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Buonasera David

Disclosed activity across 1 company

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2050
SEC CIK
0001966857

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CompanyLast reported asReport datePublished
MAGNITE, INC.MGNI · Entity 2049CHIEF TECHNOLOGY OFFICERSeptember 14, 2026September 16, 2026

Disclosed balances

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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 September 14, 2026 · Filed September 16, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect245,155 Reported balance After 2026-09-14 transaction · row 1
1 source row

Row 1 · 2026-09-14 · Sale · Disposed 1,165 · Balance 245,155

F1: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2026.

Filing footnotes · ownership attribution and instrument terms

F1: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2026.

Transaction history

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Purchases/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 dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
September 14, 2026 Filed Sep 16, 2026 20:23 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 1,165 $24.00 $27,960.00
Disclosure

SEC source: 0001966857-26-000015 · wk-form4_1789590192.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 245,155

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 13, 2026.

Read SEC document
September 02, 2026 Filed Sep 3, 2026 20:56 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 1,043 $25.00 $26,075.00
Disclosure

SEC source: 0001966857-26-000013 · wk-form4_1788468980.xml · nonDerivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 246,320

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
September 01, 2026 Filed Sep 3, 2026 20:56 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 5,371 $23.42 $125,788.82
Disclosure

SEC source: 0001966857-26-000013 · wk-form4_1788468980.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 247,363

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
August 15, 2026 Filed Aug 18, 2026 20:25 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 8,102 $24.73 $200,362.46
Disclosure

SEC source: 0001966857-26-000011 · wk-form4_1787084710.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 252,734

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 06, 2026 Filed Aug 7, 2026 21:09 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 871 $25.00 $21,775.00
Disclosure

SEC source: 0001966857-26-000009 · wk-form4_1786136978.xml · nonDerivative · entry 3

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 260,836

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
August 06, 2026 Filed Aug 7, 2026 21:09 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 2,602 $24.00 $62,448.00
Disclosure

SEC source: 0001966857-26-000009 · wk-form4_1786136978.xml · nonDerivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 261,707

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
August 06, 2026 Filed Aug 7, 2026 21:09 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 4,176 $22.81 $95,254.56
Disclosure

SEC source: 0001966857-26-000009 · wk-form4_1786136978.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 264,309

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.72 to $23.00, 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.

Read SEC document
July 07, 2026 Filed Jul 9, 2026 20:32 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 1,224 $21.00 $25,704.00
Disclosure

SEC source: 0001193125-26-299750 · ownership.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 268,485

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
July 01, 2026 Filed Jul 2, 2026 23:07 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 9,376 $20.00 $187,520.00
Disclosure

SEC source: 0001193125-26-295113 · ownership.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 269,709

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
June 17, 2026 Filed Jun 17, 2026 22:45 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 1,409 $19.00 $26,771.00
Disclosure

SEC source: 0001193125-26-274503 · ownership.xml · nonDerivative · entry 3

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 279,085

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
June 16, 2026 Filed Jun 17, 2026 22:45 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 11,233 $18.00 $202,194.00
Disclosure

SEC source: 0001193125-26-274503 · ownership.xml · nonDerivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 280,494

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
June 15, 2026 Filed Jun 17, 2026 22:45 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 1,057 $17.00 $17,969.00
Disclosure

SEC source: 0001193125-26-274503 · ownership.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 291,727

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
June 01, 2026 Filed Jun 3, 2026 20:45 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 1,409 $15.00 $21,135.00
Disclosure

SEC source: 0001966857-26-000006 · form4-06032026_040601.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 292,784

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on September 11, 2025.

Read SEC document
May 15, 2026 Filed May 19, 2026 21:00 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 8,335 $12.82 $106,854.70
Disclosure

SEC source: 0001966857-26-000005 · form4-05192026_050501.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 294,193

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.

F2 · balance_after: Includes 433 shares acquired by the Reporting Person on May 15, 2026 under the Issuer's Employee Stock Purchase Plan.

Read SEC document
February 15, 2026 Filed Feb 18, 2026 21:30 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 17,137 $11.70 $200,502.90
Disclosure

SEC source: 0001966857-26-000004 · form4-02182026_040222.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 302,095

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 09, 2026 Filed Jan 12, 2026 21:30 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionPerformance Stock Units · Derivative 22,935 $0.00 $0.00
Disclosure

SEC source: 0001966857-26-000003 · form4-01122026_040105.xml · derivative · entry 3

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 22,935 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: Each PSU represents a contingent right to receive, on vesting, one share of the Issuer's common stock, subject to Issuer performance as more specifically described in Footnote 4 herein.

F1 · price: Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan.

