These Essonne-based contract manufacturers primarily operate in specialized sectors such as pharmaceuticals, chemicals, and aerospace components. The companies range from large established groups like LFB, which develops medicinal products for rare diseases, to mid-sized firms like PCAS, producing complex molecules for Life Sciences. Other notable companies include UMS, a designer and manufacturer of RF and millimeter-wave integrated circuits, and SIMP, specializing in plastic and rubber micro-injection molding for various industries.
The data shows a concentration of companies involved in advanced manufacturing and high-tech production. Many firms, such as Composite Industrie S.A. (aerospace parts) and PMC Isochem (custom API manufacturing), serve demanding industries. There is also a notable cluster of biotechnology and pharmaceutical manufacturing, with companies like CELLforCURE by Seqens focusing on advanced therapy medicinal products.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
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 | |||
| 2 |
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 | |||
| 3 |
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 | |||
| 4 |
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 | |||
| 5 | 182 | ||||
| 6 |
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 | |||
| 7 |
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 | |||
| 8 |
Cellforcurenovartis.fr
A facility in Europe specializing in large scale production of cell and gene therapies, offering services from development to commercialization |
104 | |||
| 9 |
Senior Aerospace Calorstatsenior-calorstat.com
Manufactures build-to-spec assemblies and bellows systems for aerospace, nuclear, semiconductor, and other high-tech industries, ensuring optimum performance in demanding environments. |
86 | |||
| 10 |
Véto-pharmaveto-pharma.com
Development, production, and distribution of innovative veterinary and bee health products, including global leadership in varroa mite treatments. |
69 | |||
| 11 |
STAE (France)stae.fr
The company specializes in supporting clients in the design, industrialization, and production of highly technical technological products in various sectors |
62 | |||
| 12 |
DELPHARM BRÉTIGNYdelpharm.com
A major player in pharmaceutical contract manufacturing, contributing to global healthcare with a focus on quality, punctuality, and employee development |
58 | |||
| 13 |
SERMserm-meca.com
Specialized in high precision metal and plastics machining, SERM offers turnkey solutions for industries like aerospace, nuclear, and medical, with quality certified by EN 9100 and ISO 9001 |
56 | |||
| 14 |
ISOCHEM SASpmcisochem.fr
A global leader in fine chemicals and active pharmaceutical ingredients, offering custom synthesis and high-tech manufacturing services to various industries |
52 | |||
| 15 |
LILI'S BROWNIES
Specializing in semi-artisanal brownies, cakes, cookies, and muffins, this company based in France serves restaurants, employing 30 team members in innovative bakery creations |
29 | |||
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 |
Varachauxvarachaux.com
Production of frozen intermediate food products including meat-based and high-quality plant-based options for industrial and collective catering clients. |
27 | |||
| 17 |
Cosima Laboratoirecosimalaboratoire.com
A dynamic and innovative company in the cosmetic sector, offering services from formulation development to manufacturing and packaging of skincare, hygiene, sun care, and hair care products |
25 | |||
| 18 |
CTM LASERctmlaser.fr
Since 1968, CTM LASER and its team offer quality and responsive services in sheet metal fabrication, forming, machining, and laser cutting |
25 | |||
| 19 |
SREBOT TECHNOLOGIESsrebot.com
Specializing in precision machining, assembly, and NDT services, the company has been a key supplier of aircraft engine components for over 40 years |
19 | |||
| 20 |
SMPF - Tôlerie fine de précisionsmpf-tolerie.fr
Specialized in high-precision sheet metalwork for aeronautical, space, military, electronic, and luxury industries Offers cutting, bending, welding, and painting services |
17 | |||
| 21 |
SUPADISsupadis.fr
Precision machining of mechanical parts from prototype to mass production for industries like aerospace, automotive, and electronics ISO 9001 and EN 9100 certified with advanced technology and quality processes |
15 | |||
| 22 |
LAB.PRODUCTIONSlab.productions
A production company specializing in event solutions, from technical design, fabrication, to assembly Expertise in stands, roadshows, structures, and décor |
15 | |||
| 23 |
CRESILAS | Impression 3Dcresilas.fr
Specializing in rapid prototyping using a variety of 3D printing techniques, with a large machine park serving industrial clients, SMEs, and individuals since 1993 |
13 | |||
| 24 |
RESA ELECTRONIQUEresa-electronique.com
Specializing in high reliability electronic equipment production, particularly for space embedded applications |
12 | |||
| 25 |
Microniquemicronique.fr
A French EMS company in Île-de-France offering electronics manufacturing and integration services, focusing on innovation with the "Revolution 2021-2023" project |
10 | |||
| 26 |
EUROPRECISeuroprecis.eu
Specializing in precision manufacturing, this company's cutting-edge production units and skilled team are dedicated to ensuring customer satisfaction |
10 | |||
| 27 |
TEXPART TECHNOLOGIEStexpart-technologies.com
Specializing in precision aluminum profiles, microtubes, metal injection molding, precision stamping & forging, and microturning for various industries since 1994 |
9 | |||
| 28 |
JCP PETITE MECANIQUE DE PRECISIONjcp-pmdp.fr
Specializing in mechanical machining since 1975, we fabricate parts, mechanical assemblies, and prototypes from various metals, alloys, and plastics |
8 | |||
| 29 |
Norline&Conorlineandco.com
Specializing in luxury packaging, Norline&Co combines the expertise of Cofima and Norline to create bespoke boxes, cases, and high-end packaging for premium brands |
6 | |||
| 30 |
3DKfactory3dkfactory.com
Online 3D printing service specializing in FDM technology, offering immediate quotes, rapid production of prototypes and small series, and mechanical design services |
6 | |||
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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
- Manufacturers in the Essonne department 127
- 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
- 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
- Contract manufacturers in France 2,250
- Contract manufacturers in Auvergne-Rhône-Alpes 523
- Contract manufacturers in Île-de-France 263
- Contract manufacturers in Pays de la Loire 217
- Contract manufacturers in Grand Est 192
- Contract manufacturers in Nouvelle-Aquitaine 180
- Contract manufacturers in Bourgogne-Franche-Comté 152
- Contract manufacturers in Occitanie 139
- Contract manufacturers in Hauts-de-France 136
- Contract manufacturers in Provence-Alpes-Côte d'Azur 111
- Contract manufacturers in Centre-Val de Loire 105
- Contract manufacturers in Normandy 101
- Contract manufacturers in Brittany 93
- Contract manufacturers in the Rhône department 87
- Contract manufacturers in the Haute-Savoie department 84
- Contract manufacturers in the Isère department 68
- Contract manufacturers in the Ain department 64
- Contract manufacturers in the Doubs department 56
- Contract manufacturers in the Nord department 56
- Contract manufacturers in the Maine-et-Loire department 55
- Contract manufacturers in the Haute-Garonne department 54
- Contract manufacturers in the Loire department 49
- Contract manufacturers in the Bouches-du-Rhône department 45
- Contract manufacturers in Paris 73