ACO, C.A. is a Venezuelanholding company for an umbrella organization of over eighty companies engaged in a wide variety of industries throughout Venezuela predominately in the automotive industry. It is best known for the sale, servicing and leasing of automobiles nationally. It was founded starting 1951 by Albert Tattar along with Harry Männil and Arnold Orav, and with the financial backing of Alcoa Aluminum Corp. (majority shareholder), the Mendoza family (Polar Group), the Tamayo family (largest Venezuelan liquor distributor et al.), and other prominent Venezuelan investors. The company was initially presided over by Albert Tattar. It emerged in the 1970s as the world's largest tractor dealership as the dealer for John Deere Tractors in Venezuela. It also became the largest automobile dealership in South America, according to the Ford Motors Company (USA). a significant contributor to the success of the Grupo Aco was the innovative introduction in Venezuela of in-house auto sale financing using a captive finance company. Whereas Grupo Aco had equity stakes in a great number of companies, the balance of ownership of many of these companies was held by Grupo Aco shareholders. As a result, Grupo Aco commanded a larger market share than would be suggested only by its totally owned companies. The leadership of the conglomerate passed to Harry Männil in 1972. Under his direction, the group continued to expand and prosper. It attained US $900 million in sales during 1973 and ranked as the most profitable private sector company in the nation that year. Changes in Venezuela's economy and political environment during the early 1980s caused a downturn for many large businesses in Venezuela. In the case of the Aco Group, a financial crisis emerged as motor vehicle sales plummeted. By 1993, the Aco Group was forced into reorganization and a restructuring of the entire group.