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

Tamtam tracks 59 companies with in-house R&D headquartered in the Vendée department. This list ranks the 30 largest by number of employees on LinkedIn, led by Groupe Atlantic, Maître CoQ and Portail SIB. Their median headcount is 172. Half of them were founded in 1973 or later. The most common headquarters are La Roche-sur-Yon (5) and Les Herbiers (4).

The Vendée department is home to a diverse group of companies engaged in in-house research and development. These firms span several key sectors, including industrial machinery, food and beverage manufacturing, construction, and shipbuilding. Most are mid-sized to large organizations, with a strong presence of long-established businesses.

Notable examples include Groupe Atlantic, a large manufacturer of heating and cooling solutions, and Maître CoQ, a major poultry brand. Construction is represented by companies like Cougnaud, specializing in modular building, and Groupe BRIAND, focused on metal, wood, and concrete structures. Sepro Group is a key player in automation machinery, while BENETEAU is a global leader in yacht building. Many of these companies, such as Portail SIB, TRONICO, and Sepro Group, were founded around the early 1970s, indicating a period of significant industrial development in the region.

🇫🇷 Vendée · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Groupe Atlantic](https://www.tamtam.ai/c/groupe-atlantic) (groupe-atlantic.fr)<br>Designing, manufacturing, and marketing heating, air conditioning, ventilation, and domestic hot water solutions. Innovating for durable, efficient, connected equipment and well-being. | Industrial Machinery Manufacturing | 🇫🇷 La Roche-sur-Yon | 4,667 |  |
| 2 | [Maître CoQ](https://www.tamtam.ai/c/maitre-coq) (maitrecoq.fr)<br>A major European poultry brand offering a wide selection of high-quality chicken, turkey, and guinea fowl products, focusing on sustainable farming practices | Food and Beverage Manufacturing | 🇫🇷 Saint-Fulgent | 843 | 1969 |
| 3 | [Portail SIB](https://www.tamtam.ai/c/portail-sib) (sib-europe.com)<br>Design, production, and distribution of custom aluminum gates, fences, shutters, garage doors, and automation solutions for professional installers. | Wholesale Building Materials | 🇫🇷 Mortagne-sur-Sèvre | 669 | 1973 |
| 4 | [Cougnaud](https://www.tamtam.ai/c/cougnaud) (cougnaud.com)<br>Industrialized modular construction and rental solutions for professional, educational, healthcare, and event spaces, both permanent and temporary, nationwide. | Construction | 🇫🇷 La Roche-sur-Yon | 654 | 1972 |
| 5 | [BENETEAU](https://www.tamtam.ai/c/beneteau) (beneteau.com)<br>A global leader in building sailing yachts and motorboats, offering innovative and elegant designs to fulfill everyone's sailing dreams worldwide | Shipbuilding | 🇫🇷 Givrand | 648 | 1884 |
| 6 | [Groupe BRIAND](https://www.tamtam.ai/c/groupe-briand) (briand.fr)<br>A French construction company specializing in metal, wood, and concrete building construction, with expertise in roofing, cladding, and structural work for various types of buildings | Construction | 🇫🇷 Les Herbiers | 611 | 1950 |
| 7 | [Sepro Group](https://www.tamtam.ai/c/sepro-group) (sepro-group.com)<br>Leading independent manufacturer of Cartesian robots for automating injection molding machines globally, equipping new or existing machines of all sizes and brands. | Automation Machinery Manufacturing | 🇫🇷 La Roche-sur-Yon | 490 | 1973 |
| 8 | [TRONICO](https://www.tamtam.ai/c/tronico) (tronico-agon.com)<br>Design, integrate electronic systems for high added-value equipment across its lifecycle. Also develops complex electronically-dominant systems as an Original Design Manufacturer. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Saint-Philbert-de-Bouaine | 395 | 1973 |
| 9 | [COGELEC](https://www.tamtam.ai/c/cogelec) (cogelec.fr)<br>Manufacturer of wireless access control systems with remote management for multi-residential and social housing markets, leading in France. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Mortagne-sur-Sèvre | 344 | 2000 |
| 10 | [Jeanneau](https://www.tamtam.ai/c/jeanneau) (jeanneau.com)<br>Builds sail and power boats since 1957. Expertise, quality, and customer input drive innovation in creating boats of extraordinary value and timeless beauty. | Shipbuilding | 🇫🇷 Les Herbiers | 263 | 1957 |
| 11 | [OCEA Construction navale](https://www.tamtam.ai/c/ocea-construction-navale) (ocea.fr)<br>Designs, builds, markets, and supports aluminum vessels up to 90m for maritime safety, yachts, territory administration, transport, and aluminum industrial elements. | Shipbuilding | 🇫🇷 Les Sables-d'Olonne | 208 | 1987 |
| 12 | [OUEST ALU (Groupe LIEBOT)](https://www.tamtam.ai/c/ouest-alu-groupe-liebot) (ouestalu.fr)<br>Specializes in innovative facade design and construction, emphasizing quality, sustainability, employee training, and strong client partnerships. | Construction | 🇫🇷 Les Herbiers | 202 | 1965 |
| 13 | [MECAPACK France](https://www.tamtam.ai/c/mecapack-france) (mecapack.fr)<br>Global leader in industrial packaging solutions, specializing in HFFS thermoforming machines, tray sealers, and complete packaging lines for diverse markets. | Machinery Manufacturing | 🇫🇷 Les Herbiers | 179 | 1947 |
