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Zagorski Mark

Disclosed activity across 4 companies

Tapewire entity
33777
SEC CIK
0001709574

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
DoubleVerify Holdings, Inc.DV · Entity 4486Director · Chief Executive OfficerSeptember 30, 2026October 03, 2026
MAGNITE, INC.RUBI · Entity 2049President & COOApril 01, 2020April 03, 2020
Teads Holding Co.TEAD · Entity 7241DirectorMay 13, 2026May 18, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

DoubleVerify Holdings, Inc.

Report date September 30, 2026 · Filed October 03, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect616,728 Ending reported balance After 2026-09-30 transaction · row 2
2 source rows · reconciled sequence

Row 1 · 2026-09-30 · Exercise / conversion · Acquired 13,476 · Balance 623,608

F1: Each restricted stock unit was granted on August 19, 2025. 8.33% of the restricted stock units vested and were settled on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

Row 2 · 2026-09-30 · Tax withholding · Disposed 6,880 · Balance 616,728

F2: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Restricted Stock UnitsSEC Table II · derivative / convertible securityDirect107,804 Reported balance After 2026-09-30 transaction · row 3 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 3 · 2026-09-30 · Exercise / conversion · Disposed 13,476 · Balance 107,804

F3: Restricted stock units convert into common stock on a one-for-one basis.

F1: Each restricted stock unit was granted on August 19, 2025. 8.33% of the restricted stock units vested and were settled on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

Filing footnotes · ownership attribution and instrument terms

F1: Each restricted stock unit was granted on August 19, 2025. 8.33% of the restricted stock units vested and were settled on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

F2: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

F3: Restricted stock units convert into common stock on a one-for-one basis.

MAGNITE, INC.

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

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect348,921 Reported balance After 2020-04-01 transaction · row 1 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 1 · 2020-04-01 · Grant · Acquired 348,922 · Balance 348,921

F1: Received on April 1, 2020, the effective date (the "Effective Date") of the merger between the Issuer and Telaria, Inc. ("Telaria"), pursuant to that certain Agreement and Plan of Merger, dated as of December 19, 2019. At the closing of the merger, Telaria common stock and restricted stock units were converted to Issuer common stock and Issuer restricted stock units (the "RSUs") at an exchange ratio of 1.082.

F2: Includes (i) 90,629 shares underlying RSUs that vested on the Effective Date in connection with the merger, (ii) 50,432 RSUs that will vest on July 10, 2021; (iii) 20,806 RSUs that will vest on February 14, 2022, (iv) 19,390 RSUs that will vest on February 14, 2022, and (v) 19,391 RSUs that will vest on February 14, 2023, in each case subject to the Reporting Person providing Continuous Service to the Issuer on each such date.

Common StockSEC Table I · non-derivativeDirect436,917 Reported balance After 2020-04-01 transaction · row 2 Account or security details depend on footnotes; rows are not merged.
1 source row

Row 2 · 2020-04-01 · Grant · Acquired 87,996 · Balance 436,917

F3: Grant to the Reporting Person of an RSU. Each RSU represents a contingent right to receive one share of common stock of the Issuer. The shares underlying the RSU will vest in full on October 1, 2020, provided the Reporting Person continues to provide services to the Issuer on such vesting date.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $3.61 · Expires 2028-02-27Direct168,412 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 · Grant · Acquired 168,412 · Balance 168,412

F4: 25% of the total number of shares underlying this option vested on February 14, 2019 and the remaining shares were scheduled to vest 1/48 per month over the next 36 months thereafter, subject to continued service to the Issuer through each vesting date. In connection with the merger, vesting was partially accelerated so that on the Effective Date, the Reporting Person immediately vested in that number of shares underlying the option as if he had provided an additional 12 months of continuous service as of the Effective Date. Commencing on April 14, 2021, subject to continuous service, the shares underlying the options will continue to vest 1/48 per month until full vested.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $5.16 · Expires 2029-02-28Direct73,192 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 · Grant · Acquired 73,192 · Balance 73,192

