X0407 4 2023-06-07 0 0000811596 KAISER ALUMINUM CORP KALU 0001978222 Narayan Vijai 1550 WEST MCEWEN DRIVE SUITE 500 FRANKLIN TN 37067 0 1 0 0 VP and CAO 0 Common Stock, par value $0.01 per share 2023-06-07 4 A 0 396 0.00 A 3496 D Grant to the reporting person effective as of June 7, 2023 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. All restrictions will lapse on March 5, 2026. Includes 3,100 shares acquired pursuant to grants of restricted stock units. /s/ Cherrie I. Tsai, with power of attorney for Vijai Narayan 2023-06-09