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Comparative Analysis of Stock Prices, Abnormal Returns, and Trading Volume Activity in the Metals and Minerals Industry Before and After the 2025 United States Import Tariff Policy = Comparative Analysis of Stock Prices, Abnormal Returns, and Trading Volume Activity in the Metals and Minerals Industry Before and After the 2025 United States Import Tariff Policy
Titania Aisyah Karuniawati, “Comparative Analysis of Stock Prices, Abnormal Return, and Trading Volume Activity in the Metals and Minerals Industry Before and After the 2025 United States Import Tariff Policy”. D-IV Thesis Financial Analyst Accounting Department, Politeknik Negeri Semarang, under the guidance of Edi Wijayanto, S.E., M.Si., and Dra. Nurul Hamida, M.Pd. July 2026, 68 pages.
This study analyses the impact of the 2025 US import tariff policy on share prices, abnormal returns, and trading volume activity in the metals and minerals sector. The aim is to identify whether there are significant differences before and after the 2025 US import tariff policy. The method used is an event study, in which data are analyzed quantitatively using statistical tests such as the Shapiro-Wilk test to assess data normality, as well as the Paired Sample T-Test and the Wilcoxon Signed Ranks Test to test for differences in means. The results of the study indicate that (1) there is no significant difference in share prices for metal and mineral industry shares before and after the 2025 US import tariff policy; (2) there is a significant difference in abnormal returns for metal and mineral industry shares before and after the 2025 US import tariff policy; (3) there was a significant difference in trading volume activity for shares in the metals and minerals industry before and after the 2025 US import tariff policy.
Keywords: Share Prices, Abnormal Returns, Trading Volume Activity, US Import Tariff Policy, Metals and Minerals Industry, Market Efficiency Theory
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