Thales Group (French: [talɛs]) is a French multinational company that designs and builds electrical systems and provides services for the aerospace, defence, transportation and security markets. The headquarters are in Neuilly-sur-Seine (in the suburbs of Paris), and its stock is listed on the Euronext Paris.The company changed its name to Thales from Thomson-CSF in December 2000 shortly after the £1.3 billion acquisition of Racal Electronics plc, a UK defence electronics group.