F5: 25% of the total number of shares underlying this option vested on February 14, 2020 and the remaining shares were scheduled to vest 1/48 per month over the next 36 months thereafter, subject to continued service to the Issuer through each vesting date. In connection with the merger, vesting was partially accelerated so that on the Effective Date, the Reporting Person immediately vested in that number of shares underlying the option as if he had provided an additional 12 months of continuous service on the Effective Date. Commencing on April 14, 2021, subject to continuous service, the shares underlying the options will continue to vest 1/48 per month until fully vested.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $2.19 · Expires 2027-07-10Direct486,900 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 · Grant · Acquired 486,900 · Balance 486,900

F6: 25% of the total number of shares underlying this option vested on July 10, 2018 and the remaining shares were scheduled to vest 1/48 per month over the next 36 months thereafter, subject to continued service to the Issuer through each vesting date. In connection with the merger, vesting was partially accelerated so that on the Effective Date, the Reporting Person immediately vested in that number of shares underlying the option as if he had provided an additional 12 months of continuous service as of the Effective Date. Commencing on April 10, 2021, subject to continuous service, the shares underlying the options will continue to vest 1/48 per month until fully vested.

Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $2.19 · Expires 2027-07-10Direct486,900 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 · Grant · Acquired 486,900 · Balance 486,900

F7: The shares underlying this option are fully vested. 50% of the shares underlying the option are currently exercisable and 50% of the shares underlying the option will be exercisable in September 2020, subject to continued service to the Issuer

Filing footnotes · ownership attribution and instrument terms

F1: Received on April 1, 2020, the effective date (the "Effective Date") of the merger between the Issuer and Telaria, Inc. ("Telaria"), pursuant to that certain Agreement and Plan of Merger, dated as of December 19, 2019. At the closing of the merger, Telaria common stock and restricted stock units were converted to Issuer common stock and Issuer restricted stock units (the "RSUs") at an exchange ratio of 1.082.

F2: Includes (i) 90,629 shares underlying RSUs that vested on the Effective Date in connection with the merger, (ii) 50,432 RSUs that will vest on July 10, 2021; (iii) 20,806 RSUs that will vest on February 14, 2022, (iv) 19,390 RSUs that will vest on February 14, 2022, and (v) 19,391 RSUs that will vest on February 14, 2023, in each case subject to the Reporting Person providing Continuous Service to the Issuer on each such date.

F3: Grant to the Reporting Person of an RSU. Each RSU represents a contingent right to receive one share of common stock of the Issuer. The shares underlying the RSU will vest in full on October 1, 2020, provided the Reporting Person continues to provide services to the Issuer on such vesting date.

F4: 25% of the total number of shares underlying this option vested on February 14, 2019 and the remaining shares were scheduled to vest 1/48 per month over the next 36 months thereafter, subject to continued service to the Issuer through each vesting date. In connection with the merger, vesting was partially accelerated so that on the Effective Date, the Reporting Person immediately vested in that number of shares underlying the option as if he had provided an additional 12 months of continuous service as of the Effective Date. Commencing on April 14, 2021, subject to continuous service, the shares underlying the options will continue to vest 1/48 per month until full vested.

F5: 25% of the total number of shares underlying this option vested on February 14, 2020 and the remaining shares were scheduled to vest 1/48 per month over the next 36 months thereafter, subject to continued service to the Issuer through each vesting date. In connection with the merger, vesting was partially accelerated so that on the Effective Date, the Reporting Person immediately vested in that number of shares underlying the option as if he had provided an additional 12 months of continuous service on the Effective Date. Commencing on April 14, 2021, subject to continuous service, the shares underlying the options will continue to vest 1/48 per month until fully vested.

F6: 25% of the total number of shares underlying this option vested on July 10, 2018 and the remaining shares were scheduled to vest 1/48 per month over the next 36 months thereafter, subject to continued service to the Issuer through each vesting date. In connection with the merger, vesting was partially accelerated so that on the Effective Date, the Reporting Person immediately vested in that number of shares underlying the option as if he had provided an additional 12 months of continuous service as of the Effective Date. Commencing on April 10, 2021, subject to continuous service, the shares underlying the options will continue to vest 1/48 per month until fully vested.

