Century Aluminum's stock fell 5.29% in pre-market trading, extending losses from the previous session.

The decline appears to be driven by investor concerns over potential changes to U.S. trade policies affecting the aluminum industry. Reports indicate that the Trump administration is preparing to reshape its steel and aluminum tariff regime, with plans to set a 25% tariff on finished products containing aluminum. This change could effectively raise costs for many aluminum-containing imports, potentially reducing demand for the metal and negatively impacting producers like Century Aluminum.

Market participants are worried that higher costs for finished aluminum products could dampen aluminum consumption, creating headwinds for the company's performance.