Hellenic Petroleum S.A. is one of the largest oil companies in the Balkans and with its roots dating to 1958 with the establishment of the first oil refinery in Greece (Aspropyrgos). It adopted its current name in 1998, changing from the Public Petroleum Corporation S.A. (DEP), as the result of a corporate reorganization. It is a consortium of 9 subsidiaries and a number of additional companies of which it has varying degrees of management control.