F7: The shares underlying this option are fully vested. 50% of the shares underlying the option are currently exercisable and 50% of the shares underlying the option will be exercisable in September 2020, subject to continued service to the Issuer

Teads Holding Co.

Report date May 13, 2026 · Filed May 18, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeDirect72,500 Reported balance After 2026-05-13 transaction · row 1
1 source row

Row 1 · 2026-05-13 · Grant · Acquired 20,000 · Balance 72,500

F1: Restricted stock units granted pursuant to the Issuer's 2021 Long-Term Incentive Plan which vest in twelve equal increments over a period of three years beginning June 5, 2026, and on each quarterly anniversary thereof.

Filing footnotes · ownership attribution and instrument terms

F1: Restricted stock units granted pursuant to the Issuer's 2021 Long-Term Incentive Plan which vest in twelve equal increments over a period of three years beginning June 5, 2026, and on each quarterly anniversary thereof.

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 137,036 · 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 $3.90 · Expires 2028-02-27Direct0 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 155,650 · 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 3 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 3 · 2020-04-01 · Disposition to issuer · Disposed 67,646 · 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 $2.36 · Expires 2027-07-10Direct0 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 450,000 · 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 $2.36 · Expires 2027-07-10Direct0 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 450,000 · 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.

Restricted Stock UnitSEC Table II · derivative / convertible security · Conversion / exercise price $0.00Direct0 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 93,220 · 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 7 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 7 · 2020-04-01 · Disposition to issuer · Disposed 38,461 · 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 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2020-04-01 · Disposition to issuer · Disposed 53,763 · 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
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 7,802 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 9

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 543,864

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.

F7 · price: Each restricted stock unit was granted on December 19, 2023. 6.25% of the restricted stock units vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

Read SEC document
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 1,112 $10.21 $11,353.52
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 8

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 536,062

F4 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of performance stock units.

Read SEC document
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 2,757 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 7

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 537,174

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.

F6 · price: Each performance stock unit "PSU" was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 6,724 $10.21 $68,652.04
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 6

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 534,417

F2 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 15,219 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 5

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 541,141

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.

F5 · price: Each restricted stock unit was granted on March 13, 2025. 6.25% of the restricted stock units vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 33,517 $10.21 $342,208.57
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 4

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 525,922

F4 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of performance stock units.

Read SEC document
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 60,609 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 3

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 559,439

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 · price: Each performance stock unit was granted on March 13, 2025. 41.67% of the earned shares vested and were settled on the 2026 Vesting Date, and the remainder of the earned shares vest and settle at a rate of 8.33% on each quarterly anniversary of the 2026 Vesting Date.

Read SEC document
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 12,675 $10.21 $129,411.75
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 2

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 498,830

F2 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
March 15, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 22,919 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · nonDerivative · entry 1

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 511,505

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: Each restricted stock unit was granted on March 12, 2026. 8.33% of the restricted stock units vested and were settled on March 15, 2026 (the "2026 Vesting Date"), and the remainder of the restricted stock units vest and settle at a rate of 8.33% on each quarterly anniversary of the 2026 Vesting Date.

Read SEC document
March 12, 2026 Filed Mar 16, 2026 20:10 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 GrantRestricted Stock Units · Derivative 275,000 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000031 · form4.xml · derivative · entry 11

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 275,000

Underlying: Common Stock · 275,000 shares

Expires not disclosed

F8 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F9 · derivative.exercise_date: The restricted stock units were granted on March 12, 2026. 8.33% of the restricted stock units vest and settle on March 15, 2026, and the remainder of the restricted stock units vest and settle at a rate of 8.33% on each quarterly anniversary of the 2026 Vesting Date.

F9 · derivative.expiration_date: The restricted stock units were granted on March 12, 2026. 8.33% of the restricted stock units vest and settle on March 15, 2026, and the remainder of the restricted stock units vest and settle at a rate of 8.33% on each quarterly anniversary of the 2026 Vesting Date.

