0000811596 2026-10-21 2026-10-21 false 0000811596 KAISER ALUMINUM CORP 8-K 2026-10-21 DE 1-09447 94-3030279 1550 West McEwen Drive Suite 500 Franklin TN 37067 (629) 252-7040 Not Applicable false false false false Common stock, par value $0.01 per share KALU NASDAQ false