STM Group is comprised of 5 companies. PT. STM Tunggal Jaya is the holding company which has 30 ~ 100% of shares of 5 subsidiaries including 3 coal mining concessions(CEM, Korina Jaya, Alumuga). PT. CMS Kaltim Utama is the business provider as a mining contractor. PT. STM Coal Trading and PT. Multi Bahagia Bersama are in charge of coal trading and heavy equipment rental business. PT Batu Indah Mulia is the business parter for aggregate mining & trading at central Sulawesi.