{"transactions":[{"id":4640337,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22175,"kind":"person","name":"Caine Paul","position":1,"cik":"0001411765","reported_name":"Caine Paul","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-10-14T20:30:02.000Z","date":"2026-10-12","kind":"sale","planned":true,"acquired":false,"shares":12500,"price":25.29,"value":316125.0,"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 August 20, 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 $24.92 to $25.50, 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":124901,"source":{"system":"sec-edgar","filing":"0001411765-26-000011","document":"wk-form4_1792009799.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000141176526000011/wk-form4_1792009799.xml","form_type":"4"}},{"id":4635401,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":184198,"kind":"person","name":"Sullivan Haas","position":1,"cik":"0002156224","reported_name":"Sullivan Haas","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF ACCOUNTING OFFICER"}}],"security":"Common Stock","published_at":"2026-10-03T00:26:17.000Z","date":"2026-10-01","kind":"grant","planned":false,"acquired":true,"shares":24641,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest as follows: 6,674 on November 15, 2027, 1,540 on each February 15, May 15, August 15, and November 15 thereafter until August 15, 2030 and 1,027 on November 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":97554,"source":{"system":"sec-edgar","filing":"0002156224-26-000005","document":"wk-form4_1790972773.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000215622426000005/wk-form4_1790972773.xml","form_type":"4"}},{"id":4635402,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22051,"kind":"person","name":"Gephart Brian","position":1,"cik":"0001778484","reported_name":"Gephart Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-10-03T00:21:51.000Z","date":"2026-10-01","kind":"grant","planned":false,"acquired":true,"shares":64682,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest as follows: 17,518 on November 15, 2027, 4,043 on each February 15, May 15, August 15, and November 15 thereafter until August 15, 2030 and 2,691 on November 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":167010,"source":{"system":"sec-edgar","filing":"0001778484-26-000010","document":"wk-form4_1790972508.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000177848426000010/wk-form4_1790972508.xml","form_type":"4"}},{"id":4622797,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22175,"kind":"person","name":"Caine Paul","position":1,"cik":"0001411765","reported_name":"Caine Paul","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-18T20:06:12.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":7500,"price":26.5,"value":198750.0,"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 August 20, 2025."}],"balance_after":137401,"source":{"system":"sec-edgar","filing":"0001411765-26-000009","document":"wk-form4_1789761967.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000141176526000009/wk-form4_1789761967.xml","form_type":"4"}},{"id":4622750,"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":"2026-09-18T20:05:01.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":37337,"price":26.28,"value":981216.36,"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. These shares were sold in multiple transactions at prices ranging from $26.00 to $26.50, 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":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":4619355,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-09-16T20:23:15.000Z","date":"2026-09-14","kind":"sale","planned":true,"acquired":false,"shares":1165,"price":24,"value":27960.0,"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 13, 2026."}],"balance_after":245155,"source":{"system":"sec-edgar","filing":"0001966857-26-000015","document":"wk-form4_1789590192.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1966857/000196685726000015/wk-form4_1789590192.xml","form_type":"4"}},{"id":4619330,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39559,"kind":"person","name":"Spillane Robert F","position":1,"cik":"0001603808","reported_name":"Spillane Robert F","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Stock Option (right to buy)","published_at":"2026-09-16T20:20:39.000Z","date":"2026-09-14","kind":"exercise","planned":false,"acquired":false,"shares":10363,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":0,"derivative":{"exercise_price":5.17,"expiration_date":"2027-05-23","underlying":"Common Stock","underlying_shares":10363},"source":{"system":"sec-edgar","filing":"0001603808-26-000005","document":"wk-form4_1789590036.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1603808/000160380826000005/wk-form4_1789590036.xml","form_type":"4"}},{"id":4619329,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39559,"kind":"person","name":"Spillane Robert F","position":1,"cik":"0001603808","reported_name":"Spillane Robert F","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-16T20:20:39.000Z","date":"2026-09-14","kind":"sale","planned":false,"acquired":false,"shares":10363,"price":23.76,"value":246224.88,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.75 to $23.7901, 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":57715,"source":{"system":"sec-edgar","filing":"0001603808-26-000005","document":"wk-form4_1789590036.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1603808/000160380826000005/wk-form4_1789590036.xml","form_type":"4"}},{"id":4619328,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39559,"kind":"person","name":"Spillane Robert F","position":1,"cik":"0001603808","reported_name":"Spillane Robert F","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-16T20:20:39.000Z","date":"2026-09-14","kind":"exercise","planned":false,"acquired":true,"shares":10363,"price":5.17,"value":53576.71,"ownership":{"direct":true},"balance_after":68078,"source":{"system":"sec-edgar","filing":"0001603808-26-000005","document":"wk-form4_1789590036.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1603808/000160380826000005/wk-form4_1789590036.xml","form_type":"4"}},{"id":4615896,"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":"2026-09-11T20:19:56.000Z","date":"2026-09-11","kind":"sale","planned":true,"acquired":false,"shares":13997,"price":24,"value":335928.0,"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."}],"balance_after":441800,"source":{"system":"sec-edgar","filing":"0001700262-26-000013","document":"wk-form4_1789157993.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1700262/000170026226000013/wk-form4_1789157993.xml","form_type":"4"}},{"id":4615870,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22587,"kind":"person","name":"Saltz Aaron","position":1,"cik":"0001807986","reported_name":"Saltz Aaron","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF LEGAL OFFICER"}}],"security":"Common Stock","published_at":"2026-09-11T20:15:46.000Z","date":"2026-09-10","kind":"sale","planned":true,"acquired":false,"shares":40000,"price":23.41,"value":936400.0,"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 11, 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 $23.3667 to $23.5250, 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":224389,"source":{"system":"sec-edgar","filing":"0001807986-26-000009","document":"wk-form4_1789157744.