SK Holdings Co., Ltd. is a Korea-based holding company engaged in the management of its subsidiaries. As of December 31, 2011, it had eight subsidiaries: SK Innovation Co., Ltd., engaged in the oil and chemical business; SK TELECOM CO., LTD., engaged in the provision of telecommunication services; SK Networks Company Limited, engaged in the trading of petroleum products, steels, communication devices and others; SKC LTD., mainly engaged in the manufacture of synthetic resins; SK Engineering & Construction Co., Ltd, engaged in the construction and civil engineering business; SK SHIPPING CO., LTD, engaged in the marine transportation business; SK E&S CO., LTD., engaged in the operation of gas plants, as well as power generation business, and SK BioPharm Co., Ltd., engaged in the life science business. On November 23, 2012, it acquired additional shares of SK China Company Limited. After the transaction, the Company's stake in SK China Company Limited increased to 64.2% from 16.2%.