This paper examines the association between ineffective internal control over financial reporting and the profitability of insider trading. We predict and find that the profitability of insider trading is significantly greater in firms disclosing material weaknesses in internal control relative to firms with effective control. The positive association is present in the years leading up to the disclosure of material weaknesses, but disappears after remediation of the internal control problems. We find insider trading profitability is even greater when insiders are more likely to act in their own self-interest as indicated by auditors’ weak “tone at the top” adverse internal control opinions and this incremental profitability is driven by insider selling. Our research identifies a new setting where shareholders are most at risk for wealth transfers via insider trading and highlights market consequences of weak “tone at the top”.

This study examines whether auditor KAM disclosures about M&A transactions predict future performance outcomes. We find that auditors make more M&A KAM disclosures when M&A transactions are larger, involve targets with greater information asymmetry, and are subject to greater overpayment risk. When auditors disclose M&A KAMs in the acquisition year, we find an increased risk of larger goodwill impairments and that the association between acquired goodwill and changes in companies’ subsequent operating performance are significantly lower compared to when auditors do not issue an M&A KAM. We also find that the likelihood of forced CEO turnover is incrementally higher when subsequent operating performance is poor and auditors issue an M&A KAM compared to when they do not. Collectively, our findings suggest that these auditor disclosures reflect uncertainty that predicts weak post-acquisition performance and forced CEO turnover, incremental to other indicators of failed acquisition strategies.