The Société du Grand Paris (SGP) is a public agency established in 2011 by the French government to oversee the planning and construction of the Grand Paris Express, a major public transport project in the Paris metropolitan area. The agency is responsible for coordinating the project, which includes the construction of new metro lines, extensions of existing lines, and the renovation of existing stations. The SGP is headquartered in France and has a staff of approximately 1050 employees.