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1807986/000180798626000009/wk-form4_1789157744.xml","form_type":"4"}},{"id":4615848,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22175,"kind":"person","name":"Caine Paul","position":1,"cik":"0001411765","reported_name":"Caine Paul","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-09-11T20:11:58.000Z","date":"2026-09-10","kind":"sale","planned":true,"acquired":false,"shares":5000,"price":23.53,"value":117650.0,"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 August 20, 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 $23.22 to $23.63, 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":144901,"source":{"system":"sec-edgar","filing":"0001411765-26-000007","document":"wk-form4_1789157516.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000141176526000007/wk-form4_1789157516.xml","form_type":"4"}},{"id":4614795,"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":"Employee Stock Option (Right to Buy)","published_at":"2026-09-10T20:39:28.000Z","date":"2026-09-08","kind":"exercise","planned":true,"acquired":false,"shares":13546,"price":0,"value":0.0,"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":"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F6","text":"The amount reported in Column 9 reflects a correction to the number of derivative securities beneficially owned directly by the Reporting Person. 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 Stock","published_at":"2026-09-10T20:39:28.000Z","date":"2026-09-08","kind":"exercise","planned":true,"acquired":true,"shares":13546,"price":5.16,"value":69897.36,"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."}],"balance_after":499182,"source":{"system":"sec-edgar","filing":"0001700262-26-000011","document":"wk-form4_1789072765.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1700262/000170026226000011/wk-form4_1789072765.xml","form_type":"4"}},{"id":2915,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-09-03T20:56:22.000Z","date":"2026-09-02","kind":"sale","planned":true,"acquired":false,"shares":1043,"price":25,"value":26075.0,"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 September 11, 2025."}],"balance_after":246320,"source":{"system":"sec-edgar","filing":"0001966857-26-000013","document":"wk-form4_1788468980.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1966857/000196685726000013/wk-form4_1788468980.xml","form_type":"4"}},{"id":2914,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-09-03T20:56:22.000Z","date":"2026-09-01","kind":"sale","planned":true,"acquired":false,"shares":5371,"price":23.42,"value":125788.82,"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 September 11, 2025."}],"balance_after":247363,"source":{"system":"sec-edgar","filing":"0001966857-26-000013","document":"wk-form4_1788468980.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1966857/000196685726000013/wk-form4_1788468980.xml","form_type":"4"}},{"id":672764,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":18648,"kind":"person","name":"Harden Sarah Patricia","position":1,"cik":"0001781873","reported_name":"Harden Sarah Patricia","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-08-28T22:36:14.000Z","date":"2026-08-28","kind":"sale","planned":true,"acquired":false,"shares":18436,"price":24,"value":442464.0,"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 May 27, 2026."}],"balance_after":114751,"source":{"system":"sec-edgar","filing":"0001781873-26-000003","document":"wk-form4_1787956571.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000178187326000003/wk-form4_1787956571.xml","form_type":"4"}},{"id":672763,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":18648,"kind":"person","name":"Harden Sarah Patricia","position":1,"cik":"0001781873","reported_name":"Harden Sarah Patricia","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-08-28T22:36:14.000Z","date":"2026-08-26","kind":"sale","planned":true,"acquired":false,"shares":30550,"price":23.31,"value":712120.5,"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 May 27, 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 $23.09 to $23.52, 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":133187,"source":{"system":"sec-edgar","filing":"0001781873-26-000003","document":"wk-form4_1787956571.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000178187326000003/wk-form4_1787956571.xml","form_type":"4"}},{"id":682796,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-08-18T20:25:12.000Z","date":"2026-08-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":8102,"price":24.73,"value":200362.46,"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":252734,"source":{"system":"sec-edgar","filing":"0001966857-26-000011","document":"wk-form4_1787084710.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000196685726000011/wk-form4_1787084710.xml","form_type":"4"}},{"id":682795,"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":"2026-08-18T20:23:15.000Z","date":"2026-08-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":11204,"price":24.73,"value":277074.92,"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":485636,"source":{"system":"sec-edgar","filing":"0001700262-26-000009","document":"wk-form4_1787084592.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000009/wk-form4_1787084592.xml","form_type":"4"}},{"id":684651,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22587,"kind":"person","name":"Saltz Aaron","position":1,"cik":"0001807986","reported_name":"Saltz Aaron","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF LEGAL OFFICER"}}],"security":"Common Stock","published_at":"2026-08-18T20:21:26.000Z","date":"2026-08-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":5627,"price":24.73,"value":139155.71,"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":264389,"source":{"system":"sec-edgar","filing":"0001807986-26-000007","document":"wk-form4_1787084484.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1807986/000180798626000007/wk-form4_1787084484.xml","form_type":"4"}},{"id":682794,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22051,"kind":"person","name":"Gephart Brian","position":1,"cik":"0001778484","reported_name":"Gephart Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF ACCOUNTING OFFICER"}}],"security":"Common Stock","published_at":"2026-08-18T20:20:14.000Z","date":"2026-08-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":3789,"price":24.73,"value":93701.97,"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":102328,"source":{"system":"sec-edgar","filing":"0001778484-26-000008","document":"wk-form4_1787084411.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000177848426000008/wk-form4_1787084411.xml","form_type":"4"}},{"id":684137,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-08-18T20:19:07.000Z","date":"2026-08-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":10404,"price":24.73,"value":257290.92,"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":392670,"source":{"system":"sec-edgar","filing":"0001100612-26-000011","document":"wk-form4_1787084342.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000110061226000011/wk-form4_1787084342.xml","form_type":"4"}},{"id":682946,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22090,"kind":"person","name":"Day David","position":1,"cik":"0001523288","reported_name":"Day David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-08-18T20:17:48.000Z","date":"2026-08-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":14170,"price":24.73,"value":350424.1,"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":452861,"source":{"system":"sec-edgar","filing":"0001523288-26-000010","document":"wk-form4_1787084266.