Mitihoon – The Securities and Exchange Commission (SEC) has issued regulations to enhance sustainability-related information disclosure of companies that issue securities and are listed on the Stock Exchange of Thailand (SET) (“listed companies”) in accordance with the International Sustainability Standards Board (ISSB) standards, effective from 2027, starting with the listed companies classified as constituents of the SET50 Index. The SEC has also prescribed five transition reliefs to support business sectors in appropriately adapting and developing data systems.
Following the SEC’s initiative to enhance sustainability-related information disclosure, including climate-related information, of the listed companies in line with the ISSB standards through a phased-in approach, together with transition relief measures that take into account consistency with international context as well as unity and alignment in corporate reporting, the SEC has revised the relevant reporting forms and registration statements to align with IFRS S1 and IFRS S2 issued by the ISSB, and has required the listed companies and their relevant entities to progressively disclose information in accordance with such standards,
These will begin with the listed companies that are classified as a constituent of SET50 in the December 2026 index review period to mandatorily report information for the year 2027, followed by the listed companies that are classified as a constituent of SET100 in the December 2027 index review period, to mandatorily report information for the year 2028. The requirements will subsequently be extended to all listed companies on the Stock Exchange of Thailand (SET) and the Market for Alternative Investment (mai), as well as Real Estate Investment Trusts (REITs), Infrastructure Funds (IFFs), Infrastructure Trusts (IFTs), and Property Funds (PFs) in the following phases, as detailed in the table below.
| Reporting Entities | Effective timeline | Reporting period |
| SET50: For December 2026 Index Review | 2027 | 2028 |
| SET100: For December 2027 Index Review | 2028 | 2029 |
| All listed companies on SET (including IPO) | 2029 | 2030 |
| All listed companies on mai and REITs/IFFs/IFTs/PFs (including IPO) | 2030 | 2031 |
To support the business sectors in appropriately adapting and developing data systems, the SEC has prescribed five transition reliefs, comprising the exemption from comparative information in the first year of reporting the disclosure of climate-related information, flexibility in the reporting timeframe, use of equivalent greenhouse gas emissions (GHG emissions) calculation standards and exemption from disclosure of Scope 3 GHG emissions during the initial period of implementation.
In addition, the SEC requires the disclosure of GHG emissions information to be verified by assurance providers in accordance with internationally accepted assurance standards, in order to promote the reliability of information disclosed to investors and the public.
The SEC has therefore issued nine related notifications* regarding the enhancement of sustainability-related information disclosures by the listed companies in accordance with ISSB standards. The notifications have been in effect since 26 October 2026. The SEC has also prepared the relevant reporting forms, the annual registration statement/annual report Form 56-1 One Report-S, as well as a disclosure manual for preparing the registration statement, as published on the SEC official website, to promote knowledge and understanding of sustainability-related financial disclosures in accordance with the ISSB standards.
In this regard, the SEC has implemented capacity building initiatives for the private sector’s readiness through training programs since 2024 and will continue to do so, and has also prepared disclosure manuals in collaboration with domestic and international strategic partners, in order to enhance capacity, knowledge, and understanding and to facilitate a smooth transition for the listed companies towards sustainability-related information disclosures in accordance with the ISSB standards.
Note: * The related notifications are as follows:
- Seven Notifications of the Capital Market Supervisory Board, comprising:
(1.1) No. Tor Jor. 24/2026 Re: Filing of Registration Statement for Securities Offering
(No. 23) https://publish.sec.or.th/nrs/11341p_r.pdf
(1.2) No. Tor Jor. 25/2026 Re: Rules, Conditions and Procedures for Reporting Disclosure of Information regarding the Financial Position and Operating Results of Securities Issuing Companies (No. 31) https://publish.sec.or.th/nrs/11347p_r.pdf
(1.3) No. Tor Jor. 26/2026 Re: Rules, Conditions and Procedures for Disclosure of Information relating to Financial Status and Operating Results of Foreign Company Issuing and Offering Shares (No. 8) https://publish.sec.or.th/nrs/11350p_r.pdf
(1.4) No. Tor Jor. 27/2026 Re: Provisions relating to Offer for Sale of Securities Issued by Foreign Company Whose Shares Have Been or Are Purposed to Be Traded on Foreign Exchange (No. 14) https://publish.sec.or.th/nrs/11353p_r.pdf
(1.5) No. Tor Jor. 28/2026 Re: Issuance and Offer for Sale of Units of Real Estate Investment Trusts (No. 25) https://publish.sec.or.th/nrs/11356p_r.pdf
(1.6) No. Tor Jor. 29/2026 Re: Issuance and Offer for Sale of Units of Infrastructure Trusts (No. 11) https://publish.sec.or.th/nrs/11358p_r.pdf
(1.7) No. Tor Jor. 30/2026 Re: Rules, Conditions and Procedures for Disclosure of Information of Mutual Funds and Property Investment Trusts and Infrastructure Investment Trusts (No. 14) https://publish.sec.or.th/nrs/11362p_r.pdf
- Two Notifications of the Office of the Securities and Exchange Commission, comprising:
(2.1) No. Sor Nor. 21/2026 Re: Prospectus for Offering of Investment Units of Property Funds (No. 4) https://publish.sec.or.th/nrs/11365p_r.pdf
(2.2) No. Sor Nor. 22/2026 Re: Prospectus for Infrastructure Fund (No. 5) https://publish.sec.or.th/nrs/11368p_r.pdf
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