Stock Exchange of Thailand

The Stock Exchange of Thailand, commonly abbreviated SET, is Thailand's principal organized securities-market operator. It provides the infrastructure and rules through which listed companies raise capital and investors trade equities, investment products and derivatives. The institution began operating on 30 April 1975 under the name Securities Exchange of Thailand and formally adopted its present English name on 1 January 1991. It is the sole national stock-exchange operator in Thailand, although its activities are organized across several distinct markets and subsidiaries. The group's core equity venue is the main SET market, which hosts the majority of Thailand's listed-company market capitalization. The Market for Alternative Investment, or mai, was introduced in 1992 to serve smaller and medium-sized businesses with listing needs different from those of larger established companies. LiVEx, launched in 2022, provides a lower-threshold venue for certain smaller companies and startups. The group also operates the Thailand Futures Exchange, or TFEX, a derivatives market established in 2004. Together, these venues give the Thai capital market separate channels for large-company equities, growth businesses, early-stage issuers and futures or other derivatives. SET's activities extend beyond order matching. The exchange maintains listing and disclosure requirements, publishes market and sector indices, disseminates prices and trading information, supports clearing and settlement arrangements through the wider Thai market infrastructure, and works with regulators and market intermediaries on investor protection and market integrity. Its widely followed benchmarks include the SET Index, SET50 and SET100. The SET Index is the principal broad measure of Thai equity performance, while SET50 and SET100 focus on large, liquid companies and are also used as references for investment products and derivatives. The exchange has progressively expanded access and technology. It moved to fully computerized trading in 1991, introduced mobile trading through Settrade Streaming for iPhone in 2010, and has supported products such as depository receipts that allow Thai investors to obtain exposure to foreign shares or indices without directly opening an overseas brokerage account. Thai regulators also permitted domestic individual investors to invest abroad directly through Thai brokers in 2008, broadening the relationship between the local market and global securities markets. SET serves domestic and international participants. Foreign investors from numerous jurisdictions hold Thai equities, while Thai investors increasingly allocate money outside the country. Regional cooperation among ASEAN exchanges has sought to make cross-border investment in Indonesia, Malaysia, the Philippines, Singapore, Thailand and Vietnam easier. At the same time, SET faces structural challenges, including relatively slow Thai economic growth, limited supply of large new listings, changing foreign-investor flows, competition from neighboring markets and concerns about the participation advantages created by sophisticated algorithmic trading. As of 8 April 2025, the main SET market had a reported market capitalization of approximately US$380.19 billion, excluding mai, based on the cited exchange-market comparison. The figure and ranking are time-sensitive rather than intrinsic characteristics of the institution. The market reached an intraday SET Index high of 1,852.51 on 27 February 2018, followed by a prolonged period of weaker performance and valuation reassessment. Despite those pressures, SET remains central to Thailand's corporate-finance system, providing the country's principal public venue for equity financing, price discovery and organized securities trading.

