Do Companies With Effective Internal Controls Over Financial Reporting Benefit From Sarbanes–Oxley Sections 302 and 404?
研究了SOX法案第302条和第404条关于内部控制的披露对信息不对称和市场微观结构的影响，发现管理层报告（第302条）能降低买卖价差和价格波动、增加交易量，而审计师报告（第404条）效果不明显。
Post-SOX (Sarbanes–Oxley Act) academic research on internal control focuses on the characteristics of publicly listed companies disclosing material control weaknesses or the consequences experienced by these companies. However, to date, limited research has empirically examined whether these new disclosures truly enhance “public interest” by promoting “equity” in the capital markets through enhanced information distribution. In this article, we empirically investigate the impact these disclosures have on information asymmetry and related market micro-structure. We hypothesize that both the management’s and the auditor’s reporting on internal control provide outside investors additional and higher quality information about a firm’s future prospects, thereby reducing the information asymmetry in capital markets. Such reduction in information asymmetry should be reflected in decreased bid-ask spreads and price volatility, as well as increased trading volume. Our cross-sectional analyses show that, subsequent to the management’s report on internal control per Section 302, the information environment improves for U.S. firms as manifested by decreased bid-ask spread and price volatility, and increased trading volume. However, we find no similar results subsequent to the auditors’ reporting on a company’s internal control over financial reporting. In our time-series intervention analyses, about 70% of sample firms have experienced significant and permanent reductions in their bid-ask spreads subsequent to the implementation of Section 302 of SOX, in contrast to only 30% of firms subsequent to the implementation of Section 404 of SOX. Our findings point to the public policy issue of whether financial reporting quality of public companies can be improved at a lower cost.