# The 30 largest contract manufacturers in the Essonne department
Tamtam tracks 35 contract manufacturers headquartered in the Essonne department. This list ranks the 30 largest by number of employees on LinkedIn, led by LFB, PMC Isochem and PCAS. Their median headcount is 29. Half of them were founded in 1983 or later. The most common headquarters are Les Ulis (4), Bondoufle (3) and Palaiseau (2).
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.
馃嚝馃嚪 Essonne 路 30 companies 路 Updated Nov 11, 2026
| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [LFB](https://www.tamtam.ai/c/lfb) (groupe-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. | Pharmaceutical Manufacturing | 馃嚝馃嚪 Les Ulis | 2,733 | 1994 |
| 2 | [PMC Isochem](https://www.tamtam.ai/c/pmc-isochem) (pmcisochem.fr)
Custom manufacturing of APIs, intermediates, and excipients with drug delivery solutions including Vitamin E TPGS and amino acid polymers for pharmaceuticals. | Chemical Manufacturing | 馃嚝馃嚪 Vert-le-Petit | 215 | 2017 |
| 3 | [PCAS](https://www.tamtam.ai/c/pcas) (seqens.com)
Develops and produces complex molecules using advanced technologies for global leaders in Life Sciences and Innovative Technologies. Part of a larger international group. | Chemical Manufacturing | 馃嚝馃嚪 Longjumeau | 213 | 1962 |
| 4 | [UMS - United Monolithic Semiconductors](https://www.tamtam.ai/c/ums-united-monolithic-semiconductors) (ums-rf.com)
Designs and manufactures GaAs and GaN based RF and millimeter-wave integrated circuits and provides advanced foundry services for critical applications. | Semiconductor Manufacturing | 馃嚝馃嚪 Villebon-sur-Yvette | 210 | 1996 |
| 5 | [SIMP](https://www.tamtam.ai/c/simp) (simp.fr)
Specializing in plastic and rubber micro-injection molding, offering innovative solutions for various industries with automated production in France A leader in cosmetic applicator creation | Personal Care Product Manufacturing | 馃嚝馃嚪 Tigery | 182 | 1949 |
| 6 | [Composite Industrie S.A.](https://www.tamtam.ai/c/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. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Bondoufle | 128 | 1983 |
| 7 | [CELLforCURE by Seqens](https://www.tamtam.ai/c/cellforcure-by-seqens) (cellandgene.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. | Biotechnology Research | 馃嚝馃嚪 Les Ulis | 112 | 2014 |
| 8 | [Cellforcure](https://www.tamtam.ai/c/cellforcure) (novartis.fr)
A facility in Europe specializing in large scale production of cell and gene therapies, offering services from development to commercialization | Biotechnology Research | 馃嚝馃嚪 Les Ulis | 104 | 2010 |
| 9 | [Senior Aerospace Calorstat](https://www.tamtam.ai/c/senior-aerospace-calorstat) (senior-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. | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Dourdan | 86 | 1928 |
| 10 | [V茅to-pharma](https://www.tamtam.ai/c/veto-pharma) (veto-pharma.com)
Development, production, and distribution of innovative veterinary and bee health products, including global leadership in varroa mite treatments. | Pharmaceutical Manufacturing | 馃嚝馃嚪 Palaiseau | 69 | 1982 |
| 11 | [STAE (France)](https://www.tamtam.ai/c/stae-france) (stae.fr)
The company specializes in supporting clients in the design, industrialization, and production of highly technical technological products in various sectors | Industrial Machinery Manufacturing | 馃嚝馃嚪 Savigny-sur-Orge | 62 | 1979 |
| 12 | [DELPHARM BR脡TIGNY](https://www.tamtam.ai/c/delpharm-bretigny) (delpharm.com)
