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Evans Katie Seitz

Disclosed activity across 2 companies

Tapewire entity
22052
SEC CIK
0001700262

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
MAGNITE, INC.MGNI · Entity 2049See RemarksSeptember 11, 2026September 11, 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 September 11, 2026 · Filed September 11, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect441,800 Reported balance After 2026-09-11 transaction · row 1
1 source row

Row 1 · 2026-09-11 · Sale · Disposed 13,997 · Balance 441,800

F1: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 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 8, 2026.

Past disclosures · reporting ended (1)

No longer tracked through insider filings. These historical balances do not imply present ownership or a zero position.

Telaria, Inc.

Report date April 01, 2020 · Filed April 03, 2020

Section 16 reporting ended · disclosed 2020-04-03. Current position is not established by this disclosure.

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect0 Reported balance After 2020-04-01 transaction · row 1
1 source row

Row 1 · 2020-04-01 · Disposition to issuer · Disposed 215,407 · Balance 0

F1: On April 1, 2020, the effective date (the "Effective Date") of the merger between the Issuer and The Rubicon Project, Inc. ("Rubicon"), each share of Issuer common stock was exchanged for 1.082 shares of Rubicon common stock.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $1.11 · Expires 2020-06-24Direct0 Reported balance After 2020-04-01 transaction · row 2 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 2 · 2020-04-01 · Disposition to issuer · Disposed 488 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $4.28 · Expires 2021-02-03Direct0 Reported balance After 2020-04-01 transaction · row 3 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 3 · 2020-04-01 · Disposition to issuer · Disposed 1,333 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $4.28 · Expires 2021-06-08Direct0 Reported balance After 2020-04-01 transaction · row 4 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 4 · 2020-04-01 · Disposition to issuer · Disposed 1,333 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $5.01 · Expires 2022-07-26Direct0 Reported balance After 2020-04-01 transaction · row 5 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 5 · 2020-04-01 · Disposition to issuer · Disposed 2,666 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $5.90 · Expires 2023-03-05Direct0 Reported balance After 2020-04-01 transaction · row 7 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 7 · 2020-04-01 · Disposition to issuer · Disposed 6,666 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $8.37 · Expires 2023-07-31Direct0 Reported balance After 2020-04-01 transaction · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2020-04-01 · Disposition to issuer · Disposed 5,000 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $4.27 · Expires 2023-12-05Direct0 Reported balance After 2020-04-01 transaction · row 9 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 9 · 2020-04-01 · Disposition to issuer · Disposed 21,231 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.90 · Expires 2028-02-27Direct0 Reported balance After 2020-04-01 transaction · row 10 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 10 · 2020-04-01 · Disposition to issuer · Disposed 51,883 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $5.58 · Expires 2029-02-28Direct0 Reported balance After 2020-04-01 transaction · row 11 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 11 · 2020-04-01 · Disposition to issuer · Disposed 31,004 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Stock Opton (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $5.01 · Expires 2022-07-19Direct0 Reported balance After 2020-04-01 transaction · row 6 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 6 · 2020-04-01 · Disposition to issuer · Disposed 2,666 · Balance 0

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

Restricted Stock UnitSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct0 Reported balance After 2020-04-01 transaction · row 12 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 12 · 2020-04-01 · Disposition to issuer · Disposed 12,500 · Balance 0

F3: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F4: On the Effective Date, pursuant to the merger agreement, restricted stock units were assumed by Rubicon, with the same vesting and other terms, at an exchange ratio of 1.082 Rubicon restricted stock units for each Issuer restricted stock unit reported herein, rounded down to the nearest whole share.

Restricted Stock UnitSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct0 Reported balance After 2020-04-01 transaction · row 13 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 13 · 2020-04-01 · Disposition to issuer · Disposed 31,250 · Balance 0

F3: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F4: On the Effective Date, pursuant to the merger agreement, restricted stock units were assumed by Rubicon, with the same vesting and other terms, at an exchange ratio of 1.082 Rubicon restricted stock units for each Issuer restricted stock unit reported herein, rounded down to the nearest whole share.

