{"transactions":[{"id":854948,"issuer":{"id":4302,"kind":"organization","name":"KAISER ALUMINUM CORP","symbol":"KALU"},"owners":[{"id":62166,"kind":"person","name":"Barger Hugh J. III","position":1,"cik":"0002104698","reported_name":"Barger Hugh J. III","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP - Sales & Marketing"}}],"security":"Common Stock, par value $0.01 per share","published_at":"2026-03-09T20:30:16.000Z","date":"2026-03-05","kind":"grant","planned":false,"acquired":true,"shares":1686,"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":5711,"source":{"system":"sec-edgar","filing":"0001193125-26-098636","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/811596/000119312526098636/ownership.xml","form_type":"4"}}]}