Alstom SA is a French multinational rolling stock manufacturer, which operates worldwide in rail transport markets, active in the fields of passenger transportation, signalling, and locomotives. The company develops and markets mobility solutions that provide sustainable foundations for the future of transportation. The range of products includes high-speed trains, metros, monorail and trams to integrated systems, customised services, infrastructure, signalling and digital mobility solutions. In addition, Alstom supplies rolling stock, transport infrastructure and signalling, maintenance equipment and global rail systems.

Alstom is present in 70 countries and employs over 70,000 people. On January 29, 2021, Alstom completed the acquisition of Bombardier Transportation, strengthening the company's global position in the booming mobility market. Group’s combined proforma revenue amounts to €14 billion for the 12-month period ended March 31, 2021.