X0508 4 2023-12-26 0 0001819928 DoubleVerify Holdings, Inc. DV 0001550028 Desmond Laura C/O DOUBLEVERIFY HOLDINGS, INC. 462 BROADWAY NEW YORK NY 10013 1 0 0 0 1 Common Stock 2023-12-26 4 M 0 11002 2.01 A 143199 I By Trust Common Stock 2023-12-26 4 S 0 11002 37.3882 D 132197 I By Trust Options (Rights to Buy) 2.01 2023-12-26 4 M 0 11002 0.00 D 2021-11-22 2027-09-20 Common Stock 11002 123539 I By Trust Represents shares and options held by the Laura B. Desmond Revocable Trust for which Ms. Desmond is trustee. The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 30, 2022. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $37.188 to $37.52, 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 September 20, 2017 that vested on November 22, 2021 upon Providence VII U.S. Holdings L.P. receiving cumulative cash proceeds in respect of its investment in the Issuer equal to two times its aggregate cash investment in the Issuer. /s/ Andrew E. Grimmig, as Attorney-in-Fact for Laura B. Desmond 2023-12-28