Share price reactions to tariff imposition announcements during the first Trump administration Wengerek, Sascha Tobias Uhde, André Hippert, Benjamin Geopolitical risk Protectionism Strategic trade policy Tariffs Trade conflict U.S. – China trade war This study analyzes the impact of tariff imposition announcements on the stock prices of 1,194 U.S. companies during the first Trump administration, using a unique sample of 4,624 announcements made by or against the U.S. between January 2018 and August 2019. We find that tariff announcements lead to negative (cumulative) average abnormal stock returns. These negative wealth effects occur regardless of whether the Trump administration imposes safeguard tariffs to protect domestic industries or foreign countries announce retaliatory tariffs. Moreover, the adverse impact is primarily driven by announcements involving China, with variations linked to sector-specific, tariff, trade, and firm characteristics. Elsevier BV 2025 info:eu-repo/semantics/article doc-type:article text http://purl.org/coar/resource_type/c_6501 https://ris.uni-paderborn.de/record/59673 Wengerek ST, Uhde A, Hippert B. Share price reactions to tariff imposition announcements during the first Trump administration. <i>Finance Research Letters</i>. 2025;80. doi:<a href="https://doi.org/10.1016/j.frl.2025.107381">10.1016/j.frl.2025.107381</a> eng info:eu-repo/semantics/altIdentifier/doi/10.1016/j.frl.2025.107381 info:eu-repo/semantics/altIdentifier/issn/1544-6123 info:eu-repo/semantics/openAccess