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Société Nationale SNCF engages in train operation business, passenger and freight transport. Its business segments offers mobility services through his trains and commercial brands: Intercités, Ouigo, RER, TER, TGV, TGV and Transilien. The company was founded on January 1, 1938 and is headquartered in Saint Denis, France.

Société du Grand Paris is a company based in Saint-Denis, France. The French company is the project owner of the Grand Paris Express, a major infrastructure project in the Paris region. The company is ultimately controlled by the City of Paris. The company was founded in 2010 by Patrick Devedjian. Jean-François Monteils has been the CEO of the company since 2021.

Caisse Nationale des Autoroutes provides financial services to road development services. It raises finance for the building and development of toll motorways. The company was founded in 1963 and is headquartered in Paris, France.

Grand Paris Aménagement is a private company based in Paris, France that provides real estate development services.

The Conseil régional d'Île-de-France is a government organization based in Paris, France. The organization is responsible for implementing various actions, aids, and projects in the Île-de-France region, particularly in the areas of transport, employment, and education. Additionally, the organization offers learning and internship opportunities in the region.

Systra SA provides civil engineering and construction services. It develops and operates public transportation infrastructure, such as tram systems, bus lines, metro lines, and high-speed railways. The firm provides design, consulting and project management, implementation and maintenance services. The company was founded in 1957 and is headquartered in Paris, France.

Part of HOPPS Group SAS, IDF is a French company that specializes in providing housing diagnosis services in Saint-Maur-des-Fossés. The company is based in Paris, France. The company offers all compulsory real estate diagnoses for owners or private donors, including asbestos, termites, lead, electric, gas, and natural risks. IDF was acquired by Milee SAS, part of HOPPS Group SAS from January 05, 2017 on February 15, 2001.

Île-de-France de Mobilités designs, organizes, and finances the public transportation used by residents across the greater Paris region. It also funds modernization projects and infrastructure upgrades to roads and railways. The company is headquartered in Paris, France.

Business France provides expertise for business development and project development. It offers decision making support, communication design, development, and dissemination, government aid, and providing international internship program. The company was founded on January 1, 2015 and is headquartered in Paris, France.

Apave SA specializes in tests for quality control. The company was founded in 1867 and is headquartered in Paris, France.

Commissariat à l'Energie Atomique et aux Energies Alternatives EPIC provides research, development, and innovations solutions. It specializes in the following areas: defense and security, low carbon energies, technological research for industry, and fundamental research in the physical sciences and life sciences. The company was founded in 1945 and is headquartered in Paris, France.

La Banque Postale SA operates as a state-owned postal bank. The firm offers demand deposits, current accounts with debit cards, home loans, personal accident, and life insurance products. It also provides a range of security services for account management. The company was founded on December 31, 2005 and is headquartered in Paris, France.

Compagnie Nationale du Rhône SA produces and distributes electricity. The firm specializes in hydropower generation. It also engages in engineering activity. The company was founded in 1933 and is headquartered in Lyon, France.

Aéroport Marseille Provence SA engages in the provision of airline services. The company was founded on December 19, 2012 and is headquartered in Marseille, France.