Century Aluminum Company announced that on June 5, 2023, the Company's stockholders voted to increase the size of Century's Board of Directors (the “Board”) from six to seven members, and elected Tamla Olivier to join Century's six incumbent Directors, as an independent director with a term expiring at the Company's annual meeting of stockholders in 2024. Ms. Olivier is Chief Operating Officer for Pepco Holdings, part of the Exelon family of companies, the nation's leading energy company with more than 10 million customers. Ms. Olivier has been working in the energy market for more than a decade with Exelon and oversees the company's electric and natural gas operations in Delaware, and electric operations in the District of Columbia, Maryland and New Jersey.

Prior to her time with Exelon, Ms. Olivier held senior leadership roles at T. Rowe Price, United Defense and Wells Fargo. The Company also announced the retirement of Shelly Harrison, Senior Vice President, Finance and Treasurer. Pete Trpkovski, Vice President, Finance and Investor Relations will assume Ms. Harrison's duties and has been promoted to Senior Vice President, Finance and Treasurer, effective July 1, 2023.

Ms. Harrison announced her retirement from Century after more than 23 years with the Company and will remain in her role through June 30, 2023. Mr. Trpkovski joined Century in 2013, holding several positions of increasing responsibility within the finance function since that time. From 2019-2022, Mr. Trpkovski served as Director of Financial Planning and Analysis and in 2022 Mr. Trpkovski was promoted to Vice President, Finance and Investor Relations.

Prior to joining Century, Mr. Trpkovski held multiple roles with Johnson Controls and Citigroup.