A major player in pharmaceutical contract manufacturing, contributing to global healthcare with a focus on quality, punctuality, and employee development | Pharmaceutical Manufacturing | 馃嚝馃嚪 Br茅tigny-sur-Orge | 58 | 1994 |
| 13 | [SERM](https://www.tamtam.ai/c/serm) (serm-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 | Industrial Machinery Manufacturing | 馃嚝馃嚪 Le Coudray-Montceaux | 56 | 1962 |
| 14 | [ISOCHEM SAS](https://www.tamtam.ai/c/isochem-sas) (pmcisochem.fr)
A global leader in fine chemicals and active pharmaceutical ingredients, offering custom synthesis and high-tech manufacturing services to various industries | Chemical Manufacturing | 馃嚝馃嚪 Vert-le-Petit | 52 | 1974 |
| 15 | [LILI'S BROWNIES](https://www.tamtam.ai/c/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 | Food and Beverage Manufacturing | 馃嚝馃嚪 Les Ulis | 29 | 1991 |
| 16 | [Varachaux](https://www.tamtam.ai/c/varachaux) (varachaux.com)
Production of frozen intermediate food products including meat-based and high-quality plant-based options for industrial and collective catering clients. | Food and Beverage Manufacturing | 馃嚝馃嚪 Wissous | 27 | 1968 |
| 17 | [Cosima Laboratoire](https://www.tamtam.ai/c/cosima-laboratoire) (cosimalaboratoire.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 | Personal Care Product Manufacturing | 馃嚝馃嚪 Tigery | 25 | 2014 |
| 18 | [CTM LASER](https://www.tamtam.ai/c/ctm-laser) (ctmlaser.fr)
Since 1968, CTM LASER and its team offer quality and responsive services in sheet metal fabrication, forming, machining, and laser cutting | Mechanical Or Industrial Engineering | 馃嚝馃嚪 Igny | 25 | 1968 |
| 19 | [SREBOT TECHNOLOGIES](https://www.tamtam.ai/c/srebot-technologies) (srebot.com)
Specializing in precision machining, assembly, and NDT services, the company has been a key supplier of aircraft engine components for over 40 years | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Bondoufle | 19 | 1973 |
| 20 | [SMPF - T么lerie fine de pr茅cision](https://www.tamtam.ai/c/smpf-tolerie-fine-de-precision) (smpf-tolerie.fr)
Specialized in high-precision sheet metalwork for aeronautical, space, military, electronic, and luxury industries Offers cutting, bending, welding, and painting services | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Bondoufle | 17 | 1968 |
| 21 | [SUPADIS](https://www.tamtam.ai/c/supadis) (supadis.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 | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Le Plessis-P芒t茅 | 15 | 1970 |
| 22 | [LAB.PRODUCTIONS](https://www.tamtam.ai/c/lab-productions) (lab.productions)
A production company specializing in event solutions, from technical design, fabrication, to assembly Expertise in stands, roadshows, structures, and d茅cor | Events Services | 馃嚝馃嚪 Chilly-Mazarin | 15 | 2018 |
| 23 | [CRESILAS \| Impression 3D](https://www.tamtam.ai/c/cresilas-impression-3d) (cresilas.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 | Plastics Manufacturing | 馃嚝馃嚪 Marcoussis | 13 | 1993 |
| 24 | [RESA ELECTRONIQUE](https://www.tamtam.ai/c/resa-electronique) (resa-electronique.com)
Specializing in high reliability electronic equipment production, particularly for space embedded applications | Aviation and Aerospace Component Manufacturing | 馃嚝馃嚪 Villebon-sur-Yvette | 12 | 1994 |
| 25 | [Micronique](https://www.tamtam.ai/c/micronique) (micronique.fr)
A French EMS company in 脦le-de-France offering electronics manufacturing and integration services, focusing on innovation with the "Revolution 2021-2023" project | Appliances, Electrical, and Electronics Manufacturing | 馃嚝馃嚪 Corbeil-Essonnes | 10 | 1975 |
