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) reported that its Chief Technology Officer, David Buonasera, sold a total of 6,414 shares of common stock in two open market or private transactions under a Rule 10b5-1 trading plan. The sales occurred on September 1, 2026 and September 2, 2026 at prices of $23.42 and $25.00 per share, respectively.
MAGNITE, INC. (MGNI) is the issuer for a Rule 144 notice filed by officer David Buonasera, covering a proposed sale of 1,043 shares of common stock through Morgan Stanley Smith Barney LLC, with an aggregate market value of $26,075.00 and 143,424,157 shares outstanding as of the planned sale date of September 2, 2026. The shares were acquired as restricted stock from the issuer on August 15, 2025. The filing also lists prior open-market sales by Buonasera over the past three months, including several transactions in June, July, August, and September 2026 with individual trade sizes ranging from 1,057 to 11,233 shares.
MAGNITE, INC. (MGNI) received a Rule 144 notice that officer David Buonasera may sell up to 5,371 shares of common stock through Morgan Stanley Smith Barney LLC on or after 09/01/2026. The shares are restricted stock acquired from the issuer on 08/15/2025, and prior sales over the last three months are also listed.
MAGNITE, INC. (MGNI) director Sarah Patricia Harden reported two open-market sales of common stock under a Rule 10b5-1 trading plan adopted on May 27, 2026. She sold 18,436 shares on August 28, 2026 at $24.00 per share and 30,550 shares on August 26, 2026 at a weighted average price of $23.31 per share, with the latter sale executed in multiple trades at prices ranging from $23.09 to $23.52 per share.
Magnite, Inc. (MGNI) is the issuer for which director Sarah Patricia Harden filed a Form 144, giving notice of a proposed sale of restricted common stock under Rule 144. The notice covers 18,436 shares of common stock with an aggregate market value of $442,464.00, to be sold through Morgan Stanley Smith Barney LLC on NASDAQ around 08/28/2026. Magnite reports 143,424,157 shares of common stock outstanding; this is a baseline figure, not the amount being sold. The filing also lists a separate sale during the past three months of 30,550 shares of common stock on 08/26/2026 for $712,166.86.
Magnite, Inc. (MGNI) is the issuer of common stock covered by a notice filed under Rule 144 by director Sarah Patricia Harden. The notice indicates a proposed sale of 30,550 shares of Magnite common stock through Morgan Stanley Smith Barney LLC, with an aggregate market value of $712,166.86. The filing cites total common shares outstanding of 143,424,157 and references underlying restricted stock awards dated June 7, 2023 (16,489 shares) and June 5, 2025 (14,061 shares).
MAGNITE, INC. (MGNI) reported that Chief Technology Officer David Buonasera had 8,102 shares of common stock withheld on August 15, 2026 at $24.73 per share. The shares were a non-discretionary forfeiture to cover tax withholding obligations tied to vesting restricted stock units, leaving him with 252,734 shares held directly.
MAGNITE, INC. (MGNI) reported an insider tax-related share disposition by officer Katie Seitz Evans, President, Product & Operations. On 2026-08-15, 11,204 shares of common stock were forfeited on a non-discretionary basis to cover tax withholding obligations tied to vesting restricted stock units. Following this withholding transaction, Evans directly holds 485,636 shares of Magnite common stock.
MAGNITE, INC. (MGNI) received a notice that officer Sean Buckley intends to sell common stock under Rule 144. The notice covers 2,759 shares of common stock, to be sold through Morgan Stanley Smith Barney LLC, with a reported transaction value of $66,740.21.
The shares derive from restricted stock units, with the planned sale date reported as August 18, 2026 and trading on NASDAQ. Over the prior three months, the notice lists additional Rule 10b5-1 sales by Sean Buckley totaling several tranches of common stock with reported transaction values in the hundreds of thousands of dollars.
MAGNITE, INC. (MGNI) reported that Chief Legal Officer Aaron Salt had 5,627 shares of common stock withheld on 2026-08-15 at $24.73 per share. The shares were non-discretionarily forfeited to cover tax withholding obligations arising from the vesting of restricted stock units, pursuant to an arrangement mandated by the company. After this tax-withholding disposition, Salt directly holds 264,389 shares of MAGNITE common stock.