PTT Public Co., Ltd. engages in exploration and production, liquefied natural gas, petrochemical and refining, oil and retail, power and utilities, coal, and service businesses. It operates through the following business group segments: Gas; Petroleum Exploration and Production; Coal; Oil; International Trading; Petrochemicals and Refining; New Business and Infrastructure; and Other. The company was founded on December 29, 1978 and is headquartered in Bangkok, Thailand.