The aim of this study is to analyze whether the stock prices decrease at ex-dividend date in Indonesia Stock Exchange (IDX) that is determined by amount of dividend drop-off ratio (DDR). This study also attempts to investigate the differences the stock prices decrease at  ex-dividend date based on  Investment Opportunity Set (IOS).  Sample consist of  the companiesthat announced the dividend during 2010-2012 periods. By using non-parametric tests, especially Chi-square Test and Mann Whitney Test,  the result of this study showed the stock prices decreased less than dividend amount on ex-dividend date.  Besides, the non-growth firms experienced decrease more than growth firms.
                        
                        
                        
                        
                            
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