X0508 4 2023-11-14 0 0001819928 DoubleVerify Holdings, Inc. DV 0001853942 Eddleman Julie C/O DOUBLEVERIFY HOLDINGS, INC. 462 BROADWAY NEW YORK NY 10013 0 1 0 0 Global Chief Comm. Officer 1 Common Stock 2023-11-14 4 S 0 750 31.10 D 141306 D Common Stock 2023-11-14 4 S 0 4221 31.3256 D 137085 D The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on March 31, 2022, as amended on March 23, 2023. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $31.325 to $31.335, 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. /s/ Andrew E. Grimmig, as Attorney-in-Fact for Julie F. Eddleman 2023-11-16