Nucor shares are trading lower after after President Trump said in a social media post that the U.S. and Canada reached an agreement to delay 50% import tariffs on Canadian goods for three days, which may lead to competition from Canadian steel. The stock has gained almost 150% since the April 2025 Liberation Day tariffs.

Nucor shares are down due to renewed competition fears from Canadian steel, following a temporary tariff delay agreement. This development reverses some of the gains Nucor experienced under previous tariff protections, highlighting the sensitivity of steel producers to trade policy.

The headline indicates a significant shift in trade policy regarding steel imports from Canada, directly impacting domestic steel producers like Nucor. The temporary delay of tariffs suggests a potential for their full removal or further delays, increasing competition and putting downward pressure on steel prices. This development poses a key risk to the steel sector, which has benefited from protectionist measures. Traders should monitor further announcements regarding trade agreements and their implications for steel demand and pricing.