June 29, 2026
Thailand’s Securities and Exchange Commission (SEC) is seeking public input on significant amendments to the Securities and Exchange Act B.E. 2535 (1992) that would address recurring market abuses and eroded investor confidence observed by the SEC. Published on June 24, 2026, the consultation document targets share-pledging disclosure failures, hidden beneficial ownership, and fraudulent transactions by listed companies, all of which are issues that have threatened share prices and market stability across the Thai capital markets. Comments on the proposals are due by July 24, 2026.
Mandatory Disclosure of Short Sales and Share Pledges
The draft amendments introduce new reporting obligations for both short sales and share pledges. Persons who sell listed securities without having such securities in their possession (“short sales”) must comply with rules prescribed by the Capital Market Supervisory Board, ensuring standardized practices and preventing risks from such transactions. Major shareholders who pledge or encumber their shares in significant amounts must report those arrangements to the SEC, which may then disclose the information to the public.
These amendments directly respond to recent market abuses, including short selling without proper safeguards and instances where directors or major shareholders have pledged large share blocks without disclosure to investors, only to have those shares forcibly sold when collateral was called, causing dramatic share price declines and disrupting ownership structures and market stability.
Reportable transactions for share pledges include the following:
Shares used as margin account collateral
Shares pledged as loan security, with immediate transfer upon default
Shares formally pledged under the Civil and Commercial Code or registered with the Thailand Securities Depository
Failure to report share pledges triggers criminal penalties, as does failure to comply with short sale requirements. By requiring advance disclosure and standardized short sale procedures, the SEC aims to enable investors to assess ownership stability and default risk before share prices collapse, while ensuring fair