Read SEC document
March 10, 2026 Filed Mar 12, 2026 20:45 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 GrantPerformance Stock Units · Derivative 145,458 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000029 · form4.xml · derivative · entry 1

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 145,458

Underlying: Common Stock · 145,458 shares

Expires not disclosed

F1 · security: On March 13, 2025, the Reporting Person received a performance stock unit ("PSU") grant of 121,753 units. In light of the performance-based conditions of the award, the award was not reportable under Section 16 until the performance-based conditions were certified by the Issuer's Compensation Committee. Such certification occurred on March 10, 2026, pursuant to which 145,458 shares were earned. 41.67% of the earned shares will vest and settle on March 15, 2026 (the "2026 Vesting Date"), and the remainder of the earned shares will vest at a rate of 8.33% on each quarterly anniversary of the 2026 Vesting Date.

F2 · derivative.exercise_price: Performance stock units convert into common stock on a one-for-one basis.

F1 · derivative.exercise_date: On March 13, 2025, the Reporting Person received a performance stock unit ("PSU") grant of 121,753 units. In light of the performance-based conditions of the award, the award was not reportable under Section 16 until the performance-based conditions were certified by the Issuer's Compensation Committee. Such certification occurred on March 10, 2026, pursuant to which 145,458 shares were earned. 41.67% of the earned shares will vest and settle on March 15, 2026 (the "2026 Vesting Date"), and the remainder of the earned shares will vest at a rate of 8.33% on each quarterly anniversary of the 2026 Vesting Date.

F1 · derivative.expiration_date: On March 13, 2025, the Reporting Person received a performance stock unit ("PSU") grant of 121,753 units. In light of the performance-based conditions of the award, the award was not reportable under Section 16 until the performance-based conditions were certified by the Issuer's Compensation Committee. Such certification occurred on March 10, 2026, pursuant to which 145,458 shares were earned. 41.67% of the earned shares will vest and settle on March 15, 2026 (the "2026 Vesting Date"), and the remainder of the earned shares will vest at a rate of 8.33% on each quarterly anniversary of the 2026 Vesting Date.

Read SEC document
December 31, 2025 Filed Jan 5, 2026 21:08 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 13,476 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000009 · form4.xml · derivative · entry 3

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 148,232

Underlying: Common Stock · 13,476 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: Restricted stock units convert into common stock on a one-for-one basis.

F1 · derivative.exercise_date: Each restricted stock unit was granted on August 19, 2025. 8.33% of the restricted stock units vested and were settled on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

F1 · derivative.expiration_date: Each restricted stock unit was granted on August 19, 2025. 8.33% of the restricted stock units vested and were settled on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

Read SEC document
December 31, 2025 Filed Jan 5, 2026 21:08 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 7,453 $11.44 $85,262.32
Disclosure

SEC source: 0001819928-26-000009 · form4.xml · nonDerivative · entry 2

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 488,586

F2 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
December 31, 2025 Filed Jan 5, 2026 21:08 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 13,476 $0.00 $0.00
Disclosure

SEC source: 0001819928-26-000009 · form4.xml · nonDerivative · entry 1

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 496,039

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: Each restricted stock unit was granted on August 19, 2025. 8.33% of the restricted stock units vested and were settled on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 9,375 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · derivative · entry 14

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,500

Underlying: Common Stock · 9,375 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.

F8 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F10 · shares: As reported previously, vested shares will be delivered to the reporting person as soon as administratively feasible following his separation from service with the Issuer.

F11 · derivative.exercise_date: Each restricted stock unit was granted on December 12, 2022. 6.25% of the restricted stock units vested on March 15, 2023 (the "2023 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2023 Vesting Date.

F11 · derivative.expiration_date: Each restricted stock unit was granted on December 12, 2022. 6.25% of the restricted stock units vested on March 15, 2023 (the "2023 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2023 Vesting Date.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 15,219 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · derivative · entry 13

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 182,628

Underlying: Common Stock · 15,219 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.

