On May 26, 2011, the Korea Fair Trade Commission (‘KFTC’) imposed a total surcharge of KRW 434.8 billon against four oil refiners (SK Co, GS Caltex Corp, Hundai Oilbank Corp, and S-Oil Corp) for using the so-called ‘Original Distributor Control System’. Under this market sharing arrangement, the cartel participants agreed to not compete for gas stations that distribute their products. Consequently, a refiner could not supply oil to its rivals’ distributors without the consent of the relevant rival refiner. This was done to ensure a stable market share for all players. In addition to the fine, the KFTC also referred three of the players (SK, GS Caltex and Hundai Oilbank) for prosecution for criminal enforcement.