| 14 | [Hydrokit](https://www.tamtam.ai/c/hydrokit) (hydrokit.com)<br>Designs, sells electro-hydraulic kits and equipment for agriculture, public works, heavy goods vehicles, forestry, industry, marine, handling, military, nuclear, and port sectors. | Machinery Manufacturing | 🇫🇷 Le Poiré-sur-Vie | 172 | 1983 |
| 15 | [ARTHUR BONNET](https://www.tamtam.ai/c/arthur-bonnet) (arthur-bonnet.com)<br>manufacturer of exclusive French kitchens combining elegant design, functionality, ergonomics, and innovation with a convivial shopping experience | Furniture and Home Furnishings Manufacturing | 🇫🇷 Saint-Philbert-de-Bouaine | 172 | 1927 |
| 16 | [PROCESS THERMOPLASTIC](https://www.tamtam.ai/c/process-thermoplastic) (process.fr)<br>Company specializes in transforming plastic and composite parts, offering comprehensive, customized services from design and prototyping to production, assembly, and logistics solutions. | Plastics Manufacturing | 🇫🇷 Challans | 164 | 1990 |
| 17 | [SADEV Racing Transmission](https://www.tamtam.ai/c/sadev-racing-transmission) (sadev-tm.com)<br>Design and manufacture of high-performance, reliable, and safe transmissions specifically for motorsport applications, supporting drivers and manufacturers worldwide. | Motor Vehicle Manufacturing | 🇫🇷 Saint-Prouant | 149 | 1974 |
| 18 | [GROUPE HUGUET](https://www.tamtam.ai/c/groupe-huguet) (groupe-huguet.fr)<br>Designs and builds custom machines, integrating industrial robots, manages electrical installations including photovoltaic and EV charging, and provides industrial maintenance services. | Industrial Machinery Manufacturing | 🇫🇷 Luçon | 130 | 1928 |
| 19 | [Atlantic France](https://www.tamtam.ai/c/atlantic-france) (atlantic-pros.fr)<br>Designs and manufactures eco-friendly multi-energy thermal comfort solutions. Offers tailored services and training for professionals in individual, collective, and public buildings. | HVAC and Refrigeration Equipment Manufacturing | 🇫🇷 La Roche-sur-Yon | 112 |  |
| 20 | [CARRE SAS](https://www.tamtam.ai/c/carre-sas) (carre.fr)<br>Design, manufacture, and distribute agricultural and industrial equipment for soil preparation, seeding, fertilization, and crop maintenance. | Industrial Machinery Manufacturing | 🇫🇷 Saint-Martin-des-Noyers | 77 | 1938 |
| 21 | [HORANET](https://www.tamtam.ai/c/horanet) (horanet.com)<br>Horanet specializes in digital solutions for managing equipment in local communities, focusing on environment, sports, access control, and user relations Operating in Vendée and La Rochelle | IT Services and IT Consulting | 🇫🇷 Fontenay-le-Comte | 75 | 1999 |
| 22 | [Simpson Strong-Tie France](https://www.tamtam.ai/c/simpson-strong-tie-france) (simpson.fr)<br>Design and manufacture a wide range of connectors and fasteners for assembling wooden frameworks and timber constructions. | Wholesale Building Materials | 🇫🇷 Sainte-Gemme-la-Plaine | 60 | 1997 |
| 23 | [RESA ✈️](https://www.tamtam.ai/c/resa-montaigu-vendee) (resa.aero)<br>Global leader in airport IT systems, offering integrated software solutions for passenger handling, baggage tracking, self-service options, flight management, and business intelligence Serving airlines and airports worldwide | Software Development | 🇫🇷 Montaigu-Vendée | 59 | 1991 |
| 24 | [JEFMAG](https://www.tamtam.ai/c/jefmag) (jefmag.fr)<br>Manufactures high-precision, machined, painted, and assembled welded structures for various industries, acting as a co-designer and tier-1 subcontractor. | Machinery Manufacturing | 🇫🇷 L'Herbergement | 59 | 1977 |
| 25 | [ARCANE](https://www.tamtam.ai/c/arcane) (arcanefrance.fr)<br>A French company founded in 1994, specializing in designing and manufacturing modular aluminum structures for workstations, enclosures, conveyors, and assembly lines | Machinery Manufacturing | 🇫🇷 Aizenay | 48 | 1994 |
| 26 | [Cocktail Vision](https://www.tamtam.ai/c/cocktail-vision) (cocktailvision.fr)<br>Design and manufacture of indoor and outdoor LED screens and panels for dynamic advertising and eco-friendly communication solutions. | Advertising Services | 🇫🇷 La Roche-sur-Yon | 46 |  |
| 27 | [STRAPHARM](https://www.tamtam.ai/c/strapharm) (naturacare.com)<br>A French specialist in developing and manufacturing natural health products, offering a wide range of food supplements and cosmetics in dry forms | Manufacturing | 🇫🇷 Montaigu-Vendée | 45 | 1988 |
| 28 | [TECAUMA](https://www.tamtam.ai/c/tecauma) (tecauma.fr)<br>Specializing in designing, manufacturing, and installing automated production lines and handling equipment for various industries, focusing on industrial woodworking, ceramics, and metallurgy | Machinery Manufacturing | 🇫🇷 Essarts en Bocage | 44 | 1977 |
| 29 | [COUGNAUD SAS (LAPEYRE)](https://www.tamtam.ai/c/cougnaud-sas-lapeyre) (recrutement-lapeyre.fr)<br>Specializing in sustainable home equipment and furnishings for consumers and professionals, offering innovative products in multiple categories with a focus on quality and eco-responsibility | Manufacturing | 🇫🇷 Aizenay | 43 | 1973 |
| 30 | [Vertal](https://www.tamtam.ai/c/vertal) (vertal.fr)<br>For 20 years, this company manufactures and sells natural agricultural solutions for animals, soils, and crops, suitable for conventional and organic farming Customers can consult technical experts for support | Farming | 🇫🇷 La Rabatelière | 42 | 2000 |

