Magnite (MGNI) President Katie Seitz Sells 13,997 Shares

What Happened

• Katie Seitz, President, Product & Operations at Magnite, sold 13,997 shares of MGNI on September 11, 2026. The shares were sold at $24.00 each for total gross proceeds of $335,928. The filing reports the transaction as an open-market sale (Form 4 code S).

Key Details

• Transaction date: 2026-09-11
• Price per share: $24.00; Shares sold: 13,997; Total value: $335,928
• Reported as an open-market sale (S)
• Footnote: Transaction executed under a Rule 10b5-1 trading plan adopted June 8, 2026
• Shares owned after the transaction: not disclosed in the provided excerpt
• Filing date / Period of report: 2026-09-11 — no late filing indicated in the excerpt

Context

• A sale under a pre-established Rule 10b5-1 plan typically means the trades were scheduled in advance and do not necessarily reflect the insider’s current view of the company. Sales are often routine for diversification or liquidity reasons; they are less commonly treated as a bullish signal than purchases.