SK Holdings Co., Ltd. is a Korea-based company principally engaged in the petroleum business. The Company engaged in the petroleum businesses, mobile communication services, energy and information technology distribution and construction businesses through subsidiaries including SK Innovation Co., Ltd., SK TELECOM CO.,LTD, SK Networks Company Limited, SK Engineering & Construction Co.,Ltd., SK E&S Co., Ltd. and others. SK Innovation Co., Ltd. is a holding company operates businesses related to petroleum and chemistry. SK TELECOM CO.,LTD provides mobile communication services of voice and data. SK Networks Company Limited is engaged in the businesses of energy and information technology distribution as well as car rental. SK Engineering & Construction Co.,Ltd. engages in the businesses of infrastructure, building and residence as well as plant construction. SK E&S Co., Ltd. is mainly engaged in the gas company and combined cycle power generation business.