The Essonne department hosts a diverse range of manufacturing companies, from large established groups to mid-sized firms. Key players include Réseau DEF, an international network specializing in fire safety systems, and LFB, which develops medicinal products for rare diseases. Other notable companies are ASN, a designer of optical submarine cable systems, and TechnicAtome, focused on compact nuclear reactor design.
The companies listed demonstrate a strong presence in specialized industrial sectors. There is a concentration of firms in high-tech manufacturing, such as HORIBA France in measuring instruments and Sebia in medical diagnostics. The data also shows a mix of industries, including automotive components with Eurostyle Systems, and food production with Moulins Soufflet.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Réseau DEFreseau-def.com
International network of expert companies providing detection, extinguishing, smoke extraction, and exit management systems through manufacturing and research facilities across several countries. |
3,484 | |||
| 2 |
LFBgroupe-lfb.com
Develops, manufactures, and markets medicinal products for serious, often rare diseases in Hemostasis, Immunology, and Intensive Care, with a focus on plasma-derived products and biotechnologies. |
2,733 | |||
| 3 |
HORIBA Francehoriba.com
HORIBA France manufactures instruments to help individuals tackle all their challenges |
2,200 | |||
| 4 | 1,717 | ||||
| 5 |
TechnicAtometechnicatome.com
Specialized in compact nuclear reactor design, construction, and maintenance for various sectors including naval propulsion, research, medicine, and energy |
1,467 | |||
| 6 |
Eurostyle Systemseurostyle-systems.fr
Design and production of industrial solutions specializing in high-precision plastics processing and leather materials for global automotive markets across fourteen production sites. |
1,158 | |||
| 7 |
HORIBA for Materialshoriba.com
Researching, developing new materials, improving manufacturing, and implementing recycling solutions for sustainability across the material supply chain. |
1,053 | |||
| 8 | 1,018 | ||||
| 9 |
L-Acousticsl-acoustics.com
Leading manufacturer of professional sound solutions founded in 1984 near Paris, with presence in over 80 countries and specializing in modern line array technology and multichannel sound systems |
700 | |||
| 10 |
record portes automatiquesrecorddoors.com
Designs, manufactures, installs, and maintains a wide range of automatic doors and related products for commercial and institutional sectors. |
523 | |||
| 11 |
Vernet Groupvernet-group.com
Family company, world leader in thermal regulation, designing and manufacturing thermostats and thermostatic elements for automotive, heating, and plumbing industries. |
418 | |||
| 12 | 325 | ||||
| 13 | 294 | ||||
| 14 |
Moulins Souffletmoulins-soufflet.fr
Designs sustainable, high-quality flours and specialties for artisan bakers, supporting agricultural transition and offering quality food respectful of tradition and environment. |
280 | |||
| 15 |
Eurostyle Systemseurostyle-systems.fr
A branch of the GMD Group specializing in manufacturing automotive plastic components for OEMs and Tier 1 suppliers with 2500 employees and a turnover of 300 M€ in 2018 |
234 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 16 |
Exotrailexotrail.com
Develops and operates propulsion systems, mission simulation software, and orbital transfer vehicles for efficient, sustainable space mobility, enabling telecommunication, Earth observation, space exploration. |
215 | |||
| 17 |
PMC Isochempmcisochem.fr
Custom manufacturing of APIs, intermediates, and excipients with drug delivery solutions including Vitamin E TPGS and amino acid polymers for pharmaceuticals. |
215 | |||
| 18 |
PCASseqens.com
Develops and produces complex molecules using advanced technologies for global leaders in Life Sciences and Innovative Technologies. Part of a larger international group. |
213 | |||
| 19 |
UMS - United Monolithic Semiconductorsums-rf.com
Designs and manufactures GaAs and GaN based RF and millimeter-wave integrated circuits and provides advanced foundry services for critical applications. |
210 | |||
| 20 |
SOPHYSAsophysa.com
Develops neurosurgical implants, including adjustable valves for hydrocephalus and intracranial pressure monitoring systems, offering advanced solutions for neurological conditions. |
195 | |||
| 21 |
ADALTRAadaltra.fr