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1523288/000152328826000010/wk-form4_1787084266.xml","form_type":"4"}},{"id":683307,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22175,"kind":"person","name":"Caine Paul","position":1,"cik":"0001411765","reported_name":"Caine Paul","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-08-18T20:16:17.000Z","date":"2026-08-14","kind":"sale","planned":true,"acquired":false,"shares":7500,"price":25,"value":187500.0,"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 August 20, 2025."}],"balance_after":149901,"source":{"system":"sec-edgar","filing":"0001411765-26-000005","document":"wk-form4_1787084175.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1411765/000141176526000005/wk-form4_1787084175.xml","form_type":"4"}},{"id":683722,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-08-18T20:14:39.000Z","date":"2026-08-18","kind":"sale","planned":true,"acquired":false,"shares":2759,"price":25,"value":68975.0,"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 September 10, 2025."}],"balance_after":293060,"source":{"system":"sec-edgar","filing":"0001865116-26-000009","document":"wk-form4_1787084076.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000009/wk-form4_1787084076.xml","form_type":"4"}},{"id":683721,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-08-18T20:14:39.000Z","date":"2026-08-17","kind":"sale","planned":true,"acquired":false,"shares":8271,"price":24.31,"value":201068.01,"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 September 10, 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 $24.05 to $24.55, 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":295819,"source":{"system":"sec-edgar","filing":"0001865116-26-000009","document":"wk-form4_1787084076.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000009/wk-form4_1787084076.xml","form_type":"4"}},{"id":683720,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-08-18T20:14:39.000Z","date":"2026-08-15","kind":"tax_withholding","planned":true,"acquired":false,"shares":11715,"price":24.73,"value":289711.95,"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":304090,"source":{"system":"sec-edgar","filing":"0001865116-26-000009","document":"wk-form4_1787084076.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000009/wk-form4_1787084076.xml","form_type":"4"}},{"id":686530,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22090,"kind":"person","name":"Day David","position":1,"cik":"0001523288","reported_name":"Day David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-08-14T20:16:40.000Z","date":"2026-08-13","kind":"gift","planned":false,"acquired":false,"shares":26258,"price":0,"value":0.0,"ownership":{"direct":true},"balance_after":467031,"source":{"system":"sec-edgar","filing":"0001523288-26-000008","document":"wk-form4_1786738597.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1523288/000152328826000008/wk-form4_1786738597.xml","form_type":"4"}},{"id":688923,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22051,"kind":"person","name":"Gephart Brian","position":1,"cik":"0001778484","reported_name":"Gephart Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF ACCOUNTING OFFICER"}}],"security":"Common Stock","published_at":"2026-08-12T20:54:23.000Z","date":"2026-08-10","kind":"sale","planned":false,"acquired":false,"shares":12479,"price":24.68,"value":307981.72,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.68 to $24.71, 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."}],"balance_after":106117,"source":{"system":"sec-edgar","filing":"0001778484-26-000006","document":"wk-form4_1786568060.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000177848426000006/wk-form4_1786568060.xml","form_type":"4"}},{"id":688949,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":24029,"kind":"person","name":"Lam Rachel","position":1,"cik":"0001579232","reported_name":"Lam Rachel","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-08-12T20:51:26.000Z","date":"2026-08-10","kind":"sale","planned":false,"acquired":false,"shares":10000,"price":24.16,"value":241600.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.11 to $24.20, 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."}],"balance_after":230620,"source":{"system":"sec-edgar","filing":"0001579232-26-000004","document":"wk-form4_1786567883.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1579232/000157923226000004/wk-form4_1786567883.xml","form_type":"4"}},{"id":689168,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22175,"kind":"person","name":"Caine Paul","position":1,"cik":"0001411765","reported_name":"Caine Paul","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-08-12T20:49:07.000Z","date":"2026-08-10","kind":"sale","planned":true,"acquired":false,"shares":5000,"price":24.35,"value":121750.0,"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 August 20, 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 $24.07 to $24.91, 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":157401,"source":{"system":"sec-edgar","filing":"0001411765-26-000003","document":"wk-form4_1786567744.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1411765/000141176526000003/wk-form4_1786567744.xml","form_type":"4"}},{"id":693157,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Stock Option (right to buy)","published_at":"2026-08-07T21:14:08.000Z","date":"2026-08-06","kind":"exercise","planned":true,"acquired":false,"shares":28703,"price":0,"value":0.0,"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 September 10, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":57405,"derivative":{"exercise_price":13.9,"expiration_date":"2032-02-01","underlying":"Common Stock","underlying_shares":28703},"source":{"system":"sec-edgar","filing":"0001865116-26-000007","document":"wk-form4_1786137246.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000007/wk-form4_1786137246.xml","form_type":"4"}},{"id":693156,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-08-07T21:14:08.000Z","date":"2026-08-06","kind":"sale","planned":true,"acquired":false,"shares":19237,"price":23,"value":442451.0,"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 September 10, 2025."}],"balance_after":315805,"source":{"system":"sec-edgar","filing":"0001865116-26-000007","document":"wk-form4_1786137246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000007/wk-form4_1786137246.xml","form_type":"4"}},{"id":693155,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-08-07T21:14:08.000Z","date":"2026-08-06","kind":"sale","planned":true,"acquired":false,"shares":47942,"price":25.09,"value":1202864.78,"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 September 10, 2025."}],"balance_after":335042,"source":{"system":"sec-edgar","filing":"0001865116-26-000007","document":"wk-form4_1786137246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000007/wk-form4_1786137246.xml","form_type":"4"}},{"id":693154,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-08-07T21:14:08.000Z","date":"2026-08-06","kind":"exercise","planned":true,"acquired":true,"shares":28703,"price":13.9,"value":398971.7,"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 September 10, 2025."