{"transactions":[{"id":854951,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":62167,"kind":"person","name":"Robb Thomas H.","position":1,"cik":"0002105031","reported_name":"Robb Thomas H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP - Manufacturing"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2026-03-09T20:30:22.000Z","date":"2026-03-05","kind":"grant","planned":false,"acquired":true,"shares":2954,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Shares acquired pursuant to grants of restricted stock units."}],"balance_after":17898,"source":{"system":"sec-edgar","filing":"0001193125-26-098641","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000119312526098641/ownership.xml","form_type":"4"}},{"id":883069,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":62167,"kind":"person","name":"Robb Thomas H.","position":1,"cik":"0002105031","reported_name":"Robb Thomas H.","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP - Manufacturing"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2026-02-25T21:57:28.000Z","date":"2026-02-23","kind":"grant","planned":false,"acquired":true,"shares":440,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"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."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Shares acquired pursuant to grants of restricted stock units."}],"balance_after":14944,"source":{"system":"sec-edgar","filing":"0001193125-26-071971","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000119312526071971/ownership.xml","form_type":"4"}}]}