Taiwan Stock Exchange said Chang Guang, Thunder Tiger and Ming Hui-DR will be placed under trading restrictions from Aug. 18 through Aug. 24, covering five trading sessions, with all three shifted to manual order matching every two minutes. The move follows abnormal trading signals tied to sharp price swings, heavy turnover and valuation metrics that diverged significantly from sector norms. Chang Guang triggered the exchange's volatility thresholds after its closing price rose a cumulative 26.01% over the latest six trading sessions, with a NT$92 spread between the first and last closing prices in that period. Thunder Tiger, a drone-themed stock, was flagged after multiple indicators were breached at the same time, including a price-to-earnings ratio of 398.96x, a price-to-book ratio of 9.69x, a daily turnover rate of 20.15%, KGI Securities sell-side volume above NT$100 million, or 27.37% of the stock's trading value that day, a single investor's sell-side volume above 10% of total trading value and more than NT$100 million, a price-to-book ratio more than four times the sector average, and a six-session cumulative turnover rate of 55.20%. Ming Hui-DR, a depositary receipt, was placed under the same measures, underscoring broader oversight across different securities products. The exchange also added 32 listed and OTC stocks to its watch list. Analysts said the restrictions do not ban trading but typically reduce liquidity, slow execution and raise costs for short-term trading, which can help curb overheated sentiment. The backdrop includes buying in defense-related names after the Legislative Yuan passed drone-related budgets last week, though the exchange's action suggests concern that recent gains, especially in Thunder Tiger, have outrun fundamentals.