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. officer Sean Patrick Buckley reported an open-market sale of 19,233 shares of Common Stock at $19.00 per share. After this transaction, he directly holds 373,514 shares, indicating he retains a substantial equity position. The filing notes the sale was executed under a pre-arranged Rule 10b5-1 trading plan adopted on September 10, 2025, suggesting the trade was scheduled in advance rather than timed opportunistically.
MAGNITE, INC. director Douglas S. Knopper reported an open-market sale of 37,337 shares of common stock on June 16, 2026 at a weighted average price of $18.10 per share, with individual trade prices ranging from $18.00 to $18.25.
The transaction was executed under a pre-arranged Rule 10b5-1 trading plan adopted on December 12, 2025. Following this sale, Knopper directly holds 125,810 shares of Magnite common stock.
MAGNITE, INC. Chief Technology Officer David Buonasera reported open-market sales of company Common Stock over three consecutive days. He sold 1,057 shares at $17.00, 11,233 shares at $18.00, and 1,409 shares at $19.00, totaling 13,699 shares.
Following these transactions, Buonasera directly holds 279,085 shares of Magnite common stock. The filing notes that the reported transactions were executed under a pre-arranged Rule 10b5-1 trading plan adopted on September 11, 2025, indicating they were scheduled in advance rather than timed discretionarily.
Magnite, Inc. CEO Michael G. Barrett exercised stock options and sold shares in paired transactions disclosed on this Form 4. On June 15, 2026, he exercised options to acquire 178,596 shares of common stock at a $5.80 exercise price and sold 178,596 shares in open‑market transactions at a weighted average price of $16.59, with individual trades ranging from $15.945 to $16.93. On June 16, 2026, he exercised options to acquire an additional 100,000 shares at $5.80 and sold 100,000 shares at $17.50 per share. The filing reports that these exercises and subsequent sales were made pursuant to a pre‑arranged Rule 10b5‑1 trading plan adopted on March 13, 2026. Following the transactions, Barrett directly holds 403,074 shares of Magnite common stock, with the reported options fully vested and immediately exercisable before their stated expiration date of March 17, 2027.
Adam L. Soroca reported proposed and recent sales of common stock via a Form 144. The filing lists multiple completed sales in May–June 2026, including specific transactions such as 06/16/2026 — 6,000 shares for $108,000.00 and other dated disposals. The document also lists restricted shares vested under a registered plan on 05/15/2022, 02/15/2023, and 05/15/2023.
MGNI proposes the sale of Common restricted securities under a Form 144 notice by an affiliated broker-dealer. The filing lists recent transactions by David Buonasera on 06/01/2026, 06/15/2026, and 06/16/2026 with share quantities recorded for each date.
Douglas Knopper reported a sale of 10,766 shares under a pre-arranged 10b5-1 plan. The filing shows the sale occurred on 06/10/2026 with aggregate proceeds of $169,391.17. The filing also lists 37,337 Restricted Stock Units dated 06/28/2021 associated with the issuer.
Morgan Stanley Smith Barney LLC submitted a Form 144-style filing listing Common restricted stock dated 02/15/2025 identified as "Securities To Be Sold" by the ISSUER. The excerpt also lists two recorded sales by David Buonasera: 1,057 shares on 06/15/2026 and 1,409 shares on 06/01/2026.
Affiliate files a Rule 144 notice to sell 100,000 shares. The filing records a stock option exercise transaction scheduled for 06/16/2026 through Morgan Stanley Smith Barney LLC and indicates cash settlement. The excerpt also shows a prior sale of 178,596 shares on 06/15/2026 for $2,962,061.65.