Indonesian Stock Market Reaction to the Escalation of the 2026 Iran Conflict: Evidence from an Event Study of Energy Sector Firms
DOI:
10.47353/ecbis.v4i5.409Published:
2026-05-28Downloads
Abstract
This study examines the reaction of the Indonesian capital market to the escalation of the Iran conflict in 2026 using an event study approach focusing on energy sector firms listed on the Indonesia Stock Exchange. Market reactions are measured using Average Abnormal Return (AAR) and Trading Volume Activity (TVA). The observation period includes an 11-day event window (t−5 to t+5) and a 100-day estimation period. Statistical tests employed include the Shapiro–Wilk normality test, one-sample t-test, paired sample t-test, and Wilcoxon Signed Rank Test.
The findings indicate that abnormal returns are only significant around the event date but do not differ significantly between pre- and post-event periods. In contrast, trading volume activity shows consistent and significant changes. These results suggest that geopolitical conflict information is more strongly reflected in trading behavior than in price adjustments. This study contributes to the literature by providing sector-specific evidence from an emerging market and highlighting behavioral market responses.
Keywords:
event study abnormal return trading volume activity geopolitical risk energy sectorReferences
Alsagr, N., Yudaruddi̇n, R., Ekşi̇, İ. H., & Hacıevliyagil, N. (2026). Geopolitical Conflict, Military Capability, and Energy Market Stability: Evidence From The Israel–Hamas Conflict. Energy Policy, 215(April). https://doi.org/10.1016/j.enpol.2026.115333
Antonakakis, N., Chatziantoniou, I., & Filis, G. (2017). Oil Shocks and Stock Markets: Dynamic Connectedness Under The Prism Of Recent Geopolitical And Economic Unrest. International Review of Financial Analysis, 50, 1–26. https://doi.org/10.1016/j.irfa.2017.01.004
Anwer, Z., & Ahmad, F. (2025). Does Geopolitical Risk Matter for Asean5 Economies? Evidence on Conventional and Islamic Compliant Indices. Journal of Islamic Monetary Economics and Finance, 11(2), 307–330. https://doi.org/10.21098/jimf.v11i2.2469
Assaf, R., Gupta, D., & Kumar, R. (2023). The Price of War: Effect of The Russia-Ukraine War on The Global Financial Market. Journal of Economic Asymmetries, 28(April), e00328. https://doi.org/10.1016/j.jeca.2023.e00328
Augustin, P., & Subrahmanyam, M. G. (2020). Informed Options Trading Before Corporate Events. Annual Review of Financial Economics, 12, 327–355. https://doi.org/10.1146/annurev-financial-012820-033052
Bajzik, J. (2021). Trading Volume and Stock Returns: A Meta-Analysis. International Review of Financial Analysis, 78(October), 101923. https://doi.org/10.1016/j.irfa.2021.101923
Biswas, P., Jain, P., & Maitra, D. (2024). Are Shocks in The Stock Markets Driven By Commodity Markets? Evidence From Russia-Ukraine War. Journal of Commodity Markets, 34(May 2023), 100387. https://doi.org/10.1016/j.jcomm.2024.100387
Böyükaslan, A., Demirer, R., Ergüney, E. B., & Gursoy, S. (2024). Geopolitical Risks and The Energy-Stock Market Nexus: Evidence from Turkiye. Borsa Istanbul Review, 24(1), 73–83. https://doi.org/10.1016/j.bir.2023.10.012
Caldara, D., & Iacoviell, M. (2022). Measuring Geopolitical Risk. In American Economic Review (Vol. 112, Number 4). https://doi.org/10.1257/aer.20191823
Chiaramonte, L., Mecchia, F., Paltrinieri, A., & Sclip, A. (2025). Geopolitical Risk and Energy Markets: Past, Present, and Future. Journal of Economic Surveys, 39(5), 2233–2253. https://doi.org/10.1111/joes.12697
Chowdhury, M. A. F., Kabir Hassan, M., Abdullah, M., & Hossain, M. M. (2025). Geopolitical Risk Transmission Dynamics to Commodity, Stock, and Energy Markets. Quantitative Finance and Economics, 9(1), 76–99. https://doi.org/10.3934/QFE.2025003
Cookson, J. A., & Niessner, M. (2020). Why Don’t We Agree? Evidence from a Social Network of Investors. Journal of Finance, 75(1), 173–228. https://doi.org/10.1111/jofi.12852
Fama, E. F. (1970). Efficient Capital Markets: A Review of Theory and Empirical Work. The Journal of Finance, 25(2), 383–417. https://doi.org/10.1111/j.1540-6261.1970.tb00518.x
Fitriyah, F., & Mukminatin, Z. N. (2025). Return Connectedness of Sectoral Stock Indices on The Indonesian Stock Exchange During Russian-Ukraine Conflict. Journal of Accounting and Investment, 26(1), 155–172. https://doi.org/10.18196/jai.v26i1.22406
Geman, B. (2026, May 22). Oil tops $100 per barrel as Iran war escalates. Axios. https://www.axios.com/2026/03/08/iran-war-oil-market-barrel-cost
He, Z. (2023). Geopolitical Risks and Investor Sentiment: Causality and TVP-VAR Analysis. North American Journal of Economics and Finance, 67(May), 101947. https://doi.org/10.1016/j.najef.2023.101947
Karpoff, J. M. (1987). The Relation Between Price Changes and Trading Volume: A Survey. Journal of Financial and Quantitative Analysis, 22(1), 109–126. https://doi.org/10.2307/2330874
Lamine, A., & Zribi, S. (2024). Do Geopolitical Risks Affect Stock Market Returns and Volatilities: an Analysis Based on The TVP-VAR Model. European Journal of Government and Economics, 13(2), 240–261. https://doi.org/10.17979/ejge.2024.13.2.10168
Le, T. D. Q., Nguyen, D. T., Ho, T. H., & Ngo, T. (2024). Government Intervention and Stock Price Returns During Covid-19 Pandemic: Evidence From An Emerging Market. Cogent Business and Management, 11(1). https://doi.org/10.1080/23311975.2024.2376042
MacKinley, C. A. (1997). Event Study Methology. In Journal of Ecnonomic Literature (Vol. 35, pp. 13–39).