}],"balance_after":382984,"source":{"system":"sec-edgar","filing":"0001865116-26-000007","document":"wk-form4_1786137246.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000007/wk-form4_1786137246.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":692786,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-08-07T21:09:41.000Z","date":"2026-08-06","kind":"sale","planned":true,"acquired":false,"shares":871,"price":25,"value":21775.0,"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 September 11, 2025."}],"balance_after":260836,"source":{"system":"sec-edgar","filing":"0001966857-26-000009","document":"wk-form4_1786136978.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000196685726000009/wk-form4_1786136978.xml","form_type":"4"}},{"id":692785,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-08-07T21:09:41.000Z","date":"2026-08-06","kind":"sale","planned":true,"acquired":false,"shares":2602,"price":24,"value":62448.0,"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 September 11, 2025."}],"balance_after":261707,"source":{"system":"sec-edgar","filing":"0001966857-26-000009","document":"wk-form4_1786136978.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000196685726000009/wk-form4_1786136978.xml","form_type":"4"}},{"id":692784,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-08-07T21:09:41.000Z","date":"2026-08-06","kind":"sale","planned":true,"acquired":false,"shares":4176,"price":22.81,"value":95254.56,"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 September 11, 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 $22.72 to $23.00, 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":264309,"source":{"system":"sec-edgar","filing":"0001966857-26-000009","document":"wk-form4_1786136978.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000196685726000009/wk-form4_1786136978.xml","form_type":"4"}},{"id":692804,"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":"Employee Stock Option (Right to Buy)","published_at":"2026-08-07T21:06:14.000Z","date":"2026-08-06","kind":"exercise","planned":true,"acquired":false,"shares":20000,"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 August 28, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":0,"derivative":{"exercise_price":5.16,"expiration_date":"2029-02-27","underlying":"Common Stock","underlying_shares":20000},"source":{"system":"sec-edgar","filing":"0001700262-26-000007","document":"wk-form4_1786136771.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000007/wk-form4_1786136771.xml","form_type":"4"}},{"id":692803,"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":"2026-08-07T21:06:14.000Z","date":"2026-08-06","kind":"sale","planned":true,"acquired":false,"shares":20000,"price":24,"value":480000.0,"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 August 28, 2025."}],"balance_after":496840,"source":{"system":"sec-edgar","filing":"0001700262-26-000007","document":"wk-form4_1786136771.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000007/wk-form4_1786136771.xml","form_type":"4"}},{"id":692802,"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":"2026-08-07T21:06:14.000Z","date":"2026-08-06","kind":"exercise","planned":true,"acquired":true,"shares":20000,"price":5.16,"value":103200.0,"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 August 28, 2025."}],"balance_after":516840,"source":{"system":"sec-edgar","filing":"0001700262-26-000007","document":"wk-form4_1786136771.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000007/wk-form4_1786136771.xml","form_type":"4"}},{"id":693395,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Stock Option (right to buy)","published_at":"2026-08-07T21:00:16.000Z","date":"2026-08-06","kind":"exercise","planned":true,"acquired":false,"shares":293968,"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 March 13, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":0,"derivative":{"exercise_price":5.8,"expiration_date":"2027-03-17","underlying":"Common Stock","underlying_shares":293968},"source":{"system":"sec-edgar","filing":"0001100612-26-000009","document":"wk-form4_1786136414.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000110061226000009/wk-form4_1786136414.xml","form_type":"4"}},{"id":693394,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-08-07T21:00:16.000Z","date":"2026-08-06","kind":"sale","planned":true,"acquired":false,"shares":293968,"price":22.72,"value":6678952.96,"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 March 13, 2026."}],"balance_after":403074,"source":{"system":"sec-edgar","filing":"0001100612-26-000009","document":"wk-form4_1786136414.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000110061226000009/wk-form4_1786136414.xml","form_type":"4"}},{"id":693393,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-08-07T21:00:16.000Z","date":"2026-08-06","kind":"exercise","planned":true,"acquired":true,"shares":293968,"price":5.8,"value":1705014.4,"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 March 13, 2026."}],"balance_after":697042,"source":{"system":"sec-edgar","filing":"0001100612-26-000009","document":"wk-form4_1786136414.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000110061226000009/wk-form4_1786136414.xml","form_type":"4"}},{"id":707239,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2026-07-17T21:00:10.000Z","date":"2026-07-15","kind":"exercise","planned":true,"acquired":false,"shares":38596,"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 March 13, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":293968,"derivative":{"exercise_price":5.8,"expiration_date":"2027-03-17","underlying":"Common Stock","underlying_shares":38596},"source":{"system":"sec-edgar","filing":"0001193125-26-307959","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526307959/ownership.xml","form_type":"4"}},{"id":707238,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-07-17T21:00:10.000Z","date":"2026-07-15","kind":"sale","planned":true,"acquired":false,"shares":38596,"price":20.35,"value":785428.6,"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 March 13, 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 $20.165 to $20.56, 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":403074,"source":{"system":"sec-edgar","filing":"0001193125-26-307959","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526307959/ownership.xml","form_type":"4"}},{"id":707237,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-07-17T21:00:10.000Z","date":"2026-07-15","kind":"exercise","planned":true,"acquired":true,"shares":38596,"price":5.8,"value":223856.8,"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 March 13, 2026."}],"balance_after":441670,"source":{"system":"sec-edgar","filing":"0001193125-26-307959","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526307959/ownership.xml","form_type":"4"}},{"id":709664,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22175,"kind":"person","name":"Caine Paul","position":1,"cik":"0001411765","reported_name":"Caine Paul","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-07-14T21:50:55.000Z","date":"2026-07-10","kind":"sale","planned":true,"acquired":false,"shares":5000,"price":20.64,"value":103200.0,"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 August 20, 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 $20.31 to $21.25, 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":162401,"source":{"system":"sec-edgar","filing":"0001193125-26-303451","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1411765/000119312526303451/ownership.xml","form_type":"4"}},{"id":711676,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-07-09T20:32:58.000Z","date":"2026-07-07","kind":"sale","planned":true,"acquired":false,"shares":1224,"price":21,"value":25704.0,"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 September 11, 2025."