Private Information Trading and Enhanced Accounting Disclosure of Bank Stocks
PRIVATE INFORMATION TRADING AND ENHANCED ACCOUNTING DISCLOSURE OF BANK STOCKS Rocco Huang1 The World Bank, and the University of Amsterdam Abstract In this study, price-volume patterns of traded bank stocks in 47 countries around the world are examined, to study whether enhanced accounting information disclosure is associated with lower information asymmetry between informed and uninformed investors in the trading of bank stocks, as measured by Llorente et al. (2002)’s private information trading (PIT) indicator. The study finds that, the second pillar of Basel II, stronger supervisory power, is surprisingly associated with more private information trading (although we do not argue for causality in either direction). In contrast, the third pillar (information disclosure) of Basel II is found to be quite effective in reducing private information trading in bank stocks. We find that bank- level enhanced disclosures of accounting information (such as classification of loans or deposits by maturity), as defined by a composite index proposed by Nier (2005), is associated with significantly less PIT, and the magnitude of the effect is large enough to counteract the influence of existing national policies. Finally, we also find that level of PIT is not higher in bank than in their size-matched nonfinancial stocks, which suggests that banks may not be special when it comes to information asymmetry. 1 I especially want to thank Stijn Claessens for his numerous comments, suggestions, and encouragement, which help substantially improve this paper. I appreciate valuable comments from Vidhi Chhaochharia, Luc Laeven, and participants at a seminar in the World Bank. This paper’s findings, interpretations and conclusions are entirely those of the author and do not necessarily represent the views of the World Bank, its Executive Directors or the countries they represent.
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