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A prior report inadvertently understated the number of derivative securities beneficially owned directly by the Reporting Person by 13,546 shares due to an administrative error. This correction does not reflect any purchase, sale or other transaction by the Reporting Person."}],"balance_after":0,"derivative":{"exercise_price":5.16,"expiration_date":"2029-02-27","underlying":"Common Stock","underlying_shares":13546},"source":{"system":"sec-edgar","filing":"0001700262-26-000011","document":"wk-form4_1789072765.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1700262/000170026226000011/wk-form4_1789072765.xml","form_type":"4"}},{"id":4614794,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22052,"kind":"person","name":"Evans Katie Seitz","position":1,"cik":"0001700262","reported_name":"Evans Katie Seitz","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-09-10T20:39:28.000Z","date":"2026-09-09","kind":"sale","planned":true,"acquired":false,"shares":11100,"price":23.46,"value":260406.0,"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 June 8, 2026."},{"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 $23.095 to $24.00, 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":455797,"source":{"system":"sec-edgar","filing":"0001700262-26-000011","document":"wk-form4_1789072765.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1700262/000170026226000011/wk-form4_1789072765.xml","form_type":"4"}},{"id":4614793,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22052,"kind":"person","name":"Evans Katie Seitz","position":1,"cik":"0001700262","reported_name":"Evans Katie Seitz","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-09-10T20:39:28.000Z","date":"2026-09-08","kind":"sale","planned":true,"acquired":false,"shares":32285,"price":23.63,"value":762894.55,"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 June 8, 2026."},{"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 $23.465 to $23.91, 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":466897,"source":{"system":"sec-edgar","filing":"0001700262-26-000011","document":"wk-form4_1789072765.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1700262/000170026226000011/wk-form4_1789072765.xml","form_type":"4"}},{"id":4614792,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22052,"kind":"person","name":"Evans Katie Seitz","position":1,"cik":"0001700262","reported_name":"Evans Katie Seitz","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common 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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":"0001700262-26-000002","document":"form4-01122026_040109.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000002/form4-01122026_040109.xml","form_type":"4"}},{"id":940741,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22052,"kind":"person","name":"Evans Katie Seitz","position":1,"cik":"0001700262","reported_name":"Evans Katie Seitz","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Operations"}}],"security":"Common Stock","published_at":"2026-01-12T21:30:13.000Z","date":"2026-01-09","kind":"tax_withholding","planned":false,"acquired":false,"shares":26836,"price":16.17,"value":433938.12,"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":535472,"source":{"system":"sec-edgar","filing":"0001700262-26-000002","document":"form4-01122026_040109.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000002/form4-01122026_040109.xml","form_type":"4"}},{"id":940740,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22052,"kind":"person","name":"Evans Katie Seitz","position":1,"cik":"0001700262","reported_name":"Evans Katie Seitz","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Operations"}}],"security":"Common Stock","published_at":"2026-01-12T21:30:13.000Z","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":562308,"source":{"system":"sec-edgar","filing":"0001700262-26-000002","document":"form4-01122026_040109.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000002/form4-01122026_040109.xml","form_type":"4"}},{"id":950037,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22052,"kind":"person","name":"Evans Katie Seitz","position":1,"cik":"0001700262","reported_name":"Evans Katie Seitz","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Operations"}}],"security":"Performance Stock Units","published_at":"2026-01-06T00:14:48.000Z","date":"2026-01-01","kind":"grant","planned":false,"acquired":true,"shares":42757,"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. 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