Securities Law Prof Blog

Editor: Eric C. Chaffee
Univ. of Toledo College of Law

Sunday, July 13, 2008

Sen on 10b5-1 Plans

Are Insider Sales Under 10b5-1 Plans Strategically Timed?, by RIK SEN, New York University, was recently posted on SSRN.  Here is the abstract:

Previous research and numerous media articles suggest that sales executed under 10b5-1 trading plans are strategically timed. However, we find no significant difference in stock price performance following plan sales and non-plan sales. We demonstrate that price contingent orders (e.g. limit orders), a common feature in trading plans, give rise to empirical patterns that have been taken as evidence of strategic timing of sales. Event study methods employed in previous research on plan sales are shown to give biased estimates of post-event abnormal returns when the events are not exogenous to past returns.

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