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Article 54
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Where the overall collateral maintenance ratio of the customer margin account is lower than 130 percent, the securities firm shall issue a margin call to the customer demanding the deposit, within two business days from the day the margin call is received, of additional margin collateral for the margin purchase or short sale that falls below the collateral maintenance ratio, to cover the margin deficiency.
Margin deficiencies that a customer is required to cover under the preceding paragraph shall be calculated by the following formulas:
■ deficiency in margin for margin purchase = original margin purchase amount - (closing price on the day of calculation × number of shares purchased on margin × margin purchase leverage ratio) - (par value, closing price and average closing price of the day of calculation or net asset value per beneficiary unit of the prior business day × unit number of shares of the stock under paragraph 3 and securities deposited as collateral or other merchandise under Article 57 × margin purchase leverage ratio)
■ deficiency in margin for short sale = (closing price on the day of calculation × number of shares sold short × margin percentage required for short sale - initial margin for short sale) + (closing price on the day of calculation × number of shares sold short - original short sale proceeds) - (par value, closing price and average closing price of the day of calculation or net asset value per beneficiary unit of the prior business day × unit number of shares of the securities deposited as collateral under Article 57 or other merchandise).
In the formula for calculating the deficiency for margin purchase under the preceding paragraph, if the stock under paragraph 3 of the preceding article or the securities deposited as collateral or other merchandise under Article 57 are categorized as book-entry central government bonds, local government bonds, corporate bonds, financial bonds, gold that is registered for trading over the counter, an open-end type securities investment trust fund beneficiary certificate and futures trust fund beneficiary certificate, its financing ratio shall be calculated based on the maximum financing ratio of TWSE or TPEx listings announced by the competent authority; for others that are not eligible for margin purchase or short sale under Article 2 or 3 of the Standards Governing Eligibility of Securities for Margin Purchase and Short Sale or are temporarily suspended under Article 4 or 5 of the same Standards, then the margin purchase leverage ratio shall be set at zero.
Where trading of securities has been suspended or halted, the collateral maintenance ratio in paragraph 1 of the preceding article and the margin deficiencies required to cover in paragraph 2 of this article shall be calculated based on the closing price of the business day immediately before suspension or halting of trading.
For purposes of calculation of the collateral maintenance ratio in the preceding article and the margin deficiencies that a customer is required to cover in paragraph 2 of this article, if a closing price is not available for the given day, it shall be calculated as the price determined by the following principles:
- When the highest buy price quoted as of market close on the given day is higher than the auction reference price at market opening on the TWSE or the basis price for the opening of trading on the TPEx, the highest buy price quoted will be the price.
- When the lowest sell price quoted as of market close on the given day is lower than the auction reference price at market opening on the TWSE or the basis price for the opening of trading on the TPEx, the lowest sell price quoted will be the price.
- When the above circumstances are not met, the auction reference price at market opening on the TWSE or the basis price for the opening of trading on the TPEx will be the price.
The terms "the auction reference price at market opening" and "the basis price for the opening of trading" in the preceding paragraph shall have the meaning specified in Article 58-3, paragraph 4 of the TWSE Operating Rules, or Article 60-1 of the TPEx Trading Rules.
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