“…Following past literature such as Vermaelen (1984), Nohel andTarhan (1998), McNally (1999), Ikenberry et al (1995Ikenberry et al ( , 2000, Maxwell and Stephens (2003), Hatakeda and Isagawa (2004), Howell and Payne (2004), Jung et al (2005), Liao et al (2005), Massa et al (2007), and Firth et al (2010), we include firm size (Size), 5 book-to-market ratio (BTM), 6 stock return volatility (StdRtn), 7 leverage ratio (Leverage), 8 binary variable for technique sector (Tech), 9 insider ownership (Insider), 10 cumulative abnormal returns prior to the announcement (CAR20B), 11 and return of assets (ROA) 12 as control variables emphasized by the aforementioned studies. The data used here to calculate control variables are adopted; Table A1 shows a detailed description of the construction of all variables used in this study.…”