DV

SEC source: 0001819928-25-000014 · form4.xml · nonDerivative · entry 3

Allais Nicola T · CIK 0001854086 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 111,841

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.

SEC source: 0001819928-25-000014 · form4.xml · nonDerivative · entry 2

Allais Nicola T · CIK 0001854086 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 110,770

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

SEC source: 0001819928-25-000014 · form4.xml · nonDerivative · entry 1

Allais Nicola T · CIK 0001854086 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 114,511

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.

SEC source: 0001819928-25-000012 · form4.xml · derivative · entry 10

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,493

Underlying: Common Stock · 1,493 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.

F6 · 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 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.

F5 · 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.

SEC source: 0001819928-25-000012 · form4.xml · derivative · entry 9

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,500

Underlying: Common Stock · 2,500 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.

F6 · 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 12, 2022. 6.25% of the restricted stock units vested and were settled 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.

F4 · derivative.expiration_date: Each restricted stock unit was granted on December 12, 2022. 6.25% of the restricted stock units vested and were settled 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.

SEC source: 0001819928-25-000012 · form4.xml · derivative · entry 8

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,453

Underlying: Common Stock · 2,384 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.

F6 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F3 · 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.

F3 · 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.

SEC source: 0001819928-25-000012 · form4.xml · derivative · entry 7

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,212

Underlying: Common Stock · 842 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: Performance stock units convert into common stock on a one-for-one basis.

F2 · 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.

F2 · 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.

SEC source: 0001819928-25-000012 · form4.xml · derivative · entry 6

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,949

Underlying: Common Stock · 5,073 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.

F6 · 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.

SEC source: 0001819928-25-000012 · form4.xml · nonDerivative · entry 5

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 100,397

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 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.

SEC source: 0001819928-25-000012 · form4.xml · nonDerivative · entry 4

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 98,904

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 12, 2022. 6.25% of the restricted stock units vested and were settled 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.

SEC source: 0001819928-25-000012 · form4.xml · nonDerivative · entry 3

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 96,404

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 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.

SEC source: 0001819928-25-000012 · form4.xml · nonDerivative · entry 2

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 94,020

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 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.

SEC source: 0001819928-25-000012 · form4.xml · nonDerivative · entry 1

Grimmig Andrew E · CIK 0001854079 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 93,178

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

SEC source: 0000950170-25-114364 · ownership.xml · nonDerivative · entry 2

Dobrin Lucy Stamell · CIK 0001853940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

F2 · shares: The securities reported represent shares of common stock of the Issuer sold by the Reporting Person in a sale in accordance with the requirements of Rule 144 under the Securities Act.

SEC source: 0000950170-25-114364 · ownership.xml · nonDerivative · entry 1

Dobrin Lucy Stamell · CIK 0001853940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,392

F1 · shares: The securities reported represent shares of common stock of DoubleVerify Holdings, Inc. (the "Issuer") received from Providence VII U.S. Holdings L.P. ("Providence VII") pursuant to a pro rata distribution-in-kind on September 9, 2025 to all partners of Providence VII, which distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 11

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Michael J. Dominguez

Disclosed balance after: 115,036

F15 · balance_after: Includes 115,036 shares of common stock of the Issuer received by Michael J. Dominguez in the Distribution-in-Kind and the Butternut Distribution-in-Kind, which distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 10

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By AT 2020 Trust

Disclosed balance after: 2,500

F14 · balance_after: Includes 2,500 shares of common stock of the Issuer received by the AT 2020 Trust, for which Mr. Tisdale is trustee, in the Distribution-in-Kind, which distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 9

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Andrew A. Tisdale

Disclosed balance after: 0

F13 · balance_after: Represents a charitable donation of 47,632 shares of common stock of the Issuer made by Andrew A. Tisdale.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 8

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Andrew A. Tisdale

Disclosed balance after: 47,632

F12 · balance_after: Includes 47,632 shares of common stock of the Issuer received by Andrew A. Tisdale in the Distribution-in-Kind, which distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 7

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By CSC Trustee 2 (Jersey) Limited

Disclosed balance after: 0

F11 · balance_after: The securities reported represent shares of common stock of the Issuer sold by CSC Trustee 2 (Jersey) Limited in a sale in accordance with the requirements of Rule 144 under the Securities Act.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 6

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By CSC Trustee 2 (Jersey) Limited

Disclosed balance after: 396

F10 · balance_after: Includes 396 shares of common stock of the Issuer received by CSC Trustee 2 (Jersey) Limited in the Distribution-in-Kind, which distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 5

