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.
MGNI filing (Form 144): The filing lists proposed and recent sales of Common Stock tied to restricted stock vesting events under a registered plan and shows two reported sales by Adam L. Soroca. The filing itemizes multiple vesting dates and share counts and records sales of 18,225 shares on 05/27/2026 and 18,451 shares on 05/18/2026, with dollar amounts shown alongside each sale.
Adam L. Soroca filed a Form 144 notifying a proposed sale of 18,225 shares of Common Stock, described as restricted stock vesting under a registered plan on 01/09/2026. The filing also lists a prior sale of 18,451 shares on 05/18/2026 and monetary figures of $250,477.11 and $247,975.90 in the excerpt.
MAGNITE, INC. director Robert F. Spillane reported an open-market sale of 10,000 shares of common stock on May 19, 2026 at a weighted average price of $13.33 per share. After this transaction, he directly owns 43,917 common shares.
The filing notes that the shares were sold in multiple trades at prices ranging from $13.32 to $13.355 per share, with full trade-by-trade details available upon request to the company, its security holders, or the SEC staff.
MAGNITE, INC. CEO Michael G. Barrett reported a routine tax-related share forfeiture. On May 15, 2026, 10,404 shares of common stock were disposed of at an indicated value of $12.82 per share to satisfy tax withholding obligations tied to vesting restricted stock units.
The filing notes this was a non-discretionary forfeiture mandated by the company’s arrangement, not an open-market sale. After this transaction, Barrett directly holds 403,074 shares of Magnite common stock, which includes 1,316 shares acquired the same day under the company’s Employee Stock Purchase Plan.
MAGNITE, INC. President, Revenue Sean Patrick Buckley reported a routine share disposition related to tax withholding. On the vesting of restricted stock units, 12,019 shares of common stock were forfeited at a value of $12.82 per share to satisfy tax obligations under a mandatory arrangement. After this non-discretionary forfeiture, Buckley directly holds 392,747 shares, which include 1,767 shares acquired on May 15, 2026 under the company’s Employee Stock Purchase Plan.
Magnite, Inc.’s chief financial officer David Day reported a routine share disposition tied to taxes, not an open-market trade. On the vesting of restricted stock units, 14,170 shares of common stock were automatically forfeited at a value of $12.82 per share to cover tax withholding obligations mandated by the company. After this non-discretionary tax-withholding event, Day directly holds 493,289 shares of Magnite common stock.
Magnite, Inc. President of Operations Katie Seitz Evans reported a routine tax-related share disposition. On May 15, 2026, 11,204 shares of common stock were forfeited at $12.82 per share to cover tax withholding obligations tied to vesting restricted stock units. After this non-discretionary forfeiture, she directly holds 496,840 shares of Magnite common stock.
Magnite, Inc.’s chief legal officer, Aaron Saltz, reported a non-discretionary forfeiture of 5,627 shares of common stock on May 15, 2026. These shares were withheld at $12.82 per share to cover tax obligations tied to vesting restricted stock units. After this tax-withholding disposition, he directly holds 270,016 shares of Magnite common stock.
MAGNITE, INC. chief accounting officer Brian Gephart reported a routine share disposition tied to taxes. On the vesting of restricted stock units, 3,789 shares of common stock were forfeited at an indicated value of $12.82 per share to cover mandated tax withholding obligations. This non-discretionary forfeiture was executed under an arrangement required by the company, rather than as an open-market sale. Following the transaction, Gephart directly holds 118,596 shares of Magnite common stock.
Magnite, Inc. chief technology officer David Buonasera had 8,335 common shares withheld at $12.82 per share to cover tax obligations from vesting restricted stock units. After this non-discretionary forfeiture, he directly holds 294,193 shares, which include 433 shares acquired under the company’s Employee Stock Purchase Plan.