# The 100 largest companies in the Essonne department

Tamtam tracks 1,149 companies headquartered in the Essonne department. This list ranks the 100 largest by number of employees on LinkedIn, led by Carrefour, Intermarché and INTERSPORT FRANCE. Their median headcount is 501. Half of them were founded in 1982 or later. The most common headquarters are Massy (18), Palaiseau (15) and Les Ulis (6).

These companies in Essonne are primarily large retail groups and institutions, alongside some mid-sized manufacturing and research firms. Carrefour and Intermarché are major grocery retailers, while INTERSPORT FRANCE focuses on sports goods. École Polytechnique and CentraleSupélec are prominent educational and research institutions. LFB manufactures pharmaceuticals for rare diseases.

The data shows a strong presence of retail companies, particularly in the grocery and DIY sectors, with headquarters distributed across towns like Massy, Bondoufle, and Longjumeau. There is also a notable cluster of research and higher education institutions around Palaiseau and Gif-sur-Yvette, indicating a concentration of scientific and technological expertise in the area.

🇫🇷 Essonne · 100 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Carrefour](https://www.tamtam.ai/c/carrefour) (carrefour.fr)<br>Operates grocery retail formats: hypermarkets, supermarkets, cash & carry, convenience stores. Major employer and local supply chain partner in over 30 countries. | Retail | 🇫🇷 Massy | 107,234 |  |
| 2 | [Intermarché](https://www.tamtam.ai/c/intermarche) (carrieres-mousquetaires.com)<br>Specializing in fresh products, this company operates a network of over 2,300 stores in Europe, offering various formats to meet customer needs | Retail | 🇫🇷 Bondoufle | 49,569 | 1969 |
| 3 | [INTERSPORT FRANCE](https://www.tamtam.ai/c/intersport-france) (intersport.fr)<br>Cooperative of independent entrepreneurs making sport accessible everywhere through affordable prices, major brands, expert advice, and local support for clubs. | Retail | 🇫🇷 Longjumeau | 6,489 | 1924 |
| 4 | [Netto](https://www.tamtam.ai/c/netto) (carrieres-mousquetaires.com)<br>French hard discount chain offering affordable, quality food products, many French-made private labels, through its numerous stores nationwide. Recruitment opportunities available. | Retail Groceries | 🇫🇷 Vert-le-Grand | 4,382 |  |
| 5 | [École Polytechnique](https://www.tamtam.ai/c/ecole-polytechnique) (polytechnique.edu)<br>Leading French institution offering top-level research, academic programs, and innovation in science and technology with a strong emphasis on excellence and humanist traditions | Research Services | 🇫🇷 Palaiseau | 4,377 | 1794 |
| 6 | [Bricomarché](https://www.tamtam.ai/c/bricomarche) (bricomarche.com)<br>Leading independent DIY network, enabling customers to maintain and improve their homes through a wide range of products and services. | Retail | 🇫🇷 Bondoufle | 4,333 |  |
| 7 | [Réseau DEF](https://www.tamtam.ai/c/reseau-def) (reseau-def.com)<br>International network of expert companies providing detection, extinguishing, smoke extraction, and exit management systems through manufacturing and research facilities across several countries. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Massy | 3,484 | 1958 |
| 8 | [LFB](https://www.tamtam.ai/c/lfb) (groupe-lfb.com)<br>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 | 🇫🇷 Les Ulis | 2,733 | 1994 |
| 9 | [DEF](https://www.tamtam.ai/c/def) (def-online.com)<br>French company, fire safety system solutions and services, from design to maintenance, including international sites and nuclear sector expertise. | Security Systems Services | 🇫🇷 Massy | 2,554 | 1958 |
| 10 | [RAZEL-BEC \| FAYAT Group](https://www.tamtam.ai/c/razel-bec-fayat-group) (fayat.com)<br>Specializes in public works including civil engineering, infrastructure, underground works, industrial and nuclear projects, environmental and urban engineering with innovative solutions. | Construction | 🇫🇷 Saclay | 2,233 |  |
| 11 | [HORIBA France](https://www.tamtam.ai/c/horiba-france) (horiba.com)<br>HORIBA France manufactures instruments to help individuals tackle all their challenges | Measuring and Control Instrument Manufacturing | 🇫🇷 Palaiseau | 2,200 |  |
