X0508 4 2025-11-30 0001819928 DoubleVerify Holdings, Inc. DV 0001853942 Eddleman Julie C/O DOUBLEVERIFY HOLDINGS, INC. 462 BROADWAY NEW YORK NY 10013 1 Global Chief Comm. Officer 0 Common Stock 2025-11-30 5 J 0 E 167 8.96 A 217842 D Common Stock 2025-12-15 4 M 0 1991 0 A 219833 D Common Stock 2025-12-15 4 F 0 854 10.83 D 218979 D Common Stock 2025-12-15 4 M 0 3437 0 A 222416 D Common Stock 2025-12-15 4 F 0 1473 10.83 D 220943 D Common Stock 2025-12-15 4 M 0 3034 0 A 223977 D Common Stock 2025-12-15 4 F 0 1301 10.83 D 222676 D Common Stock 2025-12-15 4 M 0 1072 0 A 223748 D Common Stock 2025-12-15 4 F 0 460 10.83 D 223288 D Common Stock 2025-12-15 4 M 0 5073 0 A 228361 D Common Stock 2025-12-15 4 F 0 2174 10.83 D 226187 D Restricted Stock Units 2025-12-15 4 M 0 1991 0 D Common Stock 1991 0 D Restricted Stock Units 2025-12-15 4 M 0 3437 0 D Common Stock 3437 13748 D Restricted Stock Units 2025-12-15 4 M 0 3034 0 D Common Stock 3034 24272 D Performance Stock Units 2025-12-15 4 M 0 1072 0 D Common Stock 1072 4289 D Restricted Stock Units 2025-12-15 4 M 0 5073 0 D Common Stock 5073 60876 D 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. 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. Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units. 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. 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. 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. Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of performance stock units. 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. Restricted stock units convert into common stock on a one-for-one basis. Performance stock units convert into common stock on a one-for-one basis. /s/ Andrew E. Grimmig, as Attorney-in-Fact for Julie F. Eddleman 2025-12-17