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Karim A. Tabet

Disclosed balance after: 0

F9 · balance_after: The securities reported represent shares of common stock of the Issuer sold by Mr. Tabet in a sale in accordance with the requirements of Rule 144 under the Securities Act.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 4

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Karim A. Tabet

Disclosed balance after: 35,749

F8 · balance_after: Includes 35,749 shares of common stock of the Issuer received by Karim A. Tabet in the Distribution-in-Kind and the Butternut Distribution-in-Kind, which distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 3

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By J. David Phillips

Disclosed balance after: 30,720

F7 · balance_after: Includes 30,720 shares of common stock of the Issuer received by J. David Phillips in the Distribution-in-Kind and the Butternut Distribution-in-Kind, which distributions were made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 2

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Indirect · By Providence Butternut Co-Investment L.P.

Disclosed balance after: 117,131

F5 · shares: The securities reported represent shares of common stock of the Issuer disposed of by Providence Butternut Co-Investment L.P. ("Providence Butternut") pursuant to a pro rata distribution-in-kind on September 9, 2025 to all partners of Providence Butternut (the "Butternut Distribution-in-Kind").

F4 · ownership.nature: R. Davis Noell has separately filed a Form 4.

F6 · ownership.nature: R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez may be deemed to exercise voting and investment power over, and thus may be deemed to beneficially own, the securities held by Providence Butternut due to their relationships with Holdco. Each of Providence GP, R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez hereby disclaims beneficial ownership of the shares held by Providence Butternut, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form held by Providence Butternut.

SEC source: 0000950170-25-114362 · ownership.xml · nonDerivative · entry 1

Providence VII U.S. Holdings L.P. · CIK 0001854132 · 10% owner

Providence Equity GP VII-A L.P. · CIK 0001857469 · 10% owner

Providence Butternut Co-Investment L.P. · CIK 0001831271 · 10% owner

Phillips J. David · CIK 0001476657 · 10% owner

Tabet Karim A · CIK 0001857194 · 10% owner

Tisdale Andrew A · CIK 0001857411 · 10% owner

Dominguez Michael J · CIK 0001320307 · 10% owner

Providence Equity Partners L.L.C. · CIK 0001492133 · See Remarks

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,173,777

F1 · shares: The securities reported represent shares of common stock of DoubleVerify Holdings, Inc. (the "Issuer") disposed of by Providence VII U.S. Holdings L.P. ("Providence VII") pursuant to a pro rata distribution-in-kind on September 9, 2025 to all partners of Providence VII (the "Distribution-in-Kind").

F2 · ownership.direct: R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez may be deemed to exercise voting and investment power over, and thus may be deemed to beneficially own, the securities held by Providence VII due to their relationships with Providence Holdco (International) GP Ltd. ("Holdco"). Each of Providence Equity GP VII-A L.P. ("Providence GP"), R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez hereby disclaims beneficial ownership of the shares held by Providence VII, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form held by Providence VII.

F3 · ownership.direct: The securities reported are held directly by Providence VII and may be deemed to be beneficially owned by Providence GP because Providence GP is the general partner of Providence VII. R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez control Holdco, which is the general partner of Providence Fund Holdco (International) L.P. Providence Fund Holdco (International) L.P. is the general partner of PEP VII-A International Ltd., which is the general partner of Providence GP.

F4 · ownership.direct: R. Davis Noell has separately filed a Form 4.

SEC source: 0000950170-25-114363 · ownership.xml · nonDerivative · entry 3

Noell Robert Davis · CIK 0001472786 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 40,658

F7 · balance_after: Includes 40,658 shares of common stock of the Issuer received by R. Noell Davis in the Distribution-in-Kind, which distribution was made in accordance with the exemptions afforded by Rules 16a-13 and 16a-9 of the Securities Exchange Act of 1934, as amended.

SEC source: 0000950170-25-114363 · ownership.xml · nonDerivative · entry 2

Noell Robert Davis · CIK 0001472786 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By Providence Butternut Co-Investment L.P.

Disclosed balance after: 117,131

F5 · shares: The securities reported represent shares of common stock of the Issuer disposed of by Providence Butternut Co-Investment L.P. ("Providence Butternut") pursuant to a pro rata distribution-in-kind on September 9, 2025 made to all partners of Providence Butternut (the "Butternut Distribution-in-Kind").

F4 · ownership.nature: The record and other beneficial owners of the reported securities have separately filed Form 4s.

