The purpose of the present study was to find out the return during Ramadan, which is different from returns in other periods in the Indonesia Stock Exchange. We analyzed three months of observations; one month before Ramadan (Sha'ban), Ramadan, and one month after Ramadan. Hypothesis testing using paired sample t-test was used to determine whether there were any differences between Ramadan with Sha'ban and also between Ramadan with Shawwal. The results of this study showed that there is no difference between returns in Ramadan with the returns in other months (one month before Ramadan and one month after Ramadan) in the Indonesia Stock Exchange. So, based on the period of this research, it can be concluded that there is no Ramadan effect in the Indonesia Stock Exchange.

1. Akrami, H., Garkaz, M., & Mehrazin, A. (2012). The effect of Ramadan month on stock abnormal return of the companies accepted in Tehran Stock Exchange. Economics and Finance Review, 2 (5), 45-51.
2. Al-Hajieh, H., Redhead, K., & Rodgers, T. (2011). Investor sentiment and calendar anomaly effects: A case study of the impact of Ramadan on Islamic Middle Eastern markets. Research in International Business and Finance, 25 (3), 345-356. DOI: 10.1016/j.ribaf.2011.03.004
3. Al-Ississ, M. (2010). The impact of religious experience on financial markets (Working Paper). Harvard Kennedy School of Government. Retrieved from <a href=http://www1.aucegypt.edu/faculty/alississ/pdf/The%20Impact%20Of%20Religious%20Experience%20On%20Financial%20Markets,%20Jun%2026%202010.pdf target="_blank">http://www1.aucegypt.edu/faculty/alississ/pdf/The%20Impact%20Of%20Religious%20Experience%20On%20Financial%20Markets,%20Jun%2026%202010.pdf</a>
4. Al-Khazali, O. (2014). Revisiting fast profit investor sentiment and stock returns during Ramadan. International Review of Financial Analysis, 33(C), 158-170. DOI: 10.1016/j.irfa.2014.02.003
5. Alteza, M. (2007). Efek hari perdagangan terhadap return saham: suatu telaah atas anomali pasar efisien [Securities trading day on stock returns: A review of the efficient market anomaly]. Jurnal Ilmu Manajemen, 3 (1), 31-42.
6. Amelita. (2014, August 6). Memanfaatkan peluang perubahan perilaku musiman konsumen. [Utilizing seasonal consumer behavior change opportunities]. Frontier Consulting Group.Retrieved from <a href=http://www.frontier.co.id/memanfaatkan-peluang-perubahan-perilaku-musiman-konsumen.html target="_blank">http://www.frontier.co.id/memanfaatkan-peluang-perubahan-perilaku-musiman-konsumen.html</a>
7. Białkowski, J., Bohl, M. T., Kaufmann, P., & Wisniewski, T. P. (2013). Do mutual fund managers exploit the Ramadan anomaly? Evidence from Turkey. Emerging Markets Review, 15, 211-232. DOI: 10.1016/j.ememar.2013.02.003
8. Białkowski, J., Etebari, A., & Wisniewski, T. P. (2012). Fast profits: Investor sentiment and stock returns during Ramadan. Journal of Banking & Finance, 36 (3), 835-845. DOI: 10.1016/j.jbankfin.2011.09.014
9. Bukhari, S. K. H., Jalil, A., & Rao, N. H. (2011). Detection and forecasting of Islamic calendar effects in time series data: Revisited. SBP Working Paper Series (Paper No. 39). Retrieved from <a href=http://www.sbp.org.pk/repec/sbp/wpaper/wp39.pdf target="_blank">http://www.sbp.org.pk/repec/sbp/wpaper/wp39.pdf</a>
10. Darmadji, T., & Fakhruddin. (2012) Pasar Modal Di Indonesia [Capital market in Indonesia].E disi Ketiga. Jakarta : Salemba Empat.
11. Fitriyani, I., & Maria, M. R. S. (2013). Analisis January Effect Pada Kelompok Saham Indeks LQ-45 di Bursa Efek Indonesia Tahun 2009-2011 [Analysis of January effect in LQ - 45 indexes in the Indonesia Stock Exchange 2009-2011]. E-Jurnal Akuntansi Universitas Udayana, 4(2), 421-438.
12. Gumanti, T. A., & Dan Elok, S. U. (2002). Bentuk pasar efisien dan pengujiannya [The form of the efficient market and its testing]. Jurnal Akuntansi & Keuangan, 4 (1), 54-68.
13. Halari, A. (2013). An analysis of monthly calendar anomalies in the Pakistani Stock Market (Unpublished Thesis). School of Business, University of Dundee, Dundee, Scotland.
