# Critical infrastructure operators headquartered in the Hauts-de-Seine department

Tamtam tracks 169 critical infrastructure operators headquartered in the Hauts-de-Seine department. This list ranks the 30 largest by number of employees on LinkedIn, led by VINCI Concessions, VINCI Airports and Orange. Their median headcount is 9,381. Half of them were founded in 2001 or later. The most common headquarters are Puteaux (7), Issy-les-Moulineaux (5) and Nanterre (5).

These critical infrastructure operators in Hauts-de-Seine are predominantly large groups in diverse sectors. They include VINCI Concessions, a global leader in mobility infrastructure, and Orange, a major telecommunications operator. Financial services are also well represented with Groupe Crédit Agricole, a leading European retail bank, and Worldline, which offers advanced payments technology. ENGIE is active in renewable energy power generation, while Framatome designs and services components for nuclear power plants.

A notable pattern is the concentration of headquarters in a few cities. Nanterre is home to VINCI Concessions, VINCI Airports, AXA en France, and BNP Paribas Cardif. Issy-les-Moulineaux hosts Orange and Transdev. Montrouge has Groupe Crédit Agricole and Crédit Agricole CIB, and La Garenne-Colombes houses ENGIE and ENGIE Solutions France. This indicates a geographical clustering of major corporate presences within the department.

