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Article 2
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When the TWSE discovers any of the following circumstances during daily trading hours ("the intraday session") through analyzing transactions of exchange-listed securities (excluding foreign bonds, government bonds, and straight corporate bonds), it will take measures pursuant to the provisions of Article 3 herein:
- Where, on trading volume of 3,000 trading units or more, the amplitude of change in the intraday transaction price exceeds 9 percent, while also exceeding the amplitude of change in the TWSE Capitalization-Weighted Stock Index by 5 percent or more.
- Where, on trading volume of 3,000 trading units or more, the percentage of increase or decrease in the intraday transaction price exceeds 6 percent, while also exceeding the percentage of increase or decrease in the TWSE Capitalization Weighted Stock Index by 4 percent or more.
- Where, on trading volume of 3,000 trading units or more, intraday turnover exceeds 10 percent, provided that this shall not apply to convertible bonds, bonds with non-detachable share options, preference shares with non-detachable share options, certificates of entitlement to new shares from convertible bond, call (put) warrants, share options, exchange-traded fund beneficial certificates and exchange-traded notes.
- Where trading information is announced or disposition measures adopted pursuant to these Directions.
- Where market rumors, media reporting, or TWSE computer analysis finds an irregularity, and signed approval is granted pursuant to a report of the incident.
- Other circumstances designated by the competent authority.
When calculating the price fluctuation limit of a security, if the formula includes factors such as the given underlying security or underlying index, the calculation is based on the intraday amplitude of price change, the difference between the percentage of increase or decrease in the price and the amplitude of the given underlying security or underlying index, and the percentage of increase or decrease in the price (for a basket of securities, the averages are calculated of the amplitudes of the underlying securities or underlying indexes of the basket of securities and of the percentages of increase or decrease in the price).
The provisions of subparagraphs 1, 2, and 3 of paragraph 1 concerning "on trading volume of 3,000 trading units or more" do not apply during a period of trading without price limits of an initial listing of ordinary shares.
When the trading volume of a security is below 1,000 units ("units" hereinafter collectively referring to shares, beneficial units, depositary receipt units, or other types of units), the numerical standards for the unit of the trading (or order) volume shall be adjusted according to the following formula:the adjusted numerical standards for the unit of trading (or order) volume = the pre-adjustment numerical standards for the unit of trading (or order) volume × (1000 ÷ the trading units of the given security).
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