SEC Form 4 · accession 0001865116-26-000009
MAGNITE, INC. · MGNI
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Sean Patrick Buckley
Officer — See Remarks
Period of report
Aug 15, 2026
Accepted (ET)
Aug 18, 2026 · 4:14 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001595974
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common Stock | Aug 15, 2026 | F | 11,715 | $24.73 | D | 304,090 | D | |
| Common StockF3 | Aug 17, 2026 | S | 8,271 | $24.31 | D | 295,819 | D | |
| Common Stock | Aug 18, 2026 | S | 2,759 | $25.00 | D | 293,060 | D |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1Represents the non-discretionary forfeiture of shares on behalf of the Reporting Person pursuant to an arrangement mandated by the Issuer to cover the tax withholding obligations associated with the vesting of restricted stock units.
- F2The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025.
- F3The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.05 to $24.55, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4.
Remarks
President, Revenue & Market Strategy