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The 30 largest multinational companies in Massy

Tamtam tracks 30 multinational companies headquartered in Massy. This list ranks all of them by number of employees on LinkedIn, led by Carrefour, Réseau DEF and Orano DS. Their median headcount is 97. Half of them were founded in 1996 or later.

🇫🇷 Massy30 companiesUpdated Nov 11, 2026

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.

#CompanyIndustryHeadquarters EmployeesFounded
1
Carrefourcarrefour.fr

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 n/a
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.

Appliances, Electrical, and Electronics Manufacturing 🇫🇷 Massy 3,484 1958
3
Orano DSorano.group

Provides expertise and solutions to nuclear operators in industrial logistics, specialized maintenance, radiological safety, decommissioning, and waste management.

Nuclear Electric Power Generation 🇫🇷 Massy 2,118 2018
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.

Real Estate 🇫🇷 Massy 901 2009
5
Infovistainfovista.com

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
6
Secours Islamique Francesecours-islamique.org

Provides emergency aid, development programs, and social support in water, food security, child protection, and vulnerable populations worldwide.

Non-profit Organizations 🇫🇷 Massy 658 1991
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.

Security and Investigations 🇫🇷 Massy 434 2019
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.

Security and Investigations 🇫🇷 Massy 374 n/a
9
HTDShtds.fr

Specialized distribution and maintenance of advanced detection systems for various applications in France and international markets.

Wholesale Import and Export 🇫🇷 Massy 265 2002
10
CODRAcodra.net

Specializing in industrial IT, our company offers automation and test system services while also developing and distributing software solutions for various industries

Software Development 🇫🇷 Massy 181 1986
11
iObeyaiobeya.com

Transforms physical workspaces into immersive, collaborative digital environments for sharing KPIs, plans, and ideas, fostering collective intelligence and quick decision-making.

Software Development 🇫🇷 Massy 156 2011
12
CA CONSUMER FINANCEca-cf.fr

A financial services company based in France, specializing in consumer finance solutions

Financial Services 🇫🇷 Massy 123 n/a
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.

IT Services and IT Consulting 🇫🇷 Massy 113 1959
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.

Retail Office Equipment 🇫🇷 Massy 98 1993
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

Wholesale Import and Export 🇫🇷 Massy 97 2002

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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

Research Services 🇫🇷 Massy 84 2008
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.

Medical Equipment Manufacturing 🇫🇷 Massy 72 1996
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

Civic and Social Organizations 🇫🇷 Massy 65 1996
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

Appliances, Electrical, and Electronics Manufacturing 🇫🇷 Massy 58 1970
20
SCP Europescpeurope.com

Distribution of pool, spa, sauna, and leisure products across Europe with extensive inventory and customer-focused service for business growth.

Wholesale 🇫🇷 Massy 55 n/a
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.

Semiconductor Manufacturing 🇫🇷 Massy 49 1985
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

Machinery Manufacturing 🇫🇷 Massy 46 1899
23
Aryason Consultingaryason.fr

Massy based firm specialized in providing professional advice on computer systems and software solutions with seven years of industry experience.

Software Development 🇫🇷 Massy 26 2013
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.

Environmental Services 🇫🇷 Massy 25 2017
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

Consumer Goods 🇫🇷 Massy 19 1990
26
OPTOPRIM Franceoptoprim.com

Wholesale company operating in Vanves, France, specializing in optical products and accessories

Wholesale 🇫🇷 Massy 14 1994
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.

Pharmaceutical Manufacturing 🇫🇷 Massy 11 n/a
28
Adentsantaresvisiongroup.com

A leading provider of serialization solutions for product identification and traceability in the pharmaceutical industry, helping companies comply with regulations

Software Development 🇫🇷 Massy 11 2007
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

Software Development 🇫🇷 Massy 8 n/a
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

IT Services and IT Consulting 🇫🇷 Massy 5 2015

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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.

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