F4 · derivative.exercise_date: Vesting of the PSU was determined based on the Issuer's total stockholder return ("TSR") for the three-year period beginning on January 1, 2023 relative to the TSRs of the companies in the Russell 2000 index over that period. The number of PSUs reported in column 5 on the Form 4 filed with the Securities and Exchange Commission on March 2, 2023 reflected the target number of PSUs initially subject to the award. The award was eligible to vest as to 0% to 150% of the target number of PSUs. On January 9, 2026, the Compensation Committee of the Issuer's Board of Directors determined that, based on 126.35% achievement, the Reporting Person actually vested 22,935 shares.

F4 · derivative.expiration_date: Vesting of the PSU was determined based on the Issuer's total stockholder return ("TSR") for the three-year period beginning on January 1, 2023 relative to the TSRs of the companies in the Russell 2000 index over that period. The number of PSUs reported in column 5 on the Form 4 filed with the Securities and Exchange Commission on March 2, 2023 reflected the target number of PSUs initially subject to the award. The award was eligible to vest as to 0% to 150% of the target number of PSUs. On January 9, 2026, the Compensation Committee of the Issuer's Board of Directors determined that, based on 126.35% achievement, the Reporting Person actually vested 22,935 shares.

Read SEC document
January 09, 2026 Filed Jan 12, 2026 21:30 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 12,330 $16.17 $199,376.10
Disclosure

SEC source: 0001966857-26-000003 · form4-01122026_040105.xml · nonDerivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 319,232

F2 · 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 the performance stock units ("PSUs") being reported herein.

Read SEC document
January 09, 2026 Filed Jan 12, 2026 21:30 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionCommon Stock 22,935 $0.00 $0.00
Disclosure

SEC source: 0001966857-26-000003 · form4-01122026_040105.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 331,562

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Equity grant under the Company's Amended and Restated 2014 Equity Incentive Plan.

Read SEC document
January 01, 2026 Filed Jan 6, 2026 00:17 UTC MAGNITE, INC. MGNI · Entity 2049 GrantPerformance Stock Units · Derivative 25,801 $0.00 $0.00
Disclosure

SEC source: 0001966857-26-000001 · form4-01062026_120152.xml · derivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,801

Underlying: Common Stock · 25,801 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 Amended and Restated 2014 Equity Incentive Plan.

F4 · derivative.exercise_date: The PSUs will generally vest on the three-year anniversary of the grant date of the award subject to the Reporting Person's continued service through such date. The number of shares vested will be determined based on the Issuer's total stockholder return ("TSR") relative to the TSRs of the companies in the Russell 2000 index for the three year-period beginning January 1, 2026, as well as certain interim measurements based on relative TSR for the one-year and two-year periods beginning on January 1, 2026. 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: The PSUs will generally vest on the three-year anniversary of the grant date of the award subject to the Reporting Person's continued service through such date. The number of shares vested will be determined based on the Issuer's total stockholder return ("TSR") relative to the TSRs of the companies in the Russell 2000 index for the three year-period beginning January 1, 2026, as well as certain interim measurements based on relative TSR for the one-year and two-year periods beginning on January 1, 2026. 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, 2026 Filed Jan 6, 2026 00:17 UTC MAGNITE, INC. MGNI · Entity 2049 GrantCommon Stock 76,803 $0.00 $0.00
Disclosure

SEC source: 0001966857-26-000001 · form4-01062026_120152.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 308,627

F1 · shares: Represents restricted stock units that vest as follows: 20,801 on February 15, 2027, 4,800 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2029 and 3,202 on February 15, 2030, 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 Amended and Restated 2014 Equity Incentive Plan.

Read SEC document
November 15, 2025 Filed Nov 18, 2025 23:00 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 7,129 $14.15 $100,875.35
Disclosure

SEC source: 0001966857-25-000003 · form4-11182025_061109.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 231,824

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.

F2 · balance_after: Includes 324 shares acquired by the Reporting Person on November 15, 2025 under the Issuer's Employee Stock Purchase Plan.

Read SEC document
September 03, 2025 Filed Sep 4, 2025 21:00 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 2,950 $25.37 $74,841.50
Disclosure

SEC source: 0001415889-25-023710 · form4-09042025_050922.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 238,629

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

Read SEC document
August 18, 2025 Filed Aug 20, 2025 20:30 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 7,834 $23.85 $186,840.90
Disclosure

SEC source: 0001415889-25-022452 · form4-08202025_040814.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 241,579

F1 · kind: These shares were sold to cover the Reporting Person's tax obligation resulting from the settlement of vested Restricted Stock Units. The sale is mandated by the Issuer's election to require the satisfaction of tax withholding obligations to be funded by sell to cover transactions and does not represent a discretionary transaction by the Reporting Person.

