Form 4 for MGNI MAGNITE, INC.
Accepted 2026-09-10 16:39:28 ET · period of report 2026-09-08 · accession 0001700262-26-000011 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DT | 2026-09-10 16:39 | 2026-09-08 | MGNI | Evans Katie Seitz | See Remarks | M - OptEx | $5.16 | +13.5K | 499.2K | +3% | +$69.9K |
| DMT | 2026-09-10 16:39 | 2026-09-08+ | MGNI | Evans Katie Seitz | See Remarks | S - Sale+OE | $23.59 | -43.4K | 455.8K | -9% | -$1.02M |
| DT | 2026-09-10 16:39 | 2026-09-08 | MGNI | Evans Katie Seitz | See Remarks | M - OptEx | $0.00 | -13.5K | 0 | -100% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-09-08 | M | A | 13,546 | $5.16 | 499,182 | D | — | — | (F1) The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026. |
| 2 | Common | Common Stock | 2026-09-08 | S | D | 32,285 | $23.63 | 466,897 | D | — | — | (F1) The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026. (F2) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.465 to $23.91, 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. |
| 3 | Common | Common Stock | 2026-09-09 | S | D | 11,100 | $23.46 | 455,797 | D | — | — | (F1) The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026. (F3) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.095 to $24.00, 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. |
| 4 | Derivative | Employee Stock Option (Right to Buy) | 2026-09-08 | M | D | 13,546 | $0.00 | 0 | D | $5.16 · — to 2029-02-27 | 13,546 Common Stock | (F1) The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026. (F5) Granted as compensation for services. (F4) The stock options have fully vested and are immediately exercisable. (F6) The amount reported in Column 9 reflects a correction to the number of derivative securities beneficially owned directly by the Reporting Person. A prior report inadvertently understated the number of derivative securities beneficially owned directly by the Reporting Person by 13,546 shares due to an administrative error. This correction does not reflect any purchase, sale or other transaction by the Reporting Person. |