Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| MAGNITE, INC.MGNI · Entity 2049 | See Remarks | August 15, 2026 | August 18, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
MAGNITE, INC.
Report date August 15, 2026 · Filed August 18, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common StockSEC Table I · non-derivative | Direct | 293,060 |
Ending reported balance
After 2026-08-18 transaction · row 3
3 source rows · reconciled sequenceRow 1 · 2026-08-15 · Tax withholding · Disposed 11,715 · Balance 304,090 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. Row 2 · 2026-08-17 · Sale · Disposed 8,271 · Balance 295,819 F2: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025. F3: The 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. Row 3 · 2026-08-18 · Sale · Disposed 2,759 · Balance 293,060 F2: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025. |
Filing footnotes · ownership attribution and instrument terms
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: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 10, 2025.
F3: The 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.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| February 15, 2023 Filed Feb 17, 2023 21:37 UTC | MAGNITE, INC. MGNI · Entity 2049 | Tax withholdingCommon Stock | 15,401 | $13.27 | $204,371.27 |
DisclosureSEC source: 0001209191-23-010667 · doc4.xml · nonDerivative · entry 1 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 336,205 F1 · kind: 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. Read SEC document |
| January 01, 2023 Filed Jan 5, 2023 00:23 UTC | MAGNITE, INC. MGNI · Entity 2049 | GrantPerformance Stock Units · Derivative | 50,752 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-23-001410 · doc4.xml · derivative · entry 2 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 50,752 Underlying: Common Stock · 50,752 shares Expires not disclosed F3 · derivative.exercise_price: Each performance stock unit ("PSU") represents a contingent right to receive on vesting one share of the Issuer's common stock. F2 · price: Equity grant under the Company's 2014 Equity Incentive Plan. F4 · derivative.exercise_date: Vesting of the PSU will be determined based on the Issuer's total stockholder return ("TSR") for the three-year period beginning on the grant date of the award relative to the TSRs of the companies in the Russell 2000 index over that period. The number of PSUs reported in column 5 reflects the target number of PSUs subject to the award. The award is eligible to vest as to 0% to 150% of the target number of PSUs. F4 · derivative.expiration_date: Vesting of the PSU will be determined based on the Issuer's total stockholder return ("TSR") for the three-year period beginning on the grant date of the award relative to the TSRs of the companies in the Russell 2000 index over that period. The number of PSUs reported in column 5 reflects the target number of PSUs subject to the award. The award is eligible to vest as to 0% to 150% of the target number of PSUs. Read SEC document |
| January 01, 2023 Filed Jan 5, 2023 00:23 UTC | MAGNITE, INC. MGNI · Entity 2049 | GrantCommon Stock | 142,276 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-23-001410 · doc4.xml · nonDerivative · entry 1 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 351,606 F1 · shares: Represents restricted stock units that vest as follows: 38,533 on February 15, 2024, 8,892 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2026 and 5,931 on February 15, 2027, subject to continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances. F2 · price: Equity grant under the Company's 2014 Equity Incentive Plan. Read SEC document |
| November 15, 2022 Filed Nov 18, 2022 02:05 UTC | MAGNITE, INC. MGNI · Entity 2049 | Tax withholdingCommon Stock | 1,632 | $11.47 | $18,719.04 |
DisclosureSEC source: 0001209191-22-057753 · doc4.xml · nonDerivative · entry 1 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 209,330 F1 · kind: 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. Read SEC document |
| August 15, 2022 Filed Aug 17, 2022 20:23 UTC | MAGNITE, INC. MGNI · Entity 2049 | Tax withholdingCommon Stock | 1,632 | $9.80 | $15,993.60 |
DisclosureSEC source: 0001209191-22-046259 · doc4.xml · nonDerivative · entry 1 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 210,962 F1 · kind: 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. Read SEC document |
| June 01, 2022 Filed Jun 3, 2022 20:17 UTC | MAGNITE, INC. MGNI · Entity 2049 | Tax withholdingCommon Stock | 11,185 | $10.70 | $119,679.50 |
