Recent SEC prosecution and insider trading on forthcoming merger announcements

While trading on nonpublic information is illegal, the enforcement of this law has been elusive, particularly in the area of trading in advance of merger announcements. We examine the impact of insider trading on daily stock price changes for firms identified by the SEC in the Antoniu-Newman insider trading case. Using residual analysis, the abnormal returns occuring prior to the announcement are calculated and compared with a sample of 188 typical merger candidates not identified in the Antoniu-Newman case to determine whether or not there was an unusually large market reaction prior to the forthcoming merger announcement on the subset of merger candidates involved in the court procedure.