Magnite (MGNI) CTO David Buonasera Sells 1,165 Shares

What Happened
David Buonasera, Chief Technology Officer of Magnite, sold 1,165 shares of MGNI stock on September 14, 2026, at $24.00 per share for total proceeds of $27,960. This was a disposition (sale) rather than a purchase.

Key Details

• Transaction date: 2026-09-14; Price: $24.00 per share; Shares sold: 1,165; Total value: $27,960.
• Transaction type: Open-market sale (code S).
• Filing date (Form 4): 2026-09-16 — filed within the typical 2-business-day window (timely).
• Footnote: Trade was executed pursuant to a Rule 10b5-1 trading plan adopted by Mr. Buonasera on June 13, 2026.
• Shares owned after the transaction: Not specified in the information provided in this summary.

Context
Sales executed under a Rule 10b5-1 plan are pre-arranged and often routine, so they do not necessarily signal a change in the insider’s view of the company. For retail investors, purchases typically carry more informational weight than routine sales; this single transaction is relatively small in value.