Buckley Sean Patrick 4

What Happened

• Sean Patrick Buckley, President, Revenue & Market Strategy at Magnite (MGNI), sold 19,233 shares on July 7, 2026. The weighted-average price was $21.03 per share, for total proceeds of about $404,470. The shares were sold in multiple trades at prices ranging from $21.00 to $21.16.
• This was a sale (S) executed under a pre-established Rule 10b5-1 trading plan adopted September 10, 2025, which generally indicates the trades were scheduled in advance rather than triggered by immediate company developments.

Key Details

• Transaction date: 2026-07-07 (Period of Report); Form 4 filed: 2026-07-09.
• Price: weighted average $21.03; per-trade range $21.00–$21.16. Reporting person can supply a breakdown of shares sold at each price on request (per footnote).
• Shares sold: 19,233; proceeds: ~$404,470.
• Shares owned after transaction: not disclosed in the excerpt provided in this summary.
• Notable footnotes: F1 — sale effected under a Rule 10b5-1 plan (adopted 2025-09-10). F2 — weighted-average price reported; multiple execution prices within stated range.
• Filing timeliness: Form filed two days after the reported trade date (filed 2026-07-09 for 2026-07-07 trade).

Context

• Sales by executives are common and can reflect pre-planned diversification, tax planning, or other personal reasons; they do not necessarily signal a change in company fundamentals. A 10b5-1 plan means the trades were set up in advance, which reduces the likelihood the sale was based on nonpublic information.
• For investors, purchases are typically more informative than routine sales; treat this as a scheduled insider sale unless additional disclosures indicate otherwise.