Information disclosure prior to opening is implemented by Indonesian stock exchange for improving the pre-market information closure transparency. Based on the policy, information related to the bid/ask volume, five best bid/ask prices, trading volume, and transaction price is disclosed. In this study, investigation is made about the influence of pre-market information on the market quality measures including volatility, liquidity, and trading volume. Intraday day data is collected within the

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... ening of first five minutes or one minute in selected months. Results of the study indicate that pre-market information disclosure transparency is influencing the market quality measures significantly.