Read SEC document
June 30, 2025 Filed Jul 2, 2025 20:15 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 9,289 $22.00 $204,358.00
Disclosure

SEC source: 0001415889-25-019022 · form4-07022025_040729.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 249,413

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

Read SEC document
May 27, 2025 Filed May 28, 2025 21:16 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 8,742 $16.00 $139,872.00
Disclosure

SEC source: 0001415889-25-014739 · form4-05282025_090510.xml · nonDerivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 258,702

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

Read SEC document
May 23, 2025 Filed May 28, 2025 21:16 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 3,653 $15.03 $54,904.59
Disclosure

SEC source: 0001415889-25-014739 · form4-05282025_090510.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 267,444

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

Read SEC document
May 15, 2025 Filed May 16, 2025 21:40 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 8,038 $15.88 $127,643.44
Disclosure

SEC source: 0001415889-25-013475 · form4-05162025_050515.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 271,097

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.

F2 · balance_after: Includes 340 shares acquired by the Reporting Person on May 15, 2025 under the Issuer's Employee Stock Purchase Plan.

Read SEC document
February 15, 2025 Filed Feb 19, 2025 21:30 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 17,384 $20.00 $347,680.00
Disclosure

SEC source: 0001415889-25-004641 · form4-02192025_090229.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 278,795

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 09, 2025 Filed Jan 13, 2025 22:40 UTC MAGNITE, INC. MGNI · Entity 2049 GrantPerformance Stock Units · Derivative 24,366 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-001398 · form4-01132025_100107.xml · derivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,366

Underlying: Common Stock · 24,366 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 Amended and Restated 2014 Equity Incentive Plan.

F4 · derivative.exercise_date: The PSUs will generally vest on the three-year anniversary of the grant date of the award subject to the Reporting Person's continued service through such date. The number of shares vested will be determined based on the Issuer's total stockholder return ("TSR") relative to the TSRs of the companies in the Russell 2000 index for the three year-period beginning January 1, 2025, as well as certain interim measurements based on relative TSR for the one-year and two-year periods beginning on January 1, 2025. 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: The PSUs will generally vest on the three-year anniversary of the grant date of the award subject to the Reporting Person's continued service through such date. The number of shares vested will be determined based on the Issuer's total stockholder return ("TSR") relative to the TSRs of the companies in the Russell 2000 index for the three year-period beginning January 1, 2025, as well as certain interim measurements based on relative TSR for the one-year and two-year periods beginning on January 1, 2025. 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 09, 2025 Filed Jan 13, 2025 22:40 UTC MAGNITE, INC. MGNI · Entity 2049 GrantCommon Stock 72,384 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-001398 · form4-01132025_100107.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 296,179

F1 · shares: Represents restricted stock units that vest as follows: 19,604 on February 15, 2026, 4,524 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2028 and 3,016 on February 15, 2029, 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 Amended and Restated 2014 Equity Incentive Plan.

Read SEC document
December 13, 2024 Filed Dec 13, 2024 22:09 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 1,969 $16.31 $32,114.39
Disclosure

SEC source: 0001415889-24-029337 · form4-12132024_101213.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 223,795

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

Read SEC document
November 27, 2024 Filed Nov 27, 2024 22:25 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 431 $16.78 $7,232.18
Disclosure

SEC source: 0001415889-24-027883 · form4-11272024_101157.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 225,764

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

Read SEC document
November 22, 2024 Filed Nov 26, 2024 21:05 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 9,219 $17.00 $156,723.00
Disclosure

SEC source: 0001415889-24-027700 · form4-11262024_091146.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 226,195

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

Read SEC document
November 18, 2024 Filed Nov 20, 2024 01:03 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 277 $15.77 $4,368.29
Disclosure

SEC source: 0001415889-24-027281 · form4-11202024_011115.xml · nonDerivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 235,414

F3 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

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November 15, 2024 Filed Nov 20, 2024 01:03 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 5,056 $15.85 $80,137.60
Disclosure

SEC source: 0001415889-24-027281 · form4-11202024_011115.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 235,691

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.

F2 · balance_after: Includes 344 shares acquired by the Reporting Person on November 15, 2024 under the Issuer's Employee Stock Purchase Plan.

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November 14, 2024 Filed Nov 15, 2024 21:15 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 12,412 $16.41 $203,680.92
Disclosure

SEC source: 0001415889-24-026947 · form4-11152024_041101.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 240,403

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 15, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $16.125 to $16.72 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.

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September 01, 2024 Filed Sep 4, 2024 22:45 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 5,287 $13.79 $72,907.73
Disclosure

SEC source: 0001415889-24-022817 · form4-09042024_090947.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 252,815

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.

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August 15, 2024 Filed Aug 16, 2024 21:10 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 10,000 $12.65 $126,500.00
Disclosure

SEC source: 0001415889-24-021483 · form4-08162024_090856.xml · nonDerivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 258,102

F2 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 14, 2023.