F8 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F7 · derivative.exercise_date: Each restricted stock unit was granted on March 13, 2025. 6.25% of the restricted stock units vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

F7 · derivative.expiration_date: Each restricted stock unit was granted on March 13, 2025. 6.25% of the restricted stock units vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionPerformance Stock Units · Derivative 2,756 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · derivative · entry 12

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 11,028

Underlying: Common Stock · 2,756 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.

F9 · derivative.exercise_price: Performance stock units convert into common stock on a one-for-one basis.

F5 · derivative.exercise_date: Each performance stock unit was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

F5 · derivative.expiration_date: Each performance stock unit was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 7,802 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · derivative · entry 11

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,411

Underlying: Common Stock · 7,802 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.

F8 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F4 · derivative.exercise_date: Each restricted stock unit was granted on December 19, 2023. 6.25% of the restricted stock units vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

F4 · derivative.expiration_date: Each restricted stock unit was granted on December 19, 2023. 6.25% of the restricted stock units vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 6,471 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · derivative · entry 10

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 6,471 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.

F8 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F2 · derivative.exercise_date: Each restricted stock unit was granted on December 10, 2021. 6.25% of the restricted stock units vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

F2 · derivative.expiration_date: Each restricted stock unit was granted on December 10, 2021. 6.25% of the restricted stock units vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 8,417 $10.83 $91,156.11
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 9

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 482,563

F3 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 15,219 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 8

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 490,980

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.

F7 · price: Each restricted stock unit was granted on March 13, 2025. 6.25% of the restricted stock units vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 1,525 $10.83 $16,515.75
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 7

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 475,761

F6 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of performance stock units.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 2,756 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 6

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 477,286

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.

F5 · price: Each performance stock unit was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 4,315 $10.83 $46,731.45
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 5

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 474,530

F3 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 7,802 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 4

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 478,845

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.

F4 · price: Each restricted stock unit was granted on December 19, 2023. 6.25% of the restricted stock units vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 3,579 $10.83 $38,760.57
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 3

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 471,043

F3 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
December 15, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 6,471 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 2

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 474,622

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.

F2 · price: Each restricted stock unit was granted on December 10, 2021. 6.25% of the restricted stock units vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

Read SEC document
November 30, 2025 Filed Dec 17, 2025 21:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 OtherCommon Stock 100 $8.96 $896.00
Disclosure

SEC source: 0001819928-25-000034 · form4.xml · nonDerivative · entry 1

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 468,151

F1 · kind: Pursuant to the DoubleVerify Holdings, Inc. 2021 Employee Stock Purchase Plan (ESPP), the purchase price per share reported reflects a discount of 15% of the lesser of the share price at the first day of the offering period or the purchase date.

F1 · price: Pursuant to the DoubleVerify Holdings, Inc. 2021 Employee Stock Purchase Plan (ESPP), the purchase price per share reported reflects a discount of 15% of the lesser of the share price at the first day of the offering period or the purchase date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 9,375 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · derivative · entry 13

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 46,875

Underlying: Common Stock · 9,375 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.

F7 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F9 · shares: As reported previously, vested shares will be delivered to the reporting person as soon as administratively feasible following his separation from service with the Issuer.

F10 · derivative.exercise_date: Each restricted stock unit was granted on December 12, 2022. 6.25% of the restricted stock units vested on March 15, 2023 (the "2023 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2023 Vesting Date.

F10 · derivative.expiration_date: Each restricted stock unit was granted on December 12, 2022. 6.25% of the restricted stock units vested on March 15, 2023 (the "2023 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2023 Vesting Date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 6,471 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · derivative · entry 12

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,471

Underlying: Common Stock · 6,471 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.

F7 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F6 · derivative.exercise_date: Each restricted stock unit was granted on December 10, 2021. 6.25% of the restricted stock units vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

F6 · derivative.expiration_date: Each restricted stock unit was granted on December 10, 2021. 6.25% of the restricted stock units vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 7,802 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · derivative · entry 11

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 70,213

Underlying: Common Stock · 7,802 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.

