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Article 15
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The trade volume of TWSE or TPEx listed securities is deemed excessively irregular as in Article 8, paragraph 1, subparagraph 3, item 3 under any of the following circumstances:
- The turnover of the securities in the sampling period specified in Article 12 is at least 10 times the average turnover of the samples for the same period as mentioned in Article 13.
- The turnover rate of the securities in the sampling period specified in Article 12 is lower than 10% of the average turnover rate of the samples for the same period as mentioned in Article 13, and the trading volume in said period is less than 3,000 share certificates or 3,000 units.
- If the proviso of item (1), subparagraph 5, paragraph 2, Article 8 applies to the TPEx-listed securities, their turnover rate in the sampling period specified in Article 12 reaches twice or more of the average turnover rate of securities of the same industry in the TPEx market in the same period; paragraph 3 of the preceding article will apply mutatis mutandis if there are no securities of the same industry in the TPEx market.
- Other circumstances where the trade volume may be deemed excessively irregular.
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Article 26
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The TWSE or TPEx will review each day the prices and trade volumes of TWSE or TPEx securities eligible for margin purchase and short sale, and will reduce the margin purchase leverage ratio by 10% and raise the short sale margin by 10% on the following business day in the event of excessively intense share price volatility or excessively irregular trade volume for five consecutive business days or six out of the last ten business days, or in the event of excessively concentrated equity or beneficial ownership as disclosed by information relating to the equity of a TWSE or TPEx listed company or foreign issuer holding an ordinary shareholders' meeting or to the beneficial rights of a securities investment trust enterprise holding a fund beneficiaries meeting. Whether the above occurs contemporaneously or successively, the margin purchase leverage ratio will be reduced by 10% and the short sale margin raised by 10% only, upon such occurrence.
The preceding paragraph does not apply to ETF beneficial certificates, offshore ETF beneficial certificates, and futures ETF beneficial certificates.
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Article 27
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The sampling period in regard to excessively intense share price volatility or excessively irregular trade volume as prescribed in the preceding article is 30 business days prior to the date of review (inclusive) for purposes of data gathering.
The business days in the preceding paragraph are calculated in accordance with Article 121, paragraph 2.
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Article 28
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The scope of securities samples for excessively intense share price volatility or excessively irregular trade volume as mentioned in Article 26 is governed by Article 13 mutatis mutandis for purposes of comparison with underlying securities.
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