These companies in Hauts-de-Seine largely represent the IT services and software development sectors, alongside larger industrial and defense groups. The companies are a mix of established firms and more recently founded enterprises. For example, Schneider Electric, founded in 1836, focuses on energy technology, while Thales, a multinational, specializes in cybersecurity and defense. Doctolib, founded in 2013, provides healthcare technology solutions, and Vusion, established in 1992, develops AI-powered digitalization for retail.
A clear pattern among these companies is their strong orientation towards digital transformation and AI integration across various industries. Many are headquartered in Levallois-Perret, Rueil-Malmaison, and Le Plessis Robinson. OPEN and SQLI, both based in Levallois-Perret, support digital transformation and customer experience, respectively. SE Advisory Services, located in Rueil-Malmaison, focuses on sustainability and digitalization goals with AI-powered software.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Schneider Electricse.com
Global energy technology leader, providing efficiency and sustainability through electrifying, automating, and digitalizing industries, businesses, and homes with intelligent devices and digital services. |
87,938 | |||
| 2 |
Thalesthalesgroup.com
Multinational specializing in cybersecurity, defense, aerospace, digital identity, and secure communications for governments and industries. |
65,031 | |||
| 3 |
Cofacecoface.com
Manages credit risk for companies, supporting their growth by offering trade credit insurance, business information, debt collection, and factoring solutions. |
6,948 | |||
| 4 |
OPENopen.global
Supports large companies and public organizations in digital transformation, focusing on technological performance, sovereignty, digital sobriety, and scaling innovations with advanced solutions. |
4,705 | |||
| 5 |
Alcatel-Lucent Enterpriseal-enterprise.com
Provides secure networking and communication solutions with built-in security, environmental focus, and compliance for organizations worldwide. |
4,055 | |||
| 6 |
Quadientquadient.com
This company helps simplify customer connections through Intelligent Communication Automation, Parcel Locker Solutions, and Mail-Related Solutions, striving for customer experience excellence |
3,963 | |||
| 7 |
Doctolibdoctolib.com
A healthcare technology company striving to create a healthier world by providing innovative solutions for care teams and individuals, emphasizing privacy and accessibility |
3,598 | |||
| 8 |
CS GROUPcs-soprasteria.com
Designs, builds, deploys, and maintains critical systems with innovative solutions and products, ensuring operational efficiency and security for client missions. |
2,968 | |||
| 9 |
SE Advisory Servicesseadvisoryservices.com
Helps organizations achieve sustainability, energy, and digitalization goals through expertise, global implementation, and AI-powered software, turning challenges into advantages. |
2,948 | |||
| 10 | 2,854 | ||||
| 11 |
ADM VALUEadmvalue.com
A French company specializing in customer relations with 16 production sites in Morocco, Madagascar, France, Spain, Senegal, and Mauritius |
2,757 | |||
| 12 |
Acolad groupacolad.com
Global content and language solutions provider; empowers organizations to localize everywhere; combines human creativity and technology; top 10 language services leader. |
2,324 | |||
| 13 |
Linedatalinedata.com
Provides humanized technology solutions and services for asset management and credit industries, helping clients evolve and operate at high levels. |
2,228 | |||
| 14 |
Vusionvusion.com
Develops AI-powered digitalization solutions for physical commerce, transforming stores into intelligent environments, improving operations, enabling e-commerce, and activating in-store retail media. |
1,113 | |||
| 15 |
Klee Groupkleegroup.com
Design and deliver tailored digital business solutions, supporting clients throughout their digital project lifecycle with a comprehensive range of expertise. |
1,025 | |||
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 |
BCA Expertisebca.fr
Expertise and assessment of vehicle damages across France and overseas territories, serving insurance companies, truck manufacturers, rental agencies, and public entities. |
1,005 | |||
| 17 |
Micropolemicropole.com
An international consulting group specializing in corporate transformation through data, offering expertise in 'Data Driven' Strategy, Cloud Acceleration, and Digital Business solutions |
803 | |||
| 18 |
Planiswareplanisware.com
Provides AI-powered SaaS platforms for organizations to strategize, plan, and deliver projects, portfolios, programs, and products efficiently. |
791 | |||
| 19 |
Lefebvre Dallozlefebvre-dalloz.fr
A leading provider of legal and tax knowledge through publishing, training, and software services, catering to various professionals and businesses in France |
728 | |||
| 20 |
Jems Groupjems-group.com
Create, manage, and operate customer data patrimony, industrializing use cases and innovative services based on AI or pure analytics for key accounts. |
717 | |||
| 21 | 636 | ||||
| 22 |
SES-imagotagses-imagotag.com
Provides smart digital labels and an IoT platform to retailers, connecting physical stores, automating processes, improving efficiency, and serving customers. |
560 | |||
| 23 |
ChapsVisionchapsvision.com
French software company specializing in data intelligence and AI, providing industry-specific solutions for diverse sectors, supporting digital transformation globally. |
558 | |||
| 24 |
VIDALvidalfrance.com
A company specializing in health product information and prescription safety solutions, reaching medical professionals across France and internationally |
530 | |||
| 25 |
Trace Onetraceone.com
Partners with brands across industries to accelerate product development and turn regulatory complexity into a competitive advantage using an AI-powered PLM platform. |
526 | |||
| 26 |
Equans Digitalequans-digital.com
Connects operational and information technology systems to structure infrastructure data, improving energy efficiency, asset availability, and security through cybersecurity and applied artificial intelligence. |
499 | |||
| 27 |
Sidetradesidetrade.com
Provides agentic AI for finance teams, managing Order-to-Cash cycles including cash collection, application, dispute resolution, credit analysis, and risk using extensive B2B transaction data. |
405 | |||
| 28 |
Renault Digitalwelcometothejungle.com
Accelerating sustainable mobility through digital transformation, product innovation, and specialized expertise in artificial intelligence, data science, user experience design, and agile methodologies. |
397 | |||
| 29 |
TELETECH INTERNATIONALteletech-int.com
Support businesses in managing customer relationships through a blend of technology and personalized human assistance for outsourcing projects. |
382 | |||
| 30 |
XXIIxxiiai.com
Specializing in real-time video analysis and AI, the company develops software to detect and analyze various situations in infrastructure and cities to enhance human vision |
381 | |||
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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 12, 2026.
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- Cybersecurity companies in the Hauts-de-Seine department 154
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- Energy companies in the Hauts-de-Seine department 144
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