X0306 4 2023-03-13 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 Common Stock 2023-03-13 4 M 0 40000 6.45 A 94968 D Common Stock 2023-03-13 4 S 0 27144 24.045 D 67824 D Common Stock 2023-03-13 4 S 0 12856 24.7065 D 54968 D Options (Rights to Buy) 6.45 2023-03-13 4 M 0 40000 0.00 D 2030-04-27 Common Stock 40000 401174 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 $23.425 to $24.42, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $24.425 to $24.99, 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. The total was increased by one share due to an administrative calculation error due to rounding of the vested amount. /s/ Andrew E. Grimmig 2023-03-15