Renault S.A. is a French automaker producing cars, vans, buses, tractors, and trucks, and, in the past, autorail vehicles. Due to its alliance with Nissan, it is currently the world's fourth largest automaker. Headquartered in Boulogne-Billancourt, Renault owns the Romanian automaker Automobile Dacia and the Korean automaker Renault Samsung Motors. The Lebanese-Brazilian Carlos Ghosn is the current CEO. The company's most successful car to date is the Renault Clio and the Renault Laguna, and its core market is France. The company is known for numerous revolutionary designs, security technologies, and motor racing.