{"transactions":[{"id":4631959,"issuer":{"id":1046,"kind":"organization","name":"MATTEL INC /DE/","symbol":"MAT"},"owners":[{"id":27025,"kind":"person","name":"Stanichi Roberto Seixas","position":1,"cik":"0002148131","reported_name":"Stanichi Roberto Seixas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres., Chief Mktg & Brand Ofc"}}],"security":"Restricted Stock Units","published_at":"2026-10-03T00:22:05.000Z","date":"2026-09-30","kind":"exercise","planned":false,"acquired":false,"shares":1715,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"As reported on a Form 3 dated July 29, 2026 and filed on August 4, 2026, the Reporting Person received a grant of 5,199 Restricted Stock Units (\"RSUs\" or \"Units\") on September 30, 2025. The RSUs vest as to (a) 33% of the Units granted on the first anniversary of the date of grant, (b) an additional 33% of the Units granted on the second anniversary of the date of grant, and (c) the remaining 34% of the Units granted on the third anniversary of the date of grant. On each vesting date, for each Unit vesting on such date, the Reporting Person will receive one share of Mattel, Inc. Common Stock, subject to tax withholding. On September 30, 2026, the first 33% of these RSUs vested, resulting in the issuance of 1,715 shares of Mattel, Inc. Common Stock."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"As reported on a Form 3 dated July 29, 2026 and filed on August 4, 2026, the Reporting Person received a grant of 5,199 Restricted Stock Units (\"RSUs\" or \"Units\") on September 30, 2025. The RSUs vest as to (a) 33% of the Units granted on the first anniversary of the date of grant, (b) an additional 33% of the Units granted on the second anniversary of the date of grant, and (c) the remaining 34% of the Units granted on the third anniversary of the date of grant. On each vesting date, for each Unit vesting on such date, the Reporting Person will receive one share of Mattel, Inc. Common Stock, subject to tax withholding. On September 30, 2026, the first 33% of these RSUs vested, resulting in the issuance of 1,715 shares of Mattel, Inc. Common Stock."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"As reported on a Form 3 dated July 29, 2026 and filed on August 4, 2026, the Reporting Person received a grant of 5,199 Restricted Stock Units (\"RSUs\" or \"Units\") on September 30, 2025. The RSUs vest as to (a) 33% of the Units granted on the first anniversary of the date of grant, (b) an additional 33% of the Units granted on the second anniversary of the date of grant, and (c) the remaining 34% of the Units granted on the third anniversary of the date of grant. On each vesting date, for each Unit vesting on such date, the Reporting Person will receive one share of Mattel, Inc. Common Stock, subject to tax withholding. On September 30, 2026, the first 33% of these RSUs vested, resulting in the issuance of 1,715 shares of Mattel, Inc. Common Stock."}],"balance_after":3484,"derivative":{"underlying":"Common Stock","underlying_shares":1715},"source":{"system":"sec-edgar","filing":"0002148131-26-000006","document":"wk-form4_1790972523.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/63276/000214813126000006/wk-form4_1790972523.xml","form_type":"4"}},{"id":4631958,"issuer":{"id":1046,"kind":"organization","name":"MATTEL INC /DE/","symbol":"MAT"},"owners":[{"id":27025,"kind":"person","name":"Stanichi Roberto Seixas","position":1,"cik":"0002148131","reported_name":"Stanichi Roberto Seixas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres., Chief Mktg & Brand Ofc"}}],"security":"Common Stock","published_at":"2026-10-03T00:22:05.000Z","date":"2026-09-30","kind":"tax_withholding","planned":false,"acquired":false,"shares":873,"price":12.66,"value":11052.18,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F2","text":"Pursuant to the terms of the September 30, 2025 RSU grant, 873 shares of Mattel, Inc. Common Stock were automatically withheld at vesting to cover required tax withholding."}],"balance_after":46771,"source":{"system":"sec-edgar","filing":"0002148131-26-000006","document":"wk-form4_1790972523.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/63276/000214813126000006/wk-form4_1790972523.xml","form_type":"4"}},{"id":4631957,"issuer":{"id":1046,"kind":"organization","name":"MATTEL INC /DE/","symbol":"MAT"},"owners":[{"id":27025,"kind":"person","name":"Stanichi Roberto Seixas","position":1,"cik":"0002148131","reported_name":"Stanichi Roberto Seixas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres., Chief Mktg & Brand Ofc"}}],"security":"Common Stock","published_at":"2026-10-03T00:22:05.000Z","date":"2026-09-30","kind":"exercise","planned":false,"acquired":true,"shares":1715,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"As reported on a Form 3 dated July 29, 2026 and filed on August 4, 2026, the Reporting Person received a grant of 5,199 Restricted Stock Units (\"RSUs\" or \"Units\") on September 30, 2025. The RSUs vest as to (a) 33% of the Units granted on the first anniversary of the date of grant, (b) an additional 33% of the Units granted on the second anniversary of the date of grant, and (c) the remaining 34% of the Units granted on the third anniversary of the date of grant. On each vesting date, for each Unit vesting on such date, the Reporting Person will receive one share of Mattel, Inc. Common Stock, subject to tax withholding. On September 30, 2026, the first 33% of these RSUs vested, resulting in the issuance of 1,715 shares of Mattel, Inc. Common Stock."}],"balance_after":47644,"source":{"system":"sec-edgar","filing":"0002148131-26-000006","document":"wk-form4_1790972523.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/63276/000214813126000006/wk-form4_1790972523.xml","form_type":"4"}},{"id":698445,"issuer":{"id":1046,"kind":"organization","name":"MATTEL INC /DE/","symbol":"MAT"},"owners":[{"id":27025,"kind":"person","name":"Stanichi Roberto Seixas","position":1,"cik":"0002148131","reported_name":"Stanichi Roberto Seixas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Pres., Chief Mktg & Brand Ofc"}}],"security":"Restricted Stock Units","published_at":"2026-08-04T21:53:39.000Z","date":"2026-07-31","kind":"grant","planned":false,"acquired":true,"shares":132538,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"The Restricted Stock Units (\"RSUs\" or \"Units\") were granted on July 31, 2026 pursuant to the Mattel, Inc. Amended and Restated 2010 Equity and Long-Term Compensation Plan, as amended (the \"Plan\").  Each Unit represents a contingent right to receive one share of Mattel, Inc. Common Stock (or, at the election of Mattel, Inc., a cash amount equal to the fair market value of such share)."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The RSUs vest as to 50% of the Units granted on the first anniversary of the date of grant and as to the remaining 50% of the Units granted on the second anniversary of the date of grant.  On each vesting date, for each Unit vesting on such date, the Reporting Person will receive one share of Mattel, Inc. Common Stock (or, at the election of Mattel, Inc., a cash amount equal to the fair market value of one share of Common Stock on the date of vesting), subject to tax withholding."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F3","text":"The RSUs vest as to 50% of the Units granted on the first anniversary of the date of grant and as to the remaining 50% of the Units granted on the second anniversary of the date of grant.  On each vesting date, for each Unit vesting on such date, the Reporting Person will receive one share of Mattel, Inc. 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Common Stock (or, at the election of Mattel, Inc., a cash amount equal to the fair market value of one share of Common Stock on the date of vesting), subject to tax withholding."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F2","text":"The RSUs vest as to (a) 33% of the Units granted on the first anniversary of the date of grant, (b) an additional 33% of the Units granted on the second anniversary of the date of grant, and (c) the remaining 34% of the Units granted on the third anniversary of the date of grant.  On each vesting date, for each Unit vesting on such date, the Reporting Person will receive one share of Mattel, Inc. 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