## 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 11, 2026.

## More company lists in the Vendée department

- [The largest companies in the Vendée department](https://www.tamtam.ai/l/largest-companies-vendee) (478)
- [Manufacturers in the Vendée department](https://www.tamtam.ai/l/manufacturers-vendee) (90)
- [Retail chains in the Vendée department](https://www.tamtam.ai/l/retail-chains-vendee) (72)
- [Family-owned companies in the Vendée department](https://www.tamtam.ai/l/family-owned-companies-vendee) (53)
- [Multinational companies in the Vendée department](https://www.tamtam.ai/l/multinational-companies-vendee) (46)
- [Contract manufacturers in the Vendée department](https://www.tamtam.ai/l/contract-manufacturers-vendee) (40)
- [Hardware manufacturers in the Vendée department](https://www.tamtam.ai/l/hardware-companies-vendee) (38)
- [Construction companies in the Vendée department](https://www.tamtam.ai/l/construction-companies-vendee) (30)
- [Distributors and wholesalers in the Vendée department](https://www.tamtam.ai/l/distributors-and-wholesalers-vendee) (26)
- [Food and Beverage Manufacturing companies in the Vendée department](https://www.tamtam.ai/l/food-and-beverage-manufacturing-companies-vendee) (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) (8,750)
- [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) (613)
- [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) (321)
- [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)

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