14. Husain, F. (1998). Seasonality in the Pakistani equity market: The Ramadan effect. The Pakistan Development Review, 37 (1), 77-81.
15. Jogiyanto, H. (2005). Pasar efisien secara keputusan [Decisionally efficient market]. Jakarta: PT. Gramedia Pustaka Utama.
16. Jogiyanto, H. (2014). Teori portofolio dan analisis investasi [Portfolio theory and investment analysis]. Yogyakarta: BPFE-Yogyakarta.
17. Jones, C. P. (1997). Investments: Analysis and management. New York: John Wiley & Sons, Inc.
18. Mulatsih, L. S., Maskie, G., & Susanto, M. H. (2009). Analisis reaksi pasar modal terhadap pengumuman right issue di Bursa Efek Indonesia (BEJ) (Pengamatan terhadap return, abnormal return, security return variability dan trading volume activity) [Analysis of capital market reaction to the announcement of the rights issue in the Indonesia Stock Exchange]. WACANA, 12 (4), 646-661.
19. PT Kustodian Sentral Efek Indonesia (KSEI). (2013). Berita Pers: AKSes, Untuk Investasi Di Pasar Modal Indonesia Lebih Transparan Dan Nyaman [Press Release: AKSes, Investing in the Indonesia capital market to become more transparent and comfortable]. Retrieved from <a href=http://web.ksei.co.id/_contents/_5/I_Press%20Release/2013/Press%20Release%20Sosialisasi%20fasilitas%20AKSes%20Surabaya%20.pdf target="_blank">http://web.ksei.co.id/_contents/_5/I_Press%20Release/2013/Press%20Release%20Sosialisasi%20fasilitas%20AKSes%20Surabaya%20.pdf</a>
20. PT Kustodian Sentral Efek Indonesia (KSEI). (2015). Berita Pers: Triwulan IV, Kepemilikan Saham Masih Didominasi Investor Asing [Press Release: Fourth quarter stock ownership still dominated by foreign investors]. Retrieved from <a href=http://www.ksei.co.id/files/uploads/press_releases/press_file/id-id/98_siaran_pers_triwulan_iv_kepemilikan_saham_masih_didominasi_investor_asing_20150130193607.pdf target="_blank">http://www.ksei.co.id/files/uploads/press_releases/press_file/id-id/98_siaran_pers_triwulan_iv_kepemilikan_saham_masih_didominasi_investor_asing_20150130193607.pdf</a>
21. Ryaly, V. R., Kumar, R. S. R. K., & Urlankula, B. (2014). A study on weak-form of market efficiency in selected Asian stock markets. Indian Journal of Finance, 8 (11), 34-43. DOI: 10.17010//2014/v8i11/71842
22. Selvarani, M., & Shree, M. L. (2009). Seasonality in National Stock Exchange indices and pharmaceutical industry. Indian Journal of Finance, 3 (3), 17-26. DOI: 10.17010/ijf/2009/v3i3/71628
23. Seyyed, F. J., Abraham, A., & Al-Hajji, M. (2005). Seasonality in stock returns and volatility: The Ramadan effect. Research in International Business and Finance, 19 (3), 374-383. DOI: 10.1016/j.ribaf.2004.12.010
24. Shah, S. M., Rehman, A., & Ahmed, S. N. (2014). The Ramadan effect on stock market. European Academic Research, 1(11), 4712-4720.
25. Sunariyah. (2006). Pengantar Pengetahuan Pasar Modal Edisi Kelima [Introduction to capital market ] . Yogyakarta: UPP STIM YKPN.
26. Syuhud, KH. M. (2011). Dosa Aset Menganggur: Ramadhan Bulan Aktivitas [The sin of idle assets: Ramadan month activities]. Retrieved from <a href=http://koran.bisnis.com/read/20110821/251/44495/dosa-aset-menganggur-ramadhan-bulan-aktivitas-ekonomi target="_blank">http://koran.bisnis.com/read/20110821/251/44495/dosa-aset-menganggur-ramadhan-bulan-aktivitas-ekonomi</a>
27. Tandelilin. (2001). Analisis Investasi dan Manajemen Portofolio Edisi Pertama [Investment analysis and portfolio management]. Yogyakarta: BPFE Yogyakarta.
28. Tim Studi. (2008). Identifikasi Pemodal Asing Di Pasar Modal Indonesia. Laporan Studi diterbitkan [identification of foreign investors in the Indonesian capital market] . Jakarta: Departemen Keuangan Republik Indonesia.