🇫🇷 Hauts-de-Seine · 30 companies · Updated Nov 11, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [VINCI Concessions](https://www.tamtam.ai/c/vinci-concessions) (vinci-concessions.com)<br>A global leader in mobility infrastructure, designing, financing, building, operating, and maintaining airports, highways, and railway projects in 23 countries | Civil Engineering | 🇫🇷 Nanterre | 219,000 |  |
| 2 | [VINCI Airports](https://www.tamtam.ai/c/vinci-airports) (vinci-airports.com)<br>Operates, develops, finances, builds airports globally, optimizing performance, modernizing infrastructure, and driving environmental transition with a net-zero emissions goal. | Airlines and Aviation | 🇫🇷 Nanterre | 219,000 |  |
| 3 | [Orange](https://www.tamtam.ai/c/orange-issy-les-moulineaux) (orange.com)<br>A leading global telecommunications operator offering services to millions of customers and multinational companies across 26 countries | Telecommunications | 🇫🇷 Issy-les-Moulineaux | 146,935 |  |
| 4 | [Groupe Crédit Agricole](https://www.tamtam.ai/c/groupe-credit-agricole) (credit-agricole.com)<br>Leading European retail bank offering comprehensive financial services including loans, insurance, asset management, corporate banking, and customer-focused solutions. | Banking | 🇫🇷 Montrouge | 76,287 |  |
| 5 | [ENGIE](https://www.tamtam.ai/c/engie) (engie.com)<br>Global energy value chain operator, from renewable electricity production and green gas to infrastructure management and energy supply for diverse customers. | Renewable Energy Power Generation | 🇫🇷 La Garenne-Colombes | 45,706 |  |
| 6 | [Enedis](https://www.tamtam.ai/c/enedis) (enedis.fr)<br>They manage the public electricity distribution network across most of France, with nearly 39,000 employees maintaining and expanding the 13 million km network | Utilities | 🇫🇷 Puteaux | 24,479 |  |
| 7 | [Worldline](https://www.tamtam.ai/c/worldline) (worldline.com)<br>Helps businesses accelerate their growth journey quickly, simply, and securely with advanced payments technology, local expertise, and customized solutions. | Financial Services | 🇫🇷 Puteaux | 15,714 |  |
| 8 | [Crédit Agricole CIB](https://www.tamtam.ai/c/credit-agricole-cib) (ca-cib.com)<br>Corporate and investment bank, global financial services for large corporations and institutions, capital markets, structured finance, commercial banking, pioneering climate finance. | Banking | 🇫🇷 Montrouge | 14,647 | 2004 |
| 9 | [Framatome](https://www.tamtam.ai/c/framatome) (framatome.com)<br>Designs, services and installs components, fuel, and instrumentation and control systems for global nuclear power plants while providing digital and technical expertise. | Utilities | 🇫🇷 Courbevoie | 14,188 | 1958 |
| 10 | [Transdev](https://www.tamtam.ai/c/transdev) (transdev.com)<br>Provides safe, reliable, and innovative public transportation solutions globally, empowering daily freedom to move for millions of passengers across 19 countries, serving common good. | Urban Transit Services | 🇫🇷 Issy-les-Moulineaux | 13,519 | 2011 |
| 11 | [Orano](https://www.tamtam.ai/c/orano) (orano.group)<br>International operator in nuclear materials, provides high-value products and services across the entire fuel cycle, addressing energy and health challenges through expertise and innovation. | Nuclear Electric Power Generation | 🇫🇷 Châtillon | 12,605 | 2018 |
| 12 | [ENGIE Solutions France](https://www.tamtam.ai/c/engie-solutions-france) (engie-solutions.com)<br>Provides comprehensive, lasting solutions to businesses, industries, and communities for carbon neutrality, improving infrastructure competitiveness, city attractiveness, and living/working comfort. | Services for Renewable Energy | 🇫🇷 La Garenne-Colombes | 12,252 |  |
| 13 | [AXA en France](https://www.tamtam.ai/c/axa-en-france) (axa.fr)<br>A global leader in insurance, AXA protects 93 million clients worldwide with a range of products and services for individuals, professionals, and businesses | Insurance | 🇫🇷 Nanterre | 11,225 |  |
| 14 | [Societe Generale Corporate and Investment Banking - SGCIB](https://www.tamtam.ai/c/societe-generale-corporate-and-investment-banking-sgcib) (societegenerale.com)<br>Supports clients through expansion and challenges, offering tailored solutions, leveraging potential, and providing authentic advisory relationships for financial issues and risk management. | Financial Services | 🇫🇷 Nanterre | 10,078 | 1990 |
| 15 | [BNP Paribas Cardif](https://www.tamtam.ai/c/bnp-paribas-cardif) (bnpparibascardif.com)<br>Global leader in bancassurance and personal insurance, offering products and services through partnerships to over 80 million customers worldwide. | Insurance | 🇫🇷 Nanterre | 9,381 |  |
| 16 | [CACEIS](https://www.tamtam.ai/c/caceis) (caceis.com)<br>Provides asset servicing for asset managers and institutional investors, including execution, clearing, custody, fund administration, and middle-office outsourcing across continents. | Banking | 🇫🇷 Montrouge | 8,046 | 2005 |
| 17 | [Keolis Group](https://www.tamtam.ai/c/keolis-group) (keolis.com)<br>Global leader in shared mobility, co-constructing safe, smart, and sustainable public transport solutions including metros, tramways, buses, and various innovative services. | Ground Passenger Transportation | 🇫🇷 Courbevoie | 7,847 | 2001 |
| 18 | [Allianz France](https://www.tamtam.ai/c/allianz-france) (allianz.fr)<br>Offers comprehensive insurance, assistance, and financial services to individuals, professionals, businesses, and communities worldwide, with a strong presence in France. | Insurance | 🇫🇷 Puteaux | 7,227 | 1890 |
| 19 | [SAUR](https://www.tamtam.ai/c/saur) (saur.com)<br>A global company providing water and essential services, committed to protecting the environment and ensuring quality service for municipalities and cities worldwide | Environmental Services | 🇫🇷 Issy-les-Moulineaux | 6,850 | 1933 |
| 20 | [Africa Global Logistics](https://www.tamtam.ai/c/africa-global-logistics) (aglgroup.com)<br>Specializes in international transport, logistics, and supply chain management focused on supporting Africa's transformation and development. | Freight and Package Transportation | 🇫🇷 Puteaux | 6,706 | 2023 |
| 21 | [CNP Assurances](https://www.tamtam.ai/c/cnp-assurances) (cnp.fr)<br>Leading global insurer offering personal risk protection, savings, and pension solutions through multi-partnership models, promoting an inclusive and sustainable society. | Insurance | 🇫🇷 Issy-les-Moulineaux | 4,828 | 1959 |
| 22 | [Colas Rail](https://www.tamtam.ai/c/colas-rail) (colasrail.com)<br>Imagining innovative, eco-friendly railway solutions for global well-being and future challenges, collaborating internationally to achieve ambitious projects with passionate experts. | Railroad Equipment Manufacturing | 🇫🇷 Puteaux | 4,428 | 2008 |
| 23 | [CERBA HEALTHCARE](https://www.tamtam.ai/c/cerba-healthcare) (cerbahealthcare.com)<br>A leading player in medical diagnosis focusing on prevention, disease detection, early diagnosis, and personalized medicine to advance health worldwide | Hospitals and Health Care | 🇫🇷 Issy-les-Moulineaux | 4,406 |  |
| 24 | [DomusVi France](https://www.tamtam.ai/c/domusvi-france) (domusvi.com)<br>Provides elderly care through innovative therapies and social services while focusing on professional employee development to improve quality of life for residents. | Individual and Family Services | 🇫🇷 Suresnes | 4,373 |  |
| 25 | [INDIGO Group](https://www.tamtam.ai/c/indigo-group) (group-indigo.com)<br>Global provider of parking, individual mobility, digital solutions, and urban services with strong local presence in nine countries. | Consumer Services | 🇫🇷 Puteaux | 4,262 | 2015 |
| 26 | [IDEX](https://www.tamtam.ai/c/idex) (idex.fr)<br>Develops, designs, finances, builds, and operates local energy and carbon-free infrastructures for heat and electricity supply to buildings, cities, and industry. | Renewable Energy Power Generation | 🇫🇷 Boulogne-Billancourt | 3,940 | 1963 |
| 27 | [La Poste Mobile](https://www.tamtam.ai/c/la-poste-mobile) (lapostemobile.fr)<br>Provides affordable mobile telecom services with low-cost plans, accessible devices, extensive customer support, and promotes responsible digital usage for all ages. | Telecommunications | 🇫🇷 Chaville | 3,619 | 2011 |
| 28 | [Swiss Life France](https://www.tamtam.ai/c/swiss-life-france) (swisslife.fr)<br>Offers life insurance, private banking, financial management, health, provident, and damage insurance, empowering clients' financial independence. | Insurance | 🇫🇷 Puteaux | 3,187 | 1898 |
| 29 | [Groupe CCF](https://www.tamtam.ai/c/groupe-ccf) (groupeccf.fr)<br>French banking group provides retail banking services through branches and specialized financing for individuals and businesses across France, including overseas territories. | Banking | 🇫🇷 Courbevoie | 2,719 | 1917 |
| 30 | [Credit Agricole Leasing & Factoring](https://www.tamtam.ai/c/credit-agricole-leasing-and-factoring) (ca-leasingfactoring.com)<br>Specialized financing products for businesses, professionals, farmers, and local authorities including leasing, factoring, and renewable energy project support. | Financial Services | 🇫🇷 Montrouge | 2,715 |  |

## 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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## The same list elsewhere in France

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Source: https://www.tamtam.ai/l/critical-infrastructure-operators-hauts-de-seine