X0508 4 2023-09-15 0 0001819928 DoubleVerify Holdings, Inc. DV 0001854079 Grimmig Andrew E C/O DOUBLEVERIFY HOLDINGS, INC. 462 BROADWAY NEW YORK NY 10013 0 1 0 0 Chief Legal Officer 0 Common Stock 2023-09-15 4 M 0 1493 0.00 A 60278 D Common Stock 2023-09-15 4 F 0 722 28.92 D 59556 D Restricted Stock Units 2023-09-15 4 M 0 1493 0.00 D Common Stock 1493 13437 D Restricted Stock Units 2023-09-15 4 M 0 2500 0.00 D Common Stock 2500 32500 D The restricted stock units were 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 obligations in connection with the vesting of 1,493 RSUs on September 15, 2023. Restricted stock units convert into common stock on a one-for-one basis. As reported previously, the reporting person made an election under the Issuer's deferred compensation plan to defer delivery of the first four tranches of vested shares until March 2024 or, if sooner, as soon as administratively feasible following his separation from service with the Issuer. The restricted stock units were 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. /s/ Andrew E. Grimmig 2023-09-19