Restricted Stock UnitSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct0 Reported balance After 2020-04-01 transaction · row 14 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 14 · 2020-04-01 · Disposition to issuer · Disposed 12,820 · Balance 0

F3: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F4: On the Effective Date, pursuant to the merger agreement, restricted stock units were assumed by Rubicon, with the same vesting and other terms, at an exchange ratio of 1.082 Rubicon restricted stock units for each Issuer restricted stock unit reported herein, rounded down to the nearest whole share.

Restricted Stock UnitSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct0 Reported balance After 2020-04-01 transaction · row 15 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 15 · 2020-04-01 · Disposition to issuer · Disposed 34,722 · Balance 0

F3: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F4: On the Effective Date, pursuant to the merger agreement, restricted stock units were assumed by Rubicon, with the same vesting and other terms, at an exchange ratio of 1.082 Rubicon restricted stock units for each Issuer restricted stock unit reported herein, rounded down to the nearest whole share.

Filing footnotes · ownership attribution and instrument terms

F1: On April 1, 2020, the effective date (the "Effective Date") of the merger between the Issuer and The Rubicon Project, Inc. ("Rubicon"), each share of Issuer common stock was exchanged for 1.082 shares of Rubicon common stock.

F2: These options were assumed by Rubicon pursuant to the merger agreement on the Effective Date with the same vesting and other terms at the rate of 1.082 Rubicon options for each Issuer option, rounded down to the nearest whole share, and with an exercise price per share of each Rubicon option equal to the exercise price herein divided by 1.082, rounded up to the nearest cent.

F3: Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.

F4: On the Effective Date, pursuant to the merger agreement, restricted stock units were assumed by Rubicon, with the same vesting and other terms, at an exchange ratio of 1.082 Rubicon restricted stock units for each Issuer restricted stock unit reported herein, rounded down to the nearest whole share.

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 11, 2026 Filed Sep 11, 2026 20:19 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 13,997 $24.00 $335,928.00
Disclosure

SEC source: 0001700262-26-000013 · wk-form4_1789157993.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 441,800

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026.

Read SEC document
September 09, 2026 Filed Sep 10, 2026 20:39 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 11,100 $23.46 $260,406.00
Disclosure

SEC source: 0001700262-26-000011 · wk-form4_1789072765.xml · nonDerivative · entry 3

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 455,797

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026.

F3 · price: 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.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:39 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionEmployee Stock Option (Right to Buy) · Derivative 13,546 $0.00 Strike: $5.16 $0.00
Disclosure

SEC source: 0001700262-26-000011 · wk-form4_1789072765.xml · derivative · entry 4

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 13,546 shares

Expires 2029-02-27

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 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026.

F5 · price: Granted as compensation for services.

F4 · derivative.exercise_date: The stock options have fully vested and are immediately exercisable.

F6 · balance_after: 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.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:39 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 32,285 $23.63 $762,894.55
Disclosure

SEC source: 0001700262-26-000011 · wk-form4_1789072765.xml · nonDerivative · entry 2

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 466,897

F1 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026.

F2 · price: 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.

Read SEC document
September 08, 2026 Filed Sep 10, 2026 20:39 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionCommon Stock 13,546 $5.16 $69,897.36
Disclosure

SEC source: 0001700262-26-000011 · wk-form4_1789072765.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 499,182

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 · kind: The reported transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 8, 2026.

Read SEC document
August 15, 2026 Filed Aug 18, 2026 20:23 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 11,204 $24.73 $277,074.92
Disclosure

SEC source: 0001700262-26-000009 · wk-form4_1787084592.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 485,636

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 21:06 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionEmployee Stock Option (Right to Buy) · Derivative 20,000 $0.00 Strike: $5.16 $0.00
Disclosure

SEC source: 0001700262-26-000007 · wk-form4_1786136771.xml · derivative · entry 3

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 20,000 shares

Expires 2029-02-27

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 · kind: This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 28, 2025.

F3 · price: Granted as compensation for services.

F2 · derivative.exercise_date: The stock options have fully vested and are immediately exercisable.

Read SEC document
August 06, 2026 Filed Aug 7, 2026 21:06 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 20,000 $24.00 $480,000.00
Disclosure

SEC source: 0001700262-26-000007 · wk-form4_1786136771.xml · nonDerivative · entry 2

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 496,840

F1 · kind: This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 28, 2025.

