X0407 4 2023-04-13 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 1 Common Stock 2023-04-13 4 M 0 40000 6.45 A 95964 D Common Stock 2023-04-13 4 S 0 40000 30.522 D 55964 D Options (Rights to Buy) 6.45 2023-04-13 4 M 0 40000 0.00 D 2030-04-27 Common Stock 40000 361174 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 22, 2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $30.20 to $30.68, 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. Represents non-qualified stock options granted on April 27, 2020, 25% of which vested on March 30, 2021 and the remainder of which vest at a rate of 6.25% per quarter thereafter, subject to Mr. Grimmig's continued employment. /s/ Andrew E. Grimmig 2023-04-17