X0508 4 2025-03-05 0000811596 KAISER ALUMINUM CORP KALU 0001330319 West Neal E 1550 WEST MCEWEN DRIVE SUITE 500 FRANKLIN TN 37067 false true false false EVP & CFO false Common Stock, par value $0.01 per share 2025-03-05 4 A false 7150 0 A 22413 D Common Stock, par value $0.01 per share 2025-03-05 4 A false 2299 0 A 24712 D Common Stock, par value $0.01 per share 2025-03-05 4 F false 611 69 D 24101 D Common Stock, par value $0.01 per share 2025-03-05 4 F false 892 69 D 23209 D Common Stock, par value $0.01 per share 13026 I By West Family Trust Grant to the reporting person effective as of March 5, 2025 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on March 5, 2028 or earlier upon the occurrence of certain specified circumstances. Includes 22,413 shares acquired pursuant to grants of restricted stock units. Shares earned upon the vesting on March 5, 2025 of certain performance shares granted to the reporting person in 2022 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2025, the Registrant's compensation committee certified the performance shares payout multiplier based on the level of achievement by the Registrant of certain pre-established performance goals for 2022 through 2024. Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2025 of the above-referenced performance shares. Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2025 of certain restricted stock units granted to the reporting person in 2022 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. Includes 18,960 shares acquired pursuant to grants of restricted stock units. /s/ Cherrie I. Tsai, with power of attorney for Neal E. West 2025-03-07