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Index Calculation Method
- Index Calculation Frequency
- The “Price Index” is calculated and disseminated every five seconds based on the latest trade prices of constituents during the trading hours of the TWSE's centralized securities exchange market, and the End-of-Day index is calculated once a day after the market close.
- The “Total Return Index” makes an adjustment by taking the cash dividend factor into consideration to reflect the return including reinvesting the cash dividend. The index is calculated and disseminated every five seconds based on the latest trade prices of constituents during the trading hours of the TWSE's centralized securities exchange market, and the End-of-Day index is calculated once a day after the market close.
- TAIEX compiled by TWSE is calculated by the following formula:
Index = Aggregate market value / Base value of the current day * 100
- The aggregate market value is the aggregate of the market values obtained by multiplying the trade price of each constituent by the number of issued shares of the current day.
If there is no trade price on the current day, the opening auction reference price of the current day may be used for calculation. However, stocks of newly listed companies included in the index calculation may be accounted for on the basis of the number of listed shares of the current date.
- Where listed stocks retained within the constituents in the period of suspended trading, the retained market value included in the calculation of the index is the market value obtained by the closing price and number of shares issued on the previous day of suspended trading. If the listed stocks are ex-dividend on the date of suspended trading, the retained market value included in the calculation of the index is the market value obtained by the closing price minus the amount of the dividend per share and number of shares issued on the previous day of suspended trading.
- The base of the index is the annual average at 1966, and the base value is 100 points.
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