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We find that firms reporting internal control material weakness (ICW) under Section 404 of Sarbanes–Oxley Act (SOX) have 13% lower valuation than non-ICW firms based on Tobin's q. This valuation difference is mainly driven by stock underperformance of more than 13% during the year before ICW disclosure. The ICW firms that remedy the internal control weakness in the subsequent year have much better...
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