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The number of PSUs reported in column 5 on the Form 4 filed with the Securities and Exchange Commission on January 4, 2023 reflected the target number of PSUs initially subject to the award. The award was eligible to vest as to 0% to 150% of the target number of PSUs. On January 9, 2026, the Compensation Committee of the Issuer's Board of Directors determined that, based on 126.35% achievement, the Reporting Person actually vested 51,300 shares."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"Vesting of the PSU was determined based on the Issuer's total stockholder return (\"TSR\") for the three-year period beginning on January 1, 2023 relative to the TSRs of the companies in the Russell 2000 index over that period. The number of PSUs reported in column 5 on the Form 4 filed with the Securities and Exchange Commission on January 4, 2023 reflected the target number of PSUs initially subject to the award. The award was eligible to vest as to 0% to 150% of the target number of PSUs. On January 9, 2026, the Compensation Committee of the Issuer's Board of Directors determined that, based on 126.35% achievement, the Reporting Person actually vested 51,300 shares."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":51300},"source":{"system":"sec-edgar","filing":"0001725125-26-000002","document":"form4-01122026_040113.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512526000002/form4-01122026_040113.xml","form_type":"4"}},{"id":940747,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common Stock","published_at":"2026-01-12T21:30:20.000Z","date":"2026-01-09","kind":"tax_withholding","planned":false,"acquired":false,"shares":25330,"price":16.17,"value":409586.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"Represents the non-discretionary forfeiture of shares on behalf of the Reporting Person pursuant to an arrangement mandated by the Issuer to cover the tax withholding obligations associated with the vesting of the performance stock units (\"PSUs\") being reported herein."}],"balance_after":428887,"source":{"system":"sec-edgar","filing":"0001725125-26-000002","document":"form4-01122026_040113.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512526000002/form4-01122026_040113.xml","form_type":"4"}},{"id":940746,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common Stock","published_at":"2026-01-12T21:30:20.000Z","date":"2026-01-09","kind":"exercise","planned":false,"acquired":true,"shares":51300,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan."}],"balance_after":454217,"source":{"system":"sec-edgar","filing":"0001725125-26-000002","document":"form4-01122026_040113.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512526000002/form4-01122026_040113.xml","form_type":"4"}},{"id":950039,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Performance Stock Units","published_at":"2026-01-06T00:16:29.000Z","date":"2026-01-01","kind":"grant","planned":false,"acquired":true,"shares":25801,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each performance stock unit (\"PSU\") represents a contingent right to receive on vesting one share of the Issuer's common stock."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The PSUs will generally vest on the three-year anniversary of the grant date of the award subject to the Reporting Person's continued service through such date. The number of shares vested will be determined based on the Issuer's total stockholder return (\"TSR\") relative to the TSRs of the companies in the Russell 2000 index for the three year-period beginning January 1, 2026, as well as certain interim measurements based on relative TSR for the one-year and two-year periods beginning on January 1, 2026. The number of PSUs reported in column 5 reflects the target number of PSUs subject to the award. The award is eligible to vest as to 0% to 150% of the target number of PSUs."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F4","text":"The PSUs will generally vest on the three-year anniversary of the grant date of the award subject to the Reporting Person's continued service through such date. The number of shares vested will be determined based on the Issuer's total stockholder return (\"TSR\") relative to the TSRs of the companies in the Russell 2000 index for the three year-period beginning January 1, 2026, as well as certain interim measurements based on relative TSR for the one-year and two-year periods beginning on January 1, 2026. The number of PSUs reported in column 5 reflects the target number of PSUs subject to the award. The award is eligible to vest as to 0% to 150% of the target number of PSUs."}],"balance_after":25801,"derivative":{"underlying":"Common Stock","underlying_shares":25801},"source":{"system":"sec-edgar","filing":"0001725125-26-000001","document":"form4-01062026_120124.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512526000001/form4-01062026_120124.xml","form_type":"4"}},{"id":950038,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common Stock","published_at":"2026-01-06T00:16:29.000Z","date":"2026-01-01","kind":"grant","planned":false,"acquired":true,"shares":76803,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest as follows: 20,801 on February 15, 2027, 4,800 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2029 and 3,202 on February 15, 2030, subject to continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan."