Disposition and Prospect Theory: Evidence from Insider Trading
21 Pages Posted: 22 Jun 2016
Date Written: November 11, 2015
While most researchers agree on the existence of disposition, there still remains question regarding its cause. In this study, I investigate whether prospect theory is a potential cause by observing levels of disposition among insiders relative to information and risk. I find that while disposition increases for more volatile stocks, the increase is due strictly to an increase in the proportion of gains realized, and not in the decrease of the proportion of losses realized as well. This finding is inconsistent with the disjoint utility curve described by prospect theory, which implies risk seeking preferences for losses. Furthermore, I find that disposition doesn't decrease with superior information, a finding also inconsistent with prospect theory. Lastly, I find that disposition does decrease with financial sophistication, and that the belief in mean reversion does appear to contribute to the disposition effect, but not fully explain it.
Keywords: insider trading, disposition, prospect theory
JEL Classification: G14
Suggested Citation: Suggested Citation