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Each restricted stock unit represents the right to receive one ordinary share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,537 restricted stock units which will vest on the earlier of (i) May 1, 2027, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders."}],"balance_after":11644,"source":{"system":"sec-edgar","filing":"0001628280-26-061755","document":"wk-form4_1789399403.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000162828026061755/wk-form4_1789399403.xml","form_type":"4"}},{"id":740277,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2026-06-12T11:59:40.000Z","date":"2026-06-10","kind":"grant","planned":false,"acquired":true,"shares":51,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4523 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,489 restricted stock units which will vest on the earlier of (i) May 1, 2027 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders."}],"balance_after":11596,"source":{"system":"sec-edgar","filing":"0001628280-26-042711","document":"wk-form4_1781279976.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000162828026042711/wk-form4_1781279976.xml","form_type":"4"}},{"id":792110,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2026-05-05T12:52:32.000Z","date":"2026-05-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":2123,"price":38.39,"value":81501.97,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Reflects ordinary shares of Smurfit Westrock plc withheld to satisfy the Reporting Person's tax withholding obligation upon vesting and settlement of RSUs."}],"balance_after":11545,"source":{"system":"sec-edgar","filing":"0001628280-26-030315","document":"wk-form4_1777999949.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000162828026030315/wk-form4_1777999949.xml","form_type":"4"}},{"id":792109,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2026-05-05T12:52:32.000Z","date":"2026-05-01","kind":"grant","planned":false,"acquired":true,"shares":4438,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On May 1st, 2026, the Reporting Person was granted 4,438 restricted stock units (RSUs). Each RSU represents a contingent right to receive one ordinary share. The RSUs are scheduled to vest on the earlier of (i) the first anniversary of the date of grant of the RSU or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders."}],"balance_after":13668,"source":{"system":"sec-edgar","filing":"0001628280-26-030315","document":"wk-form4_1777999949.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000162828026030315/wk-form4_1777999949.xml","form_type":"4"}},{"id":832556,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2026-03-20T13:15:44.000Z","date":"2026-03-18","kind":"grant","planned":false,"acquired":true,"shares":51,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of\n$0.4523 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one\nordinary share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,422 restricted stock units which will vest on the earlier of (i) May 2, 2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders."}],"balance_after":9230,"source":{"system":"sec-edgar","filing":"0001628280-26-020099","document":"wk-form4_1774026941.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000162828026020099/wk-form4_1774026941.xml","form_type":"4"}},{"id":962223,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2025-12-19T11:54:41.000Z","date":"2025-12-18","kind":"grant","planned":false,"acquired":true,"shares":48,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of the restricted stock unit award, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,371 restricted stock units which will vest on the earlier of (i) May 2, 2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders."}],"balance_after":9179,"source":{"system":"sec-edgar","filing":"0001628280-25-058158","document":"wk-form4_1766163277.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000162828025058158/wk-form4_1766163277.xml","form_type":"4"}},{"id":1034889,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2025-09-22T09:20:46.000Z","date":"2025-09-18","kind":"grant","planned":false,"acquired":true,"shares":41,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,323 restricted stock units which will vest on the earlier of (i) May 2, 2026, or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders."}],"balance_after":9131,"source":{"system":"sec-edgar","filing":"0001104659-25-091919","document":"tm2526572-1_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000110465925091919/tm2526572-1_4seq1.xml","form_type":"4"}},{"id":1104067,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2025-06-23T15:02:52.000Z","date":"2025-06-18","kind":"grant","planned":false,"acquired":true,"shares":43,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"In accordance with the terms of outstanding restricted stock units, additional restricted stock units accrued as dividend equivalents in connection with the Issuer's payment of a quarterly dividend of $0.4308 per ordinary share. Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 4,282 restricted stock units which are scheduled to vest on the earlier of (i) May 2,2026 or (ii) the date of the next annual meeting of Smurfit Westrock plc's stockholders."}],"balance_after":9090,"source":{"system":"sec-edgar","filing":"0001062993-25-012035","document":"form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000106299325012035/form4.xml","form_type":"4"}},{"id":1157590,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2025-05-06T13:59:10.000Z","date":"2025-05-02","kind":"tax_withholding","planned":false,"acquired":false,"shares":640,"price":40.47,"value":25900.8,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Reflects ordinary shares of Smurfit Westrock plc withheld to satisfy the Reporting Person's tax withholding obligation upon vesting and settlement of RSUs."}],"balance_after":9047,"source":{"system":"sec-edgar","filing":"0001104659-25-044981","document":"tm2514162-11_4seq1.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2029261/000110465925044981/tm2514162-11_4seq1.xml","form_type":"4"}},{"id":1157589,"issuer":{"id":3199,"kind":"organization","name":"Smurfit Westrock plc","symbol":"SW"},"owners":[{"id":38872,"kind":"person","name":"Fairweather Carol","position":1,"cik":"0002029261","reported_name":"Fairweather Carol","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Ordinary Shares","published_at":"2025-05-06T13:59:10.000Z","date":"2025-05-02","kind":"grant","planned":false,"acquired":true,"shares":4239,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"On May 2nd, 2025, the Reporting Person was granted 4,239 restricted stock units (RSUs). 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Such additional restricted stock units are subject to the same terms and conditions as the underlying award. Each restricted stock unit represents the right to receive one ordinary share."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 2,119 restricted stock units which vest on January 1, 2025. 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