}],"balance_after":402917,"source":{"system":"sec-edgar","filing":"0001725125-26-000001","document":"form4-01062026_120124.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512526000001/form4-01062026_120124.xml","form_type":"4"}},{"id":961824,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT 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subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2025."}],"balance_after":326114,"source":{"system":"sec-edgar","filing":"0001725125-25-000006","document":"form4-12192025_041203.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512525000006/form4-12192025_041203.xml","form_type":"4"}},{"id":961822,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common 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These shares were sold in multiple transactions at prices ranging from $13.13 to $13.30, inclusive. 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":326114,"source":{"system":"sec-edgar","filing":"0001725125-25-000004","document":"form4-11192025_121145.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512525000004/form4-11192025_121145.xml","form_type":"4"}},{"id":995188,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common Stock","published_at":"2025-11-19T00:39:49.000Z","date":"2025-11-15","kind":"tax_withholding","planned":true,"acquired":false,"shares":9422,"price":14.15,"value":133321.3,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"Represents the non-discretionary forfeiture of shares on behalf of the Reporting Person pursuant to an arrangement mandated by the Issuer to cover the tax withholding obligations associated with the vesting of restricted stock units."}],"balance_after":336971,"source":{"system":"sec-edgar","filing":"0001725125-25-000004","document":"form4-11192025_121145.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512525000004/form4-11192025_121145.xml","form_type":"4"}},{"id":1047537,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2025-09-04T21:00:27.000Z","date":"2025-09-02","kind":"exercise","planned":true,"acquired":false,"shares":24986,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 28, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F5","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":96657,"derivative":{"exercise_price":4.92,"expiration_date":"2029-02-20","underlying":"Common Stock","underlying_shares":24986},"source":{"system":"sec-edgar","filing":"0001415889-25-023709","document":"form4-09042025_050920.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000141588925023709/form4-09042025_050920.xml","form_type":"4"}},{"id":1047536,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common Stock","published_at":"2025-09-04T21:00:27.000Z","date":"2025-09-02","kind":"sale","planned":true,"acquired":false,"shares":15717,"price":24.97,"value":392453.49,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 28, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.78 to $25.05, inclusive. 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":346393,"source":{"system":"sec-edgar","filing":"0001415889-25-023709","document":"form4-09042025_050920.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000141588925023709/form4-09042025_050920.xml","form_type":"4"}},{"id":1047535,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common Stock","published_at":"2025-09-04T21:00:27.000Z","date":"2025-09-02","kind":"sale","planned":true,"acquired":false,"shares":9269,"price":24.22,"value":224495.18,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 28, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.74 to $24.66, inclusive. 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":362110,"source":{"system":"sec-edgar","filing":"0001415889-25-023709","document":"form4-09042025_050920.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000141588925023709/form4-09042025_050920.xml","form_type":"4"}},{"id":1047534,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common Stock","published_at":"2025-09-04T21:00:27.000Z","date":"2025-09-02","kind":"exercise","planned":true,"acquired":true,"shares":24986,"price":4.92,"value":122931.12,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 28, 2025."}],"balance_after":371379,"source":{"system":"sec-edgar","filing":"0001415889-25-023709","document":"form4-09042025_050920.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000141588925023709/form4-09042025_050920.xml","form_type":"4"}},{"id":1059976,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":65853,"kind":"person","name":"Soroca Adam Lee","position":1,"cik":"0001725125","reported_name":"Soroca Adam Lee","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF PRODUCT OFFICER"}}],"security":"Common Stock","published_at":"2025-08-20T20:30:25.000Z","date":"2025-08-19","kind":"sale","planned":true,"acquired":false,"shares":10579,"price":23.47,"value":248289.13,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 7, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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