MAGNITE (MGNI) Director Douglas Knopper Sells 37,337 Shares

What Happened
Douglas S. Knopper, a director of MAGNITE, INC. (MGNI), sold 37,337 shares in an open-market transaction on September 17, 2026. The weighted-average price reported was $26.28 per share, producing proceeds of approximately $981,216. The filing characterizes the transaction as a sale (code S).

Key Details

• Transaction date: 2026-09-17; filing date: 2026-09-18 (no late filing indicated).
• Price: weighted average $26.28; shares were sold in multiple trades at prices ranging from $26.00 to $26.50.
• Shares sold: 37,337; reported proceeds ≈ $981,216.
• Shares owned after transaction: not disclosed in the provided filing excerpt.
• Footnotes: sale was executed pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 12, 2025. The filer will provide a breakdown of the number of shares sold at each price in the stated range upon request (per the Form 4 footnote).

Context
Sales by insiders are often routine and may be pre-scheduled; this transaction was made under a pre-established 10b5-1 plan, which typically schedules trades in advance and can reduce the implication of opportunistic timing. For retail investors, purchases generally carry more signal than routine sales; this filing alone does not indicate management sentiment beyond the existence of a prearranged selling plan.