Thai Oil Public Company Limited or simply Thaioil () is a Thai

public company A public company is a company whose ownership is organized via shares of share capital, stock which are intended to be freely traded on a stock exchange or in over-the-counter (finance), over-the-counter markets. A public (publicly traded) co ...

. It is listed on the

Stock Exchange of Thailand The Stock Exchange of Thailand (, ; SET) has been the sole stock exchange operator in Thailand since its establishment on 30 April 1975. As of 8 April 2025, with a market capitalization of US$380.19 billion (excluding mai) at an exchange rate ...

(SET). It is a subsidiary of PTT Group. The company was founded on 3 August 1961 as Oil Refinery, Ltd. Thaioil is the largest oil refinery in

Thailand Thailand, officially the Kingdom of Thailand and historically known as Siam (the official name until 1939), is a country in Southeast Asia on the Mainland Southeast Asia, Indochinese Peninsula. With a population of almost 66 million, it spa ...

References

{{reflist Oil and gas companies of Thailand Companies based in Bangkok Energy companies established in 1961 Non-renewable resource companies established in 1961 1961 establishments in Thailand PTT group Companies listed on the Stock Exchange of Thailand Companies in the SET50