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.
Adam L. Soroca reports a proposed sale of 21,529 shares of Common stock, consisting of Restricted Stock to be sold through Morgan Stanley Smith Barney LLC on 02/15/2026. The filing also discloses 16,656 shares sold on 12/17/2025 as sales during the past three months.
Magnite, Inc.’s Chief Technology Officer David Buonasera reported a non-discretionary share forfeiture related to equity compensation. On February 15, 2026, 17,137 shares of common stock were surrendered at $11.70 per share to cover tax withholding obligations from vesting restricted stock units. This was a mandated arrangement by the company, not an open-market sale. After this tax-withholding disposition, Buonasera beneficially owned 302,095 shares of Magnite common stock.
Magnite, Inc. CEO Michael G. Barrett reported a tax-related share disposition. On the vesting of restricted stock units, 23,549 shares of common stock were non-discretionarily forfeited at $11.70 per share to cover withholding taxes. After this tax-withholding transaction, he directly holds 412,162 common shares.
Magnite, Inc. Chief Accounting Officer Brian Gephart reported a tax-related share transaction involving company common stock. On the reported date, 6,149 shares were forfeited at $11.70 per share to satisfy withholding taxes tied to the vesting of restricted stock units, under a non-discretionary arrangement mandated by Magnite. Following this tax-withholding disposition, Gephart’s directly held stake stands at 122,385 common shares.
MAGNITE, INC. President, Operations Katie Seitz Evans reported a non-discretionary forfeiture of 27,428 shares of common stock at $11.70 per share. The shares were withheld by the company to cover tax obligations arising from the vesting of restricted stock units. After this tax-withholding disposition, she holds 508,044 shares directly.
MAGNITE, INC. Chief Financial Officer David Day reported a tax-related share disposition. On February 15, 2026, 30,617 shares of common stock were forfeited at $11.70 per share to cover withholding taxes on vesting restricted stock units, a non-discretionary transaction, leaving him with 507,459 shares directly owned.
MAGNITE, INC. chief legal officer Aaron Salt reported a tax-withholding disposition of 12,761 shares of common stock. These shares were non-discretionarily forfeited to the company at $11.70 per share to cover tax obligations arising from the vesting of restricted stock units, rather than being sold on the open market. After this withholding event, Salt directly holds 275,643 shares of Magnite common stock.
MAGNITE, INC. President, Revenue Sean Patrick Buckley reported a disposition of 26,942 shares of common stock at $11.70 per share. The shares were non-discretionarily forfeited to cover tax withholding obligations tied to vested restricted stock units. After this tax-withholding disposition, Buckley directly held 402,999 common shares.
Capital Research Global Investors filed a Schedule 13G showing a passive ownership stake in Magnite, Inc. common stock. It reports beneficial ownership of 12,920,289 shares, representing 9.0% of the class, based on 143,647,869 shares believed outstanding as of 12/31/2025. Capital Research Global Investors has sole voting and dispositive power over all reported shares and certifies the position is held in the ordinary course of business, not to change or influence control of Magnite.
Wellington Management Group and related entities have disclosed a significant ownership position in Magnite, Inc. common stock. They report beneficial ownership of 8,629,238 shares held across clients of several Wellington investment advisers.
The Wellington entities report no sole voting or dispositive power over these shares, only shared authority. One adviser, Wellington Management Company LLP, reports shared voting power over 5,142,349 shares and shared dispositive power over 7,417,178 shares, reflecting its role managing assets for underlying clients rather than owning the shares directly.