# Top 30 companies with in-house R&D in the Loiret department

Tamtam tracks 53 companies with in-house R&D headquartered in the Loiret department. This list ranks the 30 largest by number of employees on LinkedIn, led by Université d'Orléans, BRGM and CHU Orléans. Their median headcount is 113. Half of them were founded in 1981 or later. The most common headquarters are Orléans (9).

The companies in the Loiret department with in-house R&D are primarily large organizations, including public institutions and established manufacturing firms. Notable examples include the Université d'Orléans, a public university conducting research, BRGM, specializing in Earth Science applications, and CHU Orléans, a large university hospital. Other significant players are ALL Circuits, an EMS provider for electronics manufacturing, and Groupe LSDH, which processes and packages liquid foods.

Many of these companies, such as CILAS in defense and space manufacturing, and GUINAULT in aviation, are concentrated in Orléans. However, the presence of firms like ALL Circuits in Meung-sur-Loire and Groupe LSDH in Saint-Denis-de-l'Hôtel indicates a broader distribution of R&D activities across the department, encompassing diverse sectors from higher education and healthcare to specialized manufacturing and environmental services.

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

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Université d'Orléans](https://www.tamtam.ai/c/universite-d-orleans) (univ-orleans.fr)<br>Public university offering diverse academic programs and conducting research within the Orléans and Tours educational region in France. | Higher Education | 🇫🇷 Orléans | 1,600 | 1306 |
| 2 | [BRGM](https://www.tamtam.ai/c/brgm) (brgm.fr)<br>A French public institution specializing in Earth Science applications for managing resources, risks, and societal challenges related to climate, energy, and circular economy | Environmental Services | 🇫🇷 Orléans | 1,448 | 1959 |
| 3 | [CHU Orléans](https://www.tamtam.ai/c/chu-orleans) (chu-orleans.fr)<br>State-of-the-art university hospital located 1 hour south of Paris with 1,300 beds, modern facilities, and a staff of 5,323 professionals Located 10km from downtown Orléans | Hospitals and Health Care | 🇫🇷 Orléans | 1,368 |  |
| 4 | [ALL Circuits](https://www.tamtam.ai/c/all-circuits) (allcircuits.com)<br>Leading EMS provider specializing in automotive and industrial manufacturing, offering high-quality electronics design, industrialization, and manufacturing services globally with a strong focus on innovation and quality | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Meung-sur-Loire | 1,154 | 2009 |
| 5 | [Groupe LSDH](https://www.tamtam.ai/c/groupe-lsdh) (lsdh.fr)<br>Processes and packages various liquid foods in cartons or bottles, and fresh salads, managing the entire supply chain from sourcing to delivery. | Food and Beverage Manufacturing | 🇫🇷 Saint-Denis-de-l'Hôtel | 864 |  |
| 6 | [Antea Group - France](https://www.tamtam.ai/c/antea-group-france) (anteagroup.fr)<br>Provides environmental engineering and consulting services globally, focusing on water, industrial environments, infrastructure, and environmental data management for diverse clients. | Environmental Services | 🇫🇷 Olivet | 808 | 1994 |
| 7 | [Alstef Group](https://www.tamtam.ai/c/alstef-group) (alstefgroup.com)<br>Designs, integrates, and supports automated turnkey solutions for airports, intralogistics, and parcel markets, offering baggage handling and internal logistics flow management. | Automation Machinery Manufacturing | 🇫🇷 Boigny-sur-Bionne | 727 | 1961 |