| 12 | [CentraleSupélec](https://www.tamtam.ai/c/centralesupelec) (centralesupelec.fr)<br>Provides higher education with 4,500 students across three campuses, 370 staff, 3 international schools, 5 associated labs, and partners with 176 universities and 140 companies. | Higher Education | 🇫🇷 Gif-sur-Yvette | 2,125 | 1829 |
| 13 | [ONERA - The French Aerospace Lab](https://www.tamtam.ai/c/onera-the-french-aerospace-lab) (onera.fr)<br>Researching future aerospace and defense challenges, contributing to industry competitiveness through expertise in all related disciplines and technologies. | Aviation and Aerospace Component Manufacturing | 🇫🇷 Palaiseau | 2,097 | 1946 |
| 14 | [ASN](https://www.tamtam.ai/c/asn) (asn.com)<br>Designs, installs, and maintains global optical submarine cable systems for telecom, content providers, and offshore oil and gas industries. | Telecommunications | 🇫🇷 Les Ulis | 1,717 | 1994 |
| 15 | [TRUFFAUT](https://www.tamtam.ai/c/truffaut) (truffaut.com)<br>A company with a two-century passion for nature, promoting well-being, health, education, and ecology through gardening, plants, home, and pet products | Retail | 🇫🇷 Lisses | 1,692 | 1824 |
| 16 | [Menard](https://www.tamtam.ai/c/menard) (menard-group.com)<br>A global leader in ground improvement works using innovative technologies to optimize geotechnical conditions for various infrastructure projects worldwide | Construction | 🇫🇷 Orsay | 1,590 |  |
| 17 | [Century 21 France](https://www.tamtam.ai/c/century-21-france) (century21.fr)<br>Real estate transactions, residential, commercial property, rental management, and co-ownership syndic services across France, with a focus on luxury properties too. | Real Estate | 🇫🇷 Lisses | 1,493 | 1987 |
| 18 | [TechnicAtome](https://www.tamtam.ai/c/technicatome) (technicatome.com)<br>Specialized in compact nuclear reactor design, construction, and maintenance for various sectors including naval propulsion, research, medicine, and energy | Defense and Space Manufacturing | 🇫🇷 Villiers-le-Bâcle | 1,467 | 1972 |
| 19 | [ITM Logistique Alimentaire Intermarché](https://www.tamtam.ai/c/itm-logistique-alimentaire-intermarche) (carrieres-mousquetaires.com)<br>Integrated logistics branch managing storage, preparation, transport, and delivery of goods to over 2,650 retail points across France through thirty-one domestic bases. | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Bondoufle | 1,364 |  |
| 20 | [UTAC](https://www.tamtam.ai/c/utac) (utac.com)<br>Advancing mobility industry towards safer, cleaner future. Provides large range of services to bring vehicles to market. | Motor Vehicle Manufacturing | 🇫🇷 Linas | 1,249 |  |
| 21 | [Terideal](https://www.tamtam.ai/c/terideal) (terideal.fr)<br>Develops, designs, builds, and maintains complex projects across France, focusing on landscape, public works, and building sectors, adapting territories to climate change. | Construction | 🇫🇷 Wissous | 1,243 | 1969 |
| 22 | [CENTRE HOSPITALIER SUD FRANCILIEN](https://www.tamtam.ai/c/centre-hospitalier-sud-francilien) (chsf.fr)<br>Public healthcare institution serving one million people in southern Île-de-France, providing medical services and hospital care to the community. | Hospitals and Health Care | 🇫🇷 Corbeil-Essonnes | 1,219 |  |
| 23 | [Eurostyle Systems](https://www.tamtam.ai/c/eurostyle-systems-les-ulis) (eurostyle-systems.fr)<br>Design and production of industrial solutions specializing in high-precision plastics processing and leather materials for global automotive markets across fourteen production sites. | Manufacturing | 🇫🇷 Les Ulis | 1,158 | 1964 |
| 24 | [FFR - Fédération Française de Rugby](https://www.tamtam.ai/c/ffr-federation-francaise-de-rugby) (ffr.fr)<br>Organizes, develops, and promotes rugby across France, supporting amateur rugby, social initiatives, and national teams, offering B2B experiences. | Spectator Sports | 🇫🇷 Marcoussis | 1,144 | 1919 |
| 25 | [AgroParisTech](https://www.tamtam.ai/c/agroparistech) (agroparistech.fr)<br>Educates professionals in life and environmental sciences, focusing on sustainable resource management, innovation, and bioeconomy through various academic programs. | Higher Education | 🇫🇷 Palaiseau | 1,093 | 2007 |