Thailand's modern securities-market institution emerged from government efforts to establish an organized national exchange. An initial securities-exchange concept had been discussed before the 1970s, but the decisive legal foundation came with the Securities Exchange of Thailand Act of 1974. The law created the framework for a formal exchange and enabled the organization that became the Stock Exchange of Thailand. SET commenced securities trading on 30 April 1975. Its creation gave Thailand a centralized venue for the trading of listed shares and helped move the country's capital market away from fragmented and less formalized dealing arrangements. During its early development, the exchange focused on building listing procedures, trading operations, member-broker arrangements, disclosure practices and the investor information needed for a functioning public market. Thailand enacted the Securities and Exchange Act of 1992 as part of a broader modernization of its securities industry. The legislation established the Securities and Exchange Commission as the principal regulator of Thailand's capital market and placed the exchange within a clearer institutional division between regulation and market operation. The post-1992 framework supported the development of stronger rules for public offerings, listed-company disclosure, securities businesses, market conduct and investor protection. SET expanded its role as Thailand's capital market grew. It developed electronic trading and market-information systems, broadened the range of listed sectors and improved the speed with which prices, disclosures, indices and trading information could be distributed. The exchange also supported a separate market for smaller and growth-oriented businesses, the Market for Alternative Investment, commonly called mai. This helped provide a possible public-market route for companies that did not fit the scale or profile of the main SET market. The Thai exchange ecosystem subsequently developed complementary institutions. Thailand Futures Exchange was established to provide a regulated derivatives market, while Thailand Securities Depository provides securities-depository and related post-trade services. These organizations, together with clearing and settlement arrangements and broker-dealer participants, form an integrated infrastructure around Thailand's securities markets. SET's development has been shaped by periods of strong economic growth, regional financial integration, market liberalization, technological change and financial stress. The Asian financial crisis of 1997–1998 tested Thailand's financial system and contributed to a continuing emphasis on supervision, disclosure, risk management and institutional resilience. Later global market disruptions and episodes of domestic volatility likewise led to improvements in trading controls, surveillance, circuit breakers, clearing practices and investor-protection mechanisms. In the 2010s and 2020s, SET increasingly emphasized electronic access, international connectivity, issuer quality, sustainability, investor education and the use of data and technology in market operations. It also introduced or supported changes involving short selling, securities borrowing and lending, program trading, disclosure and market surveillance. These measures reflected the exchange's dual need to maintain liquidity and efficient price discovery while limiting abusive or destabilizing conduct. Today, SET is Thailand's principal securities-exchange brand and a central component of the country's financial infrastructure. It operates the main equity market and supports associated markets and post-trade services through Thailand's exchange ecosystem. The exchange remains domestically focused but is open to international participation, and its performance is commonly followed through the SET Index, sector indices, trading statistics, listed-company disclosures and market-capitalization data. Its continuing institutional role is to provide a transparent and orderly marketplace through which companies can raise capital and investors can trade securities under Thailand's securities laws and exchange rules.

• 2004

  Thailand Futures Exchange established

  [5]Thailand Futures Exchange overviewtfex.co.th

  Thailand Futures Exchange was established as Thailand's organized derivatives-market venue within the broader exchange ecosystem.

• 1999

  Market for Alternative Investment established

  [4]Market for Alternative Investment overviewset.or.th

  The Market for Alternative Investment, or mai, was established as a venue oriented toward smaller and growth-oriented businesses.

• 1992

  Securities and Exchange Act reshaped the regulatory framework

  [3]Securities and Exchange Commission Thailand historysec.or.th

  Thailand adopted the Securities and Exchange Act, creating the Securities and Exchange Commission and strengthening the institutional framework for securities-market supervision.

• 1975

  Trading began

  [1]Stock Exchange of Thailand overviewset.or.th

  The exchange began securities trading on 30 April 1975, establishing SET as Thailand's organized national equity marketplace.

• 1974

  Securities Exchange of Thailand Act enacted

  [1]Stock Exchange of Thailand overviewset.or.th

  Thailand enacted the legislation that provided the statutory foundation for a formal national securities exchange.

Thailand's national and primary organized capital-market platform, serving large listed companies, growth businesses, domestic investors and international participants.

• Equity exchange · 1975

  Stock Exchange of Thailand market

  The main SET market provides listing and secondary-trading facilities for Thai public companies across a wide range of industries. It disseminates prices, trading information, issuer disclosures and market indices, and operates under exchange rules covering admission, trading, market conduct and continuing obligations.

• Growth-company equity market · 1999

  Market for Alternative Investment

  The Market for Alternative Investment, known as mai, is a Thai public equity venue intended to provide smaller and growth-oriented businesses with access to the capital market. It has its own admission framework while remaining part of the SET group of markets.

• Market index · 1975

  SET Index

  The SET Index is the principal broad benchmark associated with Thailand's main stock market. SET also publishes sectoral and other indices used by investors, analysts, issuers and financial-product providers to monitor market performance.

• Derivatives exchange · 2004

  Thailand Futures Exchange

  Thailand Futures Exchange, or TFEX, provides organized trading in derivatives linked to financial and other underlying instruments. It complements SET's cash-equity market by offering instruments for hedging, investment and price discovery.

