Shares of nuclear power companies closed higher on Friday after U.S. President Donald Trump signed executive orders seeking to jumpstart the industry.

Constellation Energy, the largest nuclear operator in the U.S., rose by 3% by Friday afternoon, while shares of uranium mining firms Uranium Energy (23%), Energy Fuels (17%), Cameco Corp. (9.5%) and Centrus Energy (22%) also spiked in value.

Constellation Energy, the largest nuclear operator in the U.S., gained 2%. Cameco Corp., one of the biggest uranium miners in the world, rose around 11%.Trump said the orders focus on small advanced reactors that are viewed by many in the industry as the future.

Now they have a trade war problem to worry about again. Stocks and the dollar fell Friday after President Donald Trump brought the trade war back to the forefront with threats of massive tariffs against one of America’s most valuable companies and one of its most important trading partners.

President Donald Trump’s moves Friday to reignite his global trade war laid bare the administration’s bubbling frustration with resistance from both corporations and foreign countries unwilling to rapidly bow to U.

U.S. President Donald Trump's tariff decisions since he took office on January 20 have shocked financial markets and sent a wave of uncertainty through the global economy. Here is a timeline of the major developments: February 1 - Trump imposes 25% tariffs on Mexican and most Canadian imports and 10% on goods from China,