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. filings document the regulatory record of an operating ad technology company focused on sell-side programmatic advertising. Form 8-K reports furnish quarterly and annual results, including revenue, contribution ex-TAC, CTV and DV+ metrics, adjusted EBITDA, cash flow measures, outlook commentary and stock buyback disclosures.
The company’s proxy materials cover annual meeting matters, director elections, executive compensation and stockholder voting procedures. Other filings document executive transitions, material agreements, Regulation FD disclosures and risk-factor updates, including litigation and competitive risks tied to the digital advertising ecosystem.
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.
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.