X0306 4 2021-11-18 0 0001819928 DoubleVerify Holdings, Inc. DV 0001853874 McLaughlin Matthew F. C/O DOUBLEVERIFY HOLDINGS, INC. 233 SPRING STREET NEW YORK NY 10013 0 1 0 0 Chief Operating Officer Common Stock 2021-11-18 4 M 0 700000 2.01 A 700001 I By Trust Common Stock 2021-11-18 4 F 0 296739 31.4866 D 403262 I By Trust Common Stock 2021-11-18 4 F 0 59005 32.2074 D 344257 I By Trust Common Stock 2021-11-18 4 F 0 35196 32.9994 D 309061 I By Trust Common Stock 2021-11-19 4 M 0 502825 2.01 A 811886 I By Trust Common Stock 2021-11-19 4 F 0 194375 31.9832 D 617511 I By Trust Common Stock 2021-11-19 4 F 0 107320 32.741 D 510191 I By Trust Options (Rights to Buy) 2.01 2021-11-18 4 M 0 700000 0.00 D 2027-09-20 Common Stock 700000 502825 I By Trust Options (Rights to Buy) 2.01 2021-11-19 4 M 0 502825 0.00 D 2027-09-20 Common Stock 502825 0 I By Trust Represents shares and options held by The McLaughlin Family Trust for which Mr. McLaughlin is a trustee. Represents shares disposed to pay the exercise price and satisfy tax obligations in connection with the exercise of 700,000 options on November 18, 2021. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $30.87 to $31.86, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $31.87 to $32.86, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $32.87 to $33.13, 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 shares disposed to pay the exercise price and satisfy tax obligations in connection with the exercise of 502,825 options on November 19, 2021. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $31.40 to $32.39, 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. The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions ranging from $32.40 to $33.20, 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, 25% of which vested on September 20, 2018 and the remainder of which vested at a rate of 6.25% per quarter thereafter, subject to Mr. McLaughlin's continued employment. The options fully vested on September 20, 2021. The total was increased by one share due to an administrative calculation error due to rounding of the vested amount. /s/ Andrew E. Grimmig, as Attorney-in-Fact for Matthew F. McLaughlin 2021-11-22