This research aimed to know the impact of flood in Jakarta and Haiyan Typhoon in
Philippines towards each stock market in two countries in 2013. By using phenomenon which is
happened, event study will be conducted to know the significant impact on its Average
Abnormal Return on each country. In order to know the result, it will used by calculating
Abnormal Return which is get from the Return of companies’ stock return on daily basis in the
event period of different country. The result will be tested by using paired sample t-test, to know
which is the before and after event in Indonesia and Philippines have significant impact or not in
the its abnormal return. The findings of this research, there is no significant different average
abnormal return between before event day and after event day of both natural disaster events in
Indonesia and Philippines.