Form 4 for MGNI MAGNITE, INC.
Accepted 2026-08-07 17:14:08 ET · period of report 2026-08-06 · accession 0001865116-26-000007 · 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 | 2026-08-07 17:14 | 2026-08-06 | MGNI | Buckley Sean Patrick | See Remarks | M - OptEx | $13.90 | +28.7K | 383.0K | +8% | +$399.0K |
| DMT | 2026-08-07 17:14 | 2026-08-06 | MGNI | Buckley Sean Patrick | See Remarks | S - Sale+OE | $24.49 | -67.2K | 315.8K | -18% | -$1.65M |
| DT | 2026-08-07 17:14 | 2026-08-06 | MGNI | Buckley Sean Patrick | See Remarks | M - OptEx | $0.00 | -28.7K | 57.4K | -33% | $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 | 2026-08-06 | M | A | 28,703 | $13.90 | 382,984 | D | — | — | (F1) The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025. |
| 2 | Common | Common Stock | 2026-08-06 | S | D | 47,942 | $25.09 | 335,042 | D | — | — | (F1) The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025. |
| 3 | Common | Common Stock | 2026-08-06 | S | D | 19,237 | $23.00 | 315,805 | D | — | — | (F1) The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025. |
| 4 | Derivative | Stock Option (right to buy) | 2026-08-06 | M | D | 28,703 | $0.00 | 57,405 | D | $13.90 · — to 2032-02-01 | 28,703 Common Stock | (F1) The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025. (F3) Granted as compensation for services. (F2) The stock options have fully vested and are immediately exercisable. |