X0306 4 2022-09-15 0 0001819928 DoubleVerify Holdings, Inc. DV 0001854079 Grimmig Andrew E C/O DOUBLEVERIFY HOLDINGS, INC. 160 VARICK STREET, SUITE 03-120 NEW YORK NY 10013 0 1 0 0 Chief Legal Officer Common Stock 2022-09-15 4 M 0 1494 0.00 A 55306 D Common Stock 2022-09-15 4 S 0 1700 29.0447 D 53606 D Restricted Stock Units 2022-09-15 4 M 0 1494 0.00 D Common Stock 1494 19411 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 "Vesting Date"), and the remainder of the restricted stock units vest at a rate of 6.25% on each quarterly anniversary of the Vesting Date. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 17, 2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $29.00 to $29.12, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth above. Restricted stock units convert into common stock on a one-for-one basis. /s/ Andrew E. Grimmig 2022-09-19