Specializing in communication systems for various environments such as offices, hotels, hospitals, airports, stadiums, and more, our solutions are designed by CAE GROUPE |
182 | |||
| 22 | 182 | ||||
| 23 |
Toupret S.Atoupret.com
Manufacture and distribute ready-to-use wall preparation and decoration coatings for professionals and DIY enthusiasts across multiple international markets. |
177 | |||
| 24 |
Groupe Trouilletgroupe-trouillet.com
Designs and manufactures industrial vehicle bodywork, offering tailored solutions from small trucks to semi-trailers, including comprehensive fleet management services and after-sales support. |
171 | |||
| 25 |
JAULIN S.A.jaulin.com
Specialist in event engineering with a range of services including infrastructure, decorations, technical solutions, furniture rental, site management, and temporary structures |
135 | |||
| 26 |
Composite Industrie S.A.composite-industrie.com
Specializes in manufacturing and repairing composite and hybrid metal-composite parts for aerospace, military, telecom, and transportation industries worldwide. |
128 | |||
| 27 |
Elogenelogenh2.com
Specialized technology provider designing, manufacturing, and maintaining hydrogen generators using water electrolysis with a focus on safety and meeting industry standards |
127 | |||
| 28 |
Sofradirlynred.com
Designs and manufactures high-quality infrared technologies for aerospace, defense, and commercial markets, including infrared detectors for military programs and commercial thermal imaging equipment. |
123 | |||
| 29 |
BFR SYSTEMSbfrsystems.com
Design and supply of turnkey machines and production lines for food processing, packaging, handling, and quality control across multiple sectors. |
122 | |||
| 30 |
CELLforCURE by Seqenscellandgene.seqens.com
Manufacturing advanced therapy medicinal products specializing in autologous and allogeneic cell and gene solutions through comprehensive end-to-end services from phase I to commercialization. |
112 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 Essonne department
- The largest companies in the Essonne department 1,149
- Companies with in-house R&D in the Essonne department 198
- Multinational companies in the Essonne department 156
- Hardware manufacturers in the Essonne department 114
- Distributors and wholesalers in the Essonne department 76
- IT Services and IT Consulting companies in the Essonne department 70
- Professional services firms in the Essonne department 68
- Public sector organisations in the Essonne department 66
- Aerospace and defence companies in the Essonne department 65
- IT services companies in the Essonne department 60
- Retail chains in the Essonne department 59
- Construction companies in the Essonne department 56
- Software Development companies in the Essonne department 51
- Pharmaceutical companies in the Essonne department 45
- Electronics and semiconductor companies in the Essonne department 44
- Research institutes in the Essonne department 42
- Events Services companies in the Essonne department 41
- SaaS companies in the Essonne department 41
- Consulting firms in the Essonne department 40
- Family-owned companies in the Essonne department 38
- Contract manufacturers in the Essonne department 35
- Research Services companies in the Essonne department 35
- Critical infrastructure operators in the Essonne department 32
- Education providers in the Essonne department 30
The same list elsewhere in France
- Manufacturers in France 6,697
- Manufacturers in Île-de-France 1,515
- Manufacturers in Auvergne-Rhône-Alpes 1,216
- Manufacturers in Grand Est 573
- Manufacturers in Nouvelle-Aquitaine 498
- Manufacturers in Pays de la Loire 484
- Manufacturers in Occitanie 433
- Manufacturers in Provence-Alpes-Côte d'Azur 394
- Manufacturers in Hauts-de-France 369
- Manufacturers in the Rhône department 322
- Manufacturers in Brittany 307
- Manufacturers in the Hauts-de-Seine department 285
- Manufacturers in Bourgogne-Franche-Comté 272
- Manufacturers in Normandy 245
- Manufacturers in Centre-Val de Loire 207
- Manufacturers in the Nord department 204
- Manufacturers in the Bouches-du-Rhône department 187
- Manufacturers in the Isère department 178
- Manufacturers in the Haute-Garonne department 159
- Manufacturers in the Gironde department 137
- Manufacturers in the Loire-Atlantique department 125
- Manufacturers in the Loire department 122
- Manufacturers in the Bas-Rhin department 118
- Manufacturers in Paris 546