Read SEC document
August 06, 2026 Filed Aug 7, 2026 21:06 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionCommon Stock 20,000 $5.16 $103,200.00
Disclosure

SEC source: 0001700262-26-000007 · wk-form4_1786136771.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · See Remarks

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 516,840

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 · kind: This exercise and subsequent sale were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 28, 2025.

Read SEC document
May 15, 2026 Filed May 19, 2026 21:00 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 11,204 $12.82 $143,635.28
Disclosure

SEC source: 0001700262-26-000004 · form4-05192026_050506.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 496,840

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 15, 2026 Filed Feb 18, 2026 21:30 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 27,428 $11.70 $320,907.60
Disclosure

SEC source: 0001700262-26-000003 · form4-02182026_040218.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 508,044

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 51,300 $0.00 $0.00
Disclosure

SEC source: 0001700262-26-000002 · form4-01122026_040109.xml · derivative · entry 3

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 51,300 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 January 4, 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 51,300 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 January 4, 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 51,300 shares.

Read SEC document
January 09, 2026 Filed Jan 12, 2026 21:30 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 26,836 $16.17 $433,938.12
Disclosure

SEC source: 0001700262-26-000002 · form4-01122026_040109.xml · nonDerivative · entry 2

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 535,472

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 51,300 $0.00 $0.00
Disclosure

SEC source: 0001700262-26-000002 · form4-01122026_040109.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 562,308

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 00:14 UTC MAGNITE, INC. MGNI · Entity 2049 GrantPerformance Stock Units · Derivative 42,757 $0.00 $0.00
Disclosure

SEC source: 0001700262-26-000001 · form4-01062026_120144.xml · derivative · entry 2

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,757

Underlying: Common Stock · 42,757 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 00:14 UTC MAGNITE, INC. MGNI · Entity 2049 GrantCommon Stock 127,273 $0.00 $0.00
Disclosure

SEC source: 0001700262-26-000001 · form4-01062026_120144.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 511,008

F1 · shares: Represents restricted stock units that vest as follows: 34,470 on February 15, 2027, 7,955 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2029 and 5,298 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 10,354 $14.15 $146,509.10
Disclosure

SEC source: 0001700262-25-000004 · form4-11182025_061112.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 383,735

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 27, 2025 Filed Aug 29, 2025 20:30 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 21,509 $25.52 $548,909.68
Disclosure

SEC source: 0001415889-25-023301 · form4-08292025_040801.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 394,089

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.52 to $25.58, 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
August 25, 2025 Filed Aug 26, 2025 21:00 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 8,345 $26.00 $216,970.00
Disclosure

SEC source: 0001415889-25-023034 · form4-08262025_050801.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 415,598

F1 · kind: These shares were sold pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 6, 2025.

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August 18, 2025 Filed Aug 20, 2025 20:30 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 10,487 $23.85 $250,114.95
Disclosure

SEC source: 0001415889-25-022455 · form4-08202025_040820.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 423,943

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.

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June 30, 2025 Filed Jul 2, 2025 20:15 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionStock Option (Right to Buy) · Derivative 16,137 $0.00 Strike: $3.61 $0.00
Disclosure

SEC source: 0001415889-25-019025 · form4-07022025_040735.xml · derivative · entry 4

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 16,137 shares

Expires 2028-02-26

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 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

F3 · price: Granted as compensation for services.

F2 · derivative.exercise_date: 25% of the total number of shares underlying this option vested on February 14, 2019 and the remaining shares vested 1/36 per month over the next 36 months thereafter.

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June 30, 2025 Filed Jul 2, 2025 20:15 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 16,137 $24.00 $387,288.00
Disclosure

SEC source: 0001415889-25-019025 · form4-07022025_040735.xml · nonDerivative · entry 3

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 434,430

F1 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

Read SEC document
June 30, 2025 Filed Jul 2, 2025 20:15 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 8,358 $22.00 $183,876.00
Disclosure

SEC source: 0001415889-25-019025 · form4-07022025_040735.xml · nonDerivative · entry 2

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 450,567

F1 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

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June 30, 2025 Filed Jul 2, 2025 20:15 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionCommon Stock 16,137 $3.61 $58,254.57
Disclosure

SEC source: 0001415889-25-019025 · form4-07022025_040735.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 458,925

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 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

Read SEC document
June 16, 2025 Filed Jun 18, 2025 20:48 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionStock Option (Right to Buy) · Derivative 20,000 $0.00 Strike: $3.61 $0.00
Disclosure

SEC source: 0001415889-25-017700 · form4-06182025_080600.xml · derivative · entry 3

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 16,137

Underlying: Common Stock · 20,000 shares

Expires 2028-02-26

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 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

F3 · price: Granted as compensation for services.