F6 · ownership.nature: R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez may be deemed to exercise voting and investment power over, and thus may be deemed to beneficially own, the securities held by Providence Butternut due to their relationships with Holdco. Each of Providence GP, R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez hereby disclaims beneficial ownership of the shares held by Providence Butternut, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form as held by Providence Butternut.

SEC source: 0000950170-25-114363 · ownership.xml · nonDerivative · entry 1

Noell Robert Davis · CIK 0001472786 · Director · 10% owner

10b5-1 filing: No plan indicated

Ownership: Indirect · By Providence VII U.S. Holdings L.P.

Disclosed balance after: 18,173,777

F1 · shares: The securities reported represent shares of common stock of DoubleVerify Holdings, Inc. (the "Issuer") disposed of by Providence VII U.S. Holdings L.P. ("Providence VII") pursuant to a pro rata distribution-in-kind on September 9, 2025 to all partners of Providence VII (the "Distribution-in-Kind").

F2 · ownership.nature: R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez may be deemed to exercise voting and investment power over, and thus may be deemed to beneficially own, the securities held by Providence VII due to their relationships with Providence Holdco (International) GP Ltd. ("Holdco"). Each of Providence Equity GP VII-A L.P. ("Providence GP"), R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez hereby disclaims beneficial ownership of the shares held by Providence VII, except to the extent of its or his pecuniary interest therein, and this form shall not be construed as an admission that any such reporting person is the beneficial owner of any of the securities reported on this form as held by Providence VII.

F3 · ownership.nature: The securities reported are held directly by Providence VII and may be deemed to be beneficially owned by Providence GP because Providence GP is the general partner of Providence VII. R. Davis Noell, J. David Phillips, Karim A. Tabet, Andrew A. Tisdale and Michael J. Dominguez control Holdco, which is the general partner of Providence Fund Holdco (International) L.P. Providence Fund Holdco (International) L.P. is the general partner of PEP VII-A International Ltd., which is the general partner of Providence GP.

F4 · ownership.nature: The record and other beneficial owners of the reported securities have separately filed Form 4s.

SEC source: 0000950170-25-113258 · ownership.xml · derivative · entry 2

Desmond Laura · CIK 0001550028 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 0

Underlying: Common Stock · 48,539 shares

Expires 2027-09-20

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 · shares: Represents non-qualified stock options granted on September 20, 2017 that vested on November 22, 2021 upon Providence VII U.S. Holdings L.P. receiving cumulative cash proceeds in respect of its investment in the Issuer equal to two times its aggregate cash investment in the Issuer.

F1 · ownership.nature: Represents shares and options held by the Laura B. Desmond Revocable Trust for which Ms. Desmond is trustee.

SEC source: 0000950170-25-113258 · ownership.xml · nonDerivative · entry 1

Desmond Laura · CIK 0001550028 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By Trust

Disclosed balance after: 223,945

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 · ownership.nature: Represents shares and options held by the Laura B. Desmond Revocable Trust for which Ms. Desmond is trustee.

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.

SEC source: 0000950170-25-087390 · ownership.xml · derivative · entry 16

Eddleman Julie · CIK 0001853942 · Global Chief Comm. Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,982

Underlying: Common Stock · 1,991 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.

F12 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F10 · 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.

F10 · 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.

SEC source: 0000950170-25-087390 · ownership.xml · derivative · entry 15

Eddleman Julie · CIK 0001853942 · Global Chief Comm. Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,622

Underlying: Common Stock · 3,437 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.

F12 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F8 · derivative.exercise_date: Each RSU was granted on December 12, 2022. 6.25% of the RSUs vested and were settled 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.

F8 · derivative.expiration_date: Each RSU was granted on December 12, 2022. 6.25% of the RSUs vested and were settled 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.

SEC source: 0000950170-25-087390 · ownership.xml · derivative · entry 14

Eddleman Julie · CIK 0001853942 · Global Chief Comm. Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 30,340

Underlying: Common Stock · 3,034 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.

F12 · derivative.exercise_price: Restricted stock units 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.

SEC source: 0000950170-25-087390 · ownership.xml · derivative · entry 13

Eddleman Julie · CIK 0001853942 · Global Chief Comm. Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,432

Underlying: Common Stock · 1,072 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.

F13 · 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.

SEC source: 0000950170-25-087390 · ownership.xml · derivative · entry 12

Eddleman Julie · CIK 0001853942 · Global Chief Comm. Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 71,022

Underlying: Common Stock · 5,073 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.

F12 · derivative.exercise_price: Restricted stock units 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.