X0206 3 2024-02-20 1 0001819928 DoubleVerify Holdings, Inc. DV 0001658502 Swidler Gary C/O DOUBLEVERIFY HOLDINGS, INC. 462 BROADWAY NEW YORK NY 10013 1 0 0 0 No securities beneficially owned. Exhibit List: Ex.24 - Power of Attorney /s/ Andrew E. Grimmig, as Attorney-in-Fact for Gary Swidler 2024-02-22