The Stock Exchange of Thailand's board has approved changes to short-selling rules (Uptick Rule, the list of shortable stocks), removal of per-stock Dynamic Price Band, registration of high-frequency traders, and scrapping of the Minimum Resting Time measure. The SEC's approval is expected in September-October 2026. For a typical SME owner this only matters if you invest in or hold listed shares, or your business depends on the stock market. No operational action is needed now.