}],"balance_after":268485,"source":{"system":"sec-edgar","filing":"0001193125-26-299750","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000119312526299750/ownership.xml","form_type":"4"}},{"id":711875,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-07-09T20:27:32.000Z","date":"2026-07-07","kind":"sale","planned":true,"acquired":false,"shares":19233,"price":21.03,"value":404469.99,"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 September 10, 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 $21.00 to $21.16, 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":354281,"source":{"system":"sec-edgar","filing":"0001193125-26-299731","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000119312526299731/ownership.xml","form_type":"4"}},{"id":717193,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-07-02T23:07:34.000Z","date":"2026-07-01","kind":"sale","planned":true,"acquired":false,"shares":9376,"price":20,"value":187520.0,"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 September 11, 2025."}],"balance_after":269709,"source":{"system":"sec-edgar","filing":"0001193125-26-295113","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000119312526295113/ownership.xml","form_type":"4"}},{"id":721752,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2026-07-01T20:49:58.000Z","date":"2026-06-29","kind":"exercise","planned":true,"acquired":false,"shares":75000,"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 March 13, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":332564,"derivative":{"exercise_price":5.8,"expiration_date":"2027-03-17","underlying":"Common Stock","underlying_shares":75000},"source":{"system":"sec-edgar","filing":"0001193125-26-292738","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526292738/ownership.xml","form_type":"4"}},{"id":721751,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-07-01T20:49:58.000Z","date":"2026-06-29","kind":"sale","planned":true,"acquired":false,"shares":75000,"price":19.5,"value":1462500.0,"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 March 13, 2026."}],"balance_after":403074,"source":{"system":"sec-edgar","filing":"0001193125-26-292738","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526292738/ownership.xml","form_type":"4"}},{"id":721750,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-07-01T20:49:58.000Z","date":"2026-06-29","kind":"exercise","planned":true,"acquired":true,"shares":75000,"price":5.8,"value":435000.0,"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 March 13, 2026."}],"balance_after":478074,"source":{"system":"sec-edgar","filing":"0001193125-26-292738","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526292738/ownership.xml","form_type":"4"}},{"id":732254,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"See Remarks"}}],"security":"Common Stock","published_at":"2026-06-18T23:51:24.000Z","date":"2026-06-17","kind":"sale","planned":true,"acquired":false,"shares":19233,"price":19,"value":365427.0,"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 September 10, 2025."}],"balance_after":373514,"source":{"system":"sec-edgar","filing":"0001193125-26-276264","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000119312526276264/ownership.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. These shares were sold in multiple transactions at prices ranging from $18.00 to 18.25, 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":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":733413,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-06-17T22:45:17.000Z","date":"2026-06-17","kind":"sale","planned":true,"acquired":false,"shares":1409,"price":19,"value":26771.0,"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 September 11, 2025."}],"balance_after":279085,"source":{"system":"sec-edgar","filing":"0001193125-26-274503","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000119312526274503/ownership.xml","form_type":"4"}},{"id":733412,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-06-17T22:45:17.000Z","date":"2026-06-16","kind":"sale","planned":true,"acquired":false,"shares":11233,"price":18,"value":202194.0,"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 September 11, 2025."}],"balance_after":280494,"source":{"system":"sec-edgar","filing":"0001193125-26-274503","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000119312526274503/ownership.xml","form_type":"4"}},{"id":733411,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-06-17T22:45:17.000Z","date":"2026-06-15","kind":"sale","planned":true,"acquired":false,"shares":1057,"price":17,"value":17969.0,"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 September 11, 2025."}],"balance_after":291727,"source":{"system":"sec-edgar","filing":"0001193125-26-274503","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000119312526274503/ownership.xml","form_type":"4"}},{"id":734715,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2026-06-17T22:44:19.000Z","date":"2026-06-16","kind":"exercise","planned":true,"acquired":false,"shares":100000,"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 March 13, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":407564,"derivative":{"exercise_price":5.8,"expiration_date":"2027-03-17","underlying":"Common Stock","underlying_shares":100000},"source":{"system":"sec-edgar","filing":"0001193125-26-274501","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526274501/ownership.xml","form_type":"4"}},{"id":734714,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Employee Stock Option (Right to Buy)","published_at":"2026-06-17T22:44:19.000Z","date":"2026-06-15","kind":"exercise","planned":true,"acquired":false,"shares":178596,"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 March 13, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"Granted as compensation for services."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"The stock options have fully vested and are immediately exercisable."}],"balance_after":507564,"derivative":{"exercise_price":5.8,"expiration_date":"2027-03-17","underlying":"Common Stock","underlying_shares":178596},"source":{"system":"sec-edgar","filing":"0001193125-26-274501","document":"ownership.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526274501/ownership.xml","form_type":"4"}},{"id":734713,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-06-17T22:44:19.000Z","date":"2026-06-16","kind":"sale","planned":true,"acquired":false,"shares":100000,"price":17.5,"value":1750000.0,"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 March 13, 2026."}],"balance_after":403074,"source":{"system":"sec-edgar","filing":"0001193125-26-274501","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526274501/ownership.xml","form_type":"4"}},{"id":734712,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-06-17T22:44:19.000Z","date":"2026-06-16","kind":"exercise","planned":true,"acquired":true,"shares":100000,"price":5.8,"value":580000.0,"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 March 13, 2026."