THE EFFECT OF FIRM-SPECIFIC NEWS TO STOCK PERFORMANCE: CASE OF BIST-30 COMPANIES
ABSTRACTThe purpose of this study is to analyze whether the news provides an opportunity to obtain abnormal returns, which news are announced by companies traded in BIST-30 during January 2003 to December 2012. The firm-specific news are classified on 5 main topics which are corporate governance related announcements, financial announcements, legal announcements, operational announcements and restructuring related announcements. The data covers 2143 news announced by BIST-30 companies. For data analysis event study is used. As a result, it is determined investors mostly react to announcements about operational, financial and restructuring news in terms of the average abnormal returns (ARR) at the day of event respectively. Result shows that Borsa Istanbul is not effective at semi-strongly form within the scope of efficient market hypothesis.