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.
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.
Katie Seitz Evans, President, Operations at Magnite, Inc. (MGNI), reported a non-discretionary sale of company stock on 08/18/2025. She disposed of 10,487 shares of common stock at $23.85 per share as part of a "sell to cover" to satisfy tax withholding obligations from the settlement of vested restricted stock units. After the transaction she beneficially owned 423,943 shares.
The filing notes the sale was mandated by the issuer's election to require withholding via sale and was not a discretionary trade by the reporting person. The Form 4 was signed on behalf of the reporting person by an attorney-in-fact.
Magnite insider sale to cover taxes. Aaron Saltz, Chief Legal Officer of Magnite, sold 5,770 shares of common stock on 08/18/2025 at $23.85 per share to satisfy tax withholding obligations associated with vested restricted stock units. The sale was a company-mandated "sell-to-cover" and not a discretionary trade by the reporting person. After the transaction, Saltz beneficially owns 242,184 shares, held directly. The Form 4 discloses routine compliance with tax withholding related to equity compensation and provides transparent reporting of the officer's post-transaction ownership.
Magnite, Inc. director and CEO Michael G. Barrett reported a non-discretionary sale of 35,951 shares of common stock on 08/18/2025 at a price of $23.85 per share. The filing states the shares were sold to satisfy the reporting person’s tax withholding obligations arising from the settlement of vested Restricted Stock Units; the sale was mandated by the issuer’s sell-to-cover election and not a discretionary trade. After the transaction, the reporting person beneficially owned 249,857 shares, held directly. The Form 4 was signed by an attorney-in-fact on 08/20/2025.
Magnite insider sales by President, Revenue Sean Patrick Buckley reported two non-derivative sales of Common Stock: 10,886 shares sold on 08/18/2025 at a weighted average price of $23.85 and 9,315 shares sold on 08/19/2025 at a weighted average price of $23.42, leaving the reporting person with 336,508 and then 327,193 shares beneficially owned after each transaction respectively. The filing states the first sale was to satisfy tax withholding on vested restricted stock units and was not discretionary. The second sale was executed under a Rule 10b5-1 trading plan adopted on November 24, 2023. The filer signed by attorney-in-fact.
Magnite insider sale to cover taxes from vested RSUs. David Buonasera, Chief Technology Officer, reported a sale of 7,834 shares of Magnite, Inc. (MGNI) on 08/18/2025 at a price of $23.85 per share. The filing states the sale was executed to satisfy tax-withholding obligations arising from the settlement of vested Restricted Stock Units and was mandated by the issuer's sell-to-cover election rather than a discretionary decision by the reporting person. After the transaction Buonasera beneficially owned 241,579 shares, held directly. The Form 4 was signed by attorney-in-fact Aaron Saltz on 08/20/2025.