PT Semen Indonesia (Persero) Tbk is an Indonesia-based holding company primarily engaged in cement manufacturing. The Company classifies its business into two segments: cement production and non-cement production. It operates its cement production business through its subsidiaries, namely PT Semen Padang, PT Semen Tonasa, PT Semen Gresik, Thang Long Cement JSC, Thang Long Cement JSC 2 and An Phu Cement JSC. The types of cement it produces include Ordinary Portland Cement; Portland Cement, including Type II, Type III and Type V; Special Blended Cement; Portland Pozzolan Cement; Portland Composite Cement, and Super Masonry Cement. Its cement manufacturing facilities are located in Indarung, Tuban and Pangkep, Indonesia and Quang Ninh, Vietnam. Its non-cement production business comprises coal, limestone and clay mining, cement sack manufacturing, ready-mix concrete manufacturing, industrial area leasing and information and communication technology (ICT) provisioning.