| 8 | [LVMH RECHERCHE](https://www.tamtam.ai/c/lvmh-recherche) (lvmh.com)<br>Creates exceptional makeup, skincare, and perfume products for LVMH luxury brands, focusing on performance, sensoriality, and environmental respect through advanced research and open innovation. | Research Services | 🇫🇷 Saint-Jean-de-Braye | 398 | 1981 |
| 9 | [CILAS](https://www.tamtam.ai/c/cilas) (cilas.com)<br>Develops, manufactures, and sells laser and optronics products/systems for defense, security, space, and industry, including laser designators, surveillance equipment, and optical components. | Defense and Space Manufacturing | 🇫🇷 Orléans | 292 | 1966 |
| 10 | [CENTRE HOSPITALIER REGIONAL D'ORLEANS](https://www.tamtam.ai/c/centre-hospitalier-regional-d-orleans-49603032)<br>A medical practice company in Orleans, France, providing healthcare services at a regional hospital | Medical Practices | 🇫🇷 Orléans | 290 |  |
| 11 | [DWS](https://www.tamtam.ai/c/dws) (dws-engraving.com)<br>Specializes in engraving machines for luxury brands, enabling personalized product customization across various materials and retail environments. | Retail | 🇫🇷 Orléans | 233 | 2017 |
| 12 | [REDEX Group](https://www.tamtam.ai/c/redex-group) (redex-group.com)<br>European engineering group specializing in advanced solutions for high precision industries, focused on machine drives, strip processing technologies, and precision rolling mills, with a fully European-made product portfolio | Industrial Machinery Manufacturing | 🇫🇷 Ferrières-en-Gâtinais | 226 | 1949 |
| 13 | [GUINAULT](https://www.tamtam.ai/c/guinault) (guinault.com)<br>An international company based in France providing innovative solutions for the aviation industry, reducing environmental impact and operating costs for airlines worldwide | Aviation and Aerospace Component Manufacturing | 🇫🇷 Orléans | 185 | 1949 |
| 14 | [DELPHARM ORLEANS](https://www.tamtam.ai/c/delpharm-orleans) (delpharm.com)<br>Acquired by Delpharm in 2019, this site specializes in manufacturing liquid and solid pharmaceutical forms, including mouthwashes, syrups, tablets, and sachets | Pharmaceutical Manufacturing | 🇫🇷 Orléans | 158 |  |
| 15 | [NOVINTEC](https://www.tamtam.ai/c/novintec) (novintec.com)<br>A manufacturer of components, modules, and sub-systems for Aerospace, Process Industries, Motorsport, Space programs, and Nuclear industries, focusing on continuous improvement and R&D | Aviation and Aerospace Component Manufacturing | 🇫🇷 Sully-sur-Loire | 113 | 1972 |
| 16 | [VERGNET](https://www.tamtam.ai/c/vergnet) (vergnet.com)<br>Specializing in renewable energy solutions, they provide unique technologies for off-grid networks, controlling energy production and ensuring reliability in harsh environments worldwide | Services for Renewable Energy | 🇫🇷 Ormes | 109 | 1989 |
| 17 | [CJS](https://www.tamtam.ai/c/cjs) (cjs-plv.com)<br>Design and production of customized industrial equipment and solutions to enhance merchandising and digital marketing effectiveness across various sectors. | Advertising Services | 🇫🇷 Dordives | 73 |  |
| 18 | [Altyor](https://www.tamtam.ai/c/altyor) (altyor.fr)<br>Specializing in eco-responsible manufacturing, Altyor develops innovative electronic devices, sensors, and smart objects, offering complete product development solutions and sustainable production processes | Computers and Electronics Manufacturing | 🇫🇷 Saint-Cyr-en-Val | 72 | 1992 |
