X0508 4 2026-01-01 0001819928 DoubleVerify Holdings, Inc. DV 0001550028 Desmond Laura C/O DOUBLEVERIFY HOLDINGS, INC. NEW YORK NY 10013 1 0 Common Stock 2026-01-01 4 M 0 10724 0 A 234669 I By Trust As reported previously, the reporting person made an election under the Issuer's deferred compensation plan to defer delivery of the vested shares to the earlier of (i) January 1, 2026 and (ii) the reporting person's end of service as a Director (in which case the shares will be delivered in a lump sum). Each restricted stock unit ("RSU") was granted on May 23, 2024 and represents a right to receive one share of common stock on a one-to-one basis. The RSUs fully vested on May 21, 2025. Represents shares held by the Laura B. Desmond Revocable Trust for which Ms. Desmond is trustee. /s/ Andrew E. Grimmig, as Attorney-in-Fact for Laura B. Desmond 2026-01-05