Welcome to our dedicated page for Magnite SEC filings (Ticker: MGNI), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
Magnite, Inc. (NASDAQ: MGNI) files a range of reports and disclosures with the U.S. Securities and Exchange Commission, providing investors with detailed information about its operations as an independent sell-side advertising company. This page aggregates Magnite’s SEC filings and pairs them with AI-powered tools to help readers interpret complex regulatory documents.
Magnite’s recent Form 8-K filings illustrate how the company communicates material events. For example, it has furnished press releases announcing financial results for quarters ended June 30 and September 30, 2025 under Item 2.02, and it has disclosed the filing of a lawsuit against Google LLC under Item 7.01, along with related risk factor updates under Item 8.01. Another 8-K describes a material definitive agreement amending a sublease to expand leased premises.
Through this page, users can quickly access Magnite’s current reports on Form 8-K, as well as its periodic reports such as annual reports on Form 10-K and quarterly reports on Form 10-Q, which are referenced in its forward-looking statements and risk factor discussions. These filings provide insight into Magnite’s financial condition, non-GAAP metrics like Contribution ex-TAC and Adjusted EBITDA as described in its earnings materials, and the risks it associates with its business and litigation.
AI-powered summaries highlight key points from lengthy filings, helping readers understand sections on results of operations, risk factors, material agreements, and legal proceedings without reading every page. Real-time updates ensure that new filings from EDGAR appear promptly, while dedicated views make it easier to review items such as executive commentary in earnings releases or disclosures related to Magnite’s relationship with major partners like Google. This page is a central resource for analyzing MGNI’s regulatory history and ongoing reporting obligations.
The Vanguard Group filed an amended Schedule 13G reporting ownership of 14,654,432 shares of Magnite Inc. common stock, equal to 10.29% of the class. Vanguard reports 0 shares of sole voting power and 972,050 shares of shared voting power, with 13,506,122 shares of sole dispositive power and 1,148,310 shares of shared dispositive power. The filing states these securities are held in the ordinary course of business and not for the purpose of changing or influencing control.
Paul Caine, a director of Magnite, Inc. (MGNI), reported a sale of common stock under a pre-established Rule 10b5-1 plan. On 09/19/2025 the reporting person sold 7,500 shares at $25 per share, reducing his beneficial ownership to 158,603 shares. The filing indicates the trades were executed pursuant to a 10b5-1 trading plan adopted on August 15, 2024, and the Form 4 was signed by an attorney-in-fact on behalf of the reporting person.
Insider sale notice for Magnite, Inc. (MGNI). This Form 144 reports a proposed sale of 7,500 common shares to be executed through Morgan Stanley Smith Barney LLC on 09/19/2025 with an aggregate market value of $179,100. The shares were acquired as restricted stock units on 06/01/2018. The filing notes 142,399,305 shares outstanding for the class. The filer discloses multiple prior 10b5-1 plan sales in the past three months totaling 27,500 shares and gross proceeds shown for each trade. The notice includes the standard representation that the seller is unaware of undisclosed material adverse information.
A MagNite insider, Chief Legal Officer Aaron Saltz, sold 8,522 shares of MAGNITE, INC. (MGNI) on 09/19/2025 at $24.50 per share, reducing his direct holdings to 215,079 shares. The filing states the sale was executed under a Rule 10b5-1 trading plan adopted by the reporting person on March 14, 2025, indicating the transactions were preplanned. No additional derivative transactions or amendments are reported.
Form 144 notice for Magnite, Inc. (MGNI) reports a proposed sale of 8,522 common shares held by Aaron Saltz to be effected on 09/19/2025 through Morgan Stanley Smith Barney LLC on NASDAQ. The shares were acquired as restricted stock from the issuer on 02/15/2023. The filing lists the aggregate market value of the proposed sale as $208,789.00 and notes 142,399,305 shares outstanding for the class. The notice also discloses recent open-market sales by the same person during the past three months on multiple dates with individual gross proceeds shown. The filing includes the standard Rule 144 certification that the seller is not aware of any undisclosed material adverse information.
Insider sale disclosed: Aaron Saltz, Chief Legal Officer of Magnite, Inc. (MGNI), reported a sale of 6,180 shares of common stock on 09/15/2025 at a price of $23.94 per share. After the sale, Mr. Saltz beneficially owned 223,601 shares, held directly. The filing states the sale was executed under a Rule 10b5-1 trading plan adopted March 14, 2025.
Magnite, Inc. has filed a lawsuit against Google LLC seeking financial damages and other remedies after a U.S. District Court found Google engaged in unlawful anticompetitive practices in certain ad tech markets. The company warns this litigation is in early stages, carries uncertain timing and outcome, and could be costly and protracted. Magnite notes Google is a major participant, partner and competitor whose actions could materially affect Magnite's revenue and relationships with publishers and advertisers. The company also updates its risk factors to disclose possible retaliatory actions by Google, diversion of management attention and potential reputational harm.
Magnite, Inc. (MGNI) insider sale disclosure: The Form 4 filed for Sean Patrick Buckley, President, Revenue, reports two open-market sales totaling 40,000 shares on 09/08/2025 and 09/09/2025. The first sale on 09/08/2025 disposed of 20,000 shares at a weighted-average price of $25.56 and the second on 09/09/2025 disposed of 20,000 shares at a weighted-average price of $24.61. Following these transactions, Mr. Buckley beneficially owns 287,193 shares, down from 307,193 prior to the second sale.
The filing includes footnotes clarifying that each reported price is a weighted average of multiple trades within specified ranges and offers to provide detailed per-trade quantities on request. The Form 4 was signed by an attorney-in-fact on 09/10/2025. No derivative transactions or other changes in beneficial ownership are reported in this filing.
Insider sale notice for Magnite, Inc. (MGNI): This Form 144 reports a proposed sale of 20,000 common shares through Morgan Stanley Smith Barney with an aggregate market value of $492,148.00, with an approximate sale date of 09/09/2025 on NASDAQ. The filing lists recent acquisitions of the shares: purchases via the Employee Stock Purchase Plan on 05/15/2025 and prior ESPP and restricted stock vesting dates between 2023 and 2025. The filer also disclosed sales earlier in September and August 2025 totaling 40,201 shares with gross proceeds shown. The notice includes the signer’s representation of no undisclosed material adverse information.
Insider sale notice for Magnite, Inc. (MGNI). The filing shows a proposed sale of 20,000 common shares through Morgan Stanley Smith Barney with an aggregate market value of $511,214, scheduled approximately on 09/08/2025 on NASDAQ. The filer reports acquiring 14,853 shares on 02/15/2025 and 5,147 shares on 08/15/2025 via restricted stock vesting as compensation. During the past three months the same person sold 10,886 shares on 08/18/2025 for $259,667.02 and 9,315 shares on 08/19/2025 for $218,152.18. The signer certifies they are not aware of any undisclosed material adverse information about the issuer.
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