InsiderTrades

Form 4 for MGNI MAGNITE, INC.

Accepted 2026-05-19 17:00:13 ET · period of report 2026-05-15 · accession 0001966857-26-000005 · 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
2026-05-19 17:00 2026-05-15 MGNI Buonasera David CTO F - Tax $12.82 -8,335 294.2K -3% -$106.9K

Purchase Sale Sale after option exercise All abbreviations

Every reported transaction

#TableSecurityDateCodeA/DSharesPriceOwned afterOwnExercise / expiryUnderlyingFootnotes
1 Common Common Stock 2026-05-15 F D 8,335 $12.82 294,193 D — — (F1) Represents 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. (F2) Includes 433 shares acquired by the Reporting Person on May 15, 2026 under the Issuer's Employee Stock Purchase Plan.