Hellenic Petroleum S.A. is the largest oil refining company in Greece 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.
Key people are John Costopoulos and Anastasios Giannitsis.