| 19 | [INTEVA FRANCE](https://www.tamtam.ai/c/inteva-france) (intevaproducts.com)<br>Designs, builds, manufactures, and assembles access control and door systems, electronic systems, and motors for the automotive industry worldwide. | Motor Vehicle Manufacturing | 🇫🇷 Sully-sur-Loire | 69 |  |
| 20 | [EDIVERT](https://www.tamtam.ai/c/edivert) (edivert.fr)<br>A company specialized in outdoor space design and maintenance, offering a wide range of landscaping services to enhance environments and infrastructure | Landscaping Services | 🇫🇷 Ormes | 65 | 1965 |
| 21 | [JOURDAIN SA](https://www.tamtam.ai/c/jourdain-sa) (jourdain-group.com)<br>An agriculture company located in France, specializing in agricultural operations and services in the Centre region | Farming | 🇫🇷 Escrennes | 58 |  |
| 22 | [Agro-Bio Antibodies](https://www.tamtam.ai/c/agro-bio-antibodies) (agrobio.stago.com)<br>Expertise in antibody production, development, and characterization supporting pharmaceutical, diagnostic industries, and public institutions with tailored immunology solutions. | Biotechnology Research | 🇫🇷 La Ferté-Saint-Aubin | 50 | 1975 |
| 23 | [ARTENAY BARS](https://www.tamtam.ai/c/artenay-bars) (delaviudacg.com)<br>Manufacture confectionery and cereal bars for private labels, focusing on innovation and product development with clients and R&D. | Food and Beverage Manufacturing | 🇫🇷 Artenay | 48 |  |
| 24 | [Umaï](https://www.tamtam.ai/c/umai) (umai-natural.fr)<br>Development of innovative, healthy, and sustainable skincare and haircare products using carefully selected French and European plants for sensitive skin. | Personal Care Product Manufacturing | 🇫🇷 Montargis | 47 | 2018 |
| 25 | [ATI INDUSTRIES](https://www.tamtam.ai/c/ati-industries) (ati-industries.eu)<br>French expert in small format incineration solutions, specializing in designing and manufacturing innovative equipment for cremation, waste treatment, and fume control | Industrial Machinery Manufacturing | 🇫🇷 Gien | 38 |  |
| 26 | [ORRION CHEMICALS ORGAFORM](https://www.tamtam.ai/c/orrion-chemicals-orgaform) (oc-orgaform.com)<br>Specializes in chemical formulation, product development, contract manufacturing, ensuring safety, quality, customer service, and environmental responsibility. | Chemical Manufacturing | 🇫🇷 Semoy | 37 | 2010 |
| 27 | [IRIS Instruments](https://www.tamtam.ai/c/iris-instruments) (iris-instruments.com)<br>Manufacture and supply of geophysical instruments including resistivimeters, IP systems, electromagnetic and magnetic resonance equipment with installation, rental, service, and training. | Environmental Services | 🇫🇷 Orléans | 29 | 1990 |
| 28 | [Nippon Shikizai France](https://www.tamtam.ai/c/nippon-shikizai-france) (shikizai.fr)<br>Formulation and manufacturing of luxury makeup, skincare, and scented products with expertise in powders, natural ingredients, and Japanese technology integration. | Personal Care Product Manufacturing | 🇫🇷 Saint-Cyr-en-Val | 27 | 1985 |
| 29 | [Safil](https://www.tamtam.ai/c/safil) (safil.fr)<br>Designs and manufactures logistics, handling, and presentation equipment to optimize productivity and user comfort while meeting ergonomic standards | Industrial Machinery Manufacturing | 🇫🇷 Bonny-sur-Loire | 26 | 1946 |
| 30 | [FARE - Réseau DEF](https://www.tamtam.ai/c/fare-reseau-def) (fare-sa.com)<br>Design and provide advanced fire safety systems including detection, extinction, sound systems, emergency exits, smoke control, and compartmentalization expertise. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Dadonville | 24 | 1989 |

