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 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.
MAGNITE, INC. (MGNI) disclosed that Chief Accounting Officer Brian Gephart had 3,789 shares of common stock withheld on 2026-08-15 under a non-discretionary arrangement mandated by the company to cover tax withholding obligations arising from the vesting of restricted stock units. The shares were valued at $24.73 per share for this purpose, and Gephart now holds 102,328 shares of Magnite common stock directly.
MAGNITE, INC. (MGNI) reported that CEO and director Michael G. Barrett had 10,404 shares of common stock withheld on 2026-08-15 at $24.73 per share. According to the company’s arrangement, these shares were non-discretionarily forfeited to cover tax withholding obligations on vesting restricted stock units, leaving Barrett with 392,670 directly held shares afterward.
MAGNITE, INC. (MGNI) reported an insider equity-related transaction by its Chief Financial Officer, David Day. On 2026-08-15, 14,170 shares of common stock were forfeited at $24.73 per share to satisfy tax withholding obligations tied to the vesting of restricted stock units, under a non-discretionary arrangement mandated by the company. After this tax-withholding disposition, Day directly holds 452,861 shares of MAGNITE common stock.
MAGNITE, INC. (MGNI) director Paul Caine reported selling 7,500 shares of common stock on August 14, 2026, at $25.00 per share in an open-market or private transaction. The sale was effected pursuant to a Rule 10b5-1 trading plan adopted on August 20, 2025, and Caine now directly holds 149,901 shares.
MAGNITE, INC. (MGNI) reported insider transactions by Sean Patrick Buckley, President, Revenue & Market Strategy. On August 18, 2026, he sold 2,759 shares of common stock at $25.00 per share, and on August 17, 2026, he sold 8,271 shares at a weighted average price of $24.31 per share. On August 15, 2026, 11,715 shares were disposed of to satisfy tax withholding obligations related to vesting of restricted stock units. The sales on August 17 and 18 were effected pursuant to a Rule 10b5-1 trading plan adopted on September 10, 2025.
Magnite, Inc. (MGNI) reports a planned sale of 8,271 shares of common stock through Morgan Stanley Smith Barney LLC Executive Financial Services, with trading indicated for NASDAQ. The shares to be sold relate to Restricted Stock Units dated August 15, 2026. Over the past three months, Sean Buckley has reported 10b5-1 plan sales of MGNI common stock, including 67,179 shares on August 6, 2026, 19,233 shares on July 7, 2026, and 19,233 shares on June 17, 2026, for stated gross proceeds in each case.
Paul J Caine has filed to sell up to 2,500 shares of MGNI common stock through Morgan Stanley Smith Barney LLC, with an indicated value of $61,450.00. These shares relate to Restricted Stock Units granted on 06/01/2016. The filing also lists prior Rule 10b5-1 sales of 5,000 shares for $121,740.00 on 08/10/2026 and 5,000 shares for $103,185.00 on 07/10/2026.