Form 3 Filing for Jennifer Kristi Preston

This filing details Jennifer Kristi Preston's ownership of KAISER ALUMINUM CORP (KALU) common stock. As an Executive Vice President of Human Resources & Labor, Preston directly owns 5,604 shares following the acquisition of restricted stock units. The filing also includes a Power of Attorney document, appointing John M. Donnan and Cherrie I. Tsai to act on Preston's behalf for executing and filing SEC forms related to securities transactions. This Power of Attorney remains effective until Preston is no longer required to file such forms.