GS칼텍스
Hyundai oil bank () is a petroleum and refinery company with its headquarters in Seosan, South Korea. It was established in 1964 as Kukdong Oil Industry Company () and later taken over by the Hyundai Group (1993). It is currently a part of the Hyundai Heavy Industries Group. Its primary business is petroleum products, similar to the SK Energy, GS Caltex, S-Oil.