PTT Public Company Limited, together with its subsidiaries, operates as a petroleum and petrochemical company in Thailand, other Asian countries, Europe, the United States, and internationally.

It operates through Upstream Petroleum and Natural Gas Business Group, Downstream Petroleum Business Group, and New Business and Infrastructure Group.

The company is involved in the exploration and production of petroleum; and natural gas procurement, pipeline transmission, distribution, and separation activities.

In addition, it engages in the exploration, production, and distribution of coal; and marketing of petroleum products and lube oil through an operating system of procurement, storage, and distribution of products, as well as the retail business at service stations.

Further, the company imports and exports petroleum and petrochemical products, as well as other related products; produces and distributes electricity, steam, and water for industrial purpose; and offers project management, human resource support, petroleum related technology, consultant management, technical consultant for electricity businesses, petrol station and convenience store management, factory maintenance and engineering, oil and gas, safety and environmental, and business services, as well as services for the storage and handling of liquid chemicals.

Additionally, it invests in liquefied natural gas business; produces and distributes chilled water/constructs and installs electricity generating systems; develops electricity power production projects; develops, markets, and distributes polymers products, by products, and other polymers-related products; develops real estate properties; operates vocational schools; and manufactures and distributes biochemical products, paraxylene, and industrial coatings and additives, as well as engages in the transportation, warehouse, and bagging packing management of polyethylene.

The company was founded in 1978 and is headquartered in Bangkok, Thailand.