144 0001330319 XXXXXXXX LIVE 0000811596 KAISER ALUMINUM CORP 001-09447 1550 W. MCEWEN DRIVE, SUITE 500 FRANKLIN TN 37067 6292527040 West Neal E Officer Common Wells Fargo Clearing Services

1 N. Jefferson Ave. St. Louis MO 63103

5000 866277.85 16340606 04/28/2026 Nasdaq Common 03/05/2024 Compensation Issuer N 5000 03/05/2024 N/A N West Family Trust

1550 W. MCEWEN DRIVE SUITE 500 FRANKLIN TN 37067

Common Shares of KALU 02/23/2026 5000 608616.63 Shares sold today by the West Family Trust. Neal West is a TTEE of the trust and an officer of the issuer. 04/28/2026 Neal E. West