F7 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F5 · derivative.exercise_date: Each restricted stock unit was granted on December 19, 2023. 6.25% of the restricted stock units vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

F5 · derivative.expiration_date: Each restricted stock unit was granted on December 19, 2023. 6.25% of the restricted stock units vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionPerformance Stock Units · Derivative 2,756 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · derivative · entry 10

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,784

Underlying: Common Stock · 2,756 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.

F8 · derivative.exercise_price: Performance stock units convert into common stock on a one-for-one basis.

F3 · derivative.exercise_date: Each performance stock unit was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

F3 · derivative.expiration_date: Each performance stock unit was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 15,219 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · derivative · entry 9

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 197,847

Underlying: Common Stock · 15,219 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.

F7 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F1 · derivative.exercise_date: Each restricted stock unit was granted on March 13, 2025. 6.25% of the restricted stock units vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

F1 · derivative.expiration_date: Each restricted stock unit was granted on March 13, 2025. 6.25% of the restricted stock units vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 3,579 $13.01 $46,562.79
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · nonDerivative · entry 8

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 468,051

F2 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 6,471 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · nonDerivative · entry 7

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 471,630

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.

F6 · price: Each restricted stock unit was granted on December 10, 2021. 6.25% of the restricted stock units vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 4,315 $13.01 $56,138.15
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · nonDerivative · entry 6

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 465,159

F2 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 7,802 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · nonDerivative · entry 5

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 469,474

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.

F5 · price: Each restricted stock unit was granted on December 19, 2023. 6.25% of the restricted stock units vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 1,525 $13.01 $19,840.25
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · nonDerivative · entry 4

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 461,672

F4 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of performance stock units.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 2,756 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · nonDerivative · entry 3

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 463,197

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 · price: Each performance stock unit was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 8,417 $13.01 $109,505.17
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · nonDerivative · entry 2

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 460,441

F2 · kind: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units.

Read SEC document
September 15, 2025 Filed Sep 17, 2025 20:34 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 15,219 $0.00 $0.00
Disclosure

SEC source: 0001819928-25-000011 · form4.xml · nonDerivative · entry 1

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 468,858

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: Each restricted stock unit was granted on March 13, 2025. 6.25% of the restricted stock units vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

Read SEC document
August 19, 2025 Filed Aug 21, 2025 20:17 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 GrantRestricted Stock Units · Derivative 161,708 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-110669 · ownership.xml · derivative · entry 1

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 161,708

Underlying: Common Stock · 161,708 shares

Expires not disclosed

F1 · security: The restricted stock units were granted on August 19, 2025. 8.33% of the restricted stock units will vest on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

F2 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F1 · shares: The restricted stock units were granted on August 19, 2025. 8.33% of the restricted stock units will vest on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

F1 · derivative.exercise_date: The restricted stock units were granted on August 19, 2025. 8.33% of the restricted stock units will vest on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

F1 · derivative.expiration_date: The restricted stock units were granted on August 19, 2025. 8.33% of the restricted stock units will vest on December 31, 2025 (the "2025 Vesting Date"), and the remainder of the restricted stock units vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date, subject to Mr. Zagorski's continued employment.

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June 15, 2025 Filed Jun 17, 2025 20:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 9,375 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-087389 · ownership.xml · derivative · entry 14

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 56,250

Underlying: Common Stock · 9,375 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.

F10 · derivative.exercise_price: RSUs convert into common stock on a one-for-one basis.

F13 · shares: As reported previously, vested shares will be delivered to the reporting person as soon as administratively feasible following his separation from service with the Issuer.

F12 · derivative.exercise_date: Each RSU was granted on December 12, 2022. 6.25% of the RSUs vested on March 15, 2023 (the "2023 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2023 Vesting Date.

F12 · derivative.expiration_date: Each RSU was granted on December 12, 2022. 6.25% of the RSUs vested on March 15, 2023 (the "2023 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2023 Vesting Date.

