Buckley Sean Patrick 4

What Happened

• Sean Patrick Buckley, President, Revenue at Magnite (MGNI), had 26,942 shares forfeited/disposed on Feb 15, 2026 to satisfy tax withholding obligations tied to vested restricted stock units (RSUs). The shares were valued at $11.70 each, totaling $315,221. This was an issuer‑mandated, non‑discretionary withholding (not an open‑market sale).

Key Details

• Transaction date: 2026-02-15; filing date: 2026-02-18 (timely).
• Shares forfeited: 26,942 at $11.70 per share; aggregate value $315,221.
• Transaction code: F (tax withholding). Footnote: non‑discretionary forfeiture by the issuer to cover tax withholding on RSU vesting.
• Shares owned after the transaction: not specified in the filing.
• This is an administrative sell‑to‑cover for tax purposes, not a discretionary insider sale.

Context

• Withholding shares upon RSU vesting is a common practice to meet tax obligations and does not necessarily indicate the insider’s view of the stock. It differs from a voluntary open‑market sale or a new purchase.