Shares of South Korean steelmaking companies fell following President Donald Trump’s announcement of a 25% tariff on all US imports of steel and aluminum. Notable companies such as Dongkuk Steel Mill and Hyundai Steel faced declines between 1% and 3%. With South Korea being the fourth-largest steel exporter to the U.S., the tariffs could significantly affect market dynamics. Investors are anticipating how these tariffs will impact both domestic and international steel demand as trade relations evolve.