Abstract:
This study analyzes the shareholders’ responses at the announcement of the changes in non-executive
directors of the companies listed on the CSE thereby provides a test of the semi-strong form efficient
market hypothesis of Sri Lankan Share Market by using event study mythology. The sample consists of
80 listed companies, which made 108 of public announcements of the changes in the non-executive
director on the CSE from 2012-2016. The Market Model along with proxy of the CSE All Share Price
Index (ASPI) were used in this study in generating abnormal returns surrounding subsequent each
announcement. Specifically, the Market model was used by incorporating cluster volatility effect and
information asymmetric effects to get a strong conclusion. Overall results of shareholders’ responses to
the changes in non-executive directors' announcements based on market model along with the proxy of
CSE all-share price index show the positive reaction for information subsequent to the changes in nonexecutive directors' announcements in CSE. The abnormal returns appear on a prior to the actual
announcement of the information, as well as after the actual announcement of the information. It
confirms that the shareholders respond positive before and after the actual announcement of the
information. In addition, these results confirm that the Sri Lankan Share market is inconsistent with
semi-strong form market efficient hypothesis. These findings will be important to all parties interested
in the share market. Especially, it is more important to the investors, the managers of the companies
and the stock exchange regulatory agencies in their decision-making process.