DisclosureSEC source: 0001209191-22-034035 · doc4.xml · nonDerivative · entry 1 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 212,594 F1 · kind: 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. Read SEC document |
| May 15, 2022 Filed May 17, 2022 21:42 UTC | MAGNITE, INC. MGNI · Entity 2049 | Tax withholdingCommon Stock | 6,525 | $10.59 | $69,099.75 |
DisclosureSEC source: 0001209191-22-029787 · doc4.xml · nonDerivative · entry 1 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 223,779 F1 · kind: 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. Read SEC document |
| February 01, 2022 Filed Feb 4, 2022 00:23 UTC | MAGNITE, INC. MGNI · Entity 2049 | GrantStock Option (Right to Buy) · Derivative | 86,108 | $0.00 Strike: $13.90 | $0.00 |
DisclosureSEC source: 0001209191-22-007015 · doc4.xml · derivative · entry 2 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer, CTV 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 86,108 Underlying: Common Stock · 86,108 shares Expires 2032-02-01 F2 · price: Equity grant under the Issuer's 2014 Equity Incentive Plan. F3 · derivative.exercise_date: 25% of the total number of shares underlying the option will vest on February 1, 2023 and the remaining shares vest 1/36 per month over the next 36 months thereafter, subject to the Reporting Person's continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances. Read SEC document |
| February 01, 2022 Filed Feb 4, 2022 00:23 UTC | MAGNITE, INC. MGNI · Entity 2049 | GrantCommon Stock | 121,024 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-22-007015 · doc4.xml · nonDerivative · entry 1 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer, CTV 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 230,304 F1 · shares: Represents restricted stock units (the "RSUs") that vest as follows: 25% of the total number of shares underlying the RSU will vest on February 15, 2023 and the remaining shares vest in 12 equal quarterly installments on the 15th of every May, August, November and February thereafter, subject to continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances. F2 · price: Equity grant under the Issuer's 2014 Equity Incentive Plan. Read SEC document |
| June 01, 2021 Filed Jun 3, 2021 21:31 UTC | MAGNITE, INC. MGNI · Entity 2049 | GrantStock Option (Right to Buy) · Derivative | 43,788 | $0.00 Strike: $30.93 | $0.00 |
DisclosureSEC source: 0001209191-21-037794 · doc4.xml · derivative · entry 3 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer, CTV 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 43,788 Underlying: Common Stock · 43,788 shares Expires 2031-06-01 F2 · price: Equity grant under the Issuer's 2014 Equity Incentive Plan. F4 · derivative.exercise_date: 25% of the total number of shares underlying the option will vest on May 15, 2022 and the remaining shares vest 1/36 per month over the next 36 months thereafter, subject to the Reporting Person's continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances. Read SEC document |
| June 01, 2021 Filed Jun 3, 2021 21:31 UTC | MAGNITE, INC. MGNI · Entity 2049 | GrantCommon Stock | 50,437 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-21-037794 · doc4.xml · nonDerivative · entry 2 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer, CTV 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 109,280 F3 · shares: Represents restricted stock units that vest as follows: one-half on June 1, 2022 and one-half on June 1, 2023, subject to the Reporting Person's continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances. F2 · price: Equity grant under the Issuer's 2014 Equity Incentive Plan. Read SEC document |
| June 01, 2021 Filed Jun 3, 2021 21:31 UTC | MAGNITE, INC. MGNI · Entity 2049 | GrantCommon Stock | 58,843 | $0.00 | $0.00 |
DisclosureSEC source: 0001209191-21-037794 · doc4.xml · nonDerivative · entry 1 Buckley Sean Patrick · CIK 0001865116 · Chief Revenue Officer, CTV 10b5-1 filing: Not disclosed Ownership: Direct Disclosed balance after: 58,843 F1 · shares: Represents restricted stock units that vest as follows: 14,711 on May 15, 2022, 3,678 on each August 15, November 15, February 15 and May 15 thereafter until February 15, 2025 and 3,674 on May 15, 2025, subject to the Reporting Person's continued service to the Issuer through each vesting date. This equity grant may be subject to accelerated vesting in the event the Reporting Person's employment is terminated under certain circumstances. F2 · price: Equity grant under the Issuer's 2014 Equity Incentive Plan. Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.