The companies based in Massy operate across diverse sectors, including retail, nuclear energy, software development, and security. Most are mid-sized to large firms, with a strong presence of established corporations. Carrefour, a major retailer, operates grocery formats globally. Orano DS provides expertise in nuclear industrial logistics and waste management. Infovista develops data-driven solutions for network optimization. Secours Islamique France offers emergency aid and development programs worldwide.
A notable pattern is the concentration of companies in sectors related to infrastructure and services, such as security, IT, and real estate management. This suggests a local economy that supports both large-scale operations and specialized technical services.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Carrefourcarrefour.fr
Operates grocery retail formats: hypermarkets, supermarkets, cash & carry, convenience stores. Major employer and local supply chain partner in over 30 countries. |
107,234 | |||
| 2 |
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 | |||
| 3 |
Orano DSorano.group
Provides expertise and solutions to nuclear operators in industrial logistics, specialized maintenance, radiological safety, decommissioning, and waste management. |
2,118 | |||
| 4 |
Carrefour Propertycarrefourproperty.fr
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. |
901 | |||
| 5 |
Infovistainfovista.com
Empowers service providers and enterprises with data-driven solutions for optimizing network performance, enhancing customer experience, and driving business success. |
834 | |||
| 6 |
Secours Islamique Francesecours-islamique.org
Provides emergency aid, development programs, and social support in water, food security, child protection, and vulnerable populations worldwide. |
658 | |||
| 7 |
Sector Alarm Francesectoralarm.fr
Provides advanced alarm solutions and 24/7 security monitoring for residential and business clients across Europe with a focus on high customer satisfaction. |
434 | |||
| 8 |
Weesureweesure.com
Surveillance, fire safety, and protection services through audits and electronic security for healthcare, military, industrial, and retail sectors to prevent various risks. |
374 | |||
| 9 | 265 | ||||
| 10 | 181 | ||||
| 11 |
iObeyaiobeya.com
Transforms physical workspaces into immersive, collaborative digital environments for sharing KPIs, plans, and ideas, fostering collective intelligence and quick decision-making. |
156 | |||
| 12 |
CA CONSUMER FINANCEca-cf.fr
A financial services company based in France, specializing in consumer finance solutions |
123 | |||
| 13 |
KYOCERA Document Solutions Francekyoceradocumentsolutions.fr
Provide comprehensive document management solutions including software, hardware, and professional services to support digital transformation and reduce environmental impact. |
113 | |||
| 14 |
GSDI - Expert en Cosmétique Urbainegsdi.fr
Provides innovative, eco-friendly urban surface treatments including adhesive films, protective coatings, and decorative solutions for various industries. |
98 | |||
| 15 |
HTDS Sûreté & Détectionhtds.fr
A multinational company specializing in high-tech security and product inspection equipment for airports, ports, law enforcement, industries, and other organizations |
97 | |||
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 |
CERC (Cardiovascular European Research Center)cerc-europe.org
A leading European CRO founded by experienced physicians, specializing in clinical research, innovative techniques, and supporting young scientific leaders globally |
84 | |||
| 17 |
Löwenstein Medical Franceloewensteinmedical.com
Development and supply of reliable respiratory assistance devices for hospitals and home care, focusing on patient quality of life and support. |
72 | |||
| 18 |
APDRA Pisciculture Paysanneapdra.org
A French NGO promoting sustainable fish farming in developing countries, enhancing food security, resource diversification, and empowering rural communities through training and awareness |
65 | |||
| 19 |
Gewiss Francegewiss.com
An international leader in low-voltage electrical systems and components for residential, commercial, and industrial sectors, offering lighting solutions and EV charging infrastructure |
58 | |||
| 20 |
SCP Europescpeurope.com
Distribution of pool, spa, sauna, and leisure products across Europe with extensive inventory and customer-focused service for business growth. |
55 | |||
| 21 |
Hamamatsu Photonics Francehamamatsu.com
Manufactures optoelectronic components, modules, and systems covering the entire optical spectrum for demanding applications in medical, automotive, science, environmental, analytical, and industrial processes. |
49 | |||
| 22 |
Cuenodcuenod.com
With over 120 years of experience, this European burner manufacturer offers a wide range of environmentally-friendly heating solutions for residential, commercial, and industrial applications |
46 | |||
| 23 |
Aryason Consultingaryason.fr
Massy based firm specialized in providing professional advice on computer systems and software solutions with seven years of industry experience. |
26 | |||
| 24 |
SpotLight Earthspotlight-earth.com
Strategic partner for CCS planning and surveillance, delivering innovative technology solutions for onshore and offshore carbon capture and storage projects worldwide. |
25 | |||
| 25 |
A.W. Faber-Castell Francefaber-castell.fr
A German family-owned company founded in 1761, manufacturing high-quality pencils, fine art products, and personalized writing instruments with global distribution |
19 | |||
| 26 |
OPTOPRIM Franceoptoprim.com
Wholesale company operating in Vanves, France, specializing in optical products and accessories |
14 | |||
| 27 |
Mead Johnson Nutrition - Francenutramigen.fr
Specializes in infant nutrition focused on combating cow's milk protein allergies to improve health and well-being of infants. |
11 | |||
| 28 |
Adentsantaresvisiongroup.com
A leading provider of serialization solutions for product identification and traceability in the pharmaceutical industry, helping companies comply with regulations |
11 | |||
| 29 |
GE DIGITAL SERVICES EUROPEge.com
A company in Europe specializing in digital services for industrial challenges, including renewable energy, emissions reduction, productivity, demand adaptation, and team safety |
8 | |||
| 30 |
HUB Parking Technology FRhubparking.fr
Innovative parking technology company: develops, installs, and supports Parking Access and Revenue Control Systems worldwide Offers scalable solutions with remote management capabilities |
5 | |||
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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 Massy
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