144 0001854086 XXXXXXXX LIVE 0001819928 DoubleVerify Holdings, Inc. 001-40349 462 Broadway New York NY 10013 1-212-631-2111 Nicola Allais Other: CFO Common Shares Goldman Sachs & Co. LLC 200 West Street New York NY 10282 31752 968118.48 171714213 04/23/2024 NYSE Common Shares 01/04/2018 Compensation -- Non-Qualified Stock Option Issuer N 31752 01/04/2018 Compensation -- Cashless exercise / same-day sale N Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/26/2024 1764 59010.56 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/19/2024 1764 59419.46 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/18/2024 1788 58542.52 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/26/2024 1764 59105.47 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/25/2024 1764 59045.14 Nicola Allais 462 Broadway New York NY 10013 Common Shares 04/11/2024 1764 59002.27 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/18/2024 1788 58876.34 Nicola Allais 462 Broadway New York NY 10013 Common Shares 04/12/2024 1764 57294.37 Nicola Allais 462 Broadway New York NY 10013 Common Shares 04/11/2024 1764 58970.34 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/18/2024 1788 58499.43 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/19/2024 1764 59051.13 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/26/2024 1764 58927.83 Nicola Allais 462 Broadway New York NY 10013 Common Shares 04/12/2024 1764 57226.81 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/25/2024 1764 59348.37 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/19/2024 1764 59094.88 Nicola Allais 462 Broadway New York NY 10013 Common Shares 03/25/2024 1764 59138.45 Nicola Allais 462 Broadway New York NY 10013 Common Shares 04/12/2024 1764 57619.3 Nicola Allais 462 Broadway New York NY 10013 Common Shares 04/11/2024 1764 58692.16 The sales of shares set forth herein are made in connection with a selling plan dated 11/14/2023 that is intended to comply with Rule 10b5-1(c). The representation below regarding the seller's knowledge of material information was true as of the date the selling plan was entered into. 04/23/2024 11/14/2023 Goldman Sachs & Co. LLC on behalf of Nicola Allais