Event study analysis is applied to investigate stock price reaction to the announcement of bonus issues for the emerging stock markets of China. Results show that the issues with a high bonus ratio (number of bonus shares in the issue/number of existing shares) usually attract positive returns and the issues with a low bonus ratio are rewarded with negative returns. The A-shares and B-shares prices exhibit some similarities in their reactions to bonus issues approvals. The hypothesis of semi-strong form market efficiency is rejected only partly for Chinas stock markets.
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