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Journal : INVEST : Jurnal Inovasi Bisnis dan Akuntansi

Analysis of the Indonesian Capital Market Reaction to Stock Exchange Regulations as an Impact of the United States Reciprocal Tariff Policy: An Event Study of LQ45 Stocks Wiguna, Dewa Made Kramas Artha; Yuniarta, Gede Adi; Devi, Sunitha
INVEST : Jurnal Inovasi Bisnis dan Akuntansi Vol. 6 No. 2 (2025): INVEST : Jurnal Inovasi Bisnis dan Akuntansi
Publisher : Lembaga Riset dan Inovasi Al-Matani

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55583/invest.v6i2.1596

Abstract

This study aims to analyze the reaction of the Indonesian capital market to the regulations issued by the Indonesia Stock Exchange (IDX) and the Financial Services Authority (OJK) in response to the reciprocal tariff policy imposed by the United States on April 2, 2025. The policy created significant shocks in the capital market, marked by a sharp decline in the LQ45 index and foreign investors’ net selling, which triggered the implementation of emergency measures such as adjustments to the lower auto rejection limit and trading halt mechanisms. This research employs a quantitative approach using the event study method on 45 companies listed in the LQ45 index over an 11-day event window (H-5 to H+5). The analysis was conducted by measuring Average Abnormal Return (AAR), Cumulative Abnormal Return (CAR), and Average Trading Volume Activity (ATVA), tested with the Wilcoxon Signed Rank Test since the data were not normally distributed. The results indicate significant differences in AAR and CAR before and after the event, suggesting that the IDX and OJK regulations contained relevant information affecting stock prices. However, no significant difference was found in ATVA, implying that market reactions were more price-driven than volume-driven. These findings support the Signaling Theory and the semi-strong form of the Efficient Market Hypothesis, showing that the Indonesian capital market is responsive to new information provided by regulators.
Co-Authors Aditya Putra, I Putu Wahyu Alit, Ngurah Anak Agung Gde Putu Widanaputra Anan, Made Wimantara Budiarta, Luh Gede Rahayu Budiasih, I Gusti Nyoman Desak Putu Erna Juliarmini Dewa Nyoman Badera Dewi, Gusti Ayu Ketut Rencana Sari Dewi, Luh Gede Kusuma Dewi, Ni Luh Manik Asih Arta Dewi, Putu Eka Dianita Marvilianti Egi Prayana Febriyanti, Ni Luh Meilina Gede Adi Yuniarta Gusti Ayu Tunince Arianti I Gd Nandra Hary Wiguna, I Gd Nandra Hary I Gede Arya Wigarba I Gede Hestha Mahan Dana I Gusti Ayu Nyoman Budiasih I Gusti Putu Geria Warsita Widya Darma I Ketut Yadnyana I Nyoman Dedi Setiadi I Nyoman Putra Yasa I Putu Hendra Martadinata . I Putu Wahyu Aditya Putra Ida Ayu Putu, Cintya Paramitha Kadek Heni Yuliana Sari Kadek Sinta Dewi Kadek Yudi Wiguna Komang Adi Kurniawan Saputra leny sukmayanti Lucy Sri Musmini Luh Gede Kusuma Dewi Luh Gede Rahayu Budiarta Made Riki Ponga Kusyanda Mahendra, Kadek Yogi Dwi Martin Mahardika, A.A.N. Yudha Merliana Dewi Ngurah Alit Ni Komang Sri Purnami Ni Luh Asri Savitri Ni Luh Budiari Ni Luh Gede Erni Sulindawati Ni Luh Gede Yastini Ni Luh Indrawati Ni Made Dwi Ratnadi Ni Made Sindy Warasniasih Ni Putu Noviyantini Noviyantini, Ni Putu Nyoman Suadnyana Pasek, Nyoman Suadnyana Nyoman Trisna Herawati Pratama, Putu Adi Pratama, Putu Bayu Prayana, Egi Priandani, Ni Made Yanti Putra, I Gusti Made Priyambhada Putra, Putu Cipta Perdana Putu Adi Pratama Putu Bayu Pratama Putu Cipta Perdana Putra Putu Febriyanti Putu Riesty Masdiantini Putu Riesty Masdiantini, Putu Riesty Romi Ananda Putra Sekarrini, Ni Luh Setiadi, I Nyoman Dedi sukmayanti, leny Suryani, Kadek Ria Warasniasih, Ni Made Sindy Wiguna, Dewa Made Kramas Artha Windayani, Sang Putu