| 26 | [Département de l'Essonne](https://www.tamtam.ai/c/departement-de-l-essonne) (essonne.fr)<br>Region with major transport links, hosting research centers, universities, competitive industries, and offering a high quality natural living environment. | Government Administration | 🇫🇷 Évry-Courcouronnes | 1,072 |  |
| 27 | [HORIBA for Materials](https://www.tamtam.ai/c/horiba-for-materials) (horiba.com)<br>Researching, developing new materials, improving manufacturing, and implementing recycling solutions for sustainability across the material supply chain. | Research Services | 🇫🇷 Palaiseau | 1,053 |  |
| 28 | [La Vie Claire, S.A.](https://www.tamtam.ai/c/la-vie-claire-s-a) (lavieclaire.com)<br>Retail business based in Rhone, France, with a focus on providing various products to customers at their location in Montagny | Retail | 🇫🇷 Grigny | 1,048 | 1947 |
| 29 | [Sebia](https://www.tamtam.ai/c/sebia) (sebia.com)<br>Global specialty in vitro diagnostic leader for screening and monitoring various diseases, including oncology, diabetes, and autoimmunity. | Medical Equipment Manufacturing | 🇫🇷 Lisses | 1,018 | 1967 |
| 30 | [Promocash France](https://www.tamtam.ai/c/promocash-france) (promocash.com)<br>A network of independent franchisees in the food industry, offering online ordering, drive and delivery services, with personalized in-store assistance Passionate and professional professionals | Wholesale | 🇫🇷 Massy | 1,017 |  |
| 31 | [Télécom Paris](https://www.tamtam.ai/c/telecom-paris) (telecom-paris.fr)<br>A leading educational institution in ICT, offering various programs in engineering, masters, and PhD, with a focus on innovation and entrepreneurship in the digital world | Higher Education | 🇫🇷 Palaiseau | 953 | 1878 |
| 32 | [SIFA](https://www.tamtam.ai/c/sifa) (sifalogistics.com)<br>Provides tailored logistics solutions globally, combining human expertise and technology for end-to-end management of transport and supply chains, including real-time tracking. | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Villejust | 951 | 1951 |
| 33 | [ENSTA](https://www.tamtam.ai/c/ensta) (ensta.fr)<br>Leading public institution for higher education, research, and innovation. Offers engineering cycles, master's, doctorates, and specialized master's degrees for scientific and technical excellence. | Higher Education | 🇫🇷 Palaiseau | 916 | 1741 |
| 34 | [Paris-Sud University (Paris XI)](https://www.tamtam.ai/c/paris-sud-university-paris-xi) (universite-paris-saclay.fr)<br>A prestigious research university focused on understanding the world, student success, and meeting society's needs with top student integration into the workforce | Higher Education | 🇫🇷 Orsay | 910 | 1970 |
| 35 | [Carrefour Property](https://www.tamtam.ai/c/carrefour-property) (carrefourproperty.fr)<br>Property owner for hypermarkets and supermarkets in France, Spain, and Italy, managing over 4 million square meters across 1,000 European sites, partnering with Carmila for commercial centers. | Real Estate | 🇫🇷 Massy | 901 | 2009 |
| 36 | [ENS Paris-Saclay](https://www.tamtam.ai/c/ens-paris-saclay) (ens-paris-saclay.fr)<br>Public institution providing high-level scientific and cultural education for research, teaching, and leadership roles in various sectors. | Higher Education | 🇫🇷 Gif-sur-Yvette | 847 | 1912 |
| 37 | [NOVELTY](https://www.tamtam.ai/c/novelty) (novelty.fr)<br>Specialist in technical support for event industries, offering services like audiovisual equipment rental, engineering, sales, installation, and maintenance of audiovisual systems | Events Services | 🇫🇷 Longjumeau | 835 | 1973 |
| 38 | [Infovista](https://www.tamtam.ai/c/infovista) (infovista.com)<br>Empowers service providers and enterprises with data-driven solutions for optimizing network performance, enhancing customer experience, and driving business success. | Software Development | 🇫🇷 Massy | 834 | 1995 |
| 39 | [SDIS 91](https://www.tamtam.ai/c/sdis-91) (sdis91.fr)<br>Public fire and rescue service with professional and volunteer firefighters, focusing on protection, risk prevention, and civil security policies. | Public Safety | 🇫🇷 Évry-Courcouronnes | 829 |  |
