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Relevant Laws

Title:Operating Rules for Securities Firms Handling Margin Purchases and Short Sales of Securities (2023.08.17)
Article 12     The sampling period of excessively intense share price volatility or excessively irregular trade volume as mentioned in Article 8, paragraph 1, subparagraph 3, item 1 or 3 is 90 business days prior to the date of review (inclusive) for purposes of data gathering.
    The business days mentioned in the preceding paragraph are the trading days of the particular security.
Article 26     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.