## 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.

## More company lists in the Loiret department

- [The largest companies in the Loiret department](https://www.tamtam.ai/l/largest-companies-loiret) (432)
- [Manufacturers in the Loiret department](https://www.tamtam.ai/l/manufacturers-loiret) (46)
- [Retail chains in the Loiret department](https://www.tamtam.ai/l/retail-chains-loiret) (45)
- [Multinational companies in the Loiret department](https://www.tamtam.ai/l/multinational-companies-loiret) (44)
- [Public sector organisations in the Loiret department](https://www.tamtam.ai/l/public-sector-organisations-loiret) (42)
- [Hardware manufacturers in the Loiret department](https://www.tamtam.ai/l/hardware-companies-loiret) (30)
- [Critical infrastructure operators in the Loiret department](https://www.tamtam.ai/l/critical-infrastructure-operators-loiret) (27)
- [Distributors and wholesalers in the Loiret department](https://www.tamtam.ai/l/distributors-and-wholesalers-loiret) (27)
- [Contract manufacturers in the Loiret department](https://www.tamtam.ai/l/contract-manufacturers-loiret) (25)

## The same list elsewhere in France

- [Companies with in-house R&D in France](https://www.tamtam.ai/l/r-and-d-companies-france) (8,749)
- [Companies with in-house R&D in Île-de-France](https://www.tamtam.ai/l/r-and-d-companies-ile-de-france) (2,695)
- [Companies with in-house R&D in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/r-and-d-companies-auvergne-rhone-alpes) (1,460)
- [Companies with in-house R&D in Occitanie](https://www.tamtam.ai/l/r-and-d-companies-occitanie) (680)
- [Companies with in-house R&D in Grand Est](https://www.tamtam.ai/l/r-and-d-companies-grand-est) (640)
- [Companies with in-house R&D in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/r-and-d-companies-provence-alpes-cote-dazur) (612)
- [Companies with in-house R&D in Nouvelle-Aquitaine](https://www.tamtam.ai/l/r-and-d-companies-nouvelle-aquitaine) (566)
- [Companies with in-house R&D in the Hauts-de-Seine department](https://www.tamtam.ai/l/r-and-d-companies-hauts-de-seine) (510)
- [Companies with in-house R&D in the Rhône department](https://www.tamtam.ai/l/r-and-d-companies-rhone) (509)
- [Companies with in-house R&D in Pays de la Loire](https://www.tamtam.ai/l/r-and-d-companies-pays-de-la-loire) (480)
- [Companies with in-house R&D in Hauts-de-France](https://www.tamtam.ai/l/r-and-d-companies-hauts-de-france) (410)
- [Companies with in-house R&D in Brittany](https://www.tamtam.ai/l/r-and-d-companies-brittany) (366)
- [Companies with in-house R&D in the Haute-Garonne department](https://www.tamtam.ai/l/r-and-d-companies-haute-garonne) (323)
- [Companies with in-house R&D in the Bouches-du-Rhône department](https://www.tamtam.ai/l/r-and-d-companies-bouches-du-rhone) (320)
- [Companies with in-house R&D in the Isère department](https://www.tamtam.ai/l/r-and-d-companies-isere) (304)
- [Companies with in-house R&D in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/r-and-d-companies-bourgogne-franche-comte) (261)
- [Companies with in-house R&D in the Nord department](https://www.tamtam.ai/l/r-and-d-companies-nord) (237)
- [Companies with in-house R&D in Normandy](https://www.tamtam.ai/l/r-and-d-companies-normandy) (227)
- [Companies with in-house R&D in the Gironde department](https://www.tamtam.ai/l/r-and-d-companies-gironde) (225)
- [Companies with in-house R&D in the Loire-Atlantique department](https://www.tamtam.ai/l/r-and-d-companies-loire-atlantique) (207)
- [Companies with in-house R&D in the Essonne department](https://www.tamtam.ai/l/r-and-d-companies-essonne) (198)
- [Companies with in-house R&D in Centre-Val de Loire](https://www.tamtam.ai/l/r-and-d-companies-centre-val-de-loire) (195)
- [Companies with in-house R&D in Paris](https://www.tamtam.ai/l/r-and-d-companies-paris) (1,249)
- [Companies with in-house R&D in Lyon](https://www.tamtam.ai/l/r-and-d-companies-lyon) (192)

## The same list elsewhere

- [Companies with in-house R&D in the world](https://www.tamtam.ai/l/r-and-d-companies-in-the-world) (34,346)
- [Companies with in-house R&D in Europe](https://www.tamtam.ai/l/r-and-d-companies-in-europe) (20,169)

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