}],"balance_after":503074,"source":{"system":"sec-edgar","filing":"0001193125-26-274501","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526274501/ownership.xml","form_type":"4"}},{"id":734711,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-06-17T22:44:19.000Z","date":"2026-06-15","kind":"sale","planned":true,"acquired":false,"shares":178596,"price":16.59,"value":2962907.64,"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 March 13, 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 $15.945 to $16.93, 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":403074,"source":{"system":"sec-edgar","filing":"0001193125-26-274501","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526274501/ownership.xml","form_type":"4"}},{"id":734710,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-06-17T22:44:19.000Z","date":"2026-06-15","kind":"exercise","planned":true,"acquired":true,"shares":178596,"price":5.8,"value":1035856.8,"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 March 13, 2026."}],"balance_after":581670,"source":{"system":"sec-edgar","filing":"0001193125-26-274501","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000119312526274501/ownership.xml","form_type":"4"}},{"id":742983,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22175,"kind":"person","name":"Caine Paul","position":1,"cik":"0001411765","reported_name":"Caine Paul","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:58:47.000Z","date":"2026-06-08","kind":"grant","planned":false,"acquired":true,"shares":13798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest in full on the earliest of (i) June 8, 2027, (ii) the date of the 2027 annual meeting of the Issuer's stockholders, or (iii) a change of control of the Issuer."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Granted as compensation for services."}],"balance_after":167401,"source":{"system":"sec-edgar","filing":"0001193125-26-266380","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1411765/000119312526266380/ownership.xml","form_type":"4"}},{"id":742690,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39560,"kind":"person","name":"Yu Diane","position":1,"cik":"0001917981","reported_name":"Yu Diane","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:54:37.000Z","date":"2026-06-08","kind":"grant","planned":false,"acquired":true,"shares":13798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest in full on the earliest of (i) June 8, 2027, (ii) the date of the 2027 annual meeting of the Issuer's stockholders, or (iii) a change of control of the Issuer."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Granted as compensation for services."}],"balance_after":81279,"source":{"system":"sec-edgar","filing":"0001193125-26-266376","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000119312526266376/ownership.xml","form_type":"4"}},{"id":742689,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39559,"kind":"person","name":"Spillane Robert F","position":1,"cik":"0001603808","reported_name":"Spillane Robert F","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:54:31.000Z","date":"2026-06-08","kind":"grant","planned":false,"acquired":true,"shares":13798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest in full on the earliest of (i) June 8, 2027, (ii) the date of the 2027 annual meeting of the Issuer's stockholders, or (iii) a change of control of the Issuer."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Granted as compensation for services."}],"balance_after":57715,"source":{"system":"sec-edgar","filing":"0001193125-26-266375","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000119312526266375/ownership.xml","form_type":"4"}},{"id":742688,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":18648,"kind":"person","name":"Harden Sarah Patricia","position":1,"cik":"0001781873","reported_name":"Harden Sarah Patricia","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:50:42.000Z","date":"2026-06-08","kind":"grant","planned":false,"acquired":true,"shares":13798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest in full on the earliest of (i) June 8, 2027, (ii) the date of the 2027 annual meeting of the Issuer's stockholders, or (iii) a change of control of the Issuer."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Granted as compensation for services."}],"balance_after":163737,"source":{"system":"sec-edgar","filing":"0001193125-26-266371","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000119312526266371/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. These shares were sold in multiple transactions at prices ranging from $15.29 to $15.90, 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":163147,"source":{"system":"sec-edgar","filing":"0001193125-26-266370","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1350876/000119312526266370/ownership.xml","form_type":"4"}},{"id":742834,"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":"2026-06-08","kind":"grant","planned":true,"acquired":true,"shares":13798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest in full on the earliest of (i) June 8, 2027, (ii) the date of the 2027 annual meeting of the Issuer's stockholders, or (iii) a change of control of the Issuer."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Granted as compensation for services."}],"balance_after":173913,"source":{"system":"sec-edgar","filing":"0001193125-26-266370","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1350876/000119312526266370/ownership.xml","form_type":"4"}},{"id":742965,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39626,"kind":"person","name":"Rossman James","position":1,"cik":"0001296625","reported_name":"Rossman James","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:47:08.000Z","date":"2026-06-08","kind":"grant","planned":false,"acquired":true,"shares":13798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest in full on the earliest of (i) June 8, 2027, (ii) the date of the 2027 annual meeting of the Issuer's stockholders, or (iii) a change of control of the Issuer."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Granted as compensation for services."}],"balance_after":107477,"source":{"system":"sec-edgar","filing":"0001193125-26-266364","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1296625/000119312526266364/ownership.xml","form_type":"4"}},{"id":742725,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":24029,"kind":"person","name":"Lam Rachel","position":1,"cik":"0001579232","reported_name":"Lam Rachel","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:47:05.000Z","date":"2026-06-08","kind":"grant","planned":false,"acquired":true,"shares":13798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest in full on the earliest of (i) June 8, 2027, (ii) the date of the 2027 annual meeting of the Issuer's stockholders, or (iii) a change of control of the Issuer."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Granted as compensation for services."}],"balance_after":240620,"source":{"system":"sec-edgar","filing":"0001193125-26-266363","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1579232/000119312526266363/ownership.xml","form_type":"4"}},{"id":742727,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39571,"kind":"person","name":"PEARSON DAVID T.","position":1,"cik":"0001575492","reported_name":"PEARSON DAVID T.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:45:44.000Z","date":"2026-06-10","kind":"sale","planned":true,"acquired":false,"shares":10766,"price":15.65,"value":168487.9,"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 March 9, 2026."