41 | 2013 |
| 19 | [STIRWELD](https://www.tamtam.ai/c/stirweld) (stirweld.com)<br>The company developed a technology for Friction Stir Welding on CNC machines, offering cost-effective and adaptable solutions for welding and machining | Industrial Machinery Manufacturing | 🇫🇷 Rennes | 32 | 2017 |
| 20 | [TECCONTROL](https://www.tamtam.ai/c/teccontrol) (teccontrol.fr)<br>TECCONTROL is an integrator facilitating low-energy solutions for residential and commercial buildings, offering environmentally friendly heating and water management products | Renewable Energy Semiconductor Manufacturing | 🇫🇷 Rennes | 31 | 2011 |
| 21 | [Biosency](https://www.tamtam.ai/c/biosency) (biosency.com)<br>A French medical device company developing smart healthcare solutions, starting with a PPG sensor system for monitoring and preventing respiratory insufficiency | Medical Equipment Manufacturing | 🇫🇷 Rennes | 30 | 2017 |
| 22 | [Mobility Tech Green Europe](https://www.tamtam.ai/c/mobility-tech-green-europe) (mobilitytechgreen.com)<br>Innovative company with 12 years of experience offering car-sharing solutions to businesses and local authorities, reducing costs and CO2 emissions | IT Services and IT Consulting | 🇫🇷 Rennes | 29 | 2009 |
| 23 | [Therenva](https://www.tamtam.ai/c/therenva) (therenva.com)<br>Develops advanced imaging software tools for cardiovascular procedures utilizing image processing, deep learning, and biomechanical simulation to assist in endovascular interventions | Software Development | 🇫🇷 Rennes | 27 | 2007 |
| 24 | [Hogo](https://www.tamtam.ai/c/hogo) (hogo.eu)<br>Specializing in cybersecurity, this company provides integrated solutions for securing data exchanges via removable devices and developing "White Stations" for French markets They offer decontamination and data transfer solutions, custom developments, and continuous innovation in cyber defense | Computer and Network Security | 🇫🇷 Rennes | 26 | 2016 |
| 25 | [VeoNum](https://www.tamtam.ai/c/veonum) (veonum.com)<br>Rennes-based consultancy firm with a human-centric approach, offering tailored training, benefits, and a focus on R&D in AI, machine learning, and video streaming technologies Join our team! | Software Development | 🇫🇷 Rennes | 25 | 2018 |
| 26 | [OKNOPLAST France](https://www.tamtam.ai/c/oknoplast-france) (oknoplast.fr)<br>A leading manufacturer of premium PVC and aluminum windows and doors in Europe, known for quality, innovation, and refined design With 3,500 partners across 19 countries | Wholesale Import and Export | 🇫🇷 Rennes | 24 | 2012 |
| 27 | [IMATAG](https://www.tamtam.ai/c/imatag) (imatag.com)<br>Specializing in identification solutions for images, this company believes in the power of persistent image-source links for photo professionals and brand marketers | Software Development | 🇫🇷 Rennes | 20 | 2015 |
| 28 | [SurfactGreen](https://www.tamtam.ai/c/surfactgreen) (surfactgreen.com)<br>Developing and producing biosourced surfactants from patents and R&D for various industries, reducing toxicity and environmental impact. | Chemical Manufacturing | 🇫🇷 Rennes | 18 | 2016 |
| 29 | [OSMOS X](https://www.tamtam.ai/c/osmos-x) (osmos-x.com)<br>Builds, operates reusable Orbital Transfer Vehicles for orbital transfer, in-space mobility, and space debris removal in multi-mission platform. | Defense and Space Manufacturing | 🇫🇷 Rennes | 18 | 2022 |
| 30 | [Centre Culinaire Conseil](https://www.tamtam.ai/c/centre-culinaire-conseil) (conseil.centreculinaire.com)<br>The company supports professionals in the food industry with innovation and optimization through qualitative studies, culinary workshops, prototyping, media content creation, and training services | Food and Beverage Manufacturing | 🇫🇷 Rennes | 17 | 2018 |

## 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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Source: https://www.tamtam.ai/l/r-and-d-companies-rennes