F2 · derivative.exercise_date: 25% of the total number of shares underlying this option vested on February 14, 2019 and the remaining shares vested 1/36 per month over the next 36 months thereafter.

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June 16, 2025 Filed Jun 18, 2025 20:48 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 20,000 $18.50 $370,000.00
Disclosure

SEC source: 0001415889-25-017700 · form4-06182025_080600.xml · nonDerivative · entry 2

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 442,788

F1 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

Read SEC document
June 16, 2025 Filed Jun 18, 2025 20:48 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionCommon Stock 20,000 $3.61 $72,200.00
Disclosure

SEC source: 0001415889-25-017700 · form4-06182025_080600.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 462,788

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 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

Read SEC document
June 05, 2025 Filed Jun 6, 2025 21:59 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionStock Option (Right to Buy) · Derivative 20,000 $0.00 Strike: $3.61 $0.00
Disclosure

SEC source: 0001415889-25-016038 · form4-06062025_090652.xml · derivative · entry 3

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 36,137

Underlying: Common Stock · 20,000 shares

Expires 2028-02-26

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 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

F4 · price: Granted as compensation for services.

F3 · derivative.exercise_date: 25% of the total number of shares underlying this option vested on February 14, 2019 and the remaining shares vested 1/36 per month over the next 36 months thereafter.

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June 05, 2025 Filed Jun 6, 2025 21:59 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 35,000 $17.36 $607,600.00
Disclosure

SEC source: 0001415889-25-016038 · form4-06062025_090652.xml · nonDerivative · entry 2

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 442,788

F1 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 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 $16.83 to $17.60 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
June 05, 2025 Filed Jun 6, 2025 21:59 UTC MAGNITE, INC. MGNI · Entity 2049 Exercise / conversionCommon Stock 20,000 $3.61 $72,200.00
Disclosure

SEC source: 0001415889-25-016038 · form4-06062025_090652.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 477,788

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 · kind: This exercise and subsequent sales were made pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 6, 2025.

Read SEC document
May 15, 2025 Filed May 16, 2025 21:40 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 10,860 $15.88 $172,456.80
Disclosure

SEC source: 0001415889-25-013472 · form4-05162025_050509.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 457,788

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 15, 2025 Filed Feb 19, 2025 21:25 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 23,481 $20.00 $469,620.00
Disclosure

SEC source: 0001415889-25-004621 · form4-02192025_090227.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 468,648

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 07, 2025 Filed Feb 7, 2025 23:45 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 12,520 $20.00 $250,400.00
Disclosure

SEC source: 0001415889-25-003398 · form4-02072025_110255.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 492,129

F1 · kind: The transaction reported was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2024.

Read SEC document
January 09, 2025 Filed Jan 13, 2025 22:37 UTC MAGNITE, INC. MGNI · Entity 2049 GrantPerformance Stock Units · Derivative 41,566 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-001394 · form4-01132025_100150.xml · derivative · entry 2

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,566

Underlying: Common Stock · 41,566 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.

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January 09, 2025 Filed Jan 13, 2025 22:37 UTC MAGNITE, INC. MGNI · Entity 2049 GrantCommon Stock 123,479 $0.00 $0.00
Disclosure

SEC source: 0001415889-25-001394 · form4-01132025_100150.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · President, Operations

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 504,649

F1 · shares: Represents restricted stock units that vest as follows: 33,442 on February 15, 2026, 7,717 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2028 and 5,150 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
November 15, 2024 Filed Nov 20, 2024 01:06 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 7,483 $15.85 $118,605.55
Disclosure

SEC source: 0001415889-24-027285 · form4-11202024_011149.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · CHIEF OPERATING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 381,170

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
November 11, 2024 Filed Nov 13, 2024 21:15 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 12,824 $16.00 $205,184.00
Disclosure

SEC source: 0001415889-24-026692 · form4-11132024_041107.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · CHIEF OPERATING OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 388,653

F1 · kind: The transaction reported was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 2024.

