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The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4."}],"balance_after":51136,"source":{"system":"sec-edgar","filing":"0001350876-26-000005","document":"wk-form4_1789761898.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000135087626000005/wk-form4_1789761898.xml","form_type":"4"}},{"id":692903,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":25380,"kind":"person","name":"Knopper Douglas S","position":1,"cik":"0001350876","reported_name":"Knopper Douglas S","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-08-07T21:10:56.000Z","date":"2026-08-06","kind":"sale","planned":true,"acquired":false,"shares":37337,"price":22.72,"value":848296.64,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 12, 2025."}],"balance_after":88473,"source":{"system":"sec-edgar","filing":"0001350876-26-000003","document":"wk-form4_1786137053.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1350876/000135087626000003/wk-form4_1786137053.xml","form_type":"4"}},{"id":733586,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":25380,"kind":"person","name":"Knopper Douglas S","position":1,"cik":"0001350876","reported_name":"Knopper Douglas S","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-17T22:48:37.000Z","date":"2026-06-16","kind":"sale","planned":true,"acquired":false,"shares":37337,"price":18.1,"value":675799.7,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 12, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. 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The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4."}],"balance_after":125810,"source":{"system":"sec-edgar","filing":"0001193125-26-274508","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1350876/000119312526274508/ownership.xml","form_type":"4"}},{"id":742835,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":25380,"kind":"person","name":"Knopper Douglas S","position":1,"cik":"0001350876","reported_name":"Knopper Douglas S","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:50:12.000Z","date":"2026-06-10","kind":"sale","planned":true,"acquired":false,"shares":10766,"price":15.73,"value":169349.18,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F3","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on December 12, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. 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