| 26 | [EUROPRECIS](https://www.tamtam.ai/c/europrecis) (europrecis.eu)
Specializing in precision manufacturing, this company's cutting-edge production units and skilled team are dedicated to ensuring customer satisfaction | Industrial Machinery Manufacturing | 馃嚝馃嚪 Wissous | 10 | 1988 |
| 27 | [TEXPART TECHNOLOGIES](https://www.tamtam.ai/c/texpart-technologies) (texpart-technologies.com)
Specializing in precision aluminum profiles, microtubes, metal injection molding, precision stamping & forging, and microturning for various industries since 1994 | Mechanical Or Industrial Engineering | 馃嚝馃嚪 Lisses | 9 | 1994 |
| 28 | [JCP PETITE MECANIQUE DE PRECISION](https://www.tamtam.ai/c/jcp-petite-mecanique-de-precision) (jcp-pmdp.fr)
Specializing in mechanical machining since 1975, we fabricate parts, mechanical assemblies, and prototypes from various metals, alloys, and plastics | Industrial Machinery Manufacturing | 馃嚝馃嚪 Grigny | 8 | 1975 |
| 29 | [Norline&Co](https://www.tamtam.ai/c/norline-and-co) (norlineandco.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 | Packaging and Containers Manufacturing | 馃嚝馃嚪 Grigny | 6 | |
| 30 | [3DKfactory](https://www.tamtam.ai/c/3dkfactory) (3dkfactory.com)
Online 3D printing service specializing in FDM technology, offering immediate quotes, rapid production of prototypes and small series, and mechanical design services | Manufacturing | 馃嚝馃嚪 Palaiseau | 6 | 2016 |
## 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](https://www.tamtam.ai/l/largest-companies-essonne) (1,149)
- [Companies with in-house R&D in the Essonne department](https://www.tamtam.ai/l/r-and-d-companies-essonne) (198)
- [Multinational companies in the Essonne department](https://www.tamtam.ai/l/multinational-companies-essonne) (156)
- [Manufacturers in the Essonne department](https://www.tamtam.ai/l/manufacturers-essonne) (127)
- [Hardware manufacturers in the Essonne department](https://www.tamtam.ai/l/hardware-companies-essonne) (114)
- [Distributors and wholesalers in the Essonne department](https://www.tamtam.ai/l/distributors-and-wholesalers-essonne) (76)
- [IT Services and IT Consulting companies in the Essonne department](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-essonne) (70)
- [Professional services firms in the Essonne department](https://www.tamtam.ai/l/professional-services-firms-essonne) (68)
- [Public sector organisations in the Essonne department](https://www.tamtam.ai/l/public-sector-organisations-essonne) (66)
- [Aerospace and defence companies in the Essonne department](https://www.tamtam.ai/l/aerospace-and-defense-companies-essonne) (65)
- [IT services companies in the Essonne department](https://www.tamtam.ai/l/it-services-companies-essonne) (60)
- [Retail chains in the Essonne department](https://www.tamtam.ai/l/retail-chains-essonne) (59)
- [Construction companies in the Essonne department](https://www.tamtam.ai/l/construction-companies-essonne) (56)
- [Software Development companies in the Essonne department](https://www.tamtam.ai/l/software-development-companies-essonne) (51)
- [Pharmaceutical companies in the Essonne department](https://www.tamtam.ai/l/pharmaceutical-companies-essonne) (45)
- [Electronics and semiconductor companies in the Essonne department](https://www.tamtam.ai/l/electronics-companies-essonne) (44)
- [Research institutes in the Essonne department](https://www.tamtam.ai/l/research-institutes-essonne) (42)
- [Events Services companies in the Essonne department](https://www.tamtam.ai/l/events-services-companies-essonne) (41)
