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. executive Katie Seitz Evans, President, Product & Operations, exercised employee stock options for 20,000 shares of common stock at an exercise price of $5.1600 per share on August 6, 2026, then sold 20,000 shares at $24.0000 per share. The options were fully vested, granted as compensation, and the exercise and sale were made under a Rule 10b5-1 trading plan adopted on August 28, 2025.
Magnite, Inc. CEO Michael G. Barrett exercised stock options covering 293,968 shares of common stock at an exercise price of $5.80 per share and sold the same number of shares at $22.72 per share on August 6, 2026. The options were granted as compensation, were fully vested and immediately exercisable, and were due to expire on March 17, 2027. The exercise and subsequent sale were carried out under a Rule 10b5-1 trading plan adopted on March 13, 2026.
Sean Buckley, a shareholder of MGNI, filed a notice to potentially sell common stock through Morgan Stanley Smith Barney LLC. The planned sales include 28,703 shares to be issued upon the exercise of stock options dated 08/06/2026 and 38,476 shares from RSU & PSA awards dated 11/15/2023. The filing also reports prior Rule 10b5-1 plan sales of 19,233 shares of common stock on both 06/17/2026 and 07/07/2026, for proceeds of $365,427.00 and $404,553.78, respectively.
Magnite, Inc. insider Douglas Knopper filed to potentially sell shares of the company’s common stock. The notice lists 19,128 shares of common stock associated with restricted stock units granted on 06/07/2022 and indicates use of Morgan Stanley Smith Barney LLC Executive Financial Services as broker. It also reports prior Rule 10b5-1 plan sales of common stock, including 37,337 shares for $675,799.70 on 06/16/2026 and 10,766 shares for $169,391.17 on 06/10/2026.
A Form 144 filing related to MGNI reports a proposed sale of up to 18,209 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with a notation date of 08/06/2026. The securities derive from Restricted Stock Units originally dated 11/06/2019. The filing also lists prior Rule 10b5-1 sales for Douglas Knopper over the past three months, totaling 37,337 shares for $675,799.70 on 06/16/2026 and 10,766 shares for $169,391.17 on 06/10/2026.
David Buonasera filed to sell 7,649 shares of common stock of MGNI through Morgan Stanley Smith Barney LLC Executive Financial Services, with an indicated value of $179,459.56. These shares were acquired as restricted stock from the issuer on 08/15/2024. In the past three months, Buonasera has already sold multiple common share blocks, including 9,376 shares for $187,520.00 on 07/01/2026 and 11,233 shares for $202,194.00 on 06/16/2026, along with several smaller transactions.
Magnite, Inc. (MGNI) has a notice from Michael G. Barrett covering a proposed sale of up to 293,968 shares of common stock, to be effected through Morgan Stanley Smith Barney LLC’s Executive Financial Services, following a stock option exercise, with a proposed sale date of August 6, 2026 on NASDAQ.
The filing also lists prior sales in the last three months: 38,596 shares for $785,509.65 on July 15, 2026; 75,000 shares for $1,462,500.00 on June 29, 2026; 100,000 shares for $1,750,000.00 on June 16, 2026; and 178,596 shares for $2,962,061.65 on June 15, 2026.
FMR LLC reported beneficial ownership of 7,759,425.80 shares of MAGNITE INC common stock, representing 5.4% of the class, as of June 30, 2026. FMR LLC reports sole dispositive power over all 7,759,425.80 shares and sole voting power over 7,755,677.00 shares, with no shared voting or dispositive power.
Abigail P. Johnson is separately reported with sole dispositive power over the same 7,759,425.80 shares and no voting or shared powers. One or more other persons have rights to dividends or sale proceeds from these shares, but no such person holds more than five percent of MAGNITE INC’s outstanding common stock.