Read SEC document
August 15, 2024 Filed Aug 16, 2024 21:06 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 7,483 $12.51 $93,612.33
Disclosure

SEC source: 0001415889-24-021473 · form4-08162024_090829.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · CHIEF OPERATING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 401,477

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 13, 2024 Filed Jun 14, 2024 20:30 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 14,541 $13.77 $200,229.57
Disclosure

SEC source: 0001415889-24-016937 · form4-06142024_040628.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · CHIEF OPERATING OFFICER

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 408,960

F1 · kind: The transaction reported was effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 14, 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 $13.674 to $13.84, 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.

Read SEC document
May 15, 2024 Filed May 17, 2024 21:00 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 9,448 $9.80 $92,590.40
Disclosure

SEC source: 0001415889-24-013564 · form4-05172024_050520.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · CHIEF OPERATING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 423,501

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 15, 2024 Filed Feb 16, 2024 21:24 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 23,105 $9.74 $225,042.70
Disclosure

SEC source: 0001415889-24-004132 · form4-02162024_090230.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · CHIEF OPERATING OFFICER

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 432,949

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 02, 2024 Filed Jan 4, 2024 22:02 UTC MAGNITE, INC. MGNI · Entity 2049 GrantPerformance Stock Units · Derivative 40,602 $0.00 $0.00
Disclosure

SEC source: 0001209191-24-000837 · doc4.xml · derivative · entry 2

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,602

Underlying: Common Stock · 40,602 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 22:02 UTC MAGNITE, INC. MGNI · Entity 2049 GrantCommon Stock 113,821 $0.00 $0.00
Disclosure

SEC source: 0001209191-24-000837 · doc4.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 456,054

F1 · shares: Represents restricted stock units that vest as follows: 30,826 on February 15, 2025, 7,114 on each May 15, August 15, November 15, and February 15 thereafter until November 15, 2027 and 4,741 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.

Read SEC document
November 15, 2023 Filed Nov 17, 2023 21:22 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 6,800 $7.89 $53,652.00
Disclosure

SEC source: 0001209191-23-055751 · doc4.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 342,233

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 16, 2023 Filed Aug 18, 2023 20:30 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 7,038 $8.31 $58,485.78
Disclosure

SEC source: 0001209191-23-046553 · doc4.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 349,033

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.

Read SEC document
July 11, 2023 Filed Jul 13, 2023 20:55 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 17,774 $15.00 $266,610.00
Disclosure

SEC source: 0001209191-23-042228 · doc4.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 356,071

F1 · kind: These sales were made pursuant to a Rule 10b5-1 Trading Plan adopted by the Reporting Person on March 13, 2023.

Read SEC document
June 12, 2023 Filed Jun 14, 2023 20:28 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 11,098 $13.43 $149,046.14
Disclosure

SEC source: 0001209191-23-037027 · doc4.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 373,845

F1 · kind: These sales were made pursuant to a Rule 10b5-1 Trading Plan adopted by the Reporting Person on March 13, 2023.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.36 to $13.49, 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.

Read SEC document
May 16, 2023 Filed May 19, 2023 00:00 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 7,450 $10.88 $81,056.00
Disclosure

SEC source: 0001209191-23-030825 · doc4.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 384,943

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.

Read SEC document
March 01, 2023 Filed Mar 3, 2023 21:32 UTC MAGNITE, INC. MGNI · Entity 2049 SaleCommon Stock 78,155 $10.99 $858,923.45
Disclosure

SEC source: 0001209191-23-015536 · doc4.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 392,393

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $10.87 to $11.09, 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.

Read SEC document
February 15, 2023 Filed Feb 17, 2023 21:41 UTC MAGNITE, INC. MGNI · Entity 2049 Tax withholdingCommon Stock 16,067 $13.27 $213,209.09
Disclosure

SEC source: 0001209191-23-010675 · doc4.xml · nonDerivative · entry 1

Evans Katie Seitz · CIK 0001700262 · Chief Operating Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 470,548

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

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