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.
Brian Gephart, Chief Accounting Officer of Magnite, Inc. (MGNI), reported the sale of 27,671 shares of common stock on 09/04/2025. The sales were made pursuant to a Rule 10b5-1 trading plan adopted on 06/05/2025. The weighted-average price for the shares sold was reported as $24.71, with individual trade prices ranging from $24.26 to $24.94. After the reported disposition, the filing shows 92,898 shares beneficially owned by the reporting person. The Form 4 was signed by an attorney-in-fact on 09/05/2025.
Magnite, Inc. entered into a First Amendment to its Sublease with Zillow Group, Inc. that is expected to be effective as of November 1, 2025. The amendment expands the leased premises to add the entire 8th floor; prior to the amendment the leased premises consisted of the entire 9th floor. The company states the description in the notice is not complete and is qualified in its entirety by the full First Amendment, which will be filed as an exhibit to Magnite's Quarterly Report for the quarter ended September 30, 2025. No other terms, financial commitments, or lease costs are disclosed in this notice.
Magnite, Inc. (MGNI) officer sale disclosed on Form 4. Chief Technology Officer David Buonasera reported a sale of 2,950 shares of Magnite common stock on 09/03/2025 at a price of $25.37 per share, leaving him with 238,629 shares beneficially owned following the transaction. The filing states the sale was executed pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 15, 2024. The form was signed by attorney-in-fact Aaron Saltz on 09/04/2025.
Magnite insider exercise and sales under 10b5-1 plan. Adam Lee Soroca, Chief Product Officer, exercised 24,986 vested employee stock options at a $4.92 exercise price on 09/02/2025 and immediately sold those shares in multiple transactions. He sold 9,269 shares at a weighted average price of $24.22 (range $23.74–$24.66) and 15,717 shares at a weighted average price of $24.97 (range $24.78–$25.05), executing the trades pursuant to a Rule 10b5-1 plan adopted May 28, 2025. After these transactions his beneficial ownership decreased from 371,379 to 346,393 shares. The options exercised were fully vested and the underlying shares were granted as compensation.
Magnite, Inc. (MGNI) filing a Form 144 notifies the market that 27,671 shares of common stock held by the selling person will be offered for sale through Morgan Stanley Smith Barney LLC on 09/04/2025 on NASDAQ. The filing reports an aggregate market value of $683,849.80 based on the planned sale and notes total shares outstanding of 142,399,305. The shares were acquired as restricted stock from the issuer on 08/15/2022. The filer also reported a recent sale of 2,961 shares on 08/18/2025 for $70,629.62. The notice includes the standard representation that the seller is not aware of any undisclosed material adverse information.
Form 144 filed for Magnite, Inc. (MGNI) discloses a proposed sale of 2,950 restricted common shares acquired from the issuer on 08/15/2024. The seller lists a broker as Morgan Stanley Smith Barney LLC and values the proposed sale at $74,841.50 with an approximate sale date of 09/03/2025 on NASDAQ. The filing also reports recent sales by the same person: 7,834 shares sold on 08/18/2025 for $186,866.75 and 9,289 shares sold on 06/30/2025 for $204,358.00. The filing shows 142,399,305 shares outstanding and includes the seller's declaration regarding absence of undisclosed material information.
Insider sale notice: This Form 144 by an issuer of record for Magnite, Inc. (MGNI) reports a proposed sale of 24,986 common shares through Morgan Stanley Smith Barney LLC on 09/02/2025 with an aggregate market value of $616,884.51. The filer reports those shares were acquired the same day, 09/02/2025, via stock option exercise and paid for in cash. The filing also discloses recent open-market dispositions by Adam L. Soroca totaling 116,710 shares sold across five transactions between 06/06/2025 and 08/19/2025, generating gross proceeds shown per trade. The notice includes the required attestation that the seller is not aware of undisclosed material adverse information.
Aaron Saltz, Chief Legal Officer of Magnite, Inc. (MGNI), reported a sale of 12,403 shares of Magnite common stock on 08/29/2025 at a reported price of $26.07 per share, reducing his direct beneficial ownership to 229,781 shares. The filing is a Form 4 statement of changes in beneficial ownership and is signed by Mr. Saltz.
Magnite, Inc. (MGNI) reporting person Katie Seitz Evans, President, Operations, reported an insider sale. On 08/27/2025 Ms. Evans disposed of 21,509 shares of Magnite common stock at a weighted average price of $25.52 per share (sales occurred at prices ranging from $25.52 to $25.58). After the transaction she beneficially owned 394,089 shares. The Form 4 was filed as a single reporting person form and signed by an attorney-in-fact, Aaron Saltz, on 08/29/2025. The filer offered to provide the breakdown of shares sold at each price on request.
Magnite, Inc. (MGNI) Form 144 summary: This notice reports a proposed sale under Rule 144 of 12,403 common shares through Morgan Stanley Smith Barney, with an aggregate market value of $323,399.54. The shares were originally acquired as restricted stock on 02/14/2021 from the issuer and were fully paid on that date. The filer (identified in prior transactions as Aaron Saltz) has disclosed multiple recent open-market sales during June–August 2025 totaling 69,325 shares with gross proceeds shown for each trade. The filing includes the standard representation that the seller is not aware of undisclosed material adverse information about the issuer.
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