STMicroelectronics NV (commonly referred to as ST or STMicro) is a European multinationalsemiconductor contract manufacturing and design company. It is the largest of such companies in Europe. It was founded in 1987 from the merger of two state-owned semiconductor corporations: Thomson Semiconducteurs of France and SGS Microelettronica of Italy. The company is incorporated in the Netherlands and headquartered in Plan-les-Ouates, Switzerland. Its shares are traded on Euronext Paris, the Borsa Italiana and the New York Stock Exchange.