- [SaaS companies in the Essonne department](https://www.tamtam.ai/l/saas-companies-essonne) (41)
- [Consulting firms in the Essonne department](https://www.tamtam.ai/l/consulting-firms-essonne) (40)
- [Family-owned companies in the Essonne department](https://www.tamtam.ai/l/family-owned-companies-essonne) (38)
- [Research Services companies in the Essonne department](https://www.tamtam.ai/l/research-services-companies-essonne) (35)
- [Critical infrastructure operators in the Essonne department](https://www.tamtam.ai/l/critical-infrastructure-operators-essonne) (32)
- [Education providers in the Essonne department](https://www.tamtam.ai/l/education-companies-essonne) (30)
## The same list elsewhere in France
- [Contract manufacturers in France](https://www.tamtam.ai/l/contract-manufacturers-france) (2,250)
- [Contract manufacturers in Auvergne-Rh么ne-Alpes](https://www.tamtam.ai/l/contract-manufacturers-auvergne-rhone-alpes) (523)
- [Contract manufacturers in 脦le-de-France](https://www.tamtam.ai/l/contract-manufacturers-ile-de-france) (263)
- [Contract manufacturers in Pays de la Loire](https://www.tamtam.ai/l/contract-manufacturers-pays-de-la-loire) (217)
- [Contract manufacturers in Grand Est](https://www.tamtam.ai/l/contract-manufacturers-grand-est) (192)
- [Contract manufacturers in Nouvelle-Aquitaine](https://www.tamtam.ai/l/contract-manufacturers-nouvelle-aquitaine) (180)
- [Contract manufacturers in Bourgogne-Franche-Comt茅](https://www.tamtam.ai/l/contract-manufacturers-bourgogne-franche-comte) (152)
- [Contract manufacturers in Occitanie](https://www.tamtam.ai/l/contract-manufacturers-occitanie) (139)
- [Contract manufacturers in Hauts-de-France](https://www.tamtam.ai/l/contract-manufacturers-hauts-de-france) (136)
- [Contract manufacturers in Provence-Alpes-C么te d'Azur](https://www.tamtam.ai/l/contract-manufacturers-provence-alpes-cote-dazur) (111)
- [Contract manufacturers in Centre-Val de Loire](https://www.tamtam.ai/l/contract-manufacturers-centre-val-de-loire) (105)
- [Contract manufacturers in Normandy](https://www.tamtam.ai/l/contract-manufacturers-normandy) (101)
- [Contract manufacturers in Brittany](https://www.tamtam.ai/l/contract-manufacturers-brittany) (93)
- [Contract manufacturers in the Rh么ne department](https://www.tamtam.ai/l/contract-manufacturers-rhone) (87)
- [Contract manufacturers in the Haute-Savoie department](https://www.tamtam.ai/l/contract-manufacturers-haute-savoie) (84)
- [Contract manufacturers in the Is猫re department](https://www.tamtam.ai/l/contract-manufacturers-isere) (68)
- [Contract manufacturers in the Ain department](https://www.tamtam.ai/l/contract-manufacturers-ain) (64)
- [Contract manufacturers in the Doubs department](https://www.tamtam.ai/l/contract-manufacturers-doubs) (56)
- [Contract manufacturers in the Nord department](https://www.tamtam.ai/l/contract-manufacturers-nord) (56)
- [Contract manufacturers in the Maine-et-Loire department](https://www.tamtam.ai/l/contract-manufacturers-maine-et-loire) (55)
- [Contract manufacturers in the Haute-Garonne department](https://www.tamtam.ai/l/contract-manufacturers-haute-garonne) (54)
- [Contract manufacturers in the Loire department](https://www.tamtam.ai/l/contract-manufacturers-loire) (49)
- [Contract manufacturers in the Bouches-du-Rh么ne department](https://www.tamtam.ai/l/contract-manufacturers-bouches-du-rhone) (45)
- [Contract manufacturers in Paris](https://www.tamtam.ai/l/contract-manufacturers-paris) (73)
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Source: https://www.tamtam.ai/l/contract-manufacturers-essonne