| 40 | [SATELEC - FAYAT ENERGIE SERVICES](https://www.tamtam.ai/c/satelec-fayat-energie-services) (satelec.fayat.com)<br>Specializing in new construction, renovation, and maintenance of electrical installations and energy networks across France, with expertise in smart city infrastructure, industrial processes, and energy efficiency | Electric Power Transmission, Control, and Distribution | 🇫🇷 Viry-Châtillon | 766 |  |
| 41 | [L-Acoustics](https://www.tamtam.ai/c/l-acoustics) (l-acoustics.com)<br>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 | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Marcoussis | 700 | 1984 |
| 42 | [Secours Islamique France](https://www.tamtam.ai/c/secours-islamique-france) (secours-islamique.org)<br>Provides emergency aid, development programs, and social support in water, food security, child protection, and vulnerable populations worldwide. | Non-profit Organizations | 🇫🇷 Massy | 658 | 1991 |
| 43 | [ENERIA](https://www.tamtam.ai/c/eneria) (eneria.fr)<br>The company provides innovative and competitive energy solutions worldwide, including gensets, engines, photovoltaic panels, and energy management systems | Industrial Machinery Manufacturing | 🇫🇷 Montlhéry | 636 | 1906 |
| 44 | [Bruneau](https://www.tamtam.ai/c/bruneau) (bruneau.fr)<br>provides over 25,000 office furniture, seating, and stationery products with fast delivery, serving businesses and professionals across France | Retail Office Equipment | 🇫🇷 Villebon-sur-Yvette | 575 | 1955 |
| 45 | [MONDIAL PROTECTION - GROUPE](https://www.tamtam.ai/c/mondial-protection-groupe) (mondial-protection.fr)<br>Announcement of LinkedIn page closure with invitation to follow a new LinkedIn page for continued updates and information. | Security and Investigations | 🇫🇷 Massy | 572 | 1997 |
| 46 | [Horoquartz](https://www.tamtam.ai/c/horoquartz) (horoquartz.com)<br>Provides integrated solutions for workforce management, planning optimization, activity tracking, access control, and identity management, serving over 5000 clients globally. | Software Development | 🇫🇷 Massy | 568 | 1971 |
| 47 | [French bee](https://www.tamtam.ai/c/french-bee) (frenchbee.com)<br>A French long-haul airline offering affordable flights to various destinations with modern Airbus A350 planes and a focus on reducing carbon footprint | Airlines and Aviation | 🇫🇷 Wissous | 540 | 2016 |
| 48 | [record portes automatiques](https://www.tamtam.ai/c/record-portes-automatiques) (recorddoors.com)<br>Designs, manufactures, installs, and maintains a wide range of automatic doors and related products for commercial and institutional sectors. | Wholesale Building Materials | 🇫🇷 Champlan | 523 | 1970 |
| 49 | [ista France](https://www.tamtam.ai/c/ista-france) (ista.fr)<br>Global leader water and energy metering. Provides sustainable solutions for natural resource preservation, consumption individualization, diagnostics, and equipment maintenance in collective housing. | Smart Meter Manufacturing | 🇫🇷 Massy | 521 | 1872 |
| 50 | [ECF Group](https://www.tamtam.ai/c/ecf-group) (ecfgroup.com)<br>Global supplier of small equipment, consumables, and disposable products to hospitality professionals with efficient services and distribution networks in 19 countries | Wholesale | 🇫🇷 Grigny | 501 | 1880 |
| 51 | [KS SERVICES](https://www.tamtam.ai/c/ks-services) (ks-services.com)<br>Provides tailored logistics, general services, security, and administrative support through on-site teams committed to operational excellence and continuous process improvement results. | Transportation, Logistics, Supply Chain and Storage | 🇫🇷 Orsay | 501 | 1991 |
| 52 | [ON AIR FITNESS](https://www.tamtam.ai/c/on-air-fitness) (onair-fitness.fr)<br>Unique fitness clubs experience and franchise expansion, focusing on global growth and becoming a top fitness brand. | Wellness and Fitness Services | 🇫🇷 Corbeil-Essonnes | 485 | 2018 |
| 53 | [Institut Mines-Télécom (IMT)](https://www.tamtam.ai/c/institut-mines-telecom-imt) (imt.fr)<br>Leading public group of engineering and management graduate schools, higher education and research institution, with eight public and two affiliate schools. | Higher Education | 🇫🇷 Palaiseau | 474 | 2012 |
