X0609 4 2026-05-21 0001819928 DoubleVerify Holdings, Inc. DV 0001550028 Desmond Laura false C/O DOUBLEVERIFY HOLDINGS, INC. NEW YORK NY 10013 1 0 Restricted Stock Units 2026-05-21 4 M 0 14609 0 D 2026-05-21 Common Stock 14609 0 I By Trust Restricted Stock Units 2026-05-21 4 A 0 20000 0 A 2027-05-21 Common Stock 20000 20000 I By Trust Restricted stock units convert into common stock on a one-for-one basis. 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, 2027 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 was granted on May 21, 2025 and represents a right to receive one share of common stock on a one-to-one basis. The restricted stock units fully vested on May 21, 2026. Represents restricted stock units held by the Laura B. Desmond Revocable Trust for which Ms. Desmond is trustee. Represents time-based restricted stock units granted on May 21, 2026 pursuant to the annual equity grant under DoubleVerify Holdings, Inc.'s non-employee director compensation program. The restricted stock units vest on the earlier of (i) May 21, 2027 and (ii) the date of DoubleVerify Holdings, Inc.'s 2027 Annual Meeting of Stockholders, subject to the reporting person's continued service. Ms. Desmond made an election under the Issuer's deferred compensation plan to defer delivery of the vested shares upon her end of service as a Director (in which case the shares will be delivered in a lump sum). /s/ Andrew E. Grimmig, as Attorney-in-Fact for Laura B. Desmond 2026-05-22