144 0001551869 XXXXXXXX LIVE 0000811596 Kaiser Aluminum Corporation 001-09447 1550 West McEwen Drive Suite 500 Franklin TN 37067 629-252-7162 Keith Harvey CEO Common Merrill 39001 W 12 Mile Rd Farmington Hills MI 48331 50032 8755600 16340606 04/27/2026 NASDAQ Common 07/27/2022 Compensation Kaiser Aluminum N 10082 07/27/2022 N/A Common 03/05/2024 Compensation Kaiser Aluminum N 5604 03/05/2024 N/A Common 03/05/2025 Compensation Kaiser Aluminum N 7809 03/05/2025 N/A Common 03/05/2025 Compensation Kaiser Aluminum N 7537 03/05/2025 N/A Common 03/05/2026 Compensation Kaiser Aluminum N 19000 03/05/2026 N/A Y 04/27/2026 Jacob Aymen