Romgaz is the largest natural gas producer and the main supplier in Romania. It is a joint stock company whose majority shareholder is the Romanian State owning a 70% stake. The company is listed on Bucharest Stock Exchange and GDRs are transacted on London Stock Exchange. The company has a vast experience in the field of gas exploration and production and a history that began in 1909 with the discovery of the first commercial gas reservoir in the Transylvanian Basin by drilling well Sarmasel. Romgaz undertakes geologic research in order to discover new gas reserves, produces methane by exploiting the reservoirs included in the company portfolio, stores natural gas in the underground deposits, interventions, workover and special operations on wells and technological transport.