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.285 to $15.88, 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":79001,"source":{"system":"sec-edgar","filing":"0001193125-26-266358","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1575492/000119312526266358/ownership.xml","form_type":"4"}},{"id":742726,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39571,"kind":"person","name":"PEARSON DAVID T.","position":1,"cik":"0001575492","reported_name":"PEARSON DAVID T.","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-11T00:45:44.000Z","date":"2026-06-08","kind":"grant","planned":true,"acquired":true,"shares":13798,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents restricted stock units that vest in full on the earliest of (i) June 8, 2027, (ii) the date of the 2027 annual meeting of the Issuer's stockholders, or (iii) a change of control of the Issuer."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Granted as compensation for services."}],"balance_after":89767,"source":{"system":"sec-edgar","filing":"0001193125-26-266358","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1575492/000119312526266358/ownership.xml","form_type":"4"}},{"id":750862,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-06-03T20:45:07.000Z","date":"2026-06-01","kind":"sale","planned":true,"acquired":false,"shares":1409,"price":15,"value":21135.0,"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 September 11, 2025."}],"balance_after":292784,"source":{"system":"sec-edgar","filing":"0001966857-26-000006","document":"form4-06032026_040601.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000196685726000006/form4-06032026_040601.xml","form_type":"4"}},{"id":767473,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":39559,"kind":"person","name":"Spillane Robert F","position":1,"cik":"0001603808","reported_name":"Spillane Robert F","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-05-21T21:00:25.000Z","date":"2026-05-19","kind":"sale","planned":false,"acquired":false,"shares":10000,"price":13.33,"value":133300.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.32 to $13.355, 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."}],"balance_after":43917,"source":{"system":"sec-edgar","filing":"0001603808-26-000002","document":"form4-05212026_050519.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000160380826000002/form4-05212026_050519.xml","form_type":"4"}},{"id":772905,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-05-19T21:00:22.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":10404,"price":12.82,"value":133379.28,"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,316 shares acquired by the Reporting Person on May 15, 2026 under the Issuer's Employee Stock Purchase Plan."}],"balance_after":403074,"source":{"system":"sec-edgar","filing":"0001100612-26-000004","document":"form4-05192026_050509.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000110061226000004/form4-05192026_050509.xml","form_type":"4"}},{"id":772339,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Revenue"}}],"security":"Common Stock","published_at":"2026-05-19T21:00:19.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":12019,"price":12.82,"value":154083.58,"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 1,767 shares acquired by the Reporting Person on May 15, 2026 under the Issuer's Employee Stock Purchase Plan."}],"balance_after":392747,"source":{"system":"sec-edgar","filing":"0001865116-26-000004","document":"form4-05192026_050507.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000004/form4-05192026_050507.xml","form_type":"4"}},{"id":771374,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22090,"kind":"person","name":"Day David","position":1,"cik":"0001523288","reported_name":"Day David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-05-19T21:00:16.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":14170,"price":12.82,"value":181659.4,"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":493289,"source":{"system":"sec-edgar","filing":"0001523288-26-000005","document":"form4-05192026_050513.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1523288/000152328826000005/form4-05192026_050513.xml","form_type":"4"}},{"id":771275,"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":"2026-05-19T21:00:16.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":11204,"price":12.82,"value":143635.28,"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":496840,"source":{"system":"sec-edgar","filing":"0001700262-26-000004","document":"form4-05192026_050506.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000004/form4-05192026_050506.xml","form_type":"4"}},{"id":773701,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22587,"kind":"person","name":"Saltz Aaron","position":1,"cik":"0001807986","reported_name":"Saltz Aaron","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF LEGAL OFFICER"}}],"security":"Common Stock","published_at":"2026-05-19T21:00:15.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":5627,"price":12.82,"value":72138.14,"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":270016,"source":{"system":"sec-edgar","filing":"0001807986-26-000004","document":"form4-05192026_050511.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1807986/000180798626000004/form4-05192026_050511.xml","form_type":"4"}},{"id":771274,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22051,"kind":"person","name":"Gephart Brian","position":1,"cik":"0001778484","reported_name":"Gephart Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF ACCOUNTING OFFICER"}}],"security":"Common Stock","published_at":"2026-05-19T21:00:15.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":3789,"price":12.82,"value":48574.98,"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":118596,"source":{"system":"sec-edgar","filing":"0001778484-26-000003","document":"form4-05192026_050504.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000177848426000003/form4-05192026_050504.xml","form_type":"4"}},{"id":771272,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-05-19T21:00:13.000Z","date":"2026-05-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":8335,"price":12.82,"value":106854.7,"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."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 433 shares acquired by the Reporting Person on May 15, 2026 under the Issuer's Employee Stock Purchase Plan."}],"balance_after":294193,"source":{"system":"sec-edgar","filing":"0001966857-26-000005","document":"form4-05192026_050501.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000196685726000005/form4-05192026_050501.xml","form_type":"4"}},{"id":895819,"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":"2026-02-18T21:55:01.000Z","date":"2026-02-18","kind":"sale","planned":true,"acquired":false,"shares":21529,"price":12,"value":258348.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F2","text":"These sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 18, 2025."}],"balance_after":388425,"source":{"system":"sec-edgar","filing":"0001725125-26-000003","document":"form4-02182026_090258.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512526000003/form4-02182026_090258.xml","form_type":"4"}},{"id":895818,"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":"2026-02-18T21:55:01.000Z","date":"2026-02-15","kind":"tax_withholding","planned":true,"acquired":false,"shares":18933,"price":11.7,"value":221516.1,"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":409954,"source":{"system":"sec-edgar","filing":"0001725125-26-000003","document":"form4-02182026_090258.