The Stock Exchange of Thailand (SET) support development of the Thai capital market. As well as being a primary market for companies wishing to issue new securities (carry out an initial public offering), it is a liquid secondary market for securities to raise funds and win confidence of all stakeholders.

The main index is the SET INDEX.
A composite index calculated based on stock prices on the Main Board of the SET. It is a market capitalization weighted index which compares the current market value of all listed common stocks. Its calculation is adjusted in line with new listings, delisting, and capitalization changes.