Are Investors Confused by Restatements after Sarbanes-Oxley?
研究萨班斯-奥克斯利法案后会计重述是否让投资者困惑，通过股价反应和交易量分析，发现投资者并未被困惑，市场效率反而提高。
ABSTRACT: Regulators have expressed concern that investors are confused by the large number and questionable materiality of accounting restatements since passage of the Sarbanes-Oxley Act (SOX). This study looks for evidence of investor confusion by examining stock returns and trading volume. I find that the initial price reaction to restatement announcements becomes significantly less negative after SOX, even after controlling for the less egregious nature of post-SOX restatements. To assess whether the less negative reaction represents under-reaction, I test whether stock prices drift negatively over the months and years after the initial reaction. I find no evidence of statistically negative drifts unique to the post-SOX period. In fact, I find that post-SOX drifts are statistically less negative than pre-SOX drifts, suggesting that price efficiency actually improves after SOX. Finally, I find no evidence that post-SOX restatements have higher trading volume after controlling for contemporaneous returns, suggesting no increase in disagreement among investors about the restatements. Thus, the findings provide little evidence that investors are confused by post-SOX restatements.