| 54 | [CEA-List](https://www.tamtam.ai/c/cea-list) (cea.fr)<br>A research institute specializing in digital technology, supporting companies in technological development through expertise, skills, patents, and collaborative projects | Research Services | 🇫🇷 Palaiseau | 456 | 2003 |
| 55 | [FAYAT ENERGIE SERVICES](https://www.tamtam.ai/c/fayat-energie-services) (fayat.com)<br>Electrical, electronic, and IT services for new construction, rehabilitation, and maintenance in tertiary, industrial, and territorial development sectors. | Electric Power Transmission, Control, and Distribution | 🇫🇷 Viry-Châtillon | 446 | 1994 |
| 56 | [Groupe hospitalier Nord-Essonne](https://www.tamtam.ai/c/groupe-hospitalier-nord-essonne) (gh-nord-essonne.fr)<br>Regional hospital network providing comprehensive medical services including emergency, maternity, pediatrics, surgery, psychiatry, and critical care with modern technical facilities. | Hospitals and Health Care | 🇫🇷 Orsay | 446 |  |
| 57 | [BLACKSTORE France](https://www.tamtam.ai/c/blackstore-france) (blackstore.fr)<br>Accessible urban contemporary fashion and lifestyle retailer, offering international brands and essential labels through stores and e-commerce. | Retail Apparel and Fashion | 🇫🇷 Longjumeau | 445 |  |
| 58 | [Ville de Massy](https://www.tamtam.ai/c/ville-de-massy) (ville-massy.fr)<br>City with dynamic living environment, excellent transport links, attracting residents and businesses, fostering multicultural community in Greater Paris area. | Government Administration | 🇫🇷 Massy | 443 |  |
| 59 | [Sector Alarm France](https://www.tamtam.ai/c/sector-alarm-france) (sectoralarm.fr)<br>Provides advanced alarm solutions and 24/7 security monitoring for residential and business clients across Europe with a focus on high customer satisfaction. | Security and Investigations | 🇫🇷 Massy | 434 | 2019 |
| 60 | [Sleever](https://www.tamtam.ai/c/sleever) (sleever.com)<br>Pioneering, leading shrink-sleeve technology; nurturing concept through chemistry, engineering, transformation, service. Solutions for demanding pharmaceutical, perfume, cosmetic, food, homecare brands. | Packaging and Containers Manufacturing | 🇫🇷 Morangis | 430 | 1975 |
| 61 | [Vernet Group](https://www.tamtam.ai/c/vernet-group) (vernet-group.com)<br>Family company, world leader in thermal regulation, designing and manufacturing thermostats and thermostatic elements for automotive, heating, and plumbing industries. | Mechanical Or Industrial Engineering | 🇫🇷 Ollainville | 418 | 1927 |
| 62 | [Synchrotron SOLEIL](https://www.tamtam.ai/c/synchrotron-soleil) (synchrotron-soleil.fr)<br>Third generation synchrotron providing advanced experimental facilities for material geometry and properties research, serving diverse scientific users worldwide. | Research Services | 🇫🇷 Gif-sur-Yvette | 403 | 2001 |
| 63 | [Groupe BOVIS](https://www.tamtam.ai/c/groupe-bovis) (groupe-bovis.com)<br>With over forty-five years of experience, this company specializes in delicate handling, transfers, specialized transportation, and logistics for heavy, fragile, and precious items | Truck Transportation | 🇫🇷 Fleury-Mérogis | 388 | 1977 |
| 64 | [UCEM](https://www.tamtam.ai/c/ucem) (ucem.fr)<br>A leading French cooperative group in furniture retail sector, providing services in purchasing, commerce, marketing, and merchandising to affiliated stores | Furniture and Home Furnishings Manufacturing | 🇫🇷 Villebon-sur-Yvette | 378 | 1959 |
| 65 | [Weesure](https://www.tamtam.ai/c/weesure) (weesure.com)<br>Surveillance, fire safety, and protection services through audits and electronic security for healthcare, military, industrial, and retail sectors to prevent various risks. | Security and Investigations | 🇫🇷 Massy | 374 |  |
| 66 | [Institut Polytechnique de Paris](https://www.tamtam.ai/c/institut-polytechnique-de-paris) (ip-paris.fr)<br>Public higher education institution combining six top French engineering schools to deliver excellent training programs and cutting-edge research. | Higher Education | 🇫🇷 Palaiseau | 370 | 2019 |
| 67 | [Ville de Corbeil-Essonnes](https://www.tamtam.ai/c/ville-de-corbeil-essonnes) (corbeil-essonnes.fr)<br>A municipality with 53,000 residents, focused on history, heritage, and future development | Government Administration | 🇫🇷 Corbeil-Essonnes | 364 | 1951 |