• Securities depository

  Thailand Securities Depository

  Thailand Securities Depository provides securities-depository and related post-trade services for Thailand's capital market. Its infrastructure supports the holding, transfer and settlement processes associated with exchange-traded securities.

• Investor education and financial-literacy programs

  Thailand

  SET conducts investor-information and financial-literacy initiatives intended to improve public understanding of securities, risk, disclosure and responsible participation in the capital market.

  Outcome. Ongoing investor-education activity supports broader and more informed participation, but a single campaign outcome is not specified.

  Source
• Sustainability and ESG market-development initiatives

  Thailand

  SET promotes sustainability reporting, responsible investment and ESG-related market practices among listed companies and investors as part of its capital-market-development role.

  Outcome. The initiatives have supported the availability of sustainability information and ESG-oriented market products, without one separately documented campaign result.

  Source

• 2024

  Tightening of short-selling and program-trading controlsStrategy

  Background

  Thai market participants and authorities faced concerns about equity-market confidence, volatility, liquidity and the effect of short selling and automated trading on price formation.

  Action taken

  SET and related Thai capital-market authorities introduced or strengthened measures involving short selling, securities borrowing and lending, program trading and market surveillance, including an uptick-style control for short sales.

  Aftermath

  The measures were intended to improve orderly trading and investor confidence while preserving market liquidity and price discovery.

  Source

• 2025

  SET market capitalization reported at approximately US$380.19 billion[9]SET市值报告约为3801.9亿美元en.wikipedia.org

  Other

  The reported market capitalization of the main SET market, excluding mai, was approximately US$380.19 billion as of 8 April 2025. The cited comparison placed it among the largest exchanges globally and third among ASEAN exchanges by market capitalization at that date.

• 2024

  Thailand introduced an uptick-rule framework for short selling[8]Tightening of short-selling and program-trading controlsset.or.th

  Regulation · Other

  Thai market authorities introduced tighter short-selling controls, including an uptick-style requirement, as part of measures intended to strengthen market confidence and reduce destabilizing trading pressure. The changes affected trading rules and market participants operating through SET infrastructure.

• 2024

  SET and Thai market authorities pursued measures to improve market confidence[8]Tightening of short-selling and program-trading controlsset.or.th

  Regulation · Other

  The exchange and related Thai capital-market authorities worked on measures covering short selling, program trading, disclosure, investor protection and market surveillance in response to concerns about liquidity, volatility and confidence in the domestic equity market.

• 2022

  SET introduces LiVEx for smaller businesses and startups[9]SET市值报告约为3801.9亿美元en.wikipedia.org

  Product launch

  The LiVEx market began operating as an additional equity venue with lower listing requirements intended for certain smaller companies and startups.

• 2018

  SET Index reaches a record intraday high[9]SET市值报告约为3801.9亿美元en.wikipedia.org

  Other

  The SET Index reached an intraday high of 1,852.51 on 27 February 2018, exceeding its prior recorded peak of 1,789.16 from January 1994.

• 2018

  SET and TFEX expand access to overseas-linked products[9]SET市值报告约为3801.9亿美元en.wikipedia.org

  Product launch

  Depository receipts became available from 2018, giving Thai investors a locally traded instrument linked to selected foreign securities or indices.

1. 1Stock Exchange of Thailand overviewset.or.th
2. 2Stock Exchange of Thailand official websiteset.or.th
3. 3Securities and Exchange Commission Thailand historysec.or.th
4. 4Market for Alternative Investment overviewset.or.th
5. 5Thailand Futures Exchange overviewtfex.co.th
6. 6Investor education and financial-literacy programsset.or.th
7. 7Sustainability and ESG market-development initiativesset.or.th
8. 8Tightening of short-selling and program-trading controlsset.or.th
9. 9SET市值报告约为3801.9亿美元en.wikipedia.org
10. 10SET debuts ‘SE 101’ curriculum at universitiesnationthailand.com
11. 11SET wins two international awards, enhancing leadership position inryt9.com