The SK Group is one of the largest conglomerates in South Korea. It has more than 70,000 employees in 113 offices worldwide. Its core business is in the chemical, petroleum and energy industries, but it does operate in various other sectors. In 2007, the company reorganized into a holding company and operating company. The holding company, SK Holdings, focuses on 3 core business interests: Energy & Chemicals, Telecommunications, and Trading & Services. The SK Group is headquartered in Seoul, South Korea.