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August 15, 2024 Filed Aug 16, 2024 21:10 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 3,760 $12.51 $47,037.60
Disclosure

SEC source: 0001415889-24-021483 · form4-08162024_090856.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 268,102

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.

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May 16, 2024 Filed May 17, 2024 20:15 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 5,500 $12.50 $68,750.00
Disclosure

SEC source: 0001415889-24-013479 · form4-05172024_040501.xml · nonDerivative · entry 2

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 271,862

F2 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 14, 2023.

F3 · balance_after: Includes 277 shares acquired by the Reporting Person on November 15, 2023 and 843 shares acquired by the Reporting Person on May 15, 2024, each under the Issuer's Employee Stock Purchase Plan.

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May 15, 2024 Filed May 17, 2024 20:15 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 7,632 $9.80 $74,793.60
Disclosure

SEC source: 0001415889-24-013479 · form4-05172024_040501.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 276,242

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.

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February 15, 2024 Filed Feb 16, 2024 21:29 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 6,765 $9.74 $65,891.10
Disclosure

SEC source: 0001415889-24-004139 · form4-02162024_090231.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · CHIEF TECHNOLOGY OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 283,874

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.

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January 02, 2024 Filed Jan 4, 2024 22:06 UTC MAGNITE, INC. MGNI · Entity 2049 GrantPerformance Stock Units · Derivative 30,339 $0.00 $0.00
Disclosure

SEC source: 0001209191-24-000847 · doc4.xml · derivative · entry 2

Buonasera David · CIK 0001966857 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,339

Underlying: Common Stock · 30,339 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 Amended and Restated 2014 Equity Incentive Plan.

F4 · derivative.exercise_date: The PSUs will generally vest on the three-year anniversary of the grant date of the award subject to the Reporting Person's continued service through such date. The number of shares vested will be determined based on the Issuer's total stockholder return ("TSR") relative to the TSRs of the companies in the Russell 2000 index for the three year-period beginning January 1, 2024, as well as certain interim measurements based on relative TSR for the one-year and two-year periods beginning on January 1, 2024. 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: The PSUs will generally vest on the three-year anniversary of the grant date of the award subject to the Reporting Person's continued service through such date. The number of shares vested will be determined based on the Issuer's total stockholder return ("TSR") relative to the TSRs of the companies in the Russell 2000 index for the three year-period beginning January 1, 2024, as well as certain interim measurements based on relative TSR for the one-year and two-year periods beginning on January 1, 2024. 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.

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January 02, 2024 Filed Jan 4, 2024 22:06 UTC MAGNITE, INC. MGNI · Entity 2049 GrantCommon Stock 85,058 $0.00 $0.00
Disclosure

SEC source: 0001209191-24-000847 · doc4.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 290,639

F1 · shares: Represents restricted stock units that vest as follows: 23,037 on February 15, 2025, 5,316 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2027 and 3,545 on February 15, 2028, 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 Amended and Restated 2014 Equity Incentive Plan.

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November 15, 2023 Filed Nov 17, 2023 21:20 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 1,665 $7.89 $13,136.85
Disclosure

SEC source: 0001209191-23-055748 · doc4.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 205,581

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.

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September 06, 2023 Filed Sep 7, 2023 22:05 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 5,444 $8.58 $46,709.52
Disclosure

SEC source: 0001209191-23-048683 · doc4.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 207,246

F1 · kind: Represents the non-discretionary sale 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.

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August 16, 2023 Filed Aug 18, 2023 20:25 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 2,648 $8.31 $22,004.88
Disclosure

SEC source: 0001209191-23-046544 · doc4.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 212,690

F1 · kind: Represents the non-discretionary sale 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.

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July 03, 2023 Filed Jul 6, 2023 21:49 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 6,624 $13.43 $88,960.32
Disclosure

SEC source: 0001209191-23-041641 · doc4.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 215,338

F1 · kind: Represents the non-discretionary sale 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.

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May 16, 2023 Filed May 19, 2023 00:03 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 1,559 $10.88 $16,961.92
Disclosure

SEC source: 0001209191-23-030827 · doc4.xml · nonDerivative · entry 1

Buonasera David · CIK 0001966857 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 221,962

F1 · kind: Represents the non-discretionary sale 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 · balance_after: Includes 1,964 shares acquired by the Reporting Person on May 15, 2023 under the Issuer's employee stock purchase plan.

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February 28, 2023 Filed Mar 2, 2023 21:30 UTC MAGNITE, INC. MGNI · Entity 2049 GrantPerformance Stock Units · Derivative 18,152 $0.00 $0.00
Disclosure

SEC source: 0001209191-23-014686 · doc4.xml · derivative · entry 2

Buonasera David · CIK 0001966857 · Chief Technology Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,152

Underlying: Common Stock · 18,152 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 commencing January 1, 2023 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 commencing January 1, 2023 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.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.