SET approves 8 new trading measures, effective 16 Nov 2026
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The Stock Exchange of Thailand (SET) is preparing to enforce a revised set of eight securities trading measures starting from 16 November 2026, following a public consultation in May and approval from the Securities and Exchange Commission (SEC). Asadej Kongsiri, a board member and manager of the SET, said the package aims to balance market liquidity and stability, reduce trading costs for all investor groups, and regulate based on actual trading behaviour. Key measures include reducing the minimum tick size for stocks priced between 5 and 50 baht per share; adjusting the short-selling criteria in normal market conditions to a Zero-Plus Tick rule, but switching to an Uptick rule on the next trading day if a stock closes down 10% or more from the previous day; and permitting short selling only in highly liquid securities, namely SET100 index stocks, underlying securities of Single Stock Futures, as well as DRs and ETFs. On regulating high-frequency trading (HFT), the SET will revise its registration criteria by considering both the use of dedicated order-routing channels (Dedicated API) and the characteristics of HFT trading, and will collect an extra charge from accounts whose order-to-trade ratio (OTR) exceeds 50 times and whose average order submissions exceed 50 per minute, charging only on the portion of orders exceeding 15,000 per day at a rate of 0.15 baht per order. In addition, it will abolish the per-security Dynamic Price Band, remove restrictions on the types of securities that HFT investors may trade, and scrap the minimum resting time requirement for orders. Investors can study further details of the criteria on the website www.set.or.th under the rules and supervision section.