| 68 | [Laboratoire de Physique des Plasmas](https://www.tamtam.ai/c/laboratoire-de-physique-des-plasmas) (polytechnique.fr)<br>Researching space, cold, and magnetic fusion plasmas, supporting major projects like ITER, and developing plasma technologies for various applications. | Research Services | 🇫🇷 Palaiseau | 339 | 2009 |
| 69 | [Brico Cash](https://www.tamtam.ai/c/brico-cash) (mousquetaires.com)<br>A hardware retail chain in France offering construction and renovation supplies with competitive prices, large stock, and a focus on employee growth and development | Retail | 🇫🇷 Bondoufle | 337 |  |
| 70 | [CHOMETTE](https://www.tamtam.ai/c/chomette) (chomette.com)<br>Supplier of professional-grade equipment and consumables for hospitality, catering, and collective sectors with extensive product range and fast delivery. | Wholesale | 🇫🇷 Grigny | 330 | 1880 |
| 71 | [Casio](https://www.tamtam.ai/c/casio) (casio.com)<br>Design and manufacture of consumer electronic products including watches, calculators, musical instruments, and other electronic devices for everyday use. | Appliances, Electrical, and Electronics Manufacturing | 🇫🇷 Palaiseau | 325 | 2002 |
| 72 | [APIXIT](https://www.tamtam.ai/c/apixit) (apixit.fr)<br>Provides cybersecurity, infrastructure, and cloud solutions, supporting clients through audits, consulting, integration, maintenance, and managed services for digital transformation. | IT Services and IT Consulting | 🇫🇷 Les Ulis | 303 | 1992 |
| 73 | [QUIETALIS](https://www.tamtam.ai/c/quietalis) (quietalis.com)<br>Designs, installs, maintains professional kitchens and laundries, ensuring optimal performance for restaurateurs and collective structures across France. | Business Consulting and Services | 🇫🇷 Bièvres | 302 | 2007 |
| 74 | [Pasqal](https://www.tamtam.ai/c/pasqal) (pasqal.com)<br>The company specializes in building programmable quantum simulators and computers using neutral atoms in optical tweezers for quantum information processing | IT Services and IT Consulting | 🇫🇷 Palaiseau | 297 | 2019 |
| 75 | [Bouygues Construction Matériel](https://www.tamtam.ai/c/bouygues-construction-materiel) (bouygues-construction.com)<br>Specializes in construction equipment and distribution through its brand Distrimo, providing expertise and industry updates. | Construction | 🇫🇷 Chilly-Mazarin | 296 |  |
| 76 | [Han](https://www.tamtam.ai/c/han) (han.fr)<br>Specializing in sourcing, creating, and marketing gift and souvenir products, as well as custom-designed promotional items with in-house branding and logistics services | Wholesale | 🇫🇷 Le Plessis-Pâté | 294 | 1982 |
| 77 | [ETP](https://www.tamtam.ai/c/etp) (etpelec.com)<br>A company based in Montgeron, France, offering electrical, air conditioning, heating, and electric vehicle charging services for over 40 years | Construction | 🇫🇷 Montgeron | 288 |  |
| 78 | [STB](https://www.tamtam.ai/c/stb) (stb-idf.com)<br>Specializing in construction and rehabilitation, the company focuses on public facilities, residential developments, and program renovations with a dynamic entrepreneurial spirit | Construction | 🇫🇷 Ris-Orangis | 284 | 2004 |
| 79 | [Moulins Soufflet](https://www.tamtam.ai/c/moulins-soufflet) (moulins-soufflet.fr)<br>Designs sustainable, high-quality flours and specialties for artisan bakers, supporting agricultural transition and offering quality food respectful of tradition and environment. | Food and Beverage Manufacturing | 🇫🇷 Corbeil-Essonnes | 280 | 1978 |
| 80 | [Centre Hospitalier de Bligny](https://www.tamtam.ai/c/centre-hospitalier-de-bligny) (chbligny.fr)<br>Non-profit hospital specializing in cardiovascular, respiratory, oncology, hematology, infectious diseases with acute and rehabilitation care services. | Hospitals and Health Care | 🇫🇷 Briis-sous-Forges | 280 | 1901 |
| 81 | [SCAL](https://www.tamtam.ai/c/scal) (scal.fr)<br>Professionals' partner in implementing pizza and Italian restaurant solutions. Supporting distribution and restaurant sector since 1984. | Wholesale | 🇫🇷 Villebon-sur-Yvette | 279 | 1984 |
| 82 | [MIEL](https://www.tamtam.ai/c/miel) (miel.fr)<br>It imports and distributes advanced hi-tech products, offering technical assistance, training, and solutions for telecom and severe environments. | IT Services and IT Consulting | 🇫🇷 Bièvres | 277 | 1985 |
