This paper examines the association between insider trading before an earnings announcement and the magnitude of the post-earnings announcement drift (PEAD). Consistent with insiders' private information being incorporated into prices through their trading, we find PEAD is significantly lower...

This paper examines the association between insider trading prior to quarterly earnings announcements and the magnitude of the post-earnings announcement drift (PEAD). We conjecture and find that insider trades reflect insiders’ private information about the persistence of earnings news. Thus,...

Insider trading conveys insiders' private information to outsiders. This private information potentially benefits rival firms, which may reduce the competitive advantage of the insiders' firms. Using multiple approaches to identify proprietary information risk, we find proprietary costs are...