Thailand Securities and Exchange Commission revises scope and phased timelines for ISSB-aligned sustainability disclosure by SET-listed companies

The Thailand Securities and Exchange Commission has revised its principles for sustainability-related information disclosure by companies that issue securities and are listed on the Stock Exchange of Thailand, adjusting the scope of reporting entities and effective timelines to allow more time for compliance preparation while keeping alignment with International Sustainability Standards Board requirements. Following a public hearing, the SEC maintained the core approach requiring listed companies to apply IFRS S1 and IFRS S2, with an initial climate-first phase focused on disclosing Scope 1 and Scope 2 greenhouse gas emissions and obtaining standardized, reliable assurance. Listed companies must engage assurance providers, which may include verifiers registered with the Thailand Greenhouse Gas Management Organization (Public Organization) or other verifiers conducting assurance in accordance with internationally accepted assurance standards. Application will be phased in with transition relief measures, and reporting entities will be classified using SET index groupings, including SET 50 constituents in the December 2026 index review and SET 100 constituents in the December 2027 index review. The SEC is amending relevant regulations and related documents and will communicate final versions once completed, alongside continued capacity-building measures such as training, workshops and disclosure manuals delivered with local and international partners.