| 83 | [Novoviande](https://www.tamtam.ai/c/novoviande) (novoviande.fr)<br>With 46 years of experience, Novoviande is the leading retail butcher in Île-de-France, dedicated to providing exceptional service to its customers | Retail | 🇫🇷 Brunoy | 270 | 1974 |
| 84 | [Ewigo France](https://www.tamtam.ai/c/ewigo-france) (ewigo-franchise.com)<br>Intermediary for used car transactions offering mechanical warranties, financing options, and assistance with vehicle registration paperwork for buyers and sellers. | Retail Motor Vehicles | 🇫🇷 Verrières-le-Buisson | 266 | 2014 |
| 85 | [HTDS](https://www.tamtam.ai/c/htds) (htds.fr)<br>Specialized distribution and maintenance of advanced detection systems for various applications in France and international markets. | Wholesale Import and Export | 🇫🇷 Massy | 265 | 2002 |
| 86 | [Communauté Paris-Saclay](https://www.tamtam.ai/c/communaute-paris-saclay) (paris-saclay.com)<br>Intercommunal structure uniting 27 communes in Essonne, supporting nearly 300,000 residents in the Paris-Saclay area. | Government Administration | 🇫🇷 Orsay | 254 | 2016 |
| 87 | [G4](https://www.tamtam.ai/c/g4) (g4.fr)<br>G4 specializes in streamlining information management within companies, optimizing tools for strategic alignment and providing practical support and expertise | Information Services | 🇫🇷 Arpajon | 254 | 2006 |
| 88 | [Hôpital privé Jacques Cartier](https://www.tamtam.ai/c/hopital-prive-jacques-cartier) (hopital-prive-jacques-cartier-massy.ramsaysante.fr)<br>Leading private hospital in Southern Paris, offers general and specialized surgery, emergency services, advanced medical imaging, and renowned adult and pediatric cardiology. | Hospitals and Health Care | 🇫🇷 Massy | 252 | 1996 |
| 89 | [les maçons parisiens](https://www.tamtam.ai/c/les-macons-parisiens) (lesmaconsparisiens.fr)<br>Specialist cooperative in reinforced concrete construction for collective housing, public facilities, offices, and various building projects since 1930. | Construction | 🇫🇷 Massy | 248 | 1930 |
| 90 | [NBTECH](https://www.tamtam.ai/c/nbtech) (nbtech.fr)<br>Technical studies, technology consulting, and industrial engineering services for automotive, aerospace, railway, and industrial maintenance sectors across France. | Engineering Services | 🇫🇷 Les Ulis | 244 | 2014 |
| 91 | [MyUnisoft](https://www.tamtam.ai/c/myunisoft) (myu.fr)<br>Develops a collaborative cloud platform for accounting firms, simplifying daily tasks, automating workflows, and enhancing client relationships with integrated financial management and e-invoicing compliance. | Accounting | 🇫🇷 Massy | 242 | 2018 |
| 92 | [INAPA France](https://www.tamtam.ai/c/inapa-france) (inapa.fr)<br>Distribution of paper, packaging, and communication materials with fast delivery, customer support, and commitment to sustainability in France. | Wholesale Paper Products | 🇫🇷 Villabé | 237 |  |
| 93 | [ENSAE Paris](https://www.tamtam.ai/c/ensae-paris) (ensae.fr)<br>A leading French institution in data science, statistics, economics, finance, and actuarial science with strong links to research and industry professionals | Higher Education | 🇫🇷 Palaiseau | 237 | 1945 |
| 94 | [Eurostyle Systems](https://www.tamtam.ai/c/eurostyle-systems) (eurostyle-systems.fr)<br>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 | Motor Vehicle Manufacturing | 🇫🇷 Les Ulis | 234 | 1964 |
| 95 | [Urbaine de Travaux - groupe FAYAT](https://www.tamtam.ai/c/urbaine-de-travaux-groupe-fayat) (urbaine.fayat.com)<br>Specializes in public works, civil engineering, building construction, rehabilitation, underground networks, and infrastructure projects across Paris and Ile-de-France. | Construction | 🇫🇷 Viry-Châtillon | 233 | 1967 |
| 96 | [CAPAGO International](https://www.tamtam.ai/c/capago-international) (capago.co)<br>A company specialized in processing Schengen visa applications for the French and Italian Ministries of Foreign Affairs in various countries | Outsourcing and Offshoring Consulting | 🇫🇷 Gif-sur-Yvette | 228 | 2009 |
