Magnite (MGNI) CTO David Buonasera Sells 7,649 Shares

What Happened
David Buonasera, Chief Technology Officer of Magnite, sold a total of 7,649 shares of MGNI on August 6, 2026. The sales were executed in three open-market transactions: 4,176 shares at an average of $22.81 ($95,255), 2,602 shares at $24.00 ($62,448), and 871 shares at $25.00 ($21,775), for aggregate proceeds of approximately $179,478. These were sales (S) — routine disposition of shares rather than purchases.

Key Details

• Transaction date: August 6, 2026; Form 4 filed August 7, 2026 (filed the next day).
• Prices and quantities: 4,176 @ $22.81; 2,602 @ $24.00; 871 @ $25.00. Total shares sold = 7,649; total proceeds ≈ $179,478.
• Footnotes: F1 — trades were made pursuant to a Rule 10b5-1 trading plan adopted September 11, 2025. F2 — one reported price is a weighted average; some shares were sold in multiple transactions at prices ranging $22.72–$23.00 and the filer can provide a breakdown on request.
• Shares owned after the transactions: not disclosed in the provided filing excerpt.

Context
A Rule 10b5-1 plan indicates these sales were prearranged and scheduled, which is common for insiders who want a pre-set mechanism to sell shares and reduces the implication that the sales reflect new, company-specific information. For retail investors, purchases are often more informative of insider sentiment; routine sales under a 10b5-1 plan are typically considered less indicative of a change in outlook.