While it is well known that insider trading transfers wealth from uninformed market participants to informed insiders, it is not obvious whether insider trading bring welfare effect. This paper explores an answer to this issue, employing stock trading data around SEO in Japan. An announcement of...

We examine the nature of information contained in insider trades prior to corporate events. Insiders' net buying increases before open market share repurchase announcements and decreases before seasoned equity offers. Higher insider net buying is associated with better post-event operating...