| 97 | [C2N - Centre de Nanosciences et de Nanotechnologies](https://www.tamtam.ai/c/c2n-centre-de-nanosciences-et-de-nanotechnologies) (c2n.universite-paris-saclay.fr)<br>Research in material science, nanophotonics, nanoelectronics, nanobiotechnologies, microsystems, fundamental and applied nanotechnology science. | Research Services | 🇫🇷 Palaiseau | 225 | 2016 |
| 98 | [DSI GROUP](https://www.tamtam.ai/c/dsi-group) (group-dsi.com)<br>An engineering services company within the DSI GROUP, prioritizing staff development and customer relationships with a focus on flexibility and customer loyalty | IT Services and IT Consulting | 🇫🇷 Massy | 225 | 2007 |
| 99 | [Cœur d'Essonne Agglomération](https://www.tamtam.ai/c/coeur-d-essonne-agglomeration) (coeuressonne.fr)<br>Local government collaboration of 21 communes providing quality public services, supporting 203,000 residents and fostering regional development projects. | Government Administration | 🇫🇷 Sainte-Geneviève-des-Bois | 221 | 2016 |
| 100 | [Ville de Grigny (91)](https://www.tamtam.ai/c/ville-de-grigny-91) (grigny91.fr)<br>A dynamic city in Essonne with ambitious urban, educational, ecological, and cultural projects led by Mayor Philippe Rio, focusing on sustainable development and community well-being | Government Administration | 🇫🇷 Grigny | 219 | 2021 |

## 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

- [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)
- [Contract manufacturers in the Essonne department](https://www.tamtam.ai/l/contract-manufacturers-essonne) (35)
- [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

- [The largest companies in France](https://www.tamtam.ai/l/largest-companies-france) (90,813)
- [The largest companies in Île-de-France](https://www.tamtam.ai/l/largest-companies-ile-de-france) (36,143)
- [The largest companies in Auvergne-Rhône-Alpes](https://www.tamtam.ai/l/largest-companies-auvergne-rhone-alpes) (11,033)
- [The largest companies in Provence-Alpes-Côte d'Azur](https://www.tamtam.ai/l/largest-companies-provence-alpes-cote-dazur) (6,699)
- [The largest companies in Occitanie](https://www.tamtam.ai/l/largest-companies-occitanie) (5,769)
- [The largest companies in Grand Est](https://www.tamtam.ai/l/largest-companies-grand-est) (5,700)
- [The largest companies in Nouvelle-Aquitaine](https://www.tamtam.ai/l/largest-companies-nouvelle-aquitaine) (5,460)
- [The largest companies in the Hauts-de-Seine department](https://www.tamtam.ai/l/largest-companies-hauts-de-seine) (5,160)
- [The largest companies in the Rhône department](https://www.tamtam.ai/l/largest-companies-rhone) (4,813)
- [The largest companies in Hauts-de-France](https://www.tamtam.ai/l/largest-companies-hauts-de-france) (4,505)
- [The largest companies in Pays de la Loire](https://www.tamtam.ai/l/largest-companies-pays-de-la-loire) (4,269)
- [The largest companies in the Bouches-du-Rhône department](https://www.tamtam.ai/l/largest-companies-bouches-du-rhone) (3,318)
- [The largest companies in Brittany](https://www.tamtam.ai/l/largest-companies-brittany) (3,058)
- [The largest companies in the Nord department](https://www.tamtam.ai/l/largest-companies-nord) (2,806)
- [The largest companies in the Gironde department](https://www.tamtam.ai/l/largest-companies-gironde) (2,435)
- [The largest companies in the Haute-Garonne department](https://www.tamtam.ai/l/largest-companies-haute-garonne) (2,406)
- [The largest companies in Normandy](https://www.tamtam.ai/l/largest-companies-normandy) (2,380)
- [The largest companies in the Loire-Atlantique department](https://www.tamtam.ai/l/largest-companies-loire-atlantique) (2,046)
- [The largest companies in Bourgogne-Franche-Comté](https://www.tamtam.ai/l/largest-companies-bourgogne-franche-comte) (1,867)
- [The largest companies in Centre-Val de Loire](https://www.tamtam.ai/l/largest-companies-centre-val-de-loire) (1,701)
- [The largest companies in the Alpes-Maritimes department](https://www.tamtam.ai/l/largest-companies-alpes-maritimes) (1,538)
- [The largest companies in Paris](https://www.tamtam.ai/l/largest-companies-paris) (22,790)
- [The largest companies in Lyon](https://www.tamtam.ai/l/largest-companies-lyon) (2,679)
- [The largest companies in Toulouse](https://www.tamtam.ai/l/largest-companies-toulouse) (1,565)

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Source: https://www.tamtam.ai/l/largest-companies-essonne