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.
Form 144 filed for Magnite, Inc. (MGNI) shows a proposed sale of 21,509 common shares through Morgan Stanley Smith Barney with an aggregate market value of $548,952.70, to be sold approximately on 08/27/2025 on NASDAQ. The filing discloses prior restricted stock acquisitions dated 02/14/2022, 04/01/2022 and 02/14/2023 totaling 21,509 shares acquired from the issuer and paid in full on acquisition dates. The filing also lists sales by Katheryn Evans totaling 98,327 common shares during June–August 2025 with gross proceeds disclosed per trade.
Magnite, Inc. (MGNI) director Diane Yu reported the sale of 20,000 shares on 08/26/2025 at a weighted average price of $25.23, reducing her direct holdings to 67,481 shares. The Form 4 shows the sale was executed in multiple transactions with prices ranging from $25.18 to $25.265 and discloses that the filer will provide transaction-level details on request.
The filing is a routine Section 16 disclosure of a director sale; it was signed by an attorney-in-fact on 08/27/2025. No derivative transactions or other changes in beneficial ownership are reported in this Form 4.
Magnite, Inc. (MGNI) director Paul Caine sold 7,500 shares of common stock on 08/25/2025 at $25.00 per share under a Rule 10b5-1 trading plan adopted on 08/15/2024. After the reported sale, the filing shows Mr. Caine beneficially owns 171,103 shares, reported in a Form 4 filed as an individual reporting person. The transaction is coded S(1) indicating a sale pursuant to a pre-established trading arrangement. The Form 4 was executed by attorney-in-fact Aaron Saltz on 08/26/2025.
Magnite, Inc. (MGNI) insider sale disclosed on Form 4. The reporting person, Katie Seitz Evans (President, Operations), sold 8,345 shares of common stock on 08/25/2025 at $26 per share under a Rule 10b5-1 trading plan that was adopted on March 6, 2025. After the sale she beneficially owned 415,598 shares, reported as direct ownership. The Form 4 was signed by attorney-in-fact Aaron Saltz on 08/26/2025. The filing documents a planned disposition under an established trading plan rather than an ad hoc transaction.
Magnite, Inc. (MGNI) insider intends to sell 20,000 shares on NASDAQ through Morgan Stanley Smith Barney LLC, representing an aggregate market value of $504,616. The shares to be sold are a small fraction of the company's reported outstanding shares of 142,399,305, so the transaction size is modest relative to the company.
The securities were originally acquired as restricted stock: 13,743 shares on 06/12/2024 and 6,257 shares on 06/07/2023, with payment dates matching acquisition dates. No other sales by the reporting person in the past three months are reported, and the filer certifies no undisclosed material adverse information.
Magnite, Inc. (MGNI) reported a proposed sale of 12,500 common shares to be executed through Morgan Stanley Smith Barney on 08/25/2025, with an aggregate market value of $302,000. The shares were originally acquired as restricted stock units on 06/01/2018. The filing lists total outstanding shares of 142,399,305, indicating the proposed sale represents a very small fraction of the company.
The filing also discloses recent 10b5-1 plan sales by the same person totaling 15,000 shares in the past three months, generating gross proceeds of $329,064. The filer affirms no undisclosed material adverse information and references reliance on a trading plan where applicable.
Form 144 notice for Magnite, Inc. (MGNI): This filing reports a proposed sale of 8,345 common shares valued at $216,970.00, to be sold on 08/25/2025 on NASDAQ through Morgan Stanley Smith Barney LLC. The shares were acquired as restricted stock from the issuer on 04/01/2021. The filer previously sold common shares this year: 10,487 shares on 08/18/2025 for $250,149.56, 24,495 shares on 06/30/2025 for $571,164.00, 20,000 shares on 06/16/2025 for $370,000.00, and 35,000 shares on 06/05/2025 for $607,695.50. The filer certifies no undisclosed material adverse information.
Magnite insider sale to cover taxes: Chief Accounting Officer Brian Gephart reported a non-discretionary sale of 2,961 shares of Magnite, Inc. (MGNI) on 08/18/2025 at $23.85 per share to satisfy tax withholding tied to the settlement of vested Restricted Stock Units. After the transaction, the reporting person beneficially owned 120,569 shares, held directly. The filing states the sale was mandated by the issuer's sell-to-cover election and was not a discretionary trade by the reporting person. The Form 4 was executed by an attorney-in-fact and contains no derivative transactions or other purchases.
Day David, reported as Chief Financial Officer of Magnite, Inc. (MGNI), sold 13,366 shares of common stock on 08/18/2025 at a price of $23.85 per share. The filing states the sale was executed to satisfy the reporting persons tax withholding obligation arising from the settlement of vested Restricted Stock Units and was a mandatory "sell to cover" transaction elected by the issuer. After the sale, the reporting person beneficially owns 382,106 shares, held directly.
Adam Lee Soroca, Chief Product Officer of Magnite, Inc. (MGNI), reported two non-discretionary sales of company common stock on 08/18/2025 and 08/19/2025. On 08/18/2025 he sold 9,700 shares at $23.85 per share to satisfy tax withholding from vested restricted stock units. On 08/19/2025 he sold 10,579 shares at a weighted average price of $23.47 pursuant to a Rule 10b5-1 trading plan adopted on March 7, 2025. The filings show beneficial ownership of 356,972 shares after the 08/18 sale and 346,393 shares after the 08/19 sale. The Form 4 was signed via attorney-in-fact on 08/20/2025.
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