KALU · Kaiser Aluminum Corp

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the Board of Directors of Kaiser Aluminum Corporation and chair or a member of one or more committees of the Board of Directors.

Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the Board of Directors of Kaiser Aluminum Corporation and chair or a member of one or more committees of the Board of Directors.

Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the Board of Directors of Kaiser Aluminum Corporation and chair or a member of one or more committees of the Board of Directors.

Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on June 4, 2027.

Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the Board of Directors of Kaiser Aluminum Corporation and chair or a member of one or more committees of the Board of Directors.

Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the 20 trading days prior to June 4, 2026.

Represents the sale of 1,524 shares in multiple transactions, ranging from $171.25 to $171.74 per share, resulting in a weighed average sale price of $.171.52 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

Represents the sale of 3,031 shares in multiple transactions, ranging from $173.00 to $173.80 per share, resulting in a weighted average sale price of $173.13 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

Includes 72,565 shares acquired pursuant to grants of restricted stock units.

Bona fide gift by the reporting person to a charitable trust for no consideration.

Includes 17,422 shares acquired pursuant to grants of restricted stock units.

Represents the sale of 47,001 shares in multiple transactions, ranging from $175.00 to $175.87 per share, resulting in a weighted average sale price of $175.09 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

Includes 72,565 shares acquired pursuant to grants of restricted stock units.

Represents the sale of 15,000 shares in multiple transactions, ranging from $173.60 to $175.23 per share, resulting in a weighed average sale price of $.174.44 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

Represents the sale of 2,743 shares in multiple transactions, ranging from $175.96 to $179.41 per share, resulting in a weighted average sale price of $178.20 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

Includes 17,422 shares acquired pursuant to grants of restricted stock units.

Includes 3,918 shares acquired pursuant to grants of restricted stock units.

Grant to the reporting person effective as of March 5, 2026 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, 2029 or earlier uponthe occurrence of certain specified circumstances.

Includes 22,865 shares acquired pursuant to grants of restricted stock units.

Grant to the reporting person effective as of March 5, 2026 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, 2029 or earlier uponthe occurrence of certain specified circumstances.

Includes 89,994 shares acquired pursuant to grants of restricted stock units.

Grant to the reporting person effective as of March 5, 2026 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, 2029 or earlier uponthe occurrence of certain specified circumstances.

Includes 4,660 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of certain restricted stock units granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.

Includes 72,565 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of certain restricted stock units granted to the reporting person on March 5, 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.

Includes 7,088 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of the above-referenced performance shares.

Includes 21,661 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of certain restricted stock units granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.

Includes 18,390 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of certain restricted stock units granted to the reporting person in 2025 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.

Includes 3,918 shares acquired pursuant to grants of restricted stock units.

Grant to the reporting person effective as of March 5, 2026 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, 2029 or earlier uponthe occurrence of certain specified circumstances.

Includes 7,088 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of the above-referenced performance shares.

Includes 89,994 shares acquired pursuant to grants of restricted stock units.

Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, 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 2023 through 2025.

Includes 21,661 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of the above-referenced performance shares.

Includes 22,865 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of certain restricted stock units granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.

Includes 17,422 shares acquired pursuant to grants of restricted stock units.

Grant to the reporting person effective as of March 5, 2026 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, 2029 or earlier upon the occurrence of certain specified circumstances.

Shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on March 5, 2026 of certain restricted stock units granted to the reporting person on June 7, 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan.

Includes 4,926 shares acquired pursuant to grants of restricted stock units.

Grant to the reporting person effective as of March 5, 2026 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, 2029 or earlier upon the occurrence of certain specified circumstances.

Shares acquired pursuant to grants of restricted stock units.

Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, 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 2023 through 2025.

Includes 89,994 shares acquired pursuant to grants of restricted stock units.

Grant to the reporting person effective as of March 5, 2026 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, 2029 or earlier upon the occurrence of certain specified circumstances.

Includes 21,661 shares acquired pursuant to grants of restricted stock units.

Shares earned upon the vesting on March 5, 2026 of certain performance shares granted to the reporting person in 2023 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan. On March 5, 2026, 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 2023 through 2025.

Includes 22,865 shares acquired pursuant to grants of restricted stock units.

Represents the sale of 18,461 shares in multiple transactions, raging from $125.00 to $126.39 per share, resulting in a weighted average sale price of $125.0758 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

Includes 17,962 shares acquired pursuant to grants of restricted stock units.

Represents the sale of 5,000 shares in multiple transactions, ranging from $120.00 to $125.69 per share, resulting in a weighted average sale price of $121.72 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

Grant to the reporting person effective as of February 23, 2026 of restricted stock units under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions on 220 restricted stock units will lapse on February 23, 2029 or earlier upon the occurrence of certain specified circumstances, and all restrictions on the remaining 220 restricted stock units will lapse on February 23, 2031 or earlier upon the occurrence of certain specified circumstances.

Shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on February 19, 2026 of certain restricted stock units granted to the reporting person in 2025 under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated.

Includes 3,808 shares acquired pursuant to grants of restricted stock units.

Represents the sale of 33,000 shares in multiple transactions, ranging from $89.02 to $91.42 per share, resulting in a weighted average sale price of $90.34 per share. The reporting person undertakes to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range. The sales were made as part of the reporting person's financial planning to diversify his stockholdings.

Includes 72,199 shares acquired pursuant to grants of restricted stock units.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on November 7, 2025 of certain restricted stock units granted to the reporting person in 2019 under the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan.

Includes 6,355 shares acquired pursuant to grants of restricted stock units.

Represents the sale of 8,656 shares in multiple transactions, raging from $93.14 to $94.805 per share, resulting in a weighted average sale price of $93.923 per share. The reporting person undertake to provide upon request by the SEC staff, the Registrant, or a security holder of the Registrant, full information regarding the number of shares sold at each separate price within the range.

Includes 11,044 shares acquired pursuant to grants of restricted stock units.

Grant to the reporting person of restricted stock under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated. All restrictions will lapse on September 18, 2026.

Stock received by the reporting person under the Kaiser Aluminum Corporation 2021 Equity and Incentive Compensation Plan, as amended and restated, at such person's election in lieu of all or a portion of the reporting person's annual cash retainer for serving as a member of the Board of Directors of Kaiser Aluminum Corporation, and chair or a member of one or more committees of the Board of Directors.

Equal to the average closing price of the Issuer's common stock as reported by the Nasdaq Stock Market, LLC for the twenty trading days prior to September 18, 2025.

Shares withheld to satisfy the withholding tax obligations resulting from the vesting on August 12, 2025 of certain restricted stock units granted to the reporting person in 2020 under the Kaiser Aluminum Corporation 2016 Equity and Incentive Compensation Plan.

Includes 14,431 shares acquired pursuant to grants of restricted stock units.