Do insiders have inside tracks: An examination of Wall Street Journal's Inside Track columns?

摘要

This study investigates how the stock market reacts to the publications of the Wall Street Journal's "Inside Track" columns in two distinct time periods, 1988 to 1993 and 2002 to 2004. It first examines the stock return behavior during the trading period, the filing period, and the publication day for firms appeared in the Inside Track columns in the period of 1988 to 1993 and then provides a validity test with a sample from 2002 to 2004. The evidence indicates that the market tends to under-react to the insider trading information and insiders tend to be information-motivated traders. The significant filing period returns along with significant publication period returns are consistent with the gradual price adjustment argument. The study also finds that market reactions to the publications are significantly related to insider trading when the trades involve the board chairman.