Cover Page
Cover Page - USD ($) $ in Millions | 12 Months Ended | ||
Dec. 31, 2020 | Feb. 19, 2021 | Jun. 30, 2020 | |
Cover [Abstract] | |||
Document Type | 10-K/A | ||
Document Annual Report | true | ||
Document Period End Date | Dec. 31, 2020 | ||
Current Fiscal Year End Date | --12-31 | ||
Document Transition Report | false | ||
Entity File Number | 001-36384 | ||
Entity Registrant Name | MAGNITE, INC. | ||
Entity Incorporation, State or Country Code | DE | ||
Entity Tax Identification Number | 20-8881738 | ||
Entity Address, Address Line One | 6080 Center Drive, | ||
Entity Address, Address Line Two | 4th Floor | ||
Entity Address, City or Town | Los Angeles, | ||
Entity Address, State or Province | CA | ||
Entity Address, Postal Zip Code | 90045 | ||
City Area Code | 310 | ||
Local Phone Number | 207-0272 | ||
Title of 12(b) Security | Common stock, par value $0.00001 per share | ||
Trading Symbol | MGNI | ||
Security Exchange Name | NASDAQ | ||
Entity Well-known Seasoned Issuer | No | ||
Entity Voluntary Filers | No | ||
Entity Current Reporting Status | Yes | ||
Entity Interactive Data Current | Yes | ||
Entity Filer Category | Accelerated Filer | ||
Entity Small Business | false | ||
Entity Emerging Growth Company | false | ||
ICFR Auditor Attestation Flag | true | ||
Entity Shell Company | false | ||
Entity Public Float | $ 646.3 | ||
Entity Common Stock, Shares Outstanding | 115,570,100 | ||
Documents Incorporated by Reference | None. | ||
Entity Central Index Key | 0001595974 | ||
Amendment Flag | true | ||
Amendment Description | EXPLANATORY NOTE On February 25, 2021, Magnite, Inc. (the “Company”) filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “Original Form 10-K”). This Amendment No. 1 (the “Amendment”) amends Part III, Items 10 through 14 of the Original Form 10-K to include information previously omitted from the Original Form 10-K in reliance on General Instruction G(3) to Form 10-K. As a result of an administrative calendar oversight, the Company did not file a proxy statement involving the election of directors or an amendment to the Original Form 10-K before April 30, 2021, as required by the instructions. Accordingly, Part III of the Original Form 10-K is hereby amended as set forth below. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), new certifications by our principal executive officer and principal financial officer are filed as exhibits to this Amendment under Item 15 of Part IV hereof, which has been restated in its entirety. Except as stated herein, this Amendment does not reflect events occurring after the filing of the Original Form 10-K with the Securities and Exchange Commission on February 25, 2021 and no attempt has been made in this Amendment to modify or update other disclosures as presented in the Original Form 10-K. | ||
Document Fiscal Year Focus | 2020 | ||
Document Fiscal Period Focus | FY |