F13 · derivative.underlying_shares: As reported previously, vested shares will be delivered to the reporting person as soon as administratively feasible following his separation from service with the Issuer.

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June 15, 2025 Filed Jun 17, 2025 20:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 6,471 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-087389 · ownership.xml · derivative · entry 13

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,942

Underlying: Common Stock · 6,471 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.

F10 · derivative.exercise_price: RSUs convert into common stock on a one-for-one basis.

F8 · derivative.exercise_date: Each RSU was granted on December 10, 2021. 6.25% of the RSUs vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

F8 · derivative.expiration_date: Each RSU was granted on December 10, 2021. 6.25% of the RSUs vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

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June 15, 2025 Filed Jun 17, 2025 20:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 7,802 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-087389 · ownership.xml · derivative · entry 12

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,015

Underlying: Common Stock · 7,802 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.

F10 · derivative.exercise_price: RSUs convert into common stock on a one-for-one basis.

F6 · derivative.exercise_date: Each RSU was granted on December 19, 2023. 6.25% of the RSUs vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

F6 · derivative.expiration_date: Each RSU was granted on December 19, 2023. 6.25% of the RSUs vested and were settled on March 15, 2024 (the "2024 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2024 Vesting Date.

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June 15, 2025 Filed Jun 17, 2025 20:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionPerformance Stock Units · Derivative 2,756 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-087389 · ownership.xml · derivative · entry 11

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,540

Underlying: Common Stock · 2,756 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.

F11 · derivative.exercise_price: PSUs convert into common stock on a one-for-one basis.

F4 · derivative.exercise_date: Each performance stock unit "PSU" was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

F4 · derivative.expiration_date: Each performance stock unit "PSU" was granted on December 19, 2023. 41.67% of the earned shares vested and were settled on the 2025 Vesting Date, and the remainder of the earned shares vest at a rate of 8.33% on each quarterly anniversary of the 2025 Vesting Date.

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June 15, 2025 Filed Jun 17, 2025 20:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionRestricted Stock Units · Derivative 15,220 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-087389 · ownership.xml · derivative · entry 10

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 213,066

Underlying: Common Stock · 15,220 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.

F10 · derivative.exercise_price: RSUs convert into common stock on a one-for-one basis.

F2 · derivative.exercise_date: Each restricted stock unit "RSU" was granted on March 13, 2025. 6.25% of the RSUs vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

F2 · derivative.expiration_date: Each restricted stock unit "RSU" was granted on March 13, 2025. 6.25% of the RSUs vested and were settled on March 15, 2025 (the "2025 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2025 Vesting Date.

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June 15, 2025 Filed Jun 17, 2025 20:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 3,579 $14.50 $51,895.50
Disclosure

SEC source: 0000950170-25-087389 · ownership.xml · nonDerivative · entry 9

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 453,639

F9 · kind: Represents shares withheld to satisfy tax obligations in connection with the vesting of 6,471 RSUs on June 15, 2025.

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June 15, 2025 Filed Jun 17, 2025 20:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Exercise / conversionCommon Stock 6,471 $0.00 $0.00
Disclosure

SEC source: 0000950170-25-087389 · ownership.xml · nonDerivative · entry 8

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 457,218

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.

F8 · price: Each RSU was granted on December 10, 2021. 6.25% of the RSUs vested and were settled on March 15, 2022 (the "2022 Vesting Date"), and the remainder of the RSUs vest at a rate of 6.25% on each quarterly anniversary of the 2022 Vesting Date.

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June 15, 2025 Filed Jun 17, 2025 20:22 UTC DoubleVerify Holdings, Inc. DV · Entity 4486 Tax withholdingCommon Stock 4,315 $14.50 $62,567.50
Disclosure

SEC source: 0000950170-25-087389 · ownership.xml · nonDerivative · entry 7

Zagorski Mark · CIK 0001709574 · Director · Chief Executive Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 450,747

F7 · kind: Represents shares withheld to satisfy tax obligations in connection with the vesting of 7,802 RSUs on June 15, 2025.

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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.