- Corporate Site of SK Group Companies
 - SK is Korea’s fourth largest conglomerate pursuing businesses in Energy & Chemical, Telecommunications, Logistics, Finance, Life Science, and E-businesses. - Hyundai Oil Bank
- Supplier of various types of petroleum products in Asia.
- Korea Gas Corporation (KOGAS)
- Contributing to the improvement of social welfare and the convenience of people's life through the long-term stable supply of natural gas.
- SK Corporation
- Involved in petroleum refining, oil exploration and production, LPG, coal mining, lubricants, and more.
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