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000172512526000003/form4-02182026_090258.xml","form_type":"4"}},{"id":895816,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":2050,"kind":"person","name":"Buonasera David","position":1,"cik":"0001966857","reported_name":"Buonasera David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF TECHNOLOGY OFFICER"}}],"security":"Common Stock","published_at":"2026-02-18T21:30:27.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":17137,"price":11.7,"value":200502.9,"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":302095,"source":{"system":"sec-edgar","filing":"0001966857-26-000004","document":"form4-02182026_040222.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000196685726000004/form4-02182026_040222.xml","form_type":"4"}},{"id":897750,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22425,"kind":"person","name":"BARRETT MICHAEL G.","position":1,"cik":"0001100612","reported_name":"BARRETT MICHAEL G.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CEO"}}],"security":"Common Stock","published_at":"2026-02-18T21:30:25.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":23549,"price":11.7,"value":275523.3,"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":412162,"source":{"system":"sec-edgar","filing":"0001100612-26-000003","document":"form4-02182026_040214.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1100612/000110061226000003/form4-02182026_040214.xml","form_type":"4"}},{"id":895815,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22051,"kind":"person","name":"Gephart Brian","position":1,"cik":"0001778484","reported_name":"Gephart Brian","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF ACCOUNTING OFFICER"}}],"security":"Common Stock","published_at":"2026-02-18T21:30:24.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":6149,"price":11.7,"value":71943.3,"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":122385,"source":{"system":"sec-edgar","filing":"0001778484-26-000002","document":"form4-02182026_040220.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000177848426000002/form4-02182026_040220.xml","form_type":"4"}},{"id":895925,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22090,"kind":"person","name":"Day David","position":1,"cik":"0001523288","reported_name":"Day David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-02-18T21:30:21.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":30617,"price":11.7,"value":358218.9,"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":507459,"source":{"system":"sec-edgar","filing":"0001523288-26-000004","document":"form4-02182026_040212.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1523288/000152328826000004/form4-02182026_040212.xml","form_type":"4"}},{"id":895814,"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":"2026-02-18T21:30:21.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":27428,"price":11.7,"value":320907.6,"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":508044,"source":{"system":"sec-edgar","filing":"0001700262-26-000003","document":"form4-02182026_040218.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1595974/000170026226000003/form4-02182026_040218.xml","form_type":"4"}},{"id":899050,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22587,"kind":"person","name":"Saltz Aaron","position":1,"cik":"0001807986","reported_name":"Saltz Aaron","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF LEGAL OFFICER"}}],"security":"Common Stock","published_at":"2026-02-18T21:30:19.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":12761,"price":11.7,"value":149303.7,"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":275643,"source":{"system":"sec-edgar","filing":"0001807986-26-000003","document":"form4-02182026_040216.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1807986/000180798626000003/form4-02182026_040216.xml","form_type":"4"}},{"id":897172,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22298,"kind":"person","name":"Buckley Sean Patrick","position":1,"cik":"0001865116","reported_name":"Buckley Sean Patrick","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President, Revenue"}}],"security":"Common Stock","published_at":"2026-02-18T21:30:17.000Z","date":"2026-02-15","kind":"tax_withholding","planned":false,"acquired":false,"shares":26942,"price":11.7,"value":315221.4,"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":402999,"source":{"system":"sec-edgar","filing":"0001865116-26-000003","document":"form4-02182026_040210.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1865116/000186511626000003/form4-02182026_040210.xml","form_type":"4"}},{"id":940779,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22090,"kind":"person","name":"Day David","position":1,"cik":"0001523288","reported_name":"Day David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Performance Stock Units","published_at":"2026-01-12T21:30:21.000Z","date":"2026-01-09","kind":"exercise","planned":false,"acquired":false,"shares":72675,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"Each PSU represents a contingent right to receive, on vesting, one share of the Issuer's common stock, subject to Issuer performance as more specifically described in Footnote 4 herein."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan."},{"field":"derivative.exercise_date","element":"exerciseDate","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 72,675 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 72,675 shares."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":72675},"source":{"system":"sec-edgar","filing":"0001523288-26-000002","document":"form4-01122026_040107.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1523288/000152328826000002/form4-01122026_040107.xml","form_type":"4"}},{"id":940778,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22090,"kind":"person","name":"Day David","position":1,"cik":"0001523288","reported_name":"Day David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-01-12T21:30:21.000Z","date":"2026-01-09","kind":"tax_withholding","planned":false,"acquired":false,"shares":35169,"price":16.17,"value":568682.73,"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":538076,"source":{"system":"sec-edgar","filing":"0001523288-26-000002","document":"form4-01122026_040107.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1523288/000152328826000002/form4-01122026_040107.xml","form_type":"4"}},{"id":940777,"issuer":{"id":2049,"kind":"organization","name":"MAGNITE, INC.","symbol":"MGNI"},"owners":[{"id":22090,"kind":"person","name":"Day David","position":1,"cik":"0001523288","reported_name":"Day David","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHIEF FINANCIAL OFFICER"}}],"security":"Common Stock","published_at":"2026-01-12T21:30:21.000Z","date":"2026-01-09","kind":"exercise","planned":false,"acquired":true,"shares":72675,"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":573245,"source":{"system":"sec-edgar","filing":"0001523288-26-000002","document":"form4-01122026_040107.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1523288/000152328826000002/form4-01122026_040107.xml","form_type":"4"}}],"next_cursor":"2026-01-12T21:30:21.000000Z,940777"}