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Abstrak :
This paper investor reaction to the good news and bad news earnings announcements around earning announcements dates. The result show that investor react positively and significantly to the good news and bad news earnings announcements of 1998 and 1999 at the announcement dates, but respond negatively and significantly to the good news and bad news earnings announcements of year 2000. Statistically there is no significant difference in investor reaction to the good news and bad news earnings announcements for three years. However the study finds two market anomalies. Firstly investors respond positively and significantly to the bad news earnings announcement of year 1998 and 1999 as well as respond negatively to the good news earnings announcement of year 2000. Secondly the magnitude of CAAR values of the bad news earnings announcement is greater that CAAR values of the good news earnings announcements. These evidence are contrary with the efficient market theory (efficient market hypothesis-EMH)

Abstrak :
Pengujian empiris teori pasar efisien (EMH) terus dilakukan oleh banyak peneliti baik yang hasilnya memperkuat maupun yang memperlemah teori tersebut. Salah satu penelitian yang memperlemah teori EMH adalah studi anomali, seperti Ramadan effect. Studi anomali sendiri dibantah oleh penelitian terbaru yang menemukan bukti adanya pelemahan bahkan menghilangnya efek anomali. Penelitian ini mencoba menguji persistensi Ramadan effect pada stock return di 10 negara Muslim. Penulis menemukan bahwa Ramadan effect memang hadir tetapi tidak bersifat persisten. Hal ini konsisten dengan temuan pada uji bentuk pasar efisien, dimana ditemukan bahwa semua pasar di 10 negara Muslim tidak efisien. Ketika dimasukkan faktor krisis, Ramadan effect tetap tidak hadir secara persisten. ...... Empirical testing of Efficient Market Hypothesis (EMH) theory continues to be done by many researchers which the results strengthen or weakened the theory. One that weaken the EMH theory is the study of anomalies, such as the Ramadan effect. Study of anomalies itself is disputed by a new research that found evidence of weakening and even disappearance of the anomalous effect. This study attempts to examine the persistence of Ramadan effect on stock return in 10 Muslim-majority countries. We find the Ramadan effect is present but is not persistent. This is consistent with the findings of the test of efficient market form, where it was found that market in all 10 countries is not efficient. While the crisis factors is also excluded, the Ramadan effect remains not persistently present.