X0306 4 2021-02-22 0 0001671933 Trade Desk, Inc. TTD 0001670811 Paley Eric B C/O THE TRADE DESK, INC. 42 NORTH CHESTNUT STREET VENTURA CA 93001 1 0 0 0 Class A Common Stock 2021-02-22 4 S 0 3500 880.01 D 15596 D Class A Common Stock 8428 I See Footnote Class A Common Stock 4392 I See Footnote The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $880.01 to $880.15, 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 ranges set forth in this footnote. Accounts for a change in direct ownership of 1,096 shares previously owned by the Eric Paley 2018 Annuity Trust (the "2018 Annuity Trust"), which were transferred to the Reporting Person. Represents a change in the form of beneficial ownership in shares previously owned by the Eric Paley 2018 Annuity Trust (the "2018 Annuity Trust"). 8,428 shares held by the 2018 Annuity Trust were previously transferred to the Eric Paley 2015 Remainder Trust (the "2015 Remainder Trust"). The reported securities are owned directly by the Eric Paley 2015 Remainder Trust (the "2015 Remainder Trust"). The reported securities are owned directly by the Eric Paley 2015 Remainder Trust - GST Exempt Share (the "2015 Remainder Trust-Exempt"). /s/ Alfred Palomino - Attorney-In-Fact for Eric B. Paley 2021-02-24