Management Change/Compensation Form 8 K

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On December 9, 2024, Rob Hoffman was promoted to the role of Senior Vice President, Chief Information Officer and Chief Accounting Officer of Century Aluminum Company (the "Company"). Mr. Hoffman, age 55, joined the Company in October 2004 and served as the Company's Director of Financial Planning and Analysis from May 2015 through May 2017. Mr. Hoffman was promoted to the role of Chief Information Officer in June 2017 and was promoted again to Vice President, Chief Accounting Officer and Chief Information Officer in 2021. Mr. Hoffman holds a Bachelor of Science degree in Accounting from Golden Gate University, a Master of Business in Finance from Saint Mary's College of California and is a Certified Public Accountant.

In connection with his promotion, Century's Board of Directors appointed Mr. Hoffman as the Company's principal accounting officer. Mr. Hoffman assumes the duties of principal accounting officer following the departure of the Company's former principal accounting officer, Ms. Theresa Brainerd, effective December 5, 2024.

There is no arrangement or understanding between Mr. Hoffman and any other person relating to the designation of Mr. Hoffman as the principal accounting officer of the Company. With respect to the disclosure required by Item 401(d) of Regulation S-K, there are no family relationships between Mr. Hoffman and any of the Company's directors or executive officers. With respect to Item 404(a) of Regulation S-K, there are no relationships or related transactions between Mr. Hoffman and the Company that would be required to be reported.