Putra, D. A., Fitralisma, G., & Fata, M. A. (2024). Jurnal Riset Manajemen, Bisnis, Akuntansi dan Ekonomi. Jurnal Riset Manajemen, Bisnis, Akuntansi Dan Ekonomi, 2(1), 14–15.
Ratuela, H. S. P., Saerang, I. S., Rumokoy, L. J., & Ratulangi, U. S. (2025). Keywords: Abnormal Return, Trading Volume. Jurnal Ilmiah Manajemen Bisnis dan Inovasi Universitas Sam Ratulangi (JMBI UNSRAT), 12(2), 681–693.
Sari, M. M., Dewi, S. N., Sari, A., & Janiman, J. (2024). The Impact of Russia’s Invasion of Ukraine On Capital Market Reaction In Energy Sector Companies Listed On The Idx. Journal of Social Science (JoSS), 3(1), 1144–1153. https://doi.org/10.57185/joss.v3i1.253
Siganos, A., Synapis, A., & Tsalavoutas, I. (2024). Information Leakage Prior To Market Switches and The Importance Of Nominated Advisers. British Accounting Review, 56(6), 101461. https://doi.org/10.1016/j.bar.2024.101461
Smales, L. A. (2021). Geopolitical Risk and Volatility Spillovers in Oil And Stock Markets. Quarterly Review of Economics and Finance, 80, 358–366. https://doi.org/10.1016/j.qref.2021.03.008
Toe, D. L. tan, & Ouedraogo, S. (2022). Dynamic Relationship Between Trading Volume, Returns and Returns Volatility: An Empirical Investigation on The Main African’s Stock Markets. Journal of Asset Management, 23(5), 429–444. https://doi.org/10.1057/s41260-022-00274-0
Trade, M. (2026, May 22). IHSG Melemah Akibat Konflik AS-Iran: Strategi Investasi Saham 2026. Maybank Trade. https://www.maybanktrade.co.id/berita/ihsg-melemah-akibat-konflik-as-iran-strategi-investasi-saham-2026/
Tri Wahyudi, S., & Rahmawati, A. (2025). Examining The Link Between World Oil Price Volatility and Sectoral Stock Performance In Indonesia. Cogent Economics and Finance, 13(1). https://doi.org/10.1080/23322039.2025.2535484
Widoretno, A. A., & Fitriyah, N. N. A. (2024). Event Study: The Impact of The Russia-Ukraine Invasion On Stock Prices And Abnormal Returns. Jurnal Akuntansi Bisnis, 17(1), 39. https://doi.org/10.30813/jab.v17i1.4584
Zaremba, A., Cakici, N., Demir, E., & Long, H. (2022). When Bad News Is Good News: Geopolitical Risk and The Cross-Section Of Emerging Market Stock Returns. Journal of Financial Stability, 58(December 2021), 100964. https://doi.org/10.1016/j.jfs.2021.100964
Zaza, A. M. S. U., Banoet, R. Y., & Dima, E. T. Y. (2025). Dampak Ketengangan Geopolitik terhadap Investasi Asing Langsung (FDI) di Indonesia. Scientific Journal of Reflection : Economic, Accounting, Management and Business, 8(3), 949–958. https://doi.org/10.37481/sjr.v8i3.1175
Zhang, B., Liu, Z., Wang, Z., & Zhang, S. (2023). The Impact of Geopolitical Risk On Energy Security: Evidence from a GMM panel VAR approach. Resources Policy, 86(PB), 104222. https://doi.org/10.1016/j.resourpol.2023.104222
Zhang, C., Liu, X., Li, X., & Tang, C. (2023). GJR-GARCH-MIDAS Model Based Analyse Geopolitical Risk and Energy Price Volatility. SSRN Electronic Journal. https://doi.org/10.2139/ssrn.4326097
Zhang, Y., He, J., He, M., & Li, S. (2023). Geopolitical Risk and Stock Market Volatility: A Global Perspective. Finance Research Letters, 53(December 2022), 103620. https://doi.org/10.1016/j.frl.2022.103620
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